Science.gov

Sample records for operations case studies

  1. Describing Elementary Teachers' Operative Systems: A Case Study

    ERIC Educational Resources Information Center

    Dotger, Sharon; McQuitty, Vicki

    2014-01-01

    This case study introduces the notion of an operative system to describe elementary teachers' knowledge and practice. Drawing from complex systems theory, the operative system is defined as the network of knowledge and practices that constituted teachers' work within a lesson study cycle. Data were gathered throughout a lesson study…

  2. C++ and operating systems performance - A case study

    NASA Technical Reports Server (NTRS)

    Russo, Vincent F.; Madany, Peter W.; Campbell, Roy H.

    1990-01-01

    Object-oriented design and programming has many software engineering advantages. Its application to large systems, however, has previously been constrained by performance concerns. The Choices operating system, which has over 75,000 lines of code, is object-oriented and programmed in C++. This paper is a case study of the performance of Choices.

  3. [The anal incontinence-- study on 20 operated cases].

    PubMed

    Iusuf, T; Sârbu, V; Grasa, C; Cristache, C; Botea, F

    2001-01-01

    The authors present 20 cases operated for anal incontinence. Two techniques were performed: direct repair (18 cases) and Musset-Cottrell procedure (2 cases). The results were excellent in 12 cases, good in 5 cases and satisfactory in 3 cases. The method of choice seems to be the direct repair of the anal sphincter after a proper local and general preparation. PMID:12731180

  4. Integrating Nuclear Energy to Oilfield Operations – Two Case Studies

    SciTech Connect

    Eric P. Robertson; Lee O. Nelson; Michael G. McKellar; Anastasia M. Gandrik; Mike W. Patterson

    2011-11-01

    Fossil fuel resources that require large energy inputs for extraction, such as the Canadian oil sands and the Green River oil shale resource in the western USA, could benefit from the use of nuclear power instead of power generated by natural gas combustion. This paper discusses the technical and economic aspects of integrating nuclear energy with oil sands operations and the development of oil shale resources. A high temperature gas reactor (HTGR) that produces heat in the form of high pressure steam (no electricity production) was selected as the nuclear power source for both fossil fuel resources. Both cases were based on 50,000 bbl/day output. The oil sands case was a steam-assisted, gravity-drainage (SAGD) operation located in the Canadian oil sands belt. The oil shale development was an in-situ oil shale retorting operation located in western Colorado, USA. The technical feasibility of the integrating nuclear power was assessed. The economic feasibility of each case was evaluated using a discounted cash flow, rate of return analysis. Integrating an HTGR to both the SAGD oil sands operation and the oil shale development was found to be technically feasible for both cases. In the oil sands case, integrating an HTGR eliminated natural gas combustion and associated CO2 emissions, although there were still some emissions associated with imported electrical power. In the in situ oil shale case, integrating an HTGR reduced CO2 emissions by 88% and increased natural gas production by 100%. Economic viabilities of both nuclear integrated cases were poorer than the non-nuclear-integrated cases when CO2 emissions were not taxed. However, taxing the CO2 emissions had a significant effect on the economics of the non-nuclear base cases, bringing them in line with the economics of the nuclear-integrated cases. As we move toward limiting CO2 emissions, integrating non-CO2-emitting energy sources to the development of energy-intense fossil fuel resources is becoming

  5. Operative treatment of chondroblastoma: a study of 11 cases.

    PubMed

    Hapa, Onur; Karakaşlı, Ahmet; Demirkıran, Nihat Demirhan; Akdeniz, Olcay; Havitçioğlu, Hasan

    2016-03-01

    Aim of the study was to review the radiological, clinical results of 11 chondroblastoma cases treated at our institute between 2003-2013. All patients with chondroblastoma included in this study underwent intra-lesional curettage+/-bone grafting. Follow up for healing of chondroblastoma lesions and detection of any local recurrence was assessed on clinical and radiological bases. The functional outcome was assessed by the Musculoskeletal Tumour Society scoring system. The mean follow-up period was 6.1 years. There were three recurrences (two femoral head, one proximal tibia). The mean Musculoskeletal Tumour Society functional score was 21. First line aggressive treatment seems appropriate for chondroblastoma especially when localized at lower extremities. PMID:26984656

  6. Case study: City of Industry landfill gas recovery operation

    SciTech Connect

    1981-11-01

    Development of civic, recreation, and conservation facilities throughout a 150-acre site which had been used for waste disposal from 1951 to 1970 is described. The history of the landfill site, the geology of the site, and a test well program to assess the feasibility of recoverying landfill gas economically from the site are discussed. Based on results of the test well program, the City of Industry authorized the design and installation of a full-scale landfill gas recovery system. Design, construction, and operation of the system are described. The landfill gas system provides fuel for use in boilers to meet space heating and hot water demands for site development (MCW)

  7. Operational benefits of electronic toll collection: Case study

    SciTech Connect

    Al-Deek, H.M.; Mohamed, A.A.; Radwan, A.E.

    1997-11-01

    This paper reports the improvements in traffic operations at the electronic toll collection plazas of the Orlando-Orange County Expressway Authority. Service time, vehicle arrival times, and departure times, as well as vehicle counts were collected before and after the installation of automatic vehicle identification technology known as E-PASS. The findings indicate that, for the dedicated E-PASS lane, the measured capacity has tripled, the service time has decreased by five seconds per vehicle, the average queuing delay has decreased by one minute per vehicle, the maximum queuing delay has decreased by 2.5--3 minutes per vehicle, and the total queuing delay has decreased by 8.5--9.5 vehicle-hours per morning peak hour for that lane. Also, variability in the headway has been reduced significantly in the dedicated E-PASS lane. Capacity, headway, and service times of the mixed (manual/E-PASS or automatic/E-PASS) lanes did not change significantly. However, arrivals have shifted to the dedicated E-PASS lanes, thus reducing delays at the mixed lanes and improving traffic operations for the entire toll plaza.

  8. Tender mooring for infill drilling operations: A case study

    SciTech Connect

    1997-04-01

    The Tapis-pump platform is a four-leg jacket structure located 230 ft south of the Tapis-D platform and connected to it by a walkway bridge. All crude production (360,000 B/D) from Esso Production Malaysia Inc. (EPMI) wells in the South China Sea offshore Terengganu is piped to the Tapais-pump platform for pumping to an onshore terminal. The continuous operation of this platform is essential. The Tapis-D platform is a manned production platform that also acts as a central communication center and emergency response command center for EPMI`s offshore operations in the South China Sea. A total of nine wells is planned for an infill drilling program at the Tapis-D platform. The rig selected for this infill drilling program is a self-erecting tender-assisted rig that uses an eight-point wire rope mooring system. Eleven pipelines are connected to the Tapis-pump/Tapis-D platform complex. All the pipelines were laid on the seafloor without any special external protection and were not tied down or anchored. The paper describes the planning of the mooring system for drilling.

  9. Exploring Pre-Operational and Concrete Operational Children's Thinking on Nutrition: A Case Study

    ERIC Educational Resources Information Center

    Brouse, Corey H.; Chow, Tracy H. F.

    2009-01-01

    Objective: In this exploratory study, we observed the process in which children make food choices from a cognitive development perspective and the implications that these choices have on the areas of cognitive development and health and nutrition education. Design: This was a cross-sectional case study that involved an in-depth examination of the…

  10. Technology Solutions Case Study: Hydronic Systems: Designing for Setback Operation

    SciTech Connect

    2014-05-01

    For years, conventional wisdom surrounding space heating has specified two points: size the mechanical systems to the heating loads, and setting the thermostat back at night will result in energy savings. The problem is these two recommendations oppose each other. A system that is properly sized to the heating load will not have the extra capacity necessary to recover from a thermostat setback, especially at design conditions. Properly designing a hydronic system for setback operation can be accomplished but depends on several factors. Determining the appropriateness of setback for a particular project is the first step. This is followed by proper sizing of the boiler and baseboard to ensure the needed capacity can be met. Finally, control settings must be chosen that result in the most efficient and responsive performance. This guide provides step-by-step instructions for heating contractors and hydronic designers for selecting the proper control settings to maximize system performance and improve response time when using a thermostat setback.

  11. Hexavalent chromium emissions from aerospace operations: A case study

    SciTech Connect

    Chaurushia, A.; Bajza, C.

    1994-12-31

    Northrop Aircraft Division (NAD) is subject to several air toxic regulations such as EPA SARA Title 3, California Assembly Bill 2588 (AB2588), and Proposition 65 and is a voluntary participant in air toxic emissions reduction programs such as the EPA 33/50 and MERIT Program. To quantify emissions, NAD initially followed regulatory guidelines which recommend that emission inventories of air toxics be based on engineering assumptions and conservative emission factors in absence of specific source test data. NAD was concerned that Chromium VI emissions from NAD`s spray coating and chemical tank line operations were not representative due to these techniques. More recently, NAD has relied upon information from its ongoing source testing program to determine emission rates of Chromium VI. Based on these source test results, NAD revised emission calculations for use in Chromium VI inventories, impact assessments and control strategies. NAD has been successful in demonstrating a significant difference between emissions calculated utilizing the source test results and emissions based on the traditional mass balance using agency suggested methods.

  12. Bulb turbine operating at medium head: XIA JIANG case study

    NASA Astrophysics Data System (ADS)

    Loiseau, F.; Desrats, C.; Petit, P.; Liu, J.

    2012-11-01

    With lots of references for 4-blade bulb turbines, such as these of Wu Jin Xia (4 units - 36.1 MW per unit - 9.2 m rated head), Chang Zhou (15 units - 46.7 MW per unit - 9.5 m rated head) and Tong Wan (4 units - 46.2 MW per unit - 11 m rated head), ALSTOM Power Hydro is one of the major suppliers of bulb turbines operating under medium head for the Chinese market. ALSTOM Power Hydro has been awarded in November 2010 a contract by Jiang Xi Province Xia Jiang Water Control Project Headquarters to equip Xia Jiang's new hydropower plant. The power dam is located on the Gan Jiang river, at about 160 km away from Nan Chang town in South Eastern China. The supply will consist in 5 bulb units including the furniture of both the turbine and its generator, for a total capacity of 200 MW, under a rated net head of 8.6 m. The prototype turbine is a 7.8 m diameter runner, rotating at 71.4 rpm speed. For this project, ALSTOM has proposed a fully new design of 4-blade bulb runner. This paper outlines the main steps of the hydraulic development. First of all, a fine tuning of the blade geometry was performed to enhance the runner behaviour at high loads and low heads, so that to fulfill the demanding requirements of efficiencies and maximum output. The challenge was also to keep an excellent cavitation behaviour, especially at the outer blade diameter in order to avoid cavitation erosion on the prototype. The shape of the blade was optimized by using the latest tools in computational fluid dynamics. Steady state simulations of the distributor and the runner were performed, in order to simulate more accurately the pressure fields on the blade and the velocity distribution at the outlet of the runner. Moreover, draft tube computations have been performed close to the design point and at higher loads. Then, a model fully homologous with the prototype was manufactured and tested at ALSTOM's laboratory in Grenoble (France). The model test results confirmed the predicted ones: the

  13. Electronic Performance Support for Operational Systems: A Case Study of the Link Monitor and Control Operator Assistant

    NASA Technical Reports Server (NTRS)

    Hill, Randall W., Jr.; Cooper, Lynne P.

    1993-01-01

    For complex operational systems, help needs to come from the inside out. It is often not realistic to call a help desk for problems that need immediate attention, especially for tasks that put a heavy cognitive load on the system operator. This session addresses the issues associated with providing electronic performance support for operational systems, including situations where the system is already fielded and can only change through evolution rather than revolution. We present a case study based on our experiences in developing the Link Monitor and Control Operator Assistant for NASA's Deep Space Network (DSN). The goals of the Operator Assistant are to improve the operability of the system and increase the efficiency of mission operations.

  14. Use of the LITEE Lorn Manufacturing Case Study in a Senior Chemical Engineering Unit Operations Laboratory

    ERIC Educational Resources Information Center

    Abraham, Nithin Susan; Abulencia, James Patrick

    2011-01-01

    This study focuses on the effectiveness of incorporating the Laboratory for Innovative Technology and Engineering Education (LITEE) Lorn Manufacturing case into a senior level chemical engineering unit operations course at Manhattan College. The purpose of using the case study is to demonstrate the relevance of ethics to chemical engineering…

  15. A pre- and post-operative study of forty-six cases of slipped intervertebral disc

    PubMed Central

    Harto-Garofalidis, G.; Papavassiliou, N.; Rigopoulos, Ch.; Papathanassiou, B. T.

    1968-01-01

    The results of operation on 46 cases of slipped disc have been studied. The age of the patient and the duration of pre-operative symptoms both influence the late results. Results were not usually satisfactory in cases with severe limitation of straight-leg raising. Severe pressure on the nerve-root produces permanent changes and symptoms do not always disappear after its relief. The presence of degenerative changes, visible on the radiograph, is associated with poor late results. Tears of the posterior longitudinal ligament are associated with satisfactory late results. In the majority of cases, the early and late results were similar. PMID:5644993

  16. Case Studies on the Impact of Concentrated Animal Feeding Operations (CAFOs) on Ground Water Quality

    EPA Science Inventory

    This report describes a series of case studies involving commercial swine, poultry, dairy, and beef CAFO operations where ground water contamination by nitrate and ammonia has occurred to ascertain whether other stressors in CAFO wastes are also being transported through the vado...

  17. Operational effectiveness and quality assurance mechanisms with stochastic demand of blood supply: blood bank case study.

    PubMed

    Smith, Alan D

    2011-01-01

    A general overview of various blood products operational effectiveness and related strategies that can be utilised by service providers (in particular, healthcare providers) is presented in the present study. In terms of the massive volumes of blood products, the North American blood centres collect more than eight million units of whole blood, which represents appropriately 50% of the US and Quebec, Canada?s volunteer donor blood supply. A case study of the quality inspection and inventory control concerns of the Central Blood Bank, located in the metropolitan area of Pittsburgh, PA, is presented. Initially, brief introduction to its general operating environment is followed by sections describing its general situation, quality-service initiatives, and followed by a fairly detailed discussion of the practical applications of lessons learned from the case study. PMID:22189177

  18. Communicating for Climate Change Adaptation: Lessons from a Case Study with Nature-Based Tour Operators

    NASA Astrophysics Data System (ADS)

    Timm, K.; Sparrow, E. B.; Pettit, E. C.; Trainor, S. F.; Taylor, K.

    2014-12-01

    Increasing temperatures are projected to have a positive effect on the length of Alaska's tourism season, but the natural attractions that tourism relies on, such as glaciers, wildlife, fish, or other natural resources, may change. In order to continue to derive benefits from these resources, nature-based tour operators may have to adapt to these changes, and communication is an essential, but poorly understood, component of the climate change adaptation process. The goal of this study was to determine how to provide useful climate change information to nature-based tour operators by answering the following questions: 1. What environmental changes do nature-based tour operators perceive? 2. How are nature-based tour operators responding to climate and environmental change? 3. What climate change information do nature-based tour operators need? To answer these questions, twenty-four nature-based tour operators representing 20 different small and medium sized businesses in Juneau, Alaska were interviewed. The results show that many of Juneau's nature-based tour operators are observing, responding to, and in some cases, actively planning for further changes in the environment. The types of responses tended to vary depending on the participants' certainty in climate change and the perceived risks to their organization. Using these two factors, this study proposes a framework to classify climate change responses for the purpose of generating meaningful information and communication processes that promote adaptation and build adaptive capacity. During the course of the study, several other valuable lessons were learned about communicating about adaptation. The results of this study demonstrate that science communication research has an important place in the practice of promoting and fostering climate change adaptation. While the focus of this study was tour operators, the lessons learned may be valuable to other organizations striving to engage unique groups in climate

  19. Human Spaceflight Trajectory Operations: A Case Study from STS-132/ULF4

    NASA Technical Reports Server (NTRS)

    Cutri-Kohart, Rebecca; Browns, Ansley

    2010-01-01

    Prior to the launch of the STS-132/ULF4 mission, the International Space Station (ISS) Flight Control Team was alerted to the approach of a space debris with a predicted time of closest approach approximately 1 hr after Space Shuttle docking. As a result, the ISS team considered performing a collision avoidance maneuver prior to the Space Shuttle s approach. The purpose of this presentation will be to use this case study to illustrate best practices of the human spaceflight trajectory operations team. The presentation will begin with an overview of the roles of the real-time ISS and Space Shuttle trajectory flight control teams. Then, the STS-132/ULF4 case study will be used to illustrate the issues and lessons learned involved in performing Space Shuttle rendezvous maneuver planning and execution. Specific elements of the STS-132 Space Shuttle rendezvous maneuver profile that can be used to provide mission assurance in cases of trajectory uncertainty will be described and discussed. Additionally, this case study will be used to provide context for identifying lessons learned in an operational environment that requires technical and decision-making coordination between two control center teams with two potentially maneuvering space vehicles.

  20. Relay chatter and operator response after a large earthquake: An improved PRA methodology with case studies

    SciTech Connect

    Budnitz, R.J.; Lambert, H.E.; Hill, E.E.

    1987-08-01

    The purpose of this project has been to develop and demonstrate improvements in the PRA methodology used for analyzing earthquake-induced accidents at nuclear power reactors. Specifically, the project addresses methodological weaknesses in the PRA systems analysis used for studying post-earthquake relay chatter and for quantifying human response under high stress. An improved PRA methodology for relay-chatter analysis is developed, and its use is demonstrated through analysis of the Zion-1 and LaSalle-2 reactors as case studies. This demonstration analysis is intended to show that the methodology can be applied in actual cases, and the numerical values of core-damage frequency are not realistic. The analysis relies on SSMRP-based methodologies and data bases. For both Zion-1 and LaSalle-2, assuming that loss of offsite power (LOSP) occurs after a large earthquake and that there are no operator recovery actions, the analysis finds very many combinations (Boolean minimal cut sets) involving chatter of three or four relays and/or pressure switch contacts. The analysis finds that the number of min-cut-set combinations is so large that there is a very high likelihood (of the order of unity) that at least one combination will occur after earthquake-caused LOSP. This conclusion depends in detail on the fragility curves and response assumptions used for chatter. Core-damage frequencies are calculated, but they are probably pessimistic because assuming zero credit for operator recovery is pessimistic. The project has also developed an improved PRA methodology for quantifying operator error under high-stress conditions such as after a large earthquake. Single-operator and multiple-operator error rates are developed, and a case study involving an 8-step procedure (establishing feed-and-bleed in a PWR after an earthquake-initiated accident) is used to demonstrate the methodology.

  1. Opportunities for sustainable design and operation of cleanspaces: A case study on minienvironment system performance

    SciTech Connect

    Xu, Tengfang

    2005-05-01

    In order to identify and pursue energy efficiency opportunities associated with cleanrooms, it is necessary to understand the design and operation of cleanroom systems for specific contamination control requirements. With the industrial trend toward more stringent cleanliness class and tightening clean spaces, it is vital to understand the design of minienvironment and the operational performance of its systems. A good understanding of such system performance would help to identify opportunities in efficient energy end-use and wise allocation of resources associated with processes or productions that require minienvironments and cleanrooms. This report summarizes a case study on energy performance of a common minienvironment used in semiconductor industry, and discusses the opportunities in saving energy, in particular, the opportunities in achieving efficient operation and design that entails applications of minienvironments.

  2. Expert system development methodology and the transition from prototyping to operations: FIESTA, a case study

    NASA Technical Reports Server (NTRS)

    Happell, Nadine; Miksell, Steve; Carlisle, Candace

    1989-01-01

    A major barrier in taking expert systems from prototype to operational status involves instilling end user confidence in the operational system. The software of different life cycle models is examined and the advantages and disadvantages of each when applied to expert system development are explored. The Fault Isolation Expert System for Tracking and data relay satellite system Applications (FIESTA) is presented as a case study of development of an expert system. The end user confidence necessary for operational use of this system is accentuated by the fact that it will handle real-time data in a secure environment, allowing little tolerance for errors. How FIESTA is dealing with transition problems as it moves from an off-line standalone prototype to an on-line real-time system is discussed.

  3. Integrating Solar PV in Utility System Operations: Analytical Framework and Arizona Case Study

    SciTech Connect

    Wu, Jing; Botterud, Audun; Mills, Andrew; Zhou, Zhi; Hodge, Bri-Mathias; Mike, Heaney

    2015-06-01

    A systematic framework is proposed to estimate the impact on operating costs due to uncertainty and variability in renewable resources. The framework quantifies the integration costs associated with subhourly variability and uncertainty as well as day-ahead forecasting errors in solar PV (photovoltaics) power. A case study illustrates how changes in system operations may affect these costs for a utility in the southwestern United States (Arizona Public Service Company). We conduct an extensive sensitivity analysis under different assumptions about balancing reserves, system flexibility, fuel prices, and forecasting errors. We find that high solar PV penetrations may lead to operational challenges, particularly during low-load and high solar periods. Increased system flexibility is essential for minimizing integration costs and maintaining reliability. In a set of sensitivity cases where such flexibility is provided, in part, by flexible operations of nuclear power plants, the estimated integration costs vary between $1.0 and $4.4/MWh-PV for a PV penetration level of 17%. The integration costs are primarily due to higher needs for hour-ahead balancing reserves to address the increased sub-hourly variability and uncertainty in the PV resource. (C) 2015 Elsevier Ltd. All rights reserved.

  4. Exploring Operational Test and Evaluation of Unmanned Aircraft Systems: A Qualitative Case Study

    NASA Astrophysics Data System (ADS)

    Saliceti, Jose A.

    The purpose of this qualitative case study was to explore and identify strategies that may potentially remedy operational test and evaluation procedures used to evaluate Unmanned Aircraft Systems (UAS) technology. The sample for analysis consisted of organizations testing and evaluating UASs (e.g., U.S. Air Force, U.S. Navy, U.S. Army, U.S. Marine Corps, U.S. Coast Guard, and Customs Border Protection). A purposeful sampling technique was used to select 15 subject matter experts in the field of operational test and evaluation of UASs. A questionnaire was provided to participants to construct a descriptive and robust research. Analysis of responses revealed themes related to each research question. Findings revealed operational testers utilized requirements documents to extrapolate measures for testing UAS technology and develop critical operational issues. The requirements documents were (a) developed without the contribution of stakeholders and operational testers, (b) developed with vague or unrealistic measures, and (c) developed without a systematic method to derive requirements from mission tasks. Four approaches are recommended to develop testable operational requirements and assist operational testers: (a) use a mission task analysis tool to derive requirements for mission essential tasks for the system, (b) exercise collaboration among stakeholders and testers to ensure testable operational requirements based on mission tasks, (c) ensure testable measures are used in requirements documents, and (d) create a repository list of critical operational issues by mission areas. The preparation of operational test and evaluation processes for UAS technology is not uniform across testers. The processes in place are not standardized, thus test plan preparation and reporting are different among participants. A standard method to prepare and report UAS technology should be used when preparing and reporting on UAS technology. Using a systematic process, such as mission

  5. Case studies of energy information systems and related technology: Operational practices, costs, and benefits

    SciTech Connect

    Motegi, Naoya; Piette, Mary Ann; Kinney, Satkartar; Dewey, Jim

    2003-09-02

    Energy Information Systems (EIS), which can monitor and analyze building energy consumption and related data throughout the Internet, have been increasing in use over the last decade. Though EIS developers describe the capabilities, costs, and benefits of EIS, many of these descriptions are idealized and often insufficient for potential users to evaluate cost, benefit and operational usefulness. LBNL has conducted a series of case studies of existing EIS and related technology installations. This study explored the following questions: (1) How is the EIS used in day-to-day operation? (2) What are the costs and benefits of an EIS? (3) Where do the energy savings come from? This paper reviews the process of these technologies from installation through energy management practice. The study is based on interviews with operators and energy managers who use EIS. Analysis of energy data trended by EIS and utility bills was also conducted to measure the benefit. This paper explores common uses and findings to identify energy savings attributable to EIS, and discusses non-energy benefits as well. This paper also addresses technologies related to EIS that have been demonstrated and evaluated by LBNL.

  6. Impact of Water Availability on Regional Power System Operations - A Case Study of ERCOT

    NASA Astrophysics Data System (ADS)

    Levin, T.; Zhou, Z.

    2015-12-01

    Impact of water availability on regional power system operations - A case study of ERCOT Thermal power plants are the largest single source of water withdrawals in the United States, mainly for cooling purposes. The amount of water that is required for cooling is highly dependent on a number of factors including the generation technologies being used, the temperature of the input water, and the total electricity load in the system. During summer months, many of these factors coincide to greatly increase the demand for water in a power system. Electricity demand typically reaches its annual peak when temperatures are high due to increased air conditioning loads. Ambient water temperatures also increase, meaning that greater quantities of water are required to provide the same amount of cooling at thermal generation plants. Finally, water availability is generally constrained due to seasonal effects and potential droughts. This raises concerns that water scarcity may lead to forced de-rating at some power plants during periods of peak demand, resulting in a more vulnerable and less reliable energy system. While increasing attention has recently been given to the inexorable link between water and energy, most commercial power models do not explicitly account for water use when optimizing system operation. We apply the AURORAxmp power modeling software to a case study analysis of the ERCOT power system to determine the water requirements of the system during periods of peak power demand. We then analyze water availability by location and time to identify potential supply shortages, which may reduce actual power generation availability. These data are fed back into the power systems model and specific generation units are de-rated as necessitated by water constraints. We then analyze these results to determine how the optimal generation mix, system reliability, and wholesale electricity prices may be affected by when the ERCOT power system is operated under water

  7. The Value of SysML Modeling During System Operations: A Case Study

    NASA Technical Reports Server (NTRS)

    Dutenhoffer, Chelsea; Tirona, Joseph

    2013-01-01

    System models are often touted as engineering tools that promote better understanding of systems, but these models are typically created during system design. The Ground Data System (GDS) team for the Dawn spacecraft took on a case study to see if benefits could be achieved by starting a model of a system already in operations. This paper focuses on the four steps the team undertook in modeling the Dawn GDS: defining a model structure, populating model elements, verifying that the model represented reality, and using the model to answer system-level questions and simplify day-to-day tasks. Throughout this paper the team outlines our thought processes and the system insights the model provided.

  8. Modeling the operational risk in Iranian commercial banks: case study of a private bank

    NASA Astrophysics Data System (ADS)

    Momen, Omid; Kimiagari, Alimohammad; Noorbakhsh, Eaman

    2012-08-01

    The Basel Committee on Banking Supervision from the Bank for International Settlement classifies banking risks into three main categories including credit risk, market risk, and operational risk. The focus of this study is on the operational risk measurement in Iranian banks. Therefore, issues arising when trying to implement operational risk models in Iran are discussed, and then, some solutions are recommended. Moreover, all steps of operational risk measurement based on Loss Distribution Approach with Iran's specific modifications are presented. We employed the approach of this study to model the operational risk of an Iranian private bank. The results are quite reasonable, comparing the scale of bank and other risk categories.

  9. A case study in programming a quantum annealer for hard operational planning problems

    NASA Astrophysics Data System (ADS)

    Rieffel, Eleanor G.; Venturelli, Davide; O'Gorman, Bryan; Do, Minh B.; Prystay, Elicia M.; Smelyanskiy, Vadim N.

    2015-01-01

    We report on a case study in programming an early quantum annealer to attack optimization problems related to operational planning. While a number of studies have looked at the performance of quantum annealers on problems native to their architecture, and others have examined performance of select problems stemming from an application area, ours is one of the first studies of a quantum annealer's performance on parametrized families of hard problems from a practical domain. We explore two different general mappings of planning problems to quadratic unconstrained binary optimization (QUBO) problems, and apply them to two parametrized families of planning problems, navigation-type and scheduling-type. We also examine two more compact, but problem-type specific, mappings to QUBO, one for the navigation-type planning problems and one for the scheduling-type planning problems. We study embedding properties and parameter setting and examine their effect on the efficiency with which the quantum annealer solves these problems. From these results, we derive insights useful for the programming and design of future quantum annealers: problem choice, the mapping used, the properties of the embedding, and the annealing profile all matter, each significantly affecting the performance.

  10. A Case Study: The Operation of Nonpublic Schools from the Perspective of Nonpublic School Staff Members

    ERIC Educational Resources Information Center

    Shepard, Ka'Nessia S.

    2012-01-01

    The descriptive qualitative case study examined the resources nonpublic school staff members used to manage severe maladaptive behaviors and to facilitate the reintegration of students with severe maladaptive behaviors into public schools. The case study involved the participation of 17 nonpublic school staff members in semi-structured…

  11. The dependence of the risk of research reactors from their operating schedule--a case study.

    PubMed

    Kollas, J G

    1991-06-01

    The dependence of the radiological consequences of the "Demokritos" research reactor on the operating schedule of the reactor is assessed in this paper. The 5 MW reactor is located within the limits of Athens city, a large population center with over 3 million inhabitants. The consequences examined would be due to the occurrence of a postulated accident, a 20% core melt loss of coolant accident, that is also considered as the design basis accident of the reactor. Three operating schedules are taken into account: (a) a continuous operation schedule; (b) a 16 hr/day, 5 days/week schedule; and (c) the present 8 hr/day, 5 days/week operating schedule. The assessment of the source term emerges from a conservative estimation of fission product releases to the reactor operating floor, and further under the conservative assumptions of no filter mitigation, and a ground release to the environment. The results of the analysis indicate that there is a direct relation between consequences and duration of operation, the former becoming appreciable as the continuous operation limit is approached. In all cases examined, the thyroid dose and the latent thyroid health effects would be the limiting consequences. PMID:1876720

  12. Environmental Impacts of Metal Cladding Operations and Remedial Measures: A Case Study

    NASA Astrophysics Data System (ADS)

    Roy, P. P.; Sawmliana, C.; Singh, R. K.

    2014-04-01

    In metal cladding operations, a mixture of 11 % TNT flakes, 44 % ammonium nitrate (non-explosive) and 45 % dehydrated salt (non-explosive) are mixed uniformly to produce an explosive mixture with velocity of detonation 1,800-2,000 m/s. To study the environmental impacts of such operations which led to serious complaints from neighbouring villagers and even closure of some units, a study was carried out to investigate the levels of ground vibration, air overpressure and noise generated by blasting operations of different explosive charge quantities during the metal cladding operations and their impacts on the surrounding villages. Following the safety norms of Central Pollution Control Board (CPCB, Model Rules of the Factories Act on Noise Pollution Control) [1] and Directorate General of Mines Safety (DGMS, Damage to the structures due to blast induced ground vibration in the mining areas) [2] of India, generalised guidelines for such safe operations were framed. This paper describes the operational aspects of metal cladding, experimental results and scientific analyses of data to propose certain guidelines for safe metal cladding operations.

  13. Operational value of ensemble streamflow forecasts for hydropower production: A Canadian case study

    NASA Astrophysics Data System (ADS)

    Boucher, Marie-Amélie; Tremblay, Denis; Luc, Perreault; François, Anctil

    2010-05-01

    Ensemble and probabilistic forecasts have many advantages over deterministic ones, both in meteorology and hydrology (e.g. Krzysztofowicz, 2001). Mainly, they inform the user on the uncertainty linked to the forecast. It has been brought to attention that such additional information could lead to improved decision making (e.g. Wilks and Hamill, 1995; Mylne, 2002; Roulin, 2007), but very few studies concentrate on operational situations involving the use of such forecasts. In addition, many authors have demonstrated that ensemble forecasts outperform deterministic forecasts in terms of performance (e.g. Jaun et al., 2005; Velazquez et al., 2009; Laio and Tamea, 2007). However, such performance is mostly assessed on the basis of numerical scoring rules, which compare the forecasts to the observations, and seldom in terms of management gains. The proposed case study adopts an operational point of view, on the basis that a novel forecasting system has value only if it leads to increase monetary and societal gains (e.g. Murphy, 1994; Laio and Tamea, 2007). More specifically, Environment Canada operational ensemble precipitation forecasts are used to drive the HYDROTEL distributed hydrological model (Fortin et al., 1995), calibrated on the Gatineau watershed located in Québec, Canada. The resulting hydrological ensemble forecasts are then incorporated into Hydro-Québec SOHO stochastic management optimization tool that automatically search for optimal operation decisions for the all reservoirs and hydropower plants located on the basin. The timeline of the study is the fall season of year 2003. This period is especially relevant because of high precipitations that nearly caused a major spill, and forced the preventive evacuation of a portion of the population located near one of the dams. We show that the use of the ensemble forecasts would have reduced the occurrence of spills and flooding, which is of particular importance for dams located in populous area, and

  14. Operational value of ensemble streamflow forecasts for hydropower production: A Canadian case study

    NASA Astrophysics Data System (ADS)

    Boucher, Marie-Amélie; Tremblay, Denis; Luc, Perreault; François, Anctil

    2010-05-01

    Ensemble and probabilistic forecasts have many advantages over deterministic ones, both in meteorology and hydrology (e.g. Krzysztofowicz, 2001). Mainly, they inform the user on the uncertainty linked to the forecast. It has been brought to attention that such additional information could lead to improved decision making (e.g. Wilks and Hamill, 1995; Mylne, 2002; Roulin, 2007), but very few studies concentrate on operational situations involving the use of such forecasts. In addition, many authors have demonstrated that ensemble forecasts outperform deterministic forecasts in terms of performance (e.g. Jaun et al., 2005; Velazquez et al., 2009; Laio and Tamea, 2007). However, such performance is mostly assessed on the basis of numerical scoring rules, which compare the forecasts to the observations, and seldom in terms of management gains. The proposed case study adopts an operational point of view, on the basis that a novel forecasting system has value only if it leads to increase monetary and societal gains (e.g. Murphy, 1994; Laio and Tamea, 2007). More specifically, Environment Canada operational ensemble precipitation forecasts are used to drive the HYDROTEL distributed hydrological model (Fortin et al., 1995), calibrated on the Gatineau watershed located in Québec, Canada. The resulting hydrological ensemble forecasts are then incorporated into Hydro-Québec SOHO stochastic management optimization tool that automatically search for optimal operation decisions for the all reservoirs and hydropower plants located on the basin. The timeline of the study is the fall season of year 2003. This period is especially relevant because of high precipitations that nearly caused a major spill, and forced the preventive evacuation of a portion of the population located near one of the dams. We show that the use of the ensemble forecasts would have reduced the occurrence of spills and flooding, which is of particular importance for dams located in populous area, and

  15. Promoting operational research through fellowships: a case study from the South-East Asia Union Office

    PubMed Central

    Satyanarayana, S.; Berger, S. Dar; Chadha, S. S.; Singh, R. J.; Lal, P.; Tonsing, J.; Harries, A. D.

    2015-01-01

    In 2009, the International Union Against Tuberculosis and Lung Disease (The Union) and Médecins Sans Frontières (MSF) jointly developed a new paradigm for operational research (OR) capacity building and started a new process of appointing and supporting OR fellows in the field. This case study describes 1) the appointment of two OR fellows in The Union South-East Asia Office (USEA), New Delhi, India; 2) how this led to the development of an OR unit in that organisation; 3) achievements over the 5-year period from June 2009 to June 2014; and 4) challenges and lessons learnt. In June 2009, the first OR fellow in India was appointed on a full-time basis and the second was appointed in February 2012—both had limited previous experience in OR. From 2009 to 2014, annual research output and capacity building initiatives rose exponentially, and included 1) facilitation at 61 OR training courses/modules; 2) publication of 96 papers, several of which had a lasting impact on national policy and practice; 3) providing technical assistance in promoting OR; 4) building the capacity of medical college professionals in data management; 5) support to programme staff for disseminating their research findings; 6) reviewing 28 scientific papers for national or international peer-reviewed journals; and 7) developing 45 scientific abstracts for presentation at national and international conferences. The reasons for this success are highlighted along with ongoing challenges. This experience from India provides good evidence for promoting similar models elsewhere. PMID:26400596

  16. Beliefs and values about intra-operative teaching and learning: a case study of surgical teachers and trainees.

    PubMed

    Ong, Caroline C P; Dodds, Agnes; Nestel, Debra

    2016-08-01

    Surgeons require advanced psychomotor skills, critical decision-making and teamwork skills. Much of surgical skills training involve progressive trainee participation in supervised operations where case variability, operating team interaction and environment affect learning, while surgical teachers face the key challenge of ensuring patient safety. Using a theoretical framework of situated learning including cognitive apprenticeship, we explored teachers' and trainees' beliefs and values about intra-operative training and reasons for any differences. A qualitative case study method was used where five teacher-trainee pairs participating in an observed teaching operation were separately interviewed about the same operation. Thematic analysis of transcribed interviews and observations was performed with iterative refinement and a reflexive approach was adopted throughout the study. We found that in all cases, teachers and trainees had shared recognition of learning about technical skills whereas they differed in three cases regarding non-technical skills such as surgical reasoning and team management. Factors contributing to teacher and trainee satisfaction with the process were successful trainee completion of operation without need for surgeon take-over, a positive learning environment and learning new things. Teaching-learning behaviours observed and discussed were modeling, coaching and scaffolding, while exploration, reflection and articulation were less common. Our study reveals differing teacher and trainee perspectives of some aspects of intra-operative training and surfaces new reasons other than amount of feedback and autonomy given. Factors contributing to different perspectives include teacher and trainee abilities, values and situational influences. Targeted teaching-learning strategies could enhance intra-operative learning. PMID:26590983

  17. Assessing the operational life of flexible printed boards intended for continuous flexing applications : a case study.

    SciTech Connect

    Beck, David Franklin

    2011-01-01

    Through the vehicle of a case study, this paper describes in detail how the guidance found in the suite of IPC (Association Connecting Electronics Industries) publications can be applied to develop a high level of design assurance that flexible printed boards intended for continuous flexing applications will satisfy specified lifetime requirements.

  18. Operational river discharge forecasting in poorly gauged basins: the Kavango River Basin case study

    NASA Astrophysics Data System (ADS)

    Bauer-Gottwein, P.; Jensen, I. H.; Guzinski, R.; Bredtoft, G. K. T.; Hansen, S.; Michailovsky, C. I.

    2014-10-01

    Operational probabilistic forecasts of river discharge are essential for effective water resources management. Many studies have addressed this topic using different approaches ranging from purely statistical black-box approaches to physically-based and distributed modelling schemes employing data assimilation techniques. However, few studies have attempted to develop operational probabilistic forecasting approaches for large and poorly gauged river basins. This study is funded by the European Space Agency under the TIGER-NET project. The objective of TIGER-NET is to develop open-source software tools to support integrated water resources management in Africa and to facilitate the use of satellite earth observation data in water management. We present an operational probabilistic forecasting approach which uses public-domain climate forcing data and a hydrologic-hydrodynamic model which is entirely based on open-source software. Data assimilation techniques are used to inform the forecasts with the latest available observations. Forecasts are produced in real time for lead times of 0 to 7 days. The operational probabilistic forecasts are evaluated using a selection of performance statistics and indicators. The forecasting system delivers competitive forecasts for the Kavango River, which are reliable and sharp. Results indicate that the value of the forecasts is greatest for intermediate lead times between 4 and 7 days.

  19. The Costs of Operative Complications for Ankle Fractures: A Case Control Study

    PubMed Central

    Avilucea, Frank R.; Greenberg, Sarah E.; Grantham, W. Jeffrey; Sathiyakumar, Vasanth; Thakore, Rachel V.; Nwosu, Samuel K.; Archer, Kristin R.; Obremskey, William T.; Mir, Hassan R.; Sethi, Manish K.

    2014-01-01

    As our healthcare system moves towards bundling payments, it is vital to understand the potential financial implications associated with treatment of surgical complications. Considering that surgical treatment of ankle fractures is common, there remains minimal data relating costs to postsurgical intervention. We aimed to identify costs associated with ankle fracture complications through case-control analysis. Using retrospective analysis at a level I trauma center, 28 patients with isolated ankle fractures who developed complications (cases) were matched with 28 isolated ankle fracture patients without complications (controls) based on ASA score, age, surgery type, and fracture type. Patient charts were reviewed for demographics and complications leading to readmission/reoperation and costs were obtained from the financial department. Wilcoxon tests measured differences in the costs between the cases and controls. 28 out of 439 patients (6.4%) developed complications. Length of stay and median costs were significantly higher for cases than controls. Specifically, differences in total costs existed for infection and hardware-related pain. This is the first study to highlight the considerable costs associated with the treatment of complications due to isolated ankle fractures. Physicians must therefore emphasize methods to control surgical and nonsurgical factors that may impact postoperative complications, especially under a global payment system. PMID:25525521

  20. Evaluating National Weather Service Seasonal Forecast Products in Reservoir Operation Case Studies

    NASA Astrophysics Data System (ADS)

    Nielson, A.; Guihan, R.; Polebistki, A.; Palmer, R. N.; Werner, K.; Wood, A. W.

    2014-12-01

    Forecasts of future weather and streamflow can provide valuable information for reservoir operations and water management. A challenge confronting reservoir operators today is how to incorporate both climate and streamflow products into their operations and which of these forecast products are most informative and useful for optimized water management. This study incorporates several reforecast products provided by the Colorado Basin River Forecast Center (CBRFC) which allows a complete retrospective analysis of climate forecasts, resulting in an evaluation of each product's skill in the context of water resources management. The accuracy and value of forecasts generated from the Climate Forecast System version 2 (CFSv2) are compared to the accuracy and value of using an Ensemble Streamflow Predictions (ESP) approach. Using the CFSv2 may offer more insight when responding to climate driven extremes than the ESP approach because the CFSv2 incorporates a fully coupled climate model into its forecasts rather than using all of the historic climate record as being equally probable. The role of forecast updating frequency will also be explored. Decision support systems (DSS) for both Salt Lake City Parley's System and the Snohomish County Public Utility Department's (SnoPUD) Jackson project will be used to illustrate the utility of forecasts. Both DSS include a coupled simulation and optimization model that will incorporate system constraints, operating policies, and environmental flow requirements. To determine the value of the reforecast products, performance metrics meaningful to the managers of each system are to be identified and quantified. Without such metrics and awareness of seasonal operational nuances, it is difficult to identify forecast improvements in meaningful ways. These metrics of system performance are compared using the different forecast products to evaluate the potential benefits of using CFSv2 seasonal forecasts in systems decision making.

  1. Towards building equitable health systems in Sub-Saharan Africa: lessons from case studies on operational research

    PubMed Central

    2009-01-01

    Background Published practical examples of how to bridge gaps between research, policy and practice in health systems research in Sub Saharan Africa are scarce. The aim of our study was to use a case study approach to analyse how and why different operational health research projects in Africa have contributed to health systems strengthening and promoted equity in health service provision. Methods Using case studies we have collated and analysed practical examples of operational research projects on health in Sub-Saharan Africa which demonstrate how the links between research, policy and action can be strengthened to build effective and pro-poor health systems. To ensure rigour, we selected the case studies using pre-defined criteria, mapped their characteristics systematically using a case study development framework, and analysed the research impact process of each case study using the RAPID framework for research-policy links. This process enabled analysis of common themes, successes and weaknesses. Results 3 operational research projects met our case study criteria: HIV counselling and testing services in Kenya; provision of TB services in grocery stores in Malawi; and community diagnostics for anaemia, TB and malaria in Nigeria. Political context and external influences: in each case study context there was a need for new knowledge and approaches to meet policy requirements for equitable service delivery. Collaboration between researchers and key policy players began at the inception of operational research cycles. Links: critical in these operational research projects was the development of partnerships for capacity building to support new services or new players in service delivery. Evidence: evidence was used to promote policy dialogue around equity in different ways throughout the research cycle, such as in determining the topic area and in development of indicators. Conclusion Building equitable health systems means considering equity at different stages

  2. MEDCAN-GRO: Medical Capacity for African Nations - Growing Regional Operability A Case Study in Special Operations Forces Capacity Building.

    PubMed

    Givens, Melissa L; Verlo, April

    2015-01-01

    Medical Capacity for African Nations-Growing Regional Operability (MEDCAN-GRO) is a framework for addressing healthcare engagements that are intended to provide sustainable capacity building with partner nations. MEDCAN-GRO provides SOF units with a model that can be scaled to partner nation needs and aligned with the goals of the TSOC in an effort to enhance partner nation security. PMID:25770807

  3. Operational decision support system for large combined sewage systems: Lisbon/Tagus estuary case study.

    PubMed

    Póvoa, P; Nobre, A; Leitão, P; Galvão, P; Santos, H; Frazão, A; Neves, R; Matos, J S

    2015-01-01

    Managing combined sewage systems in large cities discharging to coastal waters, often bearing recreational activities, remains a challenge. Studying the impacts of such discharges requires the development of specific models. Hydrodynamic and water quality modelling of coastal waters employs numerical methods and algorithms, leading to the design of complex models which require expert use. The use of such models as decision support tools to simulate discharge impacts and define adequate corrective measures could represent a key part in meeting this challenge. In this paper, the authors describe the work undertaken to develop an operational decision support system (ODSS) methodology aiming to enable wastewater utilities' non-expert staff to carry out user-friendly scenario analysis based on computational fluid dynamics simulations. This article depicts the application and validation of the ODSS to the combined sewage system and the Tagus estuary of the city of Lisbon in Portugal. The ODSS was used for simulating the effects in the receiving coastal waters of a discharge caused by a scheduled maintenance operation in the sewage infrastructure. Results show that the use of such ODSS by non-expert staff increases their decision capabilities and knowledge of the wastewater utility's contribution to reducing negative impacts of sewage discharges on the receiving water bodies. PMID:26465314

  4. NASA's Advanced Multimission Operations System: A Case Study in Formalizing Software Architecture Evolution

    NASA Technical Reports Server (NTRS)

    Barnes, Jeffrey M.

    2011-01-01

    All software systems of significant size and longevity eventually undergo changes to their basic architectural structure. Such changes may be prompted by evolving requirements, changing technology, or other reasons. Whatever the cause, software architecture evolution is commonplace in real world software projects. Recently, software architecture researchers have begun to study this phenomenon in depth. However, this work has suffered from problems of validation; research in this area has tended to make heavy use of toy examples and hypothetical scenarios and has not been well supported by real world examples. To help address this problem, I describe an ongoing effort at the Jet Propulsion Laboratory to re-architect the Advanced Multimission Operations System (AMMOS), which is used to operate NASA's deep-space and astrophysics missions. Based on examination of project documents and interviews with project personnel, I describe the goals and approach of this evolution effort and then present models that capture some of the key architectural changes. Finally, I demonstrate how approaches and formal methods from my previous research in architecture evolution may be applied to this evolution, while using languages and tools already in place at the Jet Propulsion Laboratory.

  5. Streamlined environmental remediation characterization using remote sensing techniques: Case studies for the US Department of Energy, Oak Ridge Operations

    SciTech Connect

    Carden, D.M.; Smyre, J.L.; Evers, T.K.; King, A.L.

    1996-07-01

    This paper provides an overview of the DOE Oak Ridge Operations Remote Sensing Program and discusses how data from this program have assisted the environmental restoration program in streamlining site-characterization activities. Three case studies are described where remote sensing imagery has provided a more focused understanding of site problems with a resultant reduction in the need for costly and time-consuming, ground-based sampling approaches.

  6. Supply chain analysis of e-tailing versus retailing operation - a case study

    NASA Astrophysics Data System (ADS)

    Kumar, Sameer; Tiffany, Maryellen; Vaidya, Salil

    2016-07-01

    The swift growth of e-commerce or e-tailing as a consumer retail channel has made it a serious competitor to traditional retail channels and is changing consumers' purchasing behaviour. The purpose of this case study, based on Target and Amazon.com, is to analyse the attributes of traditional retailing, e-tailing, and hybrid supply chain models to form conclusions about the feasibility of an idealised supply chain model for the future. An integrated and generalised modelling framework is used that incorporates Six Sigma - define, measure, analyse, improve, control methodology leveraging various tools, including process flow maps, cause and effect diagram, performance efficiency metrics, failure mode and effects analysis (FMEA), and Monte Carlo simulation. Based on this analysis and research, the conclusion is that the idealised supply chain of the future may evolve into a hybrid supply chain, which includes both e-tail and retail channels. The main recommendations from this study include assessing the risks of migrating to such a hybrid supply chain and to leverage the recommended actions provided in the hybrid FMEA. To facilitate more effective and mature processes, this study can guide researchers in exhaustive empirical evaluations of hybrid supply chains, gather experiences and lessons learned for practitioners.

  7. Instructional Developer as Content Specialist: Three Case Studies Utilizing the Instructional Development-Operations Research Model.

    ERIC Educational Resources Information Center

    Faust, Stephen M.

    1980-01-01

    Presents a 3-phase model (content research, specification, delivery) for instructional development-operations research and describes its application in developing courses in zoology, geology, and paleontology. (MER)

  8. Effects of temperature on flood forecasting: analysis of an operative case study in Alpine basins

    NASA Astrophysics Data System (ADS)

    Ceppi, A.; Ravazzani, G.; Salandin, A.; Rabuffetti, D.; Montani, A.; Borgonovo, E.; Mancini, M.

    2013-04-01

    In recent years the interest in the forecast and prevention of natural hazards related to hydro-meteorological events has increased the challenge for numerical weather modelling, in particular for limited area models, to improve the quantitative precipitation forecasts (QPF) for hydrological purposes. After the encouraging results obtained in the MAP D-PHASE Project, we decided to devote further analyses to show recent improvements in the operational use of hydro-meteorological chains, and above all to better investigate the key role played by temperature during snowy precipitation. In this study we present a reanalysis simulation of one meteorological event, which occurred in November 2008 in the Piedmont Region. The attention is focused on the key role of air temperature, which is a crucial feature in determining the partitioning of precipitation in solid and liquid phase, influencing the quantitative discharge forecast (QDF) into the Alpine region. This is linked to the basin ipsographic curve and therefore by the total contributing area related to the snow line of the event. In order to assess hydrological predictions affected by meteorological forcing, a sensitivity analysis of the model output was carried out to evaluate different simulation scenarios, considering the forecast effects which can radically modify the discharge forecast. Results show how in real-time systems hydrological forecasters have to consider also the temperature uncertainty in forecasts in order to better understand the snow dynamics and its effect on runoff during a meteorological warning with a crucial snow line over the basin. The hydrological ensemble forecasts are based on the 16 members of the meteorological ensemble system COSMO-LEPS (developed by ARPA-SIMC) based on the non-hydrostatic model COSMO, while the hydrological model used to generate the runoff simulations is the rainfall-runoff distributed FEST-WB model, developed at Politecnico di Milano.

  9. Operational resilience of reservoirs to climate change, agricultural demand, and tourism: A case study from Sardinia.

    PubMed

    Mereu, Simone; Sušnik, Janez; Trabucco, Antonio; Daccache, Andre; Vamvakeridou-Lyroudia, Lydia; Renoldi, Stefano; Virdis, Andrea; Savić, Dragan; Assimacopoulos, Dionysis

    2016-02-01

    Many (semi-) arid locations globally, and particularly islands, rely heavily on reservoirs for water supply. Some reservoirs are particularly vulnerable to climate and development changes (e.g. population change, tourist growth, hydropower demands). Irregularities and uncertainties in the fluvial regime associated with climate change and the continuous increase in water demand by different sectors will add new challenges to the management and to the resilience of these reservoirs. The resilience of vulnerable reservoirs must be studied in detail to prepare for and mitigate potential impacts of these changes. In this paper, a reservoir balance model is developed and presented for the Pedra e' Othoni reservoir in Sardinia, Italy, to assess resilience to climate and development changes. The model was first calibrated and validated, then forced with extensive ensemble climate data for representative concentration pathways (RCPs) 4.5 and 8.5, agricultural data, and with four socio-economic development scenarios. Future projections show a reduction in annual reservoir inflow and an increase in demand, mainly in the agricultural sector. Under no scenario is reservoir resilience significantly affected, the reservoir always achieves refill. However, this occurs at the partial expenses of hydropower production with implications for the production of renewable energy. There is also the possibility of conflict between the agricultural sector and hydropower sector for diminishing water supply. Pedra e' Othoni reservoir shows good resilience to future change mostly because of the disproportionately large basin feeding it. However this is not the case of other Sardinian reservoirs and hence a detailed resilience assessment of all reservoirs is needed, where development plans should carefully account for the trade-offs and potential conflicts among sectors. For Sardinia, the option of physical connection between reservoirs is available, as are alternative water supply measures

  10. Case Study of Using Resources about Sonar Operators To Teach Instructional Design.

    ERIC Educational Resources Information Center

    Mclellan, Hilary

    1993-01-01

    Describes a fictional account of the work of a submarine sonar operator ("The Hunt for Red October" by Tom Clancy) that captures the practitioner in a complex real-world work context featuring sophisticated electronic technologies. Describes how fiction can be adapted for and used as a basis for instructional design students to explore problem…

  11. Success in an Introductory Operations Research Course: A Case Study at the United Arab Emirates University

    ERIC Educational Resources Information Center

    Yousef, Darwish Abdulrahman

    2009-01-01

    Purpose: The purpose of this paper is to examine the influence of a number of factors such as high school major, high school score, gender, Stat105, Maths I, Maths II grades, and grade point average (GPA) on students' academic performance in an introductory operations research (OR) course at the department of Business Administration--College of…

  12. The Role of Leadership in Starting and Operating Blended Learning Charter Schools: A Multisite Case Study

    ERIC Educational Resources Information Center

    Agostini, Michael Eric

    2013-01-01

    Heavily utilizing both instructional technology and face-to-face instruction within a bricks-and-mortar school environment, blended learning charter schools are gaining attention as a cost-effective school design. As educators turn to these blended learning school models to improve both the operational efficiency and student outcomes of…

  13. Outcomes Following Operative Treatment of open Fractures of the Distal Radius: A Case Control Study

    PubMed Central

    MacKay, Brendan J; Montero, Nicole; Paksima, Nader; Egol, Kenneth A

    2013-01-01

    Purpose To report radiographic, clinical, and patient-based functional outcomes following contemporary operative treatment of patients who sustained an open distal radius fracture and compare them to a similar group of patients treated operatively for closed distal radius fractures. Methods Over five years, 601 patients with a distal radius fracture presented to our academic medical center, including one Level 1 trauma hospital, and were prospectively enrolled in an upper extremity trauma database. Patients with open distal radius fractures underwent irrigation, debridement, and operative fixation within 24 hours of presentation. Closed distal radius fractures requiring operative fixation were treated electively. Retrospective review of the database identified eighteen open fractures of the distal radius (11 type I, 6 type II, 1 type IIIa). The open fracture patients were individually matched with eighteen closed distal radius fracture patients who underwent surgical fixation based on age, sex, injury to dominant extremity, fracture pattern, and method of fracture fixation. Clinical, radiographic, patient- based functional outcomes, and complications were recorded at routine postoperative intervals. Results Follow-up was greater than 77% in both groups at all time points. The open and closed groups were similar in regards to age, gender, BMI, race, tobacco use, income, employment status, hand dominance, injury to dominant extremity, mechanism of injury, fracture classification, method of fracture fixation, and presence of concomitant injury. Postoperative complications and reoperation rates were similar between the open and closed groups. Union rates and radiographic alignment one year postoperatively were similar between the open and closed fracture groups. At final follow-up, range of motion parameters, grip strengths, DASH indices, and subjective pain scores were similar between both groups. Discussion Open distal radius fractures treated with early debridement

  14. Performance After Rotator Cuff Tear and Operative Treatment: A Case-Control Study of Major League Baseball Pitchers

    PubMed Central

    Namdari, Surena; Baldwin, Keith; Ahn, Albert; Huffman, G. Russell; Sennett, Brian J.

    2011-01-01

    Context: Little is known about pitching performance or lack of it among Major League Baseball (MLB) pitchers who undergo operative treatment of rotator cuff tears. Objective: To assess pitching performance outcomes in MLB players who needed operative treatment of rotator cuff tears and to compare performance in these athletes with that in a control group of MLB players. Design: Case-control study. Setting: Publicly available player profiles, press releases, and team injury reports. Patients or Other Participants: Thirty-three MLB pitchers with documented surgery to treat rotator cuff tears and 117 control pitchers who did not have documented rotator cuff tears were identified. Main Outcome Measure(s): Major League Baseball pitching attrition and performance variables. Results: Players who underwent rotator cuff surgery were no more likely not to play than control players. Performance variables of players who underwent surgery improved after surgery but never returned to baseline preoperative status. Players who needed rotator cuff surgery typically were more experienced and had better earned run averages than control players. Conclusions: Pitchers who had symptomatic rotator cuff tears that necessitated operative treatment tended to decline gradually in performance leading up to their operations and to improve gradually over the next 3 seasons. In contrast to what we expected, they did not have a greater attrition rate than their control counterparts; however, their performances did not return to preoperative levels over the course of the study. PMID:21669100

  15. Inspection of a hydropower tunnel using remotely operated vehicles (ROV): A 5-year case study

    SciTech Connect

    Hosko, M.A.

    1995-12-31

    Since commercial operation in 1988, the 21 MW Raystown Hydroelectric Project, William F. Matson Generating Station in central Pennsylvania, has used several different methods to inspect the condition of the 283-meter (930-foot) long, 3.65-meter (12-foot) diameter, concrete-lined tunnel. These inspections have been required to meet the FERC license conditions and the separate Memorandum of Understanding (MOU) between the U.S. Army Corps of Engineers, Baltimore District and the Licensee, Allegheny Electric Cooperative, Inc., of Harrisburg, PA. Since the tunnel and connected 168-meter (550-foot) long steel penstock are the only water passage to the two-unit generating plant, any intrusive inspection requires an outage, thus the optimal inspection technique minimizes the plant downtime. Inspections have included a lengthy and costly dewatered tunnel walk through, an underwater inspection using commercial divers and hand-held video, and most recently three annual inspections using three different types of Remotely Operated Vehicles (ROV) supplied by vendor services. Each inspection concentrated on the examination of the condition of the tunnel concrete, including radial cracks and condition of construction joints, longitudinal crack propagation, aggregate erosion and concrete patch condition. Use of a computerized database program for mapping will also be discussed as a useful tool. This paper details experience with each of these methods with an emphasis on lessons learned and applications for the hydro industry.

  16. Benthic foraminiferal responses to operational drill cutting discharge in the SW Barents Sea - a case study.

    NASA Astrophysics Data System (ADS)

    Aagaard-Sørensen, Steffen; Junttila, Juho; Dijkstra, Noortje

    2016-04-01

    Petroleum related exploration activities started in the Barents Sea 1980, reaching 97 exploration wells drilled per January 2013. The biggest operational discharge from drilling operations in the Barents Sea is the release of drill cuttings (crushed seabed and/or bedrock) and water based drilling muds including the commonly used weighing material barite (BaSO4). Barium (Ba), a constituent of barite, does not degrade and can be used to evaluate dispersion and accumulation of drill waste. The environmental impact associated with exploration drilling within the Goliat Field, SW Barents Sea in 2006 was evaluated via a multiproxy investigation of local sediments. The sediments were retrieved in November 2014 at ~350 meters water depth and coring sites were selected at distances of 5, 30, 60, 125 and 250 meters from the drill hole in the eastward downstream direction. The dispersion pattern of drill waste was estimated via measurements of sediment parameters including grain size distribution and water content in addition to heavy metal and total organic carbon contents. The environmental impact was evaluated via micro faunal analysis based on benthic foraminiferal (marine shell bearing protists) fauna composition and concentration changes. Observing the sediment parameters, most notably Ba levels, reveals that dispersion of drill waste was limited to <125 meters from the drill site with drill waste thicknesses decreasing downstream. The abruptness and quantity of drill waste sedimentation initially smothered the foraminiferal fauna at ≤ 30 meters from the drill site, while at a distance of 60 meters, the fauna seemingly survived and bioturbation persisted. Analysis of the live (Nov 2014) foraminiferal fauna reveals a natural species composition at all distances from the drill site within the top sediments (0-5 cm core depth). Furthermore, the fossil foraminiferal fauna composition found within post-impacted top sediment sections, particularly in the cores situated at

  17. Intelligence-aided multitarget tracking for urban operations - a case study: counter terrorism

    NASA Astrophysics Data System (ADS)

    Sathyan, T.; Bharadwaj, K.; Sinha, A.; Kirubarajan, T.

    2006-05-01

    In this paper, we present a framework for tracking multiple mobile targets in an urban environment based on data from multiple sources of information, and for evaluating the threat these targets pose to assets of interest (AOI). The motivating scenario is one where we have to track many targets, each with different (unknown) destinations and/or intents. The tracking algorithm is aided by information about the urban environment (e.g., road maps, buildings, hideouts), and strategic and intelligence data. The tracking algorithm needs to be dynamic in that it has to handle a time-varying number of targets and the ever-changing urban environment depending on the locations of the moving objects and AOI. Our solution uses the variable structure interacting multiple model (VS-IMM) estimator, which has been shown to be effective in tracking targets based on road map information. Intelligence information is represented as target class information and incorporated through a combined likelihood calculation within the VS-IMM estimator. In addition, we develop a model to calculate the probability that a particular target can attack a given AOI. This model for the calculation of the probability of attack is based on the target kinematic and class information. Simulation results are presented to demonstrate the operation of the proposed framework on a representative scenario.

  18. Heat stress management program improving worker health and operational effectiveness: a case study.

    PubMed

    Huss, Rosalyn G; Skelton, Scott B; Alvis, Kimberly L; Shane, Leigh A

    2013-03-01

    Heat stress monitoring is a vital component of an effective health and safety program when employees work in exceptionally warm environments. Workers at hazardous waste sites often wear personal protective equipment (PPE), which increases the body heat stress load. No specific Occupational Safety and Health Administration (OSHA) regulations address heat stress; however, OSHA does provide several guidance documents to assist employers in addressing this serious workplace health hazard. This article describes a heat stress and surveillance plan implemented at a hazardous waste site as part of the overall health and safety program. The PPE requirement for work at this site, coupled with extreme environmental temperatures, made heat stress a significant concern. Occupational health nurses and industrial hygienists developed a monitoring program for heat stress designed to prevent the occurrence of significant heat-related illness in site workers. The program included worker education on the signs of heat-related illness and continuous physiologic monitoring to detect early signs of heat-related health problems. Biological monitoring data were collected before workers entered the exclusion zone and on exiting the zone following decontamination. Sixty-six site workers were monitored throughout site remediation. More than 1,700 biological monitoring data points were recorded. Outcomes included improved worker health and safety, and increased operational effectiveness. PMID:23429639

  19. Beliefs and Values about Intra-Operative Teaching and Learning: A Case Study of Surgical Teachers and Trainees

    ERIC Educational Resources Information Center

    Ong, Caroline C.; Dodds, Agnes; Nestel, Debra

    2016-01-01

    Surgeons require advanced psychomotor skills, critical decision-making and teamwork skills. Much of surgical skills training involve progressive trainee participation in supervised operations where case variability, operating team interaction and environment affect learning, while surgical teachers face the key challenge of ensuring patient…

  20. Health, safety, and environmental management system operation in contracting companies: A case study.

    PubMed

    Nassiri, Parvin; Yarahmadi, Rasoul; Gholami, Pari Shafaei; Hamidi, Abdolamir; Mirkazemi, Roksana

    2016-05-01

    Systematic and cooperative interactions among parent industry and contractors are necessary for a successful health, safety, and environmental management system (HSE-MS). This study was conducted to evaluate the HSE-MS performance in contracting companies in one of the petrochemical industries in Iran during 2013. Managers of parent and contracting companies participated in this study. The data collection forms included 7 elements of an integrated HSE-MS (leadership and commitment; policy and strategic objectives; organization, resources, and documentation; evaluation and risk management; planning; implementation and monitoring; auditing and reviewing). The results showed that mean percentage of the total scores in seven elements of HSE-MS was 85.7% and 87.0% based on self-report and report of parent company, respectively. In conclusion, this study showed that HSE-MS was desirably functioning; however, improvement to ensure health and safety of workers is still required. PMID:26418847

  1. Co-operation and conflict under hard and soft contracting regimes: case studies from England and Wales

    PubMed Central

    2013-01-01

    Background This paper examines NHS secondary care contracting in England and Wales in a period which saw increasing policy divergence between the two systems. At face value, England was making greater use of market levers and utilising harder-edged service contracts incorporating financial penalties and incentives, while Wales was retreating from the 1990s internal market and emphasising cooperation and flexibility in the contracting process. But there were also cross-border spill-overs involving common contracting technologies and management cultures that meant that differences in on-the-ground contracting practices might be smaller than headline policy differences suggested. Methods The nature of real-world contracting behaviour was investigated by undertaking two qualitative case studies in England and two in Wales, each based on a local purchaser/provider network. The case studies involved ethnographic observations and interviews with staff in primary care trusts (PCTs) or local health boards (LHBs), NHS or Foundation trusts, and the overseeing Strategic Health Authority or NHS Wales regional office, as well as scrutiny of relevant documents. Results Wider policy differences between the two NHS systems were reflected in differing contracting frameworks, involving regional commissioning in Wales and commissioning by either a PCT, or co-operating pair of PCTs in our English case studies, and also in different oversight arrangements by higher tiers of the service. However, long-term relationships and trust between purchasers and providers had an important role in both systems when the financial viability of organisations was at risk. In England, the study found examples where both PCTs and trusts relaxed contractual requirements to assist partners faced with deficits. In Wales, news of plans to end the purchaser/provider split meant a return to less precisely-specified block contracts and a renewed concern to build cooperation between LHB and trust staff

  2. Case Studies

    ERIC Educational Resources Information Center

    Ritter, Lois A., Ed.; Sue, Valerie M., Ed.

    2007-01-01

    This article presents two case studies using online surveys for evaluation. The authors begin with an example of a needs assessment survey designed to measure the amount of help new students at a university require in their first year. They then discuss the follow-up survey conducted by the same university to measure the effectiveness of the…

  3. Going Boldly Into the Future: A Series of Case Studies of Co-Operative Research Centres and Their Relationships with the VET Sector.

    ERIC Educational Resources Information Center

    Ferrier, Fran; Trood, Clifford; Whittingham, Karen

    This document presents case studies of 10 cooperative research centers (CRCs) across Australia and their relationships with the vocational education and training (VET) sector. The CRCs profiled in the case studies are as follows: Co-operative Research Centre for Sustainable Rice Production; Cast Alloy and Solidification Technology Co-operative…

  4. Evaluation of operational, economic, and environmental performance of mixed and selective collection of municipal solid waste: Porto case study.

    PubMed

    Teixeira, Carlos A; Russo, Mário; Matos, Cristina; Bentes, Isabel

    2014-12-01

    This article describes an accurate methodology for an operational, economic, and environmental assessment of municipal solid waste collection. The proposed methodological tool uses key performance indicators to evaluate independent operational and economic efficiency and performance of municipal solid waste collection practices. These key performance indicators are then used in life cycle inventories and life cycle impact assessment. Finally, the life cycle assessment environmental profiles provide the environmental assessment. We also report a successful application of this tool through a case study in the Portuguese city of Porto. Preliminary results demonstrate the applicability of the methodological tool to real cases. Some of the findings focus a significant difference between average mixed and selective collection effective distance (2.14 km t(-1); 16.12 km t(-1)), fuel consumption (3.96 L t(-1); 15.37 L t(-1)), crew productivity (0.98 t h(-1) worker(-1); 0.23 t h(-1) worker(-1)), cost (45.90 € t(-1); 241.20 € t(-1)), and global warming impact (19.95 kg CO2eq t(-1); 57.47 kg CO2eq t(-1)). Preliminary results consistently indicate: (a) higher global performance of mixed collection as compared with selective collection; (b) dependency of collection performance, even in urban areas, on the waste generation rate and density; (c) the decline of selective collection performances with decreasing source-separated material density and recycling collection rate; and (d) that the main threats to collection route efficiency are the extensive collection distances, high fuel consumption vehicles, and reduced crew productivity. PMID:25369976

  5. Decision support for green supply chain operations by integrating dynamic simulation and LCA indicators: diaper case study.

    PubMed

    Adhitya, Arief; Halim, Iskandar; Srinivasan, Rajagopalan

    2011-12-01

    As the issue of environmental sustainability is becoming an important business factor, companies are now looking for decision support tools to assess the fuller picture of the environmental impacts associated with their manufacturing operations and supply chain (SC) activities. Lifecycle assessment (LCA) is widely used to measure the environmental consequences assignable to a product. However, it is usually limited to a high-level snapshot of the environmental implications over the product value chain without consideration of the dynamics arising from the multitiered structure and the interactions along the SC. This paper proposes a framework for green supply chain management by integrating a SC dynamic simulation and LCA indicators to evaluate both the economic and environmental impacts of various SC decisions such as inventories, distribution network configuration, and ordering policy. The advantages of this framework are demonstrated through an industrially motivated case study involving diaper production. Three distinct scenarios are evaluated to highlight how the proposed approach enables integrated decision support for green SC design and operation. PMID:22029393

  6. Using RFID Tagging in a Mining Industry Maintenance, Repair, and Operating (MRO) Supply Warehouse: A Case Study

    ERIC Educational Resources Information Center

    Smith, George D.

    2008-01-01

    The use of Radio Frequency Identification (RFID) technology has been shown to be successful by reducing operating costs in the retail and manufacturing industries, but has never been considered in the literature for a mining industry maintenance, repair, and operating (MRO) supply chain. This field study was conducted to determine whether or not…

  7. Cask fleet operations study

    SciTech Connect

    Not Available

    1988-01-01

    The Nuclear Waste Policy Act of 1982 assigned to the Department of Energy's (DOE) Office of Civilian Waste Management the responsibility for disposing of high-level waste and spent fuel. A significant part of that responsibility involves transporting nuclear waste materials within the federal waste management system; that is, from the waste generator to the repository. The lead responsibility for transportation operations has been assigned to Oak Ridge Operations, with Oak Ridge National Laboratory (ORNL) providing technical support through the Transportation Operations Support Task Group. One of the ORNL support activities involves assessing what facilities, equipment and services are required to assure that an acceptable, cost-effective and safe transportation operations system can be designed, operated and maintained. This study reviews, surveys and assesses the experience of Nuclear Assurance Corporation (NAC) in operating a fleet of spent-fuel shipping casks to aid in developing the spent-fuel transportation system.

  8. Evaluating the improvements of the BOLAM meteorological model operational at ISPRA: A case study approach - preliminary results

    NASA Astrophysics Data System (ADS)

    Mariani, S.; Casaioli, M.; Lastoria, B.; Accadia, C.; Flavoni, S.

    2009-04-01

    Fritsch. A fully updated serial version of the BOLAM code has been recently acquired. Code improvements include a more precise advection scheme (Weighted Average Flux); explicit advection of five hydrometeors, and state-of-the-art parameterization schemes for radiation, convection, boundary layer turbulence and soil processes (also with possible choice among different available schemes). The operational implementation of the new code into the SIMM model chain, which requires the development of a parallel version, will be achieved during 2009. In view of this goal, the comparative verification of the different model versions' skill represents a fundamental task. On this purpose, it has been decided to evaluate the performance improvement of the new BOLAM code (in the available serial version, hereinafter BOLAM 2007) with respect to the version with the Kain-Fritsch scheme (hereinafter KF version) and to the older one employing the Kuo scheme (hereinafter Kuo version). In the present work, verification of precipitation forecasts from the three BOLAM versions is carried on in a case study approach. The intense rainfall episode occurred on 10th - 17th December 2008 over Italy has been considered. This event produced indeed severe damages in Rome and its surrounding areas. Objective and subjective verification methods have been employed in order to evaluate model performance against an observational dataset including rain gauge observations and satellite imagery. Subjective comparison of observed and forecast precipitation fields is suitable to give an overall description of the forecast quality. Spatial errors (e.g., shifting and pattern errors) and rainfall volume error can be assessed quantitatively by means of object-oriented methods. By comparing satellite images with model forecast fields, it is possible to investigate the differences between the evolution of the observed weather system and the predicted ones, and its sensitivity to the improvements in the model code

  9. Operator Certification Study Guide.

    ERIC Educational Resources Information Center

    American Water Works Association, Denver, CO.

    This study guide contains typical questions and answers that all levels of water treatment plant operators might expect to find on a certification examination. The manual covers the basic sciences, treatment techniques, testing procedures, and federal legislation. (Author/SB)

  10. Clinical comparison of laparoscopy vs open surgery in a radical operation for rectal cancer: A retrospective case-control study

    PubMed Central

    Huang, Chen; Shen, Jia-Cheng; Zhang, Jing; Jiang, Tao; Wu, Wei-Dong; Cao, Jun; Huang, Ke-Jian; Qiu, Zheng-Jun

    2015-01-01

    AIM: To assess the diverse immediate and long-term clinical outcomes, a retrospective comparison between laparoscopic and conventional operation was performed. METHODS: A total number of 916 clinical cases, from January 2006 to December 2013 in our hospital, were analyzed which covered 492 patients underwent the laparoscopy in radical resection (LRR) and 424 cases in open radical resection (ORR). A retrospective analysis was proceeded by comparing the general information, surgery performance, pathologic data, postoperative recovery and complications as well as long-term survival to investigate the diversity of immediate and long-term clinical outcomes of laparoscopic radical operation. RESULTS: There were no statistically significance differences between gender, age, height, weight, body mass index (BMI), tumor loci, tumor node metastasis stages, cell differentiation degree or American Society of Anesthesiologists scores of the patients (P > 0.05). In contrast to the ORR group, the LRR group experienced less operating time (P < 0.001), a lower blood loss (P < 0.001), and had a 2.44% probability of conversion to open surgery. Postoperative bowel function recovered more quickly, analgesic usage and the average hospital stay (P < 0.001) were reduced after LRR. Lymph node dissection during LRR appeared to be slightly more than in ORR (P = 0.338). There were no obvious differences in the lengths and margins (P = 0.182). And the occurrence rate in the two groups was similar (P = 0.081). Overall survival rate of ORR and LRR for 1, 3 and 5 years were 94.0% and 93.6% (P = 0.534), 78.1% and 80.9% (P = 0.284) and 75.2% and 77.0% (P = 0.416), respectively. CONCLUSION: Laparoscopy as a radical operation for rectal cancer was safe, produced better immediate outcomes. Long-term survival of laparoscopy revealed that it was similar to the open operation. PMID:26730165

  11. [Operable cancers of the rectum: preoperative radiotherapy. Retrospective study of 192 cases treated at the Curie Institute].

    PubMed

    Salmon, R J; Guillet, J L; Vige, P; Durand, J C; Fenton, J; Mathieu, G; Rousseau, J; Pilleron, J P

    1983-01-01

    Pre-operative irradiation in operable cancer of the rectum remains controversial. This is a report of a retrospective study about 192 patients treated between 1958 and 1980 at the Institut Curie (Paris) for a rectal cancer. An abdomino-perineal resection was done in 144 patients, 83 as a primary procedure and 61 after a pre-operative irradiation. During the same period 48 patients had an anterior resection. We put in this study the only patients who underwent curative surgery. Irradiation was given with high voltage by a four field "box technique". The tumour received 40 to 50 grays in 5 to 6 weeks. The operation was done at least 6 weeks after the end of the irradiation. There was no difference for the sex, and age of the patients, and in the size of the tumour before treatment, between the patients irradiated and those operated on as a primary procedure. There was no difference in the operative mortality as well as the 3, 5, and 10 year survival in the two groups. Pre-operative irradiation did not change the number of perineal recurrences or the number of visceral metastases. The healing of the perineum was significantly longer in the irradiated patients (p less than 0.001). The survival was closely related to the Dukes classification. The number of Dukes A patients was significantly higher (p = 0.02) after irradiation: 26/61 (43%) vs 19/83 (23%) when the patients were not irradiated. In our experience pre-operative irradiation can shrink some large tumours helping the surgical act.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:6667355

  12. Case Study: The Use of a Hypercard Simulation to Aid in the Teaching of Laboratory Apparatus Operation.

    ERIC Educational Resources Information Center

    Waddick, John

    1994-01-01

    Compares the effect of a chemistry computer simulation, written by the author, with the effect of an instructor demonstration. The study indicates that in this particular situation the operation of a spectrophotometer can be effectively taught by computer simulation method. The program is written using HyperTalk, the HyperCard programming…

  13. Decision making and co-operation between stakeholders within the process of sick leave. A case study in a Danish municipality.

    PubMed

    Johansen, Kristina; Andersen, John Sahl; Mikkelsen, Sigurd; Lynge, Elsebeth

    2011-01-01

    The study addresses how recent reforms of the Sickness Benefit Act in Denmark are put into practice. A single case study embedded with five subunits of analysis based on "real life" cases has been conducted in a Danish municipality. Five "sick-listed" citizens and their respective municipal case manager and general practitioner (GP) were interviewed. Two key persons within the municipality were interviewed as background informants. The GPs and case managers ability to co-operate was hampered by lack of time, frequent staff turnover, lack of financial resources, and low accessibility. The motivation for co-operation was low due to low status of social medical issues, lack of feedback and lack of trust. The co-operation was characterized by sequential task integration. The stakeholders encountered difficulties when reciprocal task integration was needed. The decision making was affected by legal constraints and conflicting paradigms of key stakeholders. Rather than forcing co-operation, policymakers should increase the stakeholders' abilities and improve the conditions that create the low level of trust and hamper the willingness to co-operate. PMID:20795840

  14. A case-control study of post-operative endophthalmitis diagnosed at a Spanish hospital over a 13-year-period.

    PubMed

    Asencio, M A; Huertas, M; Carranza, R; Tenias, J M; Celis, J; Gonzalez-Del Valle, F

    2015-01-01

    A retrospective case-control study of patients who had undergone cataract extraction at a Spanish hospital over a 13-year period was conducted to identify the risk factors for developing post-operative endophthalmitis (POE). During the study period, the type of antibiotic prophylaxis was changed from subconjunctival gentamicin to the addition of both vancomycin and gentamicin to the irrigating solution. The overall incidence of POE was 0·19% (35 cases/18 287 operations). For the period prior to the change in antibiotic prophylaxis, the incidence rate of POE was 3·4 cases/1000 operations while in the latter period the incidence rate decreased to 0·34 cases/1000 operations. All patients who presented a virulent microorganism had a final visual acuity worse than 20/200. The only significant risk factor identified was the type of prophylaxis used (odds ratio 1·97, 95% confidence interval 0·94-4·14, P = 0·07). There were no significant differences between cases and controls although choice of surgeon approached significance. PMID:24612657

  15. A Case Study on Collective Cognition and Operation in Team-Based Computer Game Design by Middle-School Children

    ERIC Educational Resources Information Center

    Ke, Fengfeng; Im, Tami

    2014-01-01

    This case study examined team-based computer-game design efforts by children with diverse abilities to explore the nature of their collective design actions and cognitive processes. Ten teams of middle-school children, with a high percentage of minority students, participated in a 6-weeks, computer-assisted math-game-design program. Essential…

  16. Case Study: Testing with Case Studies

    ERIC Educational Resources Information Center

    Herreid, Clyde Freeman

    2015-01-01

    This column provides original articles on innovations in case study teaching, assessment of the method, as well as case studies with teaching notes. This month's issue discusses using case studies to test for knowledge or lessons learned.

  17. Operational NIR-red Algorithms for Estimating Chlorophyll-a Concentration in Coastal Waters - The Azov Sea Case Study

    NASA Astrophysics Data System (ADS)

    Moses, W.; Gitelson, A. A.; Berdnikov, S.; Saprygin, V.; Bowles, J. H.; Povazhnyi, V.

    2012-12-01

    We present here results that strongly support the use of MERIS-based NIR-red algorithms as standard tools for estimating chlorophyll-a (chl-a) concentration in turbid productive waters. The study was carried out as one of the steps in testing the potential of the universal applicability of previously developed NIR-red algorithms, which were originally calibrated using a limited set of MERIS imagery and in situ data from the Azov Sea and the Taganrog Bay, Russia, and data that were synthetically generated using a radiative transfer model. We used an extensive set of MERIS imagery and in situ data collected over a period of three years in the Azov Sea and the Taganrog Bay for this validation task. We found that the NIR-red algorithms gave consistently highly accurate estimates of chl-a concentration, with the root mean square error as low as 5.92 mg m-3 for the two-band algorithm and 5.91 mg m-3 for the three-band algorithm for the dataset with chl-a concentrations ranging from 1.09 mg m-3 to 107.82 mg m-3. This obviates the need for case-specific reparameterization of the algorithms, as long as the specific absorption coefficient of phytoplankton in the water does not change drastically, and presents a strong case for the use of NIR-red algorithms as standard algorithms that can be routinely applied for near-real-time quantitative monitoring of chl-a concentration in the Azov Sea and the Taganrog Bay, and potentially elsewhere, which will be a real boon to ecologists, natural resource managers and environmental decision-makers. We also present a temporal series of chl-a maps generated using the NIR-red algorithms from images acquired by the space-borne hyperspectral sensor HICO over the Taganrog Bay. The fine spatial resolution (96 m) of HICO images allows for a detailed analysis of the spatial distribution pattern of chl-a, and the fine spectral resolution (5.7 nm) offers a great potential for phytoplankton species discrimination. With the recent demise of MERIS

  18. Optimizing the Use of Chief Complaint & Diagnosis for Operational Decision Making: An EMR Case Study of the 2010 Haiti Earthquake

    PubMed Central

    Bambrick, Alexandra T.; Passman, Dina B.; Torman, Rachel M.; Livinski, Alicia A.; Olsen, Jennifer M.

    2014-01-01

    Introduction: Data from an electronic medical record (EMR) system can provide valuable insight regarding health consequences in the aftermath of a disaster. In January of 2010, the U.S. Department of Health and Human Services (HHS) deployed medical personnel to Haiti in response to a crippling earthquake. An EMR system was used to record patient encounters in real-time and to provide data for decision support during response activities. Problem: During the Haiti response, HHS monitored the EMR system by recoding diagnoses into seven broad categories. At the conclusion of the response, it was evident that a new diagnosis categorization process was needed to provide a better description of the patient encounters that were seen in the field. After examining the EMRs, researchers determined nearly half of the medical records were missing diagnosis data. The objective of this study was to develop and test a new method of categorization for patient encounters to provide more detailed data for decision making. Methods: A single researcher verified or assigned a new diagnosis for 8,787 EMRs created during the Haiti response. This created a new variable, the Operational Code, which was based on available diagnosis data and chief complaint. Retrospectively, diagnoses recorded in the field and Operational Codes were categorized into eighteen categories based on the ICD-9-CM diagnostic system. Results: Creating an Operational Code variable led to a more robust data set and a clearer depiction emerged of the clinical presentations seen at six HHS clinics set up in the aftermath of Haiti’s earthquake. The number of records with an associated ICD-9 code increased 106% from 4,261 to 8,787. The most frequent Operational Code categories during the response were: General Symptoms, Signs, and Ill-Defined Conditions (34.2%), Injury and Poisoning (18.9%), Other (14.7%), Respiratory (4.8%), and Musculoskeletal and Connective Tissue (4.8%). Conclusion: The Operational Code methodology

  19. Correlation of Hydraulic Fracturing Induced Seismicity with Operation Parameters of Shale Gas Extraction: Two Case Studies in Western Canada

    NASA Astrophysics Data System (ADS)

    Farahbod, A. M.; Kao, H.; Cassidy, J. F.; Snyder, D. B.; Cairns, S.; Walker, D.

    2015-12-01

    Northeast British Columbia, specifically the Horn River Basin (HRB) and Montney Trend, are among the largest shale gas production regions in western Canada. In contrast, there has been no large-scale hydraulic fracturing (HF) operation in the Northwest Territories in the Norman Wells region of the central Mackenzie valley. In this study, we investigate the effect of injection pressure, operation duration and injected volume on the observed seismicity in the HRB and Norman Wells regions and compare our observations with the pre-HF records. In the HRB, we apply the single-station location and waveform correlation methods to establish a homogenous earthquake catalog (2006/12-2011/12). In the Northwest Territories, we combine data from a local seismograph network of 4 stations plus a dense array of 7 stations located from 1 km to 50 km from the operation wells to locate earthquakes (2013/09-2014/07). In the HRB, the initial effect of an increased injected volume is an increase in earthquake frequency but not magnitude. Local earthquakes gradually become larger in magnitude as the scale of HF in the region expands. While the injection pressure during HF operations has been regulated at a relatively constant level, the massive increase of injection volume in 2010 and 2011 coincides with a series of ML>3 events. Relatively large seismic moment release (>1014 N m) occurred only when the monthly injected volume exceeded ~150,000 m3. In addition, we observe variable time lags, from days to up to 4 months between intense HF and the occurrence of a significant local earthquake. On the other hand, in the Norman Wells region, two small-scale HF were performed in 2014 with a total injected volume of ~ 14000 m3. We observed an increase in the number of micro-earthquakes (M < 2.0) during the HF period without a clear change in the overall seismic pattern. From these two observations, we conclude that HF operations do not necessarily result in an increase in the occurrence rate of

  20. The active tropical cyclone season of 2005 2006 over Northwest Australia: Operational model performance and high resolution case studies

    NASA Astrophysics Data System (ADS)

    Buckley, B. W.; Leslie, L. M.; Leplastrier, M.; Qi, L.

    2007-08-01

    There are three main aims of this study. First, the main features of the active 2005 2006 Australian region tropical cyclone (TC) season are summarized, with particular emphasis on the northwest Australian region. Second, an assessment is made of the skill of the available operational global and regional numerical weather prediction (NWP) models for three of the most significant TCs (TCs Clare, Glenda and Hubert), each of which made landfall on the northwest coast of Australia. Third, high-resolution numerical modelling simulations of these same three TCs are described in detail. The numerical weather prediction (NWP) model used here was developed at the University of Oklahoma, and in this study it utilises initial and boundary conditions obtained from archived analyses and forecasts provided by the Australian Bureau of Meteorology, as well as a 4D-Var data assimilation scheme to ingest all available satellite data. The high-resolution numerical model is multiply two-way nested, with the innermost domain having a resolution of 5 km. It was found that unlike the operational models, which were restricted by relatively low resolution and less data, the high resolution model was able to capture most of the major features of all three TC lifecycles including development from initial tropical depressions, intensification, and their tracks, landfall, and associated rainfall and wind fields.

  1. Operations dashboard: comparative study

    NASA Astrophysics Data System (ADS)

    Ramly, Noor Nashriq; Ismail, Ahmad Zuhairi; Aziz, Mohd Haris; Ahmad, Nurul Haszeli

    2011-10-01

    In this present days and age, there are increasing needs for companies to monitor application and infrastructure health. Apart from having proactive measures to secure their application and infrastructure, many see monitoring dashboards as crucial investment in disaster preparedness. As companies struggle to find the best solution to cater for their needs and interest for monitoring their application and infrastructure's health, this paper summarizes the studies made on several known off-the-shelf operations dashboard and in-house developed dashboard. A few criteria of good dashboard are collected from previous studies carried out by several researchers and rank them according to importance and business needs. The finalized criteria that will be discussed in later sections are data visualization, performance indicator, dashboard personalization, audit capability and alert/ notification. Comparative studies between several popular dashboards were then carried out to determine whether they met these criteria that we derived from the first exercise. The findings hopefully can be used to educate and provide an overview of selecting the best IT application and infrastructure operations dashboard that suit business needs, thus become the main contribution of this paper.

  2. Two-tier Haddon matrix approach to fault analysis of accidents and cybernetic search for relationship to effect operational control: a case study at a large construction site.

    PubMed

    Mazumdar, Atmadeep; Sen, Krishna Nirmalya; Lahiri, Balendra Nath

    2007-01-01

    The Haddon matrix is a potential tool for recognizing hazards in any operating engineering system. This paper presents a case study of operational hazards at a large construction site. The fish bone structure helps to visualize and relate the chain of events, which led to the failure of the system. The two-tier Haddon matrix approach helps to analyze the problem and subsequently prescribes preventive steps. The cybernetic approach has been undertaken to establish the relationship among event variables and to identify the ones with most potential. Those event variables in this case study, based on the cybernetic concepts like control responsiveness and controllability salience, are (a) uncontrolled swing of sheet contributing to energy, (b) slippage of sheet from anchor, (c) restricted longitudinal and transverse swing or rotation about the suspension, (d) guilt or uncertainty of the crane driver, (e) safe working practices and environment. PMID:17362658

  3. An agricultural drought index to incorporate the irrigation process and reservoir operations: A case study in the Tarim River Basin

    NASA Astrophysics Data System (ADS)

    Li, Zehua; Hao, Zhenchun; Shi, Xiaogang; Déry, Stephen J.; Li, Jieyou; Chen, Sichun; Li, Yongkun

    2016-08-01

    To help the decision making process and reduce climate change impacts, hydrologically-based drought indices have been used to determine drought severity in the Tarim River Basin (TRB) over the past decades. As the major components of the surface water balance, however, the irrigation process and reservoir operations have not been incorporated into drought indices in previous studies. Therefore, efforts are needed to develop a new agricultural drought index, which is based on the Variable Infiltration Capacity (VIC) model coupled with an irrigation scheme and a reservoir module. The new drought index was derived from the simulated soil moisture data from a retrospective VIC simulation from 1961 to 2007 over the irrigated area in the TRB. The physical processes in the coupled VIC model allow the new agricultural drought index to take into account a wide range of hydrologic processes including the irrigation process and reservoir operations. Notably, the irrigation process was found to dominate the surface water balance and drought evolution in the TRB. Furthermore, the drought conditions identified by the new agricultural drought index presented a good agreement with the historical drought events that occurred in 1993-94, 2004, and 2006-07, respectively. Moreover, the spatial distribution of coupled VIC model outputs using the new drought index provided detailed information about where and to what extent droughts occurred.

  4. Operational fog collection and its role in environmental education and social reintegration: A case study in Colombia

    NASA Astrophysics Data System (ADS)

    Escobar, C. M.; Lopez, A.; Aristizabal, H. F.; Molina, J. M.

    2010-07-01

    Experimental efforts with fog collection in Colombia began eight years ago, and in recent papers we have suggested the implementation of operational fog collection as an alternative to meet water requirements in rural areas of the Andes Mountain Range. Since then, an increasing number of individuals from academia and environmental organizations in the country have shown a remarkable interest on this appropriate technology, and some started its exploration in a larger scale. In this work we describe the implementation process of the first operational fog collection project in Colombia and discuss its role in rural water supply, in environmental education issues and in the process of "social reintegration" of people who have been victims of forced displacement. Both the fog collection evaluation stage and construction and administration of the operational system involved the participation of the community of a rural village. The study zone, located in the Andes Mountains of the Valle del Cauca Department and with altitudes ranging from 2600 to 2800 meters a.s.l., has serious limitations in water availability. Eight standard fog collectors (SFC) were implemented and used during the period May/2008 - Feb/2009 in order to assess the water yield from fog. The best average monthly collection rate in the period of study was around 2.0 l.m-2.day-1. The constructed large fog collector (LFC), with a vertical collection surface of 25 m2, and the associated hydraulic system are currently managed and administered by the village inhabitants. The fog collection system benefits a rural school, and the water is mainly used in small-scale irrigation activities for horticultural crops and livestock development. The project has also brought positive impacts in the community organization, mainly comprising people who have been forced out of their rural homes by the country's nearly half-century old armed conflict. The system also allows agriculture- and environment-related issues to be

  5. Using ensemble streamflow prediction in the reservoir operation during drought by implicit and explicit stochastic optimization: case study in Shihmen Reservoir

    NASA Astrophysics Data System (ADS)

    Chou, Kuan-wen; Jiing-Yun You, Gene; Jang, Jiun-Huei

    2016-04-01

    One of the important goals of water resource management is the establishment of realistic reservoir operating policies for water allocation, especially during periods of drought. In the context of short-term (a few months) water management such as drought, we need to predict the future inflow and allocate current and future water resource to avoid severe economic loss. Because the future flow condition in uncertain, applying the stochastic optimization technique is common in guide reservoir operation. This study is trying to use the ensemble streamflow prediction (ESP) in reservoir operation during drought. We develop reservoir operation model based on two stochastic optimization frameworks, the explicit stochastic optimization (ESO) or implicit stochastic optimization (ISO). Because the forecast is updated time by time, the rolling process is adapted, the decision process is ''rolled over'' every periods and extended into the future. This study use Shihmen Reservoir as a case study. The ensemble streamflow prediction is produced and provided by National Science and Technology Center for Disaster Reduction (NCDR). Not only expect to provide an appropriate framework in integrating streamflow forecast a reservoir operation during drought, we also aim to compare the ISO and ESO to identify their advantages and disadvantages. As a result, the streamflow forecast can directly contribute, rather than just be kept in mind, in the reservoir operation during drought period.

  6. Health policy making through operative actions: a case study of provider capacity reduction in a public safety-net system.

    PubMed

    Tataw, David B

    2014-01-01

    This article describes and assesses the implications of policy decisions affecting health provider capacity in the Los Angeles County municipal safety-net health system from 1980 to 2000. Although never articulated in law or a county ordinance, the county pursued a sustained and discernable policy of cost reductions that affected capacity at King/Drew Medical Center from 1980 to 2000 without the input of beneficiaries or their advocates. Year after year, the county reduced personnel, supplies, and available beds either by reducing formal budgets or through operative actions of facility administrators that prevented the implementation of formally approved expenditures. This policy appears to have undermined the hospital system's mission of providing health services to at-risk populations with nowhere else to go. Decision making during the two decades under study revealed a decision-making pattern that challenged traditional models of policy decision making. PMID:24188297

  7. Assessment of post-operative pain in cats: a case study on veterinary students of Universiti Putra Malaysia.

    PubMed

    Lim, Mei Yan; Chen, Hui Cheng; Omar, Mohamed Ariff

    2014-01-01

    The ability to assess and control pain is listed as one of the desired Day One competencies among veterinary graduates. As such, a study was conducted to examine the current status and effectiveness of a video-based training module on the attitude toward and knowledge of pain assessment in cats among fourth- and final-year veterinary students of Universiti Putra Malaysia (UPM) in January of 2013. A total of 92 students participated in this study, resulting in a response rate of 60.1%. Upon completion of a pre-training survey, the respondents undertook an interactive video-based presentation, followed by a post-training survey. The majority of the students (96.7%) agreed on the importance of pain management. Before the training, many (76.1%) disagreed that they had received adequate training, while 53.3% were not confident in their pain-recognition skills. After training, their knowledge and confidence in pain assessment increased. Responses to the survey were not associated with differences in gender, level of study, or field of interest. Students were found to have mistaken some physiologic parameters as good pain indicators after ovariohysterectomy. Their assessment of three standardized video cases revealed that they could recognize prominent signs of pain but failed to identify changes in behavior that were more subtle. Refinement to the training module is required to address the above deficiencies. PMID:24589865

  8. Evaluating and comparing biomarkers with respect to the area under the receiver operating characteristics curve in two-phase case-control studies.

    PubMed

    Huang, Ying

    2016-07-01

    Two-phase sampling design, where biomarkers are subsampled from a phase-one cohort sample representative of the target population, has become the gold standard in biomarker evaluation. Many two-phase case-control studies involve biased sampling of cases and/or controls in the second phase. For example, controls are often frequency-matched to cases with respect to other covariates. Ignoring biased sampling of cases and/or controls can lead to biased inference regarding biomarkers' classification accuracy. Considering the problems of estimating and comparing the area under the receiver operating characteristics curve (AUC) for a binary disease outcome, the impact of biased sampling of cases and/or controls on inference and the strategy to efficiently account for the sampling scheme have not been well studied. In this project, we investigate the inverse-probability-weighted method to adjust for biased sampling in estimating and comparing AUC. Asymptotic properties of the estimator and its inference procedure are developed for both Bernoulli sampling and finite-population stratified sampling. In simulation studies, the weighted estimators provide valid inference for estimation and hypothesis testing, while the standard empirical estimators can generate invalid inference. We demonstrate the use of the analytical variance formula for optimizing sampling schemes in biomarker study design and the application of the proposed AUC estimators to examples in HIV vaccine research and prostate cancer research. PMID:26883772

  9. Utilising Enterprise Risk Management Strategies to Develop a Governance and Operations Framework for a New Research Complex: A Case Study

    ERIC Educational Resources Information Center

    Clyde-Smith, Jodi

    2014-01-01

    Enterprise risk management strategies were used to develop a regulatory and operational framework for a new multi-partner Research Institute that will house up to 900 staff from four different institutions in Queensland, Australia. The Institute will operate in a business environment while functioning as a research resource for the higher…

  10. ENVIRONMENTAL AND ENERGY BENEFITS OF MICROPROCESSOR CONTROL OF OVEN AIRFLOWS FOR A COIL COATING OPERATION: A CASE STUDY

    EPA Science Inventory

    In most industrial operations the percentage of the lower explosive limit (LEL) of VOC emissions typically remain at below 5 to 10 percent LEL at most metal coating operations. Although monitors are available to determine solvent concentration in the oven, the oven requires manua...

  11. Case Study: Writing a Journal Case Study

    ERIC Educational Resources Information Center

    Prud'homme-Genereux, Annie

    2016-01-01

    This column provides original articles on innovations in case study teaching, assessment of the method, as well as case studies with teaching notes. This month's issue describes incorporating a journal article into the classroom by first converting it into a case study.

  12. Operationally Comparable Effect Sizes for Quantifying Changes in Behavior, with Application to Meta-Analysis of Single-Case Studies

    ERIC Educational Resources Information Center

    Pustejovsky, James E.

    2013-01-01

    Single-case designs (SCDs) are a class of research methods for evaluating intervention effects by taking repeated measurements of an outcome over time on a single case, both before and after the deliberate introduction of a treatment. SCDs are used heavily in fields such as special education, school psychology, social work, and applied behavior…

  13. Optimization of Multiple and Multipurpose Reservoir System Operations by Using Matrix Structure (Case Study: Karun and Dez Reservoir Dams).

    PubMed

    Heydari, Mohammad; Othman, Faridah; Taghieh, Mahmood

    2016-01-01

    Optimal operation of water resources in multiple and multipurpose reservoirs is very complicated. This is because of the number of dams, each dam's location (Series and parallel), conflict in objectives and the stochastic nature of the inflow of water in the system. In this paper, performance optimization of the system of Karun and Dez reservoir dams have been studied and investigated with the purposes of hydroelectric energy generation and providing water demand in 6 dams. On the Karun River, 5 dams have been built in the series arrangements, and the Dez dam has been built parallel to those 5 dams. One of the main achievements in this research is the implementation of the structure of production of hydroelectric energy as a function of matrix in MATLAB software. The results show that the role of objective function structure for generating hydroelectric energy in weighting method algorithm is more important than water supply. Nonetheless by implementing ε- constraint method algorithm, we can both increase hydroelectric power generation and supply around 85% of agricultural and industrial demands. PMID:27248152

  14. Optimization of Multiple and Multipurpose Reservoir System Operations by Using Matrix Structure (Case Study: Karun and Dez Reservoir Dams)

    PubMed Central

    Othman, Faridah; Taghieh, Mahmood

    2016-01-01

    Optimal operation of water resources in multiple and multipurpose reservoirs is very complicated. This is because of the number of dams, each dam’s location (Series and parallel), conflict in objectives and the stochastic nature of the inflow of water in the system. In this paper, performance optimization of the system of Karun and Dez reservoir dams have been studied and investigated with the purposes of hydroelectric energy generation and providing water demand in 6 dams. On the Karun River, 5 dams have been built in the series arrangements, and the Dez dam has been built parallel to those 5 dams. One of the main achievements in this research is the implementation of the structure of production of hydroelectric energy as a function of matrix in MATLAB software. The results show that the role of objective function structure for generating hydroelectric energy in weighting method algorithm is more important than water supply. Nonetheless by implementing ε- constraint method algorithm, we can both increase hydroelectric power generation and supply around 85% of agricultural and industrial demands. PMID:27248152

  15. Operational Changes in a Shared Resource Laboratory with the Use of a Product Lifecycle Management Approach: A Case Study

    PubMed Central

    Smith, Victoria; Wall, Samantha

    2016-01-01

    Shared Resource Laboratories (SRLs) provide investigators access to necessary scientific and resource expertise to leverage complex technologies fully for advancing high-quality biomedical research in a cost-effective manner. At the University of Nebraska Medical Center, the Flow Cytometry Research Facility (FCRF) offered access to exceptional technology, but the methods of operation were outdated and unsustainable. Whereas technology has advanced and the institute has expanded, the operations at the facility remained unchanged for 35 yr. To rectify this, at the end of 2013, we took a product lifecycle management approach to affect large operational changes and align the services offered with the SRL goal of education, as well as to provide service to researchers. These disruptive operational changes took over 10 mo to complete and allowed for independent end-user acquisition of flow cytometry data. The results have been monitored for the past 12 mo. The operational changes have had a positive impact on the quality of research, increased investigator-facility interaction, reduced stress of facility staff, and increased overall use of the resources. This product lifecycle management approach to facility operations allowed us to conceive of, design, implement, and monitor effectively the changes at the FCRF. This approach should be considered by SRL management when faced with the need for operationally disruptive measures. PMID:26681929

  16. Operational Changes in a Shared Resource Laboratory with the Use of a Product Lifecycle Management Approach: A Case Study.

    PubMed

    Hexley, Philip; Smith, Victoria; Wall, Samantha

    2016-04-01

    Shared Resource Laboratories (SRLs) provide investigators access to necessary scientific and resource expertise to leverage complex technologies fully for advancing high-quality biomedical research in a cost-effective manner. At the University of Nebraska Medical Center, the Flow Cytometry Research Facility (FCRF) offered access to exceptional technology, but the methods of operation were outdated and unsustainable. Whereas technology has advanced and the institute has expanded, the operations at the facility remained unchanged for 35 yr. To rectify this, at the end of 2013, we took a product lifecycle management approach to affect large operational changes and align the services offered with the SRL goal of education, as well as to provide service to researchers. These disruptive operational changes took over 10 mo to complete and allowed for independent end-user acquisition of flow cytometry data. The results have been monitored for the past 12 mo. The operational changes have had a positive impact on the quality of research, increased investigator-facility interaction, reduced stress of facility staff, and increased overall use of the resources. This product lifecycle management approach to facility operations allowed us to conceive of, design, implement, and monitor effectively the changes at the FCRF. This approach should be considered by SRL management when faced with the need for operationally disruptive measures. PMID:26681929

  17. Production costs and operative margins in electric energy generation from biogas. Full-scale case studies in Italy.

    PubMed

    Riva, C; Schievano, A; D'Imporzano, G; Adani, F

    2014-08-01

    The purpose of this study was to observe the economic sustainability of three different biogas full scale plants, fed with different organic matrices: energy crops (EC), manure, agro-industrial (Plants B and C) and organic fraction of municipal solid waste (OFMSW) (Plant A). The plants were observed for one year and total annual biomass feeding, biomass composition and biomass cost (€ Mg(-1)), initial investment cost and plant electric power production were registered. The unit costs of biogas and electric energy (€ Sm(-3)biogas, € kWh(-1)EE) were differently distributed, depending on the type of feed and plant. Plant A showed high management/maintenance cost for OFMSW treatment (0.155 € Sm(-3)biogas, 45% of total cost), Plant B suffered high cost for EC supply (0.130 € Sm(-3)biogas, 49% of total cost) and Plant C showed higher impact on the total costs because of the depreciation charge (0.146 € Sm(-3)biogas, 41% of total costs). The breakeven point for the tariff of electric energy, calculated for the different cases, resulted in the range 120-170 € MWh(-1)EE, depending on fed materials and plant scale. EC had great impact on biomass supply costs and should be reduced, in favor of organic waste and residues; plant scale still heavily influences the production costs. The EU States should drive incentives in dependence of these factors, to further develop this still promising sector. PMID:24841069

  18. Enhanced genetic algorithm optimization model for a single reservoir operation based on hydropower generation: case study of Mosul reservoir, northern Iraq.

    PubMed

    Al-Aqeeli, Yousif H; Lee, T S; Abd Aziz, S

    2016-01-01

    Achievement of the optimal hydropower generation from operation of water reservoirs, is a complex problems. The purpose of this study was to formulate and improve an approach of a genetic algorithm optimization model (GAOM) in order to increase the maximization of annual hydropower generation for a single reservoir. For this purpose, two simulation algorithms were drafted and applied independently in that GAOM during 20 scenarios (years) for operation of Mosul reservoir, northern Iraq. The first algorithm was based on the traditional simulation of reservoir operation, whilst the second algorithm (Salg) enhanced the GAOM by changing the population values of GA through a new simulation process of reservoir operation. The performances of these two algorithms were evaluated through the comparison of their optimal values of annual hydropower generation during the 20 scenarios of operating. The GAOM achieved an increase in hydropower generation in 17 scenarios using these two algorithms, with the Salg being superior in all scenarios. All of these were done prior adding the evaporation (Ev) and precipitation (Pr) to the water balance equation. Next, the GAOM using the Salg was applied by taking into consideration the volumes of these two parameters. In this case, the optimal values obtained from the GAOM were compared, firstly with their counterpart that found using the same algorithm without taking into consideration of Ev and Pr, secondly with the observed values. The first comparison showed that the optimal values obtained in this case decreased in all scenarios, whilst maintaining the good results compared with the observed in the second comparison. The results proved the effectiveness of the Salg in increasing the hydropower generation through the enhanced approach of the GAOM. In addition, the results indicated to the importance of taking into account the Ev and Pr in the modelling of reservoirs operation. PMID:27390638

  19. Practice Brief: Accommodating Deaf and Hard of Hearing Students in Operating Room Environments--A Case Study

    ERIC Educational Resources Information Center

    Meeks, Lisa M.; Laird-Metke, Elisa; Rollins, Mark; Gandhi, Seema; Stechert, Martin; Jain, Neera R.

    2015-01-01

    Increasing numbers of deaf students in the health professions require accommodations in the clinical setting to ensure effective learning and accurate communication. Although classroom learning barriers have long been identified and addressed, barriers to clinical education have been far less analyzed. Operating room clerkships, which include many…

  20. Writing for Safety. Facilitating a Team Approach to Writing Operating Instructions. ANTA Leading Edge Training Case Study.

    ERIC Educational Resources Information Center

    Serle, Oenone

    The Australian engineering company, Jaques, and Swinburne University of Technology conducted a joint project to write more than 190 operating instructions for the company's 77 employees. First, the university's Workplace Skills Unit (WSU) interviewed 75 production workers to identify their language, literacy, and training needs. The WSU negotiated…

  1. Integrating an incident management system within a continuity of operations programme: case study of the Bank of Canada.

    PubMed

    Loop, Carole

    2013-01-01

    Carrying out critical business functions without interruption requires a resilient and robust business continuity framework. By embedding an industry-standard incident management system within its business continuity structure, the Bank of Canada strengthened its response plan by enabling timely response to incidents while maintaining a strong focus on business continuity. A total programme approach, integrating the two disciplines, provided for enhanced recovery capabilities. While the value of an effective and efficient response organisation is clear, as demonstrated by emergency events around the world, incident response structures based on normal operating hierarchy can experience unique challenges. The internationally-recognised Incident Command System (ICS) model addresses these issues and reflects the five primary incident management functions, each contributing to the overall strength and effectiveness of the response organisation. The paper focuses on the Bank of Canada's successful implementation of the ICS model as its incident management and continuity of operations programmes evolved to reflect current best practices. PMID:23615067

  2. Development and Execution of End-of-Mission Operations Case Study of the UARS and ERBS End-of-Mission Plans

    NASA Technical Reports Server (NTRS)

    Hughes, John; Marius, Julio L.; Montoro, Manuel; Patel, Mehul; Bludworth, David

    2006-01-01

    This Paper is a case study of the development and execution of the End-of-Mission plans for the Earth Radiation Budget Satellite (ERBS) and the Upper Atmosphere Research Satellite (UARS). The goals of the End-of-Mission Plans are to minimize the time the spacecraft remains on orbit and to minimize the risk of creating orbital debris. Both of these Missions predate the NASA Management Instructions (NMI) that directs missions to provide for safe mission termination. Each spacecrafts had their own unique challenges, which required assessing End-of-Mission requirements versus spacecraft limitations. Ultimately the End-of- Mission operations were about risk mitigation. This paper will describe the operational challenges and the lessons learned executing these End-of-Mission Plans

  3. reservoir operation and hydropower generation schemes for regional scale hydrological models: case study in the northeastern united states

    NASA Astrophysics Data System (ADS)

    Ehsani, N.; Vorosmarty, C. J.; Fekete, B. M.; Rosenzweig, B.

    2013-12-01

    As part of the development of the Northeast Regional Earth System Model (NE-RESM), we are developing an integrated hydrologic modeling framework that incorporates various aspects of the coupled human-hydrologic system, from supply to demand, into a single framework. This framework provides temporally and spatially explicit information on the regional water system under different scenarios of climate, population, and land use/ land cover change. To support these efforts, we have incorporated two new modules into the Water Balance Model (WBM) that simulate reservoir operation and calculate the hydropower production from dams. Dams and reservoirs are key characteristics of the modern hydrologic system, with a particular impact on natural stream flow, sediment flux, thermal characteristics and biogeochemical fluxes of rivers. In the Northeast Region of the United States alone, the National Inventory of Dams (NID) lists over 12000 reservoirs. Depending on site-specific characteristics of the dam, its watershed and its intended purpose, each will have a specific optimum operating rule. Since no comprehensive dataset of these operating rules exists, we have to simulate them. We developed an Artificial Neural Network and used data from 35 dams for calibration. Approximately 60 % of the dataset was dedicated to training process, 20 % to validation and the other 20 % used for testing. If (t) represents current time, we use three sets of inputs; inflow [It , It-1 , It-2], release in previous months [Rt-1 , Rt-2] and month (Mt), to calculate release from reservoir (Rt). We also used a simple continuity equation for reservoirs by considering the maximum (from NID) and minimum reservoir storage to improve the model's performance in extreme wet and dry events. Using results from WBM we show how reservoirs regionally alter discharge in streams of Northeast United States compared to their natural state. We also are assessing the effects of climate change on water availability and

  4. Case Study Teaching

    ERIC Educational Resources Information Center

    Herreid, Clyde Freeman

    2011-01-01

    This chapter describes the history of case study teaching, types of cases, and experimental data supporting their effectiveness. It also describes a model for comparing the efficacy of the various case study methods. (Contains 1 figure.)

  5. American Association of University Women: Branch Operations Data Modeling Case

    ERIC Educational Resources Information Center

    Harris, Ranida B.; Wedel, Thomas L.

    2015-01-01

    A nationally prominent woman's advocacy organization is featured in this case study. The scenario may be used as a teaching case, an assignment, or a project in systems analysis and design as well as database design classes. Students are required to document the system operations and requirements, apply logical data modeling concepts, and design…

  6. Environmental impact assessment on the construction and operation of municipal solid waste sanitary landfills in developing countries: China case study.

    PubMed

    Yang, Na; Damgaard, Anders; Lü, Fan; Shao, Li-Ming; Brogaard, Line Kai-Sørensen; He, Pin-Jing

    2014-05-01

    An inventory of material and energy consumption during the construction and operation (C&O) of a typical sanitary landfill site in China was calculated based on Chinese industrial standards for landfill management and design reports. The environmental impacts of landfill C&O were evaluated through life cycle assessment (LCA). The amounts of materials and energy used during this type of undertaking in China are comparable to those in developed countries, except that the consumption of concrete and asphalt is significantly higher in China. A comparison of the normalized impact potential between landfill C&O and the total landfilling technology implies that the contribution of C&O to overall landfill emissions is not negligible. The non-toxic impacts induced by C&O can be attributed mainly to the consumption of diesel used for daily operation, while the toxic impacts are primarily due to the use of mineral materials. To test the influences of different landfill C&O approaches on environmental impacts, six baseline alternatives were assessed through sensitivity analysis. If geomembranes and geonets were utilized to replace daily and intermediate soil covers and gravel drainage systems, respectively, the environmental burdens of C&O could be mitigated by between 2% and 27%. During the LCA of landfill C&O, the research scope or system boundary has to be declared when referring to material consumption values taken from the literature; for example, the misapplication of data could lead to an underestimation of diesel consumption by 60-80%. PMID:24656422

  7. Managing Large, Structured, and Annotated Documents: A Study of Three Operational Cases in the Field of Environmental Legislation

    NASA Astrophysics Data System (ADS)

    Treins, Michel; Louvion, Carine; Vaudelin, Jacques

    Managing legal documents, in the specific context of European environmental legislation, raise specific problems like internationalization and version management of the contents and metadata, and the need to perform tasks as consolidation, annotation, and description of the contents, at the scale of elementary fragment (article or chapter), instead of the whole document. Current standards as METS, or more specialized formats like HL7 / CDA, are not well adapted to answer these specific problems. In this paper, we present a new data model and an innovative structure of document, based on the "object" concept of descriptor. This development is now fully operational, and serves three important knowledge bases totalizing more than 11 millions of requests during the past year.

  8. Operational efficiency and sustainability of vector control of malaria and dengue: descriptive case studies from the Philippines

    PubMed Central

    2012-01-01

    Background Analysis is lacking on the management of vector control systems in disease-endemic countries with respect to the efficiency and sustainability of operations. Methods Three locations were selected, at the scale of province, municipality and barangay (i.e. village). Data on disease incidence, programme activities, and programme management were collected on-site through meetings and focus group discussions. Results Adaptation of disease control strategies to the epidemiological situation per barangay, through micro-stratification, brings gains in efficiency, but should be accompanied by further capacity building on local situational analysis for better selection and targeting of vector control interventions within the barangay. An integrated approach to vector control, aiming to improve the rational use of resources, was evident with a multi-disease strategy for detection and response, and by the use of combinations of vector control methods. Collaboration within the health sector was apparent from the involvement of barangay health workers, re-orientation of job descriptions and the creation of a disease surveillance unit. The engagement of barangay leaders and use of existing community structures helped mobilize local resources and voluntary services for vector control. In one location, local authorities and the community were involved in the planning, implementation and evaluation of malaria control, which triggered local programme ownership. Conclusions Strategies that contributed to an improved efficiency and sustainability of vector control operations were: micro-stratification, integration of vector control within the health sector, a multi-disease approach, involvement of local authorities, and empowerment of communities. Capacity building on situational analysis and vector surveillance should be addressed through national policy and guidelines. PMID:22873707

  9. Surgical extraction of lower third molars: diagnostic tests and operative technique in the prevention of inferior alveolar nerve injury. Case study

    PubMed Central

    MELEO, D.; PACIFICI, L.

    2009-01-01

    SUMMARY Increased knowledge and technical refinement have broadened the limits of outpatient oral surgery; however, these changes have at the same time led to a greater number of complications and poor outcomes and, accordingly, to legal action for professional responsibility. Oral surgery represents 10% of all actions, and almost all of these are attributable to exodontic surgery, of which around a third are related to inferior alveolar nerve injury following the extraction of lower third molars. The aim of this case study is to suggest operative technical strategies in accordance with a correct clinical-diagnostic pathway in order to prevent neurological complications involving the inferior alveolar nerve subsequent to lower third molar extraction. Cases should be carefully selected and surgical intervention undertaken solely when genuinely necessary. The patient should be informed of the risks, the methods and the possible results of the treatment. These are the bases for correct indication, along with a sufficient diagnostic path and a good level of communication between operator and patient. PMID:23285341

  10. Evaluation of an operational streamflow forecasting system driven by ensemble precipitation forecasts : a case study for the Gatineau watershed

    NASA Astrophysics Data System (ADS)

    Boucher, M.-A.; Perreault, L.; Tremblay, D.; Gaudet, J.; Minville, M.; Anctil, F.

    2009-04-01

    Among the various sources of uncertainty for hydrological forecasts, the uncertainty linked to meteorological inputs prevail. Precipitation is particularly difficult to forecast and observed values are often poor representation of the true precipitation field. In order to account for the uncertainty related to precipitation data, it can be interesting to produce ensemble streamflow forecasts by feeding a hydrological model with ensemble precipitation forecasts issued by atmospheric models. In this study, we use ensemble precipitation forecasts to drive Hydrotel, a distributed hydrological model. We concentrate on the Gatineau watershed, which serves as an experimental watershed for Hydro-Québec, the major hydropower producer in Quebec. The main goal of this study is to demonstrate that ensemble precipitation forecasts can improve streamflow forecasting for the watershed of interest. The ensemble precipitation forecasts were produced by Environnement Canada from march first of 2002 to december 31st of 2003. They were obtained using two atmospheric models, SEF (8 members plus the control deterministic forecast) and GEM (8 members). The corresponding deterministic precipitation forecast issued by SEF model is also used with Hydrotel in order to compare ensemble streamflow forecasts with their deterministic counterparts. The quality of the precipitation forecasts is first assessed, using the continuous ranked probability score (CRPS), the logarithmic score, rank histograms and reliability diagrams. The performance of the corresponding streamflow forecasts obtained at the end of the process is also evaluated using the same quality assessment tools.

  11. Status of international co-operation. Case study: Elucidation of the cause and control of second impurity pattern in semiconductors

    NASA Astrophysics Data System (ADS)

    Nishinaga, Tatau

    1992-01-01

    Cause and control of the 2nd impurity patterns in tellurium doped gallium antimonide and sulfur doped indium phosphide semiconductors were studied. The semiconductors were made using the Travelling Heater Method (THM) on Spacelab SL-1 (1983) and D-1 (1985). Samples were chemically etched and observed by spatial resolution photo luminescence method. As a result, the condition to control the formation of the 2nd impurity pattern is elucidated, and crystal growth without 1st or 2nd impurity patterns can be obtained using the THM method in microgravity. Methods to remove the macrosteps formed by LPE (Liquid Phase Epitaxy), which is a method for the formation of semiconductor thin solids, are found. It is made clear that the latter result is attributable to ground technology improvement yielded by analyzing experiments in microgravity. It is made clear that accurate research on the formation and disappearance of 2nd impurity patterns and accurate measurement of physical constants, such as the diffusion coefficient, are possible in microgravity conditions due to lack of thermal convection.

  12. Rapid assessment of environmental health risks posed by mining operations in low- and middle-income countries: selected case studies.

    PubMed

    Caravanos, Jack; Ericson, Bret; Ponce-Canchihuamán, Johny; Hanrahan, David; Block, Meredith; Susilorini, Budi; Fuller, Richard

    2013-11-01

    Previous studies have evaluated associated health risks and human exposure pathways at mining sites. Others have provided estimates of the scale of the issue based in part on surveys. However, a global census of mining-related hazardous waste sites has been lacking. The Toxic Sites Identification Program (TSIP) implemented by Blacksmith Institute (New York, NY, USA) since 2009 is an ongoing effort to catalogue a wide range of chemically contaminated sites with a potential human health risk (Ericson et al., Environ Monit Assess doi:10.1007/s 10661-012-2665-2, 2012). The TSIP utilizes a rapid assessment instrument, the Initial Site Screening (ISS), to quickly and affordably identify key site criteria including human exposure pathways, estimated populations at risk, and sampling information. The resulting ISS allows for comparison between sites exhibiting different contaminants and pollution sources. This paper explores the results of a subset of ISSs completed at 131 artisanal and small-scale gold mining areas and 275 industrial mining and ore processing sites in 45 countries. The authors show that the ISS captures key data points, allowing for prioritization of sites for further investigation or remedial activity. PMID:23263764

  13. A new prognostic clinicopathological classification of pituitary adenomas: a multicentric case-control study of 410 patients with 8 years post-operative follow-up.

    PubMed

    Trouillas, Jacqueline; Roy, Pascal; Sturm, Nathalie; Dantony, Emmanuelle; Cortet-Rudelli, Christine; Viennet, Gabriel; Bonneville, Jean-François; Assaker, Richard; Auger, Carole; Brue, Thierry; Cornelius, Aurélie; Dufour, Henry; Jouanneau, Emmanuel; François, Patrick; Galland, Françoise; Mougel, François; Chapuis, François; Villeneuve, Laurent; Maurage, Claude-Alain; Figarella-Branger, Dominique; Raverot, Gérald; Barlier, A; Bernier, M; Bonnet, F; Borson-Chazot, F; Brassier, G; Caulet-Maugendre, S; Chabre, O; Chanson, P; Cottier, J F; Delemer, B; Delgrange, E; Di Tommaso, L; Eimer, S; Gaillard, S; Jan, M; Girard, J J; Lapras, V; Loiseau, H; Passagia, J G; Patey, M; Penfornis, A; Poirier, J Y; Perrin, G; Tabarin, A

    2013-07-01

    Pituitary adenomas are currently classified by histological, immunocytochemical and numerous ultrastructural characteristics lacking unequivocal prognostic correlations. We investigated the prognostic value of a new clinicopathological classification with grades based on invasion and proliferation. This retrospective multicentric case-control study comprised 410 patients who had surgery for a pituitary tumour with long-term follow-up. Using pituitary magnetic resonance imaging for diagnosis of cavernous or sphenoid sinus invasion, immunocytochemistry, markers of the cell cycle (Ki-67, mitoses) and p53, tumours were classified according to size (micro, macro and giant), type (PRL, GH, FSH/LH, ACTH and TSH) and grade (grade 1a: non-invasive, 1b: non-invasive and proliferative, 2a: invasive, 2b: invasive and proliferative, and 3: metastatic). The association between patient status at 8-year follow-up and age, sex, and classification was evaluated by two multivariate analyses assessing disease- or recurrence/progression-free status. At 8 years after surgery, 195 patients were disease-free (controls) and 215 patients were not (cases). In 125 of the cases the tumours had recurred or progressed. Analyses of disease-free and recurrence/progression-free status revealed the significant prognostic value (p < 0.001; p < 0.05) of age, tumour type, and grade across all tumour types and for each tumour type. Invasive and proliferative tumours (grade 2b) had a poor prognosis with an increased probability of tumour persistence or progression of 25- or 12-fold, respectively, as compared to non-invasive tumours (grade 1a). This new, easy to use clinicopathological classification of pituitary endocrine tumours has demonstrated its prognostic worth by strongly predicting the probability of post-operative complete remission or tumour progression and so could help clinicians choose the best post-operative therapy. PMID:23400299

  14. Case Studies Behavior Modification.

    ERIC Educational Resources Information Center

    Wark, David M.

    The case histories of five students enrolled in a university course in how to study are reported. The students ranged in age from 18 to 35, included two males and three females, and varied in school experience from no college in one case and some college in two cases to college degrees in two cases. Students were initially taught to chart their…

  15. The Case for Addressing Operator Fatigue

    PubMed Central

    Duffy, Jeanne F.; Zitting, Kirsi-Marja; Czeisler, Charles A.

    2015-01-01

    Sleep deficiency, which can be caused by acute sleep deprivation, chronic insufficient sleep, untreated sleep disorders, disruption of circadian timing, and other factors, is endemic in the U.S., including among professional and non-professional drivers and operators. Vigilance and attention are critical for safe transportation operations, but fatigue and sleepiness compromise vigilance and attention by slowing reaction times and impairing judgment and decision-making abilities. Research studies, polls, and accident investigations indicate that many Americans drive a motor vehicle or operate an aircraft, train or marine vessel while drowsy, putting themselves and others at risk for error and accident. In this chapter, we will outline some of the factors that contribute to sleepiness, present evidence from laboratory and field studies demonstrating how sleepiness impacts transportation safety, review how sleepiness is measured in laboratory and field settings, describe what is known about interventions for sleepiness in transportation settings, and summarize what we believe are important gaps in our knowledge of sleepiness and transportation safety. PMID:26056516

  16. The case study approach

    PubMed Central

    2011-01-01

    The case study approach allows in-depth, multi-faceted explorations of complex issues in their real-life settings. The value of the case study approach is well recognised in the fields of business, law and policy, but somewhat less so in health services research. Based on our experiences of conducting several health-related case studies, we reflect on the different types of case study design, the specific research questions this approach can help answer, the data sources that tend to be used, and the particular advantages and disadvantages of employing this methodological approach. The paper concludes with key pointers to aid those designing and appraising proposals for conducting case study research, and a checklist to help readers assess the quality of case study reports. PMID:21707982

  17. Case Studies in Broadcast Management.

    ERIC Educational Resources Information Center

    Coleman, Howard W.

    This collection of case studies, based on factual situations which have challenged broadcast managers in recent years, is designed to stimulate thinking about and solving of "real world" problems in commercial radio and television operations. Topics of a serious, long-run nature include enlarging the radio audience; station revenue and economy;…

  18. [Qualitative case study].

    PubMed

    Debout, Christophe

    2016-06-01

    The qualitative case study is a research method which enables a complex phenomenon to be explored through the identification of different factors interacting with each other. The case observed is a real situation. In the field of nursing science, it may be a clinical decision-making process. The study thereby enables the patient or health professional experience to be conceptualised. PMID:27338694

  19. SETDA Case Studies 2012

    ERIC Educational Resources Information Center

    State Educational Technology Directors Association, 2012

    2012-01-01

    The State Educational Technology Directors Association (SETDA) published a series of case studies from 28 states to showcase examples of how ARRA EETT ("American Recovery and Reinvestment Act of 2009 Enhancing Education Through Technology") grant funds have impacted teaching and learning. SETDA collected data for the case studies through a variety…

  20. A three-step approach for the derivation and validation of high-performing predictive models using an operational dataset: congestive heart failure readmission case study

    PubMed Central

    2014-01-01

    Background The aim of this study was to propose an analytical approach to develop high-performing predictive models for congestive heart failure (CHF) readmission using an operational dataset with incomplete records and changing data over time. Methods Our analytical approach involves three steps: pre-processing, systematic model development, and risk factor analysis. For pre-processing, variables that were absent in >50% of records were removed. Moreover, the dataset was divided into a validation dataset and derivation datasets which were separated into three temporal subsets based on changes to the data over time. For systematic model development, using the different temporal datasets and the remaining explanatory variables, the models were developed by combining the use of various (i) statistical analyses to explore the relationships between the validation and the derivation datasets; (ii) adjustment methods for handling missing values; (iii) classifiers; (iv) feature selection methods; and (iv) discretization methods. We then selected the best derivation dataset and the models with the highest predictive performance. For risk factor analysis, factors in the highest-performing predictive models were analyzed and ranked using (i) statistical analyses of the best derivation dataset, (ii) feature rankers, and (iii) a newly developed algorithm to categorize risk factors as being strong, regular, or weak. Results The analysis dataset consisted of 2,787 CHF hospitalizations at University of Utah Health Care from January 2003 to June 2013. In this study, we used the complete-case analysis and mean-based imputation adjustment methods; the wrapper subset feature selection method; and four ranking strategies based on information gain, gain ratio, symmetrical uncertainty, and wrapper subset feature evaluators. The best-performing models resulted from the use of a complete-case analysis derivation dataset combined with the Class-Attribute Contingency Coefficient

  1. Application of Decision Tree to Obtain Optimal Operation Rules for Reservoir Flood Control Considering Sediment Desilting-Case Study of Tseng Wen Reservoir

    NASA Astrophysics Data System (ADS)

    ShiouWei, L.

    2014-12-01

    Reservoirs are the most important water resources facilities in Taiwan.However,due to the steep slope and fragile geological conditions in the mountain area,storm events usually cause serious debris flow and flood,and the flood then will flush large amount of sediment into reservoirs.The sedimentation caused by flood has great impact on the reservoirs life.Hence,how to operate a reservoir during flood events to increase the efficiency of sediment desilting without risk the reservoir safety and impact the water supply afterward is a crucial issue in Taiwan.  Therefore,this study developed a novel optimization planning model for reservoir flood operation considering flood control and sediment desilting,and proposed easy to use operating rules represented by decision trees.The decision trees rules have considered flood mitigation,water supply and sediment desilting.The optimal planning model computes the optimal reservoir release for each flood event that minimum water supply impact and maximum sediment desilting without risk the reservoir safety.Beside the optimal flood operation planning model,this study also proposed decision tree based flood operating rules that were trained by the multiple optimal reservoir releases to synthesis flood scenarios.The synthesis flood scenarios consists of various synthesis storm events,reservoir's initial storage and target storages at the end of flood operating.  Comparing the results operated by the decision tree operation rules(DTOR) with that by historical operation for Krosa Typhoon in 2007,the DTOR removed sediment 15.4% more than that of historical operation with reservoir storage only8.38×106m3 less than that of historical operation.For Jangmi Typhoon in 2008,the DTOR removed sediment 24.4% more than that of historical operation with reservoir storage only 7.58×106m3 less than that of historical operation.The results show that the proposed DTOR model can increase the sediment desilting efficiency and extend the

  2. Case studies of unique problems and events encountered during design, construction, and operation of three large commercial-scale fuel ethanol plants

    SciTech Connect

    Jones, K.W.

    1984-01-01

    This paper summarizes the unique problems and events encountered during the design, construction, start-up, and operation phases of three differently constructed alcohol fuel projects. These projects were awarded cost sharing contracts (Cooperative Agreements) as part of the Department of Energy's effort to expedite ethanol production on a commercial scale. The scope of the projects included final design, economic and financial analysis, market analysis, environmental analysis, facility construction, and plant start-up operation. The three ethanol plants are a 20-million gallon per year (MMGPY) new-construction or grass roots facility; a 60-MMGPY plant constructed using refurbished equipment at a decommissioned ammonia fertilizer facility; and a 10-MMGPY retrofitted brewery. A comparison of the case histories of these projects clearly points out the advantages and disadvantages of each type of design and construction.

  3. Debriefing of American Red Cross personnel: pilot study on participants' evaluations and case examples from the 1994 Los Angeles earthquake relief operation.

    PubMed

    Armstrong, K; Zatzick, D; Metzler, T; Weiss, D S; Marmar, C R; Garma, S; Ronfeldt, H; Roepke, L

    1998-01-01

    The Multiple Stressor Debriefing (MSD) model was used to debrief 112 American Red Cross workers individually or in groups after their participation in the 1994 Los Angeles earthquake relief effort. Two composite case examples are presented that illustrate individual and group debriefings using the MSD model. A questionnaire which evaluated workers' experience of debriefing, was completed by 95 workers. Results indicated that workers evaluated the debriefings in which they participated positively. In addition, as participant to facilitator ratio increased, workers shared less of their feelings and reactions about the disaster relief operation. These findings, as well as more specific issues about debriefing, are discussed. PMID:9579015

  4. MULTIPLE CONTAMINANTS CASE STUDIES

    EPA Science Inventory

    The presentation provides information taken from the arsenic demonstration program projects that have treatment systems removing multiply contaminants from drinking water. The case studies sited in the presentation consist of projects that have arsenic along with either nitrate, ...

  5. Laos case study

    PubMed Central

    2012-01-01

    Peuan Mit is a Lao organization working to address the needs of children and youth living and working on the streets. This case study outlines how a trusted and strong relationship with local police provides mutual benefit. PMID:22769869

  6. HYDROGEOLOGIC CASE STUDIES

    EPA Science Inventory

    Hydrogeology is the foundation of subsurface site characterization for evaluations of monitored natural attenuation (MNA). Three case studies are presented. Examples of the potentially detrimental effects of drilling additives on ground-water samples from monitoring wells are d...

  7. Space station operating system study

    NASA Technical Reports Server (NTRS)

    Horn, Albert E.; Harwell, Morris C.

    1988-01-01

    The current phase of the Space Station Operating System study is based on the analysis, evaluation, and comparison of the operating systems implemented on the computer systems and workstations in the software development laboratory. Primary emphasis has been placed on the DEC MicroVMS operating system as implemented on the MicroVax II computer, with comparative analysis of the SUN UNIX system on the SUN 3/260 workstation computer, and to a limited extent, the IBM PC/AT microcomputer running PC-DOS. Some benchmark development and testing was also done for the Motorola MC68010 (VM03 system) before the system was taken from the laboratory. These systems were studied with the objective of determining their capability to support Space Station software development requirements, specifically for multi-tasking and real-time applications. The methodology utilized consisted of development, execution, and analysis of benchmark programs and test software, and the experimentation and analysis of specific features of the system or compilers in the study.

  8. Selection, Evaluation, and Modification of a Standard Operating Procedure as a Mechanism for Introducing an Undergraduate Student to Chemical Research: A Case Study

    ERIC Educational Resources Information Center

    Claycomb, Gregory D.; Venable, Frances A.

    2015-01-01

    In an effort to broaden the selection of research opportunities available to a student registered in a one-semester, upper-level independent study course at a primarily undergraduate institution (PUI), a highly motivated student was asked to select, evaluate, and modify a standard operating procedure (SOP). The student gained valuable experience…

  9. Post-myocardial infarction ventricular septal defect. Is it better to operate on a fresh infarction or to wait? A case study

    PubMed Central

    Suder, Bogdan; Janik, Łukasz; Wasilewski, Grzegorz; Konstanty-Kalandyk, Janusz; Sadowski, Jerzy; Kapelak, Bogusław; Ceranowicz, Piotr

    2016-01-01

    The authors present case studies of two patients, aged 76 and 77, who were diagnosed with fresh post-myocardial infarction ventricular septal defects (VSD) and were admitted for urgent surgical intervention. The report is a comment in the discussion concerning the optimal time for surgical intervention. PMID:27212977

  10. Cardiopulmonary exercise testing screening and pre-operative pulmonary rehabilitation reduce postoperative complications and improve fast-track recovery after lung cancer surgery: A study for 342 cases

    PubMed Central

    Gao, Ke; Yu, Peng-ming; Su, Jian-hua; He, Cheng-qi; Liu, Lun-xu; Zhou, Yu-bin; Pu, Qiang; Che, Guo-wei

    2015-01-01

    Background An evaluation of cardiopulmonary exercise testing (CPET) screening and pre-operative pulmonary rehabilitation in reducing postoperative complications and improving fast-track recovery in high-risk patients who undergo resection for lung cancer. Methods Of 342 potential lung cancer cases, 142 high-risk patients were finally divided into two groups: group R (n = 71) underwent an intensive pre-operative pulmonary rehabilitation program (PRP), followed by lobectomy; group S (n = 71) underwent only lobectomy with conventional management. Postoperative complications, average days in hospital, postoperative days in hospital, and cost were analyzed. Results The 142 high-risk patients were screened by smoking history and CPET. Sixty-eight patients had bronchial hyperresponsiveness (BHR) and 47 patients had peak expiratory flow <250 L/minute by CPET. The rate of postoperative total complications in group R (16.90%) was significantly lower than in group S (83.31%) (P = 0.00), as was the rate of postoperative pulmonary complications PPC: group R (12.81%) versus S (13.55%) (P = 0.009); the PPC in the left lung (17.9%) was higher than in the right lung (2.3%) (P = 0.00). The average days in hospital in group S was significantly higher than in group R (P = 0.03). There was no difference between groups in average hospital cost (P = 0.304). Conclusion Pre-operative screening using CPET is conducive to identifying high-risk patients for lung resection. Pre-operative pulmonary rehabilitation is helpful to reduce postoperative complications and improve fast-track recovery. PMID:26273399

  11. Integrated Operations Architecture Technology Assessment Study

    NASA Technical Reports Server (NTRS)

    2001-01-01

    As part of NASA's Integrated Operations Architecture (IOA) Baseline, NASA will consolidate all communications operations. including ground-based, near-earth, and deep-space communications, into a single integrated network. This network will make maximum use of commercial equipment, services and standards. It will be an Internet Protocol (IP) based network. This study supports technology development planning for the IOA. The technical problems that may arise when LEO mission spacecraft interoperate with commercial satellite services were investigated. Commercial technology and services that could support the IOA were surveyed, and gaps in the capability of existing technology and techniques were identified. Recommendations were made on which gaps should be closed by means of NASA research and development funding. Several findings emerged from the interoperability assessment: in the NASA mission set, there is a preponderance of small. inexpensive, low data rate science missions; proposed commercial satellite communications services could potentially provide TDRSS-like data relay functions; and. IP and related protocols, such as TCP, require augmentation to operate in the mobile networking environment required by the space-to-ground portion of the IOA. Five case studies were performed in the technology assessment. Each case represented a realistic implementation of the near-earth portion of the IOA. The cases included the use of frequencies at L-band, Ka-band and the optical spectrum. The cases also represented both space relay architectures and direct-to-ground architectures. Some of the main recommendations resulting from the case studies are: select an architecture for the LEO/MEO communications network; pursue the development of a Ka-band space-qualified transmitter (and possibly a receiver), and a low-cost Ka-band ground terminal for a direct-to-ground network, pursue the development of an Inmarsat (L-band) space-qualified transceiver to implement a global, low

  12. Moving-bed gasification - combined-cycle control study. Volume 1: results and conclusions, Case 1 - air-blown dry-ash operation. Final report

    SciTech Connect

    Ahner, D.J.; Brower, A.S.; Dawes, M.H.; Patel, A.S.

    1981-03-01

    A simulation study has been conducted to investigate the inherent process dynamics and required control strategies for an integrated coal gasification/combined cycle (GCC) power plant to operate successfully under load-changing conditions to meet power system requirements. The simulated GCC plant configuration is similar to the flowsheet developed in earlier EPRI economic studies (RP239), based on an air-blown, dry-ash, moving-bed gasifier of the Lurgi-type. A following GCC plant control study will be based on a Lurgi-type gasifier modified for oxygen-blown, slagging operations such as that being developed by British Gas Corporation. A large ditial computer simulation model of the GCC plant operating on a large utility power system network was developed to examine alternate plant control strategies. Gas turbine-lead and gasifier-lead control modes were evaluated with respect to power system requirements for daily load following, tie-line flow regulation with thermal backup, and frequency regulation. Inherent features of the gasifier led to unique process dynamics for the GCC plant. Sizeable transients were observed during load-changing operations, both in the fuel process and the steam system. However, the plant compensated effectively for such transients with a modified gas turbine-lead control strategy, by making use of fast-responding gas turbine controls and the large inherent volume of the fuel process. The results verify the capability of the GCC plant to operate with the fuel process closely integrated with the combined cycle plant under rapidly changing conditions. Furthermore, a GCC plant control strategy was developed which can successfully meet power sytem requirements within fuel system limitations, allowing an overall plant response rate of four (4) percent per minute.

  13. Estimating irrigation water demand using an improved method and optimizing reservoir operation for water supply and hydropower generation: a case study of the Xinfengjiang reservoir in southern China

    USGS Publications Warehouse

    Wu, Yiping; Chen, Ji

    2013-01-01

    The ever-increasing demand for water due to growth of population and socioeconomic development in the past several decades has posed a worldwide threat to water supply security and to the environmental health of rivers. This study aims to derive reservoir operating rules through establishing a multi-objective optimization model for the Xinfengjiang (XFJ) reservoir in the East River Basin in southern China to minimize water supply deficit and maximize hydropower generation. Additionally, to enhance the estimation of irrigation water demand from the downstream agricultural area of the XFJ reservoir, a conventional method for calculating crop water demand is improved using hydrological model simulation results. Although the optimal reservoir operating rules are derived for the XFJ reservoir with three priority scenarios (water supply only, hydropower generation only, and equal priority), the river environmental health is set as the basic demand no matter which scenario is adopted. The results show that the new rules derived under the three scenarios can improve the reservoir operation for both water supply and hydropower generation when comparing to the historical performance. Moreover, these alternative reservoir operating policies provide the flexibility for the reservoir authority to choose the most appropriate one. Although changing the current operating rules may influence its hydropower-oriented functions, the new rules can be significant to cope with the increasingly prominent water shortage and degradation in the aquatic environment. Overall, our results and methods (improved estimation of irrigation water demand and formulation of the reservoir optimization model) can be useful for local watershed managers and valuable for other researchers worldwide.

  14. Geothermal Case Studies

    DOE Data Explorer

    Young, Katherine

    2014-09-30

    database.) In fiscal year 2015, NREL is working with universities to populate additional case studies on OpenEI. The goal is to provide a large enough dataset to start conducting analyses of exploration programs to identify correlations between successful exploration plans for areas with similar geologic occurrence models.

  15. Case Studies in Biology.

    ERIC Educational Resources Information Center

    Zeakes, Samuel J.

    1989-01-01

    A case study writing exercise used in a course on parasitology was found to be a powerful learning experience for students because it involved discipline-based technical writing and terminology, brought the students in as evaluators, applied current learning, caused interaction among all students, and simulated real professional activities. (MSE)

  16. A Case Study on Investigating the Effect of Genetic Algorithm Operators on Predicting the Global Minimum Hardness Value of Biomaterial Extrudate

    SciTech Connect

    Shankar, T.J.; Sokhansanj, Shahabaddine

    2010-02-01

    Crossover and mutation are the main search operators of genetic algorithm, one of the most important features which distinguish it from other search algorithms like simulated annealing. A genetic algorithm adopts crossover and mutation as their main genetic operators. The present work was aimed to see the effect of genetic algorithm operators like crossover and mutation (Pc & Pm), population size (n), and number of iterations (I) on predicting the minimum hardness (N) of the biomaterial extrudate. The second order polynomial regression equation developed for the extrudate property hardness in terms of the independent variables like barrel temperature, screw speed, fish content of the feed, and feed moisture content was used as the objective function in the GA analysis. A simple genetic algorithm (SGA) with a crossover and mutation operators was used in the present study. A program was developed in C language for a SGA with a rank based fitness selection method. The upper limit of population and iterations were fixed at 100. It was observed that increasing population and iterations the prediction of function minimum improved drastically. Minimum predicted hardness values were achievable with a medium population of 50, iterations of 50 and crossover and mutation probabilities of 50 % and 0.5 %. Further the Pareto charts indicated that the effect of Pc was found to be more significant when population is 50 and Pm played a major role at low population ( 10). A crossover probability of 50 % and mutation probability of 0.5 % are the threshold values for the convergence of GA to reach a global search space. A minimum predicted hardness value of 3.82 (N) was observed for n = 60 and I = 100 and Pc & Pm of 85 % and 0.5 %.

  17. Industrial cogeneration case studies

    NASA Astrophysics Data System (ADS)

    Limaye, D. R.; Isser, S.; Hinkle, B.; Friedman, N. R.

    1980-09-01

    Studies were performed on a number of operating cogeneration systems to determine application, economics, and attitudes of industrial and utility executives toward cogeneration. A literature survey was conducted and an identification of candidate cogeneration sites was carried out. This was followed by a screening of these sites down to 20 to 30 candidate sites. The screening was carried out on the basis of cogeneration capacity, geographical diversity, generation type, and industrial diversity. The remaining sites were contacted as to their willingness to work with EPRI, and an industrial questionnaire was developed on technical, economic, and institutional cogeneration issues. Each of the seventeen sites was visited during this task. A utility questionnaire was developed and utilities with cogeneration systems studied in this survey were contacted as to their attitudes toward cogeneration. In addition, a compilation of a list of operating cogeneration systems was performed.

  18. The FAST-T approach for operational, real time, short term hydrological forecasting: Results from the Betania Hydropower Reservoir case study

    NASA Astrophysics Data System (ADS)

    Domínguez, Efraín; Angarita, Hector; Rosmann, Thomas; Mendez, Zulma; Angulo, Gustavo

    2013-04-01

    A viable quantitative hydrological forecasting service is a combination of technological elements, personnel and knowledge, working together to establish a stable operational cycle of forecasts emission, dissemination and assimilation; hence, the process for establishing such system usually requires significant resources and time to reach an adequate development and integration in order to produce forecasts with acceptable levels of performance. Here are presented the results of this process for the recently implemented Operational Forecast Service for the Betania's Hydropower Reservoir - or SPHEB, located at the Upper-Magdalena River Basin (Colombia). The current scope of the SPHEB includes forecasting of water levels and discharge for the three main streams affluent to the reservoir, for lead times between +1 to +57 hours, and +1 to +10 days. The core of the SPHEB is the Flexible, Adaptive, Simple and Transient Time forecasting approach, namely FAST-T. This comprises of a set of data structures, mathematical kernel, distributed computing and network infrastructure designed to provide seamless real-time operational forecast and automatic model adjustment in case of failures in data transmission or assimilation. Among FAST-T main features are: an autonomous evaluation and detection of the most relevant information for the later configuration of forecasting models; an adaptively linearized mathematical kernel, the optimal adaptive linear combination or OALC, which provides a computationally simple and efficient algorithm for real-time applications; and finally, a meta-model catalog, containing prioritized forecast models at given stream conditions. The SPHEB is at present feed by the fraction of hydrological monitoring network installed at the basin that has telemetric capabilities via NOAA-GOES satellites (8 stages, approximately 47%) with data availability of about a 90% at one hour intervals. However, there is a dense network of 'conventional' hydro

  19. Atrial fibrillation case study.

    PubMed

    Johnson, Sarah; Wilson, Tracey

    2016-03-01

    This article discusses the irregular heart rhythm caused by atrial fibrillation (AF). A brief overview of the pathophysiology will be provided. A case study is discussed to highlight the treatment and management of AF. The care provision describes common signs and symptoms and also the treatment and management of AF within the maternity care setting. The importance of maintaining the mother-baby dyad is highlighted. For the purpose of maintaining confidentiality the woman will be referred to as Shama. PMID:27044188

  20. TDRSS operations control analysis study

    NASA Technical Reports Server (NTRS)

    1976-01-01

    The use of an operational Tracking and Data Relay Satellite System (TDRSS) and the remaining ground stations for the STDN (GSTDN) was investigated. The operational aspects of TDRSS concepts, GSTDN as a 14-site network, and GSTDN as a 7 site-network were compared and operations control concepts for the configurations developed. Man/machine interface, scheduling system, and hardware/software tradeoff analyses were among the factors considered in the analysis.

  1. Signal level statistics and case studies for an over-the-horizon mid-Atlantic coastal link operating at C-band

    NASA Astrophysics Data System (ADS)

    Goldhirsh, Julius; Musiani, Bert H.

    1999-03-01

    We examine the results of 1 year of near-continuous measurements for a 128-km over-the-horizon C-band coastal propagation link. The link extends between Dam Neck, Virginia (16 km south of Virginia Beach), and Wallops Island, Virginia (approximately 150 km southeast of Washington, D. C.). The objectives of this effort are to explore the different mechanisms of propagation through an analysis of several case studies and to assess the statistical connectivity over the 1-year period. Case studies involving the linking of environmental information and measured signal levels are analyzed. Propagation factor levels due to evaporation ducts, surface ducts, and scattering from irregularities of the refractive index in the common volume are determined. Cumulative distributions of the measured propagation factor for the annual, fall-winter, and spring-summer periods are presented. Conditional and absolute distributions of propagation factor time durations are also presented and analyzed. It is demonstrated that during the spring-summer period, received signal levels were consistent with ducting and not with troposcatter. The fall-winter levels may be due to troposcatter from irregularities of the refractive index. The months giving the smallest and largest propagation factors were January and June, respectively.

  2. Succession of phytoplankton assemblages in response to large-scale reservoir operation: a case study in a tributary of the Three Gorges Reservoir, China.

    PubMed

    Xiao, Yan; Li, Zhe; Guo, Jinsong; Fang, Fang; Smith, Val H

    2016-03-01

    The Three Gorges Dam (TGD) has greatly altered ecological and environmental conditions within the reservoir region, but it is not known how these changes affect phytoplankton structure and dynamics. Here, a bimonthly monitoring program was implemented from 2007 to 2009 to study the impact of damming on phytoplankton assemblages in the backwater area of the Pengxi River (PBA). By application of the phytoplankton functional group (C strategists, competitive species; S strategists, stress-tolerant species; R strategists, rapid propagation species), seasonal changes in phytoplankton relative to environmental variations were evaluated using ordination analysis. Seasonal patterns of phytoplankton dynamics were detected during this study, with CS/S strategists causing algal blooms from mid-spring to early summer, CS/CR strategists often observed during flood season, and CS strategists dominant during mid-autumn. CR/R groups dominated during winter and caused algal blooms in February. Our results indicated that phytoplankton assemblages were directly related to reservoir operation effects. Generally, the TGD had a low water level during flood season, resulting in a relatively short hydraulic retention time and intensive variability, which supported the cooccurrence of CS and CR species. During the winter drought season, water storage in the TGD increased the water level and the hydraulic retention time in the PBA, enabling R/CR strategists to overcome the sedimentation effect and to out-compete S/CS species in winter. As expected, these diversity patterns were significantly correlated with the hydraulic retention time and nutrient limitation pattern in the PBA. This study provides strategic insight for evaluating the impacts of reservoir operations on phytoplankton adaptation. PMID:26861743

  3. An Ionospheric Metric Study Using Operational Models

    NASA Astrophysics Data System (ADS)

    Sojka, J. J.; Schunk, R. W.; Thompson, D. C.; Scherliess, L.; Harris, T. J.

    2006-12-01

    One of the outstanding challenges in upgrading ionospheric operational models is quantifying their improvement. This challenge is not necessarily an absolute accuracy one, but rather answering the question, "Is the newest operational model an improvement over its predecessor under operational scenarios?" There are few documented cases where ionospheric models are compared either with each other or against "ground truth". For example a CEDAR workshop team, PRIMO, spent almost a decade carrying out a models comparison with ionosonde and incoherent scatter radar measurements from the Millstone Hill, Massachusetts location [Anderson et al.,1998]. The result of this study was that all models were different and specific conditions could be found when each was the "best" model. Similarly, a National Space Weather Metrics ionospheric challenge was held and results were presented at a National Space Weather meeting. The results were again found to be open to interpretation, and issues with the value of the specific metrics were raised (Fuller-Rowell, private communication, 2003). Hence, unlike the tropospheric weather community, who have established metrics and exercised them on new models over many decades to quantify improvement, the ionospheric community has not yet settled on a metric of both scientific and operational value. We report on a study in which metrics were used to compare various forms of the International Reference Ionosphere (IRI), the Ionospheric Forecast Model (IFM), and the Utah State University Global Assimilation of Ionospheric Measurements Model (USU-GAIM) models. The ground truth for this study was a group of 11 ionosonde data sets taken between 20 March and 19 April 2004. The metric parameter was the ionosphere's critical frequency. The metric was referenced to the IRI. Hence, the study addressed the specific question what improvement does IFM and USU-GAIM have over IRI. Both strengths (improvements) and weaknesses of these models are discussed

  4. Rainfall events and soil moisture deviations as detected by operational ASCAT soil moisture data: case study in semi-arid regions of Somalia

    NASA Astrophysics Data System (ADS)

    Doubkova, M.; Bartsch, A.; Wagner, W.

    2009-04-01

    Large and widely dispersed populations in Somalia depend on pastoralism and on rainfed and irrigated farming. Droughts and floods that have plagued the country in the course of its history were critical for the herders and farmers and have often initiated long-lasting food crises. Recently, the Somalia Water and Land Information Management (SWALIM) has initiated collaborative activities to identify and quantify the physical causes of drought for better understanding of this phenomenon and better addressing the humanitarian aid in Somalia. The soil moisture was identified as one of the parameter that may improve the drought assessment studies in Somalia. The poor accessibility and long-lasting conflicts in Somalia region caused periods of missing values in the meteorological networks that complicate or disable further weather analyses. In this study, a comparison of operational available spatial soil moisture dataset from active microwave sensor with 50 km spatial resolution - ASCAT scatterometer - with existing in-situ rainfall data is performed. The ASCAT data are processed at the Vienna University of Technology (TU WIEN), and recently became operationally available via EUMETCAST. Together with its predecessor - ERS 1/2 - the ASCAT/ERS scatterometers embrace period of 1992 until recent with existing gap over Somalia (2001-2007). The rainfall data were provided by the SWALIM organization. The focus is brought on the ability of the ASCAT scatterometer to detect first rains in the season that dictate the schedule of agricultural activities from land preparation, crop variety to selection to planting. Further, the ability to detect moisture deviations with coarse resolution soil moisture data is studied. The remote sensing data are especially important for countries like Somalia with the poor field accessibility. The improved understanding of the soil moisture data from active microwave sensor may help in interpolating data from existing in-situ networks both

  5. Conducting and Reporting Case Studies.

    ERIC Educational Resources Information Center

    Lichtman, Merilyn; Taylor, Satomi Izumi

    Issues and elements of case study research are explored and illustrated with the example of a case study of a kindergarten in a suburb of Tokyo (Japan). Case study research is a type of qualitative research that concentrates on a single unit or entity, with boundaries established by the researcher. The case is an example drawn from a larger class,…

  6. Sensitivity of chemistry-transport model simulations to the duration of chemical and transport operators: a case study with GEOS-Chem v10-01

    NASA Astrophysics Data System (ADS)

    Philip, Sajeev; Martin, Randall V.; Keller, Christoph A.

    2016-05-01

    Chemistry-transport models involve considerable computational expense. Fine temporal resolution offers accuracy at the expense of computation time. Assessment is needed of the sensitivity of simulation accuracy to the duration of chemical and transport operators. We conduct a series of simulations with the GEOS-Chem chemistry-transport model at different temporal and spatial resolutions to examine the sensitivity of simulated atmospheric composition to operator duration. Subsequently, we compare the species simulated with operator durations from 10 to 60 min as typically used by global chemistry-transport models, and identify the operator durations that optimize both computational expense and simulation accuracy. We find that longer continuous transport operator duration increases concentrations of emitted species such as nitrogen oxides and carbon monoxide since a more homogeneous distribution reduces loss through chemical reactions and dry deposition. The increased concentrations of ozone precursors increase ozone production with longer transport operator duration. Longer chemical operator duration decreases sulfate and ammonium but increases nitrate due to feedbacks with in-cloud sulfur dioxide oxidation and aerosol thermodynamics. The simulation duration decreases by up to a factor of 5 from fine (5 min) to coarse (60 min) operator duration. We assess the change in simulation accuracy with resolution by comparing the root mean square difference in ground-level concentrations of nitrogen oxides, secondary inorganic aerosols, ozone and carbon monoxide with a finer temporal or spatial resolution taken as "truth". Relative simulation error for these species increases by more than a factor of 5 from the shortest (5 min) to longest (60 min) operator duration. Chemical operator duration twice that of the transport operator duration offers more simulation accuracy per unit computation. However, the relative simulation error from coarser spatial resolution generally

  7. Five case studies of multifamily weatherization programs

    SciTech Connect

    Kinney, L; Wilson, T.; Lewis, G.; MacDonald, M.

    1997-12-31

    The multifamily case studies that are the subject of this report were conducted to provide a better understanding of the approach taken by program operators in weatherizing large buildings. Because of significant variations in building construction and energy systems across the country, five states were selected based on their high level of multifamily weatherization. This report summarizes findings from case studies conducted by multifamily weatherization operations in five cities. The case studies were conducted between January and November 1994. Each of the case studies involved extensive interviews with the staff of weatherization subgrantees conducting multifamily weatherization, the inspection of 4 to 12 buildings weatherized between 1991 and 1993, and the analysis of savings and costs. The case studies focused on innovative techniques which appear to work well.

  8. Vertebral Angiosarcoma. Case Study.

    PubMed

    Guzik, Grzegorz

    2015-01-01

    Bone angiosarcomas, especially vertebral angiosarcomas, are very rare. There are no studies based on large clinical samples in the literature, and only a few single case reports can be found. The symptoms of the disease are not specific. It is usually detected incidentally or at a late stage when pathological vertebral fractures or neurological complications occur. Diagnostic imaging and history help to recognize the tumour behind the symptoms, but do not allow accurate clinical diagnosis. The basis for a diagnosis is the histopathological examination supported by immunohistochemistry (IHC) assays. The case of a 26-year-old woman with an angiosarcoma involving the eighth thoracic vertebra we report reflects diagnostic problems adversely affecting the efficacy and accuracy of treatment offered to patients. The patient underwent three surgeries of the spine, including two biopsies. A needle biopsy did not provide sufficient information for the diagnosis. An open excisional biopsy, which at the same time temporarily reduced neurological deficits in the patient, was the only chance to obtain an accurate diagnosis. The third surgery was posterior decompression of the spinal cord due to the rapidly escalating paraparesis. It was not until 8 weeks later that the final diagnosis was established. At that time, the patient could not be qualified for any supplementary treatment. The patient died in hospital 6 months after the onset of disease. PMID:26468177

  9. PREDICT : A CASE STUDY.

    SciTech Connect

    Kerscher, W. J. III; Booker, J. M.; Meyer, Mary A.

    2001-01-01

    Delphi Automotive Systems and the Los Alamos National Laboratory worked together to develop PREDICT, a new methodology to characterize the reliability of a new product during its development program. Rather than conducting testing after hardware has been built, and developing statistical confidence bands around the results, this updating approach starts with an early reliability estimate characterized by large uncertainty, and then proceeds to reduce the uncertainty by folding in fresh information in a Bayesian framework. A considerable amount of knowledge is available at the beginning of a program in the form of expert judgment which helps to provide the initial estimate. This estimate is then continually updated as substantial and varied information becomes available during the course of the development program. This paper presents a case study of the application of PREDICT, with the objective of further describing the methodology. PREDICT has been honored with an R&D 100 Award presented by R&D Magazine.

  10. A cask fleet operations study

    SciTech Connect

    Not Available

    1988-03-01

    This document describes the cask fleet currently available to transport spent nuclear fuels. The report describes the proposed operational procedures for these casks and the vehicles intended to transport them. Included are techniques for loading the cask, lifting it onto the transport vehicle, preparing the invoices, and unloading the cask at the destination. The document concludes with a discussion on the maintenance and repair of the casks. (tem) 29 figs.

  11. Effects of Intra-Operative Total Intravenous Anaesthesia with Propofol versus Inhalational Anaesthesia with Sevoflurane on Post-Operative Pain in Liver Surgery: A Retrospective Case-Control Study

    PubMed Central

    Choi, Siu Wai; Wong, Stanley Sau Ching; Chan, Albert Chi Yan; Irwin, Michael G; Cheung, Chi Wai

    2016-01-01

    Background Patients receiving total intravenous anesthesia (TIVA) with propofol have been shown to experience less postoperative pain. We evaluated the post-operative analgesic effects of propofol compared with sevoflurane maintenance of anesthesia in liver surgery. This study was registered at ClinicalTrials.gov (NCT02179437). Methods In this retrospective study, records of patients who underwent liver surgery between 2010 and 2013 were reviewed. Ninety-five patients anesthetized with propofol TIVA were matched with 95 patients anesthetized with sevoflurane. Numeric pain rating scale (NRS) pain scores, postoperative morphine consumption, side effects and patients’ satisfaction with pain relief were evaluated. Results The TIVA group reported lower NRS pain scores during coughing on postoperative days 1 and 2 but not 3 (p = 0.0127, p = 0.0472, p = 0.4556 respectively). They also consumed significantly less daily (p = 0.001 on day 1, p = 0.0231 on day 2, p = 0.0004 on day 3), accumulative (p = 0.001 on day 1, p<0.0001 on day 2 and p = 0.0064 on day 3) and total morphine (p = 0.03) when compared with the sevoflurane group. There were no differences in total duration of intravenous patient controlled analgesia (PCA) morphine use and patient satisfaction. No difference was found in reported side effects. Conclusion Patients anesthetized with propofol TIVA reported less pain during coughing and consumed less daily, accumulative and total morphine after liver surgery. PMID:26901037

  12. The deployment of a tissue request tracking system for the CHTN: a case study in managing change in informatics for biobanking operations

    PubMed Central

    2010-01-01

    Background Managing change has not only been recognized as an important topic in medical informatics, but it has become increasingly important in translational informatics. The move to share data, together with the increasing complexity and volume of the data, has precipitated a transition from locally stored worksheet and flat files to relational data bases with object oriented interfaces for data storage and retrieval. While the transition from simple to complex data structures, mirroring the transition from simple to complex experimental technologies, seems natural, the human factor often fails to be adequately addressed leading to failures in managing change. Methods We describe here a case study in change management applied to an application in translational informatics that touches upon changes in hardware, software, data models, procedures, and terminology standards. We use the classic paper by Riley and Lorenzi to dissect the problems that arose, the solutions that were implemented, and the lessons learned. Results The entire project from requirements gathering through completion of migration of the system took three years. Double data entry into the old and new systems persisted for six months. Contributing factors hindering progress and solutions to facilitate managing the change were identified in seven of the areas identified by Riley and Lorenzi: communications, cultural changes in work practice, scope creep, leadership and organizational issues, and training. Conclusions Detailed documentation of the agreed upon requirements for the new system along with ongoing review of the sources of resistance to change as defined by Riley and Lorenzi were the most important steps taken that contributed to the success of the project. Cultural changes in tissue collection mandated by standards requirements introduced by the Cancer Bioinformatics Grid (CaBIG®) and excessive reliance on the outgoing system during a lengthy period of dual data entry were the primary

  13. Per operative discovery of Placenta Praevia Percreta: a case report

    PubMed Central

    Mbuagbaw, Lawrence; Morfaw, Frederick Lifangi-Ikomi

    2013-01-01

    Placenta percreta is a rare pathological entity with challenging diagnostic and therapeutic requirements especially for resource limited settings. We present here the case of a 40 year old woman with a per operative diagnosis of placenta accreta during a caesarian section indicated for placenta praevia. We highlight the diagnostic and therapeutic difficulties associated with this condition especially in low resource settings. Physicians performing caesarian sections should be prepared for complex intra-operative findings in high risk patients. PMID:24672624

  14. SEASAT economic assessment. Volume 6: Arctic operations case study and generalization. [economic benefits of SEASAT satellites to oil exploration in the Arctic

    NASA Technical Reports Server (NTRS)

    1975-01-01

    The hypothetical development and transportation of Arctic oil and other resources by ice breaking super tanker fleets to the continental East Coast are discussed. The utilization of SEASAT ice mapping data is shown to contribute to a more effective transportation operation through the Arctic ice by reducing transportation costs as a consequence of reduced transit time per voyage.

  15. Developing Job Literacy Training Programs for Business and Industry: A Case Study of Literacy Training to Prepare CETA Eligible Workers as Competitive Word-Processor Operators.

    ERIC Educational Resources Information Center

    Mikulecky, Larry

    A Chicago area private consulting firm worked in cooperation with the Comprehensive Employment and Training Act (CETA) program to train applicants in word processing operations. Careful task analyses of on-the-job word processing were used to develop a curriculum based on realistic goals and expectations. Small groups of CETA eligible applicants…

  16. Planning a Year-Round School Operation (A Case-Study of the Valley View School District 45-15 Plan). Final Report.

    ERIC Educational Resources Information Center

    Rogge, William M.

    The year-round school operation of the Valley View School District is described from its planning stages through the implementation of the plans. A "45-15 Plan" provides for each pupil forty-five days of instruction and fifteen equivalent days of vacation. With the cycle repeated four times each year, one-fourth of the pupils are on vacation at…

  17. Natural Learning Case Study Archives

    ERIC Educational Resources Information Center

    Lawler, Robert W.

    2015-01-01

    Natural Learning Case Study Archives (NLCSA) is a research facility for those interested in using case study analysis to deepen their understanding of common sense knowledge and natural learning (how the mind interacts with everyday experiences to develop common sense knowledge). The database comprises three case study corpora based on experiences…

  18. Case Studies in Wilderness Medicine.

    ERIC Educational Resources Information Center

    Gray, Melissa; Tarter, Shana Lee

    Five case studies explore issues in wilderness medicine, with emphasis on evacuation decision making. The cases describe medical problems encountered during wilderness trips involving college or high school students. In each case, the situation and facts of the case are outlined, including the patient's medical history and vital signs, and at…

  19. Termination: A Case Study.

    PubMed

    Friedberg, Ahron L

    2015-12-01

    In this article I posit and examine certain criteria and qualities for ending an analysis. The case study describes the end phase of a four-year psychoanalysis in which the patient's decision to move to another area forced the end of his analysis. We continued to explore and work through his core neurotic conflicts that included issues of competitive rivalry, dominance and submission, control, and anxiety about birth and death. A shift in the transference from me as a negative father to me as a supportive but competitive older brother was also examined in the context of ending treatment as well as other aspects of the transference. In addition, we analyzed the meaning of his ending treatment based on an extra-analytic circumstance. In discussing this phase of treatment, the definition and history of the term "termination" and its connotations are reviewed. Various criteria for completing an analysis are examined, and technical observations about this phase of treatment are investigated. It was found that while a significant shift in the transference occurred in this phase of the patient's analysis, conflicts related to the transference were not "resolved" in the classical sense. Terminating treatment was considered as a practical matter in which the patient's autonomy and sense of choice were respected and analyzed. PMID:26583444

  20. [Endothoracic goiter operated on by cervicosternotomy. Apropos of 18 cases].

    PubMed

    Cougard, P; Vanet, S; Matet, P; Goudet, P; Viard, H

    From 1968 to 1992, 18 sternotomies were performed on a total amount of 225 operated substernal goiters (8% of cases). These operations concerned 14 females and 4 males aged of about 67.8 years. 7 patients had already been operated of a goiter within 1 to 50 years. The substernal goiter was discovered on a systematic x ray chest 5 times, and a x-ray scanner once, also clinical symptoms were still present with compressive troubles in 16 times (particularly acute dyspnea 3 times). The sternotomy was always total. It was only required if the operative problems were important at the time of the cervicotomy. Indications for sternotomy were:--impossibility to extraction due to the volume of the goiter 10 times, (including 5 recurrent goiters), independent retrosternal goiter without cervical connexion, 2 times (including 2 recurrent goiters), hemorrhagic linkage, 3 times, invasive cancer, 3 times. Excluding the 3 invasive cancers, the mortality was inexistant and the morbidity very low, especially without respiratory problems. Post operative complications were 2 definitive hypoparathyroidism and 1 regressive recurrential palsy (plus 2 recurrential palsy still present before the operation). The authors pointed out the good tolerance of the sternotomy which, in special case, should be absolutely preferable the cervicotomy alone, in order to reduce the operative risks, especially hemorrhagic and nervous. PMID:7768116

  1. Enhancing orbital servicing operations: Providing positive and effective management of spare and installed hardware - A case study of the Hubble Space Telescope

    NASA Technical Reports Server (NTRS)

    Randolph, Joseph L.; Shepard, Kenneth E.

    1990-01-01

    The Satellite Resources Management and Tracking System was developed specifically for the Hubble Space Telescope (HST) program, and now, NASA has the ability to immediately access the necessary data for planning successful orbital satellite servicing operations. This system is an online, real-time data base system that contains a plethora of data on each item identified to support the HST throughout its planned 15 year life. Some of the information provided includes the current status, location, quantity, and history of each asset, a separate record for each discrete serial numbered item, procurement lead times on items sensitive to technology obsolescence, and the maintenance and repair history of each asset. Finally, details are provided on organizational, operational and logistics requirements.

  2. Bridging the accountability divide: male circumcision planning in Rwanda as a case study in how to merge divergent operational planning approaches.

    PubMed

    McPherson, Dacia B; Balisanga, Helene N; Mbabazi, Jennifer K

    2014-10-01

    When voluntary medical male circumcision (MC) was confirmed as an effective tool for HIV prevention in sub-Saharan Africa in 2007, many public health policy makers and practitioners were eager to implement the intervention. How to roll out the tool as part of comprehensive strategy however was less clear. At the time, very little was known about the capacity of health systems to scale delivery of the new intervention. Today, nearly all countries prioritized for the intervention are far behind their targets. To contribute to the discourse on why this is, we develop a historical analysis of medical MC planning in sub-Saharan Africa using our own experience of this process in Rwanda. We compare our previously unpublished feasibility analysis from 2008 with international research published in 2009, which suggested how Rwanda could reduce HIV incidence through a rapid MC intervention, and Rwanda's eventual 2010 official operational plan. We trace how, in the face of uncertainty, operational plans avoided discussing the details of feasibility and focused instead on defining optimal circumcision capacity needed to achieve country level target reductions in HIV incidence. We show a distinct gap between the targets set in the official operational plan and what we determined was feasible in 2008. With actual data from the ground now available, we show our old feasibility models more closely approximate circumcision delivery rates to date. With an eye toward the future of long-term policy planning, we discuss the mechanics of how accountability gaps like this occur in global health policy making and how practitioners can better create achievable operational targets. PMID:24056898

  3. Three-Dimensional Assessment of Automated Breast Volume Scanner Compared with Handheld Ultrasound in Pre-Operative Breast Invasive Ductal Carcinomas: A Pilot Study of 51 Cases.

    PubMed

    Xu, Chaoli; Wei, Shuping; Xie, Yingdong; Guan, Xiaoxiang; Yang, Bin

    2016-09-01

    The aim of the work described here was to compare the accuracy of conventional handheld ultrasound (HHUS) with that of an automated breast volume scanner (ABVS) in 3-D assessment of pre-operative invasive ductal carcinomas. HHUS and ABVS were used in 51 patients to obtain the largest tumor diameter, tumor volume and tumor surface area. The volumetric measurement was also obtained from ABVS data with medical software. With tumor size and volume on pathology as the gold standard, Bland-Altman analysis was used to compare variability. Correlation coefficients and receiver operating characteristic curves were established for all measurements for T2 classification. The correlation coefficients of all ABVS measurements were stronger than those of HHUS measurements, with the ABVS volumetric measurement significantly different with a higher accuracy of 88.24% (45/51) and predicting T-classification with higher area under the receiver operating characteristic curves (0.936). Therefore, 3-D measurements provide stronger correlations with pathology in tumor size measurement. However, more clinical trials are needed to confirm our findings. PMID:27339762

  4. OEPSS operationally efficient propulsion system study

    NASA Technical Reports Server (NTRS)

    1993-01-01

    A final report on the Operationally Efficient Propulsion System Study (OEPSS) is presented. A review of Launch Site Operations, OEPSS objectives, operations support structure, OEPSS Concerns List, and scope of OEPSS are summarized, along with goals of OEPSS technologies, and operations technology levels. Air-augmented ejector/rocket, flash boiling tank pressurization technology, and advanced LH2 turbopump are described. Launch facilities, operations-driven propulsion system architecture, integrated booster propulsion module, turbopump operating conditions, and payload capability using integrated engine elements are addressed among other topics.

  5. Calciphylaxis: a case study.

    PubMed

    Kauric-Klein, Zorica

    2012-01-01

    Caring for J.D. was a stressful experience. The extent of her wounds, pain, and limited options for treatment was very frustrating for the nursing staff. Although she did not survive, patient outcomes were met to some degree. Her pain was controlled to a greater extent, and there was less infection present in her wounds. The nurses worked with J.D. closely to improve her pain control and facilitate less painful dressing changes. They were vigilant in assessing the progress of her wound healing and communicating any increased signs of infections from her wounds. They sang with her to help distract her from the pain she was experiencing and to help her cope with her lengthy 8-month hospitalization. Providing care for J.D. was also a very important learning experience for nurses in terms of appropriate pain management for patients with CUA, wound care, and the need to sustain adequate nutrition to promote wound healing. CUA is a rare but potentially fatal disease that occurs in patients with end stage renal disease (ESRD). Early diagnosis and treatment are essential to prevent the devastating effects of this disease. Nephrology nurses need to reinforce the importance of keeping calcium, phosphorous, and parathyroid levels within normal ranges for their patients on dialysis. They also need to be vigilant in monitoring for potential CUA skin lesions to prevent and treat it early. To date, treatment options are mostly based on findings from case reports. Treatment requires a multidisciplinary approach with input from nephrologists, nurses, pain specialists, infectious disease specialists, and surgeons. The major goals of treatment are controlling risk factors, controlling pain, and preventing wound infection and possible sepsis. More studies need to be conducted to test interventions that may help treat CUA. PMID:23094342

  6. [Deep brain stimulation in a patient with ocd and the intensive pre- and post-operative psychiatric/psychotherapeutic follow-up. A case study].

    PubMed

    Corveleyn, P; Nuttin, B; Gabriëls, L

    2013-01-01

    Deep brain stimulation (DBS) is a neurosurgical intervention carried out in meticulously selected patients with a therapy-resistant obsessive-compulsive disorder (OCD). We describe the pre- and post-operative psychiatric care given to a 51-year-old woman before, during and after treatment with deep brain stimulation. The psychiatric follow-up included an intensive search for the optimal stimulation parameters, and considerable attention was given to psycho-education, psychotherapy and counselling. The procedure resulted in a marked improvement in the patient's OCD and made it easier for the patient to re-construct a meaningful life. PMID:23512633

  7. Teaching Pharmacology by Case Study.

    ERIC Educational Resources Information Center

    Jordan, Sue

    1997-01-01

    Using pharmacology case studies with nursing students encourages theory-practice links and infuses real-life content. Cases provide rich qualitative data for evaluating curriculum. However, they are not a substitute for evidence-based practice. (SK)

  8. Sensitivity of chemical transport model simulations to the duration of chemical and transport operators: a case study with GEOS-Chem v10-01

    NASA Astrophysics Data System (ADS)

    Philip, S.; Martin, R. V.; Keller, C. A.

    2015-11-01

    Chemical transport models involve considerable computational expense. Fine temporal resolution offers accuracy at the expense of computation time. Assessment is needed of the sensitivity of simulation accuracy to the duration of chemical and transport operators. We conduct a series of simulations with the GEOS-Chem chemical transport model at different temporal and spatial resolutions to examine the sensitivity of simulated atmospheric composition to temporal resolution. Subsequently, we compare the tracers simulated with operator durations from 10 to 60 min as typically used by global chemical transport models, and identify the timesteps that optimize both computational expense and simulation accuracy. We found that longer transport timesteps increase concentrations of emitted species such as nitrogen oxides and carbon monoxide since a more homogeneous distribution reduces loss through chemical reactions and dry deposition. The increased concentrations of ozone precursors increase ozone production at longer transport timesteps. Longer chemical timesteps decrease sulfate and ammonium but increase nitrate due to feedbacks with in-cloud sulfur dioxide oxidation and aerosol thermodynamics. The simulation duration decreases by an order of magnitude from fine (5 min) to coarse (60 min) temporal resolution. We assess the change in simulation accuracy with resolution by comparing the root mean square difference in ground-level concentrations of nitrogen oxides, ozone, carbon monoxide and secondary inorganic aerosols with a finer temporal or spatial resolution taken as truth. Simulation error for these species increases by more than a factor of 5 from the shortest (5 min) to longest (60 min) temporal resolution. Chemical timesteps twice that of the transport timestep offer more simulation accuracy per unit computation. However, simulation error from coarser spatial resolution generally exceeds that from longer timesteps; e.g. degrading from 2° × 2.5° to 4° × 5

  9. Case study of the operational usefulness of the Sharp Workstation in forecasting a mesocyclone-induced cold sector Tornado event in California. Technical memo

    SciTech Connect

    Monteverdi, J.P.

    1993-03-01

    An illustration of the operational usefulness of the SHARP Workstation in providing supplementary guidance to forecasters in a situation in which two tornadoes occurred in California's Sacramento Valley is presented. Use of the SHARP Workstation in analyzing the initial hodograph and in producing a bogus afternoon sounding and hodograph for the Sacramento Valley indicated that buoyancy and shear were in the correct range for moderate to strong mesocyclone-induced tornadoes. Conventional wisdom would have suggested that weak funnel clouds and small hail were the chief threats in the weather pattern. However, forecasters, aware of the role of shear in inducing storm rotation and of the potential for the weather pattern to be associated with favorable buoyancy and shear parameters in certain regions of California, would have been alert to the possibility of damaging and potentially life-threatening tornadoes.

  10. Annular pancreas intra operatively discovered: a case report

    PubMed Central

    Zeineb, Mzoughi; Sadri, Ben Abid; Nizar, Miloudi; Hassen, Hentati; Nafaa, Arfa; Taher, Khalfallah

    2011-01-01

    Annular pancreas is a rare congenital abnormality. This entity can rarely be symptomatic. Patients can present with gastrointestinal obstruction or acute pancreatitis. We report a case with a rich iconography, of an annular pancreas discovered intraoperatively. A 46-year-old woman was operated with the diagnosis of acute cholecystitis with common bile duct stones. At operation, a strip of pancreatic tissue (2 cm) completely encircled the second duodenum. Open cholecytectomy with choledocotomy and stones extractionwas done. Postoperatively, she developed an acute pancreatitis. The post-operative cholangiography showed the annular duct surrounding the second duodenum. Annular pancreas is rare. Symptoms may occur in newborn children. In adults, annular pancreas discovering is radiological or intra operatively. PMID:24765382

  11. Operation costs and pollutant emissions reduction by definition of new collection scheduling and optimization of MSW collection routes using GIS. The case study of Barreiro, Portugal.

    PubMed

    Zsigraiova, Zdena; Semiao, Viriato; Beijoco, Filipa

    2013-04-01

    This work proposes an innovative methodology for the reduction of the operation costs and pollutant emissions involved in the waste collection and transportation. Its innovative feature lies in combining vehicle route optimization with that of waste collection scheduling. The latter uses historical data of the filling rate of each container individually to establish the daily circuits of collection points to be visited, which is more realistic than the usual assumption of a single average fill-up rate common to all the system containers. Moreover, this allows for the ahead planning of the collection scheduling, which permits a better system management. The optimization process of the routes to be travelled makes recourse to Geographical Information Systems (GISs) and uses interchangeably two optimization criteria: total spent time and travelled distance. Furthermore, rather than using average values, the relevant parameters influencing fuel consumption and pollutant emissions, such as vehicle speed in different roads and loading weight, are taken into consideration. The established methodology is applied to the glass-waste collection and transportation system of Amarsul S.A., in Barreiro. Moreover, to isolate the influence of the dynamic load on fuel consumption and pollutant emissions a sensitivity analysis of the vehicle loading process is performed. For that, two hypothetical scenarios are tested: one with the collected volume increasing exponentially along the collection path; the other assuming that the collected volume decreases exponentially along the same path. The results evidence unquestionable beneficial impacts of the optimization on both the operation costs (labor and vehicles maintenance and fuel consumption) and pollutant emissions, regardless the optimization criterion used. Nonetheless, such impact is particularly relevant when optimizing for time yielding substantial improvements to the existing system: potential reductions of 62% for the total

  12. Emotion, Engagement, and Case Studies

    ERIC Educational Resources Information Center

    Herreid, Clyde Freeman; Terry, David R.; Lemons, Paula; Armstrong, Norris; Brickman, Peggy; Ribbens, Eric

    2014-01-01

    Three college faculty taught large general biology classes using case studies and personal response systems (clickers). Each instructor taught the same eight cases in two different sections, except the questions within the cases differed. In one section the questions were lower order (LO) factual inquiries, and in the other they were largely…

  13. Design aspects of zeppelin operations from case histories

    NASA Technical Reports Server (NTRS)

    Maiersperger, W. P.

    1975-01-01

    Some widely held beliefs concerning the practicability of rigid airships in air carrier operations are discussed. It is shown by a review of past operational experience, and some basic aerostatic theory, their actual record and the reasons for their demise. Problems of atmospheric density and temperature variations, meteorological factors, aerodynamic stability and control, and mooring difficulties are discussed and related to actual case histories. Structural and flight efficiencies are compared to airplane efficiencies for airplanes contemporary with the zeppelin as well as modern designs. The difficulty of supporting new, commercial airship developments on an economic basis is made clear.

  14. Case Study: Case Studies and the Flipped Classroom

    ERIC Educational Resources Information Center

    Herreid, Clyde Freeman; Schiller, Nancy A.

    2013-01-01

    This column provides original articles on innovations in case study teaching, assessment of the method, as well as case studies with teaching notes. This month's issue discusses the positive and negative aspects of the "flipped classroom." In the flipped classroom model, what is normally done in class and what is normally done as…

  15. Numerical Modeling to Assess DNAPL Movement and Removal at the Scenic Site Operable Unit Near Baton Rouge, Louisiana: A Case Study.

    SciTech Connect

    Oostrom, Mart; Thorne, Paul D.; White, Mark D.; Truex, Michael J.; Wietsma, Thomas W.

    2003-12-01

    Detailed three-dimensional multifluid flow modeling was conducted to assess movement and removal of dense nonaqueous phase liquid (DNAPL) movement at a waste site in Louisiana. The site’s subsurface consists of several permeable zones separated by (semi) confining clays. In the upper subsurface, the two major permeable zones are, starting with the uppermost zone, the +40- and +20-MSL (mean sea level) zones. At the site, a total of 23,000 m3 of DNAPL was emplaced in an open waste pit between 1962 and 1974. In this period, considerable amounts of DNAPL moved into the subsurface. By 1974 a portion of the DNAPL was removed and the waste site was filled with low-permeability materials and closed. During this process, some of the DNAPL was mixed with the fill material and remained at the site. Between 1974 and 2000, no additional DNAPL recovery activities were implemented. In an effort to reduce the DNAPL source, organic liquid has been pumped through a timed-pumping scheme from a total of 7 wells starting in calendar year 2000. The recovery wells are screened in the lower part of the waste fill material. In site investigations, DNAPL has been encountered in the +40-MSL but not in the +20-MSL zone. The following questions are addressed: (1) Where has the DNAPL migrated vertically and laterally? (2) How much further is DNAPL expected to move in the next century? (3) How effective is the current DNAPL pumping in reducing the DNAPL source? The computational domains for the simulations were derived from 3-D interpolations of borehole logs using a geologic interpretation software (EarthvisionTM ) . The simulation results show that DNAPL primarily entered the subsurface in the period 1962 – 1974, when the waste site was operational. After 1974, the infiltration rates dropped dramatically as a result of the infilling of the waste pit. The simulation results indicate that DNAPL moved from the pit into the underlying +40-MSL zone through two contact zones at the

  16. An Investigation of Run-Time Operations in a Heterogeneous Desktop Grid Environment: The Texas Tech University Desktop Grid Case Study

    ERIC Educational Resources Information Center

    Perez, Jerry F.

    2013-01-01

    The goal of the dissertation study was to evaluate the existing DG scheduling algorithm. The evaluation was developed through previously explored simulated analyses of DGs performed by researchers in the field of DG scheduling optimization and to improve the current RT framework of the DG at TTU. The author analyzed the RT of an actual DG, thereby…

  17. Syncope: Case Studies.

    PubMed

    Kleyman, Inna; Weimer, Louis H

    2016-08-01

    Syncope, or the sudden loss of consciousness, is a common presenting symptom for evaluation by neurologists. It is not a unique diagnosis but rather a common manifestation of disorders with diverse mechanisms. Loss of consciousness is typically preceded by a prodrome of symptoms and sometimes there is a clear trigger. This article discusses several cases that illustrate the various causes of syncope. Reflex syncope is the most common type and includes neurally mediated, vasovagal, situational, carotid sinus hypersensitivity, and atypical forms. Acute and chronic autonomic neuropathies and neurodegenerative disorders can also present with syncope. PMID:27445240

  18. [Cystohepatic ducts. Surgical problems and review of the literature. About 10 operated cases (author's transl)].

    PubMed

    Boutboul, R; Le Treut, Y P; Pau, C; Rodde, J M; Bricot, R

    1982-05-01

    The authors are reporting 10 cases of operated cystohepatic ducts. In each case there is a unic duct, leading five times in the gallbladder, and once in the cystic duct. In 8 cases this abnormality was shown intraoperatively. In 2 cases the diagnosis was only given during the surgical procedure, when a fistulography was performed. In one case it was necessary to reoperate. In four cases during the cholecystectomy we had to ligate the cystohepatic duct. In order to argue these cases, a literature review was done: 42 cases were found. The ligation of a cystohepatic duct is in most cases without consequences. the different ways of restoration are studied when large ducts are found. The best treatment of such an abnormality seems to be an anterograde cholecystectomy associated to a systematic drainage of the gallbladder region. PMID:7107732

  19. Which data for quantitative landslide susceptibility mapping at operational scale? Case study of the Pays d'Auge plateau hillslopes (Normandy, France)

    NASA Astrophysics Data System (ADS)

    Fressard, M.; Thiery, Y.; Maquaire, O.

    2014-03-01

    This paper aims at assessing the impact of the data set quality for landslide susceptibility mapping using multivariate statistical modelling methods at detailed scale. This research is conducted on the Pays d'Auge plateau (Normandy, France) with a scale objective of 1 / 10 000, in order to fit the French guidelines on risk assessment. Five sets of data of increasing quality (considering accuracy, scale fitting, and geomorphological significance) and cost of acquisition are used to map the landslide susceptibility using logistic regression. The best maps obtained with each set of data are compared on the basis of different statistical accuracy indicators (ROC curves and relative error calculation), linear cross correlation and expert opinion. The results highlight that only high-quality sets of data supplied with detailed geomorphological variables (i.e. field inventory and surficial formation maps) can predict a satisfying proportion of landslides in the study area.

  20. Which data for quantitative landslide susceptibility mapping at operational scale? Case study of the Pays d'Auge plateau hillslopes (Normandy, France)

    NASA Astrophysics Data System (ADS)

    Fressard, M.; Thiery, Y.; Maquaire, O.

    2013-04-01

    The objective of this paper is to assess the impact of the datasets quality for the landslide susceptibility mapping using multivariate statistical modelling methods at detailed scale. This research is conducted in the Pays d'Auge plateau (Normandy, France) with a scale objective of 1/10000, in order to fit the French guidelines on risk assessment. Five sets of data of increasing quality (considering accuracy, scale fitting, geomophological significance) and cost of acquisition are used to map the landslide susceptibility using logistic regression. The best maps obtained with each set of data are compared on the basis of different statistical accuracy indicators (ROC curves and relative error calculation), linear cross correlation and expert opinion. The results highlights that only high quality sets of data supplied with detailed geomorphological variables (i.e. field inventory and surficial formations maps) can predict a satisfying proportion of landslides on the study area.

  1. Design and Economic Analysis of a Heating/Absorption Cooling System Operating with Municipal Solid Waste Digester: A Case Study of Gazi University

    NASA Astrophysics Data System (ADS)

    Coşar, Gökhan; Pooyanfar, Mirparham; Amirabedin, Ehsan; Topal, Hüseyin

    2013-12-01

    Recovering energy from municipal solid waste (MSW) is one of the most important issues of energy management in developed countries. This raises even more interest as world fossil fuel reserves diminish and fuel prices rise. Being one of main processes of waste disposal, anaerobic digestion can be used as a means to reduce fossil fuel and electricity consumption as well as reducing emissions. With growing demand for cooling in Turkey, especially during warm seasons and considering the energy costs, utilizing heat-driven absorption cooling systems coupled with an anaerobic digester for local cooling purposes is a potentially interesting alternative for electricity driven compression cooling. The aim of this article is to study the viability of utilizing biogas obtained from MSW anaerobic digestion as the main fuel for heating facilities of Gazi University, Turkey and also the energy source for an absorption cooling system designed for the central library of the aforementioned campus. The results prove that the suggested system is sustainably and financially appealing and has the potential to replace the conventional electricity driven cooling systems with a reasonable net present worth; moreover, it can notably reduce carbon dioxide emissions.

  2. Three Community College Case Studies

    ERIC Educational Resources Information Center

    Wojtysiak, Joseph; Sutton, William J., II; Wright, Tommy; Brantley, Linda

    2011-01-01

    This article presents three case studies that focus on specific projects that are underway or have been completed. In the first case study, Joseph Wojtysiak and William J. Sutton, II discuss the Green Center of Central Pennsylvania, which is designed to serve as the state's preeminent source for education, training and public information about…

  3. The Big Read: Case Studies

    ERIC Educational Resources Information Center

    National Endowment for the Arts, 2009

    2009-01-01

    The Big Read evaluation included a series of 35 case studies designed to gather more in-depth information on the program's implementation and impact. The case studies gave readers a valuable first-hand look at The Big Read in context. Both formal and informal interviews, focus groups, attendance at a wide range of events--all showed how…

  4. Instructional Computing: Ten Case Studies.

    ERIC Educational Resources Information Center

    Hargan, Carol; Hunter, Beverly

    These case studies are written for educational institutions that wish to plan, extend, or improve their use of computers for learning and teaching. Each case study includes a brief description of each of the following: profile of the institution, history of the development of instructional computing, organization and management, student access to…

  5. Case Studies in Science Ethics

    NASA Astrophysics Data System (ADS)

    Williams, Karen

    2010-03-01

    Everyone in science should have ethics education training. I have seen graduate students taken advantage of by their mentors. Many of us have seen misconduct...but what should we do about it? Young scientists are often unaware of the rules in science and make mistakes because of their ignorance of the rules in that particular field of study. Then there are an increasing number of cases in the news of overt cases of misrepresentation in science. All are welcome to attend this discussion of case studies. A case study on topics such as: how to treat data properly, how our values in science affect our work, who gets authorship on scientific papers, who is first author on a paper, what you should do if you uncover misconduct or plagiarism in your university, and we will discuss the scientist's role in society. This will be a painless, non-confrontational small group, then large group discussion of each case

  6. ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS: Optical Operator Method in Two-Mode Case and Entangled Fresnel Operator's Decomposition

    NASA Astrophysics Data System (ADS)

    Ma, Shan-Jun; Hu, Li-Yun; Fan, Hong-Yi

    2010-05-01

    Based on the entangled Fresnel operator (EFO) proposed in [Commun. Theor. Phys. 46 (2006) 559], the optical operator method studied by the IWOP technique (Ma et al., Commun. Theor. Phys. 49 (2008) 1295) is extended to the two-mode case, which gives the decomposition of the entangled Fresnel operator, corresponding to the decomposition of ray transfer matrix [A, B, C, D]. The EFO can unify those optical operators in two-mode case. Various decompositions of EFO into the exponential canonical operators are obtained. The entangled state representation is useful in the research.

  7. Assessing the Flipped Classroom in Operations Management: A Pilot Study

    ERIC Educational Resources Information Center

    Prashar, Anupama

    2015-01-01

    The author delved into the results of a flipped classroom pilot conducted for an operations management course module. It assessed students' perception of a flipped learning environment after making them experience it in real time. The classroom environment was construed using a case research approach and students' perceptions were studied using…

  8. Work Teams: A Case Study.

    ERIC Educational Resources Information Center

    Fisher, M. Scott

    1981-01-01

    An important aspect of work environment is job content and structure. As this case study illustrates, increased productivity, enhanced job satisfaction, substantial cost reduction, and a reduction in turnover are some of the benefits of task reorganization. (CT)

  9. Teaching astronomy with case studies

    NASA Astrophysics Data System (ADS)

    Slater, Timothy F.

    2015-11-01

    Breaking the students into small, collaborative learning groups to solve a meaningful task together is one of the most successful and fully evaluated teaching techniques implemented over the last century. Although there are many ways to accomplish small group learning, a long-standing and consistently successful collaborative class activity is to use the case study teaching strategy. The use of case studies is common in medical schools and law schools, but not so common in the teaching of astronomy. Case studies create meaningful conversations among students and with the professor by focusing on life-like dilemmas to be solved. Case study tasks ask audience members to synthesize several ideas or evaluate scenarios that have not been explicitly presented to them in the lecture or in available readings.

  10. Case Study: del Amo Bioventing

    EPA Science Inventory

    The attached presentation discusses the fundamentals of bioventing in the vadose zone. The basics of bioventing are presented. The experience to date with the del Amo Superfund Site is presented as a case study.

  11. Hydrogeologic Case Studies (Seattle, WA)

    EPA Science Inventory

    Hydrogeology is the foundation of subsurface site characterization for evaluations of monitored natural attenuation (MNA). Three case studies are presented. Examples of the potentially detrimental effects of drilling additives on ground-water samples from monitoring wells are d...

  12. HYDROGEOLOGIC CASE STUDIES (CHICAGO, IL)

    EPA Science Inventory

    Hydrogeology is the foundation of subsurface site characterization for evaluations of monitored natural attenuation (MNA). Three case studies are presented. Examples of the potentially detrimental effects of drilling additives on ground-water samples from monitoring wells are d...

  13. HYDROGEOLOGIC CASE STUDIES (DENVER PRESENTATION)

    EPA Science Inventory

    Hydrogeology is the foundation of subsurface site characterization for evaluations of monitored natural attenuation (MNA). Three case studies are presented. Examples of the potentially detrimental effects of drilling additives on ground-water samples from monitoring wells are d...

  14. Nasopharyngeal Case-Control Study

    Cancer.gov

    A case-control study conducted in Taiwan between 1991-1994 among approximately 1,000 individuals to examine the role of viral, environmental, and genetic factors associated with the development of nasopharyngeal carcinoma

  15. Operative Treatment of Bipolar Clavicular Dislocation: A Case Report

    PubMed Central

    Schuh, Alexander; Thonse, Chirag Narayana; Schmickal, Thomas; Kleine, Ludwig

    2012-01-01

    Introduction: Simultaneous bipolar dislocation of the clavicle is uncommon and unusual, although it has been documented as panclavicular dislocation, floating clavicle, and complete dislocation of the clavicle. A review of the recent literature indicated that most bipolar clavicular dislocations have been treated non-operatively. Case Report: We report the case of a 23 year polytrauma patient with bipolar dislocation of the right clavicle. Patient presented to us 2 weeks post injury and had an unstable corao-clavicular joint. On radiographic assessment a simultaneous dislocation of the coraco-clavicular and sterno-clavicular joints of right side was diagnosed. In view of the unstable condition of the right clavicle, young age of the patient, requirement of high physical activity a decision for operative treatment for clavicle dislocation was taken. Patient was treated surgically with open reduction and tension band wiring with good result. Conclusion: Although bipolar dislocation of the clavicle are rare a high index of suspicion will avoid missed diagnosis. Open reduction and internal fixation is a good option in young patients and gives good short term result.

  16. Space Shuttle Proximity Operation Sensor Study

    NASA Technical Reports Server (NTRS)

    Weber, C. L.; Alem, W. K.

    1978-01-01

    The performance of the Kuband radar was analyzed in detail, and the performance was updated and summarized. In so doing, two different radar design philosophies were described, and the corresponding differences in losses were enumerated. The resulting design margins were determined for both design philosophies and for both the designated and nondesignated range modes of operation. In some cases, the design margin was about zero, and in other cases it was significantly less than zero. With the point of view described above, the recommended solution is to allow more scan time but at the present scan rate. With no other changes in the present configuration, the radar met design detection specifications for all design philosophies at a range of 11.3 nautical miles.

  17. [Sciatica in the elderly. Apropos of 27 cases operated after the age of 70].

    PubMed

    Bouchacourt, P; Cayla, J; Moser, G; Rondier, J; Pradat, P

    1982-01-01

    From a study of 27 operations for common vertebral sciatica in the elderly, certain specific features stand out. L5 sciatica is predominant though curiously, the pain relieving posture is less frequent than in the S1 variety. The condition is usually most painful at night. In 50% of cases there is a motor deficit which to a great extend determines the decision to operate. Finally, there is very good correlation between clinical features and the discovery of a prolapsed disc. Osteoarthrotic lesions are much more common than in the general sciatica population but the disc protrusion always keeps its localising value. Surgical intervention reveals that the disc plays an equally important role at this age as a prolapsed disc was found in 26 cases (11 extruded herniated discs and 2 ruptured). These lesions are less common in the general sciatica population. In about two thirds of patients a herniated disc alone is found and in the others, it is associated with osteoarthrotic lesions although these do not appear to compromise the success of the operation. Amongst the 9 post-operative complications, there was one death due to pulmonary emboli and 2 cases of reflex algodystrophy of the foot on the operated side. With a mean delay of more than 1 year, a frank improvement was noted in 85% of cases as against 80% immediately following surgery. Only one case of recurrence was reported. PMID:7187126

  18. Case study: Bioremediation in the Aleutian Islands

    SciTech Connect

    Steward, K.J.; Laford, H.D.

    1995-12-31

    This case study describes the design, construction, and operation of a bioremediation pile on Adak Island, which is located in the Aleutian Island chain. Approximately 1,900 m{sup 3} of petroleum-contaminated soil were placed in the bioremediation pile. The natural bioremediation process was enhanced by an oxygen and nutrient addition system to stimulate microbial activity. Despite the harsh weather on the island, after the first 6 months of operation, laboratory analyses of soil samples indicated a significant (80%) reduction in diesel concentrations.

  19. Case Relationships in the Creative Oral Language of Preoperational and Concrete Operational First Graders.

    ERIC Educational Resources Information Center

    McCabe, Patrick P.

    The creative oral language elicited from 45 preoperational and 40 concrete operational first grade students was analyzed to study the relationship between cognitive development and the types of case relationships produced. Each child's language was analyzed for eight noun/verb relationships, including state, process, action, experience, location,…

  20. Lunar NTR vehicle design and operations study

    NASA Technical Reports Server (NTRS)

    Hodge, John

    1993-01-01

    The results of a lunar nuclear thermal rocket (NTR) vehicle design and operations study are presented in text and graphic form. The objectives of the study were to evaluate the potential applications of a specific NTR design to past and current (First Lunar Outpost) mission profiles for piloted and cargo lunar missions, and to assess the applicability of utilizing lunar vehicle design concepts for Mars missions.

  1. Teaching Case: Enterprise Architecture Specification Case Study

    ERIC Educational Resources Information Center

    Steenkamp, Annette Lerine; Alawdah, Amal; Almasri, Osama; Gai, Keke; Khattab, Nidal; Swaby, Carval; Abaas, Ramy

    2013-01-01

    A graduate course in enterprise architecture had a team project component in which a real-world business case, provided by an industry sponsor, formed the basis of the project charter and the architecture statement of work. The paper aims to share the team project experience on developing the architecture specifications based on the business case…

  2. Sensor study for high speed autonomous operations

    NASA Astrophysics Data System (ADS)

    Schneider, Anne; La Celle, Zachary; Lacaze, Alberto; Murphy, Karl; Del Giorno, Mark; Close, Ryan

    2015-06-01

    As robotic ground systems advance in capabilities and begin to fulfill new roles in both civilian and military life, the limitation of slow operational speed has become a hindrance to the wide-spread adoption of these systems. For example, military convoys are reluctant to employ autonomous vehicles when these systems slow their movement from 60 miles per hour down to 40. However, these autonomous systems must operate at these lower speeds due to the limitations of the sensors they employ. Robotic Research, with its extensive experience in ground autonomy and associated problems therein, in conjunction with CERDEC/Night Vision and Electronic Sensors Directorate (NVESD), has performed a study to specify system and detection requirements; determined how current autonomy sensors perform in various scenarios; and analyzed how sensors should be employed to increase operational speeds of ground vehicles. The sensors evaluated in this study include the state of the art in LADAR/LIDAR, Radar, Electro-Optical, and Infrared sensors, and have been analyzed at high speeds to study their effectiveness in detecting and accounting for obstacles and other perception challenges. By creating a common set of testing benchmarks, and by testing in a wide range of real-world conditions, Robotic Research has evaluated where sensors can be successfully employed today; where sensors fall short; and which technologies should be examined and developed further. This study is the first step to achieve the overarching goal of doubling ground vehicle speeds on any given terrain.

  3. Case Studies in Sports Nutrition.

    ERIC Educational Resources Information Center

    Clark, Nancy

    1988-01-01

    This article presents case studies of two athletes who wanted to affect a change in their body weight in order to enhance athletic performance. Each athlete's problem and the nutrition approach used to solve it are discussed. Caloric values of fast foods are listed. (JL)

  4. Principal Succession: A Case Study.

    ERIC Educational Resources Information Center

    Jones, Jeffery C.; Webber, Charles F.

    Principal succession is misunderstood and underutilized as a means of affecting dynamic renewal in school communities. Previously, the replacement of a principal was examined solely through the experiences of principals and teachers. This paper reports on a case study that added the previously neglected perspectives of students, support staff, and…

  5. The Language Dilemma: Case Study.

    ERIC Educational Resources Information Center

    Teboul, J. C. Bruno

    2002-01-01

    Presents the case study involving a fictitious company's English-only policy and threats of legal action based on that policy. Includes the following responses: "Legal Issues Posed in the Language Dilemma" (Gregory S. Walden); "English Only: A Workplace Dilemma" (Alan Pakiela); "Problems with English-Only Policies" (Barbara Lynn Speicher); and…

  6. INNOVATIVE CLEAN TECHNOLOGIES CASE STUDIES

    EPA Science Inventory

    The Innovative Clean Technologies case studies contained herein are the products of the "Pollution Prevention by and for Small Business" Program (P2SB). he P2SB was an outreach program directed to small businesses that had developed innovative concepts for pollution prevention in...

  7. Due Process Hearing Case Study

    ERIC Educational Resources Information Center

    Bateman, David F.; Jones, Marni Gail

    2010-01-01

    This article presents a due process hearing case study of a mother who contended that his son, D.J., has been denied of a free and appropriate public education (FAPE) of his School District after being suspended from school. D.J., an elementary student, had been described as hyperactive, inattentive, defiant, and often volatile. He was identified…

  8. Case Study: Planning as Learning

    ERIC Educational Resources Information Center

    Smith, Peter A. C.

    2007-01-01

    Proposes that the objectives of strategic planning may be attained more effectively if implemented via a learning paradigm. In support of this claim, describes a case study detailing implementation of such an initiative plus post-implementation interviews. (Contains 5 figures.)

  9. State Planning System. Case Studies.

    ERIC Educational Resources Information Center

    Cherin, Ellen, Ed.

    The State Planning System (SPS) is a policy-oriented management tool intended to help analyze the interrelated effects of alternative policies and their relationships to state goals. Two pilot-test case studies are described--the SPS tuition policy evaluation conducted in Colorado, and New York's SPS evaluation of the applicability of large scale…

  10. Case Studies in Applied Mathematics.

    ERIC Educational Resources Information Center

    Mathematical Association of America, Washington, DC.

    This collection of nine case studies in applied mathematics was written primarily for the use of the instructor by a Conference sponsored by the Committee on the Undergraduate Program in Mathematics (CUPM). Each chapter contains exercises of varying degrees of difficulty and several include student projects. The materials were used on a trial…

  11. The importance of embodied and operational energy and the use of renewable energy systems (RES) in the domestic sector in Greece: Case study, analysis of a design for a private residence in Athens

    NASA Astrophysics Data System (ADS)

    Vogiatzoglou, Nikolaos

    2007-12-01

    The general framework of this thesis is set by addressing the environmental problems that several countries around the world are facing. Greece is undoubtedly one of them, particularly after failing to comply with its Kyoto Protocol commitments and thus meeting the relevant greenhouse gas emission targets. The project focuses on the built environment and more particularly on the domestic sector. The theoretical part contains the presentation of certain sustainable design principles and techniques, the implementation of which may result in a thermally comfortable and healthy interior, minimising the need for the use of non renewable forms of energy (e.g. oil) to heat and/or cool interior space. More specifically, the aim of this dissertation is to evaluate the environmental performance of an un-built residence, assumed to be built in the northern suburbs of Athens. For that reason its fabric is studied in TAS software the size of the openings, the type of glazing, the amount of certain materials (e.g. insulation and wall thicknesses) and so on are tested. The analysis indicates that the house's cooling and heating loads are reasonable and thus it can be described as environmentally friendly to a certain extent. Additionally, the project seeks to highlight the importance of the embodied and operational energy. This is achieved by studying in detail the case study and by calculating its embodied and operational energy, assuming that its lifetime is approximately 40 years. Furthermore, the residence's carbon footprint is calculated as well as the total structural cost, in an attempt to detect the best scenario that combines at the same time the smallest carbon footprint and cost. The analysis provides evidence that that can be achieved by using thicker insulation in the external concrete walls as well as in the roof. Finally, the use of geothermal and solar energy in the domestic sector is explored the former covering the space heating and cooling needs and the latter

  12. Space Operations Center: Shuttle interaction study

    NASA Technical Reports Server (NTRS)

    1981-01-01

    The implication of using the Shuttle with the Space Operation Center (SOC), including constraints that the Shuttle will place upon the SOC design. The study identifies the considerations involved in the use of the Shuttle as a part of the SOC concept, and also identifies the constraints to the SOC imposed by the Shuttle in its interactions with the SOC, and on the design or technical solutions which allow satisfactory accomplishment of the interactions.

  13. Outage management: A case study

    SciTech Connect

    Haber, S.B.; Barriere, M.T. ); Roberts, K.H. . Walter A. Haas School of Business)

    1992-01-01

    Outage management issues identified from a field study conducted at a two-unit commercial pressurized water reactor (PWR), when one unit was in a refueling outage and the other unit was at full power operation, are the focus of this paper. The study was conduced as part of the US Nuclear Regulatory Commission's (NRC) organizational factors research program, and therefore the issues to be addressed are from an organizational perspective. Topics discussed refer to areas identified by the NRC as critical for safety during shutdown operations, including outage planning and control, personnel stress, and improvements in training and procedures. Specifically, issues in communication, management attention, involvement and oversight, administrative processes, organizational culture, and human resources relevant to each of the areas are highlighted by example from field data collection. Insights regarding future guidance in these areas are presented based upon additional data collection subsequent to the original study.

  14. Outage management: A case study

    SciTech Connect

    Haber, S.B.; Barriere, M.T.; Roberts, K.H.

    1992-09-01

    Outage management issues identified from a field study conducted at a two-unit commercial pressurized water reactor (PWR), when one unit was in a refueling outage and the other unit was at full power operation, are the focus of this paper. The study was conduced as part of the US Nuclear Regulatory Commission`s (NRC) organizational factors research program, and therefore the issues to be addressed are from an organizational perspective. Topics discussed refer to areas identified by the NRC as critical for safety during shutdown operations, including outage planning and control, personnel stress, and improvements in training and procedures. Specifically, issues in communication, management attention, involvement and oversight, administrative processes, organizational culture, and human resources relevant to each of the areas are highlighted by example from field data collection. Insights regarding future guidance in these areas are presented based upon additional data collection subsequent to the original study.

  15. Enhancing the quality of case studies in health services research.

    PubMed Central

    Yin, R K

    1999-01-01

    OBJECTIVE: To provide guidance on improving the quality of case studies in health services research. DATA SOURCES: Secondary data, drawing from previous case study research. RESEARCH DESIGN: Guidance is provided to two audiences: potential case study investigators (eight items) and reviewers of case study proposals (four additional items). PRINCIPAL FINDINGS: The guidance demonstrates that many operational steps can be undertaken to improve the quality of case studies. These steps have been a hallmark of high-quality case studies in related fields but have not necessarily been practiced in health services research. CONCLUSIONS: Given higher-quality case studies, the case study method can become a valuable tool for health services research. Images Figure 3 PMID:10591280

  16. End effector monitoring system: An illustrated case of operational prototyping

    NASA Technical Reports Server (NTRS)

    Malin, Jane T.; Land, Sherry A.; Thronesbery, Carroll

    1994-01-01

    Operational prototyping is introduced to help developers apply software innovations to real-world problems, to help users articulate requirements, and to help develop more usable software. Operational prototyping has been applied to an expert system development project. The expert system supports fault detection and management during grappling operations of the Space Shuttle payload bay arm. The dynamic exchanges among operational prototyping team members are illustrated in a specific prototyping session. We discuss the requirements for operational prototyping technology, types of projects for which operational prototyping is best suited and when it should be applied to those projects.

  17. Common Operating Picture: UAV Security Study

    NASA Technical Reports Server (NTRS)

    2004-01-01

    This initial communication security study is a top-level assessment of basic security issues related to the operation of Unmanned Aerial Vehicles (UAVs) in the National Airspace System (NAS). Security considerations will include information relating to the use of International Civil Aviation Organization (ICAO) Aeronautical Telecommunications Network (ATN) protocols and applications identifying their maturity, as well as the use of IPV4 and a version of mobile IPV6. The purpose of this assessment is to provide an initial analysis of the security implications of introducing UAVs into the NAS.

  18. [Research progress on case-control study].

    PubMed

    Zhang, F F; Liu, Z D; Zhang, C X; Jiang, B F

    2016-04-10

    Several new varients related to the case-control designs have been developed in the recent decades, and this article briefly summarized four new designs: two-stage design, case-specular study, exposure-crossover study and case-case-time-control study. This paper involved principles of study design, requisites for application, advantages and disadvantages on all the studies. PMID:27087230

  19. Social license to operate: case from brazilian mining industry

    NASA Astrophysics Data System (ADS)

    Santiago, Ana Lúcia F.; Demajorovic, Jacques; Aledo, Antonio

    2015-04-01

    The approach of the Social License to Operate (SLO) emerges as an important element in academic discussions and business practices related to extractive industries. It appears that in productive activities with great potential to produce economic, social and environmental impacts, conventional approaches based on legal compliance no longer sufficient to legitimize the actions of companies and engagement stakeholders. Studies highlight the need of mining activities receiving a SLO "issued" by companies stakeholders, including society, government, non-governmental organizations, media and communities. However, local communities appears as major stakeholders in governance arrangements, by virtue of its proximity to extractive areas and ability to affect the company's results. Stakeholders with unmet expectations can generate conflicts and risks to the company, the knowledge of these expectations and an awareness of company managers of the importance of Social License to Operate (SLO), can generate strategies and mitigating actions to prevent and or minimize possible conflicts. The concept of SLO arises in engineering extractive industry, when you need to respond to social challenges, beyond the usual environmental challenges, technological and management. According to Franks and Cohen (2012) there is a tendency of engineering sectors, sustainability, environmental, safety and especially in risk mappings, treat the technological issues in a neutral manner, separating the technological research projects of social influences. I want to contribute to the advancement of the debate on stakeholder engagement and adopting as focus on the company's relationship with the community, the aim of this study was to understand how a social project held by one of the largest mining companies in Brazil contributed to the process of SLO. This methodological procedure adopted was a qualitative, descriptive, and exploratory interviews with the communities located in rural areas of direct

  20. Reservoir operation under variable climate: Case of Rozva Dam, Zimbabwe

    NASA Astrophysics Data System (ADS)

    Ncube, S. P.; Makurira, H.; Kaseke, E.; Mhizha, A.

    The challenge of maintaining or improving the quality of rural livelihoods against the increasing threat of climate change (CC) and climate variability (CV) calls for the development of robust and tested systems, tools and procedures for the management of water resources. The research aimed at assessing reservoir operation under variable climate for Rozva Dam, a medium-sized reservoir in Zimbabwe. Rozva Dam is located in the Bikita District of Zimbabwe and has a full supply capacity of 2.8 Mm 3 at a maximum water level of 17.3 m. The research analysed 46 years of rainfall and temperature data to assess climate variability and or change. The CROPWAT model was used to estimate crop water requirements for the adjacent 80 hectare irrigation scheme. The WAFLEX model was applied to simulate the performance of the system under three scenarios: (1) existing demands and operational rules, (2) reduced water availability due to climate change, as predicted by the Ministry of Mines, but with increasing annual demands and (3) climate change situation coupled with change in irrigation technology. The results show a general decreasing linear trend for rainfall although the variance was not statistically significant at p = 0.05. A clearer cyclic pattern was observed for the decadal analysis. An increasing trend in both maximum and minimum temperature was observed although, again, these were not statistically significant with a Spearman’s rank correlation coefficient ( R sp) of below 0.5. The research used rainfall and temperature data as the basis for confirmation climate change and variability in the study area. Analyses show that the area is experiencing more of CV than CC. Modelling results show that the reservoir can satisfy current demands but will fail to cope under the forecasted increase in demand. The conclusions from the research are that the available water resources in the studied system are sufficient to satisfy the current demands. The predicted level of climate

  1. Designing case-control studies.

    PubMed Central

    Yanagawa, T

    1979-01-01

    Identification of confounding factors, evaluation of their influence on cause-effect associations, and the introduction of appropriate ways to account for these factors are important considerations in designing case-control studies. This paper presents designs useful for these purposes, after first providing a statistical definition of a confounding factor. Differences in the ability to identify and evaluate confounding factors and estimate disease risk between designs employing stratification (matching) and designs randomly sampling cases and controls are noted. Linear logistic models for the analysis of data from such designs are described and are shown to liberalize design requirements and to increase relative risk estimation efficiency. The methods are applied to data from a multiple factor investigation of lung cancer patients and controls. PMID:540588

  2. A case for case studies: exploring the use of case study design in community nursing research.

    PubMed

    Bergen, A; While, A

    2000-04-01

    The case study has become an accepted vehicle for conducting research in a variety of disciplines. However, the meaning behind the term is not always made explicit by researchers and this has given rise to a number of assumptions which are open to challenge, and to questions about the robustness of the method. This paper explores some of the issues arising from one particular definition of case study research, used in a study by Yin which examined the practice of case management in community nursing. Four main areas are discussed. First, defining 'case' is seen to pose questions about the relationship of the phenomenon to its context, the degree of researcher control over case definition, the limits to what may constitute a 'case' and what is meant by the term 'unit of analysis'. Second, the relevance of external validity to case study research is supported through the use of a number of tactics, in particular Yin's concept of replication logic, which involves generalizing to theory, rather than to empirical data. Third, the use of method triangulation (multiple methods of data collection) is advanced as a means of enhancing construct validity in research where data converge around a particular theory. Finally, the relationship of the case study to theory construction, through the prior development of 'propositions' is discussed. Each of these issues is applied to the design and conduct of a research study based closely on Yin's multiple case study framework. Thirteen 'cases' were selected of case management practice and data were collected through interviews and examination of literature and documentation, to explore the suitability of community nurses for the role. It is concluded that, given the appropriate subject matter, context and research aims, the case study method may be seen as a credible option in nursing research. PMID:10759989

  3. A case study of embarrassment.

    PubMed

    Dann, O T

    1977-01-01

    The psychoanalytic references to embarrassment are reviewed. Embarrassment, in the literature, is seen largely as an affect involving exhibitionistic and scopophilic conflicts and defenses against these. A case in which embarrassment was prominent is discussed. Embarrassment in the patient was an ego response which implied an external object for its manifestation. It involved exhibitionistic and scopophilic conflicts and projective defenses, but also operated in ego-gratifying and adaptive ways. Her embarrassment was understood through the analysis of an initial embarrassing dream of nakedness and other dreams and associated material as the defensive out-grouth of repeated exposures to the primal scene. Embarrassment was a resistance to remembering in the analysis, and the primal-scene experiences were partially reconstructed. The analytic situation was, in many ways, a symbolic re-creation of the primal scene, including the patient's response of embarrassment. The development of embarrassment in the patient's childhood was furthered and confirmed by its being an identification with the attitudes of both parents. Finally, some reflections on embarrassment and shame in its various forms are set forth. PMID:560404

  4. Operationally Efficient Propulsion System Study (OEPPS)

    NASA Technical Reports Server (NTRS)

    Wong, G. S.; Waldrop, G. S.; Byrd, R. J.; Ziese, J. M.

    1991-01-01

    A description is presented, through view graphs, of the problems encountered in today's launch vehicles and how these problems have adversely affected the ability to achieve serviceability, reliability, and operability. The need is emphasized to recognize and understand the operations problems and the effort that must be made to avoid them in future designs. Technology areas that will enhance operations requirements are also presented.

  5. An Optimization Study of Hot Stamping Operation

    NASA Astrophysics Data System (ADS)

    Ghoo, Bonyoung; Umezu, Yasuyoshi; Watanabe, Yuko; Ma, Ninshu; Averill, Ron

    2010-06-01

    In the present study, 3-dimensional finite element analyses for hot-stamping processes of Audi B-pillar product are conducted using JSTAMP/NV and HEEDS. Special attention is paid to the optimization of simulation technology coupling with thermal-mechanical formulations. Numerical simulation based on FEM technology and optimization design using the hybrid adaptive SHERPA algorithm are applied to hot stamping operation to improve productivity. The robustness of the SHERPA algorithm is found through the results of the benchmark example. The SHERPA algorithm is shown to be far superior to the GA (Genetic Algorithm) in terms of efficiency, whose calculation time is about 7 times faster than that of the GA. The SHERPA algorithm could show high performance in a large scale problem having complicated design space and long calculation time.

  6. Dynamic flood risk: case studies

    NASA Astrophysics Data System (ADS)

    Di Baldassarre, Giuliano

    2013-04-01

    While many progresses have been made in the static assessment of (current) flood risk, additional transdisciplinary research is required for the development of new methods for the dynamic assessment of (future) flood risk, which is very much needed in a rapidly changing environment. To this end, it is essential to understand why flood risk has changed in the past. This presentation shows the scientific outcomes of diverse case studies (the Po river in Italy and a number of African rivers), whereby data and models are utilized to analyse and interpret the dynamics of flood risk. In particular, a number of hypotheses were tested by considering different agents of change, such as climate and/or land-use, flood prevention measures, human population dynamics. These case studies show that one of the main challenges in assessing (dynamic) flood risk is the deep interconnection not only between the different agents of change, but also between the components of risk (i.e. hazard, exposure, vulnerability or resilience). For instance, changes in flood hazard often trigger changes in exposure and vulnerability to flooding, and vice versa. These complex interactions seem to make predictions of future flood risk over long time scales rather difficult, if not impossible.

  7. Aspect-Oriented Approach to Operating System Development Empirical Study

    NASA Astrophysics Data System (ADS)

    Kuusela, Jaakko; Tuominen, Harri

    This paper presents a case-study where a new programming technique is applied to an established branch of software development. The purpose of the study was to test whether or not aspect-oriented programming (AOP) could be used in operating systems development. Instead of any real world operating system an educational OS with the name Nachos was used. This was because Nachos is written in Java which makes it easy to introduce aspect-oriented techniques. In this paper a new file system for the Nachos OS is developed and then it is analyzed by profiling and metrics. The results show that it is possible to use AOP in OS development and that it is also beneficial to do so.

  8. Making the Traffic Operations Case for Congestion Pricing: Operational Impacts of Congestion Pricing

    SciTech Connect

    Chin, Shih-Miao; Hu, Patricia S; Davidson, Diane

    2011-02-01

    hours spent in traffic in a year, grew by 22% as the national average of hours spent in delay grew from 36 hours to 44 hours. Peak delay per traveler grew one-third in medium-size urban areas over the 10 year period. The traffic engineering community has developed an arsenal of integrated tools to mitigate the impacts of congestion on freeway throughput and performance, including pricing of capacity to manage demand for travel. Congestion pricing is a strategy which dynamically matches demand with available capacity. A congestion price is a user fee equal to the added cost imposed on other travelers as a result of the last traveler's entry into the highway network. The concept is based on the idea that motorists should pay for the additional congestion they create when entering a congested road. The concept calls for fees to vary according to the level of congestion with the price mechanism applied to make travelers more fully aware of the congestion externality they impose on other travelers and the system itself. The operational rationales for the institution of pricing strategies are to improve the efficiency of operations in a corridor and/or to better manage congestion. To this end, the objectives of this project were to: (1) Better understand and quantify the impacts of congestion pricing strategies on traffic operations through the study of actual projects, and (2) Better understand and quantify the impacts of congestion pricing strategies on traffic operations through the use of modeling and other analytical methods. Specifically, the project was to identify credible analytical procedures that FHWA can use to quantify the impacts of various congestion pricing strategies on traffic flow (throughput) and congestion.

  9. Ensuring Safety and Security for Avionics: A Case Study

    NASA Astrophysics Data System (ADS)

    Laarouchi, Y.; Deswarte, Y.; Powell, D.; Arlat, J.; De Nadai, E.

    2009-05-01

    We present a case study in the avionics context, in which bidirectional information flows exist between critical components and less critical ones. These flows raise security and safety concerns that have to be taken into account to guarantee correct operation of the critical tasks. To allow upwards flows, we propose fault tolerance mechanisms based on diverse operating systems isolated by virtualization.

  10. Approaches to Teaching: Adapting Cases in Operations Management for Use in the Technical Writing Classroom.

    ERIC Educational Resources Information Center

    Morrow, John

    1988-01-01

    Describes how technical writing teachers can adapt existing operations management cases for the writing classroom by recognizing communication gaps and filling them with appropriate writing scenarios. (ARH)

  11. Geometrical optics approximation modeling of laser measurements of an operating Bessemer-converter casing

    NASA Astrophysics Data System (ADS)

    Mihalev, Mihail; Parvanov, Orlin; Pirgov, Peter S.

    1996-12-01

    We report the use of computer techniques for modeling and visualization of the laser monitoring of the inner surface of an operating Bessemer converter. The purpose of the study was to estimate the accuracy of the laser measurement technique, to determine the geometrical parameters necessary, and to establish the requirements to the accuracy of the scanning part of a laser meter when the pulse duration, beam divergence and defects size are pre-set. The following basic conclusions can be drawn: firstly, it is possible to use a laser meter as a device for monitoring the casing thickness based on the use of a pulsed solid-state laser; secondly, the process of non-uniform wear can be handled by means of additional measurements with off-axis sounding geometry; thirdly, the numerical experiment demonstrates that, based on the accuracy achieved of determining the casing thickness, the operating life-time of the converter can be extended.

  12. Physical, Structural and Operational Vulnerability of Critical Facilities in Valle de Chalco Solidaridad, Estado de Mexico, Mexico. Case of study: Avándaro, San Isidro and El Triunfo

    NASA Astrophysics Data System (ADS)

    Garcia Payne, D. G.; Novelo-Casanova, D. A.; Ponce-Pacheco, A. B.; Espinosa-Campos, O.; Huerta-Parra, M.; Reyes-Pimentel, T.; Rodriguez, F.; Benitez-Olivares, I.

    2010-12-01

    Valle de Chalco Solidaridad is located in Mexico City Metropolitan Area in Estado de Mexico, Mexico. In this town there is a sewage canal called “La Compañía”. A wall of this canal collapsed on February 5, 2010 due to heavy rains creating the flooding of four surrounding communities. It is important to point out that this area is frequently exposed to floods. In this work, we consider a critical facility as an essential structure for performance, health care and welfare within a community or/and as a place that can be used as shelter in case of emergency or disaster. Global vulnerability (the sum of the three measured vulnerabilities) of the 25 critical facilities identified in the locations of Avándaro, San Isidro and El Triunfo was assessed using the Community Vulnerability Assessment Tool developed by the National Oceanic and Atmospheric Administration (NOAA). For each critical facility we determined its operational, structural and physical vulnerabilities. For our analysis, we considered the four main natural hazards to which Valle de Chalco is exposed: earthquakes, floods, landslides and sinking. We considered five levels of vulnerability using a scale from 1 to 5, where values range from very low to very high vulnerability, respectively. A critical facilities database was generated by collecting general information for three categories: schools, government and church. Each facility was evaluated considering its location in relation to identified high-risk areas. Our results indicate that in average, the global vulnerability of all facilities is low, however, there are particular cases in which this global vulnerability is high. The average operational vulnerability of the three communities is moderate. The global structural vulnerability (sum of the structural vulnerability for the four analyzed hazards) is moderate. In particular, the structural vulnerability to earthquakes is low, to landslides is very low, to flooding is moderate and to sinking is

  13. Design Evolution Study Thermal Operating Methodology

    SciTech Connect

    T.L. Mitchell

    2002-04-29

    This study provides results supporting the conclusion that the repository can be operated over a varying range of thermal modes and therefore temperatures. In particular, this work focused on limiting the peak, postclosure waste package surface temperature to less than 85 degrees Celsius, a possible limit due to corrosion considerations. These operating modes were compared by varying the waste package in drift spacing (0.1-2.83 meters), drift pitch (drift spacing centerline to centerline of 40-120 meters), ventilation duration (75-300 years), and ventilation efficiency (50-80%). The resulting graphical representation shows where the constant temperature of the waste package (85 degrees Celsius) lies with respect to drift pitch and waste package spacing. The waste considered in this study is the strict youngest fuel first 5 years old fuel. Using only strict youngest fuel first 5 years old fuel in the waste stream results in an average heat load per waste package of 12.48kW/Pkg. With this high average heat load, it is not possible to achieve a maximum waste package surface temperature of 85 degrees Celsius or less. By aging 63% of the strict youngest fuel first 5 years old fuel for 27 years, it becomes possible to maintain the waste package surface temperature at 85 degrees Celsius or less. The 27 years of aging comes from the fact that the repository could be closed in as little as 50 years. It takes 23 years to emplace the waste and therefore the last fuel received for emplacement is 27 years prior to closures. The strict youngest fuel first 5 years old fuel waste stream with 63% aged for 27 years, results in an average power level of 8.4kW/Pkg. This lower heat load allows the controlled parameters of drift pitch, waste package spacing, aging, and ventilation duration to be varied to achieve the desired results. This study compares the hot strict youngest fuel first 5 years old fuel to the previous waste stream, which has an average of 26-year-old fuel. The 26-year

  14. Case Study: A Picture Worth a Thousand Words? Making a Case for Video Case Studies

    ERIC Educational Resources Information Center

    Pai, Aditi

    2014-01-01

    A picture, they say, is worth a thousand words. If a mere picture is worth a thousand words, how much more are "moving pictures" or videos worth? The author poses this not merely as a rhetorical question, but because she wishes to make a case for using videos in the traditional case study method. She recommends four main approaches of…

  15. Operationally efficient propulsion system study (OEPSS) data book. Volume 6; Space Transfer Propulsion Operational Efficiency Study Task of OEPSS

    NASA Technical Reports Server (NTRS)

    Harmon, Timothy J.

    1992-01-01

    This document is the final report for the Space Transfer Propulsion Operational Efficiency Study Task of the Operationally Efficient Propulsion System Study (OEPSS) conducted by the Rocketdyne Division of Rockwell International. This Study task studied, evaluated and identified design concepts and technologies which minimized launch and in-space operations and optimized in-space vehicle propulsion system operability.

  16. [Uretero-vaginal fistulas: diagnosis and operative tactics. Apropos of 19 personal cases].

    PubMed

    Falandry, L

    1992-01-01

    Personal experience of the treatment of 19 uretero-vaginal fistulae, observed from september 1987 to june 1991 on 17 patients in Africa is described and analysed. Occurring after gynecological or obstetrical surgery, the main cause is hysterectomy (82.3%). Elements for diagnosis were: the appearance of a urine leak, which in most cases came rapidly, echography, and most important, intravenous urography (IVU). Surgical management in all of the cases was mainly aimed at conservation. One end-to-end anastomosis and 18 cuff reimplantations were performed, combined in 2 cases with a sub-mucus tunnel (Politano), in 14 cases combined with a tubular Boari bladder flap (wherein 1 case was bilateral), 3 combined with a bladder psoas hitch and 2 with an isolated ileal graft (ileo-uretero-cystoplasty). One case of vesicouterine fistula and 4 associated vesicovaginal fistulae benefited from a simultaneous surgical operation. In this study of 17 patients treated, except for one patient deceased 14 months following a neoplastic recurrence, the results were excellent. 16 patients were cured. Follow-up extended to more than a year and have shown the perfect conservation of the excretory ducts in all of the cases studied. The cuffed ureterovesical reimplantation combined with a tubular bladder plasty definitively seem to be a most reliable management technique for all ureter injury encountered. While allowing the preservation of the kidney located just below, it has, in particular, prevented ureter stenosis. If the use of simpler methods (psoas bladder hitch) may be sufficient for some cases, the use of more complex methods (ileo-uretero-cystoplasty) for other cases, may be indispensable. PMID:1474113

  17. The CZSaw notes case study

    NASA Astrophysics Data System (ADS)

    Lee, Eric; Gupta, Ankit; Darvill, David; Dill, John; Shaw, Chris D.; Woodbury, Robert

    2013-12-01

    Analysts need to keep track of their analytic findings, observations, ideas, and hypotheses throughout the analysis process. While some visual analytics tools support such note-taking needs, these notes are often represented as objects separate from the data and in a workspace separate from the data visualizations. Representing notes the same way as the data and integrating them with data visualizations can enable analysts to build a more cohesive picture of the analytical process. We created a note-taking functionality called CZNotes within the visual analytics tool CZSaw for analyzing unstructured text documents. CZNotes are designed to use the same model as the data and can thus be visualized in CZSaw's existing data views. We conducted a preliminary case study to observe the use of CZNotes and observed that CZNotes has the potential to support progressive analysis, to act as a shortcut to the data, and supports creation of new data relationships.

  18. STS Case Study Development Support

    NASA Technical Reports Server (NTRS)

    Rosa de Jesus, Dan A.; Johnson, Grace K.

    2013-01-01

    The Shuttle Case Study Collection (SCSC) has been developed using lessons learned documented by NASA engineers, analysts, and contractors. The SCSC provides educators with a new tool to teach real-world engineering processes with the goal of providing unique educational materials that enhance critical thinking, decision-making and problem-solving skills. During this third phase of the project, responsibilities included: the revision of the Hyper Text Markup Language (HTML) source code to ensure all pages follow World Wide Web Consortium (W3C) standards, and the addition and edition of website content, including text, documents, and images. Basic HTML knowledge was required, as was basic knowledge of photo editing software, and training to learn how to use NASA's Content Management System for website design. The outcome of this project was its release to the public.

  19. A study of actions in operative notes.

    PubMed

    Wang, Yan; Pakhomov, Serguei; Burkart, Nora E; Ryan, James O; Melton, Genevieve B

    2012-01-01

    Operative notes contain rich information about techniques, instruments, and materials used in procedures. To assist development of effective information extraction (IE) techniques for operative notes, we investigated the sublanguage used to describe actions within the operative report 'procedure description' section. Deep parsing results of 362,310 operative notes with an expanded Stanford parser using the SPECIALIST Lexicon resulted in 200 verbs (92% coverage) including 147 action verbs. Nominal action predicates for each action verb were gathered from WordNet, SPECIALIST Lexicon, New Oxford American Dictionary and Stedman's Medical Dictionary. Coverage gaps were seen in existing lexical, domain, and semantic resources (Unified Medical Language System (UMLS) Metathesaurus, SPECIALIST Lexicon, WordNet and FrameNet). Our findings demonstrate the need to construct surgical domain-specific semantic resources for IE from operative notes. PMID:23304423

  20. Using Case Studies To Teach Science.

    ERIC Educational Resources Information Center

    Gabel, Connie

    Using case studies in science instruction develops problem solving and enhances listening and cooperative learning skills. Unlike other disciplines such as law and medicine, the case study method is rarely used in science education to enrich the curriculum. This study investigates the use of content-based case studies as a means of developing…

  1. Auditing Operating Room Recycling: A Management Case Report.

    PubMed

    McGain, Forbes; Jarosz, Katherine Maria; Nguyen, Martin Ngoc Hoai Huong; Bates, Samantha; O'Shea, Catherine Jane

    2015-08-01

    Much waste arises from operating rooms (ORs). We estimated the practical and financial feasibility of an OR recycling program, weighing all waste from 6 ORs in Melbourne, Australia. Over 1 week, 237 operations produced 1265 kg in total: general waste 570 kg (45%), infectious waste 410 kg (32%), and recyclables 285 kg (23%). The achieved recycling had no infectious contamination. The achieved recycling/potential recycling rate was 285 kg/517 kg (55%). The average waste disposal costs were similar for general waste and recycling. OR recycling rates of 20%-25% total waste were achievable without compromising infection control or financial constraints. PMID:26230308

  2. Space transportation system biomedical operations support study

    NASA Technical Reports Server (NTRS)

    White, S. C.

    1983-01-01

    The shift of the Space Transportation System (STS) flight tests of the orbiter vehicle to the preparation and flight of the payloads is discussed. Part of this change is the transition of the medical and life sciences aspects of the STS flight operations to reflect the new state. The medical operations, the life sciences flight experiments support requirements and the intramural research program expected to be at KSC during the operational flight period of the STS and a future space station are analyzed. The adequacy of available facilities, plans, and resources against these future needs are compared; revisions and/or alternatives where appropriate are proposed.

  3. Analysis of 1014 consecutive operative cases to determine the utility of intraoperative neurophysiological data

    PubMed Central

    Hussain, Namath Syed

    2015-01-01

    Introduction: Intraoperative neurophysiological monitoring (IOM) during neurosurgical procedures has become the standard of care at tertiary care medical centers. While prospective data regarding the clinical utility of IOM are conspicuously lacking, retrospective analyses continue to provide useful information regarding surgeon responses to reported waveform changes. Methods: Data regarding clinical presentation, operative course, IOM, and postoperative neurological examination were compiled from a database of 1014 cranial and spinal surgical cases at a tertiary care medical center from 2005 to 2011. IOM modalities utilized included somatosensory evoked potentials, transcranial motor evoked potentials, pedicle screw stimulation, and electromyography. Surgeon responses to changes in IOM waveforms were recorded. Results: Changes in IOM waveforms indicating potential injury were present in 87 of 1014 cases (8.6%). In 23 of the 87 cases (26.4%), the surgeon responded by repositioning the patient (n = 12), repositioning retractors (n = 1) or implanted instrumentation (n = 9), or by stopping surgery (n = 1). Loss of IOM waveforms predicted postoperative neurological deficit in 10 cases (11.5% of cases with IOM changes). Conclusions: In the largest IOM series to date, we report that the surgeon responded by appropriate interventions in over 25% of cases during which there were IOM indicators of potential harm to neural structures. Prospective studies remain to be undertaken to adequately evaluate the utility of IOM in changing surgeon behavior. Our data is in agreement with previous observations in indicating a trend that supports the continued use of IOM. PMID:26396602

  4. [Follow-up and evolution of 10 cases operated on for total colonic aganglionosis].

    PubMed

    Casasa, J M; Marhuenda, C; Broto, J; Boix-Ochoa, J

    1990-04-01

    One hundred sixty-one cases of HIRSCHSPRUNG's disease have been operated on by us between 1966 and 1988. Of these, 19 were total colonic aganglionosis. Of eleven that underwent surgery before 1982, five are still alive. The eight that were operated on after 1982 have a good evolution. This report is a retrospective study of the clinical evolution in ten of the thirteen survivors. The ages are comprised between 21 and 2 1/2 years. We have reviewed their general condition, weight, height, tolerance to oral intake, stool frequency, general laboratory determinations, circulating iron, transferrin, transferrin saturation, absorption of vitamin B12 and folic acid, hydrogen test and stool examination. Except for one case, the others are in a perfect nutritional and growth condition. DUHAMEL's technique was employed in eight cases and REHBEIN's technique, in two. Given our good results, we think that LESTER-MARTIN's technique is unnecessary, except for that cases with extensive small bowel involvement due to the serious problems of absorption that this represents. PMID:2252851

  5. Necrotizing fasciitis – a rare complication following common obstetric operative procedures: report of two cases

    PubMed Central

    Medhi, Robin; Rai, Suditi; Das, Arpana; Ahmed, Mansur; Das, Banani

    2015-01-01

    Necrotizing fasciitis, a near-fatal soft-tissue infection complicating obstetric operative wounds, is a rare entity in obstetrics. Herein, we report two cases of necrotizing fasciitis in severely undernourished and anemic women following obstetric operative procedures. Both undernourishment and anemia compounded the already existing immune-suppressed state in pregnancy and may have lead to life-threatening necrotizing fasciitis. One of the patients developed necrotizing fasciitis following episiotomy and the other following cesarean section. Both the cases were diagnosed clinically. Management was done by total parenteral nutrition, prompt correction of anemia, and surgical debridement under broad-spectrum antibiotic coverage. The raw areas were later reconstructed by split skin grafting in the first case, whereas, in the second case, due to the patient’s refusal of skin grafting, the wound was allowed to heal by secondary intention. Both patients survived, although with morbidity. Our study aims to emphasize prompt correction of comorbidities along with aggressive management of necrotizing fasciitis for better outcomes in the obstetric population. Prompt correction of nutritional status improves the survival rate. PMID:25897266

  6. Allographic agraphia: A case study

    PubMed Central

    Menichelli, Alina; Rapp, Brenda; Semenza, Carlo

    2011-01-01

    We report the case of patient MN, diagnosed with frontotemporal dementia, who exhibited a severe impairment in writing letters and words in upper-case print in the face of accurate production of the same stimuli in lower-case cursive. In contrast to her written production difficulties, MN was unimpaired in recognizing visually presented letters and words in upper-case print. We find a modest benefit of visual form cueing in the written production of upper-case letters, despite an inability to describe or report visual features of letters in any case or font. This case increases our understanding of the allographic level of letter-shape representation in written language production. It provides strong support for previous reports indicating the neural independence of different types of case and font-specific letter-shape information; it provides evidence that letter-shape production does not require explicit access to information about the visual attributes of letter shapes and, finally, it reveals the possibility of interaction between processes involved in letter-shape production and perception. PMID:18489965

  7. Case Study: The Chemistry of Cocaine

    ERIC Educational Resources Information Center

    Dewprashad, Brahmadeo

    2011-01-01

    This column provides original articles on innovations in case study teaching, assessment of the method, as well as case studies with teaching notes. This month's case study focuses on the chemistry of cocaine to teach a number of core concepts in organic chemistry. It also requires that students read and analyze an original research paper on…

  8. Case Studies for Inclusive Schools. Second Edition

    ERIC Educational Resources Information Center

    Anderson, Peggy L.

    2005-01-01

    Case Studies for "Inclusive Schools, Second Edition" presents a sampling of case studies that contain realistic problems concerning inclusion issues for teacher education students to solve. This format was chosen because the case study approach to learning is gaining in popularity as it provides students with an opportunity to apply information…

  9. Business and Consumer Education Case Studies.

    ERIC Educational Resources Information Center

    Delta Pi Epsilon, Minneapolis, Minn. Phi Chapter.

    This publication contains 58 case studies for classroom use in teaching various business and consumer education subjects at the high school level. A supplement to a previous Phi Chapter publication, "Office Education Case Studies" (1973), the case studies are intended to create class discussions and help students acquire the ability to analyze…

  10. Case Study Evaluations: A Decade of Progress?

    ERIC Educational Resources Information Center

    Yin, Robert K.

    1997-01-01

    In the last 10 years, there has been increased use of case study methodology, with accompanying refinement and improvement of the methods. Case studies have become legitimate research methods in evaluation, but it is too soon to say whether improvements in methodology are really resulting in improvements in the case studies conducted. (SLD)

  11. National Environmental Change Information System Case Study

    NASA Technical Reports Server (NTRS)

    Goodman, S. J.; Ritschard, R.; Estes, M. G., Jr.; Hatch, U.

    2001-01-01

    The Global Hydrology and Climate Center and NASA's Marshall Space Flight Center conducted a fact-finding case study for the Data Management Working Group (DMWG), now referred to as the Data and Information Working Group (DIWG), of the U.S. Global Change Research Program (USGCRP) to determine the feasibility of an interagency National Environmental Change Information System (NECIS). In order to better understand the data and information needs of policy and decision makers at the national, state, and local level, the DIWG asked the case study team to choose a regional water resources issue in the southeastern United States that had an impact on a diverse group of stakeholders. The southeastern United States was also of interest because the region experiences interannual climatic variations and impacts due to El Nino and La Nina. Jointly, with input from the DIWG, a focus on future water resources planning in the Apalachicola-Chattahoochee-Flint (ACF) River basins of Alabama, Georgia, and Florida was selected. A tristate compact and water allocation formula is currently being negotiated between the states and U.S. Army Corps of Engineers (COE) that will affect the availability of water among competing uses within the ACF River basin. All major reservoirs on the ACF are federally owned and operated by the U.S. Army COE. A similar two-state negotiation is ongoing that addresses the water allocations in the adjacent Alabama-Coosa-Tallapoosa (ACT) River basin, which extends from northwest Georgia to Mobile Bay. The ACF and ACT basins are the subject of a comprehensive river basin study involving many stakeholders. The key objectives of this case study were to identify specific data and information needs of key stakeholders in the ACF region, determine what capabilities are needed to provide the most practical response to these user requests, and to identify any limitations in the use of federal data and information. The NECIS case study followed the terms of reference

  12. Concentrated photovoltaics, a case study

    NASA Astrophysics Data System (ADS)

    Antonini, Piergiorgio; Centro, Sandro; Golfetto, Stelvio; Saccà, Alessandro

    2014-12-01

    Concentrated Photovoltaics (CPV), once a niche technology, has now reached the maturity and reliability for large scale power generation. Especially in regions where temperatures are very high, the use of high efficiency triple junction solar cells with concentrating optics allows stable energy yield. Thus CPV can be seen as complementary and not in concurrence with silicon photovoltaics. The state of the art, the advantages and limitations of this technology will be shown. Among the main advantages of CPV is the possibility of a much higher energy supply, when compared to silicon photovoltaics, both comparing CPV and silicon with same area or the same installed power. The use of recycled and recyclable materials allows a more environmentally friendly production. The possibility to couple CPV with desalination facilities, energy storage will be analysed. As an example a case study of a CPV installation in Northern Italy is discussed. Here the use of mature technologies, derived from automotive and lighting sectors resulted in a simple and efficient module.

  13. IUS/TUG orbital operations and mission support study. Volume 3: Space tug operations

    NASA Technical Reports Server (NTRS)

    1975-01-01

    A study was conducted to develop space tug operational concepts and baseline operations plan, and to provide cost estimates for space tug operations. Background data and study results are presented along with a transition phase analysis (the transition from interim upper state to tug operations). A summary is given of the tug operational and interface requirements with emphasis on the on-orbit checkout requirements, external interface operational requirements, safety requirements, and system operational interface requirements. Other topics discussed include reference missions baselined for the tug and details for the mission functional flows and timelines derived for the tug mission, tug subsystems, tug on-orbit operations prior to the tug first burn, spacecraft deployment and retrieval by the tug, operations centers, mission planning, potential problem areas, and cost data.

  14. IUS/TUG orbital operations and mission support study. Volume 2: Interim upper stage operations

    NASA Technical Reports Server (NTRS)

    1975-01-01

    Background data and study results are presented for the interim upper stage (IUS) operations phase of the IUS/tug orbital operations study. The study was conducted to develop IUS operational concepts and an IUS baseline operations plan, and to provide cost estimates for IUS operations. The approach used was to compile and evaluate baseline concepts, definitions, and system, and to use that data as a basis for the IUS operations phase definition, analysis, and costing analysis. Both expendable and reusable IUS configurations were analyzed and two autonomy levels were specified for each configuration. Topics discussed include on-orbit operations and interfaces with the orbiter, the tracking and data relay satellites and ground station support capability analysis, and flight control center sizing to support the IUS operations.

  15. Specific SPS construction studies: Operations and maintenance

    NASA Technical Reports Server (NTRS)

    Miller, K. H.

    1980-01-01

    Surface as well as in-space operations of the solar power satellite program are addressed. The primary end products of SPS industrial enterprise are shown SPS and its ground receiving antenna every six months; and (3) construction of electric cargo orbital transfer vehicles. The production of photovoltaic cells and solar blankets is also considered.

  16. Demystifying Instructional Innovation: The Case of Teaching with Case Studies

    ERIC Educational Resources Information Center

    Kantar, Lina D.

    2013-01-01

    Issues emerging from instructional innovation are inevitable, yet basing any curriculum shift on a theoretical framework is paramount. This paper grounds the case-based pedagogy in three learning theories: behaviorism, cognitivism, and constructivism. The three theories are described and situated in relation to the case study method. An…

  17. The case study of biomaterials and biominerals

    NASA Astrophysics Data System (ADS)

    Del Hoyo Martínez, Carmen

    2013-04-01

    The teaching of biomaterials as case study by on-line platform , susceptible to develop both individually and in groups, got different objectives proposed by the European Higher Education System, among which include: participate actively in the teaching-learning process by students, interpreting situations, adapt processes and solutions. It also improves oral and written communication, analytical skills and synthesis and also the ability to think critically. Biomaterials have their origin in biominerals. These are solid inorganic compounds of defined structure, consisting of molecular control mechanisms that operate in biological systems. Its main functions are: structural support, a reservoir of essential elements, sensors, mechanical protection and storage of toxic elements. Following the demand of materials compatible with certain functional systems of our body, developed biomaterials. Always meet the condition of biocompatibility. Should be tolerated by the body and do not provoke rejection. This involves a comprehensive study of physiological conditions and the anatomy of the body where a biomaterial has to be implemented. The possibility of generating new materials from biominerals has a major impact in medicine and other fields could reach as geology, construction, crystallography, etc. While the study of these issues is in its infancy today, can be viewed as an impact on the art and future technology. Planning case study that students would prepare its report for discussion in subgroups. Occurs then the pooling of individual analysis, joint case discussion and adoption by the subgroup of a consensual solution to the problem. The teacher as facilitator and coordinator of the final case analysis, sharing leads to group-wide class and said the unanimous decision reached by the students and gives his opinion on the resolution of the case. REFERENCES D.P. Ausubel. Psicología Educativa. Un punto de vista cognoscitivo. Trillas. Ed. 1983. E.W. Eisner. Procesos

  18. Case Studies for Effective Business Instruction.

    ERIC Educational Resources Information Center

    McAlister-Kizzier, Donna

    This book is designed as a resource for educators who teach business content in a variety of instructional settings. It contains case studies representing all functional areas of business, including corporate training, for grades 7 through graduate education. Chapter 1 provides an overview of the case study method. The history of the case method,…

  19. Pull remanufacturing: A case study

    SciTech Connect

    Levine, L.O.

    1992-09-01

    This paper describes how pull production methods have been applied to a manual transmission remanufacturing line at Tooele Army Depot in Utah. The paper emphasizes techniques for linking the control of disassembly and cleaning operations to the repair and assembly portions of the production system (PP C). The primary objective is to show that production planning and control can be simplified when pull mechanisms are combined with shop floor improvements. One approach to applying MRP II to remanufacturing is to use a separate production schedule for the disassembly and assembly portions of the operation. This approach is primarily needed when managing the delivery and inventory of cores is critical to the successful operation of a remanufacturing organization. Because Army depots frequently have an adequate inventory of cores on hand (somewhere on-site), this requirement is usually less significant. Therefore, it is possible to eliminate the use of a master production schedule for disassembly and rely on pull linkages from the repair and assembly operations to control the activity of the disassembly and cleaning operations. In remanufacturing environments having multiple products and adequate buffers of core inventory, effective coordination of disassembly and cleaning functions with assembly production requirements becomes a key production control issue.

  20. Pull remanufacturing: A case study

    SciTech Connect

    Levine, L.O.

    1992-09-01

    This paper describes how pull production methods have been applied to a manual transmission remanufacturing line at Tooele Army Depot in Utah. The paper emphasizes techniques for linking the control of disassembly and cleaning operations to the repair and assembly portions of the production system (PP&C). The primary objective is to show that production planning and control can be simplified when pull mechanisms are combined with shop floor improvements. One approach to applying MRP II to remanufacturing is to use a separate production schedule for the disassembly and assembly portions of the operation. This approach is primarily needed when managing the delivery and inventory of cores is critical to the successful operation of a remanufacturing organization. Because Army depots frequently have an adequate inventory of cores on hand (somewhere on-site), this requirement is usually less significant. Therefore, it is possible to eliminate the use of a master production schedule for disassembly and rely on pull linkages from the repair and assembly operations to control the activity of the disassembly and cleaning operations. In remanufacturing environments having multiple products and adequate buffers of core inventory, effective coordination of disassembly and cleaning functions with assembly production requirements becomes a key production control issue.

  1. Operationally Efficient Propulsion System Study (OEPSS) data book. Volume 3: Operations technology

    NASA Technical Reports Server (NTRS)

    Vilja, John O.

    1990-01-01

    The study was initiated to identify operational problems and cost drivers for current propulsion systems and to identify technology and design approaches to increase the operational efficiency and reduce operations costs for future propulsion systems. To provide readily usable data for the Advanced Launch System (ALS) program, the results of the OEPSS study were organized into a series of OEPSS Data Books. This volume describes operations technologies that will enhance operational efficiency of propulsion systems. A total of 15 operations technologies were identified that will eliminate or mitigate operations problems described in Volume 2. A recommended development plan is presented for eight promising technologies that will simplify the propulsion system and reduce operational requirements.

  2. Ergonomic study of an operator's work of a molybdenum plant.

    PubMed

    Oñate, Esteban; Meyer, Felipe

    2012-01-01

    This study was part of an ergonomic program which is being carried out through an agreement between the University of Concepción and a Chilean private mining company. The purpose of this case study was to identify working conditions in which the physical and mental workload could be over the capabilities of the operator. He was responsible for loading trucks with sacks of molybdenum and for downloading reagents and handles them. The methods employed in this study included electronic records, interviews, surveys, review of the company standards, a time study and physical and mental workload analysis. Results showed that 84% of the time the operator was carrying out principal and secondary activities and no break periods were detected. It was found that the pace of work and the shift system generated unfavorable conditions by imbalance in the workload on the different days of the week. In the light of the results recommendations were made for a number of ergonomic changes. Most of them were accepted by the company. The most important achievement was a change in the shift system. The overload of the operator was due to the fact that he was in a shift working 5 days and resting on weekends. The imbalance was mainly because the work of the week end was accumulated for Monday. As a result of the study, the company contracted a second worker for this job and adopted a 7x7 shift system, meaning that they work seven days and rest seven days. An evaluation carried out two month after adopting the new shift revealed that changes were well accepted by the worker. PMID:22317731

  3. Sharing Cookies: A Case Study

    ERIC Educational Resources Information Center

    Salls, Jenny

    2014-01-01

    Rational number interpretations can include part-whole, measure, ratio, quotient, and operator. These are all subconstructs of partitioning (Barnett-Clarke et al. 2010; Behr et al. 1980; Clarke, Roche, and Mitchell 2008; Flores, Samson, and Yanik 2006). Each of these subconstructs uses different cognitive skills (Driscoll 1984), so it is important…

  4. A Distance Learning Case Study.

    ERIC Educational Resources Information Center

    Boord, Patricia M.

    1998-01-01

    To address diminishing resources and increased training demands, the Operational Training Unit (OTU) of the Federal Bureau of Investigation has saved almost $2 million by developing a distance education course to replace one full week of training at the FBI Academy. Discussion focuses on major issues faced by OTU in designing/delivering this…

  5. Strategically Focused Training in Six Sigma Way: A Case Study

    ERIC Educational Resources Information Center

    Pandey, Ashish

    2007-01-01

    Purpose: The purpose of the current study is to examine the utility of Six Sigma interventions as a performance measure and explore its applicability for making the training design and delivery operationally efficient and strategically effective. Design/methodology/approach: This is a single revelatory case study. Data were collected from multiple…

  6. Sustainability of Social Programs: A Comparative Case Study Analysis

    ERIC Educational Resources Information Center

    Savaya, Riki; Spiro, Shimon; Elran-Barak, Roni

    2008-01-01

    The article reports on the findings of a comparative case study of six projects that operated in Israel between 1980 and 2000. The study findings identify characteristics of the programs, the host organizations, and the social and political environment, which differentiated programs that are sustained from those that are not. The findings reaffirm…

  7. A case of arterial switch operation with coronary elongation technique.

    PubMed

    Matsuba, Tomoyuki; Shigehisa, Yoshiya; Imagama, Itsumi; Imoto, Yutaka

    2016-12-01

    A 28-day-old infant with D-transposition of the great arteries underwent arterial switch operation. The coronary pattern was Yacoub type A, in which coronary transfer is usually thought to be easy. However, a dominant conus branch diverged from the proximal portion of the left coronary artery (LCA). Moreover, the LCA ostium itself was near the remote commissure in sinus 1, very far from the target re-implantation point. All of these conditions made LCA transfer very difficult. We used a coronary elongation technique to solve this problem. An inverted U-shaped flap was made in the wall of the neoaorta, and the LCA cuff was anastomosed to this flap (the inferior half from the neoaortic flap and the superior half from the LCA cuff). To prevent compression of the LCA, the neopulmonary trunk was shifted rightward. Postoperative echocardiography showed good left ventricular wall motion, and the LCA was easily visualized on chest computed tomography, with no compression from the neopulmonary artery. PMID:26943683

  8. Learning from what went wrong--two case studies.

    PubMed

    Grotefendt, Rande H; Chastain, J Wayne

    2004-11-11

    Safer design of process equipment can protect against unexpected events. Two case studies involving the design of a process vessel and the subsequent events will be reviewed. One case study will show how the original design minimized equipment damage from an operational error, and how additional safeguards will prevent recurrence. The second case study will show that over time small process changes can lead to an unexpected chemical reaction that results in a vessel rupture. We will also cover the additional safeguards added to prevent recurrence. PMID:15518972

  9. Neurology Case Studies: Cerebrovascular Disease.

    PubMed

    Farooq, Muhammad U; Gorelick, Philip B

    2016-08-01

    This article discusses interesting vascular neurology cases including the management of intracranial stenosis, migraine headache and stroke risk, retinal artery occlusions associated with impaired hearing, intracranial occlusive disease, a heritable cause of stroke and vascular cognitive impairment, and an interesting clinico-neuroradiologic disorder associated with eclampsia. PMID:27445238

  10. Microcomputer versus mainframe simulations: A case study

    NASA Technical Reports Server (NTRS)

    Bengtson, Neal M.

    1988-01-01

    The research was conducted to two parts. Part one consisted of a study of the feasibility of running the Space Transportation Model simulation on an office IBM-AT. The second part was to design simulation runs so as to study the effects of certain performance factors on the execution of the simulation model. The results of this research are given in the two reports which follow: Microcomputer vs. Mainframe Simulation: A Case Study and Fractional Factorial Designs of Simulation Runs for the Space Transportation System Operations Model. In the first part, a DOS batch job was written in order to simplify the execution of the simulation model on an office microcomputer. A comparison study was then performed of running the model on NASA-Langley's mainframe computer vs. running on the IBM-AT microcomputer. This was done in order to find the advantages and disadvantages of running the model on each machine with the objective of determining if running of the office PC was practical. The study concluded that it was. The large number of performance parameters in the Space Transportation model precluded running a full factorial design needed to determine the most significant design factors. The second report gives several suggested fractional factorial designs which require far fewer simulation runs in order to determine which factors have significant influence on results.

  11. High Penetration Photovoltaic Case Study Report

    SciTech Connect

    Bank, J.; Mather, B.; Keller, J.; Coddington, M.

    2013-01-01

    Technical concerns with integrating higher penetrations of photovoltaic (PV) systems include grid stability, voltage regulation, power quality (voltage rise, sags, flicker, and frequency fluctuations), and protection and coordination. The current utility grid was designed to accommodate power flows from the central generation source to the transmission system and eventually to the distribution feeders. At the distribution level, the system was designed to carry power from the substation toward the load. Renewable distributed generation, particularly solar PV, provides power at the distribution level challenging this classical paradigm. As these resources become more commonplace the nature of the distribution network and its operation is changing to handle power flow in both directions. This report is focused on large PV installations in which penetration is significantly greater than 15% of maximum daytime feeder load. These case studies are intended to demonstrate success stories with integration of large PV plants at the distribution level as well as some of the solutions used by the utility to ensure safe, reliable operation of both the PV system and the distribution network.

  12. Building Energy Information Systems: User Case Studies

    SciTech Connect

    Granderson, Jessica; Piette, Mary Ann; Ghatikar, Girish

    2010-03-22

    Measured energy performance data are essential to national efforts to improve building efficiency, as evidenced in recent benchmarking mandates, and in a growing body of work that indicates the value of permanent monitoring and energy information feedback. This paper presents case studies of energy information systems (EIS) at four enterprises and university campuses, focusing on the attained energy savings, and successes and challenges in technology use and integration. EIS are broadly defined as performance monitoring software, data acquisition hardware, and communication systems to store, analyze and display building energy information. Case investigations showed that the most common energy savings and instances of waste concerned scheduling errors, measurement and verification, and inefficient operations. Data quality is critical to effective EIS use, and is most challenging at the subsystem or component level, and with non-electric energy sources. Sophisticated prediction algorithms may not be well understood but can be applied quite effectively, and sites with custom benchmark models or metrics are more likely to perform analyses external to the EIS. Finally, resources and staffing were identified as a universal challenge, indicating a need to identify additional models of EIS use that extend beyond exclusive in-house use, to analysis services.

  13. Case Studies for Management Development in Bangladesh.

    ERIC Educational Resources Information Center

    McLean, Gary N.

    Eight case studies appropriate for use in a course in management development were prepared and are provided in this document. The typical case describes a real business situation in which a real manager had to reach a decision. The case gives quantitative and qualitative information that is, or may be, relevant to that decision. Questions for…

  14. Study on Case Teaching of Financial Management

    ERIC Educational Resources Information Center

    Che, Zhenghong; Che, Zhengmei

    2011-01-01

    Case teaching is an efficient teaching method of management. It plays an important role to enhance the students' ability to practice the theory. However, case teaching of financial management has not achieved the expected results. The paper aims to study the importance, characteristics and corresponding methods of case teaching method of financial…

  15. A flash from the past: a case on long term follow-up of a "corridor" operation.

    PubMed

    Ricciardi, Danilo; Sarkozy, Andrea; Wauters, Kristel; Brugada, Pedro

    2013-01-01

    An electrophysiological study in a patient with a previous corridor operation was performed because of syncope. The atrial electrograms showed the persistence of the sinus rhythm in the right atrial corridor despite an organized atrial fibrillation in the left atrium. The first case described of a long term follow-up in a corridor operation, one of the first described surgical approach for the treatment of atrial fibrillation, that gave the beginning to the non-pharmacological approach of this arrhythmia. PMID:23174503

  16. Non-invasive respiratory volume monitoring to detect apnea in post-operative patients: case series.

    PubMed

    Voscopoulos, Christopher; Ladd, Diane; Campana, Lisa; George, Edward

    2014-06-01

    Obstructive sleep apnea (OSA) is a potential independent risk factor for postoperative complications, adverse surgical outcomes, and longer hospital stays. Obese patients with OSA have increased post-operative complications. An estimated 25-30% of pre-operative patients are at a high risk for OSA. A novel, non-invasive respiratory volume monitor (RVM) has been developed to provide a real time respiratory curve demonstrating lung volumes as well as a continuous, display of minute ventilation, tidal volume and respiratory rate. Clinical application of this device in the post-anesthesia care unit (PACU) can "unmask" post-operative apneic events resulting from partial or complete airway collapse due to the residual effects of narcotic administration and volatile and/or intravenous anesthetics. Clinical examples from two patients, one with known OSA and one without a previous diagnosis of OSA, monitored in the PACU with RVM are presented here. Post-operatively both patients had an increase in apneic episodes with significant decreases in their MV during apneic episodes after opioid administration as compared to pre-op baseline. In addition, oxygen saturation, for both patients, which is an essential component of current respiratory monitoring remained normal in the cases presented, despite the significant decreases in MV. Continuous RVM monitoring demonstrates both changes in respiratory patterns and overall adequacy of ventilation, and allows practitioners to quantify the increase in the number and duration apneic episodes as a response to narcotic administration. These case studies demonstrate that a non-invasive respiratory volume monitoring system can detect and quantify respiratory disturbances that currently go undetected. PMID:24734148

  17. Utility robotic planning: case studies

    SciTech Connect

    Roman, H.T.; Travato, S.A.; Irving, T.L.; Patnaude, L.G.

    1986-03-01

    Currently, the utility use of robotic devices is most appropriate in nuclear power plants. Four utilities are currently approaching the task of robotic applications. The planning program of each of the utilities is discussed. The following similarities of approach are noted: Plant operating personnel are surveyed for application ideas, and a company task force is established involving these personnel to determine specific application needs and cost-benefit. The state-of-the-art of various robotic devices is evaluated and selected equipment is tested in existing plants. The robotic experience gained from nuclear plant applications is extended to other non-nuclear areas. 2 figures, 1 table.

  18. Academic Planning: Four Institutional Case Studies.

    ERIC Educational Resources Information Center

    Kieft, Raymond N.

    As part of a project studying intrainstitutional planning, management, and evaluation, four case studies were undertaken in 1976 of academic planning at Villa Maria College, Kansas City Metropolitan Community College District, West Virginia University, and Western Washington University. The case studies were part of an ongoing project, the…

  19. Is the Species Flock Concept Operational? The Antarctic Shelf Case

    PubMed Central

    Lecointre, Guillaume; Améziane, Nadia; Boisselier, Marie-Catherine; Bonillo, Céline; Busson, Frédéric; Causse, Romain; Chenuil, Anne; Couloux, Arnaud; Coutanceau, Jean-Pierre; Cruaud, Corinne; d'Acoz, Cédric d'Udekem; De Ridder, Chantal; Denys, Gael; Dettaï, Agnès; Duhamel, Guy; Eléaume, Marc; Féral, Jean-Pierre; Gallut, Cyril; Havermans, Charlotte; Held, Christoph; Hemery, Lenaïg; Lautrédou, Anne-Claire; Martin, Patrick; Ozouf-Costaz, Catherine; Pierrat, Benjamin; Pruvost, Patrice; Puillandre, Nicolas; Samadi, Sarah; Saucède, Thomas; Schubart, Christoph; David, Bruno

    2013-01-01

    There has been a significant body of literature on species flock definition but not so much about practical means to appraise them. We here apply the five criteria of Eastman and McCune for detecting species flocks in four taxonomic components of the benthic fauna of the Antarctic shelf: teleost fishes, crinoids (feather stars), echinoids (sea urchins) and crustacean arthropods. Practical limitations led us to prioritize the three historical criteria (endemicity, monophyly, species richness) over the two ecological ones (ecological diversity and habitat dominance). We propose a new protocol which includes an iterative fine-tuning of the monophyly and endemicity criteria in order to discover unsuspected flocks. As a result nine « full » species flocks (fulfilling the five criteria) are briefly described. Eight other flocks fit the three historical criteria but need to be further investigated from the ecological point of view (here called « core flocks »). The approach also shows that some candidate taxonomic components are no species flocks at all. The present study contradicts the paradigm that marine species flocks are rare. The hypothesis according to which the Antarctic shelf acts as a species flocks generator is supported, and the approach indicates paths for further ecological studies and may serve as a starting point to investigate the processes leading to flock-like patterning of biodiversity. PMID:23936311

  20. Case Studies in Neurocritical Care.

    PubMed

    Sakusic, Amra; Rabinstein, Alejandro A

    2016-08-01

    The practice of neurocritical care encompasses multiple acute neurologic and neurosurgical diseases and requires detailed knowledge of neurology and critical care. This article presents 5 cases that illustrate just some of the conditions encountered in the daily practice of neurocritical care and exemplify some of the common diagnostic, therapeutic, and prognostic challenges facing the neurointensivist. Life-threatening medical complications after severe acute ischemic stroke, seizures and extreme agitation from autoimmune encephalitis, refractory seizures after subdural hemorrhage, neurologic and systemic complications related to aneurysmal subarachnoid hemorrhage, and status epilepticus after cardiac arrest are discussed in this article. PMID:27445248

  1. Composites in manufacturing - Case studies

    SciTech Connect

    Strong, A.B. )

    1991-01-01

    The papers presented in this volume focus on 19 cases of applied technology in composites design and manufacturing, all of them dealing with specific products. Topics covered include design using composite in aerospace, innovative materials and processing, tooling, fasteners and adhesives, finishing, repair, specialty applications of composites, and applications in the automotive industry. Papers are presented on the filament winding of isogrid fuselage structures; design and use of aramid fiber in aircraft structures; resin transfer molding of a complex composite aircraft structure; and field repair of an advanced helicopter vertical fin structure.

  2. Case studies in conservation science

    NASA Astrophysics Data System (ADS)

    Bisulca, Christina

    The research presented in this dissertation covers three separate topics of conservation as defined by the National Science Foundation: 1) Materials Stabilization, Strengthening, Monitoring, and Repair; 2. Understanding Material Degradation and Aging; and 3) Materials and Structural Characterization of Cultural Heritage Objects (the 'technical study'). The first topic is addressed through a study to assess the consolidant tetraethoxysilane for the stabilization of alum treated wood. Falling under materials degradation studies is a study published in American Museum Novitates to understand how environmental conditions affect the aging of fossil resins from five different deposits. Two separate studies are included in technical study of cultural heritage objects which comprises the third research area of materials characterization. The first is a survey of red dyes used in Chinese paintings from the Ming Dynasty to the Early Republic (1364-1911). The second is a study of the pigments, dyes and binders used in Hawaiian barkcloth (kapa) from the 19th century.

  3. Maintenance and Operations study for K basins sludge treatment

    SciTech Connect

    WESTRA, A.G.

    1998-11-30

    This study evaluates maintenance and operating concepts for the chemical treatment of sludge from the 100 K Basins at Hanford. The sludge treatment equipment that will require remote operation or maintenance was identified. Then various maintenance and operating concepts used in the nuclear industry were evaluated for applicability to sludge treatment. A hot cell or cells is recommended as the best maintenance and operating concept for a sludge treatment facility.

  4. Behavioral Treatment of Hysterical Coughing and Mutism: A Case Study

    ERIC Educational Resources Information Center

    Munford, Paul R.; And Others

    1976-01-01

    This case study demonstrates the value of conceptualizing functional somatic disorders as operants. The subject, an adolescent girl, diagnosed as having a "hysterical neurosis," manifested the symptoms of incessant coughing and mutism. The cough and mutism were treated by extinction and shaping, respectively. Positive results were obtained.…

  5. Training Factory Workers: Three Case Studies. Contractor Report.

    ERIC Educational Resources Information Center

    Hirschhorn, Larry D.

    Case studies examined the context and impact of training in three factories: a bakery, a circuit assembly plant, and a plant that produces microchips. Cookie-Foods, Inc. used Statistical Process Control (SPC) and a course on problem solving to increase the operators' productivity. Impact of the SPC program was limited, because workers who…

  6. Globalization Contextualized: An Organization-Environment Case Study

    ERIC Educational Resources Information Center

    Frost, Robert A.

    2009-01-01

    Over the past two decades, changes in higher education, the emerging global economy, and other social changes all influence the environment in which community colleges operate. This article investigates leadership perceptions of adaptation to a rapidly globalizing education environment. Data were collected through a multisite case study that…

  7. Case-Control Study of Writer's Cramp

    ERIC Educational Resources Information Center

    Roze, E.; Soumare, A.; Pironneau, I.; Sangla, S.; de Cock, V. Cochen; Teixeira, A.; Astorquiza, A.; Bonnet, C.; Bleton, J. P.; Vidailhet, M.; Elbaz, A.

    2009-01-01

    Task-specific focal dystonias are thought to be due to a combination of individual vulnerability and environmental factors. There are no case-control studies of risk factors for writer's cramp. We undertook a case-control study of 104 consecutive patients and matched controls to identify risk factors for the condition. We collected detailed data…

  8. A Constructive Controversy Approach to "Case Studies"

    ERIC Educational Resources Information Center

    Bird, Sharon R.; Erickson, Karla A.

    2010-01-01

    On the basis of analysis of student responses to a case study titled "Drinks and Dinner," the authors evaluate the pedagogical potential of using constructive controversy case studies to teach about inequality. "Drinks and Dinner" is designed to capture the complexity of social interactions that defy simple solutions to engage students in…

  9. Self-Employment Training Programs: Case Studies.

    ERIC Educational Resources Information Center

    Lamb, Melissa, Ed.; And Others

    This self-employment training program case study booklet has been developed for general use in exploring the feasibility of this kind of development tool. The case studies describe a number of comprehensive, self-employment training and assistance programs, from the local to the national level. Chapter II includes information on the training plan,…

  10. Chemical Case Studies: Science-Society "Bonding."

    ERIC Educational Resources Information Center

    Hofstein, Avi; Nae, Nehemia

    1981-01-01

    Describes a unit designed to illustrate the "science-society-technology connection," in which three case studies of the chemical industry in Israel are presented to high school chemistry students. Chosen for the unit are case studies on copper production in Timna, on plastics, and on life from the Dead Sea. (CS)

  11. Twenty Techniques for Teaching with Case Studies

    ERIC Educational Resources Information Center

    Sudzina, Mary R.

    2005-01-01

    Problem-based learning and teaching with case studies are instructional approaches that are increasingly being applied in a variety of disciplines, such as business, law, medicine, and education. Instructors who have experienced traditional, teacher-centered instruction are often looking for ways to successfully integrate case studies, a…

  12. Using Case Studies: An International Approach

    ERIC Educational Resources Information Center

    McClam, Tricia; Woodside, Marianne

    2005-01-01

    Case studies as an instructional strategy have been used in many disciplines, including law, teacher education, science, medicine, and business. Among the benefits of this method of instruction are involving students in learning, developing their critical thinking skills, promoting communication, and engaging in critical analysis. Case studies are…

  13. Library Media Center Problems: Case Studies.

    ERIC Educational Resources Information Center

    Coburn, Louis

    Problems which arise in school library media centers are considered, using the case study method. The 30 case studies cover: problems in child management; the librarian's role in reading instruction and guidance, and in teaching library skills; conflicting opinions on the management and objectives of the media center; the librarian's role and job…

  14. Collaboration in Distance Education. International Case Studies.

    ERIC Educational Resources Information Center

    Moran, Louise, Ed.; Mugridge, Ian, Ed.

    This book contains nine case studies of collaboration in distance education. The case studies focus on such aspects of collaboration in distance education as the following: roles of individual institutional partners; importance of personal relationships; benefits of collaboration to individual partners; conflicts between collaboration and…

  15. Teaching Case Studies: A Collaborative Approach.

    ERIC Educational Resources Information Center

    Buffington, James R.; Harper, Jeffrey S.

    Many of the Association to Advance Collegiate Schools of Business (AACSB) accredited schools require undergraduate Management Information Systems (MIS) majors to take a course in the management of information technology. Over half of these schools utilize case studies in the teaching of this course. The authors emphasize that case studies are an…

  16. A Case Study of "Empathetic Teaching Artistry"

    ERIC Educational Resources Information Center

    Risner, Doug

    2014-01-01

    This case study is one of twenty cases derived from Anderson and Risner's international study of teaching artists in dance, and theatre, which investigated participants' (n=172) artistic and academic preparation in dance, and theatre, initial entry into the teaching artist field, rewards, challenges, and obstacles in participants'…

  17. Case Studies for Teaching Students with Dyslexia

    ERIC Educational Resources Information Center

    Macnamara, Gael R.

    2004-01-01

    This easy-to-use book of case studies helps you recognize the signs of dyslexia and prescribe effective teaching strategies for students with dyslexia. It includes a Case Study Analysis Sheet so you can work through important aspects of a student's personal, academic, and social life. You can then compare what you've compiled to the author's…

  18. Is Pain Suffering? A Case Study

    ERIC Educational Resources Information Center

    Black, Helen K.

    2007-01-01

    In this article, the case study of an elderly woman shows how bodily pain and suffering meld in her narrative, not as the subjective and objective sides of the same event, but as distinct experiences in which both constructs emerge separately or come together based on the meaning she imputes to the event. The case study shows the clear…

  19. Iowa College Student Aid Commission Case Study

    ERIC Educational Resources Information Center

    Leigh, Rachel A.

    2007-01-01

    The purpose of this descriptive case study was to trace the policy production process of a state agency, the Iowa College Student Aid Commission (Commission), to its function today. This case study relied on a review of federal and state statutes, a news article search, biennium reports of the Commission, and information obtained from the…

  20. Operationally Efficient Propulsion System Study (OEPSS) data book. Executive summary

    NASA Technical Reports Server (NTRS)

    Wong, George S.

    1990-01-01

    The study was initiated to identify operations problems and cost drivers for current propulsion systems and to identify technology and design approaches to increase the operational efficiency and reduce operations costs for future propulsion systems. To provide readily usable data for the Advanced Launch System (ALS) program, the results of the Operationally Efficient Propulsion System Study (OEPSS) were organized into a series of OEPSS Data Books as follows: Volume 1, Generic Ground Operations Data; Volume 2, Ground Operations Problems; Volume 3, Operations Technology; Volume 4, OEPSS Design Concepts; and Volume 5, OEPSS Final Review Briefing, which summarizes the activities and results of the study. Summarized here are the salient results of the first year. A synopsis of each volume listed above is presented.

  1. Modern midwifery: two case studies.

    PubMed

    Anderson, S

    1985-01-01

    To gain more understanding of the practices of modern midwives, 2 births occurring in a Botswanan District Hospital Maternity Ward were observed by a research assistant. Naturalistic observation was considered more reliable than interviews with either patients or modern midwives to assess the biosocial aspects of birth in the modern sector. At admission to the labor room, these 2 midwives checked the patient's blood pressure, performed a vaginal examination, checked the fetal heart, palpated the uterus, shaved the public hair, and administered an enema. Both midwives did not communicate with their patients during these procedures or offer information on the results. The patients were told not to push; 1 midwife commented, "In the hospital, nobody delivers by herself." Rather, patients were instructed to do their "breathing exercises," a term with which they were not familiar and was not explained. In the 1st case, an episiotomy was performed. Both births were uneventful in terms of complications, but marked by a lack of attention to the psychological needs of the patient or sufficient explanations as to the progress of the delivery. Overall, all communications between the modern midwives observed and their patients were impersonal, with an emphasis on technical procedures. PMID:12282440

  2. Theoretical pluralism in psychoanalytic case studies

    PubMed Central

    Willemsen, Jochem; Cornelis, Shana; Geerardyn, Filip M.; Desmet, Mattias; Meganck, Reitske; Inslegers, Ruth; Cauwe, Joachim M. B. D.

    2015-01-01

    The aim of this study is to provide an overview of the scientific activity of different psychoanalytic schools of thought in terms of the content and production of case studies published on ISI Web of Knowledge. Between March 2013 and November 2013, we contacted all case study authors included in the online archive of psychoanalytic and psychodynamic case studies (www.singlecasearchive.com) to inquire about their psychoanalytic orientation during their work with the patient. The response rate for this study was 45%. It appears that the two oldest psychoanalytic schools, Object-relations psychoanalysis and Ego psychology or “Classical psychoanalysis” dominate the literature of published case studies. However, most authors stated that they feel attached to two or more psychoanalytic schools of thought. This confirms that the theoretical pluralism in psychoanalysis stretches to the field of single case studies. The single case studies of each psychoanalytic school are described separately in terms of methodology, patient, therapist, or treatment features. We conclude that published case studies features are fairly similar across different psychoanalytic schools. The results of this study are not representative of all psychoanalytic schools, as some do not publish their work in ISI ranked journals. PMID:26483725

  3. Operationally Efficient Propulsion System Study (OEPSS) data book. Volume 2: Ground operations problems

    NASA Technical Reports Server (NTRS)

    Waldrop, Glen S.

    1990-01-01

    Operations problems and cost drivers were identified for current propulsion systems and design and technology approaches were identified to increase the operational efficiency and to reduce operations costs for future propulsion systems. To provide readily usable data for the ALS program, the results of the OEPSS study were organized into a series of OEPSS Data Books. This volume presents a detailed description of 25 major problems encountered during launch processing of current expendable and reusable launch vehicles. A concise description of each problem and its operational impact on launch processing is presented, along with potential solutions and technology recommendation.

  4. Surfactant studies for bench-scale operation

    NASA Technical Reports Server (NTRS)

    Hickey, Gregory S.; Sharma, Pramod K.

    1992-01-01

    A phase 2 study was initiated to investigate surfactant-assisted coal liquefaction, with the objective of quantifying the enhancement in liquid yields and product quality. This publication covers the first quarter of work. The major accomplishments were: the refurbishment of the high-pressure, high-temperature reactor autoclave, the completion of four coal liquefaction runs with Pittsburgh #8 coal, two each with and without sodium lignosulfonate surfactant, and the development of an analysis scheme for the product liquid filtrate and filter cake. Initial results at low reactor temperatures show that the addition of the surfactant produces an improvement in conversion yields and an increase in lighter boiling point fractions for the filtrate.

  5. Surfactant studies for bench-scale operation

    NASA Technical Reports Server (NTRS)

    Hickey, Gregory S.; Sharma, Pramod K.

    1993-01-01

    A phase 2 study has been initiated to investigate surfactant-assisted coal liquefaction, with the objective of quantifying the enhancement in liquid yields and product quality. This report covers the second quarter of work. The major accomplishments were: completion of coal liquefaction autoclave reactor runs with Illinois number 6 coal at processing temperatures of 300, 325, and 350 C, and pressures of 1800 psig; analysis of the filter cake and the filtrate obtained from the treated slurry in each run; and correlation of the coal conversions and the liquid yield quality to the surfactant concentration. An increase in coal conversions and upgrading of the liquid product quality due to surfactant addition was observed for all runs.

  6. Get Them Talking: Managing Change through Case Studies and Case Study Discussion. RUSA Occasional Paper, Number 25.

    ERIC Educational Resources Information Center

    Arthur, Gwen, Ed.

    Since 1989, the Reference and User Services Association/Management and Operation of User Services Section's Management of Reference Committee has successfully used case studies to foster structured discussions among public service librarians on a wide variety of issues relating to managing change in reference services. The information offered in…

  7. Operationally Efficient Propulsion System Study (OEPSS) data book. Volume 1: Generic ground operations data

    NASA Technical Reports Server (NTRS)

    Byrd, Raymond J.

    1990-01-01

    This study was initiated to identify operations problems and cost drivers for current propulsion systems and to identify technology and design approaches to increase the operational efficiency and reduce operations costs for future propulsion systems. To provide readily usable data for the Advance Launch System (ALS) program, the results of the Operationally Efficient Propulsion System Study (OEPSS) were organized into a series of OEPSS Data Books as follows: Volume 1, Generic Ground Operations Data; Volume 2, Ground Operations Problems; Volume 3, Operations Technology; Volume 4, OEPSS Design Concepts; and Volume 5, OEPSS Final Review Briefing, which summarizes the activities and results of the study. This volume presents ground processing data for a generic LOX/LH2 booster and core propulsion system based on current STS experience. The data presented includes: top logic diagram, process flow, activities bar-chart, loaded timelines, manpower requirements in terms of duration, headcount and skill mix per operations and maintenance instruction (OMI), and critical path tasks and durations.

  8. Cholecystitis: the Ethiopian experience, a report of 712 operated cases from one of the referral hospitals.

    PubMed

    Bekele, Zenebe; Tegegn, Kassahun

    2002-07-01

    This is a prospective study conducted from September 1991 to September 2000. Seven-hundred and twelve patients operated for acute and chronic cholecystitis were studied. The male to female ratios for elective and emergency admissions were 1:5 and 1:2.4, respectively. The mean age was 42.7 years. Acute cholecystitis accounted for 10.6% of the 712 cases. There were a total of 666 (93.5%) calculus and 46 (6.5%) acalculus cases. Empyema was seen in 77 (10.8%) patients and hydrops of the gallbladder in 35 (4.9%). Iatrogenic Common Bile Duct (CBD) injury was found to be more of a problem of the contracted gallbladder. In this study severe complications like gangrenous gallbladder, perforated gallbladder, suppurative cholangitis and subhepatic abscess were found more in males than in females. Calculus cholecystitis was found to be a common disease in Ethiopia, and that its features and prevalence as well as sex predilection compare well with reports from other areas. However the findings in this report were found to be different from the reports of the rest of the African Continent. PMID:12602244

  9. Case Studies in Literacy Development.

    ERIC Educational Resources Information Center

    Purvis, Don

    The report details results of a research project to monitor and map the literacy development of three learners of English as a Second Language (ESL) studying in an Australian English program for adult migrants. The objective was to gain a longitudinal picture of their reading and writing development over a period of nine months. Five additional…

  10. A Case Study of MEDCANGRO Relative to RAND Conceptual Framework.

    PubMed

    Scott, Alvin; Hogan, Richard

    2015-01-01

    The 2010 Department of Defense (DoD) Instruction 6000.16, Military Health Support for Stability Operations, established medical stability operations as a core military mission. National military leaders appreciated that to better manage risks for US military personnel operating in far forward locations, reduce cost and footprint requirements for operations, and aid partner nations with providing service to relevant populations in underserviced/undergoverned the US military would need to be employed strategically in efforts to build partner nation medical capacity. Medical Stability Operations has evolved into Global Health Engagement in the lexicon of planners but the goal is still the same. This article used a technical report authored by the RAND Corporation as the basis of a case study of a Special Operations Command Africa (SOCAF) Mission to the country of Niger to build a casualty evacuation capability. The case study evaluates the utility of a hypothetical framework developed by the RAND researchers relative to the actual events and outcomes of an actual mission. The principal finding is that the RAND technical report is of value to planners, Operators, and trainers as a systematic approach to successful building partner capacity in health (BPC-H) missions. The article also offers several examples of metrics that aid leadership in making better decisions as to when corrective actions might be required. PMID:26125176

  11. A Case Study of Engineering Ethics

    NASA Astrophysics Data System (ADS)

    Shimizu, Kazuo

    In Engineering Ethics Class at Shizuoka University, the Code of Ethics and Cases for Electrical Engineers by IEEJ Ethics committee is used to promote for high education effect to correspond large number of students (140students). In this paper, a case study in the class, and survey results for ethics value of students are presented. In addition, some comments for role playing act on the case of virtual experiences by students are described.

  12. Labyrinthine sequestrum: four case studies.

    PubMed

    Lao, Zheng; Sha, Yan; Chen, Bing; Dai, Chun-Fu; Huang, Wen-Hu; Cheng, Yu-Shu

    2012-09-01

    Labyrinthine sequestrum, a rare form of labyrinthitis, is highly distinct from the more commonly encountered labyrinthitis ossificans based on its unique clinical, radiologic, and histologic characteristics. The study included 4 such patients who had undergone clinical and laboratory investigations, computed tomography (CT), and magnetic resonance imaging (MRI) assessments followed by surgical procedures and pathological evaluation. Their major symptoms were otorrhea, otalgia, tinnitus, and profound hearing loss. Imaging studies showed an osteolytic soft mass with calcified debris in the inner ear, and the bony labyrinth was eroded partly or completely by granulation mass, with loss of bony morphology. Further pathological examination was coincident with inflammatory granulation tissue with some calcification or osseous tissue. The disease process is attributed to chronic osteomyelitis due to the presence of osteonecrosis. Prompt CT and MRI examinations and optimal therapeutic management facilitate definitive diagnosis and protect against fatal complications. PMID:22467283

  13. Shuttle Ground Operations Efficiencies/Technologies (SGOE/T) study. Volume 2: Ground Operations evaluation

    NASA Technical Reports Server (NTRS)

    Scholz, A. L.; Hart, M. T.; Lowry, D. J.

    1987-01-01

    The Ground Operations Evaluation describes the breath and depth of the various study elements selected as a result of an operational analysis conducted during the early part of the study. Analysis techniques used for the evaluation are described in detail. Elements selected for further evaluation are identified; the results of the analysis documented; and a follow-on course of action recommended. The background and rationale for developing recommendations for the current Shuttle or for future programs is presented.

  14. Brick handling: a case study.

    PubMed

    Webb, R D; Handyside, J

    1982-09-01

    A small change in brick dimensions resulted in an increase in the perceived work-load of men loading and unloading pallets of bricks by hand. A laboratory study indicated that the change in brick dimensions required changes in grip pattern in order to unload bricks at the same rate, moving the same number at a time. These changed grip patterns resulted in increased upper body movement, increased chest-muscle activity and higher heart rates. These differences were reflected in higher subjective ratings of fatigue. PMID:15676442

  15. Lathe Operator. Coordinator's Guide. Individualized Study Guide. General Metal Trades.

    ERIC Educational Resources Information Center

    East Texas State Univ., Commerce. Occupational Curriculum Lab.

    This guide provides information to enable coordinators to direct learning activities for students using an individualized study guide on operating a lathe. The study material is designed for students enrolled in cooperative part-time training and employed, or desiring to be employed, as lathe operators. Contents include a sample progress chart,…

  16. A study of the operation of selected national research facilities

    NASA Technical Reports Server (NTRS)

    Eisner, M.

    1974-01-01

    The operation of national research facilities was studied. Conclusions of the study show that a strong resident scientific staff is required for successful facility operation. No unique scheme of scientific management is revealed except for the obvious fact that the management must be responsive to the users needs and requirements. Users groups provide a convenient channel through which these needs and requirements are communicated.

  17. Case Studies on Educational Administration. Third Edition.

    ERIC Educational Resources Information Center

    Kowalski, Theodore J.

    This book contains 24 case studies selected to demonstrate the different types of challenges in contemporary educational leadership. It is intended to help prospective administrators develop decision-making skills. The cases are quite complex with multiple viewpoints and aspects. They represent a range of problems encountered by practitioners in…

  18. Case Studies of Environmental Risks to Children.

    ERIC Educational Resources Information Center

    Goldman, Lynn R.

    1995-01-01

    Presents case studies on children's exposure to pesticides, including risks through the use of the insecticide aldicarb on bananas, the home use of diazinon, and the use of interior house paint containing mercury. These cases illustrate how regulatory agencies, parents, health-care providers, and others who come into contact with children have…

  19. Case Studies in Elementary and Secondary Curriculum

    ERIC Educational Resources Information Center

    Boboc, Marius; Nordgren, R. D.

    2010-01-01

    Practical and engaging, this book contains 21 case studies that help students apply curriculum theory to classroom reality. Each case is authored by an in-service teacher, reflecting on ways to improve instruction by making changes to various aspects of the curriculum. These real-life examples investigate up-to-date curricular issues ranging from…

  20. Abbreviated Case Studies in Organizational Communication

    ERIC Educational Resources Information Center

    Wanguri, Deloris McGee

    2005-01-01

    The cases contained within organizational communication texts are generally two to three pages, often followed by questions. These case studies are certainly useful. They generally describe events in the present, provide some type of organizational context, include first-hand data, include a record of what people say and think, develop a…

  1. Case Study Report #8. Lisa Williams.

    ERIC Educational Resources Information Center

    Myers, Douglas D.; And Others

    This document presents one in a series of twenty-three case studies derived from in-depth interviews using a sampling of former participants in the Mountain-Plains program, a residential, family-based education program developed to improve the economic potential and lifestyle of selected student families in a six-state area. Each case study…

  2. Pontiac fever: an operational definition for epidemiological studies

    PubMed Central

    Tossa, Paul; Deloge-Abarkan, Magali; Zmirou-Navier, Denis; Hartemann, Philippe; Mathieu, Laurence

    2006-01-01

    Background Pontiac fever is usually described in epidemic settings. Detection of Pontiac fever is a marker of an environmental contamination by Legionella and should thereby call for prevention measures in order to prevent outbreak of Legionnaire's disease. The objective of this study is to propose an operational definition of Pontiac fever that is amenable to epidemiological surveillance and investigation in a non epidemic setting. Methods A population of 560 elderly subjects residing in 25 nursing homes was followed during 4 months in order to assess the daily incidence of symptoms associated, in the literature, with Pontiac fever. The water and aerosol of one to 8 showers by nursing home were characterized combining conventional bacterial culture of Legionella and the Fluorescence In Situ Hybridization (FISH) technique that used oligonucleotides probes specific for Legionellaceae. A definition of Pontiac fever was devised based on clinical symptoms described in epidemic investigations and on their timing after the exposure event. The association between incidence of Pontiac fever and shower contamination levels was evaluated to test the relevance of this definition. Results The proposed definition of Pontiac fever associated the following criteria: occurrence of at least one symptom among headache, myalgia, fever and shivers, possibly associated with other 'minor' symptoms, within three days after a shower contaminated by Legionella, during a maximum of 8 days (minimum 2 days). 23 such cases occurred during the study (incidence rate: 0.125 cases per person-year [95% CI: 0.122–0.127]). A concentration of Legionella in water equal to or greater than 104.L-1 (FISH method) was associated with a significant increase of incidence of Pontiac fever (p = 0.04). Conclusion Once validated in other settings, the proposed definition of Pontiac fever might be used to develop epidemiological surveillance and help draw attention on sources of Legionella. PMID:16646972

  3. A Singapore Case of Lesson Study

    ERIC Educational Resources Information Center

    Cheng, Lu Pien; Yee, Lee Peng

    2012-01-01

    In this article, we present a case study of six Singaporean elementary school teachers working in a Lesson Study team that prepared them for problem solving instruction. The Lesson Study process included preparing, observing, and critiquing mathematics lessons in the context of solving fractions tasks. By conducting Lesson Study, we anticipated…

  4. BTS Case Study: The Galloway Family Home

    SciTech Connect

    Brandegee Group

    1999-03-08

    Case study of an energy-efficient Habitat for Humanity house that uses 30% less energy than conventional residential construction. The project was part of the Jimmy Carter Work Project in rural Appalachia in 1997.

  5. Operational tolerance after liver transplantation, more common than we think: a case report.

    PubMed

    Benítez, Carlos; Arancibia, Juan Pablo; Arrese, Marco; Soza, Alejandro; Domínguez, Pilar; Jarufe, Nicolás; Martínez, Jorge; Pérez-Ayuso, Rosa María

    2011-01-01

    Operational tolerance after liver transplantation has been described in around 20% of the recipients. These patients are able to maintain a normal graft function in the absence of immunosuppressive drugs, thus being free of adverse effects that are common and frequently severe. Here we present a well-documented case of operational tolerance after liver transplantation and discuss current concepts on this topic with emphasis on recent findings that will potentially allow for identifying graft-tolerant patients. PMID:21677341

  6. Operations and Costs; A Study of Educational Public Television Stations.

    ERIC Educational Resources Information Center

    Anderson, James A.

    Good programing in public television requires adequate funding; adequate funding requires an understanding of the total public television station picture. This study provides information concerning projected operating characteristics and the resultant costs of these operations for public broadcasting stations. After a discussion of the procedures…

  7. Operation of Wastewater Treatment Plants: A Home Study Training Program.

    ERIC Educational Resources Information Center

    California State Univ., Sacramento. Dept. of Civil Engineering.

    This manual was prepared by experienced wastewater treatment plant operators to provide a home study course to develop new qualified workers and expand the abilities of existing workers. The objective of this manual is to provide the knowledge and skills necessary for certification. Participants learn the basic operational aspects of treatment…

  8. Training Program for Operation of Emergency Vehicles. Trainee Study Guide.

    ERIC Educational Resources Information Center

    INNOVATRIX, Inc., Ingomar, PA.

    A two-part trainee study guide for use in the classroom phase of the Emergency Vehicle Operation (EVO) training program is provided. Part 1, to be taken by all trainees, contains seven units organized into various subunits and includes the following: (1) introduction to the course; (2) some legal aspects of emergency vehicle operation (state…

  9. 38th Annual Maintenance & Operations Cost Study for Colleges

    ERIC Educational Resources Information Center

    Agron, Joe

    2009-01-01

    The nation's colleges are feeling the pinch of the economic downturn, and maintenance and operations (M&O) budgets especially are under pressure. This article presents data from the 38th annual Maintenance & Operations Cost Study for colleges that can help one in benchmarking expenditures at one's institution. Data provided only targets two-year…

  10. 36th Annual Maintenance & Operations Cost Study: Schools

    ERIC Educational Resources Information Center

    Agron, Joe

    2007-01-01

    Spending by school districts on maintenance and operations increased in 2006-2007, reversing years of historic low expenditures. According to "American School & University's" 36th annual Maintenance and Operations (M&O) Cost Study, the median school district spends 9.19% of total district expenditures (TDE) on M&O, up from 7.58% the year before.…

  11. 38th Annual Maintenance & Operations Cost Study for Schools

    ERIC Educational Resources Information Center

    Agron, Joe

    2009-01-01

    Despite the worst economic environment in generations, spending by K-12 institutions on maintenance and operations (M&O) held its own--defying historical trends that have shown M&O spending among the most affected in times of budget tightening. This article presents data from the 38th annual Maintenance & Operations Cost Study for schools that can…

  12. Operations: A Comparative Study of the United States and Taiwan

    ERIC Educational Resources Information Center

    Lin, Cheng-Yao; Becker, Jerry; Byun, Mi-Ran; Yang, Der-Ching; Huang, Tsai-Wei

    2013-01-01

    This study examined (a) the differences in preservice teachers’ procedural knowledge in four areas of fraction operations in Taiwan and the United States, (b) the differences in preservice teachers’ conceptual knowledge in four areas of fraction operations in Taiwan and the United States, and (c) correlation in preservice teachers’ conceptual…

  13. Space Operations Training Concepts Benchmark Study (Training in a Continuous Operations Environment)

    NASA Astrophysics Data System (ADS)

    Johnston, A. E.

    2002-01-01

    The NASA/USAF Benchmark Space Operations Training Concepts Study will perform a comparative analysis of the space operations training programs utilized by the United States Air Force Space Command with those utilized by the National Aeronautics and Space Administration. The concentration of the study will be focused on Ground Controller/Flight Controller Training for the International Space Station Payload Program. The duration of the study is expected to be five months with report completion by 30 June 2002. The U.S. Air Force Space Command was chosen as the most likely candidate for this benchmark study because their experience in payload operations controller training and user interfaces compares favorably with the Payload Operations Integration Center's training and user interfaces. These similarities can be seen in the dynamics of missions/payloads, controller on-console requirements, and currency/ proficiency challenges to name a few. It is expected that the report will look at the respective programs and investigate goals of each training program, unique training challenges posed by space operations ground controller environments, processes of setting up controller training programs, phases of controller training, methods of controller training, techniques to evaluate adequacy of controller knowledge and the training received, and approaches to training administration. The report will provide recommendations to the respective agencies based on the findings. Following selection of participants and an approval to proceed, initial contact will be made with U.S. Air Force Space Command Directorate of Training to discuss steps to accomplish the study.

  14. A Case Study about Communication Strategies

    ERIC Educational Resources Information Center

    Lin, Grace Hui Chin

    2011-01-01

    The primary purpose of this case study was to identify what were Taiwanese University English as a Foreign Language (EFL) learners' perceptions about learning communication strategies. This study collected qualitative data about students' beliefs and attitudes as they learned communication strategies. The research question guiding the study was:…

  15. Education and Work Councils: Four Case Studies.

    ERIC Educational Resources Information Center

    Prager, Audrey; And Others

    This collection of four case studies represents the conclusion of a two-phase study of a federal program to sponsor education and work councils. Following an outline of the history and concept of education and work councils as well as the findings of a study of such councils, the importance of council collaboration with selected sectors is…

  16. Predicting Students Drop Out: A Case Study

    ERIC Educational Resources Information Center

    Dekker, Gerben W.; Pechenizkiy, Mykola; Vleeshouwers, Jan M.

    2009-01-01

    The monitoring and support of university freshmen is considered very important at many educational institutions. In this paper we describe the results of the educational data mining case study aimed at predicting the Electrical Engineering (EE) students drop out after the first semester of their studies or even before they enter the study program…

  17. Validating an artificial intelligence human proximity operations system with test cases

    NASA Astrophysics Data System (ADS)

    Huber, Justin; Straub, Jeremy

    2013-05-01

    An artificial intelligence-controlled robot (AICR) operating in close proximity to humans poses risk to these humans. Validating the performance of an AICR is an ill posed problem, due to the complexity introduced by the erratic (noncomputer) actors. In order to prove the AICR's usefulness, test cases must be generated to simulate the actions of these actors. This paper discusses AICR's performance validation in the context of a common human activity, moving through a crowded corridor, using test cases created by an AI use case producer. This test is a two-dimensional simplification relevant to autonomous UAV navigation in the national airspace.

  18. Visual evoked potentials monitoring in a case of transient post-operative visual loss.

    PubMed

    Capon, Marie; Boven, Michel Van; van Pesch, Vincent; Hantson, Philippe

    2016-08-01

    Post-operative visual loss (POVL) is a rare, albeit potentially serious complication of general anaesthesia. This report describes the case of a 54-year-old woman who developed transient POVL after general anaesthesia following a left posterior parietal meningioma surgery in the prone position and discusses the usefulness of visual evoked potentials monitoring in such situations. PMID:27601743

  19. Visual evoked potentials monitoring in a case of transient post-operative visual loss

    PubMed Central

    Capon, Marie; Boven, Michel Van; van Pesch, Vincent; Hantson, Philippe

    2016-01-01

    Post-operative visual loss (POVL) is a rare, albeit potentially serious complication of general anaesthesia. This report describes the case of a 54-year-old woman who developed transient POVL after general anaesthesia following a left posterior parietal meningioma surgery in the prone position and discusses the usefulness of visual evoked potentials monitoring in such situations. PMID:27601743

  20. Case Report of an Anthrax Presentation Relevant to Special Operations Medicine.

    PubMed

    Winkler, Stephen; Enzenauer, Robert W; Karesh, James W; Pasteur, Nshimyimana; Eisnor, Derek L; Painter, Rex B; Calvano, Christopher J

    2016-01-01

    Special Operations Forces (SOF) medical personnel function worldwide in environments where endemic anthrax (caused by Bacillus anthracis infection) may present in one of three forms: cutaneous, pulmonary, or gastrointestinal. This report presents a rare periocular anthrax case from Haiti to emphasize the need for heightened diagnostic suspicion of unusual lesions likely to be encountered in SOF theaters. PMID:27450596

  1. Gigantic Suprapubic Lymphedema: A Case Study

    PubMed Central

    Tanhaeivash, Roozbeh; Franiel, Tobias; Grimm, Marc-Oliver

    2016-01-01

    We present the first case study of idiopathic gigantic suprapubic lymphedema and buried penis treated with puboscrotal reconstruction in a patient with initial extreme obesity after an extensive weight reduction (120 kg). Massive localized lymphedema of the suprapubic region should be differentiated from the scrotal type. Severe lymphedema could not resolve on its own and weight reduction does not seem to be helpful in such cases. PMID:27574599

  2. Gigantic Suprapubic Lymphedema: A Case Study.

    PubMed

    Tanhaeivash, Roozbeh; Franiel, Tobias; Grimm, Marc-Oliver; Horstmann, Marcus

    2016-08-01

    We present the first case study of idiopathic gigantic suprapubic lymphedema and buried penis treated with puboscrotal reconstruction in a patient with initial extreme obesity after an extensive weight reduction (120 kg). Massive localized lymphedema of the suprapubic region should be differentiated from the scrotal type. Severe lymphedema could not resolve on its own and weight reduction does not seem to be helpful in such cases. PMID:27574599

  3. Nuclear forensic investigations: two case studies.

    PubMed

    Wallenius, M; Mayer, K; Ray, I

    2006-01-01

    This paper describes the methodology and analytical methods used in nuclear forensic investigations. Two case studies are taken as examples to illustrate this. These examples represent typical cases that have been analysed at the Institute for Transuranium Elements (ITU) since last 10 years, i.e. the beginning of the illicit trafficking of nuclear materials. Results of the various analytical techniques are shown, which, together with other type of information, reveal the origin of the material. PMID:16410154

  4. Retrospective studies of operating problems in air transport

    NASA Technical Reports Server (NTRS)

    Billings, C. E.; Lauber, J. K.; Cooper, G. E.; Ruffell-Smith, H. P.

    1976-01-01

    An epidemiological model for the study of human errors in aviation is presented. In this approach, retrospective data are used as the basis for formulation of hypotheses as to system factors which may have contributed to such errors. Prospective experimental studies of aviation operations are also required in order to prove or disprove the hypotheses, and to evaluate the effectiveness of intervention techniques designed to solve operational problems in the aviation system.

  5. 26 CFR 1.614-3 - Rules relating to separate operating mineral interests in the case of mines.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 26 Internal Revenue 7 2010-04-01 2010-04-01 true Rules relating to separate operating mineral....614-3 Rules relating to separate operating mineral interests in the case of mines. (a) Election to aggregate separate operating mineral interests—(1) General rule. Except in the case of oil and gas wells,...

  6. Social Studies Project Evaluation: Case Study and Recommendations.

    ERIC Educational Resources Information Center

    Napier, John

    1982-01-01

    Describes the development and application of a model for social studies program evaluations. A case study showing how the model's three-step process was used to evaluate the Improving Citizenship Education Project in Fulton County, Georgia is included. (AM)

  7. Technologies in Literacy Learning: A Case Study

    ERIC Educational Resources Information Center

    Cloonan, Anne

    2010-01-01

    This article draws on outcomes of a study which explored changes in teachers' literacy pedagogies as a result of their participation in a collaborative teacher professional learning project. The educational usability of schemas drawn from multiliteracies and Learning by Design theory is illustrated through a case study of a teacher's work on…

  8. Collaborative Assessment: Middle School Case Study

    ERIC Educational Resources Information Center

    Parkison, Paul T.

    2014-01-01

    Utilizing a participant observer research model, a case study of the efficacy of a collaborative assessment methodology within a middle school social studies class was conducted. A review of existing research revealed that students' perceptions of assessment, evaluation, and accountability influence their intrinsic motivation to learn. A…

  9. Case Studies of the Migrant Education Program.

    ERIC Educational Resources Information Center

    Marks, Ellen L.

    Intended for federal policymakers, this study examined four aspects of the Chapter 1 migrant education program: program administration, program services, students served, and program expenditures. Case studies were conducted in California, Florida, Illinois, Massachusetts, Oregon, and Texas between November 1986 and March 1987. State agencies and…

  10. Case Studies in Australian Adult Education.

    ERIC Educational Resources Information Center

    Clark, Ralph J., Ed.; Rooth, S. John, Ed.

    This publication contains the following 24 case studies of adult education in Australia: "NSW Department of Agriculture Home Study Programme" (O'Neill); "Self-Help Adult Education: The University of the Third Age at the Brisbane CAE" (Swindell); "Marriage Enrichment Programme" (D. Kerr, C. Kerr); "Carringbush Library: A Place to Be" (Letcher);…

  11. A Multiple Case Study of Innovation

    ERIC Educational Resources Information Center

    Zheng, Wei; Khoury, Anne E.

    2008-01-01

    This study aims to explore how leadership and contextual factors influence innovation in R&D teams in national laboratories, using the approach of multiple case studies. This paper provides some preliminary findings from two highly innovative teams residing in two national laboratories in the US. The preliminary results suggested several common…

  12. Connecting Reading and Writing: A Case Study

    ERIC Educational Resources Information Center

    Li, Zhanfang

    2015-01-01

    Connecting reading and writing, proposed by many scholars, is realized in this case study. The 30 participants in this study are the English majors of the third year in one School of Foreign Languages in Beijing. They are encouraged to write journals every week, based on the source text materials in their Intensive Reading class, with the final…

  13. Anthropology and Popular Culture: A Case Study.

    ERIC Educational Resources Information Center

    Estes, Jack

    The study of popular culture in the United States is an appropriate anthropological endeavor, as evidenced in a case study of the volcanic eruption of Mt. St. Helens in Oregon. By examining its popular arts, anthropologists gain understanding of the culture and its people. For example, an analysis of reactions to the Mt. St. Helens eruption…

  14. CASE STUDY: DIELDRIN ATTACK IN DALYAN LAGOON

    EPA Science Inventory

    During the first two weeks of December 2005, NATO sponsored an Advanced Study Institute (ASI) in Istanbul, Turkey. Part of this ASI involved a case study of a terrorist attack, where a chemical was assumed to be dumped into Sulunger Lake in Turkey. This chapter documents the re...

  15. Case Studies of Three Interorganizational Arrangements.

    ERIC Educational Resources Information Center

    Yin, Robert K.; And Others

    As part of their study of interorganizational collaboration, researchers present three detailed case studies of how regional education agencies (REAs) supply knowledge utilization services to the school districts they serve. The three REAs are the Wayne County (Michigan) Intermediate School District (with 36 districts), the Educational Improvement…

  16. Intent inferencing by an intelligent operator's associate - A validation study

    NASA Technical Reports Server (NTRS)

    Jones, Patricia M.

    1988-01-01

    In the supervisory control of a complex, dynamic system, one potential form of aiding for the human operator is a computer-based operator's associate. The design philosophy of the operator's associate is that of 'amplifying' rather than automating human skills. In particular, the associate possesses understanding and control properties. Understanding allows it to infer operator intentions and thus form the basis for context-dependent advice and reminders; control properties allow the human operator to dynamically delegate individual tasks or subfunctions to the associate. This paper focuses on the design, implementation, and validation of the intent inferencing function. Two validation studies are described which empirically demonstrate the viability of the proposed approach to intent inferencing.

  17. Integrating ethics into case study assignments.

    PubMed

    Marshall, Pamela A

    2014-12-01

    I teach an upper-level writing course, Genes, Race, Gender, and Society, designed for Life Science majors, in which I utilize a case study to expose students to ethical ways of thinking. Students first work through the topical case study and then are challenged to rethink their responses through the lenses of ethics, taking into account different ethical frameworks. Students then develop their own case study, integrating ethical components. I want to expose my students to this way of thinking because I see technology being driven by the Jurassic Park phenomenon, "Your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should," and want future physicians grounded in a sense of how their actions relate to the greater good. PMID:25574287

  18. Shuttle Case Study Collection Website Development

    NASA Technical Reports Server (NTRS)

    Ransom, Khadijah S.; Johnson, Grace K.

    2012-01-01

    As a continuation from summer 2012, the Shuttle Case Study Collection has been developed using lessons learned documented by NASA engineers, analysts, and contractors. Decades of information related to processing and launching the Space Shuttle is gathered into a single database to provide educators with an alternative means to teach real-world engineering processes. The goal is to provide additional engineering materials that enhance critical thinking, decision making, and problem solving skills. During this second phase of the project, the Shuttle Case Study Collection website was developed. Extensive HTML coding to link downloadable documents, videos, and images was required, as was training to learn NASA's Content Management System (CMS) for website design. As the final stage of the collection development, the website is designed to allow for distribution of information to the public as well as for case study report submissions from other educators online.

  19. Space Operations Training Concepts Benchmark Study (Training in a Continuous Operations Environment)

    NASA Technical Reports Server (NTRS)

    Johnston, Alan E.; Gilchrist, Michael; Underwood, Debrah (Technical Monitor)

    2002-01-01

    The NASA/USAF Benchmark Space Operations Training Concepts Study will perform a comparative analysis of the space operations training programs utilized by the United States Air Force Space Command with those utilized by the National Aeronautics and Space Administration. The concentration of the study will be focused on Ground Controller/Flight Controller Training for the International Space Station Payload Program. The duration of the study is expected to be five months with report completion by 30 June 2002. The U.S. Air Force Space Command was chosen as the most likely candidate for this benchmark study because their experience in payload operations controller training and user interfaces compares favorably with the Payload Operations Integration Center's training and user interfaces. These similarities can be seen in the dynamics of missions/payloads, controller on-console requirements, and currency/proficiency challenges to name a few. It is expected that the report will look at the respective programs and investigate goals of each training program, unique training challenges posed by space operations ground controller environments, processes of setting up controller training programs, phases of controller training, methods of controller training, techniques to evaluate adequacy of controller knowledge and the training received, and approaches to training administration. The report will provide recommendations to the respective agencies based on the findings. Attached is a preliminary outline of the study. Following selection of participants and an approval to proceed, initial contact will be made with U.S. Air Force Space Command Directorate of Training to discuss steps to accomplish the study.

  20. NHEXAS PHASE I MARYLAND STUDY--STANDARD OPERATING PROCEDURE FOR BALANCE OPERATION (L04)

    EPA Science Inventory

    The purpose of this SOP is to describe the balance operation for the NHEXAS study. For the analysis of NHEXAS samples at Harvard School of Public Health/Emory University, many standards and standard solutions are based upon obtaining an accurate weight of a standard reagent, a p...

  1. The Science Manager's Guide to Case Studies

    SciTech Connect

    Branch, Kristi M.; Peffers, Melissa S.; Ruegg, Rosalie T.; Vallario, Robert W.

    2001-09-24

    This guide takes the science manager through the steps of planning, implementing, validating, communicating, and using case studies. It outlines the major methods of analysis, describing their relative merits and applicability while providing relevant examples and sources of additional information. Well-designed case studies can provide a combination of rich qualitative and quantitative information, offering valuable insights into the nature, outputs, and longer-term impacts of the research. An objective, systematic, and credible approach to the evaluation of U.S. Department of Energy Office of Science programs adds value to the research process and is the subject of this guide.

  2. [Familial hypobetalipoproteinemia. Familial study of 4 cases].

    PubMed

    Gay, G; Pessah, M; Bouma, M E; Roche, J F; Aymard, J P; Beucler, I; Aggerbeck, L P; Infante, R

    1990-01-01

    A familial study of four cases with hypobetalipoproteinemia is reported. Three members are heterozygous and one is homozygous. This congenital fat malabsorption in homozygous state is commonly associated with an absence of serum apoprotein B and LDL. Neuromuscular and ophthalmological signs are absent in this case. The major role of upper digestive endoscopy in the diagnostic procedure is emphasized. Histochemical and immunoenzymatic stains of enterocytes and intestinal organ culture show defective synthesis apo B in the homozygous patient. Studies of DNA polymorphism in the homozygous patient have shown that the apo B gene doesn't certain major insertions or deletions. These results are discussed. PMID:2096430

  3. Operations

    ERIC Educational Resources Information Center

    Wilkins, Jesse L. M.; Norton, Anderson; Boyce, Steven J.

    2013-01-01

    Previous research has documented schemes and operations that undergird students' understanding of fractions. This prior research was based, in large part, on small-group teaching experiments. However, written assessments are needed in order for teachers and researchers to assess students' ways of operating on a whole-class scale. In this…

  4. Reservoirs performances under climate variability: a case study

    NASA Astrophysics Data System (ADS)

    Longobardi, A.; Mautone, M.; de Luca, C.

    2014-09-01

    A case study, the Piano della Rocca dam (southern Italy) is discussed here in order to quantify the system performances under climate variability conditions. Different climate scenarios have been stochastically generated according to the tendencies in precipitation and air temperature observed during recent decades for the studied area. Climate variables have then been filtered through an ARMA model to generate, at the monthly scale, time series of reservoir inflow volumes. Controlled release has been computed considering the reservoir is operated following the standard linear operating policy (SLOP) and reservoir performances have been assessed through the calculation of reliability, resilience and vulnerability indices (Hashimoto et al. 1982), comparing current and future scenarios of climate variability. The proposed approach can be suggested as a valuable tool to mitigate the effects of moderate to severe and persistent droughts periods, through the allocation of new water resources or the planning of appropriate operational rules.

  5. Operationally Efficient Propulsion System Study (OEPSS): OEPSS Video Script

    NASA Technical Reports Server (NTRS)

    Wong, George S.; Waldrop, Glen S.; Trent, Donnie (Editor)

    1992-01-01

    The OEPSS video film, along with the OEPSS Databooks, provides a data base of current launch experience that will be useful for design of future expendable and reusable launch systems. The focus is on the launch processing of propulsion systems. A brief 15-minute overview of the OEPSS study results is found at the beginning of the film. The remainder of the film discusses in more detail: current ground operations at the Kennedy Space Center; typical operations issues and problems; critical operations technologies; and efficiency of booster and space propulsion systems. The impact of system architecture on the launch site and its facility infrastucture is emphasized. Finally, a particularly valuable analytical tool, developed during the OEPSS study, that will provide for the "first time" a quantitative measure of operations efficiency for a propulsion system is described.

  6. Study to determine operational and performance criteria for STOL aircraft operating in low visibility conditions

    NASA Technical Reports Server (NTRS)

    Gorham, J. A.

    1978-01-01

    The operational and performance criteria for civil CTOL passenger-carrying airplanes landing in low visibilities depend upon the characteristics of the airplane, the nature and use of the ground and airborne guidance and control systems, and the geometry and lighting of the landing field. Based upon these criteria, FAA advisory circulars, airplane and equipment design characteristics, and airline operational and maintenance procedures were formulated. The documents are selected, described, and discussed in relationship to the potential low weather minima operation of STOL aircraft. An attempt is made to identify fundamental differences between CTOL and STOL aircraft characteristics which could impact upon existing CTOL documentation. Further study and/or flight experiments are recommended.

  7. LHC Abort Gap Cleaning Studies During Luminosity Operation

    SciTech Connect

    Gianfelice-Wendt, E.; Bartmann, W.; Boccardi, A.; Bracco, C.; Bravin, E.; Goddard, B.; Hofle, W.; Jacquet, D.; Jeff, A.; Kain, V.; Meddahi, M.; /CERN

    2012-05-11

    The presence of significant intensities of un-bunched beam is a potentially serious issue in the LHC. Procedures using damper kickers for cleaning both the Abort Gap (AG) and the buckets targeted for injection, are currently in operation at flat bottom. Recent observations of relatively high population of the AG during physics runs brought up the need for AG cleaning during luminosity operation. In this paper the results of experimental studies performed in October 2011 are presented.

  8. On the theoretical study of an RF-SQUID operation taking into account the noise influence

    NASA Astrophysics Data System (ADS)

    Chesca, Boris

    1994-03-01

    A possibility of Markov process technique application, namely the Fokker-Planck-Kolmogorov equation, for description of the RF-SQUID operation on the volt-current characteristic plateau taking into account the noise influence, in the case when CRN is a small parameter and C and RN are capacitance and resistance of the Josephson contact, respectively, has been described. The theory developed here considers without any approximations the probabilistic processes taking place during the RF-SQUID operation given a maximum information about the behavior of such system. Moreover, it allows one to consider different noise sources and to study for each of them the influence on the operating regime.

  9. Case studies in organic contaminant hydrogeology

    NASA Astrophysics Data System (ADS)

    Baker, John A.

    1989-07-01

    The effective management of domestic solid waste and hazardous, toxic, and radioactive waste is a major problem in the area of environmental geology and water sciences over the world. This series of case studies of organic contaminants from both solid and hazardous waste disposal facilities provides examples of these problems. The facilities were investigated to determine risks and liabilities before acquisition, to determine the site hydrogeologic conditions for design of appropriate groundwater monitoring plans, and/or to determine the potential for groundwater contamination. The results of these studies and investigations by Waste Management Inc. (WMI) and its consultants have shown certain relationships in the distribution of organic pollutants to the different geologic and hydrogeologic charac teristics of each facility. In each of the case studies, all 129 priority pollutants were analyzed in private wells and/or monitoring wells at the request of regulatory agencies. The 31 volatile organic compounds (VOCs) of the priority pollutant list were the majority of the organic compounds detected and these data are evaluated in each case study. The case studies are on disposal facilities located in glacial tills, carbonaceous weathered clay soils, weathered shale, limestone bedrock, dolomite bedrock, and alluvial and sedimentary deposits. A brief discussion of groundwater quality impacts and remedial measures also is included.

  10. Case study examples using self-assessment.

    PubMed

    Garstecki, D; Hutton, C L; Nerbonne, M A; Newman, C W; Smoski, W J

    1990-10-01

    The following case studies demonstrate the application of self-assessment techniques. The selection of procedures reported here is not meant to imply necessarily that these procedures are more or less effective or more widely used than other available self-assessment tests, but rather to illustrate the various purposes for which self-assessment tools may be employed. Case 1 illustrates the contribution of data obtained from the Hearing Performance Inventory (Giolas, Owens, Lamb, & Shubert, 1979) in the management and counseling of a severely hearing impaired adult. Case 2 involves the use of the Hearing Problem Inventory developed by Hutton in Atlanta (HPI-A, Hutton, 1987). Application of the Self-Assessment of Communication (SAC) and Significant Other Assessment of Communication (SOAC) (Schow and Nerbonne, 1982) is shown in Case 3, whereas Case 4 demonstrates the usefulness of the Hearing Handicap Inventory for the Elderly (HHIE, Ventry and Weinstein, 1982). Both the SAC/SOAC and HHIE batteries involve problem cases associated with hearing aid fitting and assessment of benefit. The final illustration (Case 5) is a report on the Children's Auditory Processing Performance Scale (CHAPPS), a new questionnaire developed by Smoski, Brunt, and Tannahill/ISHA (1987) for assessing parent's judgment of children's listening abilities (Appendix). The versatility of self-assessment applications across a broad assortment of impairment levels, age groups, and clinical settings is demonstrated in these cases. Hopefully the reader will see more clearly the application and value of these and other non-audiometric techniques and will be motivated to increase the use of self-assessment tools in the individual work setting. PMID:2269415

  11. Case reports: response to a partial power failure in the operating room.

    PubMed

    Carpenter, Tammy; Robinson, Stephen T

    2010-06-01

    Failure of the power supply to the operating suites is a rare event. When it happens, it is critical that the care team responds in a way that optimizes patient safety. In the event we describe in this case report, only the emergency (red) power outlets failed. The anesthesia care team and other staff in the 8 affected rooms with anesthetized patients generally responded appropriately. The optimal response to these events is not necessarily intuitive. It is important to have advanced planning both within the immediate work area and beyond the operating room all the way into the hospital infrastructure. PMID:20008912

  12. The Importance of "Weltanschauung" in Operations Research: The Case of the School Busing Problem

    ERIC Educational Resources Information Center

    Stimson, David H.; Thompson, Ronald P.

    1975-01-01

    In studying the school busing problem, operations researchers and other social scientists proceed differently because of their different "Weltanschauungen," or world views. This article examines the utility of operations researchers' desegregation view in light of recent educational literature, with special emphasis on the role of "Weltanschauung"…

  13. Case Studies of Altruistic Persons: AERA Roundtable.

    ERIC Educational Resources Information Center

    Stephens, William N.

    This document presents information from a body of research called Lives of Service, a collection of case studies of 32 altruistic adults. It begins with a review of the research on altruism, service orientation, giving, helpfulness, social responsibility, and voluntarism. Research on altruism in psychology and in other disciplines is included,…

  14. Lifelong Learning in SMEs: A Case Study.

    ERIC Educational Resources Information Center

    Holden, Rick; Smith, Vikki; Devins, Dave

    2002-01-01

    Learning centers using information-communications technologies were established in three British industrial estates. A case study of one organization shows the center contributed to lifelong learning and enhanced information technology training and employee confidence. Transfer of training and productivity improvements were not as clear. (Contains…

  15. An Effective School: A Case Study.

    ERIC Educational Resources Information Center

    Poindexter, Candace

    An elementary school principal's successful attempts to improve her inner-city school are described in this case study, which includes a diagram representing her formula for better education. The principal, a charismatic, elderly woman, takes an aggressive role in improving the school environment and student nutrition, encouraging and monitoring…

  16. Interdisciplinary Student Teams Projects: A Case Study

    ERIC Educational Resources Information Center

    Kruck, S. E.; Teer, Faye P.

    2009-01-01

    In today's organizations team work has become an integral part of the day-to-day routine. For this reason, University professors are including group projects in many courses. In such group assessments, we advocate the use of interdisciplinary teams, where possible. As a case study, we report an interdisciplinary group technical project with…

  17. A Case Study of Online Collaborative Learning

    ERIC Educational Resources Information Center

    Thompson, Ling; Ku, Heng-Yu

    2006-01-01

    This case study investigated 12 graduate students' online collaborative experiences and attitudes in an instructional design course. The instructor divided students into 4 groups based on their academic backgrounds. Content analysis of asynchronous group discussion board messages was used to measure degrees of collaboration of each group in terms…

  18. Firefighter Workplace Learning: An Exploratory Case Study

    ERIC Educational Resources Information Center

    Tracey, Edward A.

    2014-01-01

    Despite there being a significant amount of research investigating workplace learning, research exploring firefighter workplace learning is almost nonexistent. The purpose of this qualitative multi-case study was to explore how firefighters conceptualize, report, and practice workplace learning. The researcher also investigated how firefighters…

  19. Framing in the Field: A Case Study

    ERIC Educational Resources Information Center

    Benjamin, Diane

    2009-01-01

    Strategic Frame Analysis can inform the daily practice of policy advocates by bringing an evidence-based communications approach to their work. This case study of FrameWorks' decade-long association with the national Kids Count Network shares stories from advocates who are transforming their communications strategies, resulting in more effective…

  20. Grade One: Math Computation. Case Study #1

    ERIC Educational Resources Information Center

    Powell, Sarah R.; Seethaler, Pamela M.

    2007-01-01

    The purpose of this case study is to highlight the integral role that progress monitoring (PM) plays throughout any Response to Intervention (RTI) process. This example uses a three-level, responsiveness-to-intervention (RTI) method for identifying students with learning difficulties. Using a fictional first-grade classroom as the setting for…

  1. ESL and Digital Video Integration: Case Studies

    ERIC Educational Resources Information Center

    Li, J., Ed.; Gromik, N., Ed.; Edwards, N., Ed.

    2013-01-01

    It should come as no surprise that digital video technology is of particular interest to English language learners; students are drawn to its visual appeal and vibrant creative potential. The seven original case studies in this book demonstrate how video can be an effective and powerful tool to create fluid, fun, interactive, and collaborative…

  2. Experiencing Online Pedagogy: A Canadian Case Study

    ERIC Educational Resources Information Center

    Duncan, Heather E.; Barnett, John

    2010-01-01

    This case study explored the educational experiences of Canadian preservice teachers in a course designed to teach about online teaching. Students gained experience in course design and delivery, and safe and ethical behavior related to technology. Findings indicated that projects in which students actively applied their knowledge were more…

  3. Three Case Studies in Green Cleaning

    ERIC Educational Resources Information Center

    State Education Standard, 2012

    2012-01-01

    This article presents case studies from three districts implementing green cleaning. In 2008, Missouri passed legislation requiring state education officials to convene a committee of stakeholders with the purpose of developing green cleaning guidelines and specifications for schools. The guide, published by the Department of Elementary and…

  4. Value for Money Case Studies. Mendip Papers.

    ERIC Educational Resources Information Center

    Kedney, Bob, Ed.

    In response to a shift from the management of curriculum to the management of scarce resources to deliver a changing curriculum, this paper brings together three "value for money" case studies in college administration. The papers identify three levels of activity, ranging from the one-time opportunity for good housekeeping through tactical…

  5. Tachycardia During Resistance Exercise: A Case Study.

    ERIC Educational Resources Information Center

    Fry, Andrew C.; Parks, Michael J.

    2001-01-01

    This case study examined a weight-trained (WT) male who had an unusually high heart rate response to heavy resistance exercise and self-administered anabolic androgenic steroids as an ergogenic aid to training. The subject was compared to 18 other WT people. His tachycardia response occurred only in the presence of a pressure load and not with a…

  6. Physics Courses--Some Suggested Case Studies

    ERIC Educational Resources Information Center

    Swetman, T. P.

    1972-01-01

    To communicate the relevance and excitement of science activity to students, the use of more imaginative, and even openly speculative, case studies in physics courses is suggested. Some useful examples are Magnetic Monopoles, Constants, Black Holes, Antimatter, Zero Mass Particles, Tachyons, and the Bootstrap Hypothesis. (DF)

  7. Case Study of Home-School Visits

    ERIC Educational Resources Information Center

    Aguerrebere, Yolanda

    2009-01-01

    This case study evaluated one site of a California teacher home visit program. Home visits have been an important means of connecting families and schooling. In 1999, California inaugurated a statewide home visit program to promote effective partnership between home and school for low-achieving schools. At this site, families in 3 kindergarten…

  8. Learning To Teach Spanish: A Case Study.

    ERIC Educational Resources Information Center

    Velez-Rendon, Gloria

    This case study explores the student teaching experience of a Spanish language teacher candidate through her own eyes. It sheds light on how the participants' prior learning experience and beliefs inform her initial practice, how she develops her teaching skills, what contextual factors affect her learning-to-teach process, and the sources from…

  9. Performance Support Case Studies from IBM.

    ERIC Educational Resources Information Center

    Duke-Moran, Celia; Swope, Ginger; Morariu, Janis; deKam, Peter

    1999-01-01

    Presents two case studies that show how IBM addressed performance support solutions and electronic learning. The first developed a performance support and expert coaching solution; the second applied performance support to reducing implementation time and total cost of ownership of enterprise resource planning systems. (Author/LRW)

  10. WMOST v2 Case Study: Monponsett Ponds

    EPA Science Inventory

    This webinar presents an overview of the preliminary results of a case study application of EPA's Watershed Management Optimization Support Tool v2 (WMOST) for stakeholders in the Monponsett Ponds Watershed Workgroup. Monponsett Ponds is a large water system consisting of two ba...

  11. Semantically Redundant Language--A Case Study

    ERIC Educational Resources Information Center

    Rizza, Chris

    2009-01-01

    In this article, I discuss the concept of semantically redundant language through a case study of the Te Rauparaha Maori haka. I suggest that current linguistic theories cannot give a full account of ritualized speech events, of which the haka is an example, as these theories are based on a traditional dyadic model of interaction involving a…

  12. A Case Study in Learning to Unlearn

    ERIC Educational Resources Information Center

    Downes, Martin; Grummell, Bernie; Murphy, Conor; Ryan, Anne

    2015-01-01

    In this case study, Irish academics reflect on our involvement in a project--Transformative Engagement Network (TEN). This project aims to transform the nature of the engagement between the various stakeholders impacted by or concerned with climate change and to insert the voice and concerns of the most vulnerable food producers into climate…

  13. The Postmodern English Major: A Case Study.

    ERIC Educational Resources Information Center

    Schwartz, Lawrence

    2003-01-01

    Offers a case study in curriculum change that reveals a very different experience--one that demonstrates a discipline more alive than ever. Presents a story of how the lively canon debates prompted the English department at Montclair State University to restructure the English major. Finds that the culture wars, critical theory, poststructuralism,…

  14. LCA – Unique and Controversial Case Studies

    EPA Science Inventory

    This session will focus on case studies and applications that have a unique or controversial aspect. Some of the most recent topics that seem to have significant interest include: LCA-based product declarations, LCA-based standards, LCA-based labels, alternative energy, agricul...

  15. Case Study of Sabrina and Responses.

    ERIC Educational Resources Information Center

    Gourgey, Annette F.; Davis, Kevin; Lane, Linda; Smith, Lonna

    1997-01-01

    Presents a case study of an adult student preparing for her first year of college through a writing course and work in a writing workshop. Explains complicating circumstances in the student's life. Presents four professional responses commenting on the difficulties of the situation and possible solutions. (TB)

  16. Acquaintance Rape: A Case Study Approach.

    ERIC Educational Resources Information Center

    Marinelli, Rosalie D.

    1994-01-01

    Describes a case study approach to acquaintance rape used in a Personal Health and Lifestyles course at the University of Nevada in Reno that allows students to discuss the characters in a scenario, an instructional process seen as less threatening than describing personal experiences. (MDM)

  17. The Verbal Noncommunicator: A Case Study.

    ERIC Educational Resources Information Center

    Fujiki, Martin; Brinton, Bonnie

    1991-01-01

    This article presents a case study of a nine-year-old male with language impairment and specific pragmatic disabilities. His interactions with an adult, a language age-matched peer, and a chronological age-matched peer were observed and analyzed to determine conversational responsiveness and assertiveness. Findings support Fey's (1986) verbal…

  18. Aerospace Mechanisms and Tribology Technology: Case Studies

    NASA Technical Reports Server (NTRS)

    Miyoshi, Kazuhisa

    1999-01-01

    This chapter focuses attention on tribology technology practice related to vacuum tribology and space tribology. Two case studies describe aspects of real problems in sufficient detail for the engineer and the scientist to understand the tribological situations and the failures. The nature of the problems is analyzed and the range of potential solutions is evaluated. Courses of action are recommended.

  19. Climate wise case study compendium: Report 1

    SciTech Connect

    1997-02-01

    This case study compendium is one of several Climate Wise tools available to help interested companies identify cost-effective options. Climate Wise, a private-public partnership program, is a key Federal initiative to return greenhouse gas emissions to 1990 levels by 2000.

  20. Case Studies in Managing Psychological Depth.

    ERIC Educational Resources Information Center

    Ringer, Martin; Gillis, H. L.

    This paper outlines a model for assessing and managing psychological depth in outdoor and experiential group work, and presents two case studies of the complexity of such management in real life. The model contains eight levels of emotional risk and presents four criteria for assessing the level to which a particular event or discussion may lead…

  1. A Case Study in Acoustical Design.

    ERIC Educational Resources Information Center

    Ledford, Bruce R.; Brown, John A.

    1992-01-01

    Addresses concerns of both facilities planners and instructional designers in planning for the audio component of group presentations. Factors in the architectural design of enclosures for the reproduction of sound are described, including frequency, amplitude, and reverberation; and a case study for creating an acceptable enclosure is presented.…

  2. Library Virtual Tours: A Case Study

    ERIC Educational Resources Information Center

    Ashmore, Beth; Grogg, Jill E.

    2004-01-01

    Virtual tours delivered via the Web have become a common tool for both instruction and outreach. This article is a case study of the creation of a virtual tour for a university library and is intended to provide others interested in creating a virtual tour of their library the opportunity to learn from the mistakes and successes of fellow…

  3. Learning Machine Learning: A Case Study

    ERIC Educational Resources Information Center

    Lavesson, N.

    2010-01-01

    This correspondence reports on a case study conducted in the Master's-level Machine Learning (ML) course at Blekinge Institute of Technology, Sweden. The students participated in a self-assessment test and a diagnostic test of prerequisite subjects, and their results on these tests are correlated with their achievement of the course's learning…

  4. Case Studies: Windows onto Clinical Supervision.

    ERIC Educational Resources Information Center

    Nolan, Jim; And Others

    1993-01-01

    By examining the structures and activities common to six case studies of clinical teacher supervision, this article identifies five conditions that facilitate changes in teacher thinking and behavior: development of a supportive, collegial relationship; teacher control over supervision products; continuity over time; focused, descriptive records…

  5. Phonological Precedence in Dyslexia: A Case Study

    ERIC Educational Resources Information Center

    Schneider-Zioga, Patricia

    2012-01-01

    Developmental dyslexia is believed to involve a phonological deficit of which the exact properties have not been clearly established. This article presents the findings of a longitudinal case study that suggest that, at least for some people with dyslexia, the fundamental problem involves a disturbance of temporal-spatial ordering abilities. A…

  6. Acoustical case studies of three green buildings

    NASA Astrophysics Data System (ADS)

    Siebein, Gary; Lilkendey, Robert; Skorski, Stephen

    2005-04-01

    Case studies of 3 green buildings with LEED certifications that required extensive acoustical retrofit work to become satisfactory work environments for their intended user groups will be used to define areas where green building design concepts and acoustical design concepts require reconciliation. Case study 1 is an office and conference center for a city environmental education agency. Large open spaces intended to collect daylight through clerestory windows provided large, reverberant volumes with few acoustic finishes that rendered them unsuitable as open office space and a conference room/auditorium. Case Study 2 describes one of the first gold LEED buildings in the southeast whose primary design concepts were so narrowly focused on thermal and lighting issues that they often worked directly against basic acoustical requirements resulting in sound levels of NC 50-55 in classrooms and faculty offices, crosstalk between classrooms and poor room acoustics. Case study 3 is an environmental education and conference center with open public areas, very high ceilings, and all reflective surfaces made from wood and other environmentally friendly materials that result in excessive loudness when the building is used by the numbers of people which it was intended to serve.

  7. Physical Science Connected Classrooms: Case Studies

    ERIC Educational Resources Information Center

    Irving, Karen; Sanalan, Vehbi; Shirley, Melissa

    2009-01-01

    Case-study descriptions of secondary and middle school classrooms in diverse contexts provide examples of how teachers implement connected classroom technology to facilitate formative assessment in science instruction. Connected classroom technology refers to a networked system of handheld devices designed for classroom use. Teachers were…

  8. Simulations & Case Studies. [SITE 2002 Section].

    ERIC Educational Resources Information Center

    Seymour, Cathy R., Ed.

    This document contains the following papers on simulations and case studies from the SITE (Society for Information Technology & Teacher Education) 2002 conference: "3-D Virtual Classroom Technology" (Kimberly Arseneau Miller, Angela Glod); "Simulated Lesson Design Studios" (Willis Copeland); "Lights, Camera, Integration: Presentation Programs and…

  9. Delivering Online Examinations: A Case Study

    ERIC Educational Resources Information Center

    Howarth, Jason; Messing, John; Altas, Irfan

    2004-01-01

    This paper represents a brief case study of delivering online examinations to a worldwide audience. These examinations are delivered in partnership with a commercial online testing company as part of the Industry Master's degree at Charles Sturt University (CSU). The Industry Master's degree is an academic program for students currently employed…

  10. Comparative Environmental Threat Analysis: Three Case Studies.

    ERIC Educational Resources Information Center

    Latour, J. B.; Reiling, R.

    1994-01-01

    Reviews how carrying capacity for different environmental problems is operationalized. Discusses whether it is possible to compare threats, using the exceeding of carrying capacity as a yardstick. Points out problems in comparative threat analysis using three case studies: threats to European groundwater resources, threats to ecosystems in Europe,…

  11. New Case Studies of Citizen Action

    ERIC Educational Resources Information Center

    Tanner, Thomas

    1977-01-01

    Describes a six-unit case study curriculum package designed for secondary and college-level courses relating to environmental education. The units deal with nuclear power, stream channelization, a river dam project, overgrazing of public lands, agribusiness versus the family farm, and swamp preservation. (Author/DB)

  12. Sustainability in Housing: A Curriculum Case Study.

    ERIC Educational Resources Information Center

    Parrott, Kathleen; Emmel, Joann M.

    2001-01-01

    Explores the influence of environmental issues on the field of housing, from the perspective of sustainable housing. Presents a case study of the development of a college course to address these issues by integrating energy management, air quality, water quality, and waste management. (Author)

  13. Marietta Celebration of Unity Case Study.

    ERIC Educational Resources Information Center

    Philbin, Meg; Phillips, Rebecca

    This case study concerns the forming of a Marietta, Ohio unity committee, entitled Citizens for Social and Racial Justice, in response to the local Ku Klux Klan's (KKK) request for a parade permit in order to demonstrate against blacks in this city. Marietta, the county seat of Washington County, Ohio, has a population composed of both white and…

  14. CALIFORNIA PROJECT TALENT. IDENTIFICATION, CASE STUDY.

    ERIC Educational Resources Information Center

    RICE, JOSEPH P.; AND OTHERS

    THE USE OF CASE STUDIES CAN HELP THE TEACHER TO APPRECIATE INDIVIDUAL DIFFERENCES, TO CAPITALIZE ON INTERESTS AND ABILITIES, TO APPRECIATE AND UTILIZE EXCEPTIONAL SKILLS, AND TO SET UP APPROPRIATE DEVELOPMENTAL GOALS FOR INDIVIDUAL CHILDREN. AN OUTLINE FOR THE IDENTIFICATION PROCESS INCLUDES SCREENING (GROUP DEVICES), NOMINATION (STAFF MATCHES THE…

  15. It's Not Funny: A Case Study

    ERIC Educational Resources Information Center

    Méndez-Morse, Sylvia

    2015-01-01

    This case study may be used with personnel supervision, school law, and other school leadership courses. It describes the behavior and actions of one teacher toward another. Student discussions can focus on supervision, workplace mobbing, workplace bullying, as well as sexual harassment. Students should focus on a school leader's role in such…

  16. NACASETAC BAY: AN INTERACTIVE CASE STUDY

    EPA Science Inventory

    This interactive case study or "game" was created to provide a "hands on" experience in the application of a weight of evidence approach to sediment assessment. The game proceeds in two phases. In each phase the players work together as a group. A scenario is presented, and the g...

  17. A CASE STUDY OF ENVIRONMENTAL DATA MANAGEMENT

    EPA Science Inventory

    In order to support our ongoing research in watershed ecology and global climate change, we gather and analyze environmental data from several government agencies. This case study demonstrates a researcher’s approach to accessing, organizing, and using intersectoral data. T...

  18. Fraternization in Accounting Firms: A Case Study

    ERIC Educational Resources Information Center

    Heinze, Tim; Kizirian, Tim; Leese, Wallace

    2004-01-01

    This case study sheds light on how to avoid risks caused by manager-subordinate dating relationships (fraternization) such as employee misunderstandings, retaliation charges, favoritism complaints, wrongful termination lawsuits, and sexual harassment lawsuits, as well as associated ethical risks. Risk avoidance can be accomplished through a better…

  19. Teaching the Holocaust through Case Study

    ERIC Educational Resources Information Center

    Misco, Thomas

    2009-01-01

    This article responds to the curricular challenges teachers face with Holocaust education, including cursory treatments and a lack of focus on individual experiences. First, the author argues for a case-study approach to help students reengage concrete and complex features of the Holocaust as a point of departure for subsequent inquiry. In…

  20. The Campus Diversity Initiative: A Case Study

    ERIC Educational Resources Information Center

    Nayak, Sharada

    2005-01-01

    This Case Study presents the Campus Diversity Initiative (CDI), a three-phase project lead by the Educational Resources Project Centre Trust, in New Delhi, India. In a historic and cultural context different from that of India, the American Diversity Initiative was launched by the Ford Foundation in 1990 and addressed their diversity issues by…

  1. Interactive Videodisc Case Studies for Medical Education

    PubMed Central

    Harless, William G.; Zier, Marcia A.; Duncan, Robert C.

    1986-01-01

    The TIME Project of the Lister Hill National Center for Biomedical Communications is using interactive videodisc, microprocessor and voice recognition technology to create patient simulations for use in the training of medical students. These interactive case studies embody dramatic, lifelike portrayals of the social and medical conditions of a patient and allow uncued, verbal intervention by the student for independent clinical decisions.

  2. School University Collaboration: A Case Study.

    ERIC Educational Resources Information Center

    Hutchison, Robert; And Others

    A case study of school-university collaboration between Starkville School District (Mississippi) and Mississippi State University (MSU) explored the process of collaboration and the ingredients for successful implementation. MSU offered grant opportunities for university faculty to work with local school district personnel. Starkville School…

  3. The Induction of Marketing Teachers: Case Studies.

    ERIC Educational Resources Information Center

    Heath-Camp, Betty; And Others

    As part of a larger, 5-year national project, case study analyses were conducted of the induction experiences of two beginning teachers of marketing education. One teacher (Mary) entered the profession through a traditional teacher education program in marketing education. The other (Jake) obtained certification based on extensive experience in…

  4. Aerospace Mechanisms and Tribology Technology: Case Study

    NASA Technical Reports Server (NTRS)

    Miyoshi, K.

    1999-01-01

    This paper focuses attention on tribology technology practice related to vacuum tribology. A case study describes an aspect of a real problem in sufficient detail for the engineer and scientist to understand the tribological situation and the failure. The nature of the problem is analyzed and the tribological properties are examined.

  5. Evaluating Innovation: The Case Study Approach.

    ERIC Educational Resources Information Center

    Saez, Maria Jose; Carretero, Antonia J.

    1998-01-01

    Characterized the methodology of case studies, using examples from science education, with regard to their potential for the analysis of innovation and formulation of emerging trends. The theoretical and empirical support of evaluation will generate a call for negotiation as the formula that regulates the assessment of a program's efficiency and…

  6. Feasibility study report for the 200-BP-1 operable unit

    SciTech Connect

    Not Available

    1993-06-01

    This feasibility study examines a range of alternatives and provides recommendations for selecting a preferred alternative for remediating contamination at the 200-BP-1 operable unit. The 200-BP-1 operable unit is located in the center of the Hanford Site along the northern boundary of the 200 East Area. The 241-BY Tank Farm is located immediately to the south of the operable unit. 200-BP-1 is a source operable unit with contaminated soils associated primarily with nine inactive cribs (known as the 216-B cribs). These cribs were used for disposal of low-level radioactive liquid waste from U Plant uranium recovery operations, and waste storage tank condensate from the adjacent 241-BY Tank Farm. The cribs used for disposal of U Plant waste were in operation from 1955--1965, and the cribs used for disposal of tank condensate were in operation from 1965--1975. In addition to the cribs, four unplanned releases of radioactive materials have occurred within the operable unit. Contaminated surface soils associated with the unplanned releases have been consolidated over the cribs and covered with clean soil to reduce contaminant migration and exposure. Discharge of wastes to the cribs has resulted in soil and groundwater contamination. The groundwater is being addressed as part of the 200 East Aggregate Area, groundwater operable unit. Contaminated soils at the site can be categorized by the types of contaminants, their distribution in the soil column, and the risk posed by the various potential exposure pathways. Below the clean soil cover, the near surface soils contain low-levels of contamination with cesium-137, radium-226, strontium-90, thorium-228, and uranium. The lifetime incremental cancer risk associated with these soils if they were exposed at the surface is 9{times}10{sup {minus}5}.

  7. [A Successful Case of Recovery from the Amniotic Fluid Embolism with Cardiac Arrest during the Operation].

    PubMed

    Oi, Chikako; Hori, Yasuo; Sano, Hiroaki; Yamama, Yoshihiro; Nakatani, Keiji

    2015-11-01

    Amniotic fluid embolism (AFE) is a disorder with a high mortality rate. We present a case of AFE with cardiac arrest during the cesarean section who recovered sequela. A 28-year-old woman was diagnosed as low lying placenta and planned to undergo cesarean section in 38th gestational week. She had atypical genital bleeding in 32nd gestational weeks and she received emergency cesarean section under general anesthesia. After expulsion of her fetus, she lost many blood. We suspected obstetric DIC and started therapy immediately, but cardiac arrest occurred suddenly. She was resuscitated, and we decided to suspend the operation with temporary gauze-packing. After in better general condition, we removed the packed gauze from her abdomen. She could leave the intensive care unit 7 days after the first operation. In this case, the crucial points for successful resuscitation were prompt obstetric anesthesiologist involvement and good communication with obstetricians. PMID:26689072

  8. [Unexpected atrial fibrillation when monitoring in operating room. Case of the trimester].

    PubMed

    2014-05-01

    A real case reported to the SENSAR database of incidents is presented. In a patient scheduled for nose fracture repair surgery an unexpected atrial fibrillation was found when monitored in the operating room. The operation was not delayed. After induction of general anaesthesia heart rate suddenly increased and hemodinamic situation was impaired. Cardioversion was required. Two electric countershocks were given but sinus rhythm was not restored. Heart rate was controlled with amiodarone infusion. Optimal defibrillation characteristics are described in these cases. Increased risk of thromboembolism (1-2%) following cardioversion is present even if atrial thrombi are ruled out. The mainstay therapies of are rhythm and rate control and prevention of thromboembolic complications. We describe recommendations on the management of these critical situations with emphasis in learning through the creation of protocols and training practice in simulation. PMID:24287084

  9. Empathy Development Through Case Study and Simulation.

    PubMed

    Mennenga, Heidi A; Bassett, Susan; Pasquariello, Libby

    2016-01-01

    Because empathy is integral to the nurse-patient relationship, nurse educators are challenged to explore teaching strategies that may aid in the development of empathy among students. The purpose of this study was to determine whether consistent exposure to a single patient through case study and simulation had an impact on empathy levels in senior-level baccalaureate nursing students. Results provide interesting conclusions for faculty members and offer a basis for ongoing discussion. PMID:26448156

  10. Socio-economic differences and health seeking behaviour for the diagnosis and treatment of malaria: a case study of four local government areas operating the Bamako initiative programme in south-east Nigeria

    PubMed Central

    Uzochukwu, Benjamin SC; Onwujekwe, Obinna E

    2004-01-01

    Background Malaria is one of the leading causes of mortality and morbidity in Nigeria. It is not known how user fees introduced under the Bamako Initiative (BI) system affect healthcare seeking among different socio-economic groups in Nigeria for diagnosis and treatment of malaria. Reliable information is needed to initiate new policy thrusts to protect the poor from the adverse effect of user fees. Methods Structured questionnaires were used to collect information from 1594 female household primary care givers or household head on their socio-economic and demographic status and use of malaria diagnosis and treatment services. Principal components analysis was used to create a socio-economic status index which was decomposed into quartiles and chi-square for trends was used to calculate for any statistical difference. Results The study showed that self diagnosis was the commonest form of diagnosis by the respondents. This was followed by diagnosis through laboratory tests, community health workers, family members and traditional healers. The initial choice of care for malaria was a visit to the patent medicine dealers for most respondents. This was followed by visit to the government hospitals, the BI health centres, traditional medicine healers, private clinics, community health workers and does nothing at home. Furthermore, the private health facilities were the initial choice of treatment for the majority with a decline among those choosing them as a second source of care and an increase in the utilization of public health facilities as a second choice of care. Self diagnosis was practiced more by the poorer households while the least poor used the patent medicine dealers and community health workers less often for diagnosis of malaria. The least poor groups had a higher probability of seeking treatment at the BI health centres (creating equity problem in BI), hospitals, and private clinics and in using laboratory procedures. The least poor also used the patent

  11. Seismic damage to pipeline; Case study

    SciTech Connect

    O'Rourke, M.J.; Ayala, G. . Dept. of Civil Engineering)

    1990-03-01

    A case study of damage to a welded steel pipeline in Mexico City, caused by the 1985 Michoacan earthquake, is presented. Seismic damage to pipelines in past earthquakes is briefly reviewed. The damage has typically been due to seismic wave propagation or permanent ground deformations, such as faulting, landslides, or lateral spreads. Physical characteristics of the case study pipeline, pertinent soil conditions, recorded ground motion, and observed seismic damage in Mexico City are then presented. The recorded ground motion in the lake zone of Mexico City suggests a significant contribution from Rayleigh waves. A previously developed analysis procedure is used to estimate stress induced by seismic wave propagation in the case study pipeline. The pipeline stress is a function of the amplitude and wavelength of the ground strain, maximum friction forces at the soil-pipe interface, and the stress-strain characteristics of the pipeline material. It is shown that the estimated stress is only slightly less than the local compressional buckling stress for the case history pipeline.

  12. Generating grounded theory: two case studies.

    PubMed

    Mullen, P D

    1985-01-01

    An inductive research method known as grounded theory is described as a means of building conceptual bridges between real-life situations and formal theory. The procedures are detailed and illustrated via two case studies. The first is a study of the social-psychological problem of cutting losses among heart patients through three stages of recovery. The process of extending the theory generated with the heart patients to other invisible physical impairments and across both visible and invisible chronic conditions is outlined. The second case study offers an example of a structurally-oriented theory, developed from participant observations of the processes of managing patients, staff, and neighbors for an "antipsychiatric" treatment facility for juvenile schizophrenics. PMID:20841268

  13. National facilities study. Volume 4: Space operations facilities task group

    NASA Technical Reports Server (NTRS)

    1994-01-01

    The principal objectives of the National Facilities Study (NFS) were to: (1) determine where U.S. facilities do not meet national aerospace needs; (2) define new facilities required to make U.S. capabilities 'world class' where such improvements are in the national interest; (3) define where consolidation and phase-out of existing facilities is appropriate; and (4) develop a long-term national plan for world-class facility acquisition and shared usage. The Space Operations Facilities Task Group defined discrete tasks to accomplish the above objectives within the scope of the study. An assessment of national space operations facilities was conducted to determine the nation's capability to meet the requirements of space operations during the next 30 years. The mission model used in the study to define facility requirements is described in Volume 3. Based on this model, the major focus of the Task Group was to identify any substantive overlap or underutilization of space operations facilities and to identify any facility shortfalls that would necessitate facility upgrades or new facilities. The focus of this initial study was directed toward facility recommendations related to consolidations, closures, enhancements, and upgrades considered necessary to efficiently and effectively support the baseline requirements model. Activities related to identifying facility needs or recommendations for enhancing U.S. international competitiveness and achieving world-class capability, where appropriate, were deferred to a subsequent study phase.

  14. Parametric Optimization of Some Critical Operating System Functions--An Alternative Approach to the Study of Operating Systems Design

    ERIC Educational Resources Information Center

    Sobh, Tarek M.; Tibrewal, Abhilasha

    2006-01-01

    Operating systems theory primarily concentrates on the optimal use of computing resources. This paper presents an alternative approach to teaching and studying operating systems design and concepts by way of parametrically optimizing critical operating system functions. Detailed examples of two critical operating systems functions using the…

  15. Space station automation and robotics study. Operator-systems interface

    NASA Technical Reports Server (NTRS)

    1984-01-01

    This is the final report of a Space Station Automation and Robotics Planning Study, which was a joint project of the Boeing Aerospace Company, Boeing Commercial Airplane Company, and Boeing Computer Services Company. The study is in support of the Advanced Technology Advisory Committee established by NASA in accordance with a mandate by the U.S. Congress. Boeing support complements that provided to the NASA Contractor study team by four aerospace contractors, the Stanford Research Institute (SRI), and the California Space Institute. This study identifies automation and robotics (A&R) technologies that can be advanced by requirements levied by the Space Station Program. The methodology used in the study is to establish functional requirements for the operator system interface (OSI), establish the technologies needed to meet these requirements, and to forecast the availability of these technologies. The OSI would perform path planning, tracking and control, object recognition, fault detection and correction, and plan modifications in connection with extravehicular (EV) robot operations.

  16. A Three Year Clinicopathological Study of Cases of Rupture Uterus

    PubMed Central

    Rathod, Setu; Swain, Sujata

    2015-01-01

    Introduction Rupture uterus is a life threatening obstetric complication with serious maternal and fetal side-effects. We report a 3 year (2010-2013) retrospective clinical study of pregnancy with rupture uterus cases attending a tertiary care hospital. Aim The aim of the study was to evaluate the incidence of rupture uterus, incidence as per age, parity, clinical presentations, risk factors, complications and management. Materials and Methods Retrospective data of 74 cases of rupture uterus in SCB Medical college, Cuttack was collected from case records of 26,547 deliveries during a 3 year span (2010-2013). Parameters like cause of rupture, type, site of rupture and outcome were recorded. The collected data was analysed by SPSS software v19. Results Out of 26,547 deliveries during the three year period, there were 74 cases of rupture uterus with an incidence of rupture 1 in 359 (0.28%). The mean age of rupture uterus was 27.4 years. 95.8% were multigravida and majority were referred cases from low socioeconomic status. Only 40.5% had the required minimum of four antenatal visits as recommended by WHO (World Health Organisation). A total of 48.6% of cases with rupture uterus had history of previous Caesarean section. Prolonged labour was present in 75.6% of the cases. Only 12.2% of the cases had history of oxytocin use whereas 9.5% had undergone an operative vaginal delivery. Obstructed labour was the cause in 24.3% of cases, 85.1% had complete rupture. Majority had a rupture in the anterior wall (69%) and 81.1% had rupture in lower segment of uterus. Only 17.6% had broad ligament haematoma, 10.8% colporrhexis and 6.8% had associated bladder injury. Repair was possible in only 39.2% of cases, whereas majority landed up in hysterectomy. Internal iliac ligation was done in 2.7% of cases. Perinatal mortality was 90.5% whereas maternal death was seen in 13.5% cases. One patient developed VVF (vesicovaginal fistula). Duration of hospital stay was upto 14 days in 81

  17. Gas pockets in a wastewater rising main: a case study.

    PubMed

    Pozos-Estrada, Oscar; Fuentes-Mariles, Oscar A; Pozos-Estrada, Adrian

    2012-01-01

    This paper presents a case study of an existing wastewater rising main (WWRM) in which an extreme transient event produced by simultaneous power failure of the pumps caused the rupture of a 1.2 m (48 in) prestressed concrete cylinder pipe (PCCP), causing an important leakage of sewage. The event and the methodology followed in order to validate the diagnostics of the failure are described. The detail study included in situ observation of the system, experimental investigation in a setup, hydraulic analysis, as well as details of the structural strength of the WWRM. After the extensive investigation and several simulations of fluid transients for different scenarios and flow conditions, it was found that stationary small gas pockets accumulated at high points of the WWRM were identified as the principal contributory factor of the failure. This case study serves as clear warning of the consequences of operating a WWRM with gas pockets at its high points. PMID:22949261

  18. 26 CFR 1.614-3 - Rules relating to separate operating mineral interests in the case of mines.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... aggregate separate operating mineral interests—(1) General rule. Except in the case of oil and gas wells, a... rule. Except in the case of oil and gas wells, a taxpayer who owns a separate operating mineral... mineral deposit except oil and gas deposits. For the purpose of the preceding sentence, the...

  19. 26 CFR 1.614-3 - Rules relating to separate operating mineral interests in the case of mines.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... aggregate separate operating mineral interests—(1) General rule. Except in the case of oil and gas wells, a... rule. Except in the case of oil and gas wells, a taxpayer who owns a separate operating mineral... mineral deposit except oil and gas deposits. For the purpose of the preceding sentence, the...

  20. 26 CFR 1.614-3 - Rules relating to separate operating mineral interests in the case of mines.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... aggregate separate operating mineral interests—(1) General rule. Except in the case of oil and gas wells, a... rule. Except in the case of oil and gas wells, a taxpayer who owns a separate operating mineral... mineral deposit except oil and gas deposits. For the purpose of the preceding sentence, the...

  1. 36th Annual Maintenance & Operations Cost Study: Colleges

    ERIC Educational Resources Information Center

    Agron, Joe

    2007-01-01

    Colleges are focusing increased effort--and money--to improve the physical condition of existing facilities and address a huge backlog of deferred maintenance. According to "American School & University's" 36th annual Maintenance and Operations (M&O) Cost Study, the median college spends 16.4% of total college budget on M&O, up from 11% the year…

  2. Analysis of remote operating systems for space-based servicing operations. Volume 2: Study results

    NASA Technical Reports Server (NTRS)

    1985-01-01

    The developments in automation and robotics have increased the importance of applications for space based servicing using remotely operated systems. A study on three basic remote operating systems (teleoperation, telepresence and robotics) was performed in two phases. In phase one, requirements development, which consisted of one three-month task, a group of ten missions were selected. These included the servicing of user equipment on the station and the servicing of the station itself. In phase two, concepts development, which consisted of three tasks, overall system concepts were developed for the selected missions. These concepts, which include worksite servicing equipment, a carrier system, and payload handling equipment, were evaluated relative to the configurations of the overall worksite. It is found that the robotic/teleoperator concepts are appropriate for relatively simple structured tasks, while the telepresence/teleoperator concepts are applicable for missions that are complex, unstructured tasks.

  3. Energy management study: A proposed case of government building

    SciTech Connect

    Tahir, Mohamad Zamhari; Nawi, Mohd Nasrun Mohd; Baharum, Mohd Faizal

    2015-05-15

    Align with the current needs of the sustainable and green technology in Malaysian construction industry, this research is conducted to seek and identify opportunities to better manage energy use including the process of understand when, where, and how energy is used in a building. The purpose of this research is to provide a best practice guideline as a practical tool to assist construction industry in Malaysia to improve the energy efficiency of the office building during the post-production by reviewing the current practice of the building operation and maintenance in order to optimum the usage and reduce the amount of energy input into the building. Therefore, this paper will review the concept of maintenance management, current issue in energy management, and on how the research process will be conducted. There are several process involves and focuses on technical and management techniques such as energy metering, tracing, harvesting, and auditing based on the case study that will be accomplish soon. Accordingly, a case study is appropriate to be selected as a strategic research approach in which involves an empirical investigation of a particular contemporary phenomenon within its real life context using multiple sources of evidence for the data collection process. A Government office building will be selected as an appropriate case study for this research. In the end of this research, it will recommend a strategic approach or model in a specific guideline for enabling energy-efficient operation and maintenance in the office building.

  4. Energy management study: A proposed case of government building

    NASA Astrophysics Data System (ADS)

    Tahir, Mohamad Zamhari; Nawi, Mohd Nasrun Mohd; Baharum, Mohd Faizal

    2015-05-01

    Align with the current needs of the sustainable and green technology in Malaysian construction industry, this research is conducted to seek and identify opportunities to better manage energy use including the process of understand when, where, and how energy is used in a building. The purpose of this research is to provide a best practice guideline as a practical tool to assist construction industry in Malaysia to improve the energy efficiency of the office building during the post-production by reviewing the current practice of the building operation and maintenance in order to optimum the usage and reduce the amount of energy input into the building. Therefore, this paper will review the concept of maintenance management, current issue in energy management, and on how the research process will be conducted. There are several process involves and focuses on technical and management techniques such as energy metering, tracing, harvesting, and auditing based on the case study that will be accomplish soon. Accordingly, a case study is appropriate to be selected as a strategic research approach in which involves an empirical investigation of a particular contemporary phenomenon within its real life context using multiple sources of evidence for the data collection process. A Government office building will be selected as an appropriate case study for this research. In the end of this research, it will recommend a strategic approach or model in a specific guideline for enabling energy-efficient operation and maintenance in the office building.

  5. Marketing and clinical trials: a case study

    PubMed Central

    Francis, David; Roberts, Ian; Elbourne, Diana R; Shakur, Haleema; Knight, Rosemary C; Garcia, Jo; Snowdon, Claire; Entwistle, Vikki A; McDonald, Alison M; Grant, Adrian M; Campbell, Marion K

    2007-01-01

    Background Publicly funded clinical trials require a substantial commitment of time and money. To ensure that sufficient numbers of patients are recruited it is essential that they address important questions in a rigorous manner and are managed well, adopting effective marketing strategies. Methods Using methods of analysis drawn from management studies, this paper presents a structured assessment framework or reference model, derived from a case analysis of the MRC's CRASH trial, of 12 factors that may affect the success of the marketing and sales activities associated with clinical trials. Results The case study demonstrates that trials need various categories of people to buy in – hence, to be successful, trialists must embrace marketing strategies to some extent. Conclusion The performance of future clinical trials could be enhanced if trialists routinely considered these factors. PMID:18028537

  6. Case studies of soil in art

    NASA Astrophysics Data System (ADS)

    Feller, C.; Landa, E. R.; Toland, A.; Wessolek, G.

    2015-08-01

    The material and symbolic appropriations of soil in artworks are numerous and diverse, spanning many centuries and artistic traditions, from prehistoric painting and ceramics to early Renaissance works in Western literature, poetry, paintings, and sculpture, to recent developments in film, architecture, and contemporary art. Case studies focused on painting, installation, and film are presented with the view of encouraging further exploration of art about, in, and with soil as a contribution to raising soil awareness.

  7. Neuropathology of supercentenarians - four autopsy case studies.

    PubMed

    Takao, Masaki; Hirose, Nobuyoshi; Arai, Yasumichi; Mihara, Ban; Mimura, Masaru

    2016-01-01

    Supercentenarians (aged 110 years old or more) are extremely rare in the world population (the number of living supercentenarians is estimated as 47 in the world), and details about their neuropathological information are limited. Based on previous studies, centenarians (aged 100-109 years old) exhibit several types of neuropathological changes, such as Alzheimer's disease and Lewy body disease pathology, primary age-related tauopathy, TDP-43 pathology, and hippocampal sclerosis. In the present study, we provide results from neuropathological analyses of four supercentenarian autopsy cases using conventional and immunohistochemical analysis for neurodegenerative disorders. In particular, we focused on the pathology of Alzheimer's disease and Lewy body disease, as well as the status of hippocampal sclerosis, TDP-43 pathology, aging-related tau astrogliopathy, and cerebrovascular diseases. Three cases were characterized as an "intermediate" level of Alzheimer's disease changes (NIA-AA guideline) and one was characterized as primary age-related tauopathy. TDP-43 deposits were present in the hippocampus in two cases. Neither Lewy body pathology nor hippocampal sclerosis was observed. Aging-related tau astrogliopathy was consistently observed, particularly in the basal forebrain. Small vessel diseases were also present, but they were relatively mild for cerebral amyloid-beta angiopathy and arteriolosclerosis. Although our study involved a small number of cases, the results provide a better understanding about human longevity. Neuropathological alterations associated with aging were mild to moderate in the supercentenarian brain, suggesting that these individuals might have some neuroprotective factors against aging. Future prospective studies and extensive molecular analyses are needed to determine the mechanisms of human longevity. PMID:27590044

  8. Clidar Mountain Boundary Layer Case Studies

    NASA Astrophysics Data System (ADS)

    Sharma, Nimmi C. P.; Barnes, John E.

    2016-06-01

    A CCD Camera Lidar system called the CLidar system images a vertically pointing laser from the side with a spatially separated CCD camera and wide angle optics. The system has been used to investigate case studies of aerosols in mountain boundary layers in in the times following sunset. The aerosols detected by the system demonstrate the wide variation of near ground aerosol structure and capabilities of the CLidar system.

  9. Functional Disorders in Neurology: Case Studies.

    PubMed

    Stone, Jon; Hoeritzauer, Ingrid; Gelauff, Jeannette; Lehn, Alex; Gardiner, Paula; van Gils, Anne; Carson, Alan

    2016-08-01

    Functional, often called psychogenic, disorders are common in neurological practice. We illustrate clinical issues and highlight some recent research findings using six case studies of functional neurological disorders. We discuss dizziness as a functional disorder, describing the relatively new consensus term Persistent Posturo-Perceptual Dizziness (PPPD), axial jerking/myoclonus as a functional movement disorder, functional speech symptoms, post-concussion disorder with functional cognitive symptoms and finally advances in treatment of dissociative seizures and functional motor disorders. PMID:27445247

  10. An avionics sensitivity study. Volume 1: Operational considerations

    NASA Technical Reports Server (NTRS)

    Scott, R. W.; Mcconkey, E. D.

    1976-01-01

    Equipment and operational concepts affecting aircraft in the terminal area are reported. Curved approach applications and modified climb and descent procedures for minimum fuel consumption are considered. The curved approach study involves the application of MLS guidance to enable execution of the current visual approach to Washington National Airport under instrument flight conditions. The operational significance and the flight path control requirements involved in the application of curved approach paths to this situation are considered. Alternative flight path control regimes are considered to achieve minimum fuel consumption subject to constraints related to air traffic control requirements, flight crew and passenger reactions, and airframe and powerplant limitations.

  11. A study of eigenvalue sensitivity for hydrodynamic stability operators

    NASA Technical Reports Server (NTRS)

    Schmid, Peter J.; Henningson, Dan S.; Khorrami, Mehdi R.; Malik, Mujeeb R.

    1993-01-01

    The eigenvalue sensitivity for hydrodynamic stability operators is investigated. Classical matrix perturbation techniques as well as the concept of epsilon-pseudospectra are applied to show that parts of the spectrum are highly sensitive to small perturbations. Applications are drawn from incompressible plane Couette flow, trailing line vortex flow, and compressible Blasius boundary-layer flow. Parameter studies indicate a monotonically increasing effect of the Reynolds number on the sensitivity. The phenomenon of eigenvalue sensitivity is due to the nonnormality of the operators and their discrete matrix analogs and may be associated with large transient growth of the corresponding initial value problem.

  12. Orbital transfer vehicle launch operations study. Processing flows. Volume 3

    NASA Technical Reports Server (NTRS)

    1986-01-01

    The Orbit Transfer Vehicle (OTV) processing flow and Resource Identification Sheets (RISs) for the ground based orbit transfer vehicle and for the space based orbit transfer vehicle are the primary source of information for the rest of the Kennedy Space Center (KSC) OTV Launch Operations Study. Work is presented which identifies KSC facility requirements for the OTV Program, simplifies or automates either flow though the application technology, revises test practices and identifies crew sizes or skills used. These flows were used as the primary point of departure from current operations and practices. Analyses results were documented by revising the appropriate RIS page.

  13. Shuttle Transportation System Case-Study Development

    NASA Technical Reports Server (NTRS)

    Ransom, Khadijah

    2012-01-01

    A case-study collection was developed for NASA's Space Shuttle Program. Using lessons learned and documented by NASA KSC engineers, analysts, and contractors, decades of information related to processing and launching the Space Shuttle was gathered into a single database. The goal was to provide educators with an alternative means to teach real-world engineering processes and to enhance critical thinking, decision making, and problem solving skills. Suggested formats were created to assist both external educators and internal NASA employees to develop and contribute their own case-study reports to share with other educators and students. Via group project, class discussion, or open-ended research format, students will be introduced to the unique decision making process related to Shuttle missions and development. Teaching notes, images, and related documents will be made accessible to the public for presentation of Space Shuttle reports. Lessons investigated included the engine cutoff (ECO) sensor anomaly which occurred during mission STS-114. Students will be presented with general mission infom1ation as well as an explanation of ECO sensors. The project will conclude with the design of a website that allows for distribution of information to the public as well as case-study report submissions from other educators online.

  14. Steel: Reducing BOF Hood Scrubber Energy Costs at a Steel Mill (Technical Case Study)

    SciTech Connect

    Ericksen, E.

    1999-01-27

    This OIT Technical Case Study reveals how Bethlehem Steel Corporation, by installing a variable-frequency drive and making associated equipment modifications, was able to save energy, reduce operational costs, and decrease system maintenance.

  15. Co-operative Education: Studies of Learning from Workplace Experience.

    ERIC Educational Resources Information Center

    Munby, Hugh; Chin, Peter; Hutchinson, Nancy L.; Young, Jonathan

    Case studies were conducted of four female cooperative education (co-op) students who participated in two 4-month co-op placements in a veterinary clinic as part of a high school biology credit. Two graduate students gathered data onsite during two phases: an initial 2-month period that oriented the methods of the inquiry at the clinic to match…

  16. Ground Operations Aerospace Language (GOAL). Volume 1: Study overview

    NASA Technical Reports Server (NTRS)

    1973-01-01

    A series of NASA and Contractor studies sponsored by NASA/KSC resulted in a specification for the Ground Operations Aerospace Language (GOAL). The Cape Kennedy Facility of the IBM Corporation was given the responsibility, under existing contracts, to perform an analysis of the Language Specification, to design and develop a GOAL Compiler, to provide a specification for a data bank, to design and develop an interpretive code translator, and to perform associated application studies.

  17. [Anatomic repair of transposition of the great arteries or arterial switch operation. Report of 62 cases].

    PubMed

    Abid, Fekria; Chaker, Lilia; Hakim, Khaouther; Larbi, Chiheb; Ouarda, Fatma; Msaad, Hela; Mechmeche, Rachid

    2004-01-01

    Between January 1990 and September 2003, 62 patients underwent anatomic repair of a transposition of the great arteries. Mean operative age is 40 days. Transposition of the great arteries was simple in 38 cases and associated to a large ventricular septal defect in 24 cases. 44 patients have had an atrial septostomy of Rashkind and 45 an infusion of prostaglandin E 1.5 patients with simple transposition of the great arteries have had left ventricular retraining before arteriel switch. In association to arterial switch, were performed closure of ventricular septal defect in 24 cases, cure of coarctation of the aorta in 4 cases and cure of an abnormal partial pulmonary venous return in 1 case. Early mortality was 6,45%. After a mean follow up of 3 years, one patient died suddenly (late mortality is 1.72%) and one patient had to have 2 reoperations. Results of anatomic repair are now excellent. Late mortality is essentially related to coronary complications so that a careful follow-up is mandatory. PMID:15127697

  18. Case study of isosurface extraction algorithm performance

    SciTech Connect

    Sutton, P M; Hansen, C D; Shen, H; Schikore, D

    1999-12-14

    Isosurface extraction is an important and useful visualization method. Over the past ten years, the field has seen numerous isosurface techniques published leaving the user in a quandary about which one should be used. Some papers have published complexity analysis of the techniques yet empirical evidence comparing different methods is lacking. This case study presents a comparative study of several representative isosurface extraction algorithms. It reports and analyzes empirical measurements of execution times and memory behavior for each algorithm. The results show that asymptotically optimal techniques may not be the best choice when implemented on modern computer architectures.

  19. Using Case Studies to Teach About Global Issues, Bali: A Case Study

    ERIC Educational Resources Information Center

    Oswald, James M.

    1974-01-01

    The South Pacific island of Bali is used as a case study of overpopulation and food shortage. A brief description of the resources, the typical lifestyle of the Balinese farmer, and possible teaching techniques are given. (DE)

  20. Using Case Study Analysis and Case Writing to Structure Clinical Experiences in a Teacher Education Program

    ERIC Educational Resources Information Center

    Floyd, Deborah M.; Bodur, Yasar

    2005-01-01

    This study reports on the design and results of a two-semester study on the use of case study analysis and case writing in clinical experiences in an undergraduate teacher education program. Findings indicated that structured experiences with case studies and case writing increase preservice teachers' informed decision making on educational…

  1. Mission Operations Planning with Preferences: An Empirical Study

    NASA Technical Reports Server (NTRS)

    Bresina, John L.; Khatib, Lina; McGann, Conor

    2006-01-01

    This paper presents an empirical study of some nonexhaustive approaches to optimizing preferences within the context of constraint-based, mixed-initiative planning for mission operations. This work is motivated by the experience of deploying and operating the MAPGEN (Mixed-initiative Activity Plan GENerator) system for the Mars Exploration Rover Mission. Responsiveness to the user is one of the important requirements for MAPGEN, hence, the additional computation time needed to optimize preferences must be kept within reasonabble bounds. This was the primary motivation for studying non-exhaustive optimization approaches. The specific goals of rhe empirical study are to assess the impact on solution quality of two greedy heuristics used in MAPGEN and to assess the improvement gained by applying a linear programming optimization technique to the final solution.

  2. Tisettanta case study: the interoperation of furniture production companies

    NASA Astrophysics Data System (ADS)

    Amarilli, Fabrizio; Spreafico, Alberto

    This chapter presents the Tisettanta case study, focusing on the definition of the possible innovations that ICT technologies can bring to the Italian wood-furniture industry. This sector is characterized by industrial clusters composed mainly of a few large companies with international brand reputations and a large base of SMEs that manufacture finished products or are specialized in the production of single components/processes (such as the Brianza cluster, where Tisettanta operates). In this particular business ecosystem, ICT technologies can bring relevant support and improvements to the supply chain process, where collaborations between enterprises are put into action through the exchange of business documents such as orders, order confirmation, bills of lading, invoices, etc. The analysis methodology adopted in the Tisettanta case study refers to the TEKNE Methodology of Change (see Chapter 2), which defines a framework for supporting firms in the adoption of the Internetworked Enterprise organizational paradigm.

  3. Fatigue case study and loading spectra for wind turbines

    NASA Astrophysics Data System (ADS)

    Sutherland, H. J.

    The paper discusses two aspects of Sandia's Wind Energy Program. The first section of the paper presents a case study of fatigue in wind turbines. This case study was prepared for the American Society of Testing Material's (ASTM) Standard Technical Publication (STP) on fatigue education. Using the LIFE2 code, the student is lead through the process of cumulative damage summation for wind turbines and typical data are used to demonstrate the range of life estimates that will result from typical parameter variations. The second section summarizes the results from a workshop held by Sandia and the National Renewable Energy Laboratory (NREL) to discuss fatigue life prediction methodologies. This section summarizes the workshop discussions on the use of statistical modeling to deduce the shape and magnitude of the low-probability-of-occurrence, high-stress tail of the load distribution on a wind turbine during normal operation.

  4. Teaching Freedom of Speech through the Case Study Method.

    ERIC Educational Resources Information Center

    Kane, Peter E.

    The use of case studies or case histories of Supreme Court cases concerning freedom of speech often provides the "real world" dimension that is too often lacking in the teaching of this area. The case study or case history is a coherent narrative of the historical events designed to illuminate the issues involved in a specific situation. Such…

  5. Weather Forecasting for Ka-band Operations: Initial Study Results

    NASA Astrophysics Data System (ADS)

    Morabito, D.; Wu, L.; Slobin, S.

    2016-08-01

    As lower frequency bands (e.g., 2.3 GHz and 8.4 GHz) have become oversubscribed during the past several decades, NASA has become interested in using higher frequency bands (e.g., 26 GHz and 32 GHz) for telemetry, thus making use of the available wider bandwidth. However, these bands are more susceptible to atmospheric degradation. Currently, flight projects tend to be conservative in preparing their communications links by using worst-case or conservative assumptions. Such assumptions result in nonoptimum data return. We explore the use of weather forecasting for Goldstone and Madrid for different weather condition scenarios to determine more optimal values of atmospheric attenuation and atmospheric noise temperature for use in telecommunication link design. We find that the use of weather forecasting can provide up to 2 dB or more of increased data return when more favorable conditions are forecast. Future plans involve further developing the technique for operational scenarios with interested flight projects.

  6. A community-based study of asthenopia in computer operators

    PubMed Central

    Choudhary, Sushilkumar; Doshi, Vikas G

    2008-01-01

    Context: There is growing body of evidence that use of computers can adversely affect the visual health. Considering the rising number of computer users in India, computer-related asthenopia might take an epidemic form. In view of that, this study was undertaken to find out the magnitude of asthenopia in computer operators and its relationship with various personal and workplace factors. Aims: To study the prevalence of asthenopia among computer operators and its association with various epidemiological factors. Settings and Design: Community-based cross-sectional study of 419 subjects who work on computer for varying period of time. Materials and Methods: Four hundred forty computer operators working in different institutes were selected randomly. Twenty-one did not participate in the study, making the nonresponse rate 4.8%. Rest of the subjects (n = 419) were asked to fill a pre-tested questionnaire, after obtaining their verbal consent. Other relevant information was obtained by personal interview and inspection of workstation. Statistical Analysis Used: Simple proportions and Chi-square test. Results: Among the 419 subjects studied, 194 (46.3%) suffered from asthenopia during or after work on computer. Marginally higher proportion of asthenopia was noted in females compared to males. Occurrence of asthenopia was significantly associated with age of starting use of computer, presence of refractive error, viewing distance, level of top of the computer screen with respect to eyes, use of antiglare screen and adjustment of contrast and brightness of monitor screen. Conclusions: Prevalence of asthenopia was noted to be quite high among computer operators, particularly in those who started its use at an early age. Individual as well as work-related factors were found to be predictive of asthenopia. PMID:18158404

  7. Landfill mining: Case study of a successful metals recovery project.

    PubMed

    Wagner, Travis P; Raymond, Tom

    2015-11-01

    Worldwide, the generation of municipal solid waste (MSW) is increasing and landfills continue to be the dominant method for managing solid waste. Because of inadequate diversion of reusable and recoverable materials, MSW landfills continue to receive significant quantities of recyclable materials, especially metals. The economic value of landfilled metals is significant, fostering interest worldwide in recovering the landfilled metals through mining. However, economically viable landfill mining for metals has been elusive due to multiple barriers including technological challenges and high costs of processing waste. The objective of this article is to present a case study of an economically successful landfill mining operation specifically to recover metals. The mining operation was at an ashfill, which serves a MSW waste-to-energy facility. Landfill mining operations began in November 2011. Between December 2011 and March 2015, 34,352 Mt of ferrous and non-ferrous metals were recovered and shipped for recycling, which consisted of metals >125 mm (5.2%), 50-125 mm (85.9%), <50mm (3.4%), zorba (4.6%), and mixed products (0.8%). The conservative estimated value of the recovered metal was $7.42 million. Mining also increased the landfill's airspace by 10,194 m(3) extending the life of the ashfill with an estimated economic value of $267,000. The estimated per-Mt cost for the extraction of metal was $158. This case study demonstrates that ashfills can be profitably mined for metals without financial support from government. Although there are comparatively few ashfills, the results and experience obtained from this case study can help foster further research into the potential recovery of metals from raw, landfilled MSW. PMID:26152366

  8. An Unusual Case of Post-Operative Spondylitis Caused by Mycobacterium Intracellulare in an Immunosuppressed Patient

    PubMed Central

    Kim, Sung Hoon; Lee, Sang Weon; Song, Geun Sung

    2011-01-01

    There are few reported cases of post-operative spondylitis caused by Mycobacterium intracellulare. A 75-year-old female presented to our hospital with low back pain and paraparesis after a fall. The radiologic examination revealed compression fractures of L1, L3 and L4 and an epidural hematoma compressing the spinal cord. The dark-red epidural hematoma was urgently evacuated. Four weeks post-operatively, neurologic deficits recurred with fever. On magnetic resonance image, an epidural abscess and osteomyelitis were detected in the previous operative site. Five weeks post-operatively, revision was performed with multiple biopsies. The specimen were positive for acid-fast bacilli and traditional anti-tuberculous medications were started. Because the Polymerase Chain Reaction for non-tuberculous mycobacterium (NTM) was positive, the anti-tuberculous medications were changed to anti-NTM drugs. However, the neurologic deficits did not improve and persistent elevation of erythrocyte sedimentation rate and C-reactive protein were noted. Eight weeks after the revision, Mycobacterium intracellulare was detected in the specimen cultures. Despite supportive care with medication, the patient died due to multiple organ failure. PMID:22259695

  9. Atypical Presentation of Tuberculosis of Elbow Joint in Operated Case of Distal Humerus Fracture

    PubMed Central

    Gaikwad, Yogesh; Khadilkar, Madhav; Ranade, Ashish S.; Vartak, Devendra N.

    2015-01-01

    Introduction: A typical presentations of tuberculosis are not uncommon. Periprosthetic infection with tuberculosis after total joint replacement has well published. Tuberculosis of the elbow following open reduction internal fixation of a distal humerus fraeture is extremely rare. Case Report: We report case of a healthy, immunocompetenet 49-year-old male who underwent open reduction and internal fixation with bicolumnar plating for distal humerus fracture and presented after 18 month with cystic swelling over medial aspect of operated site. There was no wound dehiscence and the underlying fracture was healed well without any signs of implant loosening or bony involvement. Cystic swelling was excised and histopathology provided the diagnosis of tuberculosis. Patient was treated with anti tubercular chemotherapy and patient made uneventful recovery. Conclusion: Although synovial tuberculosis after fracture fixation is a rare entity, tuberculosis should be kept as a differential diagnosis. Surgeons should have high index of suspicion to diagnose atypical presentations of tuberculosis. PMID:27299044

  10. On the fixed points of monotonic operators in the critical case

    NASA Astrophysics Data System (ADS)

    Engibaryan, N. B.

    2006-10-01

    We consider the problem of constructing positive fixed points x of monotonic operators \\varphi acting on a cone K in a Banach space E. We assume that \\Vert\\varphi x\\Vert\\le\\Vert x\\Vert+\\gamma, \\gamma>0, for all x\\in K. In the case when \\varphi has a so-called non-trivial dissipation functional we construct a solution in an extension of E, which is a Banach space or a Fréchet space. We consider examples in which we prove the solubility of a conservative integral equation on the half-line with a sum-difference kernel, and of a non-linear integral equation of Urysohn type in the critical case.

  11. Case Study Evaluations: A Case in Point. An Illustrative Report and Mathodological Analysis of Case Study Evaluations.

    ERIC Educational Resources Information Center

    Malcolm, Cliff; Welch, Wayne

    To provide a real life example of case study methodology for educational evaluation, a naturalistic study of a Catholic junior college in Minneapolis, Minnesota is presented. Conducted as part of the ongoing evaluation of a federally supported project, the study provides an external observer's descriptive portrayal of the school, plus the…

  12. [Vasculitic urticaria: study of 12 cases].

    PubMed

    Hassan, M L; Perez Cejudo, J A; Yachi del Pino, E; Schroh, R G

    1990-01-01

    Twelve cases of chronic urticaria with histopathologic features of lecocitoclastic allergic angitis are studied. The type of cutaneous lesion, personal and familiar atopic history and the presence of autoimmune disease are described. Light microscopy, direct immunofluorescence, anti DNA, antinuclear, antithyroid, Ro, La, Rnp and Sm antibodies, total complement levels, C3 and C4, rheumatoid factor, latex, ASTO, cryoglobulines and complete workup were investigated, taking into account natural progression and response to therapy. Two different groups are defined: 1) normocomplementemic (5 patients) and 2) hypocomplementemic (7 patients). They were all women except one. The cutaneous lesions were indistinguishable in the two groups. Only in the second group there was an associated disease (systemic lupus erythematosus, Sjogren syndrome disease, lupus-Sjogren overlap, autoimmune thyroid disease). Urticaria had been present from the onset of the disease in 4 patients, and occurred later during its course in 8 others. Five patients had thyroid disease (Hashimoto thyroiditis or Graves disease), two of them being mother and daughter. Another patient had a family history of Grave's disease and urticaria. Anti DNA antibodies were found in 7 cases, and anti Ro + La + in 3 cases. Response to treatment was variable with spontaneous cycles of worsening and remissions. One of the patients found a relationship with certain foods. Histopathologic results are related in both clinical normocomplementemic and hypocomplementemic groups. No significant differences were found between the two groups, but Ro+ and La+ patients exhibit more intense cariorexis and neutrophilic infiltrates. PMID:2263094

  13. Two gimbal bearing case studies: Some lessons learned

    NASA Technical Reports Server (NTRS)

    Loewenthal, Stuart H.

    1988-01-01

    Two troublesome, torque related problems associated with gimbal actuators are discussed. Large, thin section angular contact bearings can have a surprisingly high torque sensitivity to radial thermal gradients. A predictive thermal-mechanical bearing analysis, as described, was helpful in establishing a safe temperature operating envelope. In the second example, end-of-travel torque limits of an oscillatory gimbal bearing appoached motor stall during limit cycling life tests. Bearing modifications required to restore acceptable torque performance are described. The lessons learned from these case studies should benefit designers of precision gimbals where singular bearing torque related problems are not uncommon.

  14. Data Analytics Under Deployed Conditions: A Case Study.

    PubMed

    Mellott, Mark D; Bonica, Mark J; Mapes, Matthew J

    2015-01-01

    Like their colleagues in fixed facilities, healthcare planners operating in a combat environment face the problem of transforming data into actionable information. Not all data is useful for decision-making and not all data comes neatly packaged. In this case study, the authors present an effort to collect and analyze data about forward surgical team utilization. The article shares the variety of data collected and the process of analysis, and concludes with a recommended process for data analysis in the field. PMID:26606410

  15. On the resolvent of multidimensional operators with frequently changing boundary conditions in the case of the homogenized Dirichlet condition

    SciTech Connect

    Sharapov, T F

    2014-10-31

    We consider an elliptic operator in a multidimensional domain with frequently changing boundary conditions in the case when the homogenized operator contains the Dirichlet boundary condition. We prove the uniform resolvent convergence of the perturbed operator to the homogenized operator and obtain estimates for the rate of convergence. A complete asymptotic expansion is constructed for the resolvent when it acts on sufficiently smooth functions. Bibliography: 41 titles.

  16. Orbital transfer vehicle launch operations study. Volume 1: Executive summary

    NASA Technical Reports Server (NTRS)

    1986-01-01

    The purpose was to use the operational experience at the launch site to identify, describe and quantify the operational impacts of the various configurations on the Kennedy Space Center (KSC) and/or space station launch sites. Orbital Transfer Vehicle (OTV) configurations are being developed/defined by contractor teams. Lacking an approved configuration, the KSC Study Team defined a Reference Configuration to be used for this study. This configuration then become the baseline for the identification of the facilities, personnel and crew skills required for processing the OTV in a realistic manner that would help NASA achieve the lowest possible OTV life cycle costs. As the study progressed, researchers' initial apraisal that the vehicle, when delivered, would be a sophisticated, state-of-the-art vehicle was reinforced. It would be recovered and reused many times so the primary savings to be gained would be in the recurring-cycle of the vehicle operations--even to the point where it would be beneficial to break from tradition and make a significant expenditure in the development of processing facilities at the beginning of the program.

  17. [Psychoses and epilepsy. A case study].

    PubMed

    Verhoeven, W M A; Gunning, W B; Tuerlings, J H A M; Egger, J I M; Tuinier, S

    2006-01-01

    Over the last few decades much research has been done into the raised level of psychiatric comorbidity in epilepsy. On the basis of a case study of a patient suffering from post-ictal psychoses we explain the psychiatric differential diagnosis within the framework of epilepsy and we investigate the frequent psychiatric side-effects of anticonvulsants. It is concluded that the links between epilepsy and psychiatric symptoms are complex and that the neuropsychiatry of epilepsy is concerned with syndromes that are unique and do notfit into modern psychiatric classification systems. PMID:17086946

  18. Reinforcement learning: Solving two case studies

    NASA Astrophysics Data System (ADS)

    Duarte, Ana Filipa; Silva, Pedro; dos Santos, Cristina Peixoto

    2012-09-01

    Reinforcement Learning algorithms offer interesting features for the control of autonomous systems, such as the ability to learn from direct interaction with the environment, and the use of a simple reward signalas opposed to the input-outputs pairsused in classic supervised learning. The reward signal indicates the success of failure of the actions executed by the agent in the environment. In this work, are described RL algorithmsapplied to two case studies: the Crawler robot and the widely known inverted pendulum. We explore RL capabilities to autonomously learn a basic locomotion pattern in the Crawler, andapproach the balancing problem of biped locomotion using the inverted pendulum.

  19. Wind to Hydrogen in California: Case Study

    SciTech Connect

    Antonia, O.; Saur, G.

    2012-08-01

    This analysis presents a case study in California for a large scale, standalone wind electrolysis site. This is a techno-economic analysis of the 40,000 kg/day renewable production of hydrogen and subsequent delivery by truck to a fueling station in the Los Angeles area. This quantity of hydrogen represents about 1% vehicle market penetration for a city such as Los Angeles (assuming 0.62 kg/day/vehicle and 0.69 vehicles/person) [8]. A wind site near the Mojave Desert was selected for proximity to the LA area where hydrogen refueling stations are already built.

  20. Metrology in Pharmaceutical Industry - A Case Study

    NASA Astrophysics Data System (ADS)

    Yuvamoto, Priscila D.; Fermam, Ricardo K. S.; Nascimento, Elizabeth S.

    2016-07-01

    Metrology is recognized by improving production process, increasing the productivity, giving more reliability to the measurements and consequently, it impacts in the economy of a country. Pharmaceutical area developed GMP (Good Manufacture Practice) requeriments, with no introduction of metrological concepts. However, due to Nanomedicines, it is expected this approach and the consequent positive results. The aim of this work is to verify the level of metrology implementation in a Brazilian pharmaceutical industry, using a case study. The purpose is a better mutual comprehension by both areas, acting together and governmental support to robustness of Brazilian pharmaceutical area.

  1. Open-Source as a strategy for operational software - the case of Enki

    NASA Astrophysics Data System (ADS)

    Kolberg, Sjur; Bruland, Oddbjørn

    2014-05-01

    Since 2002, SINTEF Energy has been developing what is now known as the Enki modelling system. This development has been financed by Norway's largest hydropower producer Statkraft, motivated by a desire for distributed hydrological models in operational use. As the owner of the source code, Statkraft has recently decided on Open Source as a strategy for further development, and for migration from an R&D context to operational use. A current cooperation project is currently carried out between SINTEF Energy, 7 large Norwegian hydropower producers including Statkraft, three universities and one software company. Of course, the most immediate task is that of software maturing. A more important challenge, however, is one of gaining experience within the operational hydropower industry. A transition from lumped to distributed models is likely to also require revision of measurement program, calibration strategy, use of GIS and modern data sources like weather radar and satellite imagery. On the other hand, map based visualisations enable a richer information exchange between hydrologic forecasters and power market traders. The operating context of a distributed hydrology model within hydropower planning is far from settled. Being both a modelling framework and a library of plugin-routines to build models from, Enki supports the flexibility needed in this situation. Recent development has separated the core from the user interface, paving the way for a scripting API, cross-platform compilation, and front-end programs serving different degrees of flexibility, robustness and security. The open source strategy invites anyone to use Enki and to develop and contribute new modules. Once tested, the same modules are available for the operational versions of the program. A core challenge is to offer rigid testing procedures and mechanisms to reject routines in an operational setting, without limiting the experimentation with new modules. The Open Source strategy also has

  2. Lunar Transportation Facilities and Operations Study, option 2

    NASA Technical Reports Server (NTRS)

    1992-01-01

    During the Option 2 period of the Lunar Transportation Facilities and Operations Study (LTFOS), a joint McDonnell Douglas Space Systems Company Kennedy Space Center (MDSSC-KSC) and National Aeronautics and Space Administration Kennedy Space Center (NASA-KSC) Study team conducted a comparison of the functional testing of the RL-10 and Space Shuttle Main Engine, a quick-look impact assessment of the Synthesis Group Report, and a detailed assessment of the Synthesis Group Report. The results of these KSC LTFOS team efforts are included. The most recent study task effort was a detailed assessment of the Synthesis Group Report. The assessment was conducted to determine the impact on planetary launch and landing facilities and operations. The result of that effort is a report entitled 'Analysis of the Synthesis Group Report, its Architectures and their Impacts on PSS Launch and Landing Operations' and is contained in Appendix A. The report is structured in a briefing format with facing pages as opposed to a narrative style. A quick-look assessment of the Synthesis Group Report was conducted to determine the impact of implementing the recommendations of the Synthesis Group on KSC launch facilities and operations. The data was documented in a presentation format as requested by Kennedy Space Center Technology and Advanced Projects Office and is included in Appendix B. Appendix C is a white paper on the comparison of the functional testing of the RL-10 and Space Shuttle Main Engine. The comparison was undertaken to provide insight regarding common test requirements that would be applicable to Lunar and Mars Excursion Vehicles (LEV and MEV).

  3. International cooperative study of aircrew layover sleep Operational summary

    NASA Technical Reports Server (NTRS)

    Graeber, R. Curtis; Dement, William C.; Nicholson, Anthony N.; Sasaki, Mitsuo; Wegmann, Hans M.

    1986-01-01

    The findings of this cooperative study of layover sleep have direct implications for flight operations. In the consensus view of the principal investigators, these can be divided into their relevance for eastward or westward flight. Eastward flight produced more sleep disruption than westward. Different sleep and scheduling strategies are recommended for each flight direction, and the importance of individual crewmember factors is discussed in relation to age and circadian type. Despite the limitations of this study with regard to trip simplicity and the baseline data, the results for each airline are highly consistent and should be applicable to a wide range of long-haul crewmembers and carriers.

  4. Cross-cultural issues in infanticide: a case study.

    PubMed

    Kunst, J L; Reed, M

    1999-05-01

    This article examines the case of a Mexican American woman who was found not guilty by reason of insanity for infanticide, the murder of her young son. A detailed case history is presented with a focus on cultural issues as they affect this woman's family dynamics, assimilation and acculturation, emotionality, spirituality, and seeking of mental health treatment. In addition, a theoretical conceptualization is presented, identifying the psychodynamic operations that laid the foundation for the crime, including the normal process of identity development and the mitigating factors of gender, culture, and psychopathology. The study explores the important influences of culture in the commission of this crime as well as in subsequent treatment, highlighting the changes in society and mental health treatment that need to be made to reduce the incidence of such family violence. PMID:15605684

  5. The Effect of Using Case Studies in Business Statistics

    ERIC Educational Resources Information Center

    Pariseau, Susan E.; Kezim, Boualem

    2007-01-01

    The authors evaluated the effect on learning of using case studies in business statistics courses. The authors divided students into 3 groups: a control group, a group that completed 1 case study, and a group that completed 3 case studies. Results evidenced that, on average, students whom the authors required to complete a case analysis received…

  6. Building Explanations across Case Studies: A Framework for Synthesis.

    ERIC Educational Resources Information Center

    Rossman, Gretchen B.

    A framework is offered for fostering systematic, creative synthesis across various case studies. The challenge for those seeking to synthesize from case studies is to develop respect for the individual case context while permitting some blurring of unique features to occur in the synthesis. Case studies are meant to render an account of specific…

  7. Airborne Precision Spacing for Dependent Parallel Operations Interface Study

    NASA Technical Reports Server (NTRS)

    Volk, Paul M.; Takallu, M. A.; Hoffler, Keith D.; Weiser, Jarold; Turner, Dexter

    2012-01-01

    This paper describes a usability study of proposed cockpit interfaces to support Airborne Precision Spacing (APS) operations for aircraft performing dependent parallel approaches (DPA). NASA has proposed an airborne system called Pair Dependent Speed (PDS) which uses their Airborne Spacing for Terminal Arrival Routes (ASTAR) algorithm to manage spacing intervals. Interface elements were designed to facilitate the input of APS-DPA spacing parameters to ASTAR, and to convey PDS system information to the crew deemed necessary and/or helpful to conduct the operation, including: target speed, guidance mode, target aircraft depiction, and spacing trend indication. In the study, subject pilots observed recorded simulations using the proposed interface elements in which the ownship managed assigned spacing intervals from two other arriving aircraft. Simulations were recorded using the Aircraft Simulation for Traffic Operations Research (ASTOR) platform, a medium-fidelity simulator based on a modern Boeing commercial glass cockpit. Various combinations of the interface elements were presented to subject pilots, and feedback was collected via structured questionnaires. The results of subject pilot evaluations show that the proposed design elements were acceptable, and that preferable combinations exist within this set of elements. The results also point to potential improvements to be considered for implementation in future experiments.

  8. Formal Methods Case Studies for DO-333

    NASA Technical Reports Server (NTRS)

    Cofer, Darren; Miller, Steven P.

    2014-01-01

    RTCA DO-333, Formal Methods Supplement to DO-178C and DO-278A provides guidance for software developers wishing to use formal methods in the certification of airborne systems and air traffic management systems. The supplement identifies the modifications and additions to DO-178C and DO-278A objectives, activities, and software life cycle data that should be addressed when formal methods are used as part of the software development process. This report presents three case studies describing the use of different classes of formal methods to satisfy certification objectives for a common avionics example - a dual-channel Flight Guidance System. The three case studies illustrate the use of theorem proving, model checking, and abstract interpretation. The material presented is not intended to represent a complete certification effort. Rather, the purpose is to illustrate how formal methods can be used in a realistic avionics software development project, with a focus on the evidence produced that could be used to satisfy the verification objectives found in Section 6 of DO-178C.

  9. Case Study of the California Cement Industry

    SciTech Connect

    Coito, Fred; Powell, Frank; Worrell, Ernst; Price, Lynn; Friedmann, Rafael

    2005-05-01

    California is the largest cement producing state in theU.S., accounting for between 10 percent and 15 percent of U.S. cementproduction and cement industry employment. The cement industry inCalifornia consists of 31 sites that consume large amounts of energy,annually: 1,600 GWh of electricity, 22 million therms of natural gas, 2.3million tons of coal, 0.25 tons of coke, and smaller amounts of wastematerials, including tires. The case study summarized in this paperfocused on providing background information, an assessment ofenergy-efficiency opportunities and barriers, and program recommendationsthat can be used by program planners to better target products to thecement industry. The primary approach to this case study involvedwalk-through surveys of customer facilities and in depth interviews withcustomer decision makers and subsequent analysis of collected data. Inaddition, a basic review of the cement production process was developed,and summary cement industry energy and economic data were collected, andanalyzed. The analysis of secondary data provides background informationon the cement industry and identification of potential energy-efficiencyopportunities. The interviews provide some understanding of the customerperspective about implementation of energy-efficiencyprojects.

  10. Feasibility study for a transportation operations system cask maintenance facility

    SciTech Connect

    Rennich, M.J.; Medley, L.G.; Attaway, C.R.

    1991-01-01

    The US Department of Energy (DOE), Office of Civilian Radioactive Waste Management (OCRWM) is responsible for the development of a waste management program for the disposition of spent nuclear fuel (SNF) and high-level waste (HLW). The program will include a transportation system for moving the nuclear waste from the sources to a geologic repository for permanent disposal. Specially designed casks will be used to safely transport the waste. The cask systems must be operated within limits imposed by DOE, the Nuclear Regulatory Commission (NRC), and the Department of Transportation (DOT). A dedicated facility for inspecting, testing, and maintaining the cask systems was recommended by the General Accounting Office (in 1979) as the best means of assuring their operational effectiveness and safety, as well as regulatory compliance. In November of 1987, OCRWM requested a feasibility study be made of a Cask Maintenance Facility (CMF) that would perform the required functions. 46 refs., 16 figs., 13 tabs.

  11. Proximity Operations Nano-Satellite Flight Demonstration (PONSFD) Rendezvous Proximity Operations Design and Trade Studies

    NASA Astrophysics Data System (ADS)

    Griesbach, J.; Westphal, J. J.; Roscoe, C.; Hawes, D. R.; Carrico, J. P.

    2013-09-01

    The Proximity Operations Nano-Satellite Flight Demonstration (PONSFD) program is to demonstrate rendezvous proximity operations (RPO), formation flying, and docking with a pair of 3U CubeSats. The program is sponsored by NASA Ames via the Office of the Chief Technologist (OCT) in support of its Small Spacecraft Technology Program (SSTP). The goal of the mission is to demonstrate complex RPO and docking operations with a pair of low-cost 3U CubeSat satellites using passive navigation sensors. The program encompasses the entire system evolution including system design, acquisition, satellite construction, launch, mission operations, and final disposal. The satellite is scheduled for launch in Fall 2015 with a 1-year mission lifetime. This paper provides a brief mission overview but will then focus on the current design and driving trade study results for the RPO mission specific processor and relevant ground software. The current design involves multiple on-board processors, each specifically tasked with providing mission critical capabilities. These capabilities range from attitude determination and control to image processing. The RPO system processor is responsible for absolute and relative navigation, maneuver planning, attitude commanding, and abort monitoring for mission safety. A low power processor running a Linux operating system has been selected for implementation. Navigation is one of the RPO processor's key tasks. This entails processing data obtained from the on-board GPS unit as well as the on-board imaging sensors. To do this, Kalman filters will be hosted on the processor to ingest and process measurements for maintenance of position and velocity estimates with associated uncertainties. While each satellite carries a GPS unit, it will be used sparsely to conserve power. As such, absolute navigation will mainly consist of propagating past known states, and relative navigation will be considered to be of greater importance. For relative observations

  12. Promoting Inter-Professional Teamwork and Learning--The Case of a Surgical Operating Theatre

    ERIC Educational Resources Information Center

    Collin, Kaija; Paloniemi, Susanna; Mecklin, Jukka-Pekka

    2010-01-01

    Hospitals, and surgical operating theatres (OTs) in particular, are environments in which inter-professional teamwork and learning are essential to secure patient safety and effective practice. However, it has been revealed in many studies that inter-professional collaborative work in hospital organisations faces many challenges and constraints.…

  13. Review article: review of behavioral operations experimental studies of newsvendor problems for operating room management.

    PubMed

    Wachtel, Ruth E; Dexter, Franklin

    2010-06-01

    Operating room (OR) managers must plan staffing in the face of uncertain demand for OR time. Planning too much staffing results in underutilized OR time. Planning too little staffing causes overutilized time, which is approximately twice as expensive as underutilized time. Deciding how much staffing to plan for an OR is analogous to the classic newsvendor problem in operations research. A newsvendor must decide how much product to order based on its cost c and sales price p, plus estimates of the uncertain future demand for the product. The newsvendor problem has a simple mathematical solution. The correct amount of product to order is the (p - c)/p quantile of the demand for the product. This optimal order quantity is analogous mathematically to the number of hours of OR time for which staffing should be planned. We performed a systematic review of the behavioral operations experimental literature on newsvendor problems relevant to OR management. Student volunteers participating in experimental studies have great difficulty knowing how much product to order, given c, p, and the demand distribution. Decision making is only modestly improved by more frequent feedback. Even scores of rounds of ordering are insufficient for much learning to occur. Suboptimal decisions result from innate psychological biases. Students anchor on mean demand, make insufficient adjustments, and rely disproportionately on the most recent demand values. The behavior of OR managers who plan staffing for the OR is analogous to that of students participating in a newsvendor experiment. Month after month, an OR manager will plan too little staffing for the surgeon who consistently ends the day late and too much staffing for the surgeon who consistently does not fill an OR. Experimental studies of the newsvendor problem provide mechanistic insights into the reasons that OR managers make poor decisions when planning OR staffing. The students face no organizational factors or personality issues

  14. Making intelligent systems team players: Additional case studies

    NASA Technical Reports Server (NTRS)

    Malin, Jane T.; Schreckenghost, Debra L.; Rhoads, Ron W.

    1993-01-01

    Observations from a case study of intelligent systems are reported as part of a multi-year interdisciplinary effort to provide guidance and assistance for designers of intelligent systems and their user interfaces. A series of studies were conducted to investigate issues in designing intelligent fault management systems in aerospace applications for effective human-computer interaction. The results of the initial study are documented in two NASA technical memoranda: TM 104738 Making Intelligent Systems Team Players: Case Studies and Design Issues, Volumes 1 and 2; and TM 104751, Making Intelligent Systems Team Players: Overview for Designers. The objective of this additional study was to broaden the investigation of human-computer interaction design issues beyond the focus on monitoring and fault detection in the initial study. The results of this second study are documented which is intended as a supplement to the original design guidance documents. These results should be of interest to designers of intelligent systems for use in real-time operations, and to researchers in the areas of human-computer interaction and artificial intelligence.

  15. 13 CFR 120.839 - Case-by-case application to make a 504 loan outside of a CDC's Area of Operations.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    .... The CDC's Risk Rating, among other factors, will be considered in determining satisfactory SBA... 13 Business Credit and Assistance 1 2010-01-01 2010-01-01 false Case-by-case application to make a 504 loan outside of a CDC's Area of Operations. 120.839 Section 120.839 Business Credit and...

  16. Deconstructing the "July Effect" in Operative Outcomes: A National Study.

    PubMed

    Watkins, Ammara A; Bliss, Lindsay A; Cameron, Danielle B; Tseng, Jennifer F; Kent, Tara S

    2016-05-01

    This study analyzes the relationship between hospital teaching status, failure to rescue, and time of year in select gastrointestinal operations. Procedure codes for laparoscopic cholecystectomy, colectomy, and pancreatectomy were queried from the Nationwide Inpatient Sample (2004-2011). Failure to rescue was defined as inpatient mortality when ≥1 complication. A total of 2,777,267 laparoscopic cholecystectomies, 2,519,903 colectomies, and 129,619 pancreatectomies were performed. Teaching hospitals had increased overall rates of failure to rescue compared to non-teaching hospitals, 10.0 vs. 9.5 % (p = 0.0187), particularly between May and August. There was greater inter-month variability in non-teaching hospitals amongst individual operations. On multivariable analysis, July was not predictive of increased odds of failure to rescue. Teaching status, hospital characteristics, and patient demographics were associated with increased odds of failure to rescue. Although teaching hospitals have a higher overall failure to rescue rate amongst the selected gastrointestinal operations, odds of failure to rescue are not increased in the month of July. Non-teaching hospitals tend to exhibit more monthly variation in failure to rescue rates, and hospital/patient demographics are predictive of failure to rescue. Further investigation targeted at identifying drivers of temporal variation is warranted to optimize patient outcomes. PMID:26932502

  17. Microgravity isolation system design: A case study

    NASA Technical Reports Server (NTRS)

    Hampton, R. D.; Knospe, C. R.; Allaire, P. E.; Grodsinsky, C. M.

    1994-01-01

    Many acceleration-sensitive, microgravity science experiments will require active vibration isolation from manned orbiters on which they will be mounted. The isolation problem, especially in the case of a tethered payload, is a complex three-dimensional one that is best suited to modern-control design methods. In this paper, extended H(sub 2) synthesis is used to design an active isolator (i.e., controller) for a realistic single-input-multiple-output (SIMO) microgravity vibration isolation problem. Complex mu-analysis methods are used to analyze the isolation system with respect to sensor, actuator, and umbilical uncertainties. The paper fully discusses the design process employed and the insights gained. This design case study provides a practical approach for isolation problems of greater complexity. Issues addressed include a physically intuitive state-space description of the system, disturbance and noise filters, filters for frequency weighting, and uncertainty models. The controlled system satisfies all the performance specifications and is robust with respect to model uncertainties.

  18. Continuity of operations planning in college athletic programs: The case for incorporating Federal Emergency Management Guidelines.

    PubMed

    Hall, Stacey A; Allen, Brandon L; Phillips, Dennis

    2016-01-01

    College athletic departments have a responsibility to provide a safe environment for student-athletes; however, most colleges do not have a crisis management plan that includes procedures for displaced student-athletes or alternate facilities to perform athletic events. Continuity of operations planning ensures athletic programs are equipped to maintain essential functions during, or shortly after, a disruption of operations due to possible hazards. Previous studies have identified a lack of emergency preparedness and continuity planning in college athletic departments. The purpose of this article is to illustrate in detail one approach to disaster planning for college athletic departments, namely the Federal Emergency Management Agency (FEMA) continuity of operations framework. By adhering to FEMA guidelines and promoting a best practices model, athletic programs can effectively plan to address potential hazards, as well as protect the organization's brand, image, and financial sustainability after a crisis event. PMID:26963231

  19. Heterogeneous distributed databases: A case study

    NASA Technical Reports Server (NTRS)

    Stewart, Tracy R.; Mukkamala, Ravi

    1991-01-01

    Alternatives are reviewed for accessing distributed heterogeneous databases and a recommended solution is proposed. The current study is limited to the Automated Information Systems Center at the Naval Sea Combat Systems Engineering Station at Norfolk, VA. This center maintains two databases located on Digital Equipment Corporation's VAX computers running under the VMS operating system. The first data base, ICMS, resides on a VAX11/780 and has been implemented using VAX DBMS, a CODASYL based system. The second database, CSA, resides on a VAX 6460 and has been implemented using the ORACLE relational database management system (RDBMS). Both databases are used for configuration management within the U.S. Navy. Different customer bases are supported by each database. ICMS tracks U.S. Navy ships and major systems (anti-sub, sonar, etc.). Even though the major systems on ships and submarines have totally different functions, some of the equipment within the major systems are common to both ships and submarines.

  20. Operability assessment in CTEPH: Lessons from the CHEST-1 study.

    PubMed

    Jenkins, David P; Biederman, Andrzej; D'Armini, Andrea M; Dartevelle, Philippe G; Gan, Hui-Li; Klepetko, Walter; Lindner, Jaroslav; Mayer, Eckhard; Madani, Michael M

    2016-09-01

    Pulmonary endarterectomy is the gold standard treatment for chronic thromboembolic pulmonary hypertension and is potentially curative, although some patients are unsuitable for pulmonary endarterectomy and require alternative management. Lack of standardized assessment of pulmonary endarterectomy eligibility risks suboptimal treatment in some patients. We discuss the implications for future clinical trials and practice of a unique operability assessment in patients who have chronic thromboembolic pulmonary hypertension and were initially screened for inclusion in the CHEST-1 (Chronic Thromboembolic Pulmonary Hypertension Soluble Guanylate Cyclase Stimulator Trial-1) study. The CHEST-1 study evaluated riociguat for the treatment of inoperable chronic thromboembolic pulmonary hypertension (CTEPH) or persistent/recurrent pulmonary hypertension after pulmonary endarterectomy. Screened patients who were initially considered "inoperable" underwent central independent adjudication by a committee of experienced surgeons, or local adjudication in collaboration with an experienced surgeon. Operability decisions were based on accessibility of thrombi and the association between pulmonary vascular resistance (PVR) and the extent of obstruction, using pulmonary angiography/computed tomography with ventilation/perfusion scintigraphy as the minimum diagnostic tests. Of 446 patients screened for CHEST-1, a total of 188 and 124 underwent central and local adjudication, respectively, after being initially considered to be "inoperable." After a second assessment by an experienced surgeon, 69 of these 312 "inoperable" patients were deemed operable. Rigorous measures in CHEST-1 guaranteed that only technically inoperable patients, or patients who had persistent/recurrent pulmonary hypertension, were enrolled, thus ensuring that only patients for whom surgery was not an option were enrolled. This study design sets new standards for future clinical trials and practice in CTEPH, helping