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1

Parallel processing in knowledge-based diagnostic systems  

Microsoft Academic Search

This paper highlights the use of the parallel processing concept in knowledge-based diagnostic systems. A MIMD machine connected in a cubic mesh fashion using Parlog has been suggested to implement such systems. An algorithm supporting the concurrent execution of multiple conflict set rules of the same production system program is presented. A specific application to communication systems maintenance utilizing these

Mukhtar Hussain; Jatinder Singh Bedi

1990-01-01

2

Development of the Diagnostic Expert System for Tea Processing  

NASA Astrophysics Data System (ADS)

A diagnostic expert system for tea processing which can presume the cause of the defect of the processed tea was developed to contribute to the improvement of tea processing. This system that consists of some programs can be used through the Internet. The inference engine, the core of the system adopts production system which is well used on artificial intelligence, and is coded by Prolog as the artificial intelligence oriented language. At present, 176 rules for inference have been registered on this system. The system will be able to presume better if more rules are added to the system.

Yoshitomi, Hitoshi; Yamaguchi, Yuichi

3

An integrated diagnostic system for a process controller  

SciTech Connect

The Oak Ridge National Laboratory Instrumentation and Controls Division is developing an integrated diagnostic system to aid a technician in diagnosing faults in a complex process controller. The integrated diagnostic system, which is being developed to run on 80386 machines in the Smalltalk language, will include an expert system to make a diagnosis, an on-line ''hypermedia'' manual (which includes equipment manuals and video) to supply additional help and reference material, and an automated procedure guide to take the technician through complex procedures for tasks such as parts replacement. 3 refs., 6 figs.

Mullens, J.A.; Williams, L.C.; Zabriskie, W.L.

1989-01-01

4

Development and Evaluation of a Diagnostic Documentation Support System using Knowledge Processing  

Microsoft Academic Search

In this paper, we will introduce a system which supports creating diagnostic reports. Diagnostic reports are documents by doctors of radiology describing the existence and nonexistence of abnormalities from the inspection images, such as CT and MRI, and summarize a patient's state and disease. Our system indicates insufficiencies in these reports created by younger doctors, by using knowledge processing based

Kyoko Makino; Rumi Hayakawa; Koichi Terai; Hiroshi Fukatsu

2008-01-01

5

Dual processing and diagnostic errors  

Microsoft Academic Search

In this paper, I review evidence from two theories in psychology relevant to diagnosis and diagnostic errors. “Dual Process”\\u000a theories of thinking, frequently mentioned with respect to diagnostic error, propose that categorization decisions can be\\u000a made with either a fast, unconscious, contextual process called System 1 or a slow, analytical, conscious, and conceptual\\u000a process, called System 2. Exemplar theories of

Geoff Norman

2009-01-01

6

Prodiag--a hybrid artificial intelligence based reactor diagnostic system for process faults  

SciTech Connect

Commonwealth Research Corporation (CRC) and Argonne National Laboratory (ANL) are collaborating on a DOE-sponsored Cooperative Research and Development Agreement (CRADA), project to perform feasibility studies on a novel approach to Artificial Intelligence (Al) based diagnostics for component faults in nuclear power plants. Investigations are being performed in the construction of a first-principles physics-based plant level process diagnostic expert system (ES) and the identification of component-level fault patterns through operating component characteristics using artificial neural networks (ANNs). The purpose of the proof-of-concept project is to develop a computer-based system using this Al approach to assist process plant operators during off-normal plant conditions. The proposed computer-based system will use thermal hydraulic (T-H) signals complemented by other non-T-H signals available in the data stream to provide the process operator with the component which most likely caused the observed process disturbance.To demonstrate the scale-up feasibility of the proposed diagnostic system it is being developed for use with the Chemical Volume Control System (CVCS) of a nuclear power plant. A full-scope operator training simulator representing the Commonwealth Edison Braidwood nuclear power plant is being used both as the source of development data and as the means to evaluate the advantages of the proposed diagnostic system. This is an ongoing multi-year project and this paper presents the results to date of the CRADA phase.

Reifman, J.; Wei, T.Y.C.; Vitela, J.E. [Argonne National Lab., IL (United States); Applequist, C. A. [Commonwealth Research Corp., Chicago, IL (United States); Chasensky, T.M. [Commonwealth Edison Co., Chicago, IL (United States)

1996-03-01

7

TEXTOR diagnostic data acquisition and processing in a distributed system environment  

SciTech Connect

A distributed computer system configuration is used at the KFA Julich TEXTOR Tokamak experiment for control and data acquisition of the diagnostic systems as well as for processing of the experimental data. A cluster of VAX computers, interconnected by CI and Ethernet, from the network. VAX/VMS and DECNET is the base for the communication within the network. Interfacing to the process instrumentation is done through CAMAC. High data volumes are acquired, processed and maintained. This paper gives a description of the TEXTOR data acquisition system structure, performance and present status of implementation. The distributed nature of the system will by outlined.

Korten, M.; Becks, B.; Klein, R. (Inst. fuer Plasmaphysik des Forschungszentrums Julich GmbH, Association Euratom-KFA, P.O. Box 1913, D-5170 Julich (DE))

1992-04-01

8

Diagnostic Systems  

Microsoft Academic Search

\\u000a Diagnosis and epidemiology are core topics in psychiatry and developmental medicine. There can be no clinical medical work\\u000a without diagnosis. There can be no medical epidemiological study of psychiatric disorder without a consideration of diagnostic\\u000a boundaries.

Christopher L. Gillberg

9

Image processing and computer controls for video profile diagnostic system in the ground test accelerator (GTA)  

SciTech Connect

This paper describes the application of video image processing to beam profile measurements on the Ground Test Accelerator (GTA). A diagnostic was needed to measure beam profiles in the intermediate matching section (IMS) between the radio-frequency quadrupole (RFQ) and the drift tube linac (DTL). Beam profiles are measured by injecting puffs of gas into the beam. The light emitted from the beam-gas interaction is captured and processed by a video image processing system, generating the beam profile data. A general purpose, modular and flexible video image processing system, imagetool, was used for the GTA image profile measurement. The development of both software and hardware for imagetool and its integration with the GTA control system (GTACS) will be discussed. The software includes specialized algorithms for analyzing data and calibrating the system. The underlying design philosophy of imagetool was tested by the experience of building and using the system, pointing the way for future improvements. The current status of the system will be illustrated by samples of experimental data.

Wright, R.M.; Zander, M.E.; Brown, S.K.; Sandoval, D.P.; Gilpatrick, J.D.; Gibson, H.E.

1992-09-01

10

Image processing and computer controls for video profile diagnostic system in the ground test accelerator (GTA)  

SciTech Connect

This paper describes the application of video image processing to beam profile measurements on the Ground Test Accelerator (GTA). A diagnostic was needed to measure beam profiles in the intermediate matching section (IMS) between the radio-frequency quadrupole (RFQ) and the drift tube linac (DTL). Beam profiles are measured by injecting puffs of gas into the beam. The light emitted from the beam-gas interaction is captured and processed by a video image processing system, generating the beam profile data. A general purpose, modular and flexible video image processing system, imagetool, was used for the GTA image profile measurement. The development of both software and hardware for imagetool and its integration with the GTA control system (GTACS) will be discussed. The software includes specialized algorithms for analyzing data and calibrating the system. The underlying design philosophy of imagetool was tested by the experience of building and using the system, pointing the way for future improvements. The current status of the system will be illustrated by samples of experimental data.

Wright, R.M.; Zander, M.E.; Brown, S.K.; Sandoval, D.P.; Gilpatrick, J.D.; Gibson, H.E.

1992-01-01

11

Picture archiving and communication systems (PACS) of dynamic image processing for cardiologic diagnostics of transportation workers  

NASA Astrophysics Data System (ADS)

Picture Archiving and Communication Systems (PACS) are the most perspective branch of medical technologies development. One of the most mass, cheap and effective methods of diagnostics and treatment of cardio-vascular diseases is interventional cardiology based on angiologic procedures. The principal difference of PACS for interventional cardiology is in necessity of gaining, analysis and archiving of dynamic images (angiology scenes). Russian Research Center <> has developed and successfully implemented the first Russian PACS for interventional cardiology - complex for diagnostics, monitoring and treatment of cardio-vascular disease <> which is described later in the article.

Gnedenko, Valeri G.; Ioseliani, D. G.; Nikiforov, S. N.; Fainberg, Evgeny M.

2002-04-01

12

Diagnostic monitoring system for power plant boilers  

Microsoft Academic Search

A passive, microcomputer based diagnostic monitoring system has been developed to continuously monitor thirty-two critical boiler state variables and to predict the root cause of abnormal behavior in the boiler processes and control system. The development of the diagnostic logic and algorithms are discussed and the system operation is illustrated by case studies. The predictive capability of the diagnostic system

M. D. Tucker; G. Y. Masada

1983-01-01

13

Diagnostic Radiology Information System Design.  

National Technical Information Service (NTIS)

The purpose of this, the first phase in the development of a Diagnostic Radiology Information System (DRIS), has been to identify areas of information processing problems as they occur in the practice of radiology, and then to design a system with general...

H. C. Jacobson, H. J. Barnhard, J. W. Nance

1970-01-01

14

Heterodyne laser diagnostic system  

DOEpatents

The heterodyne laser diagnostic system includes, in one embodiment, an average power pulsed laser optical spectrum analyzer for determining the average power of the pulsed laser. In another embodiment, the system includes a pulsed laser instantaneous optical frequency measurement for determining the instantaneous optical frequency of the pulsed laser.

Globig, Michael A. (Antioch, CA); Johnson, Michael A. (Pleasanton, CA); Wyeth, Richard W. (Livermore, CA)

1990-01-01

15

Nanoscale laser processing and diagnostics  

Microsoft Academic Search

The article summarizes research activities of the Laser Thermal Laboratory on pulsed nanosecond and femtosecond laser-based\\u000a processing of materials and diagnostics at the nanoscale using optical-near-field processing. Both apertureless and apertured\\u000a near-field probes can deliver highly confined irradiation at sufficiently high intensities to impart morphological and structural\\u000a changes in materials at the nanometric level. Processing examples include nanoscale selective subtractive

David Hwang; Sang-Gil Ryu; Nipun Misra; Hojeong Jeon; Costas P. Grigoropoulos

2009-01-01

16

Flexible human machine interface for process diagnostics  

SciTech Connect

A flexible human machine interface to design and display graphical and textual process diagnostic information is presented. The system operates on different computer hardware platforms, including PCs under MS Windows and UNIX Workstations under X-Windows, in a client-server architecture. The interface system is customized for specific process applications in a graphical user interface development environment by overlaying the image of the process piping and instrumentation diagram with display objects that are highlighted in color during diagnostic display. Customization of the system is presented for Commonwealth Edison`s Braidwood PWR Chemical and Volume Control System with transients simulated by a full-scale operator-training simulator and diagnosed by a computer-based system.

Reifman, J.; Graham, G.E.; Wei, T.Y.C. [Argonne National Lab., IL (United States); Brown, K.R.; Chin, R.Y. [ComEd Chicago, IL (United States)

1996-05-01

17

The Diagnostic Application of Brain Image Processing and Analysis System for Ischemic Stroke  

Microsoft Academic Search

The diffusion weighted image (DWI) technique is routinely used for diagnosis and treatment of early stroke due to its superior\\u000a performance, especially when compared with conventional magnetic resonance image (MRI) for detection of acute ischemic stroke.\\u000a Using DWI examination, this paper proposes an application of image processing in a computer-aided diagnosis system, which\\u000a can effectively calculate the volume size and

Tzyh-chyang Chang; Jiann-der Lee; Chung-hsien Huang; Tony Wu; Chi-jen Chen; Shwu-jiuan Wu

2006-01-01

18

TMX-U diagnostic system  

SciTech Connect

Using data from the TMX-U diagnostic system, the production of sloshing ions has already been verified and the formation of electron thermal barriers is presently being investigated on the Tandem Mirror Experiment-Upgrade (TMX-U) at Lawrence Livermore National Laboratory. The TMX-U diagnostics are made up of the earlier TMX complement of diagnostics that determine confinement, microstability, and low-frequency stability, plus diagnostic instrumentation that measures electron parameters associated with mirror-confined electrons. This paper describes the three subsystems within the TMX-U diagnostic system: (1) the diagnostic facility (shot leader console, data cable system, and diagnostic timing system); (2) the individual diagnostic instruments that measure plasma and machine parameters; and (3) the data-acquisition and -analysis computer.

Correll, D.L.

1983-09-02

19

Knowledge-based very large scale integration (VLSI) process diagnostic system  

Microsoft Academic Search

One of the most critical issues facing the semiconductor industry is process testing and evaluation. Correcting marginal or faulty processes quickly is essential to maintaining yield and throughput. Simulation, statistical process control, and final circuit electrical tests are the most common methods of approaching the testing and evaluation problem. Statistical process control techniques are used to monitor critical parameters at

Michael E. Parten; M. Kittappa; F. R. Zapata

1994-01-01

20

Incorporating on-line process data into a diagnostic knowledge-based system  

E-print Network

and range charts were used as control charts. Autocorrelation analysis was used to determine data correlation. The expert system developed in this project has proven beneficial in documenting and preserving knowledge relating to gypsum wallboard...

Lin, Kai Hsuan

2012-06-07

21

Diagnostic Tools for HVOF Process Optimization.  

National Technical Information Service (NTIS)

The aim of this work was to show the workability of diagnostic tools in the HVOF process. The focus was on first order process mapping, including on-line diagnostics and single splat studies. Nanocrystalline alumina composites and quasicrystals were selec...

E. Turunen

2005-01-01

22

ADHD Subtypes and Co-Occurring Anxiety, Depression, and Oppositional-Defiant Disorder: Differences in Gordon Diagnostic System and Wechsler Working Memory and Processing Speed Index Scores  

ERIC Educational Resources Information Center

Objective: Wechsler Intelligence Scale for Children Freedom-from-Distractibility/Working Memory Index (FDI/WMI), Processing Speed Index (PSI), and Gordon Diagnostic System (GDS) scores in ADHD children were examined as a function of subtype and coexisting anxiety, depression, and oppositional-defiant disorder. Method: Participants were 587…

Mayes, Susan Dickerson; Calhoun, Susan L.; Chase, Gary A.; Mink, Danielle M.; Stagg, Ryan E.

2009-01-01

23

ADHD Subtypes and Co-Occurring Anxiety, Depression, and Oppositional-Defiant DisorderDifferences in Gordon Diagnostic System and Wechsler Working Memory and Processing Speed Index Scores  

Microsoft Academic Search

Objective: Wechsler Intelligence Scale for Children Freedom-from-Distractibility\\/Working Memory Index (FDI\\/WMI), Processing Speed Index (PSI), and Gordon Diagnostic System (GDS) scores in ADHD children were examined as a function of subtype and coexisting anxiety, depression, and oppositional-defiant disorder. Method: Participants were 587 children with ADHD combined type (alone, with oppositional-defiant disorder, and with anxiety or depression) and ADHD inattentive type (alone

Susan Dickerson Mayes; Susan L. Calhoun; Gary A. Chase; Danielle M. Mink; Ryan E. Stagg

2009-01-01

24

Diagnostic Prescriptive Reading System (DPRS).  

ERIC Educational Resources Information Center

The purpose of this diagnostic-prescriptive reading system (DPRS), proposed by Palm Beach County and the Florida Atlantic University and sponsored by the Florida Department of Education, was to provide classroom teachers with resources which would enable them to more effectively meet the individual reading needs of their students. This report…

Kuchinskas, Gloria

25

On-line diagnostic system for power generators  

SciTech Connect

A novel approach to diagnostics of a power generator is developed. It utilizes readily available data acquired by the existing computer-based monitoring/control system. Diagnostic procedures detect various trends in the generator data and interpret these trends in the generator data and interpret these trends as changes in the generator performance caused by incipient failures. Results of trend analyses, subjected to statistical validation, facilitate failure prediction and identification thus providing the justification for service when needed. The procedures are incorporated in a diagnostic system implemented in a PC interfaced with the existing VAX-based process monitoring and control system. The diagnostic system provides graphical display of the diagnostic messages.

Skormin, V.A. [Binghamton Univ., NY (United States). Watson School; Goodenough, G.S. [New York State Electric and Gas Corp., Binghamton, NY (United States); Huber, R.K. [Eastman Kodak Co., Rochester, NY (United States)

1996-12-31

26

Diagnostic-monitoring system for power-plant boilers  

Microsoft Academic Search

A passive, microcomputer based diagnostic-monitoring system has been developed to continuously monitor thirty-two critical-boiler-state variables and to predict the root cause of abnormal behavior in the boiler processes and control system. The development of the diagnostic logic and algorithms are discussed and the system operation is illustrated by case studies. The predictive capability of the diagnostic system is shown by

M. D. Tucker; G. Y. Masada

1983-01-01

27

Uses of diagnostic expert systems in clinical care.  

PubMed Central

The development and testing of computerized systems to assist in the diagnostic process is a time honored research activity in medical information science. The focus of the majority of the applications produced is on providing accurate diagnostic suggestions when appropriate clinical information is entered. We believe that diagnostic knowledge has a much wider range of uses than that of simply assigning diagnostic labels. Below we describe three applications which illustrate alternate uses for diagnostic systems. Applications that assist in data collection, assess the quality of medical reports, and extract relevant clinical data from natural language x-ray reports are discussed. We believe that more effort should be directed toward studying the use of diagnostic knowledge bases in processes that help plan diagnostic strategies, in quality assurance applications, and in processes that facilitate all aspects of medical communication. PMID:8130499

Haug, P. J.

1993-01-01

28

Flamedoctor™: Nonlinear Burner Diagnostic System  

NASA Astrophysics Data System (ADS)

Utility power plants are employing advanced control systems to improve performance over the load range. The performance of the boiler combustion system is critical to the overall performance. Flame Doctor™, which has been developed by McDermott Technology, Inc. and Oak Ridge National Laboratory under sponsorship of Electric Power Research Institute, performs diagnostics on an individual burner basis. The system consists of analogue-to-digital signal conversion and conditioning hardware, analysis software, and a graphical user interface. Time varying voltage signals from all of the burner flame scanners on a boiler are analyzed simultaneously. Nonlinear techniques such as symbolization and time asymmetry along with linear techniques such as power spectral analysis are used. The nonlinear techniques discriminate stability features in the combustion dynamics not possible with the linear techniques alone. The assessments for a variety of flame conditions are collected in a reference library. Libraries have been created for a number of flame scanners types. The Flame Doctor™ burner diagnostic system is described. Results from the first utility installation at Ameren UE Meramec power plant are shown. A live hook-up to the power plant is demonstrated. Flame Doctor™ is being offered commercially under alpha and beta demonstrations through the Electric Power Research Institute and Babcock & Wilcox.

Bailey, Ralph; Daw, Stuart; Finney, Charles; Flynn, Tom; Fuller, Tim

2003-08-01

29

SSME Post Test Diagnostic System: Systems Section  

NASA Technical Reports Server (NTRS)

An assessment of engine and component health is routinely made after each test firing or flight firing of a Space Shuttle Main Engine (SSME). Currently, this health assessment is done by teams of engineers who manually review sensor data, performance data, and engine and component operating histories. Based on review of information from these various sources, an evaluation is made as to the health of each component of the SSME and the preparedness of the engine for another test or flight. The objective of this project - the SSME Post Test Diagnostic System (PTDS) - is to develop a computer program which automates the analysis of test data from the SSME in order to detect and diagnose anomalies. This report primarily covers work on the Systems Section of the PTDS, which automates the analyses performed by the systems/performance group at the Propulsion Branch of NASA Marshall Space Flight Center (MSFC). This group is responsible for assessing the overall health and performance of the engine, and detecting and diagnosing anomalies which involve multiple components (other groups are responsible for analyzing the behavior of specific components). The PTDS utilizes several advanced software technologies to perform its analyses. Raw test data is analyzed using signal processing routines which detect features in the data, such as spikes, shifts, peaks, and drifts. Component analyses are performed by expert systems, which use 'rules-of-thumb' obtained from interviews with the MSFC data analysts to detect and diagnose anomalies. The systems analysis is performed using case-based reasoning. Results of all analyses are stored in a relational database and displayed via an X-window-based graphical user interface which provides ranked lists of anomalies and observations by engine component, along with supporting data plots for each.

Bickmore, Timothy

1995-01-01

30

Inertial navigation system intelligent diagnostic expert (INSIDE)  

Microsoft Academic Search

A troubleshooting expert system has been designed to provide repair and diagnostic information for aircraft inertial navigation systems (INS). The inertial navigation system intelligent diagnostic expert (INSIDE) is used to diagnose faults in an INS system, and to train new operators on the troubleshooting of an INS system, thus freeing up the experienced engineer for other projects. INSIDE leads a

L. Attias; J. Sveitis

1990-01-01

31

How community context affects entrepreneurial process: A diagnostic framework  

Microsoft Academic Search

This study reports a multi-faceted search to discover and articulate, in the form of a manageable framework, a diagnostic system for assessing the influence that community factors will have upon the conduct and outcome of any proposed entrepreneurial process. A methodological approach based on investigation of a rich empirical database supported by a wide examination of extant theory in several

Kevin Hindle

2010-01-01

32

Application of Process Management Tools for PCB Manufacturing and Diagnostics  

Microsoft Academic Search

This contribution presents the important steps of process management (PM) tools application for the printed circuits boards (PCB) manufacturing and diagnostics. The PM approach is a way of production and non-production activities management in manufacturing systems. The implementation of the approach represents the integration of knowledge from more areas of the science. The goal of PM application is improvement of

Jiri Tupa; Josef Basl; Vlastimil Skocil

2006-01-01

33

Controls and Diagnostics for Air Distribution Systems  

Microsoft Academic Search

Fault detection and diagnostics applied to heating, ventilating, and air-conditioning (HVAC) equipment has been an active area of research over the past decade, with much of the work focusing on air distribution systems. Concurrent efforts have sought to im-prove the control of these systems. This paper discusses the relationship between controls and diagnostics for air distribution systems, provides an overview

Leslie K. Norford; Kwangduk Douglas Lee

2003-01-01

34

The Diagnostic Process in Accounting Evaluation.  

ERIC Educational Resources Information Center

Presents ideas on developing a diagnostic accounting instrument, and answers the following questions: Are the diagnostic instruments given to accounting students measuring what they should measure? What advice can be given to students regarding questions that were missed? (CT)

Ruby, Ralph, Jr.; And Others

1981-01-01

35

Overcoming limitations of model-based diagnostic reasoning systems  

NASA Technical Reports Server (NTRS)

The development of a model-based diagnostic system to overcome the limitations of model-based reasoning systems is discussed. It is noted that model-based reasoning techniques can be used to analyze the failure behavior and diagnosability of system and circuit designs as part of the system process itself. One goal of current research is the development of a diagnostic algorithm which can reason efficiently about large numbers of diagnostic suspects and can handle both combinational and sequential circuits. A second goal is to address the model-creation problem by developing an approach for using design models to construct the GMODS model in an automated fashion.

Holtzblatt, Lester J.; Marcotte, Richard A.; Piazza, Richard L.

1989-01-01

36

Diagnostics and modeling of plasma processes  

SciTech Connect

The full exploitation of rf and dc glow discharges for microelectronic and photonic device fabrication, coherent and incoherent light sources, and high voltage switching will only be realized when they have reliable numerical models with which processes can be simulated. It is perhaps ironic that they can simulate device operation in great detail but must resort to trial and error development for device fabrication. This dichotomy is more remarkable when one realizes that the physics of semiconductor devices and plasma reactors are identical. Chemistry complicates the modeling of plasma reactors. This talk focuses on recent fluid models of discharge physics and in situ, non-intrusive diagnostic experiments designed to test these models. Specific examples related to diamond film growth and hydrogen-containing plasmas are highlighted as appropriate. Emphasis is placed on experimental and theoretical results for electric fields, ion densities, reactive atomic concentrations, and degrees of dissociation.

Gottscho, R.A. (AT and T Bell Labs., Murray Hill, NJ (USA))

1989-01-01

37

ADVANCED PROCESS MONITORING SYSTEMS FOR CONTINUOUS PROCESSES  

Microsoft Academic Search

The paper deals with a diagnostic and monitoring PC oriented system, based on a unique physical analysis of the process of continuous casting of steel, by utilization of static and dynamic measurements of the monitored process. The basis of the solution is application of an industrial computer with the ability of intranet monitoring of the solidification process in the mould

René Pyszko; Leopold Cudzik; Pavel Fojtík; Michal Adamik

38

Fuzzy fault diagnostic system based on fault tree analysis  

Microsoft Academic Search

A method is presented for process fault diagnosis using information from fault tree analysis and uncertainty\\/imprecision of data. Fault tree analysis, which has been used as a method of system reliability\\/safety analysis, provides a procedure for identifying failures within a process. A fuzzy fault diagnostic system is constructed which uses the fuzzy fault tree analysis to represent a knowledge of

Zong-Xiao Yang; Kazuhiko SUZUKI; Yukiyasu SHIMADA; Hayatoshi SAYAMA

1995-01-01

39

Qualitative model-based diagnostics for rocket systems  

NASA Technical Reports Server (NTRS)

A diagnostic software package is currently being developed at NASA LeRC that utilizes qualitative model-based reasoning techniques. These techniques can provide diagnostic information about the operational condition of the modeled rocket engine system or subsystem. The diagnostic package combines a qualitative model solver with a constraint suspension algorithm. The constraint suspension algorithm directs the solver's operation to provide valuable fault isolation information about the modeled system. A qualitative model of the Space Shuttle Main Engine's oxidizer supply components was generated. A diagnostic application based on this qualitative model was constructed to process four test cases: three numerical simulations and one actual test firing. The diagnostic tool's fault isolation output compared favorably with the input fault condition.

Maul, William; Meyer, Claudia; Jankovsky, Amy; Fulton, Christopher

1993-01-01

40

Automated diagnostics for aerospace power management systems  

SciTech Connect

Due to safety and mission criticality, aerospace power management systems require built in fault tolerance. Existing systems focus on hardware redundancy and lack the characteristics needed to provide rapid fault diagnostics and reconfiguration of power flow to critical users. Solid state power control (SSPC) electronics can provide faster switching times than electromechanical devices and when this technology is coupled with advanced software for diagnostics, a fault tolerant system design can be implemented. This paper describes a new project to integrate advanced SSPC electronics with newly available, knowledge-based diagnostic software in order to demonstrate the ability to detect, isolate and implement corrective action within a short period of time consistent with requirements for uninterrupted power. A fast embedded microprocessor will be used to run the diagnostic software and control power electronics. This project seeks to demonstrate the technology needed to enable a power management and distribution system to automatically compensate for faults in real time.

Granieri, M.N. [Giordano Automation Corp., Sparta, NJ (United States); Darty, M. [McDonnell Douglas Aerospace, Huntsville, AL (United States)

1995-12-31

41

Robust diagnostic system: structural redundancy approach  

NASA Astrophysics Data System (ADS)

We have developed and field tested a real-time robust diagnostic system, which uses hierarchical, multiple-aspect models of plants. The models include the functional structure, timed failure propagation graphs, physical component structure, and component failure modes. The diagnostic reasoning applies structural and temporal constraints for the generation and validation of fault hypotheses using the `predictor-corrector' principle. The diagnosis is generated in real time, amid an evolving alarm scenario, and uses progressive deepening control strategy. The robust diagnostic system has been tested and demonstrated using ECLSS models obtained from the Boeing Company.

Misra, Amit; Sztipanovitz, Janos; Carnes, James R.

1994-03-01

42

A New Full-Field Digital Mammography System with and without the Use of an Advanced Post-Processing Algorithm: Comparison of Image Quality and Diagnostic Performance  

PubMed Central

Objective To compare new full-field digital mammography (FFDM) with and without use of an advanced post-processing algorithm to improve image quality, lesion detection, diagnostic performance, and priority rank. Materials and Methods During a 22-month period, we prospectively enrolled 100 cases of specimen FFDM mammography (Brestige®), which was performed alone or in combination with a post-processing algorithm developed by the manufacturer: group A (SMA), specimen mammography without application of "Mammogram enhancement ver. 2.0"; group B (SMB), specimen mammography with application of "Mammogram enhancement ver. 2.0". Two sets of specimen mammographies were randomly reviewed by five experienced radiologists. Image quality, lesion detection, diagnostic performance, and priority rank with regard to image preference were evaluated. Results Three aspects of image quality (overall quality, contrast, and noise) of the SMB were significantly superior to those of SMA (p < 0.05). SMB was significantly superior to SMA for visualizing calcifications (p < 0.05). Diagnostic performance, as evaluated by cancer score, was similar between SMA and SMB. SMB was preferred to SMA by four of the five reviewers. Conclusion The post-processing algorithm may improve image quality with better image preference in FFDM than without use of the software. PMID:24843234

Ahn, Hye Shin; Jang, Mijung; Yun, Bo La; Kim, Bohyoung; Ko, Eun Sook; Han, Boo-Kyung; Chang, Jung Min; Yi, Ann; Cho, Nariya; Moon, Woo Kyung; Choi, Hye Young

2014-01-01

43

Robust diagnostic system: structural redundancy approach  

Microsoft Academic Search

We have developed and field tested a real-time robust diagnostic system, which uses hierarchical, multiple-aspect models of plants. The models include the functional structure, timed failure propagation graphs, physical component structure, and component failure modes. The diagnostic reasoning applies structural and temporal constraints for the generation and validation of fault hypotheses using the `predictor-corrector' principle. The diagnosis is generated in

Amit Misra; Janos Sztipanovits; James R. Carnes

1994-01-01

44

High-energy laser plasma diagnostic system  

NASA Astrophysics Data System (ADS)

This paper describes the development of a non-contact diagnosis system for analyzing the plasma density profile, temperature profile, and ionic species of a high energy laser-generated plasma. The system was developed by Physical Optics Corporation in cooperation with the U.S. Army Space and Missile Defense Command, High Energy Laser Systems Test Facility at White Sands Missile Range, New Mexico. The non- contact diagnostic system consists of three subsystems: an optical fiber-based interferometer, a plasma spectrometer, and a genetic algorithm-based fringe-image processor. In the interferometer subsystem, the transmitter and the receiver are each packaged as a compact module. A narrow notch filter rejects strong plasma light, passing only the laser probing beam, which carries the plasma density information. The plasma spectrum signal is collected by an optical fiber head, which is connected to a compact spectrometer. Real- time genetic algorithm-based data processing/display permits instantaneous analysis of the plasma characteristics. The research effort included design and fabrication of a vacuum chamber, and high-energy laser plasma generation. Compactness, real-time operation, and ease of use make the laser plasma diagnosis system well suited for dual use applications such as diagnosis of electric arc and other industrial plasmas.

Zhao, Mingjun M.; Aye, Tin M.; Fruehauf, Norbert; Savant, Gajendra D.; Erwin, Daniel A.; Smoot, Brayton E.; Loose, Richard W.

2000-07-01

45

Image Processing System  

NASA Technical Reports Server (NTRS)

Mallinckrodt Institute of Radiology (MIR) is using a digital image processing system which employs NASA-developed technology. MIR's computer system is the largest radiology system in the world. It is used in diagnostic imaging. Blood vessels are injected with x-ray dye, and the images which are produced indicate whether arteries are hardened or blocked. A computer program developed by Jet Propulsion Laboratory known as Mini-VICAR/IBIS was supplied to MIR by COSMIC. The program provides the basis for developing the computer imaging routines for data processing, contrast enhancement and picture display.

1986-01-01

46

Plasma spray processes: diagnostics and control?  

Microsoft Academic Search

The expenses related to the rejection and replacement of imperfect coatings can reach 15% of the production cost. Thus, for manufacturers, the reproducibility and reliability of plasma sprayed coatings are the main goals for respecting quality standards and decreasing production cost. The aim of this paper is a tentative to answer to the questions: —Which diagnostics can be used within

Michel Vardelle; Pierre Fauchais

1999-01-01

47

High bandwidth vapor density diagnostic system  

DOEpatents

A high bandwidth vapor density diagnostic system for measuring the density of an atomic vapor during one or more photoionization events. The system translates the measurements from a low frequency region to a high frequency, relatively noise-free region in the spectrum to provide improved signal to noise ratio.

Globig, Michael A. (Antioch, CA); Story, Thomas W. (Oakley, CA)

1992-01-01

48

Diagnostics and Control in the Thermal Spray Process  

SciTech Connect

The plasma-spray process features complex plasma-particle interactions that can result in process variations that limit process repeatability and coating performance. This paper reports our work on the development of real-time diagnostics and control for the plasma spray process. The strategy is to directly monitor and control those degrees of freedom of the process that are observable, controllable and affect resulting coating properties. This includes monitoring of particle velocity and temperature as well as the shape and trajectory of the spray pattern. Diagnostics that have been developed specifically for this purpose are described along with the demonstration of a closed loop process controller based on these measurements.

Fincke, James Russell; Swank, William David; Bewley, Randy Lee; Haggard, Delon C; Gevelber, M.; Wroblewski, D.

2001-12-01

49

Residual diagnostics for covariate effects in spatial point process models  

Microsoft Academic Search

For a spatial point process model in which the intensity depends on spatial covariates, we develop graphical diagnostics for validating the covariate effect term in the model, and for assessing whether another covariate should be added to the model. The diagnostics are point-process counterparts of the well-known partial residual plots (component-plus-residual plots) and added-variable plots for generalized linear models. The

Adrian Baddeley; Ya-Mei Chang; Yong Song; Rolf Turner

2012-01-01

50

Systemic mastocytosis - a diagnostic challenge  

PubMed Central

Mastocytosis refers to a group of disorders characterized by the infiltration of clonally derived mast cells to the skin or extracutaneous tissues resulting in a heterogeneous clinical picture. It is a rare hematologic disorder in all its forms. The exact incidence is unknown; it affects patients of any age and males and females equally. Its molecular pathogenesis is incompletely understood. The clinical features of mastocytosis result from both chronic and episodic mast cell mediator release, signs and symptoms arising from diffuse or focal tissue infiltration, and, occasionally, the presence of an associated non-mast cell clonal hematologic disease. The histopathologic analysis is essential for definitive diagnosis but there is no curative treatment. The authors report a clinical case of a 72-year-old woman with no history of allergies, with bicytopenia, weight loss, and diffuse axial osteolytic lesions. This is a rare clinical case of aggressive systemic mastocytosis for which palliative treatment can improve survival and quality of life. A brief review of the literature about this pathology is also included. PMID:25031064

Llado, Ana Cristina Amorim Oliveira Gaia; Mihon, Claudia Elena; Silva, Madalena; Galzerano, Antonio

2014-01-01

51

FIDEX: An expert system for satellite diagnostics  

NASA Technical Reports Server (NTRS)

A Fault Isolation and Diagnostic Expert system (FIDEX) was developed for communication satellite diagnostics. It was designed specifically for the 30/20 GHz satellite transponder. The expert system was designed with a generic structure and features that make it applicable to other types of space systems. FIDEX is a frame based system that enjoys many of the inherent frame base features, such as hierarchy that describes the transponder's components, with other hierarchies that provide structural and fault information about the transponder. This architecture provides a flexible diagnostic structure and enhances maintenance of the system. FIDEX also includes an inexact reasoning technique and a primitive learning ability. Inexact reasoning was an important feature for this system due to the sparse number of sensors available to provide information on the transponder's performance. FIDEX can determine the most likely faulted component under the constraint of limited information. FIDEX learns about the most likely faults in the transponder by keeping a record of past established faults. FIDEX also has the ability to detect anomalies in the sensors that provide information on the transponders performance.

Durkin, John; Tallo, Donald; Petrik, Edward J.

1991-01-01

52

Advanced Light Source beam diagnostics systems  

SciTech Connect

The Advanced Light Source (ALS), a third-generation synchrotron light source, has been recently commissioned. Beam diagnostics were very important to the success of the operation. Each diagnostic system is described in this paper along with detailed discussion of its performance. Some of the systems have been in operation for two years. Others, in the storage ring, have not yet been fully commissioned. These systems were, however, working well enough to provide the essential information needed to store beam. The devices described in this paper include wall current monitors, a beam charge monitor, a 50 ohm Faraday cup, DC current transformers, broad-hand striplines, fluorescence screens, beam collimators and scrapers, and beam position monitors. Also, the means by which waveforms are digitized and displayed in the control room is discussed.

Hinkson, J.

1993-10-01

53

Signal processing methods for MFE plasma diagnostics  

SciTech Connect

The application of various signal processing methods to extract energy storage information from plasma diamagnetism sensors occurring during physics experiments on the Tandom Mirror Experiment-Upgrade (TMX-U) is discussed. We show how these processing techniques can be used to decrease the uncertainty in the corresponding sensor measurements. The algorithms suggested are implemented using SIG, an interactive signal processing package developed at LLNL.

Candy, J.V.; Casper, T.; Kane, R.

1985-02-01

54

A proposed computer diagnostic system for malignant melanoma (CDSMM).  

PubMed

This paper describes a computer diagnostic system for malignant melanoma. The diagnostic system is a rule base system based on image analyses and works under the PC windows environment. It consists of seven modules: I/O module, Patient/Clinic database, image processing module, classification module, rule base module and system control module. In the system, the image analyses are automatically carried out, and database management is efficient and fast. Both final clinic results and immediate results from various modules such as measured features, feature pictures and history records of the disease lesion can be presented on screen or printed out from each corresponding module or from the I/O module. The system can also work as a doctor's office-based tool to aid dermatologists with details not perceivable by the human eye. Since the system operates on a general purpose PC, it can be made portable if the I/O module is disconnected. PMID:7964215

Shao, S; Grams, R R

1994-04-01

55

Diagnostic Systems for the Ignitor Experiment  

NASA Astrophysics Data System (ADS)

The main purpose of the Ignitor experiment (R01.32 m, a xb0.47x0.83 m ^2, BT<=13 T, Ip<=11 MA) is that of establishing the reactor physics in regimes close to ignition (TeTi11 keV, n010^ 21 m-3). The pulse evolution at the maximum machine parameters is characterized by a ramp-up phase of the plasma current of 4 s and 4 s of flat-top, which allow to reach fully relaxed current profiles. The set of baseline diagnostic systems includes, among others, the advanced neutron spectrometer originally proposed for Ignitor and later adopted on JET, Thomson Scattering, ECE, High Resolution X-ray Spectrometer. A Dispersion-Interferometer operating at 1 ?m instead of the conventional Two-color Interferometer at 10 ?m is being considered for plasma density measurements. The high plasma density and temperature, together with the use of tritium, impose some limitations on diagnostic systems based on NB injection, escaping particles or in direct connection with the high vacumm of the plasma chamber. The high neutron flux is also expected to challenge the systems more directly exposed to it, although the low fluences do not pose particular concerns on material survival. The conceptual design of the main diagnostic systems has been carried out and the present lay-out around the machine is shown.

Bombarda, F.; Giammanco, F.

2011-11-01

56

Adaptive Embedded Digital System for Plasma Diagnostics  

NASA Astrophysics Data System (ADS)

An Adaptive Embedded Digital System to perform plasma diagnostics using electrostatic probes was developed at the Plasma Engineering Laboratory at Polytechnic University of Puerto Rico. The system will replace the existing instrumentation at the Laboratory, using reconfigurable hardware to minimize the equipment and software needed to perform diagnostics. The adaptability of the design resides on the possibility of replacing the computational algorithm on the fly, allowing to use the same hardware for different probes. The system was prototyped using Very High Speed Integrated Circuits Hardware Description Language (VHDL) into an Field Programmable Gate Array (FPGA) board. The design of the Embedded Digital System includes a Zero Phase Digital Filter, a Derivative Unit, and a Computational Unit designed using the VHDL-2008 Support Library. The prototype is able to compute the Plasma Electron Temperature and Density from a Single Langmuir probe. The system was tested using real data previously acquired from a single Langmuir probe. The plasma parameters obtained from the embedded system were compared with results computed using matlab yielding excellent matching. The new embedded system operates on 4096 samples versus 500 on the previous system, and completes its computations in 26 milliseconds compared with about 15 seconds on the previous system.

González, Angel; Rodríguez, Othoniel; Mangual, Osvaldo; Ponce, Eduardo; Vélez, Xavier

2014-05-01

57

Laser metrology — a diagnostic tool in automotive development processes  

NASA Astrophysics Data System (ADS)

Laser measurement techniques are widely used in automotive development processes. Applications at Volkswagen are presented where laser metrology works as a diagnostic tool for analysing and optimising complex coupled processes inside and between automotive components and structures such as the reduction of a vehicle's interior or outer acoustic noise, including brake noise, and the combustion analysis for diesel and gasoline engines to further reduce fuel consumption and pollution. Pulsed electronic speckle pattern interferometry (ESPI) and holographic interferometry are used for analysing the knocking behaviour of modern engines and for correct positioning of knocking sensors. Holographic interferometry shows up the vibrational behaviour of brake components and their interaction during braking, and allows optimisation for noise-free brake systems. Scanning laser vibrometry analyses structure-born noise of a whole car body for the optimisation of its interior acoustical behaviour.Modern engine combustion concepts such as in direct-injection (DI) gasoline and diesel engines benefit from laser diagnostic tools which permit deeper insight into the in-cylinder processes such as flow generation, fuel injection and spray formation, atomisation and mixing, ignition and combustion, and formation and reduction of pollutants. The necessary optical access inside a cylinder is realised by so-called 'transparent engines' allowing measurements nearly during the whole engine cycle. Measurement techniques and results on double-pulse particle image velocimetry (PIV) with a frequency-doubled YAG laser for in-cylinder flow analysis are presented, as well as Mie-scattering on droplets using a copper vapour laser combined with high-speed filming, and laser-induced fluorescence (LIF) with an excimer laser for spray and fuel vapour analysis.

Beeck, Manfred-Andreas; Hentschel, Werner

2000-08-01

58

Diagnostic systems in DEMO: Engineering design issues  

NASA Astrophysics Data System (ADS)

The diagnostic systems of DEMO that are mounted on or near the torus, whether intended for the monitoring and control functions of the engineering aspects or the physics behaviour of the machine, will have to be designed to suit the hostile nuclear environment. This will be necessary not just for their survival and correct functioning but also to satisfy the pertinent regulatory bodies, especially where any of them relate to machine protection or the prevention or mitigation of accidents foreseen in the safety case. This paper aims to indicate the more important of the reactor design considerations that are likely to apply to diagnostics for DEMO, drawn from experience on JET, the provisions in hand for ITER and modelling results for the wall erosion and neutron damage effects in DEMO.

Todd, T. N.

2014-08-01

59

[General aspects of the diagnostic process in acute organic psychoses].  

PubMed

Following the Central European tradition of the triad system of psychiatry of Kurt Schneider (I. Abnormal Reactions/Personalities, II. Acute/Chronic Organic Psychosis, III. Schizophrenia/Cyclothymia) (19) a series of 210 cases of acute organic psychoses was collected. In contrast to DSM-III and in accord with W.A. Lishman (10), this series comprises not only delirium, but the entire range of impairments of consciousness from the "Durchgangssyndrom" of H.H. Wieck (24) to clouding of consciousness and coma, twilight states or apallic syndromes. From this series we present some elementary quantitative data concerning the age distribution of different etiologies, that are generally considered helpful in the diagnostic process. In contrast to this opinion, a single case of bromazepam-induced delirium shows: The anamnesis may be misleading, the general and neurological examination as well as the radiological, laboratory and electrophysiological tests could be insignificant. The essential diagnostic tool is the descriptive or phenomenological psychopathological observation. Compared to it, the general data of the age distribution of different etiologies of organic psychoses are of comparably little help in making a diagnosis. Artificial intelligence and medical expert systems are set out to replace the diagnosis of the physician. Eliminative materialistic neuroscience is set out to replace old-fashioned descriptive psychopathology by quantitative electrical and chemical data. Through the method of systematically confronting general quantitative data with suitably chosen single cases it should be possible to find out essential differences between general reductionist statements and the properties of complex qualitative phenomena like the individual human mind. PMID:7685542

Spittler, J F

1993-01-01

60

DEVELOPMENT OF SIGNAL PROCESSING TOOLS AND HARDWARE FOR PIEZOELECTRIC SENSOR DIAGNOSTIC PROCESSES  

SciTech Connect

This paper presents a piezoelectric sensor diagnostic and validation procedure that performs in -situ monitoring of the operational status of piezoelectric (PZT) sensor/actuator arrays used in structural health monitoring (SHM) applications. The validation of the proper function of a sensor/actuator array during operation, is a critical component to a complete and robust SHM system, especially with the large number of active sensors typically involved. The method of this technique used to obtain the health of the PZT transducers is to track their capacitive value, this value manifests in the imaginary part of measured electrical admittance. Degradation of the mechanical/electric properties of a PZT sensor/actuator as well as bonding defects between a PZT patch and a host structure can be identified with the proposed procedure. However, it was found that temperature variations and changes in sensor boundary conditions manifest themselves in similar ways in the measured electrical admittances. Therefore, they examined the effects of temperature variation and sensor boundary conditions on the sensor diagnostic process. The objective of this study is to quantify and classify several key characteristics of temperature change and to develop efficient signal processing techniques to account for those variations in the sensor diagnostis process. In addition, they developed hardware capable of making the necessary measurements to perform the sensor diagnostics and to make impedance-based SHM measurements. The paper concludes with experimental results to demonstrate the effectiveness of the proposed technique.

OVERLY, TIMOTHY G. [Los Alamos National Laboratory; PARK, GYUHAE [Los Alamos National Laboratory; FARRAR, CHARLES R. [Los Alamos National Laboratory

2007-02-09

61

Climate Model Diagnostic Analyzer Web Service System  

NASA Astrophysics Data System (ADS)

The latest Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report stressed the need for the comprehensive and innovative evaluation of climate models with newly available global observations. The traditional approach to climate model evaluation, which compares a single parameter at a time, identifies symptomatic model biases and errors but fails to diagnose the model problems. The model diagnosis process requires physics-based multi-variable comparisons that typically involve large-volume and heterogeneous datasets, making them both computationally- and data-intensive. To address these challenges, we are developing a parallel, distributed web-service system that enables the physics-based multi-variable model performance evaluations and diagnoses through the comprehensive and synergistic use of multiple observational data, reanalysis data, and model outputs. We have developed a methodology to transform an existing science application code into a web service using a Python wrapper interface and Python web service frameworks (i.e., Flask, Gunicorn, and Tornado). The web-service system, called Climate Model Diagnostic Analyzer (CMDA), currently supports (1) all the datasets from Obs4MIPs and a few ocean datasets from NOAA and Argo, which can serve as observation-based reference data for model evaluation and (2) many of CMIP5 model outputs covering a broad range of atmosphere, ocean, and land variables from the CMIP5 specific historical runs and AMIP runs. Analysis capabilities currently supported by CMDA are (1) the calculation of annual and seasonal means of physical variables, (2) the calculation of time evolution of the means in any specified geographical region, (3) the calculation of correlation between two variables, and (4) the calculation of difference between two variables. A web user interface is chosen for CMDA because it not only lowers the learning curve and removes the adoption barrier of the tool but also enables instantaneous use, avoiding the hassle of local software installation and environment incompatibility. CMDA is planned to be used as an educational tool for the summer school organized by JPL's Center for Climate Science in 2014. The requirements of the educational tool are defined with the interaction with the school organizers, and CMDA is customized to meet the requirements accordingly. The tool needs to be production quality for 30+ simultaneous users. The summer school will thus serve as a valuable testbed for the tool development, preparing CMDA to serve the Earth-science modeling and model-analysis community at the end of the project. This work was funded by the NASA Earth Science Program called Computational Modeling Algorithms and Cyberinfrastructure (CMAC).

Lee, S.; Pan, L.; Zhai, C.; Tang, B.; Jiang, J. H.

2013-12-01

62

Evaluation of Emerging Diagnostic Tools for Commercial HVAC Systems  

E-print Network

This paper compares and evaluates the capabilities of six emerging diagnostic tools for commercial HVAC systems. We present a brief description of the diagnostic tools, and then focus on evaluating the features of the tools. We include the following...

Friedman, H.; Piette, M. A.

2001-01-01

63

An inference engine for embedded diagnostic systems  

NASA Technical Reports Server (NTRS)

The implementation of an inference engine for embedded diagnostic systems is described. The system consists of two distinct parts. The first is an off-line compiler which accepts a propositional logical statement of the relationship between facts and conclusions and produces data structures required by the on-line inference engine. The second part consists of the inference engine and interface routines which accept assertions of fact and return the conclusions which necessarily follow. Given a set of assertions, it will generate exactly the conclusions which logically follow. At the same time, it will detect any inconsistencies which may propagate from an inconsistent set of assertions or a poorly formulated set of rules. The memory requirements are fixed and the worst case execution times are bounded at compile time. The data structures and inference algorithms are very simple and well understood. The data structures and algorithms are described in detail. The system has been implemented on Lisp, Pascal, and Modula-2.

Fox, Barry R.; Brewster, Larry T.

1987-01-01

64

Operation Diagnostics - Use of Operation Patterns to Verify and Optimize Building and System Operation  

E-print Network

Building energy management systems (BEMS) process a large amount of data to operate the building. Instead of using this data only to signal failures and breakdowns of systems, it can be further employed for enhanced operation diagnostics. Adequate...

Baumann, O.

2004-01-01

65

Mechatronics in monitoring, simulation, and diagnostics of industrial and biological processes  

NASA Astrophysics Data System (ADS)

The paper describes a number of research projects of the Faculty of Mechatronics of Warsaw University of Technology in order to illustrate the use of common mechatronics and optomechatronics approach in solving multidisciplinary technical problems. Projects on sensors development, measurement and industrial control systems, multimodal data capture and advance systems for monitoring and diagnostics of industrial processes are presented and discussed.

Golnik, Natalia; Dobosz, Marek; Jakubowska, Ma?gorzata; Ko?cielny, Jan M.; Kujawi?ska, Ma?gorzata; Pa?ko, Tadeusz; Putz, Barbara; Sitnik, Robert; Wnuk, Pawe?; Wo?niak, Adam

2013-10-01

66

Beam diagnostic systems in the IUCF Cooler and Cyclotron  

Microsoft Academic Search

Beam diagnostics for the Indiana University Cyclotron Facility (IUCF) Cooler synchrotron which have been recently developed include a beam phase feedback system to damp synchrotron oscillations induced by the RF system and a transverse phase space tracking system to measure the betatron fractional tunes and to investigate nonlinear beam dynamics. New cyclotron diagnostic systems include a new beam timing system

M. S. Ball; T. J. P. Ellison; B. J. Hamilton

1991-01-01

67

Model-Based Diagnostics for Propellant Loading Systems  

NASA Technical Reports Server (NTRS)

The loading of spacecraft propellants is a complex, risky operation. Therefore, diagnostic solutions are necessary to quickly identify when a fault occurs, so that recovery actions can be taken or an abort procedure can be initiated. Model-based diagnosis solutions, established using an in-depth analysis and understanding of the underlying physical processes, offer the advanced capability to quickly detect and isolate faults, identify their severity, and predict their effects on system performance. We develop a physics-based model of a cryogenic propellant loading system, which describes the complex dynamics of liquid hydrogen filling from a storage tank to an external vehicle tank, as well as the influence of different faults on this process. The model takes into account the main physical processes such as highly nonequilibrium condensation and evaporation of the hydrogen vapor, pressurization, and also the dynamics of liquid hydrogen and vapor flows inside the system in the presence of helium gas. Since the model incorporates multiple faults in the system, it provides a suitable framework for model-based diagnostics and prognostics algorithms. Using this model, we analyze the effects of faults on the system, derive symbolic fault signatures for the purposes of fault isolation, and perform fault identification using a particle filter approach. We demonstrate the detection, isolation, and identification of a number of faults using simulation-based experiments.

Daigle, Matthew John; Foygel, Michael; Smelyanskiy, Vadim N.

2011-01-01

68

Large sample hydrology in NZ: Spatial organisation in process diagnostics  

NASA Astrophysics Data System (ADS)

A key question in hydrology is how to predict the dominant runoff generation processes in any given catchment. This knowledge is vital for a range of applications in forecasting hydrological response and related processes such as nutrient and sediment transport. A step towards this goal is to map dominant processes in locations where data is available. In this presentation, we use data from 900 flow gauging stations and 680 rain gauges in New Zealand, to assess hydrological processes. These catchments range in character from rolling pasture, to alluvial plains, to temperate rainforest, to volcanic areas. By taking advantage of so many flow regimes, we harness the benefits of large-sample and comparative hydrology to study patterns and spatial organisation in runoff processes, and their relationship to physical catchment characteristics. The approach we use to assess hydrological processes is based on the concept of diagnostic signatures. Diagnostic signatures in hydrology are targeted analyses of measured data which allow us to investigate specific aspects of catchment response. We apply signatures which target the water balance, the flood response and the recession behaviour. We explore the organisation, similarity and diversity in hydrological processes across the New Zealand landscape, and how these patterns change with scale. We discuss our findings in the context of the strong hydro-climatic gradients in New Zealand, and consider the implications for hydrological model building on a national scale.

McMillan, H. K.; Woods, R. A.; Clark, M. P.

2013-12-01

69

Integrated Diagnostic System (IDS) for Aircraft Fleet Maintenance  

Microsoft Academic Search

The aim of the Integrated Diagnostic System (IDS) project is to research, develop and test advanced diagnostic and decision support tools for maintenance of complex machinery. This paper provides an overview of the hybrid reasoning conducted within this system with particular reference to Case-Based Reasoning (CBR) and its integration in this environment. The technical development of this system is outlined

Michael Lehane; Francois Dub; Michael Halasz; Robert Orchard; Rob Wylie; Marvin Zaluski

70

THE INFORMATION-ANALYTICAL SYSTEM FOR DIAGNOSTICS OF AIRCRAFT NAVIGATION UNITS  

Microsoft Academic Search

The operation of technical processes requires increasingly advanced supervision and fault diagnostics to improve reliability and safety. This paper gives an introduction to the field of fault detection and diagnostics and has short methods classification. Growth of complexity and functional importance of inertial navigation systems leads to high losses at the equipment refusals. The paper is devoted to the INS

Ilya Prokoshev; Vyacheslav Suminov

71

Diagnostic Setup for Characterization of Near-Anode Processes in Hall Thrusters  

SciTech Connect

A diagnostic setup for characterization of near-anode processes in Hall-current plasma thrusters consisting of biased and emissive electrostatic probes, high-precision positioning system and low-noise electronic circuitry was developed and tested. Experimental results show that radial probe insertion does not cause perturbations to the discharge and therefore can be used for accurate near-anode measurements.

L. Dorf; Y. Raitses; N.J. Fisch

2003-09-08

72

MFTF-B plasma-diagnostics-system instrumentation and data-acquisition system  

SciTech Connect

The change of scope for MFTF from a simple mirror to a tandem mirror configuration utilizing thermal barriers has expanded the range of plasma parameters and increased the requirements of the plasma diagnostics system. The instrument set that is needed for start-up operation has been identified and conceptual design work is proceeding. This paper describes the diagnostic instrumentation as presently envisioned for start-up operation, with a summary of the detectors and data channels. Also presented is an overview of the current conceptual design for the Local Control and Data Acquisition System and the Data Processing and Display system. As more detailed design is done, the exact number and nature of instruments may change, but overall, the system described here is one expected to satisfy the requirements for start-up and be expandable to the basic set of diagnostics.

Goerz, D.A.; Lau, N.H.C.; Mead, J.E.; Throop, A.L.

1981-10-21

73

A diagnostic expert system for digital circuits  

NASA Astrophysics Data System (ADS)

A scheme is presented for a diagnostic expert system which is capable of troubleshooting a faulty digital circuit or producing a reduced test vector set for a non-faulty digital circuit. It is based on practical fault-finding logic and utilizes artificial intelligence techniques. The program uses expert knowledge comprised of two components: that which is contained within the program in the form of rules and heuristics, and that which is derived from the circuit under test in the form of specific device information. Using both forward and backward tracking algorithms, signal paths comprised of device and gate interconnections are identified from each output pin to the primary input pins which have effect on them. Beginning at the output, the program proceeds to validate each device in each signal path by forward propagating test values through the device to the output, and backward propagating the same values to the primary inputs. All devices in the circuit are monitored for each test applied and their performance is recorded. Device or gate validation occurs when the recorded history shows that a device has been toggled successfully through all necessary states. When run on a circuit which does not contain a fault, the program determines a reduced test vector set for that circuit.

Backlund, R. W.; Wilson, J. D.

1992-04-01

74

SOPROLIFE System: An Accurate Diagnostic Enhancer  

PubMed Central

Objectives. The aim of this study was to evaluate a light-emitting diode fluorescence tool, the SOPROLIFE light-induced fluorescence evaluator, and compare it to the international caries detection and assessment system-II (ICDAS-II) in the detection of occlusal caries. Methods. A total of 219 permanent posterior teeth in 21 subjects, with age ranging from 15 to 65 years, were examined. An intraclass correlation coefficient (ICC) was computed to assess the reliability between the two diagnostic methods. Results. The results showed a high reliability between the two methods (ICC = 0.92; IC = 0.901–0.940; P < 0.001). The SOPROLIFE blue fluorescence mode had a high sensitivity (87%) and a high specificity (99%) when compared to ICDAS-II. Conclusion. Compared to the most used visual method in the diagnosis of occlusal caries lesions, the finding from this study suggests that SOPROLIFE can be used as a reproducible and reliable assessment tool. At a cut-off point, categorizing noncarious lesions and visual change in enamel, SOPROLIFE shows a high sensitivity and specificity. We can conclude that financially ICDAS is better than SOPROLIFE. However SOPROLIFE is easier for clinicians since it is a simple evaluation of images. Finally in terms of efficiency SOPROLIFE is not superior to ICDAS but tends to be equivalent with the same advantages.

Zeitouny, Mona; Feghali, Mireille; Nasr, Assaad; Abou-Samra, Philippe; Saleh, Nadine; Bourgeois, Denis; Farge, Pierre

2014-01-01

75

Non-diagnostic intelligent tutoring systems: Teaching without student models  

Microsoft Academic Search

The keystones of traditional intelligent tutoring systems (ITSs) have been complex procedures for student diagnosis and adaptive instruction based on diagnostic data. While some of these systems have been shown to be effective, they are also very expensive to develop. This paper describes another class of ITSs, non-diagnostic ITSs, which do little or no student diagnosis, and concentrate their intelligence

Leo Gugerty

1997-01-01

76

REDEX - The ranging equipment diagnostic expert system  

NASA Technical Reports Server (NTRS)

REDEX, an advanced prototype expert system that diagnoses hardware failures in the Ranging Equipment (RE) at NASA's Ground Network tracking stations is described. REDEX will help the RE technician identify faulty circuit cards or modules that must be replaced, and thereby reduce troubleshooting time. It features a highly graphical user interface that uses color block diagrams and layout diagrams to illustrate the location of a fault. A semantic network knowledge representation technique was used to model the design structure of the RE. A catalog of generic troubleshooting rules was compiled to represent heuristics that are applied in diagnosing electronic equipment. Specific troubleshooting rules were identified to represent additional diagnostic knowledge that is unique to the RE. Over 50 generic and 250 specific troubleshooting rules have been derived. REDEX is implemented in Prolog on an IBM PC AT-compatible workstation. Block diagram graphics displays are color-coded to identify signals that have been monitored or inferred to have nominal values, signals that are out of tolerance, and circuit cards and functions that are diagnosed as faulty. A hypertext-like scheme is used to allow the user to easily navigate through the space of diagrams and tables. Over 50 graphic and tabular displays have been implemented. REDEX is currently being evaluated in a stand-alone mode using simulated RE fault scenarios. It will soon be interfaced to the RE and tested in an online environment. When completed and fielded, REDEX will be a concrete example of the application of expert systems technology to the problem of improving performance and reducing the lifecycle costs of operating NASA's communications networks in the 1990s.

Luczak, Edward C.; Gopalakrishnan, K.; Zillig, David J.

1989-01-01

77

REDEX: The ranging equipment diagnostic expert system  

NASA Technical Reports Server (NTRS)

REDEX, an advanced prototype expert system that diagnoses hardware failures in the Ranging Equipment (RE) at NASA's Ground Network tracking stations is described. REDEX will help the RE technician identify faulty circuit cards or modules that must be replaced, and thereby reduce troubleshooting time. It features a highly graphical user interface that uses color block diagrams and layout diagrams to illustrate the location of a fault. A semantic network knowledge representation technique was used to model the design structure of the RE. A catalog of generic troubleshooting rules was compiled to represent heuristics that are applied in diagnosing electronic equipment. Specific troubleshooting rules were identified to represent additional diagnostic knowledge that is unique to the RE. Over 50 generic and 250 specific troubleshooting rules have been derived. REDEX is implemented in Prolog on an IBM PC AT-compatible workstation. Block diagram graphics displays are color-coded to identify signals that have been monitored or inferred to have nominal values, signals that are out of tolerance, and circuit cards and functions that are diagnosed as faulty. A hypertext-like scheme is used to allow the user to easily navigate through the space of diagrams and tables. Over 50 graphic and tabular displays have been implemented. REDEX is currently being evaluated in a stand-alone mode using simulated RE fault scenarios. It will soon be interfaced to the RE and tested in an online environment. When completed and fielded, REDEX will be a concrete example of the application of expert systems technology to the problem of improving performance and reducing the lifecycle costs of operating NASA's communications networks in the 1990's.

Luczak, Edward C.; Gopalakrishnan, K.; Zillig, David J.

1989-01-01

78

Diagnostics and modeling of an argon\\/helium plasma spray process  

Microsoft Academic Search

The natural instability of the are in direct current (DC) plasma torches used in spray processing is one of the most important\\u000a causes for variations in heating of sprayed particles, leading to inconsistencies in the final coating quality. A relatively\\u000a simple diagnostic system has been set up to monitor the plasma jet instability, as well as some important process characteristics.

Z. Duan; J. Heberlein; L. Beall; J. Schein; M. Stachowicz

2000-01-01

79

Method and system for diagnostics of apparatus  

NASA Technical Reports Server (NTRS)

Proposed is a method, implemented in software, for estimating fault state of an apparatus outfitted with sensors. At each execution period the method processes sensor data from the apparatus to obtain a set of parity parameters, which are further used for estimating fault state. The estimation method formulates a convex optimization problem for each fault hypothesis and employs a convex solver to compute fault parameter estimates and fault likelihoods for each fault hypothesis. The highest likelihoods and corresponding parameter estimates are transmitted to a display device or an automated decision and control system. The obtained accurate estimate of fault state can be used to improve safety, performance, or maintenance processes for the apparatus.

Gorinevsky, Dimitry (Inventor)

2012-01-01

80

Data collection framework for vehicular On-Board-Diagnostic systems  

E-print Network

Most modern vehicles contain an On-Board-Diagnostic (OBD) system that can collect a wide range of system data from the vehicle. In aggregation, such data could be applied towards solving the problems of accident prevention, ...

Liu, Chenxia

2011-01-01

81

Reactor protection system with automatic self-testing and diagnostic  

DOEpatents

A reactor protection system is disclosed having four divisions, with quad redundant sensors for each scram parameter providing input to four independent microprocessor-based electronic chassis. Each electronic chassis acquires the scram parameter data from its own sensor, digitizes the information, and then transmits the sensor reading to the other three electronic chassis via optical fibers. To increase system availability and reduce false scrams, the reactor protection system employs two levels of voting on a need for reactor scram. The electronic chassis perform software divisional data processing, vote 2/3 with spare based upon information from all four sensors, and send the divisional scram signals to the hardware logic panel, which performs a 2/4 division vote on whether or not to initiate a reactor scram. Each chassis makes a divisional scram decision based on data from all sensors. Automatic detection and discrimination against failed sensors allows the reactor protection system to automatically enter a known state when sensor failures occur. Cross communication of sensor readings allows comparison of four theoretically ``identical`` values. This permits identification of sensor errors such as drift or malfunction. A diagnostic request for service is issued for errant sensor data. Automated self test and diagnostic monitoring, sensor input through output relay logic, virtually eliminate the need for manual surveillance testing. This provides an ability for each division to cross-check all divisions and to sense failures of the hardware logic. 16 figs.

Gaubatz, D.C.

1996-12-17

82

Reactor protection system with automatic self-testing and diagnostic  

DOEpatents

A reactor protection system having four divisions, with quad redundant sensors for each scram parameter providing input to four independent microprocessor-based electronic chassis. Each electronic chassis acquires the scram parameter data from its own sensor, digitizes the information, and then transmits the sensor reading to the other three electronic chassis via optical fibers. To increase system availability and reduce false scrams, the reactor protection system employs two levels of voting on a need for reactor scram. The electronic chassis perform software divisional data processing, vote 2/3 with spare based upon information from all four sensors, and send the divisional scram signals to the hardware logic panel, which performs a 2/4 division vote on whether or not to initiate a reactor scram. Each chassis makes a divisional scram decision based on data from all sensors. Automatic detection and discrimination against failed sensors allows the reactor protection system to automatically enter a known state when sensor failures occur. Cross communication of sensor readings allows comparison of four theoretically "identical" values. This permits identification of sensor errors such as drift or malfunction. A diagnostic request for service is issued for errant sensor data. Automated self test and diagnostic monitoring, sensor input through output relay logic, virtually eliminate the need for manual surveillance testing. This provides an ability for each division to cross-check all divisions and to sense failures of the hardware logic.

Gaubatz, Donald C. (Cupertino, CA)

1996-01-01

83

Target diagnostic system for the National Ignition Facility (NIF)  

SciTech Connect

A review of recent progress on the design of a diagnostic system proposed for ignition target experiments on the National Ignition Facility (NIF) will be presented. This diagnostic package contains an extensive suite of optical, x-ray, gamma-ray, and neutron diagnostics that enable measurements of the performance of both direct and indirect driven NIF targets. The philosophy used in designing all of the diagnostics in the set has emphasized redundant and independent measurement of fundamental physical quantities relevant to the operation of the NIF target. A unique feature of these diagnostics is that they are being designed to be capable of operating, in the high radiation, EMP, and debris backgrounds expected on the NIF facility. The diagnostic system proposed can be categorized into three broad areas: laser characterization, hohlraum characterization, and capsule performance diagnostics. The operating principles of a representative instrument from each class of diagnostic employed in this package will be summarized and illustrated with data obtained in recent prototype diagnostic tests.

Leeper, R.J.; Chandler, G.A.; Cooper, G.W.; Derzon, M.S. [and others

1996-07-01

84

Target Diagnostic Control System Implementation for the National Ignition Facility  

SciTech Connect

The extreme physics of targets shocked by NIF's 192-beam laser are observed by a diverse suite of diagnostics. Many diagnostics are being developed by collaborators at other sites, but ad hoc controls could lead to unreliable and costly operations. A Diagnostic Control System (DCS) framework for both hardware and software facilitates development and eases integration. Each complex diagnostic typically uses an ensemble of electronic instruments attached to sensors, digitizers, cameras, and other devices. In the DCS architecture each instrument is interfaced to a low-cost Windows XP processor and Java application. Each instrument is aggregated with others as needed in the supervisory system to form an integrated diagnostic. The Java framework provides data management, control services and operator GUI generation. DCS instruments are reusable by replication with reconfiguration for specific diagnostics in XML. Advantages include minimal application code, easy testing, and high reliability. Collaborators save costs by assembling diagnostics with existing DCS instruments. This talk discusses target diagnostic instrumentation used on NIF and presents the DCS architecture and framework.

Shelton, R T; Kamperschroer, J H; Lagin, L J; Nelson, J R; O'Brien, D W

2010-05-12

85

INTEGRATION OF ARTIFICIAL INTELLIGENCE SYSTEMS FOR NUCLEAR POWER PLANT SURVEILLANCE AND DIAGNOSTICS  

Microsoft Academic Search

The objective of this program is to design, construct operate, test, and evaluate a prototype integrated monitoring and diagnostic system for a nuclear power plant. It is anticipated that this technology will have wide application to other complex systems (e.g., fossil power plants, chemical processing plants, and possibly air traffic control systems). Over the past decade, the University of Tennessee

Robert E. Uhrig; J. Wesley Hines; William R. Nelson

86

Diagnostic for Plasma Enhanced Chemical Vapor Deposition and Etch Systems  

NASA Technical Reports Server (NTRS)

In order to meet NASA's requirements for the rapid development and validation of future generation electronic devices as well as associated materials and processes, enabling technologies ion the processing of semiconductor materials arising from understanding etch chemistries are being developed through a research collaboration between Stanford University and NASA-Ames Research Center, Although a great deal of laboratory-scale research has been performed on many of materials processing plasmas, little is known about the gas-phase and surface chemical reactions that are critical in many etch and deposition processes, and how these reactions are influenced by the variation in operating conditions. In addition, many plasma-based processes suffer from stability and reliability problems leading to a compromise in performance and a potentially increased cost for the semiconductor manufacturing industry. Such a lack of understanding has hindered the development of process models that can aid in the scaling and improvement of plasma etch and deposition systems. The research described involves the study of plasmas used in semiconductor processes. An inductively coupled plasma (ICP) source in place of the standard upper electrode assembly of the Gaseous Electronics Conference (GEC) radio-frequency (RF) Reference Cell is used to investigate the discharge characteristics and chemistries. This ICP source generates plasmas with higher electron densities (approximately 10(exp 12)/cu cm) and lower operating pressures (approximately 7 mTorr) than obtainable with the original parallel-plate version of the GEC Cell. This expanded operating regime is more relevant to new generations of industrial plasma systems being used by the microelectronics industry. The motivation for this study is to develop an understanding of the physical phenomena involved in plasma processing and to measure much needed fundamental parameters, such as gas-phase and surface reaction rates. species concentration, temperature, ion energy distribution, and electron number density. A wide variety of diagnostic techniques are under development through this consortium grant to measure these parameters. including molecular beam mass spectrometry (MBMS). Fourier transform infrared (FTIR) spectroscopy, broadband ultraviolet (UV) absorption spectroscopy, a compensated Langmuir probe. Additional diagnostics. Such as microwave interferometry and microwave absorption for measurements of plasma density and radical concentrations are also planned.

Cappelli, Mark A.

1999-01-01

87

MRI-guided nanorobotic systems for therapeutic and diagnostic applications.  

PubMed

This review presents the state of the art of magnetic resonance imaging (MRI)-guided nanorobotic systems that can perform diagnostic, curative, and reconstructive treatments in the human body at the cellular and subcellular levels in a controllable manner. The concept of an MRI-guided nanorobotic system is based on the use of an MRI scanner to induce the required external driving forces to propel magnetic nanocapsules to a specific target. It is an active targeting mechanism that provides simultaneous propulsion and imaging capabilities, which allow the implementation of real-time feedback control of the targeting process. The architecture of the system comprises four main modules: (a) the nanocapsules, (b) the MRI propulsion module, (c) the MRI tracking module (for image processing), and (d) the controller module. A key concept is the nanocapsule technology, which is based on carriers such as liposomes, polymer micelles, gold nanoparticles, quantum dots, metallic nanoshells, and carbon nanotubes. Descriptions of the significant challenges faced by the MRI-guided nanorobotic system are presented, and promising solutions proposed by the involved research community are discussed. Emphasis is placed on reviewing the limitations imposed by the scaling effects that dominate within the blood vessels and also on reviewing the control algorithms and computational tools that have been developed for real-time propulsion and tracking of the nanocapsules. PMID:21529162

Vartholomeos, Panagiotis; Fruchard, Matthieu; Ferreira, Antoine; Mavroidis, Constantinos

2011-08-15

88

System Modeling and Diagnostics for Liquefying-Fuel Hybrid Rockets  

NASA Technical Reports Server (NTRS)

A Hybrid Combustion Facility (HCF) was recently built at NASA Ames Research Center to study the combustion properties of a new fuel formulation that burns approximately three times faster than conventional hybrid fuels. Researchers at Ames working in the area of Integrated Vehicle Health Management recognized a good opportunity to apply IVHM techniques to a candidate technology for next generation launch systems. Five tools were selected to examine various IVHM techniques for the HCF. Three of the tools, TEAMS (Testability Engineering and Maintenance System), L2 (Livingstone2), and RODON, are model-based reasoning (or diagnostic) systems. Two other tools in this study, ICS (Interval Constraint Simulator) and IMS (Inductive Monitoring System) do not attempt to isolate the cause of the failure but may be used for fault detection. Models of varying scope and completeness were created, both qualitative and quantitative. In each of the models, the structure and behavior of the physical system are captured. In the qualitative models, the temporal aspects of the system behavior and the abstraction of sensor data are handled outside of the model and require the development of additional code. In the quantitative model, less extensive processing code is also necessary. Examples of fault diagnoses are given.

Poll, Scott; Iverson, David; Ou, Jeremy; Sanderfer, Dwight; Patterson-Hine, Ann

2003-01-01

89

Diagnostics Systems for Permanent Hall Thrusters Development  

NASA Astrophysics Data System (ADS)

This work describes the development of Permanent Magnet Hall Effect Plasma Thruster (PHALL) and its diagnostic systems at The Plasma Physics Laboratory of University of Brasilia. The project consists on the construction and characterization of plasma propulsion engines based on the Hall Effect. Electric thrusters have been employed in over 220 successful space missions. Two types stand out: the Hall-Effect Thruster (HET) and the Gridded Ion Engine (GIE). The first, which we deal with in this project, has the advantage of greater simplicity of operation, a smaller weight for the propulsion subsystem and a longer shelf life. It can operate in two configurations: magnetic layer and anode layer, the difference between the two lying in the positioning of the anode inside the plasma channel. A Hall-Effect Thruster-HET is a type of plasma thruster in which the propellant gas is ionized and accelerated by a magneto hydrodynamic effect combined with electrostatic ion acceleration. So the essential operating principle of the HET is that it uses a J x B force and an electrostatic potential to accelerate ions up to high speeds. In a HET, the attractive negative charge is provided by electrons at the open end of the Thruster instead of a grid, as in the case of the electrostatic ion thrusters. A strong radial magnetic field is used to hold the electrons in place, with the combination of the magnetic field and the electrostatic potential force generating a fast circulating electron current, the Hall current, around the axis of the Thruster, mainly composed by drifting electrons in an ion plasma background. Only a slow axial drift towards the anode occurs. The main attractive features of the Hall-Effect Thruster are its simple design and operating principles. Most of the Hall-Effect Thrusters use electromagnet coils to produce the main magnetic field responsible for plasma generation and acceleration. In this paper we present a different new concept, a Permanent Magnet Hall-Effect Thruster (PMHET), developed at the Plasma Physics Laboratory of UnB. The idea of using an array of permanent magnets, instead of an electromagnet, to produce a radial magnetic field inside the cylindrical plasma drift channel of the thruster is very attractive, especially because of the possibility of developing a HET with power consumption low enough to be used in small satellites or medium-size satellites with low on board power. Hall-Effect Thrusters are now a very good option for spacecraft primary propulsion and also for station-keeping of medium and large satellites. This is because of their high specific impulse, efficient use of propellant mass and combined low and precise thrust capabilities, which are related to an economy in terms of propellant mass utilization , longer satellite lifetime and easier spacecraft maneuvering in microgravity environment. The first HETs were developed in the mid 1950’s, and they were first called Closed Drift Thrusters. Today, the successful use of electric thrusters for attitude control and orbit modification on hundreds of satellites shows the advanced stage of development of this technology. In addition to this, after the success of space missions such as Deep Space One and Dawn (NASA), Hayabusa (JAXA) and Smart-1 (ESA), the employment of electric thrusters is also consolidated for the primary propulsion of spacecraft. This success is mainly due to three factors: reliability of this technology; efficiency of propellant utilization, and therefore reduction of the initial mass of the ship; possibility of operation over long time intervals, with practically unlimited cycling and restarts. This thrusting system is designed to be used in satellite attitude control and long term space missions. One of the greatest advantage of this kind of thruster is the production of a steady state magnetic field by permanent magnets providing electron trapping and Hall current generation within a significant decrease on the electric energy supply and thus turning this thruster into a specially good option when it comes to space usage

Ferreira, Jose Leonardo; Soares Ferreira, Ivan; Santos, Jean; Miranda, Rodrigo; Possa, M. Gabriela

90

Devon C. Campbell Head, Engineering and Systems Novartis Molecular Diagnostics  

E-print Network

Thinking Conference October 25, 2011 Systems Thinking in Personalized Medicine #12;2 | Systems Thinking in Personalized Medicine | Novartis Molecular Diagnostics | MIT Systems Thinking Conference | October2011 Agenda PERSONALIZED MEDICINE Personalized medicine and the future of healthcare Novartis approach to personalized

91

System fault diagnostics using fault tree analysis  

Microsoft Academic Search

Over the last 50 years advances in technology have led to an increase in the complexity and sophistication of systems. More complex systems can be harder to maintain and the root cause of a fault more difficult to isolate. Down-time resulting from a system failure can be dangerous or expensive depending on the type of system. In aircraft systems the

E. E. Hurdle; L. M. Bartlett; J. D. Andrews

2008-01-01

92

Neural network based diagnostic system for accident management in nuclear power plants  

Microsoft Academic Search

An artificial neural network (ANN) based diagnostic system for identification of large break loss of coolant accident (LOCA) transients in nuclear power plants (NPPs) has been developed. This is an operator support system which assists the operator in identifying a transient quickly using ANNs. A large database of transient (LOCA) analyses of reactor process parameters has been generated for reactor

Santhosh; M. Kumar; I. Thangamani; D. Mukhopadhyay; V. Verma; V. V. S. S. Rao; K. K. Vaze; A. K. Ghosh

2010-01-01

93

The Control and Diagnostics System for the CEBAF Injector  

SciTech Connect

We present the first experience with the CEBAF injector control and diagnostics system. The computer architecture of the control system has been described elsewhere. The injector system is a model for the CEBAF controls. A computer system controls the gun, the steering magnets, and the focusing elements, and in the near future also the injector rf system. The beam parameters such as current, position, and emittance are measured by various monitors and are automatically analyzed by the computer.

P. Adderley; W. Barry; R. Bork; R. Cucinotta; C. Grubb; J. Heefner; J. Kewisch; P. Kloeppel; G. Lahti; T. Mason; E. Navarro; R. Pico; H. Robertson; R. Rossmanith; J. Sage; M. Wise

1988-10-01

94

An easy-to-use diagnostic system development shell  

NASA Technical Reports Server (NTRS)

The Diagnostic System Development Shell (DSDS), an expert system development shell for diagnostic systems, is described. The major objective of building the DSDS is to create a very easy to use and friendly environment for knowledge engineers and end-users. The DSDS is written in OPS5 and CommonLisp. It runs on a VAX/VMS system. A set of domain independent, generalized rules is built in the DSDS, so the users need not be concerned about building the rules. The facts are explicitly represented in a unified format. A powerful check facility which helps the user to check the errors in the created knowledge bases is provided. A judgement facility and other useful facilities are also available. A diagnostic system based on the DSDS system is question driven and can call or be called by other knowledge based systems written in OPS5 and CommonLisp. A prototype diagnostic system for diagnosing a Philips constant potential X-ray system has been built using the DSDS.

Tsai, L. C.; Ross, J. B.; Han, C. Y.; Wee, W. G.

1987-01-01

95

Systems for real-time optical diagnostics of biological objects  

NASA Astrophysics Data System (ADS)

The article concerns the development of the methods and systems for non-invasive optical diagnostics of tissues. The problems of information content tissue backscattering characteristics, planning the optical measurements and the interpretation of the data of optical sensing of the tissue by fibre-optic devices and systems of multispectral video reflectometry are considered.

Lisenko, S.; Kugeiko, M.; Hotra, O.; Surtel, W.

2014-08-01

96

Electrically heated particulate filter diagnostic systems and methods  

SciTech Connect

A system that diagnoses regeneration of an electrically heated particulate filter is provided. The system generally includes a grid module that diagnoses a fault of the grid based on at least one of a current signal and a voltage signal. A diagnostic module at least one of sets a fault status and generates a warning signal based on the fault of the grid.

Gonze, Eugene V [Pinckney, MI

2009-09-29

97

RADIATION DOSIMETRIC DIAGNOSTIC SYSTEM OF A FEL  

Microsoft Academic Search

This article describes the radiation monitoring system of the powerful teraherz free electron laser constructed at the Siberian Center for Photochemical Research on the basis of new unique hardware and software developed at Budker institute. The control system provides environment monitoring and radiation safety.

E. A. Kuper; A. D. Oreshkov; A. V. Repkov; T. V. Salikova; D. A. Sklokin; S. V. Tararyshkin; N. A. Vinokurov

98

The oral-systemic connection: role of salivary diagnostics  

NASA Astrophysics Data System (ADS)

Utilizing saliva instead of blood for diagnosis of both local and systemic health is a rapidly emerging field. Recognition of oral-systemic interrelationships for many diseases has fostered collaborations between medicine and dentistry, and many of these collaborations rely on salivary diagnostics. The oral cavity is easily accessed and contains most of the analytes present in blood. Saliva and mucosal transudate are generally utilized for oral diagnostics, but gingival crevicular fluid, buccal swabs, dental plaque and volatiles may also be useful depending on the analyte being studied. Examples of point-of-care devices capable of detecting HIV, TB, and Malaria targets are being developed and discussed in this overview.

Malamud, Daniel

2013-05-01

99

Wire-rope emplacement of diagnostics systems  

SciTech Connect

The study reported here was initiated to determine if, with the Cable Downhole System (CDS) currently under development, there is an advantage to using continuous wire rope to lower the emplacement package to the bottom of the hole. A baseline design using two wire ropes as well as several alternatives are discussed in this report. It was concluded that the advantages of the wire-rope emplacement system do not justify the cost of converting to such a system, especially for LLNL's maximum emplacement package weights.

Burden, W.L.

1982-05-07

100

Diagnostics of thermal plasma flow using intelligent systems  

Microsoft Academic Search

We describe here a multifunctional plasma diagnostic (MFPD) device being developed by Physical Optics Corporation using interferometry and spectroscopic techniques, along with an intelligent software package. The MFPD can provide a non- contact diagnosis of plasma density profile, temperature profile, and ionic species of plasmas. High-speed data processing is accomplished through automatic data acquisition hardware and an intelligent software package,

Helen H. Chen; Tin M. Aye; Vernon A. Brown; Gajendra D. Savant

1997-01-01

101

STATUS OF VARIOUS SNS DIAGNOSTIC SYSTEMS  

SciTech Connect

The Spallation Neutron Source (SNS) accelerator systems are ramping up to deliver a 1.0 GeV, 1.4 MW proton beam to a liquid mercury target for neutron scattering research. Enhancements or additions have been made to several instrument systems to support the ramp up in intensity, improve reliability, and/or add functionality. The Beam Current Monitors now support increased rep rates, the Harp system now includes charge density calculations for the target, and a new system has been created to collect data for the beam accounting and present the data over the web and to the operator consoles. The majority of the SNS beam instruments are PC-based and their configuration files are now managed through the Oracle relational database. A new version for the wire scanner software was developed to add features to correlate the scan with beam loss, parking in the beam, and measuring the longitudinal beam current. This software is currently being tested. This paper also includes data from the selected instruments.

Blokland, Willem [ORNL; Purcell, J David [ORNL; Patton, Jeff [ORNL; Pelaia II, Tom [ORNL; Sundaram, Madhan [ORNL; Pennisi, Terry R [ORNL

2007-01-01

102

Spacelab Life Sciences-1 electrical diagnostics expert system  

NASA Technical Reports Server (NTRS)

The Spacelab Life Sciences-1 (SLS-1) Electrical Diagnostic (SLED) expert system is a continuous real time knowledge-based system to monitor and diagnose electrical system problems in the Spacelab. After fault isolation, the SLED system provides corrective procedures and advice to the ground-based console operator. The SLED system updates its knowledge about the status of Spacelab every 3 seconds. The system supports multiprocessing of malfunctions and allows multiple failures to be handled simultaneously. Information which is readily available via a mouse click includes: general information about the system and each component, the electrical schematics, the recovery procedures of each malfunction, and an explanation of the diagnosis.

Kao, Cheng Y.; Morris, William S.

1989-01-01

103

Spacelab Life Sciences-1 electrical diagnostic expert system  

NASA Technical Reports Server (NTRS)

The Spacelab Life Sciences-1 (SLS-1) Electrical Diagnostic (SLED) expert system is a continuous, real time knowledge-based system to monitor and diagnose electrical system problems in the Spacelab. After fault isolation, the SLED system provides corrective procedures and advice to the ground-based console operator. The SLED system updates its knowledge about the status of Spacelab every 3 seconds. The system supports multiprocessing of malfunctions and allows multiple failures to be handled simultaneously. Information which is readily available via a mouse click includes: general information about the system and each component, the electrical schematics, the recovery procedures of each malfunction, and an explanation of the diagnosis.

Kao, C. Y.; Morris, W. S.

1989-01-01

104

Spitzer Telemetry Processing System  

NASA Technical Reports Server (NTRS)

The Spitzer Telemetry Processing System (SirtfTlmProc) was designed to address objectives of JPL's Multi-mission Image Processing Lab (MIPL) in processing spacecraft telemetry and distributing the resulting data to the science community. To minimize costs and maximize operability, the software design focused on automated error recovery, performance, and information management. The system processes telemetry from the Spitzer spacecraft and delivers Level 0 products to the Spitzer Science Center. SirtfTlmProc is a unique system with automated error notification and recovery, with a real-time continuous service that can go quiescent after periods of inactivity. The software can process 2 GB of telemetry and deliver Level 0 science products to the end user in four hours. It provides analysis tools so the operator can manage the system and troubleshoot problems. It automates telemetry processing in order to reduce staffing costs.

Stanboli, Alice; Martinez, Elmain M.; McAuley, James M.

2013-01-01

105

Data mining based full ceramic bearing fault diagnostic system using AE sensors.  

PubMed

Full ceramic bearings are considered the first step toward full ceramic, oil-free engines in the future. No research on full ceramic bearing fault diagnostics using acoustic emission (AE) sensors has been reported. Unlike their steel counterparts, signal processing methods to extract effective AE fault characteristic features and fault diagnostic systems for full ceramic bearings have not been developed. In this paper, a data mining based full ceramic bearing diagnostic system using AE based condition indicators (CIs) is presented. The system utilizes a new signal processing method based on Hilbert Huang transform to extract AE fault features for the computation of CIs. These CIs are used to build a data mining based fault classifier using a k-nearest neighbor algorithm. Seeded fault tests on full ceramic bearing outer race, inner race, balls, and cage are conducted on a bearing diagnostic test rig and AE burst data are collected. The effectiveness of the developed fault diagnostic system is validated using real full ceramic bearing seeded fault test data. PMID:21990335

He, David; Li, Ruoyu; Zhu, Junda; Zade, Mikhail

2011-12-01

106

Advanced diagnostics and instrumentation for chemically reactive systems  

Microsoft Academic Search

Progress is reported for the first year of an interdisciplinary program to investigate and develop modern diagnostic techniques for application to reacting flows. Project areas include: (1) development and application of optical probes for species measurements employing tunable ultraviolet, visible and infrared laser sources; (2) development and application of a coherent anti-Stokes Raman spectroscopy (CARS) system for temperature and velocity

R. K. Hanson; D. Baganoff; C. T. Bowman; R. L. Byer; B. J. Cantwell; S. A. Self

1981-01-01

107

Summer School Diagnostics and Prognostics of Fuel Cell Systems  

E-print Network

registration, 200 ) includes: Summer School facilities; Proceedings (hard copy); Coffee breaks, daily lunches of the summer school 10h00-12h30 Hydrogen vector and Fuel Cell technology Lunch 14h00-16h00 DegradationANR PROPICE Summer School Diagnostics and Prognostics of Fuel Cell Systems 01-04 July 2014, FCLAB

Jeanjean, Louis

108

Computer assisted diagnostic system in tumor radiography.  

PubMed

An improved and efficient method is presented in this paper to achieve a better trade-off between noise removal and edge preservation, thereby detecting the tumor region of MRI brain images automatically. Compass operator has been used in the fourth order Partial Differential Equation (PDE) based denoising technique to preserve the anatomically significant information at the edges. A new morphological technique is also introduced for stripping skull region from the brain images, which consequently leading to the process of detecting tumor accurately. Finally, automatic seeded region growing segmentation based on an improved single seed point selection algorithm is applied to detect the tumor. The method is tested on publicly available MRI brain images and it gives an average PSNR (Peak Signal to Noise Ratio) of 36.49. The obtained results also show detection accuracy of 99.46%, which is a significant improvement than that of the existing results. PMID:23504472

Faisal, Ahmed; Parveen, Sharmin; Badsha, Shahriar; Sarwar, Hasan; Reza, Ahmed Wasif

2013-06-01

109

Diagnostic Performance of Electronic Syndromic Surveillance Systems in Acute Care  

PubMed Central

Context Healthcare Electronic Syndromic Surveillance (ESS) is the systematic collection, analysis and interpretation of ongoing clinical data with subsequent dissemination of results, which aid clinical decision-making. Objective To evaluate, classify and analyze the diagnostic performance, strengths and limitations of existing acute care ESS systems. Data Sources All available to us studies in Ovid MEDLINE, Ovid EMBASE, CINAHL and Scopus databases, from as early as January 1972 through the first week of September 2012. Study Selection: Prospective and retrospective trials, examining the diagnostic performance of inpatient ESS and providing objective diagnostic data including sensitivity, specificity, positive and negative predictive values. Data Extraction Two independent reviewers extracted diagnostic performance data on ESS systems, including clinical area, number of decision points, sensitivity and specificity. Positive and negative likelihood ratios were calculated for each healthcare ESS system. A likelihood matrix summarizing the various ESS systems performance was created. Results The described search strategy yielded 1639 articles. Of these, 1497 were excluded on abstract information. After full text review, abstraction and arbitration with a third reviewer, 33 studies met inclusion criteria, reporting 102,611 ESS decision points. The yielded I2 was high (98.8%), precluding meta-analysis. Performance was variable, with sensitivities ranging from 21% –100% and specificities ranging from 5%-100%. Conclusions There is significant heterogeneity in the diagnostic performance of the available ESS implements in acute care, stemming from the wide spectrum of different clinical entities and ESS systems. Based on the results, we introduce a conceptual framework using a likelihood ratio matrix for evaluation and meaningful application of future, frontline clinical decision support systems. PMID:23874359

Kashiouris, M.; O'Horo, J.C.; Pickering, B.W.; Herasevich, V.

2013-01-01

110

Examination of Parental Attitudes Within the Diagnostic Intervention Process.  

ERIC Educational Resources Information Center

Recognizing that affective factors related to learning can be measured and that attitude influences learning, this study investigated the relationship between parental attitudes and children's reading ability. A short form, self report parent questionnaire was administered to 107 sets of parents whose children had been referred to a diagnostic

Harmer, William R.; Harrison, Jacquelyn A.

111

Industrial process surveillance system  

DOEpatents

A system and method are disclosed for monitoring an industrial process and/or industrial data source. The system includes generating time varying data from industrial data sources, processing the data to obtain time correlation of the data, determining the range of data, determining learned states of normal operation and using these states to generate expected values, comparing the expected values to current actual values to identify a current state of the process closest to a learned, normal state; generating a set of modeled data, and processing the modeled data to identify a data pattern and generating an alarm upon detecting a deviation from normalcy. 96 figs.

Gross, K.C.; Wegerich, S.W.; Singer, R.M.; Mott, J.E.

1998-06-09

112

An Intelligent Integrated System Scheme for Machine Tool Diagnostics  

Microsoft Academic Search

The technology of neural networks and expert systems are finding increasing applications in the field of machine tool diagnostics.\\u000a In this paper, the advantages and disadvantages of these methods are analysed and compared. An intelligent integrated diagnosis\\u000a system based on a combination of the two methods is presented. This scheme aims to exploit the advantages and avoid the disadvantages\\u000a of

W. Hu; A. Starr; Z. Zhou; A. Leung

2001-01-01

113

A Scalable, Out-of-Band Diagnostics Architecture for International Space Station Systems Support  

NASA Technical Reports Server (NTRS)

The computational infrastructure of the International Space Station (ISS) is a dynamic system that supports multiple vehicle subsystems such as Caution and Warning, Electrical Power Systems and Command and Data Handling (C&DH), as well as scientific payloads of varying size and complexity. The dynamic nature of the ISS configuration coupled with the increased demand for payload support places a significant burden on the inherently resource constrained computational infrastructure of the ISS. Onboard system diagnostics applications are hosted on computers that are elements of the avionics network while ground-based diagnostic applications receive only a subset of available telemetry, down-linked via S-band communications. In this paper we propose a scalable, out-of-band diagnostics architecture for ISS systems support that uses a read-only connection for C&DH data acquisition, which provides a lower cost of deployment and maintenance (versus a higher criticality readwrite connection). The diagnostics processing burden is off-loaded from the avionics network to elements of the on-board LAN that have a lower overall cost of operation and increased computational capacity. A superset of diagnostic data, richer in content than the configured telemetry, is made available to Advanced Diagnostic System (ADS) clients running on wireless handheld devices, affording the crew greater mobility for troubleshooting and providing improved insight into vehicle state. The superset of diagnostic data is made available to the ground in near real-time via an out-of band downlink, providing a high level of fidelity between vehicle state and test, training and operational facilities on the ground.

Fletcher, Daryl P.; Alena, Rick; Clancy, Daniel (Technical Monitor)

2002-01-01

114

Process evaluation distributed system  

NASA Technical Reports Server (NTRS)

The distributed system includes a database server, an administration module, a process evaluation module, and a data display module. The administration module is in communication with the database server for providing observation criteria information to the database server. The process evaluation module is in communication with the database server for obtaining the observation criteria information from the database server and collecting process data based on the observation criteria information. The process evaluation module utilizes a personal digital assistant (PDA). A data display module in communication with the database server, including a website for viewing collected process data in a desired metrics form, the data display module also for providing desired editing and modification of the collected process data. The connectivity established by the database server to the administration module, the process evaluation module, and the data display module, minimizes the requirement for manual input of the collected process data.

Moffatt, Christopher L. (Inventor)

2006-01-01

115

Information Processing Digital Systems  

E-print Network

. · The process of conversion is known as Digitization or Quantization. · Analog-to-digital-converters (ADC information processing and representation are clarified. These include: 1. "Analog" versus "Digital" parameters and systems. 2. Digitization of "Analog" signals. 3. Digital representation of information. 4

Bouhraoua, Abdelhafid

116

Confirming Diagnosis of Hazardous and Harmful Alcohol Use Diagnostic accuracy of a computer assisted diagnostic system compared to conventional  

E-print Network

populations: 67 treatment seeking alcoholics, 68 non- treatment seeking heavy drinkers and 47 controls1 TITLE PAGE Confirming Diagnosis of Hazardous and Harmful Alcohol Use Diagnostic accuracy of a computer assisted diagnostic system compared to conventional markers of alcoholism. Aleksander Korzec, MD

van Lambalgen, Michiel

117

Expert systems in the process industries  

NASA Technical Reports Server (NTRS)

This paper gives an overview of industrial applications of real-time knowledge based expert systems (KBES's) in the process industries. After a brief overview of the features of a KBES useful in process applications, the general roles of KBES's are covered. A particular focus is diagnostic applications, one of the major applications areas. Many applications are seen as an expansion of supervisory control. The lessons learned from numerous online applications are summarized.

Stanley, G. M.

1992-01-01

118

Pre-PCR processing in bioterrorism preparedness: improved diagnostic capabilities for laboratory response networks.  

PubMed

Diagnostic DNA analysis using polymerase chain reaction (PCR) has become a valuable tool for rapid detection of biothreat agents. However, analysis is often challenging because of the limited size, quality, and purity of the biological target. Pre-PCR processing is an integrated concept in which the issues of analytical limit of detection and simplicity for automation are addressed in all steps leading up to PCR amplification--that is, sampling, sample treatment, and the chemical composition of PCR. The sampling method should maximize target uptake and minimize uptake of extraneous substances that could impair the analysis--so-called PCR inhibitors. In sample treatment, there is a trade-off between yield and purity, as extensive purification leads to DNA loss. A cornerstone of pre-PCR processing is to apply DNA polymerase-buffer systems that are tolerant to specific sample impurities, thereby lowering the need for expensive purification steps and maximizing DNA recovery. Improved awareness among Laboratory Response Networks (LRNs) regarding pre-PCR processing is important, as ineffective sample processing leads to increased cost and possibly false-negative or ambiguous results, hindering the decision-making process in a bioterrorism crisis. This article covers the nature and mechanisms of PCR-inhibitory substances relevant for agroterrorism and bioterrorism preparedness, methods for quality control of PCR reactions, and applications of pre-PCR processing to optimize and simplify the analysis of various biothreat agents. Knowledge about pre-PCR processing will improve diagnostic capabilities of LRNs involved in the response to bioterrorism incidents. PMID:23971826

Hedman, Johannes; Knutsson, Rickard; Ansell, Ricky; Rådström, Peter; Rasmusson, Birgitta

2013-09-01

119

Magnetic diagnostic system of the DIII-D tokamak  

NASA Astrophysics Data System (ADS)

External measurements of the magnetic field surrounding a hot, magnetically confined plasma yield important information about the state of the plasma, since the external field is generated in part by electric currents within the plasma itself. Therefore, magnetic diagnostics are an essential part of both the operation and the physics experiments in tokamaks and other magnetic confinement devices. The magnetic diagnostic system of the DIII-D tokamak includes approximately 250 inductive sensors of various types: axisymmetric poloidal flux loops, diamagnetic-flux loops, magnetic probes and saddle loops for the measurement of local magnetic field, and Rogowski loops for the measurement of coil currents and plasma current. The primary uses of the data include plasma shape and position control with a real-time digital control system, postdischarge equilibrium reconstruction, spectrum analysis in time and space of plasma instabilities, and direct feedback control of slowly growing instabilities. The sensors, instrumentation, calibration, applications, and operating experience are described.

Strait, E. J.

2006-02-01

120

Realizing Net-Centric Diagnostics Within the Naval Maintenance System  

Microsoft Academic Search

The U.S. Navy's current implementation of the three-level maintenance philosophy achieves mission readiness. However, there are inefficiencies in the maintenance system which waste resources and manpower. These inefficiencies may be overcome by facilitating improved testing capabilities and data sharing between the Organizational level of maintenance (O-level) and the Intermediate level (l-level) and\\/or Depot (D-level). The Integrated Diagnostics and Automated Test

Russell Shannon; J. Quiter; A. D'Annunzio; R. Meseroll; G. Edwards; C. Koepping

2006-01-01

121

ISABELLE accelerator software, control system, and beam diagnostic philosophy  

SciTech Connect

The ISABELLE Project combines two large proton accelerators with two storage rings in the same facility using superconducting magnet technology. This combination leads to severe constraints on beam loss in magnets and involves complex treatment of magnetic field imperfections and correction elements. The consequent demands placed upon beam diagnostics, accelerator model programs, and the computer oriented control system are discussed in terms of an illustrative operation scenario.

Cornacchia, M.; Humphrey, J.W.; Niederer, J.; Poole, J.H.

1981-01-01

122

The graphics-based human interface to the DISYS diagnostic/control guidance system at EBR-2  

SciTech Connect

An initial graphics based interface to the real-time DISYS diagnostic system has been developed using the multi-tasking capabilities of the UNIX operating system and X-Windows 11 Xlib graphics library. This system is interfaced to live plant data at the Experimental Breeder Reactor (EBR-2) for the Argon Cooling System of fuel handling operations and the steam plant. The interface includes an intelligent process schematic which highlights problematic components and sensors based on the results of the diagnostic computations. If further explanation of a faulted component is required, the user can call up a display of the diagnostic computations presented in a tree-like diagram. Numerical data on the process schematic and optional diagnostic tree are updated as new real-time data becomes available. The initial X-Windows 11 based interface will be further enhanced using VI Corporation DATAVIEWS graphical data base software. 5 refs., 6 figs.

Edwards, R.M.; Chavez, C.; Kamarthi, S.; Dharap, S. (Pennsylvania State Univ., University Park, PA (USA)); Lindsay, R.W.; Staffon, J. (Argonne National Lab., IL (USA))

1990-01-01

123

An SSME high pressure oxidizer turbopump diagnostic system using G2(TM) real-time expert system  

NASA Technical Reports Server (NTRS)

An expert system which diagnoses various seal leakage faults in the High Pressure Oxidizer Turbopump of the SSME was developed using G2(TM) real-time expert system. Three major functions of the software were implemented: model-based data generation, real-time expert system reasoning, and real-time input/output communication. This system is proposed as one module of a complete diagnostic system for Space Shuttle Main Engine. Diagnosis of a fault is defined as the determination of its type, severity, and likelihood. Since fault diagnosis is often accomplished through the use of heuristic human knowledge, an expert system based approach was adopted as a paradigm to develop this diagnostic system. To implement this approach, a software shell which can be easily programmed to emulate the human decision process, the G2 Real-Time Expert System, was selected. Lessons learned from this implementation are discussed.

Guo, Ten-Huei

1991-01-01

124

Abstract--A reconfiguration technique for multilevel inverters incorporating a diagnostic system based on neural  

E-print Network

Abstract-- A reconfiguration technique for multilevel inverters incorporating a diagnostic system based on neural network is proposed in this paper. It is difficult to diagnose a multilevel-inverter. Index Terms-- Diagnostic system, fault diagnosis, multilevel inverter, neural network, reconfiguration

Tolbert, Leon M.

125

Model-Based Diagnostic decision-support system for satellites  

NASA Astrophysics Data System (ADS)

We propose a novel framework for Model-Based Diagnosis (MBD) that uses active testing to decrease the diagnostic uncertainty. This framework is called LYDIA-NG and combines several diagnostic, simulation, and active-testing algorithms. We have illustrated the workings of LYDIA-NG by building a LYDIA-NG-based decision support system for the Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite. This paper discusses a model of the GOCE Electrical Power System (EPS), the algorithms for diagnosis and disambiguation, and the experiments performed with a number of diagnostic scenarios. Our experiments produced no false positive scenarios, no false negative scenarios, the average number of classification errors per scenario is 1.25, and the fault detection time is equal to the computation time. We have further computed an average fault uncertainty of 2.06 × 10- 3 which can be automatically reduced to 9.5× 10- 4 by sending a single, automatically computed, telecommand, thus dramatically reducing the fault isolation time.

Feldman, Alexander; de Castro, Helena Vicente; van Gemund, Arjan; Provan, Gregory

126

Evaluation of the NDP (neutron diagnostic probe) system  

SciTech Connect

The neutron diagnostic probe (NDP), an explosive detection system developed by Consolidated Controls Corporation and based on the associated-alpha-particle technique, was evaluated. Although many problems were found with the prototype system that make it useless for most practical applications, the NDP system may be considered a successful proof-of-principle for the basic explosive detection system design. In addition to evaluating the design and performance of the present system, models were developed to estimate the performance that might reasonably be expected from full scale systems of different conceptual design. Specific examples involved various types of bulk and sheet explosives contained in a suitcase and a large crate. Also considered were the effects of innocuous materials surrounding explosives in different scenarios, including the deliberate use of shielding materials as a countermeasure to detection. 11 refs., 46 figs., 24 tabs.

Pentaleri, E.A.; Eisen, Y.Y.

1990-12-01

127

Defining and exploring properties in diagnostic systems Nuno Belard 1 2 3  

E-print Network

@laas.fr ABSTRACT Every model-based diagnostic approach relies on a representation of a real-world system the real- world system to generate a diagnostic problem to be solved. In this paper it is firstly argued the believed and the real systems is pro- posed. 1 INTRODUCTION Diagnostic reasoning aims at determining

Pencolé, Yannick

128

Medial prefrontal dissociations during processing of trait diagnostic and nondiagnostic person information  

Microsoft Academic Search

Previous research has suggested that perceivers spontaneously extract trait-specific information from the behaviour of others. However, little is known about whether perceivers spontaneously engage in the same depth of social-cognitive processing for all person information or reserve such processing specifically for information that conveys diagnostic clues about another person's dispositions. Moreover, a question remains as to whether the processing of

Jason P. Mitchell; Jasmin Cloutier; Mahzarin R. Banaji; C. Neil Macrae

2006-01-01

129

System diagnostic builder: a rule-generation tool for expert systems that do intelligent data evaluation  

NASA Astrophysics Data System (ADS)

The system diagnostic builder (SDB) is an automated knowledge acquisition tool using state- of-the-art artificial intelligence (AI) technologies. The SDB uses an inductive machine learning technique to generate rules from data sets that are classified by a subject matter expert (SME). Thus, data is captured from the subject system, classified by an expert, and used to drive the rule generation process. These rule-bases are used to represent the observable behavior of the subject system, and to represent knowledge about this system. The rule-bases can be used in any knowledge based system which monitors or controls a physical system or simulation. The SDB has demonstrated the utility of using inductive machine learning technology to generate reliable knowledge bases. In fact, we have discovered that the knowledge captured by the SDB can be used in any number of applications. For example, the knowledge bases captured from the SMS can be used as black box simulations by intelligent computer aided training devices. We can also use the SDB to construct knowledge bases for the process control industry, such as chemical production, or oil and gas production. These knowledge bases can be used in automated advisory systems to ensure safety, productivity, and consistency.

Nieten, Joseph L.; Burke, Roger

1993-03-01

130

ORION OPTICAL DIAGNOSTIC SYSTEMS Construction and commissioning progress  

NASA Astrophysics Data System (ADS)

The Orion facility provides a unique combined long- and short-pulse laser capability. We report on the progress in constructing a comprehensive plasma optical diagnostic suite for the facility, developed for a range of warm dense matter and other materials' properties experiments. The first VISAR imaging line for the suite is due to be commissioned in 2012 and its progress will be reported. The system consists of configurable optical elements mounted on a TIM, relay optics to an optical table, optics to direct the light through a VISAR bed onto an optical streak camera and the infrastructure systems to provide remote control and services. Due to the operational model of Orion the diagnostic must have comprehensive remote control for its set up and alignment. This makes the system design more complicated than otherwise. The sub-systems required to give the degree of remote control required will be described. A modified version of the suite's ASBO imaging line was used in 2011 to support the commissioning of Orion's long- and short-pulse laser beam lines by imaging optical emission from laser targets. The set up of this system and the data it recorded with an optical streak camera during a short pulse experiment will be presented.

Palmer, J. B. A.; Drew, D.; Fyrth, J.; Hill, M. P.; Kemshall, P.; Oades, K.; Harvey, E.; Gumbrell, E. T.

2012-10-01

131

The Rare Earth Peak : An Overlooked r-Process Diagnostic  

E-print Network

The astrophysical site or sites responsible for the r-process of nucleosynthesis still remains an enigma. Since the rare earth region is formed in the latter stages of the r-process it provides a unique probe of the astrophysical conditions during which the r-process takes place. We use features of a successful rare earth region in the context of a high entropy r-process (S>100k_B) and discuss the types of astrophysical conditions that produce abundance patterns that best match meteoritic and observational data. Despite uncertainties in nuclear physics input, this method effectively constrains astrophysical conditions.

M. Mumpower; G. McLaughlin; R. Surman

2012-02-08

132

THE RARE EARTH PEAK: AN OVERLOOKED r-PROCESS DIAGNOSTIC  

SciTech Connect

The astrophysical site or sites responsible for the r-process of nucleosynthesis still remains an enigma. Since the rare earth region is formed in the latter stages of the r-process, it provides a unique probe of the astrophysical conditions during which the r-process takes place. We use features of a successful rare earth region in the context of a high-entropy r-process (S {approx}> 100k{sub B} ) and discuss the types of astrophysical conditions that produce abundance patterns that best match meteoritic and observational data. Despite uncertainties in nuclear physics input, this method effectively constrains astrophysical conditions.

Mumpower, Matthew R.; McLaughlin, G. C. [Department of Physics, North Carolina State University, Raleigh, NC 27695-8202 (United States); Surman, Rebecca, E-mail: mrmumpow@ncsu.edu, E-mail: gail_mclaughlin@ncsu.edu, E-mail: surmanr@union.edu [Department of Physics and Astronomy, Union College, Schenectady, NY 12308 (United States)

2012-06-20

133

Development of an intelligent diagnostic system for reusable rocket engine control  

NASA Technical Reports Server (NTRS)

A description of an intelligent diagnostic system for the Space Shuttle Main Engines (SSME) is presented. This system is suitable for incorporation in an intelligent controller which implements accommodating closed-loop control to extend engine life and maximize available performance. The diagnostic system architecture is a modular, hierarchical, blackboard system which is particularly well suited for real-time implementation of a system which must be repeatedly updated and extended. The diagnostic problem is formulated as a hierarchical classification problem in which the failure hypotheses are represented in terms of predefined data patterns. The diagnostic expert system incorporates techniques for priority-based diagnostics, the combination of analytical and heuristic knowledge for diagnosis, integration of different AI systems, and the implementation of hierarchical distributed systems. A prototype reusable rocket engine diagnostic system (ReREDS) has been implemented. The prototype user interface and diagnostic performance using SSME test data are described.

Anex, R. P.; Russell, J. R.; Guo, T.-H.

1991-01-01

134

Optical Diagnostic System for Solar Sails: Phase 1 Final Report  

NASA Technical Reports Server (NTRS)

NASA's In-Space Propulsion program recently selected AEC-ABLE Engineering and L'Garde, Inc. to develop scale-model solar sail hardware and demonstrate its functionality on the ground. Both are square sail designs with lightweight diagonal booms (<100 g/m) and ultra-thin membranes (<10 g/sq m). To support this technology, the authors are developing an integrated diagnostics instrumentation package for monitoring solar sail structures such as these in a near-term flight experiment. We refer to this activity as the "Optical Diagnostic System (ODS) for Solar Sails" project. The approach uses lightweight optics and photogrammetric techniques to measure solar sail membrane and boom shape and dynamics, thermography to map temperature, and non-optical sensors including MEMS accelerometers and load cells. The diagnostics package must measure key structural characteristics including deployment dynamics, sail support tension, boom and sail deflection, boom and sail natural frequencies, sail temperature, and sail integrity. This report summarizes work in the initial 6-month Phase I period (conceptual design phase) and complements the final presentation given in Huntsville, AL on January 14, 2004.

Pappa, Richard S.; Blandino, Joseph R.; Caldwell, Douglas W.; Carroll, Joseph A.; Jenkins, Christopher H. M.; Pollock, Thomas C.

2004-01-01

135

Medial prefrontal dissociations during processing of trait diagnostic and nondiagnostic person information  

PubMed Central

Previous research has suggested that perceivers spontaneously extract trait-specific information from the behaviour of others. However, little is known about whether perceivers spontaneously engage in the same depth of social-cognitive processing for all person information or reserve such processing specifically for information that conveys diagnostic clues about another person's dispositions. Moreover, a question remains as to whether the processing of such nondiagnostic information can be affected by perceivers’ explicit goal to consider another's dispositions or not. To examine processing of diagnostic and nondiagnostic social information as a function of perceivers’ explicit social-cognitive goals, participants underwent functional magnetic resonance imaging (fMRI) scanning while performing social (impression formation) or non-social orienting tasks using statements that conveyed either diagnostic or nondiagnostic information about the target's personality traits. Replicating two earlier studies, results identified a region of dorsal medial prefrontal cortex (mPFC) that was preferentially activated by impression formation. Interestingly, no difference between trait-diagnostic and nondiagnostic information was observed when participants had the explicit goal of forming an impression, but a substantial effect of diagnosticity emerged when task instructions oriented them away from considering the target as a social agent. These results suggest that trait-nondiagnostic information is not subject to spontaneous social-cognitive processing, but that such processing may nevertheless occur when perceivers have the explicit goal to use that information to form an impression of a target. PMID:18985100

Mitchell, Jason P.; Cloutier, Jasmin; Banaji, Mahzarin R.; Macrae, C. Neil

2006-01-01

136

Systemic lupus erythematosus diagnostics in the 'omics' era  

PubMed Central

Systemic lupus erythematosus is a complex autoimmune disease affecting multiple organ systems. Currently, diagnosis relies upon meeting at least four out of eleven criteria outlined by the ACR. The scientific community actively pursues discovery of novel diagnostics in the hope of better identifying susceptible individuals in early stages of disease. Comprehensive studies have been conducted at multiple biological levels including: DNA (or genomics), mRNA (or transcriptomics), protein (or proteomics) and metabolites (or metabolomics). The ‘omics’ platforms allow us to re-examine systemic lupus erythematosus at a greater degree of molecular resolution. More importantly, one is hopeful that these ‘omics’ platforms may yield newer biomarkers for systemic lupus erythematosus that can help clinicians track the disease course with greater sensitivity and specificity. PMID:24860621

Arriens, Cristina; Mohan, Chandra

2014-01-01

137

Flight Test of Propulsion Monitoring and Diagnostic System  

NASA Technical Reports Server (NTRS)

The objective of this program was to perform flight tests of the propulsion monitoring and diagnostic system (PMDS) technology concept developed by Honeywell under the NASA Advanced General Aviation Transport Experiment (AGATE) program. The PMDS concept is intended to independently monitor the performance of the engine, providing continuous status to the pilot along with warnings if necessary as well as making the data available to ground maintenance personnel via a special interface. These flight tests were intended to demonstrate the ability of the PMDS concept to detect a class of selected sensor hardware failures, and the ability to successfully model the engine for the purpose of engine diagnosis.

Gabel, Steve; Elgersma, Mike

2002-01-01

138

TV-acquired optical diagnostics systems on ATA  

SciTech Connect

The purpose of this paper is to report on optical system developments on the ATA and their applications to ATA beam characterization. Television (TV)-acquired optical diagnostics data provide spatial and temporal properties of the ATA beam that complements recorded information from other types of sensors, such as, beam-wall current monitors, x-ray probes, and rf probes. The ATA beam operates: (1) in the normal mode at 50-MeV, 10-kA at a 1-Hz rate; and (2) in the 1-KHz burst mode (for 10-pulses) at a 0.5 Hz rate. The beam has a 70-ns pulse width in vacuum propagation; however, beam-head erosion will occur in atmospheric propagation, thus limiting the pulse width to less than 50-ns. Various optical systems are used for ATA diagnostics. Optical-imaging provides a convenient measurement in a single pulse of the 2-dimensional profile of the beam intensity. It can also provide multiple 2-D framing in a single pulse. In some studies it may be desirable to study optical events with temporal resolution less than 100-ps with 1-dimensional streak cameras. Spatially integrated data from phototube cameras can also be used for background measurement applications as well as for single pixel monitoring. The optical line-of-sight (LOS) configurations have been made versatile to accommodate a large number of options for the various optical systems.

Kalibjian, R.; Chong, Y.P.; Cornish, J.P.; Jackson, C.H.; Fessenden, T.J.

1984-06-01

139

Aerospike Engine Post-Test Diagnostic System Delivered to Rocketdyne  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center at Lewis Field, in cooperation with Rocketdyne, has designed, developed, and implemented an automated Post-Test Diagnostic System (PTDS) for the X-33 linear aerospike engine. The PTDS was developed to reduce analysis time and to increase the accuracy and repeatability of rocket engine ground test fire and flight data analysis. This diagnostic system provides a fast, consistent, first-pass data analysis, thereby aiding engineers who are responsible for detecting and diagnosing engine anomalies from sensor data. It uses analytical methods modeled after the analysis strategies used by engineers. Glenn delivered the first version of PTDS in September of 1998 to support testing of the engine s power pack assembly. The system was used to analyze all 17 power pack tests and assisted Rocketdyne engineers in troubleshooting both data acquisition and test article anomalies. The engine version of PTDS, which was delivered in June of 1999, will support all single-engine, dual-engine, and flight firings of the aerospike engine.

Meyer, Claudia M.

2000-01-01

140

Criteria Combinations in the Personality Disorders: Challenges Associated with a Polythetic Diagnostic System  

E-print Network

Converging research on the diagnostic criteria for personality disorders (PDs) reveals that most criteria have different psychometric properties. This finding is inconsistent with the DSM-IV-TR PD diagnostic system, which weights each criterion...

Cooper, Luke D.

2011-08-08

141

Using hypermedia to develop an intelligent tutorial/diagnostic system for the Space Shuttle Main Engine Controller Lab  

NASA Technical Reports Server (NTRS)

This is a tutorial/diagnostic system for training personnel in the use of the Space Shuttle Main Engine Controller (SSMEC) Simulation Lab. It also provides a diagnostic capable of isolating lab failures at least to the major lab component. The system was implemented using Hypercard, which is an program of hypermedia running on Apple Macintosh computers. Hypercard proved to be a viable platform for the development and use of sophisticated tutorial systems and moderately capable diagnostic systems. This tutorial/diagnostic system uses the basic Hypercard tools to provide the tutorial. The diagnostic part of the system uses a simple interpreter written in the Hypercard language (Hypertalk) to implement the backward chaining rule based logic commonly found in diagnostic systems using Prolog. Some of the advantages of Hypercard in developing this type of system include sophisticated graphics, animation, sound and voice capabilities, its ability as a hypermedia tool, and its ability to include digitized pictures. The major disadvantage is the slow execution time for evaluation of rules (due to the interpretive processing of the language). Other disadvantages include the limitation on the size of the cards, that color is not supported, that it does not support grey scale graphics, and its lack of selectable fonts for text fields.

Oreilly, Daniel; Williams, Robert; Yarborough, Kevin

1988-01-01

142

FTDD973: A multimedia knowledge-based system and methodology for operator training and diagnostics  

NASA Technical Reports Server (NTRS)

FTDD973 (973 Fabricator Training, Documentation, and Diagnostics) is an interactive multimedia knowledge based system and methodology for computer-aided training and certification of operators, as well as tool and process diagnostics in IBM's CMOS SGP fabrication line (building 973). FTDD973 is an example of what can be achieved with modern multimedia workstations. Knowledge-based systems, hypertext, hypergraphics, high resolution images, audio, motion video, and animation are technologies that in synergy can be far more useful than each by itself. FTDD973's modular and object-oriented architecture is also an example of how improvements in software engineering are finally making it possible to combine many software modules into one application. FTDD973 is developed in ExperMedia/2; and OS/2 multimedia expert system shell for domain experts.

Hekmatpour, Amir; Brown, Gary; Brault, Randy; Bowen, Greg

1993-01-01

143

Parents' Experience of the Diagnostic Process for Autistic Spectrum Disorders  

ERIC Educational Resources Information Center

Parental perceptions of receiving a diagnosis for their child have been widely researched, with results suggesting high levels of dissatisfaction. Such research has focused upon diagnoses such as Down syndrome and cerebral palsy, and has often looked specifically at the disclosure of a diagnosis. There is limited research looking at the process

Braiden, Hannah-Jane; Bothwell, Janice; Duffy, Joe

2010-01-01

144

Context-Processing Deficits in Schizophrenia: Diagnostic Specificity, 4-Week Course, and Relationships to Clinical Symptoms  

E-print Network

Context-Processing Deficits in Schizophrenia: Diagnostic Specificity, 4-Week Course of Pittsburgh and Princeton University Previous research on schizophrenia suggests that context-processing disturbances are one of the core cognitive deficits present in schizophrenia. However, it is not clear whether

145

Plasma Diagnostics For The Investigation of Silane Based Glow Discharge Deposition Processes  

Microsoft Academic Search

In this work is presented the study of microcrystalline silicon PECVD process through highly diluted silane in hydrogen discharges. The investigation is performed by applying different non intrusive plasma diagnostics (electrical, optical, mass spectrometric and laser interferometric measurements). Each of these measurements is related to different plasma sub-processes (gas physics, plasma chemistry and plasma surface interaction) and compose a complete

Dimitrios Mataras

2001-01-01

146

Comparative guide to emerging diagnostic tools for large commercial HVAC systems  

SciTech Connect

This guide compares emerging diagnostic software tools that aid detection and diagnosis of operational problems for large HVAC systems. We have evaluated six tools for use with energy management control system (EMCS) or other monitoring data. The diagnostic tools summarize relevant performance metrics, display plots for manual analysis, and perform automated diagnostic procedures. Our comparative analysis presents nine summary tables with supporting explanatory text and includes sample diagnostic screens for each tool.

Friedman, Hannah; Piette, Mary Ann

2001-05-01

147

Diagnostic behavior of the Wire Arc Plasma spray process  

Microsoft Academic Search

Laser two-focus (L2F) velocimetry has been used to measure particle velocities in the Wire Arc Plasma spray process. Particle velocities were measured for aluminum, stainless steel, and copper feedstock with wire diameters of 1.6 mm and 0.9 mm. The Wire Arc Plasma gun was operated in both a single-gas mode, using air, and in a two-gas mode, using a mixture

K. A. Kowalsky; D. R. Marantz; R. A. Neiser; M. F. Smith

1992-01-01

148

Beyond the diagnostic traits: A collaborative exploratory diagnostic process for dimensions and underpinnings of narcissistic personality disorder.  

PubMed

Narcissistic personality disorder has been challenging to diagnose in psychiatric and general clinical practice. Several circumstances and personality factors related to the nature of pathological narcissism and NPD contribute. NPD is usually a moderately impairing condition, often accompanied by specific capabilities and high level of functioning. Comorbidity of other urgent and recognizable psychiatric conditions, such as mood and substance use disorders or suicidality, can override even significant narcissistic personality functioning. Patients' limited ability to recognize own contribution to problems or impact on other people, their hypersensitivity and defensive reactivity, and compromised ability for self-disclosure, self-reflection, and emotional empathy can make initial evaluations difficult. The aim of this study is to integrate recent clinical and empirical knowledge on the underpinnings of pathological narcissism and narcissistic personality functioning, and distinguish narcissistic self-regulatory patterns that are affecting diagnostic traits. A more flexible, exploratory, and collaborative diagnostic process is proposed that integrates the patients subjective experiences and interpersonal functioning in terms of self-regulation, agency, and traits in a way that is informative and meaningful for both the patient and the clinician. (PsycINFO Database Record (c) 2014 APA, all rights reserved). PMID:25314232

Ronningstam, Elsa

2014-10-01

149

Clementine Sensor Processing System  

NASA Technical Reports Server (NTRS)

The design of the DSPSE Satellite Controller (DSC) is baselined as a single-string satellite controller. The DSC performs two main functions: health and maintenance of the spacecraft; and image capture, storage, and playback. The DSC contains two processors: a radiation-hardened Mil-Std-1750, and a commercial R3000. The Mil-Std-1750 processor performs all housekeeping operations, while the R3000 is mainly used to perform the image processing functions associated with the navigation functions, as well as performing various experiments. The DSC also contains a data handling unit (DHU) used to interface to various spacecraft imaging sensors and to capture, compress, and store selected images onto the solid-state data recorder. The development of the DSC evolved from several key requirements; the DSPSE satellite was to do the following: (1) have a radiation-hardened spacecraft control system and be immune to single-event upsets (SEU's); (2) use an R3000-based processor to run the star tracker software that was developed by SDIO (due to schedule and cost constraints, there was no time to port the software to a radiation-hardened processor); and (3) fly a commercial processor to verify its suitability for use in a space environment. In order to enhance the DSC reliability, the system was designed with multiple processing paths. These multiple processing paths provide for greater tolerance to various component failures. The DSC was designed so that all housekeeping processing functions are performed by either the Mil-Std-1750 processor or the R3000 processor. The image capture and storage is performed either by the DHU or the R3000 processor.

Feldstein, A. A.

1993-01-01

150

Clementine sensor processing system  

NASA Astrophysics Data System (ADS)

The design of the DSPSE Satellite Controller (DSC) is baselined as a single-string satellite controller. The DSC performs two main functions: health and maintenance of the spacecraft; and image capture, storage, and playback. The DSC contains two processors: a radiation-hardened Mil-Std-1750, and a commercial R3000. The Mil-Std-1750 processor performs all housekeeping operations, while the R3000 is mainly used to perform the image processing functions associated with the navigation functions, as well as performing various experiments. The DSC also contains a data handling unit (DHU) used to interface to various spacecraft imaging sensors and to capture, compress, and store selected images onto the solid-state data recorder. The development of the DSC evolved from several key requirements; the DSPSE satellite was to do the following: (1) have a radiation-hardened spacecraft control system and be immune to single-event upsets (SEU's); (2) use an R3000-based processor to run the star tracker software that was developed by SDIO (due to schedule and cost constraints, there was no time to port the software to a radiation-hardened processor); and (3) fly a commercial processor to verify its suitability for use in a space environment. In order to enhance the DSC reliability, the system was designed with multiple processing paths. These multiple processing paths provide for greater tolerance to various component failures. The DSC was designed so that all housekeeping processing functions are performed by either the Mil-Std-1750 processor or the R3000 processor. The image capture and storage is performed either by the DHU or the R3000 processor.

Feldstein, A. A.

151

Diagnostic system for plasma/surface energy transfer characterization  

NASA Astrophysics Data System (ADS)

The knowledge of the effective energy deposited onto a surface by the reactive particles (ions, electrons, metastables, photons, etc.) in plasma processes such as thin-film deposition, sputtering, etching, etc., is of high interest to understand the basic mechanisms of energy transfer. In this article, a diagnostic is developed to directly measure the global energy transferred to surfaces (reactor walls, substrates, material to be modified, etc.) immerged in low-pressure plasmas. The diagnostic is based on a commercial HFM7-Vattel® microsensor, confined in a temperature-controlled substrate holder. The manufacturer calibration specifications are only given for atmospheric pressure. They cannot be used in low-pressure plasma conditions (typically 0.1-20Pa). Thus, for this particular application, a calibration of the microsensor is required. It is performed at various pressures, between vacuum and the ambient, according to the NIST protocol and using a homemade blackbody (BB). It is shown that only curves obtained in vacuum or pressures below 0.1Pa are valuable for a true calibration of the sensor. The others are perturbed by the heating of the gas in the BB surroundings. Measurements carried out in a typical transformer coupled plasma reactor in argon gas are presented. Typically the values are of the order of tens or hundreds of mW /cm2 in our experimental conditions. They are consistent with an estimation of the energy transferred by charged particles (ions and electrons) performed from Langmuir probe characterization of the plasma.

Thomann, A.-L.; Semmar, N.; Dussart, R.; Mathias, J.; Lang, V.

2006-03-01

152

Diagnostic accuracy of an ultrasonic multiple transducer cardiac imaging system  

NASA Technical Reports Server (NTRS)

An ultrasonic multiple-transducer imaging system for intracardiac structure visualization is developed in order to simplify visualization of the human heart in vivo without radiation hazard or invasion of the body. Results of the evaluation of the diagnostic accuracy of the devised system in a clinical setting for adult patients are presented and discussed. Criteria are presented for recognition of mitral valva prolapse, mitral stenosis, pericardial effusion, atrial septal defect, and left ventricular dyssynergy. The probable cause for false-positive and false-negative diagnoses is discussed. However, hypertrophic myopathy and congestive myopathy were unable to be detected. Since only qualitative criteria were used, it was not possible to differentiate patients with left ventricular volume overload from patients without cardiac pathology.

Popp, R. L.; Brown, O. R.; Harrison, D. C.

1975-01-01

153

Mach-Zehnder recording systems for pulsed power diagnostics.  

PubMed

Fiber-optic transmission and recording systems, based on Mach-Zehnder modulators, have been developed and installed at the National Ignition Facility (NIF), and are being developed for other pulsed-power facilities such as the Z accelerator at Sandia, with different requirements. We present the design and performance characteristics for the mature analog links, based on the system developed for the Gamma Reaction History diagnostic at the OMEGA laser and at NIF. For a single detector channel, two Mach-Zehnders are used to provide high dynamic range at the full recording bandwidth with no gaps in the coverage. We present laboratory and shot data to estimate upper limits on the radiation effects as they impact recorded data quality. Finally, we will assess the technology readiness level for mature and developing implementations of Mach-Zehnder links for these environments. PMID:23126893

Miller, E K; Abbott, R Q; McKenna, I; Macrum, G; Baker, D; Tran, V; Rodriguez, E; Kaufman, M I; Tibbits, A; Silbernagel, C T; Waltman, T B; Herrmann, H W; Kim, Y H; Mack, J M; Young, C S; Caldwell, S E; Evans, S C; Sedillo, T J; Stoeffl, W; Grafil, E; Liebman, J; Beeman, B; Watts, P; Carpenter, A; Horsfied, C J; Rubery, M S; Chandler, G A; Torres, J A; Smelser, R M

2012-10-01

154

Mach-Zehnder recording systems for pulsed power diagnostics  

SciTech Connect

Fiber-optic transmission and recording systems, based on Mach-Zehnder modulators, have been developed and installed at the National Ignition Facility (NIF), and are being developed for other pulsed-power facilities such as the Z accelerator at Sandia, with different requirements. We present the design and performance characteristics for the mature analog links, based on the system developed for the Gamma Reaction History diagnostic at the OMEGA laser and at NIF. For a single detector channel, two Mach-Zehnders are used to provide high dynamic range at the full recording bandwidth with no gaps in the coverage. We present laboratory and shot data to estimate upper limits on the radiation effects as they impact recorded data quality. Finally, we will assess the technology readiness level for mature and developing implementations of Mach-Zehnder links for these environments.

Miller, E. K.; Abbott, R. Q.; McKenna, I.; Macrum, G.; Baker, D.; Tran, V.; Rodriguez, E.; Kaufman, M. I.; Tibbits, A.; Silbernagel, C. T.; Waltman, T. B. [National Security Technologies, LLC, Santa Barbara and Livermore, California 93111 (United States); National Security Technologies, LLC, Los Alamos, New Mexico 87544 (United States); and National Security Technologies, LLC, North Las Vegas, Nevada 89193 (United States); Herrmann, H. W.; Kim, Y. H.; Mack, J. M.; Young, C. S.; Caldwell, S. E.; Evans, S. C.; Sedillo, T. J. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Stoeffl, W.; Grafil, E. [Lawrence Livermore National Laboratory, Livermore, California (United States); and others

2012-10-15

155

Computer-Aided Diagnostic System For Mass Survey Chest Images  

NASA Astrophysics Data System (ADS)

In order to support screening of chest radiographs on mass survey, a computer-aided diagnostic system that automatically detects abnormality of candidate images using a digital image analysis technique has been developed. Extracting boundary lines of lung fields and examining their shapes allowed various kind of abnormalities to be detected. Correction and expansion were facilitated by describing the system control, image analysis control and judgement of abnormality in the rule type programing language. In the experiments using typical samples of student's radiograms, good results were obtained for the detection of abnormal shape of lung field, cardiac hypertrophy and scoliosis. As for the detection of diaphragmatic abnormality, relatively good results were obtained but further improvements will be necessary.

Yasuda, Yoshizumi; Kinoshita, Yasuhiro; Emori, Yasufumi; Yoshimura, Hitoshi

1988-06-01

156

Intelligent, Self-Diagnostic Thermal Protection System for Future Spacecraft  

NASA Technical Reports Server (NTRS)

The goal of this project is to provide self-diagnostic capabilities to the thermal protection systems (TPS) of future spacecraft. Self-diagnosis is especially important in thermal protection systems (TPS), where large numbers of parts must survive extreme conditions after weeks or years in space. In-service inspections of these systems are difficult or impossible, yet their reliability must be ensured before atmospheric entry. In fact, TPS represents the greatest risk factor after propulsion for any transatmospheric mission. The concepts and much of the technology would be applicable not only to the Crew Exploration Vehicle (CEV), but also to ablative thermal protection for aerocapture and planetary exploration. Monitoring a thermal protection system on a Shuttle-sized vehicle is a daunting task: there are more than 26,000 components whose integrity must be verified with very low rates of both missed faults and false positives. The large number of monitored components precludes conventional approaches based on centralized data collection over separate wires; a distributed approach is necessary to limit the power, mass, and volume of the health monitoring system. Distributed intelligence with self-diagnosis further improves capability, scalability, robustness, and reliability of the monitoring subsystem. A distributed system of intelligent sensors can provide an assurance of the integrity of the system, diagnosis of faults, and condition-based maintenance, all with provable bounds on errors.

Hyers, Robert W.; SanSoucie, Michael P.; Pepyne, David; Hanlon, Alaina B.; Deshmukh, Abhijit

2005-01-01

157

Fiber optic diagnostic techniques for the electrical discharge machining process  

E-print Network

on both sides of the electrodes . . 27 12 Setup to observe total optical power emitted by the plasma spark along with the current measurements from the machine 34 13 Total setup for measuring the spectrum of light emitted by a tungsten lamp . 14... Detailed view of how the monochrometer is being used in the system. . 37 FIG U RE Page IS Total setup for measuring the spectrum of light emitted by a tungsten lamp with a light chopper set at a low duty cycle. . . . . . . . 38 16 Total setup for measu...

Pillans, Brandon William

2012-06-07

158

Resin processing system  

SciTech Connect

This patent describes a resin processing system for use in chemical decontamination of nuclear reactor primary systems. It comprises a fresh resin supply tank; a batching tank; a fresh resin pump connected to the fresh resin supply tank and the batching tank; a plurality of demineralizers wherein process fluids are demineralized; a resin feed pump connected to the batching tank capable of transporting fresh resin from the batching tank; a movable connection means connecting the resin feed pump to one of the plurality of demineralizers; a sluice water supply tank; a sluice water pump connected to the sluice water supply tank and the plurality of demineralizers; a spent resin storage tank connected to each of the plurality of demineralizers; a recycle pump connected to an outlet of the spent resin storage tank and having a pump outlet connected to the sluice water supply tank; and a screen at the outlet of the spent resin storage tank to retain spent resin within the spent resin storage tank while allowing sluice water to be recycled.

Corpora, G.J.; Schlonski, J.S.; Miller, P.E.; Bauer, F.I.

1992-08-18

159

Transfer between word processing systems  

Microsoft Academic Search

A study was conducted to examine knowledge transfer between word processing systems. The study examined the performance of naive subjects learning to use a word processing system, as well as performance of individuals with word processing experience as they learned to use a new system. Subjects initially familiar with one system carried out a series of tasks on this system

John Karat; Larry Boyes; Scott Weisgerber; Chuck Schafer

1986-01-01

160

Optical relay design for an IR imaging diagnostic system in TJ-II fusion device  

NASA Astrophysics Data System (ADS)

The surroundings of a nuclear fusion reactor experiments the presence of magnetic fields, which affects the performance of any diagnostic optical system located nearby. It is therefore necessary to determine with precision the optimum location for the diagnostic and to design magnetically robust optical imaging systems. The purpose of the present optical diagnostic is to measure the temperature dispersion in the vicinity of the NBI (neutral beam injectors) that heat the confined plasma inside the fusion device. The measure is made by processing the information contained in the images of the objects inside the chamber in the 7 to 16 um far infrared wavelength range, through a F2Ba vacuum viewport window. Our main concern is to design the optical relay from this viewport to the IR sensor, a FPA uncooled microbolometer 320x240px, for different axial distances, with a field of view of 24°x18° and 1.3 mrad of IFOV spatial resolution. The proposed optical relay system includes the use of a reflexive relay (aspheric concave mirrors) and a refractive and imaging camera. The system has being corrected for primary aberrations and optimized to allow a future second optical system working in visible range after the mirrors, by including a dichroic beamsplitter.

Ruiz de Galarreta, Carlota; Manzanares Ituarte, Ana; de la Cal Heusch, Eduardo; Liniers, Macarena; Wolfers, Gilles

2012-12-01

161

Diagnostic omission errors in acute paediatric practice: impact of a reminder system on decision-making  

Microsoft Academic Search

BACKGROUND: Diagnostic error is a significant problem in specialities characterised by diagnostic uncertainty such as primary care, emergency medicine and paediatrics. Despite wide-spread availability, computerised aids have not been shown to significantly improve diagnostic decision-making in a real world environment, mainly due to the need for prolonged system consultation. In this study performed in the clinical environment, we used a

Padmanabhan Ramnarayan; Andrew Winrow; Michael Coren; Vasanta Nanduri; Roger Buchdahl; Benjamin Jacobs; Helen Fisher; Paul M Taylor; Jeremy C Wyatt; Joseph Britto

2006-01-01

162

A systems approach to diagnostic ambiguity reduction in naval avionic systems  

Microsoft Academic Search

There are inefficiencies in the current United States (U.S.) Navy maintenance system. These inefficiencies waste resources and manpower. Platform-level diagnostics is relegated primarily to built-in-test (BIT). However, BIT is not entirely reliable. Enhanced Organizational level (0-level) diagnostic functionality is needed to reduce ambiguities between multiple weapons Replaceable Assemblies (wRA's) and interconnects; thus markedly reducing rates of \\

Russell Shannon; J. Quiter; A. D'Annunzio; R. Meseroll; R. Lebron; V. Sieracki

2005-01-01

163

Diagnostics and performance evaluation of neutron monitoring system detectors  

SciTech Connect

Neutron monitoring detectors used in Boiling Water Reactor (BWR) power range monitoring control systems are typically miniature fission chambers that remain in the core for many years. Pressurized Water Reactors (PWR) also utilize movable miniature fission chambers for neutron flux mapping during power operations. The baseline performance of the detectors must be established at the time of installation and retested periodically during the life of the detector to evaluate its suitability for continued use. This paper reports on the characteristics that the power range detectors typically exhibit at the beginning of life and describes the normal changes in characteristics that are expected to occur as the detector ages in the in-core environment. Deviations from the normal aging effects that may be revealed through periodic testing are described. Possible root causes for some deviations from the expected performance are discussed. In addition to the power range monitoring detectors, the neutron monitoring system also utilizes other fission chambers for source range or intermediate range neutron monitoring during startup, and neutron or gamma detectors for periodic sensitivity re-calibration of the power range monitoring detectors. Each of the detectors has function specific requirements that call for additional diagnostic testing methods to evaluate performance. Diagnostic tests such as Time Domain Reflectometry and Current vs. Voltage (IV) characterization provide useful information about the condition of the detector and the signal path that links the detector to the reactor monitoring and control system. Typical test results of properly functioning detectors are described and the significance of deviations from a normal result is discussed. (authors)

Kniss, T.; Doyle, J. [GE Energy, 8499 Darrow Rd., Twinsburg, OH 44087 (United States)

2006-07-01

164

Adolescent insight within the working alliance: A bridge between diagnostic and psychotherapeutic processes  

PubMed Central

In the literature it has been stressed how important it is during consultation interviews to evaluate an adolescent’s insight with a view to starting psychotherapeutic work. Motivated adolescents bring to the therapeutic effort a real, interiorized request for help and can start moving towards a change. The aim of this study is to assess the insight of adolescents with mental disorders during the diagnostic process and to analyze how this relates to further therapeutic compliance and clinical evolution. The study included 55 adolescents, 35 males and 20 females aged between 11 and 19 years, who were advised to receive psychotherapeutic treatment after a diagnostic procedure. Patient insight was assessed at the beginning and end of the diagnostic process. Then, six months later, a clinical interview assessed their therapeutic compliance and clinical evolution. The findings suggest that insight is important when working with adolescents because it influences both therapeutic compliance and clinical outcome. PMID:24600260

Gatta, Michela; Spoto, Andrea; Testa, Paolo; Svanellini, Lorenza; Lai, Jessica; Salis, Maurizio; De Sauma, Maxim; Battistella, Pier Antonio

2010-01-01

165

Application Of The CSRL Language To The Design Of Diagnostic Expert Systems: The Moodis Experience, A Preliminary Report  

NASA Astrophysics Data System (ADS)

Computer technology is rapidly becoming an inseparable part of many health science specialties. Recently, a new area of computer technology, namely Artificial Intelligence, has been applied toward assisting the medical experts in their diagnostic and therapeutic decision making process. MOODIS is an experimental diagnostic expert system which assists Psychiatry specialists in diagnosing human Mood Disorders, better known as Affective Disorders. Its diagnostic methodology is patterned after MDX, a diagnostic expert system developed at LAIR (Laboratory for Artificial Intelligence Research) of Ohio State University. MOODIS is implemented in CSRL (Conceptual Structures Representation Language) also developed at LAIR. This paper describes MOODIS in terms of conceptualization and requirements, and discusses why the MDX approach and CSRL were chosen.

Bravos, Angelo; Hill, Howard; Choca, James; Bresolin, Linda B.; Bresolin, Michael J.

1986-03-01

166

UAS-Systems Integration, Validation, and Diagnostics Simulation Capability  

NASA Technical Reports Server (NTRS)

As part of the Phase 1 efforts of NASA's UAS-in-the-NAS Project a task was initiated to explore the merits of developing a system simulation capability for UAS to address airworthiness certification requirements. The core of the capability would be a software representation of an unmanned vehicle, including all of the relevant avionics and flight control system components. The specific system elements could be replaced with hardware representations to provide Hardware-in-the-Loop (HWITL) test and evaluation capability. The UAS Systems Integration and Validation Laboratory (UAS-SIVL) was created to provide a UAS-systems integration, validation, and diagnostics hardware-in-the-loop simulation capability. This paper discusses how SIVL provides a robust and flexible simulation framework that permits the study of failure modes, effects, propagation paths, criticality, and mitigation strategies to help develop safety, reliability, and design data that can assist with the development of certification standards, means of compliance, and design best practices for civil UAS.

Buttrill, Catherine W.; Verstynen, Harry A.

2014-01-01

167

Spontaneous Raman Scattering Diagnostics: Applications in Practical Combustion Systems. Chapter 5  

NASA Technical Reports Server (NTRS)

In this chapter, the recent advancements and practical aspects of laser SRS diagnostics have been reviewed wi til regards to applications in practical combustion systems. Clearly, SRS represents a theoretically and experimentally mature diagnostic technology that has become an essential tool for multiscalar measurements in turbulent combustion at elevated pressures. Today, time-, space-, spectrally, and even polarization-resolved S RS diagnostics is at hand, with aid from recent innovations in theoretical and technological developments on electro-optical or electromechanical devices. Whilst a linear increase in SRS signals can be expected in high-pressure systems (this is perhaps one of the most important advantages for using SRS in high-pressure systems), there are practical (often severe) restrictions associated with pressurized vessels, due mainly to the limited degree of optical access. This narrows ti,e available choice of diagnostics that can be employed at any given time. Point-wise SRS diagnostics provides the highest accuracy on the chemical species and temperature measurements, and will continue to remain a vital approach for the study in such harsh environments. The practical design considerations and hands-on set-up guide for SRS diagnostics provided in this chapter are rarely presented elsewhere. Although the second-harmonic Nd:YAG pulsed laser (532 nm), combined with pulse-stretching optics or the recently introduced White Cell-based laser, seems to be the most favored excitation source of choice by the research community, UV excitation will undoubtedly continue to be used on many occasions, and especially in sooting flames. Detection methods may be divided into ICCD-based nanosecond-gate detection or a rotary-chopper electromechanical shutter-based CCD array detection, and the levels of background flame emission in individual cases would determine this critical design choice. Here, a process of Raman signal calibration based on ti,e crosstalk matrix formalism was explained step-by-step. As tI,is process may be very time-consuming and expensive, a well-planned experimental approach (01' building a transferable calibration database or library (at least with in a user's own facility over a series of different testing and runs) is vitally important. Hands on advice on the design and construction of flow control systems for high pressure burner facilities were also presented.

Kojima, Jun; Viet-Nguyen, Quang; Lackner, Maximilian (Editor); Winter, Franz (Editor); Agarwal, Avinash (Editor)

2010-01-01

168

Process control of a plasma treatment of wool by plasma diagnostics  

Microsoft Academic Search

Wool was treated in a large-volume microwave plasma source SLAN II [D. Korzec, F. Werner, R. Winter, J. Engemann, Scaling of microwave slot antenna (SLAN): a concept for efficient plasma generation. Plasma Sources Sci. Technol. 5 (1996) 216–234] to improve the felting tendency. To control this plasma process, the applicability of three plasma diagnostic methods, optical emission spectroscopy (OES), double

F. Osenberg; D. Theirich; A. Decker; J. Engemann

1999-01-01

169

Numerical magnetic field analysis and signal processing for fault diagnostics of electrical machines  

Microsoft Academic Search

Numerical magnetic field analysis is used for predicting the performance of an induction motor and a slip-ring generator having different faults implemented in their structure. Virtual measurement data provided by the numerical magnetic field analysis are analysed using modern signal processing techniques to get a reliable indication of the fault. Support vector machine based classification is applied to fault diagnostics.

S. Pöyhönen; M. Negrea; P. Jover; A. Arkkio; H. Hyötyniemi

2003-01-01

170

Diagnostic Setup for Characterization of Near-Anode Processes in Hall Thrusters  

SciTech Connect

A diagnostic setup for characterization of the near-anode processes in Hall thrusters was designed and assembled. Experimental results with a single floating probe show that radial probe insertion does not cause perturbations to the discharge and therefore can be used for near-anode measurements.

L. Dorf; Y. Raitses; N. J. Fisch

2003-05-29

171

An automated computerized auscultation and diagnostic system for pulmonary diseases.  

PubMed

Respiratory sounds are of significance as they provide valuable information on the health of the respiratory system. Sounds emanating from the respiratory system are uneven, and vary significantly from one individual to another and for the same individual over time. In and of themselves they are not a direct proof of an ailment, but rather an inference that one exists. Auscultation diagnosis is an art/skill that is acquired and honed by practice; hence it is common to seek confirmation using invasive and potentially harmful imaging diagnosis techniques like X-rays. This research focuses on developing an automated auscultation diagnostic system that overcomes the limitations inherent in traditional auscultation techniques. The system uses a front end sound signal filtering module that uses adaptive Neural Networks (NN) noise cancellation to eliminate spurious sound signals like those from the heart, intestine, and ambient noise. To date, the core diagnosis module is capable of identifying lung sounds from non-lung sounds, normal lung sounds from abnormal ones, and identifying wheezes from crackles as indicators of different ailments. PMID:20703592

Abbas, Ali; Fahim, Atef

2010-12-01

172

Miniature magnetic resonance system for point-of-care diagnostics  

PubMed Central

We have developed a next generation, miniaturized platform to diagnose disease at the point-of-care using diagnostic magnetic resonance (DMR-3). Utilizing a rapidly growing library of functionalized magnetic nanoparticles, DMR has previously been demonstrated as a versatile tool to quantitatively and rapidly detect disease biomarkers in unprocessed biological samples. A major hurdle for bringing DMR to the point-of-care has been its sensitivity to temperature variation. As an alternative to costly and bulky mechanisms to control temperature, we have implemented an automated feedback system to track and compensate for the temperature drift, which enables reliable and robust DMR measurements in realistic clinical environments (4–50 °C). Furthermore, the new system interfaces with a mobile device to facilitate system control and data sharing over wireless networks. With such features, the DMR-3 platform can function as a self-contained laboratory even in resource-limited, remote settings. The clinical potential of the new system is demonstrated by detecting trace amounts of proteins and as few as 10 bacteria (Staphylococcus aureus) in a short time frame (<30 min). PMID:21547317

Issadore, David; Min, Changwook; Liong, Monty; Chung, Jaehoon; Weissleder, Ralph; Lee, Hakho

2011-01-01

173

Polarization-based optical imaging and processing techniques with application to the cancer diagnostics  

NASA Astrophysics Data System (ADS)

In this investigation, a polarization-based imaging system is developed and described that measures the two-dimensional effective backscattering Mueller matrix of a sample in near real-time. As is well known, a Mueller matrix can provide considerable information on the makeup and optical characteristics of a sample and also directly describes how the sample transforms an incident light beam. The ability to measure the two-dimensional Mueller matrix of a biological sample, therefore, can provide considerable information on the sample composition as well as the potential to reveal significant structural information that normally would not be visible through standard imaging techniques. Additional information can also be obtained through the application of image-processing, decomposition, and reconstruction techniques that operate directly on the 2D Mueller matrix. Using the developed system, it is shown how the induction of internal strain within the sample coupled with image reconstruction and decomposition techniques can further improve image contrast and aid in the detection of boundaries between tissues of different biomechanical and structural properties. The studies presented were performed with both rat tissue and a melanoma-based tissue culture. The results demonstrate how these techniques could provide information that may be of diagnostic value in the physical detection of malignant lesion boundaries.

Liu, Gang L.; Li, Yanfang; Cameron, Brent D.

2002-06-01

174

System diagnostics using qualitative analysis and component functional classification  

DOEpatents

A method for detecting and identifying faulty component candidates during off-normal operations of nuclear power plants involves the qualitative analysis of macroscopic imbalances in the conservation equations of mass, energy and momentum in thermal-hydraulic control volumes associated with one or more plant components and the functional classification of components. The qualitative analysis of mass and energy is performed through the associated equations of state, while imbalances in momentum are obtained by tracking mass flow rates which are incorporated into a first knowledge base. The plant components are functionally classified, according to their type, as sources or sinks of mass, energy and momentum, depending upon which of the three balance equations is most strongly affected by a faulty component which is incorporated into a second knowledge base. Information describing the connections among the components of the system forms a third knowledge base. The method is particularly adapted for use in a diagnostic expert system to detect and identify faulty component candidates in the presence of component failures and is not limited to use in a nuclear power plant, but may be used with virtually any type of thermal-hydraulic operating system.

Reifman, Jaques (Lisle, IL); Wei, Thomas Y. C. (Downers Grove, IL)

1993-01-01

175

System diagnostics using qualitative analysis and component functional classification  

DOEpatents

A method for detecting and identifying faulty component candidates during off-normal operations of nuclear power plants involves the qualitative analysis of macroscopic imbalances in the conservation equations of mass, energy and momentum in thermal-hydraulic control volumes associated with one or more plant components and the functional classification of components. The qualitative analysis of mass and energy is performed through the associated equations of state, while imbalances in momentum are obtained by tracking mass flow rates which are incorporated into a first knowledge base. The plant components are functionally classified, according to their type, as sources or sinks of mass, energy and momentum, depending upon which of the three balance equations is most strongly affected by a faulty component which is incorporated into a second knowledge base. Information describing the connections among the components of the system forms a third knowledge base. The method is particularly adapted for use in a diagnostic expert system to detect and identify faulty component candidates in the presence of component failures and is not limited to use in a nuclear power plant, but may be used with virtually any type of thermal-hydraulic operating system. 5 figures.

Reifman, J.; Wei, T.Y.C.

1993-11-23

176

Miniature magnetic resonance system for robust and portable diagnostics  

NASA Astrophysics Data System (ADS)

We have recently developed a new diagnostic platform, microNMR(?NMR), specifically designed for clinical applications This new ?NMR system performs rapid, accurate, and robust measurements of cells, proteins and small molecules in point-of-care settings. The system utilizes magnetic nanoparticles (MNPs) to amplify the analytical signals in NMR detection. When molecularly-specific MNPs identify their targets, the particles induce large, amplified changes in the transverse relaxation of water protons by producing local magnetic fields. A major challenge in achieving reliable NMR detection is the fluctuation of NMR frequency (f0) with temperature, which originates from the the temperature-dependent drift of the magnetic field. To overcome the challenge, we have implemented a new, automated feedback controller that keeps track of f0 and reconfigures measurement settings. The mechanism enables robust ?NMR measurements in realistic clinical environments (4-50 ^oC). Moreover, the ?NMR interfaces with mobile devices for its operation, maximizing the portability of ?NMR. The clinical utility of the new ?NMR system is demonstrated by detecting and molecularly profiling cancer cells from patient samples.

Min, Changwook; Issadore, David; Chung, Jaehoon; Shao, Huilin; Liong, Monty; Weissleder, Ralph; Lee, Hakho

2012-02-01

177

STS-57 Spacehab-01 Tools and Diagnostics System (TDS) displayed at bench review  

NASA Technical Reports Server (NTRS)

Tools and Diagnostics System (TDS) experiment equipment is displayed on a table top during the STS-57 Spacehab-01 (Commercial Middeck Augmentation Module (CMAM)) bench review at Boeing's Flight Equipment Processing Facility (FEPF) located near JSC. TDS will be stored in Spacehab-01 aft locker AC10 and includes electronic circuit boards, a soldering iron assembly, goggles, a printed circuit board holder, a portable battery charger, and a portable electronic diagnostic equipment package. TDS' sponsor is the Flight Crew Support Division, Space and Life Sciences Directorate, JSC. It will evaluate microgravity effects on the physics and human factors of soldering, the operation of the battery charger, and the operation of the diagnositic equipment package. Photo taken by NASA JSC contract photographer Benny Benavides.

1993-01-01

178

Undulator systems and photon diagnostics for the European XFEL project  

SciTech Connect

For the European XFEL project very long undulator systems are required. Due to the nature of the SASE process there are stringent requirements and tolerances on these systems. An extensive R and D phase to solutions has been started. In this contribution an overview over this R and D work is given.

Pflueger, J., E-mail: joachim.pflueger@xfel.eu [European XFEL (Germany)

2010-12-15

179

/Processes, Systems & Performance Manager 5 / / -  

E-print Network

/Processes, Systems & Performance Manager://jobs.teva.co.il/pos5935?referrerId=439 Processes, Systems & Performance Manager-" HTTP://jobs.teva.co.il/pos5917?referrer; / / : - CRO. . . , , . : / ( ) / -3 -data management - / CRO

Pinsky, Ross

180

Improved television signal processing system  

NASA Technical Reports Server (NTRS)

Digital system processes spacecraft television pictures by converting images sensed on a photostorage vidicon to pulses which can be transmitted by telemetry. This system can be applied in the processing of medical X ray photographs and in electron microscopy.

Wong, R. Y.

1967-01-01

181

SEALED COMBUSTION SYSTEM WITH DIAGNOSTIC SELF-TUNING.  

SciTech Connect

This task grew out of a proposal to develop a ''concept'' oil-fired heating system that would incorporate advanced technologies available and suitable for a residential system. Discussions among the program and project personnel resulted in the identification of a sealed combustion system as of programmatic interest and the objective was to develop an approach to a sealed system with diagnostic self-tuning. The major conclusion with regard to the specific objective for this task is that a measurement of the static pressure in the input pipe can be used to provide a measure of the excess air for a limit control. Its implementation would require a suitable pressure sensor, and a circuit to combine its output signal, at the appropriate time in the operating cycle, to the burner control. The sensor and control combination will also have to be tested successfully under all conceivable contingencies that can cause the airflow to decrease. It could also be implemented, possibly even more reliably, if a mass flow sensor, such as is used in automobile engines and hence may be cheap, could be used. The pressure measurements reported here, both steady and transient, represent only the subset of a much larger set that gave a useful answer to meet the objective. These measurements suggest that they can provide useful insights into both the combustion and gas flow performance of the system. Of course, this could be extended to other types of heating systems, such as those with natural draft, those with different burners, burners with different atomization schemes (air atomization etc.), blue flame burners etc.

KRISHNA,C.R.

2004-09-30

182

Continuous Path Controller of Slave Manipulator in Remote Ultrasound Diagnostic System  

Microsoft Academic Search

A master-slave type remote ultrasound diagnostic system was developed. The controller has impedance control capability for the master and slave manipulators' positions. And it has a Continuous Path(CP) control capability for the slave manipula- tor's orientation. This paper presents the controller of the slave manipulator's orientation. The remote ul- trasound diagnostic system is one of remote medical systems through communication

Norihiro Koizumi; Shin'ichi Warisawa; Mamoru Mitsuishi; Hiroyuki Hashizume

2002-01-01

183

Expert System for Diagnostics and Status Monitoring of NPP Water Chemistry Condition  

SciTech Connect

Water chemistry condition (WCC) has been the subject of constant study and improvement up to the present day. It is connected with the presence of a direct relationship between the violation of water chemistry regulation on the one hand and components reliability of the circuit's equipment and cost-effectiveness of their operation on the other. It dictates the necessity to apply different optimization methods in the field of monitoring and use of information - analytical and diagnostic systems to assess WCC quality, control and support. By now NPP experts have broad experience in revealing and removing the causes of WCC disturbances. However this knowledge is often of an intuitive, non-classified nature, scattered among various working documents, which makes their transfer difficult. Based on what has been mentioned above, special attention is currently being paid to the problem of creating expert diagnostic systems for supporting the optimum WCC. The existing developments in this field (DIWA, Smart chem Works, the water quality control system at the Onagava NPP etc. [1,3,4,5] are based on wide use of experts' knowledge. Such expert diagnostic systems for supporting WCC refer to the new generation of intellectual control methods, which allow the incorporation of the latest achievements both in the field of water chemistry simulation and in the field of artificial intelligence and computer technologies. LI 'VNIPIET' employees have, for several years, been developing an expert diagnostic system for supporting WCC and status monitoring of RBMK - reactor NPPs [2]. This system has not only conveniently organized the traditional functions of information acquisition and storage, a complete presentation of information in the form of tables, graphs of a dynamical changes of parameters and formation regular reports, diagnostic functions and issuing recommendations on WCC correction, but it also allows the assessment of confidence in the diagnosis made, relying on a wide range of numerical estimates, which were calculated by the use of expert data, and to make a credible prediction of an existing situation development. The integrated use of analytical methods and artificial intelligence methods is one of the system's advantages. This combination allows the successful implementation of one of the main purposes of the system: the early detection of deviations from specified process conditions and the taking into account of even minor changes in parameters to provide an advanced WCC control and to prevent non-regular situations. (authors)

Shvedova, M.N.; Kritski, V.G.; Zakharova, S.V.; Nikolaev, F.V.; Benediktov, V.B. [All Russian Scientific Research and Design Institute of Complex Power Technology, 82 ulitsa Savushkina, St. Petersburg 197228 (Russian Federation)

2002-07-01

184

Robust diagnostic approach for uncertain systems: an example for the jet engine sensor systems  

NASA Astrophysics Data System (ADS)

This paper presents a novel eigenstructure assignment approach for sythesizing robust fault detection and isolation (FDI) systems with known inputs. After formulating the FDI problem in eigenstructure assigment, we proceed to develop a parametric characterization of all allowable eigenspaces for disturbance decoupling to achieve robust fault detection. In addition to the structured uncertainties, the robustness of the diagnostic observer to unstructured modeling errors is discussed. A numerical algorithm is further proposed to suppress the effects due to the unstructured uncertainties. The overall robustness of the diagnostic strategy is verfied through simulation studies on jet engine systems.

Hsu, Pau-Lo; Shen, Li-Cheng

1995-05-01

185

TROUBLE 3: A fault diagnostic expert system for Space Station Freedom's power system  

NASA Technical Reports Server (NTRS)

Designing Space Station Freedom has given NASA many opportunities to develop expert systems that automate onboard operations of space based systems. One such development, TROUBLE 3, an expert system that was designed to automate the fault diagnostics of Space Station Freedom's electric power system is described. TROUBLE 3's design is complicated by the fact that Space Station Freedom's power system is evolving and changing. TROUBLE 3 has to be made flexible enough to handle changes with minimal changes to the program. Three types of expert systems were studied: rule-based, set-covering, and model-based. A set-covering approach was selected for TROUBLE 3 because if offered the needed flexibility that was missing from the other approaches. With this flexibility, TROUBLE 3 is not limited to Space Station Freedom applications, it can easily be adapted to handle any diagnostic system.

Manner, David B.

1990-01-01

186

ITER diagnostic systems in development in Ioffe Institute  

NASA Astrophysics Data System (ADS)

Three diagnostic systems are being developed in Ioffe Institute for ITER. Those are Neutral Particle Analysis (NPA), Thomson Scattering in Divertor (TSD) and Gamma Spectroscopy (GS). The main objective of NPA in ITER is to measure D/T fuel ration in plasma on the basis of measurement of neutralized fluxes of D and T ions [1]. Fuel ratio is one of the key parameters needed by ITER control system to provide the optimal conditions in plasma and the most effective plasma burning. Another objective is to measure the distribution function of fast ions (including alpha particles) generated as a result of the additional heating and nuclear fusion reactions. Thomson Scattering in Divertor (TSD) [2] will be used to measure electron temperature and density in the scrape-off layer in outer leg of ITER divertor. The main task of TSD is to protect the machine from divertor overloading. Gamma Spectroscopy (GS) [3] is based on the measurement of spectral lines of MeV range gammas generated in nuclear reactions in plasma. 2-D gamma-ray emission measurements give valuable information on the confined alpha particles in DT plasma. They also provide important information on the location of MeV range runaway electron beams in ITER plasma. For all three cases the physical basis and instrumentation are presented. The simple NPA version for measurements of D/T ratio in DEMO is also briefly described.

Petrov, M.; Afanasyev, V.; Petrov, S.; Mironov, M.; Mukhin, E.; Tolstyakov, S.; Chugunov, I.; Shevelev, A.

2014-08-01

187

Modification of an automated vascular diagnostic system for hyperbaric use.  

PubMed

Modifications of an automated, noninvasive vascular diagnostic system (VASCULAB, MedaSonics, Inc.) for measuring blood pressure and plethysmographic blood flow responses to normobaric and hyperbaric oxygenation are described. The system consisted of a pump for inflating and deflating blood pressure cuffs and a microprocessor program controller (VSC21) with ultrasound Doppler, strain-gauge plethysmograph, and chart recorder. Inclusion of the VSC21 controller in the chamber was required for performance of procedures that could not be controlled from outside the chamber. All other components were outside the chamber. For fire prevention the VSC21 controller was nitrogen-purged in an acrylic case mounted on a mobile cart. Pressure-cuff tubes were attached via adapted fittings and connectors in the cart to connector ports in the controller's front panel. Electrical power cables and instrument signal wires were routed through chamber penetrations to an electrical power source and other VASCULAB components, respectively, outside the chamber. Initially, compression of the chamber to pressures in excess of 1.68 bar disabled the VSC21, requiring removal of its front membrane panel and ventilation of its pressure-sensitive keypad switches. This allowed automated assessment of blood pressure and calf blood flow at test pressures of 1.97 and 2.96 bar. PMID:2356594

Dooley, J W; Mehm, W J; Jennings, C A; Flowers, E P; Casale, J G

1990-05-01

188

Design of a study on suboptimal cognitive acts in the diagnostic process, the effect on patient outcomes and the influence of workload, fatigue and experience of physician  

Microsoft Academic Search

BACKGROUND: Diagnostic error is an important error type since diagnostic adverse events are regularly judged as being preventable and the consequences are considered to be severe. Existing research often focuses on either diagnostic adverse events or on the errors in diagnostic reasoning. Whether and when an incorrect diagnostic process results in adverse outcomes has not been studied extensively. The present

Laura Zwaan; Abel Thijs; Cordula Wagner; Gerrit van der Wal; Daniëlle RM Timmermans

2009-01-01

189

Process to generate a synthetic diagnostic for microwave imaging reflectometry with the full-wave code FWR2Da)  

NASA Astrophysics Data System (ADS)

A synthetic microwave imaging reflectometer (MIR) diagnostic employing the full-wave reflectometer code (FWR2D) has been developed and is currently being used to guide the design of real systems, such as the one recently installed on DIII-D. The FWR2D code utilizes real plasma profiles as input, and it is combined with optical simulation tools for synthetic diagnostic signal generation. A detailed discussion of FWR2D and the process to generate the synthetic signal are presented in this paper. The synthetic signal is also compared to a prescribed density fluctuation spectrum to quantify the imaging quality. An example is presented with H-mode-like plasma profiles derived from a DIII-D discharge, where the MIR focal is located in the pedestal region. It is shown that MIR is suitable for diagnosing fluctuations with poloidal wavenumber up to 2.0 cm-1 and fluctuation amplitudes less than 5%.

Ren, X.; Domier, C. W.; Kramer, G.; Luhmann, N. C.; Muscatello, C. M.; Shi, L.; Tobias, B. J.; Valeo, E.

2014-11-01

190

The SSCL process control system  

NASA Astrophysics Data System (ADS)

The Superconducting Super Collider's (SSC) Process Control System was designed to account for 40% of the total I/O control points of the accelerator. It would have controlled the processes associated with the cryogenic refrigerators, vacuum systems, low conductivity water systems and instrument air system of the SSC. Although large scale, the technologies required to control and program such systems in an integrated manner is becoming available through industrial distributed systems controls vendors. This paper describes the proposed architecture of the SSCL Process Control System, how it is differentiated from the SSC Beam Controls and the techniques that would have been employed to integrate it into the SSCL Global Accelerator Control System.

Moore, T.; Bork, R.; Heefner, J.; Basiti, S.

1994-12-01

191

A contactless microwave-based diagnostic tool for high repetition rate laser systems.  

PubMed

We report on a novel electro-optic device for the diagnostics of high repetition rate laser systems. It is composed of a microwave receiver and of a second order nonlinear crystal, whose irradiation with a train of short laser pulses produces a time-dependent polarization in the crystal itself as a consequence of optical rectification. This process gives rise to the emission of microwave radiation that is detected by a receiver and is analyzed to infer the repetition rate and intensity of the pulses. We believe that this new method may overcome some of the limitations of photodetection techniques. PMID:24593347

Braggio, C; Borghesani, A F

2014-02-01

192

SSME HPOTP post-test diagnostic system enhancement project  

NASA Technical Reports Server (NTRS)

An assessment of engine and component health is routinely made after each test or flight firing of a space shuttle main engine (SSME). Currently, this health assessment is done by teams of engineers who manually review sensor data, performance data, and engine and component operating histories. Based on review of information from these various sources, an evaluation is made as to the health of each component of the SSME and the preparedness of the engine for another test or flight. The objective of this project is to further develop a computer program which automates the analysis of test data from the SSME high-pressure oxidizer turbopump (HPOTP) in order to detect and diagnose anomalies. This program fits into a larger system, the SSME Post-Test Diagnostic System (PTDS), which will eventually be extended to assess the health and status of most SSME components on the basis of test data analysis. The HPOTP module is an expert system, which uses 'rules-of-thumb' obtained from interviews with experts from NASA Marshall Space Flight Center (MSFC) to detect and diagnose anomalies. Analyses of the raw test data are first performed using pattern recognition techniques which result in features such as spikes, shifts, peaks, and drifts being detected and written to a database. The HPOTP module then looks for combination of these features which are indicative of known anomalies, using the rules gathered from the turbomachinery experts. Results of this analysis are then displayed via a graphical user interface which provides ranked lists of anomalies and observations by engine component, along with supporting data plots for each.

Bickmore, Timothy W.

1995-01-01

193

Diagnostic omission errors in acute paediatric practice: impact of a reminder system on decision-making  

PubMed Central

Background Diagnostic error is a significant problem in specialities characterised by diagnostic uncertainty such as primary care, emergency medicine and paediatrics. Despite wide-spread availability, computerised aids have not been shown to significantly improve diagnostic decision-making in a real world environment, mainly due to the need for prolonged system consultation. In this study performed in the clinical environment, we used a Web-based diagnostic reminder system that provided rapid advice with free text data entry to examine its impact on clinicians' decisions in an acute paediatric setting during assessments characterised by diagnostic uncertainty. Methods Junior doctors working over a 5-month period at four paediatric ambulatory units consulted the Web-based diagnostic aid when they felt the need for diagnostic assistance. Subjects recorded their clinical decisions for patients (differential diagnosis, test-ordering and treatment) before and after system consultation. An expert panel of four paediatric consultants independently suggested clinically significant decisions indicating an appropriate and 'safe' assessment. The primary outcome measure was change in the proportion of 'unsafe' workups by subjects during patient assessment. A more sensitive evaluation of impact was performed using specific validated quality scores. Adverse effects of consultation on decision-making, as well as the additional time spent on system use were examined. Results Subjects attempted to access the diagnostic aid on 595 occasions during the study period (8.6% of all medical assessments); subjects examined diagnostic advice only in 177 episodes (30%). Senior House Officers at hospitals with greater number of available computer workstations in the clinical area were most likely to consult the system, especially out of working hours. Diagnostic workups construed as 'unsafe' occurred in 47/104 cases (45.2%); this reduced to 32.7% following system consultation (McNemar test, p < 0.001). Subjects' mean 'unsafe' workups per case decreased from 0.49 to 0.32 (p < 0.001). System advice prompted the clinician to consider the 'correct' diagnosis (established at discharge) during initial assessment in 3/104 patients. Median usage time was 1 min 38 sec (IQR 50 sec – 3 min 21 sec). Despite a modest increase in the number of diagnostic possibilities entertained by the clinician, no adverse effects were demonstrable on patient management following system use. Numerous technical barriers prevented subjects from accessing the diagnostic aid in the majority of eligible patients in whom they sought diagnostic assistance. Conclusion We have shown that junior doctors used a Web-based diagnostic reminder system during acute paediatric assessments to significantly improve the quality of their diagnostic workup and reduce diagnostic omission errors. These benefits were achieved without any adverse effects on patient management following a quick consultation. PMID:17087835

Ramnarayan, Padmanabhan; Winrow, Andrew; Coren, Michael; Nanduri, Vasanta; Buchdahl, Roger; Jacobs, Benjamin; Fisher, Helen; Taylor, Paul M; Wyatt, Jeremy C; Britto, Joseph

2006-01-01

194

Parallel Processing System  

NASA Technical Reports Server (NTRS)

In order to process very high resolution image data from spacecraft sensors, Goddard Space Flight Center commissioned the development of a Massively Parallel Processor (MPP) based upon simultaneous processing of image picture elements (pixels) rather than serial processing. It resulted in a considerable increase in computational speed. MasPar Computer Corporation's MasPar MP-1 incorporates this technology, allowing users to attack a variety of computationally-intensive problems. The MP-1 is no longer manufactured but has been replaced by the MP-2, a more advanced model.

1991-01-01

195

Imaging system for hypervelocity dust injection diagnostic on NSTX  

SciTech Connect

The novel hypervelocity dust injection diagnostic will facilitate our understanding of basic aspects of dust-plasma interaction and magnetic field topology in fusion plasma devices, by observing 'comet tails' associated with the injected micron-size dust particles. A single projection of the tail onto an image plane will not provide sufficient information; therefore, we plan to use two views, with intensified DiCam-Pro cameras on two NSTX ports. Each camera can furnish up to five overlaying sequential images with gate times greater than 3 ns and 1280x1024 pixel resolution. A coherent fiber bundle with 1500x1200 fibers will relay the image from an imaging lens installed directly on the port to the camera optics. The lens receives light from the outer portion of the NSTX cross section and focuses a 1 cm tail onto at least 60 fibers for adequate resolution. The estimated number of photons received by the camera indicates signal-to-noise ratios of 10{sup 2}-10{sup 4}, with the use of a 10 nm bandwidth filter. The imaging system with one camera was successfully tested on NSTX in 2005. Photographing lithium pellets yielded bright and distinctive pictures of the tails nearly aligned with B lines. We also observed that the bright 'filaments' - plasma cords with high density and temperature - are present in both top and bottom portions of the machine.

Dorf, L. A.; Roquemore, A. L.; Wurden, G. A.; Ticos, C. M.; Wang Zhehui [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2006-10-15

196

Vacuum System Design and Tritium Inventory for the TFTR Charge Exchange Diagnostic.  

National Technical Information Service (NTIS)

The charge exchange diagnostic for the TFTR is comprised of two analyzer systems which contain a total of twenty independent mass/energy analyzers and one diagnostic neutral beam tentatively rated at 80 keV, 15 A. The associated vacuum systems were analyz...

S. S. Medley

1979-01-01

197

Evolving a Diagnostic Assessment System for Formative Use by Senior School System Executives in the USA.  

ERIC Educational Resources Information Center

Describes the Diagnostic Executive Competency Analysis System (DECAS) developed by researchers at the University of Texas (Austin). Applies assessment center methods conventionally used for selection and screening purposes to formative needs-based professional development activities. Presents DECAS within the framework of the U.S. Multi-Site…

Carter, D. S. G.; And Others

1991-01-01

198

A General Expert System Design for Diagnostic Problem Solving  

Microsoft Academic Search

Existing expert systems have a high percentage agreement with experts in a particular field in many situations. However, in many ways their overall behavior is not like that of a human expert. These areas include the inability to give flexible, functional explanations of their reasoning processes, and the failure to degrade gracefully when dealing with problems at the periphery of

Pamela K. Fink; John C. Lusth; Joe W. Duran

1985-01-01

199

A malaria diagnostic system based on electric impedance spectroscopy  

E-print Network

Malaria caused by Plasmodium falciparum infection is one of the major threats to world health and especially to the community without proper medical care. New approach to cost-efficient, portable, miniaturized diagnostic ...

Ha, Sungjae

2011-01-01

200

System Diagnostic Builder - A rule generation tool for expert systems that do intelligent data evaluation. [applied to Shuttle Mission Simulator  

NASA Technical Reports Server (NTRS)

Consideration is given to the System Diagnostic Builder (SDB), an automated knowledge acquisition tool using state-of-the-art AI technologies. The SDB employs an inductive machine learning technique to generate rules from data sets that are classified by a subject matter expert. Thus, data are captured from the subject system, classified, and used to drive the rule generation process. These rule bases are used to represent the observable behavior of the subject system, and to represent knowledge about this system. The knowledge bases captured from the Shuttle Mission Simulator can be used as black box simulations by the Intelligent Computer Aided Training devices. The SDB can also be used to construct knowledge bases for the process control industry, such as chemical production or oil and gas production.

Nieten, Joseph; Burke, Roger

1993-01-01

201

Imaging Systems for Medical Diagnosis: Fundamentals and Technical Solutions - X-Ray Diagnostics- Computed Tomography - Nuclear Medical Diagnostics - Magnetic Resonance Imaging - Ultrasound Technology  

NASA Astrophysics Data System (ADS)

Erick Krestel, Editor Imaging Systems for Medical Diagnostics This book provides physicians and clinical physicists with detailed information on todya's imaging modalities and assists them in selecting the optimal system for each clinical application. Physicists, engineers and computer specialists engaged in research and development and sales departments will also find this book to be of considerable use. It may also be employed at universities, training centers and in technical seminars. The physiological and physical fundamentals are explained in part 1. The technical solutions contained in part 2 illustrate the numerous possibilities available in x-ray diagnostics, computed tomography, nuclear medical diagnostics, magnetic resonance imaging, sonography and biomagnetic diagnostics. Overview of Contents Physiology of vision Image quality X-ray and gamma radiation X-ray diagnostics Computed tomography Nuclear medical diagnostics Magnetic resonance imaging Sonography Biomagnetic diagnostics

Krestel, Erich

1990-10-01

202

On-board fault diagnostics for fly-by-light flight control systems using neural network flight processors  

NASA Astrophysics Data System (ADS)

Fly-by-Light control systems offer higher performance for fighter and transport aircraft, with efficient fiber optic data transmission, electric control surface actuation, and multi-channel high capacity centralized processing combining to provide maximum aircraft flight control system handling qualities and safety. The key to efficient support for these vehicles is timely and accurate fault diagnostics of all control system components. These diagnostic tests are best conducted during flight when all facts relating to the failure are present. The resulting data can be used by the ground crew for efficient repair and turnaround of the aircraft, saving time and money in support costs. These difficult to diagnose (Cannot Duplicate) fault indications average 40 - 50% of maintenance activities on today's fighter and transport aircraft, adding significantly to fleet support cost. Fiber optic data transmission can support a wealth of data for fault monitoring; the most efficient method of fault diagnostics is accurate modeling of the component response under normal and failed conditions for use in comparison with the actual component flight data. Neural Network hardware processors offer an efficient and cost-effective method to install fault diagnostics in flight systems, permitting on-board diagnostic modeling of very complex subsystems. Task 2C of the ARPA FLASH program is a design demonstration of this diagnostics approach, using the very high speed computation of the Adaptive Solutions Neural Network processor to monitor an advanced Electrohydrostatic control surface actuator linked through a AS-1773A fiber optic bus. This paper describes the design approach and projected performance of this on-line diagnostics system.

Urnes, James M., Sr.; Cushing, John; Bond, William E.; Nunes, Steve

1996-10-01

203

Score, Pseudo-Score and Residual Diagnostics for Spatial Point Process Models  

Microsoft Academic Search

We develop new tools for formal inference and informal model validation in the analysis of spatial point pattern data. The score test is generalized to a “pseudo-score” test derived from Besag’s pseudo-likelihood, and to a class of diagnostics based on point process residuals. The results lend theoretical support to the established practice of using functional summary statistics, such as Ripley’s

Adrian Baddeley; Ege Rubak; Jesper Møller

2011-01-01

204

Wireless optical diagnostic apparatus for analyzing diamond thin film CVD process under high gravity conditions  

Microsoft Academic Search

A wireless optical emission diagnostic apparatus has been developed for in-situ diagnosis of the high gravity (HG) plasma properties during diamond chemical vapor deposition using H2–CH4 gas mixture. Optical emission spectroscopy (OES) enabled us to identify the emitting chemical species and to qualitatively investigate the plasma composition changes as a function of process parameters, including gravity, up to 100 g.

F. Tappero; Y. Abe; Y. Takagi; Y. Tanaka; G. Maizza

2004-01-01

205

Autonomous power expert fault diagnostic system for Space Station Freedom electrical power system testbed  

NASA Technical Reports Server (NTRS)

The goal of the Autonomous Power System (APS) program is to develop and apply intelligent problem solving and control to the Space Station Freedom Electrical Power System (SSF/EPS) testbed being developed and demonstrated at NASA Lewis Research Center. The objectives of the program are to establish artificial intelligence technology paths, to craft knowledge-based tools with advanced human-operator interfaces for power systems, and to interface and integrate knowledge-based systems with conventional controllers. The Autonomous Power EXpert (APEX) portion of the APS program will integrate a knowledge-based fault diagnostic system and a power resource planner-scheduler. Then APEX will interface on-line with the SSF/EPS testbed and its Power Management Controller (PMC). The key tasks include establishing knowledge bases for system diagnostics, fault detection and isolation analysis, on-line information accessing through PMC, enhanced data management, and multiple-level, object-oriented operator displays. The first prototype of the diagnostic expert system for fault detection and isolation has been developed. The knowledge bases and the rule-based model that were developed for the Power Distribution Control Unit subsystem of the SSF/EPS testbed are described. A corresponding troubleshooting technique is also described.

Truong, Long V.; Walters, Jerry L.; Roth, Mary Ellen; Quinn, Todd M.; Krawczonek, Walter M.

1990-01-01

206

Theoretical studies of nonadiabatic and spin-forbidden processes: Investigations of the reactions and spectroscopy of radical species relevant to combustion reactions and diagnostics  

SciTech Connect

This research program focusses on studies of spin-forbidden and electronically nonadiabatic processes involving radical species relevant to combustion reactions and combustion diagnostics. To study the electronic structure aspects of these processes a unique and powerful system of electronic structure programs, developed over the past nine years, the BROOKLYN codes, is employed. These programs enable the authors to address questions basic to the understanding of elementary combustion processes not tractable using more standard quantum chemistry codes.

Yarkony, D.R. [Johns Hopkins Univ., Baltimore, MD (United States)

1993-12-01

207

Real-time Optical Alignment and Diagnostic System (ROADS)  

NASA Technical Reports Server (NTRS)

The ultimate and most frequent usage of ROADS will be the alignment of subassemblies (collector and collimator) prior to their installation in a chamber. The system as designed has inherent associated capabilities well applied to acceptance testing of the No. 4 mirror, prediction of in-chamber performance, generation of a catalog of test results and other data, providing data for the plotting of isointensity lines, and other applications which are discussed. The ROADS system will collect, process, display, analyze, and retain data as required for components, partial subassemblies, complete subassemblies, complete modules, and multimodular arrays.

1972-01-01

208

Automated high-throughput flow-through real-time diagnostic system  

DOEpatents

An automated real-time flow-through system capable of processing multiple samples in an asynchronous, simultaneous, and parallel fashion for nucleic acid extraction and purification, followed by assay assembly, genetic amplification, multiplex detection, analysis, and decontamination. The system is able to hold and access an unlimited number of fluorescent reagents that may be used to screen samples for the presence of specific sequences. The apparatus works by associating extracted and purified sample with a series of reagent plugs that have been formed in a flow channel and delivered to a flow-through real-time amplification detector that has a multiplicity of optical windows, to which the sample-reagent plugs are placed in an operative position. The diagnostic apparatus includes sample multi-position valves, a master sample multi-position valve, a master reagent multi-position valve, reagent multi-position valves, and an optical amplification/detection system.

Regan, John Frederick

2012-10-30

209

The Astronomical Image Processing System  

E-print Network

The Astronomical Image Processing System Eric W. Greisen September 12, 1988 National Radio!egreisen Introduction The Astronomical Image Processing System, AIPS for short, is the National Radio and what they will find unnatural. And I cannot conceive some of the algorithms which will be invented

Groppi, Christopher

210

Heterogeneous media events processing systems  

Microsoft Academic Search

A key challenge to the successful application of the data modeling, storage and retrieval is the processing of relevant media to determine the events that are represented by them. Towards this goal, we are developing a heterogeneous media events processing system that combines human expertise with algorithmic processing capabilities. In doing so, we seek to leverage the fact that computers

Pilho Kim; Ramesh Jain

2004-01-01

211

Diagnostic Evaluation of Ozone Production and Horizontal Transport in a Regional Photochemical Air Quality Modeling System  

EPA Science Inventory

A diagnostic model evaluation effort has been performed to focus on photochemical ozone formation and the horizontal transport process since they strongly impact the temporal evolution and spatial distribution of ozone (O3) within the lower troposphere. Results from th...

212

Information processing in biological systems  

SciTech Connect

This volume presents frontier research in information processing related to a variety of biological systems, including small assemblies of neurons in the cortex and large-scale metabolic systems; the statistics, dynamics, and phase transitions of stochastic information processing; and the microscopic-macroscopic interface in biological information processing. Physical principles and proteinoid experiments are discussed regarding the emergence of life and information and cause. The final paper offers a design for a one-dimensional brain.

Mintz, S.L.; Perlmutter, A.

1985-01-01

213

Psychoacoustic Assessment of Speech Communication Systems. The Diagnostic Discrimination Test.  

ERIC Educational Resources Information Center

The present report traces the rationale, development and experimental evaluation of the Diagnostic Discrimination Test (DDT). The DDT is a three-choice test of consonant discriminability of the perceptual/acoustic dimensions of consonant phonemes within specific vowel contexts. The DDT was created and developed in an attempt to provide a…

Grether, Craig Blaine

214

Medical diagnostic decision support systems--past, present, and future: a threaded bibliography and brief commentary.  

PubMed Central

Articles about medical diagnostic decision support (MDDS) systems often begin with a disclaimer such as, "despite many years of research and millions of dollars of expenditures on medical diagnostic systems, none is in widespread use at the present time." While this statement remains true in the sense that no single diagnostic system is in widespread use, it is misleading with regard to the state of the art of these systems. Diagnostic systems, many simple and some complex, are now ubiquitous, and research on MDDS systems is growing. The nature of MDDS systems has diversified over time. The prospects for adoption of large-scale diagnostic systems are better now than ever before, due to enthusiasm for implementation of the electronic medical record in academic, commercial, and primary care settings. Diagnostic decision support systems have become an established component of medical technology. This paper provides a review and a threaded bibliography for some of the important work on MDDS systems over the years from 1954 to 1993. PMID:7719792

Miller, R A

1994-01-01

215

Strategies for adding adaptive learning mechanisms to rule-based diagnostic expert systems  

NASA Technical Reports Server (NTRS)

Rule-based diagnostic expert systems can be used to perform many of the diagnostic chores necessary in today's complex space systems. These expert systems typically take a set of symptoms as input and produce diagnostic advice as output. The primary objective of such expert systems is to provide accurate and comprehensive advice which can be used to help return the space system in question to nominal operation. The development and maintenance of diagnostic expert systems is time and labor intensive since the services of both knowledge engineer(s) and domain expert(s) are required. The use of adaptive learning mechanisms to increment evaluate and refine rules promises to reduce both time and labor costs associated with such systems. This paper describes the basic adaptive learning mechanisms of strengthening, weakening, generalization, discrimination, and discovery. Next basic strategies are discussed for adding these learning mechanisms to rule-based diagnostic expert systems. These strategies support the incremental evaluation and refinement of rules in the knowledge base by comparing the set of advice given by the expert system (A) with the correct diagnosis (C). Techniques are described for selecting those rules in the in the knowledge base which should participate in adaptive learning. The strategies presented may be used with a wide variety of learning algorithms. Further, these strategies are applicable to a large number of rule-based diagnostic expert systems. They may be used to provide either immediate or deferred updating of the knowledge base.

Stclair, D. C.; Sabharwal, C. L.; Bond, W. E.; Hacke, Keith

1988-01-01

216

Real-time optical diagnostics for the basic oxygen steelmaking process  

SciTech Connect

This article deals with the development of real-time optical diagnostic techniques for process control in basic oxygen steelmaking. Results are presented of pilot-scale feasibility experiments conducted in the two-ton basic oxygen furnace (BOF) at Bethlehem Steel Corporation`s Homer Research Laboratories. Two line-of-sight optical techniques are being evaluated for determining the concentration and temperature of infrared-active gases in the BOF off-gas. The primary objective is to relate the concentration of these gas-phase species to the carbon content of the molten metal, and thereby provide a real-time indication of the process endpoint. Three cw lasers were used to measure the extent of beam attenuation at three different wavelengths in the particle-laden off-gas. The primary attenuation mechanism appears to be scattering by a dense, sub-micron diameter FeO fume. Initial infrared emission experiments with a Fourier transform infrared spectrometer at 1-cm{sup {minus}1} spectral resolution show partially resolved lines in the P-branch of the fundamental CO ground state and first hot-band transitions; CO{sub 2} bandheads are also clearly observed at 2384 and 2397 cm{sup {minus}1}. A second set of experiments was conducted to test the feasibility of oxygen-lance based fiber-optic imaging/pyrometric sensors for measurements of melt temperature and reaction zone properties. During bottom injection of nitrogen, clearly defined images of the melt/slag surface were obtained using both visible and near-infrared video systems. During oxygen blowing, optical emission from the hot spot was observed to fluctuate widely, with characteristic frequencies in the range of 3--10 Hz. Near the end of the process, the emission is characterized by periodic intensity bursts, interpreted as individual ignition events of duration 10--50 msec. Hot spot temperatures were calculated from the emission at 800 and 950 nm wavelengths using a grey-body assumption.

Ottesen, D.K.; Hurt, R.H.; Hardesty, D.R.

1993-02-01

217

Real-time optical diagnostics for the basic oxygen steelmaking process  

SciTech Connect

This article deals with the development of real-time optical diagnostic techniques for process control in basic oxygen steelmaking. Results are presented of pilot-scale feasibility experiments conducted in the two-ton basic oxygen furnace (BOF) at Bethlehem Steel Corporation's Homer Research Laboratories. Two line-of-sight optical techniques are being evaluated for determining the concentration and temperature of infrared-active gases in the BOF off-gas. The primary objective is to relate the concentration of these gas-phase species to the carbon content of the molten metal, and thereby provide a real-time indication of the process endpoint. Three cw lasers were used to measure the extent of beam attenuation at three different wavelengths in the particle-laden off-gas. The primary attenuation mechanism appears to be scattering by a dense, sub-micron diameter FeO fume. Initial infrared emission experiments with a Fourier transform infrared spectrometer at 1-cm[sup [minus]1] spectral resolution show partially resolved lines in the P-branch of the fundamental CO ground state and first hot-band transitions; CO[sub 2] bandheads are also clearly observed at 2384 and 2397 cm[sup [minus]1]. A second set of experiments was conducted to test the feasibility of oxygen-lance based fiber-optic imaging/pyrometric sensors for measurements of melt temperature and reaction zone properties. During bottom injection of nitrogen, clearly defined images of the melt/slag surface were obtained using both visible and near-infrared video systems. During oxygen blowing, optical emission from the hot spot was observed to fluctuate widely, with characteristic frequencies in the range of 3--10 Hz. Near the end of the process, the emission is characterized by periodic intensity bursts, interpreted as individual ignition events of duration 10--50 msec. Hot spot temperatures were calculated from the emission at 800 and 950 nm wavelengths using a grey-body assumption.

Ottesen, D.K.; Hurt, R.H.; Hardesty, D.R.

1993-02-01

218

SID: An automated diagnostic inserter system for inertial confinement fusion experiments (abstract)  

NASA Astrophysics Data System (ADS)

In order to provide an accurate, repeatable reentrant plasma diagnostic support, an in-vacuum automated robotic diagnostic inserter (SID) was designed, built, and tested for the Phebus French laser facility. The SID system allows us to change quickly and accurately a diagnostic required for a new experiment. The other advantage of this new system is that the detector can be placed closer to the plasma (<0.5 m) and consequently the sensitivity of the corresponding diagnostic to x-ray photons or neutrons is increased. That permits more accurate measurements in present inertial confinement fusion (ICF) experiments (larger magnification ratio imaging systems with better spectral resolution). The SID has three major components: (i) a mobile platform which carries the diagnostic itself, (ii) a vacuum chamber, and (iii) an accurate mechanical guide system inside the target chamber. The repeatability of the diagnostic repositioning is at least ±10 ?m over a travel range of 220 mm. Two main diagnostics are today in operation: a time grated x-ray imaging system and a high resolution crystal spectrograph. A detailed description of the main features of our SID and of two experimental results (implosion core formation imaging and spectra of x-ray argon filled microballoon) will be presented.

Bourgade, J. L.; Reverdin, C.; Bailleux, D.; Chaigneau, F.; Charet, M.; Desenne, D.; Le Breton, J. P.; Renaudin, P.; Mens, A.; Schirmann, D.

1997-01-01

219

Computer Aided Diagnostic Support System for Skin Cancer: A Review of Techniques and Algorithms  

PubMed Central

Image-based computer aided diagnosis systems have significant potential for screening and early detection of malignant melanoma. We review the state of the art in these systems and examine current practices, problems, and prospects of image acquisition, pre-processing, segmentation, feature extraction and selection, and classification of dermoscopic images. This paper reports statistics and results from the most important implementations reported to date. We compared the performance of several classifiers specifically developed for skin lesion diagnosis and discussed the corresponding findings. Whenever available, indication of various conditions that affect the technique's performance is reported. We suggest a framework for comparative assessment of skin cancer diagnostic models and review the results based on these models. The deficiencies in some of the existing studies are highlighted and suggestions for future research are provided. PMID:24575126

Masood, Ammara; Al-Jumaily, Adel Ali

2013-01-01

220

Persistence, Diagnostic Specificity and Genetic Liability For Context-processing Deficits In Schizophrenia  

PubMed Central

Context-processing deficits have been shown in schizophrenia during first-episode, medication-naïve status, that persist after short-term antipsychotic treatment and also in first-degree relatives of individuals with schizophrenia. To confirm longer term persistence of deficits, we examined schizophrenia patients (n=63) during first-episode, medication-naïve status through to one-year follow-up, compared to healthy control (n=83) and non-schizophrenia psychosis comparison (n=47) groups, as well as unaffected first-degree relatives of individuals with schizophrenia (n=31). Context-processing ability assessed by performance on the AX-CPT (Continuous Performance Test) at baseline, 8 weeks, 6 months, and 1 year (relatives only at baseline). Reaction time, error rates and signal detection indices (d?-context) of context processing were analyzed. Linear discriminant analyses (LDA) on early timepoints (baseline, 8 weeks) were conducted to predict confirmatory diagnosis (schizophrenia vs. psychosis control) at 6 months. Schizophrenia patients showed evidence of impaired context-processing relative to both the healthy and psychosis comparator groups at baseline and continued through to 1 year. While context-processing impairments persisted in schizophrenia patients through one year, the impairments in psychosis controls, which were more modest at baseline, remitted at follow-up. First-degree relatives showed deficits that were intermediate between the schizophrenia and healthy control groups. LDA showed 67% classification rates for distinguishing schizophrenia from non-schizophrenia psychosis. The persistence, diagnostic specificity and association with genetic liability give support for context processing impairments serving as a cognitive endophenotype for schizophrenia and that evaluation of context processing could contribute to diagnostic assessments. PMID:23570894

Richard, Annette E.; Carter, Cameron S.; Cohen, Jonathan D.; Cho, Raymond Y.

2013-01-01

221

Target diagnostic control system implementation for the National Ignition Facility (invited)a)  

NASA Astrophysics Data System (ADS)

The extreme physics of targets shocked by NIF's 192-beam laser is observed by a diverse suite of diagnostics. Many diagnostics are being developed by collaborators at other sites, but ad hoc controls could lead to unreliable and costly operations. A diagnostic control system (DCS) framework for both hardware and software facilitates development and eases integration. Each complex diagnostic typically uses an ensemble of electronic instruments attached to sensors, digitizers, cameras, and other devices. In the DCS architecture each instrument is interfaced to a low-cost WINDOWS XP processor and JAVA application. Each instrument is aggregated with others as needed in the supervisory system to form an integrated diagnostic. The JAVA framework provides data management, control services, and operator graphical user interface generation. DCS instruments are reusable by replication with reconfiguration for specific diagnostics in extensible markup language. Advantages include minimal application code, easy testing, and high reliability. Collaborators save costs by assembling diagnostics with existing DCS instruments. This talk discusses target diagnostic instrumentation used on NIF and presents the DCS architecture and framework.

Shelton, R. T.; Kamperschroer, J. H.; Lagin, L. J.; Nelson, J. R.; O'Brien, D. W.

2010-10-01

222

Diagnostic method of welding process based on fused infrared and vision images  

NASA Astrophysics Data System (ADS)

The article deals with a method of diagnosing GMA welding process, based on the analysis of fused infrared and vision images of a welding arc. The proposed method consists of a few fundamental steps such as acquisition, pre-processing, fusion, post-processing, analysis and recognition of acquired images. The recognition phase is based on diagnostic signals being waveforms of relevant features extracted from the fused images. The authors proposed original approaches to the analysis of fused images. The article describes each step of the proposed method in the context of the authors' research, performed on the basis of sequences of infrared and vision images gathered during a series of laboratory experiments where different welding instabilities were simulated.

Fidali, Marek; Jamrozik, Wojciech

2013-11-01

223

Fault Diagnostic System for a Multilevel Inverter Using a Neural Network  

Microsoft Academic Search

In this paper, a fault diagnostic system in a multilevel-inverter using a neural network is developed. It is difficult to diagnose a multilevel-inverter drive (MLID) system using a mathematical model because MLID systems consist of many switching devices and their system complexity has a nonlinear factor. Therefore, a neural network classification is applied to the fault diagnosis of a MLID

Surin Khomfoi; Leon M. Tolbert

2007-01-01

224

Power and process control systems  

Microsoft Academic Search

This book contains the following chapters: Introduction to process control: Instrumentation, Identification, and Control; Standard-Form PID Controller Tuning; Dynamic Energy and Optimization; Drum Level Control in High-Pressure Steam Boilers; Cogeneration Power Plant Dynamics and Control; Power System Control and Operation; Power-Frequency Control in Electrical Energy Systems; Power Plant Dynamic Control; and Stability and Synchronization.

Polonyi

1991-01-01

225

Evaluation Of The Diagnostic Performance Of A Multimedia Medical Communications System.  

NASA Astrophysics Data System (ADS)

The central concern of radiologists when evaluating Picture Archiving Communication System (PACS) is the diagnostic performance of digital images compared to the original analog versions of the same images. Considerable work has been done comparing the ROC curves of various types of digital systems to the corresponding analog systems for the detection of specific phantoms or diseases. Although the studies may notify the radiologists that for a specific lesion a digital system may perform as well as the analog system, it tells the radiologists very little about the impact on diagnostic performance of a digital system in the general practice of radiology. We describe in this paper an alternative method for evaluating the diagnostic performance of a digital system and a preliminary experiment we conducted to test the methodology.

Robertson, John G.; Coristine, Marjorie; Goldberg, Morris; Beeton, Carolyn; Belanger, Garry; Tombaugh, Jo W.; Hickey, Nancy M.; Millward, Steven F.; Davis, Michael; Whittingham, David

1989-05-01

226

A pinhole diagnostics system for measurement of aberrations at the Argonne National Laboratory Neutral Particle Beam Test Stand  

SciTech Connect

The primary beam characterization device at the Argonne National Laboratory Neutral Particle Beam Test Stand is a pinhole diagnostics system. Characteristics of the system, its uses, and illustrative examples of pinhole diagnostics measurements are discussed. In addition, an approach for comparing pinhole diagnostics measurements with results from the WAFFOG beam sensor is presented.

Curry, B.P.; Novick, A.H.; Coleman, T.A.; Micklich, B.J.

1990-01-01

227

Laser-based systems for the structural diagnostic of artwork: an application to XVII-century Byzantine icons  

Microsoft Academic Search

Laser diagnostic systems based on shearography, vibrometry, and holography principles were employed to investigate the potential implementation of laser techniques in art conservation structural diagnostic field. The employed techniques offered the required measuring variability to allow a first discrimination on complex diagnostic uncertainties encountered often in art conservation. The systems were tested and used to assess the structural condition of

Vivi Tornari; Antonia Bonarou; Paolo Castellini; Enrico Esposito; Wolfgang Osten; Michael K. Kalms; Nikos Smyrnakis; Stergios Stasinopulos

2001-01-01

228

Development of simple designs of multitip probe diagnostic systems for RF plasma characterization.  

PubMed

Multitip probes are very useful diagnostics for analyzing and controlling the physical phenomena occurring in low temperature discharge plasmas. However, DC biased probes often fail to perform well in processing plasmas. The objective of the work was to deduce simple designs of DC biased multitip probes for parametric study of radio frequency plasmas. For this purpose, symmetric double probe, asymmetric double probe, and symmetric triple probe diagnostic systems and their driving circuits were designed and tested in an inductively coupled plasma (ICP) generated by a 13.56 MHz radio frequency (RF) source. Using I-V characteristics of these probes, electron temperature, electron number density, and ion saturation current was measured as a function of input power and filling gas pressure. An increasing trend was noticed in electron temperature and electron number density for increasing input RF power whilst a decreasing trend was evident in these parameters when measured against filling gas pressure. In addition, the electron energy probability function (EEPF) was also studied by using an asymmetric double probe. These studies confirmed the non-Maxwellian nature of the EEPF and the presence of two groups of the energetic electrons at low filling gas pressures. PMID:24683326

Naz, M Y; Shukrullah, S; Ghaffar, A; Rehman, N U

2014-01-01

229

Plasma Diagnostics For The Investigation of Silane Based Glow Discharge Deposition Processes  

NASA Astrophysics Data System (ADS)

In this work is presented the study of microcrystalline silicon PECVD process through highly diluted silane in hydrogen discharges. The investigation is performed by applying different non intrusive plasma diagnostics (electrical, optical, mass spectrometric and laser interferometric measurements). Each of these measurements is related to different plasma sub-processes (gas physics, plasma chemistry and plasma surface interaction) and compose a complete set, proper for the investigation of the effect of external discharge parameters on the deposition processes. In the specific case these plasma diagnostics are applied for prospecting the optimal experimental conditions from the ic-Si:H deposition rate point of view. Namely, the main characteristics of the effect of frequency, discharge geometry, power consumption and total gas pressure on the deposition process are presented successively. Special attention is given to the study of the frequency effect (13.56 MHz 50 MHz) indicating that the correct way to compare results of different driving frequency discharges is by maintaining constant the total power dissipation in the discharge. The important role of frequency in the achievement of high deposition rates and on the optimization of all other parameters is underlined. Finally, the proper combination of experimental conditions that result from the optimal choice of each of the above-mentioned discharge parameters and lead to high microcrystalline silicon deposition rates (7.5 Å/sec) is presented. The increase of silane dissociation rate towards neutral radicals (frequency effect), the contribution of highly sticking to the surface radicals (discharge geometry optimum) and the controlled production of higher radicals through secondary gas phase reactions (total gas pressure), are presented as prerequisites for the achievement of high deposition rates.

Mataras, Dimitrios

2001-10-01

230

Active spectroscopic measurements using the ITER diagnostic system  

SciTech Connect

Active (beam-based) spectroscopic measurements are intended to provide a number of crucial parameters for the ITER device being built in Cadarache, France. These measurements include the determination of impurity ion temperatures, absolute densities, and velocity profiles, as well as the determination of the plasma current density profile. Because ITER will be the first experiment to study long timescale ({approx}1 h) fusion burn plasmas, of particular interest is the ability to study the profile of the thermalized helium ash resulting from the slowing down and confinement of the fusion alphas. These measurements will utilize both the 1 MeV heating neutral beams and a dedicated 100 keV hydrogen diagnostic neutral beam. A number of separate instruments are being designed and built by several of the ITER partners to meet the different spectroscopic measurement needs and to provide the maximum physics information. In this paper, we describe the planned measurements, the intended diagnostic ensemble, and we will discuss specific physics and engineering challenges for these measurements in ITER.

Thomas, D. M. [ITER Organization, 13067 St. Paul-lez-Durance Cedex (France); Counsell, G. [Fusion for Energy, 08019 Barcelona (Spain); Johnson, D. [US ITER Project Office, Oak Ridge, Tennessee 37830 (United States); Vasu, P. [Institute for Plasma Research, Bhat, Gandhinagar 382428 (India); Zvonkov, A. [Russian Research Center ''Kurchatov Institute'', Moscow 123182 (Russian Federation)

2010-10-15

231

Attitude Determination and Control System (ADCS) and Maintenance and Diagnostic System (MDS): A maintenance and diagnostic system for Space Station Freedom  

NASA Technical Reports Server (NTRS)

The Maintenance and Diagnostic System (MDS) that is being developed at Honeywell to enhance the Fault Detection Isolation and Recovery system (FDIR) for the Attitude Determination and Control System on Space Station Freedom is described. The MDS demonstrates ways that AI-based techniques can be used to improve the maintainability and safety of the Station by helping to resolve fault anomalies that cannot be fully determined by built-in-test, by providing predictive maintenance capabilities, and by providing expert maintenance assistance. The MDS will address the problems associated with reasoning about dynamic, continuous information versus only about static data, the concerns of porting software based on AI techniques to embedded targets, and the difficulties associated with real-time response. An initial prototype was built of the MDS. The prototype executes on Sun and IBM PS/2 hardware and is implemented in the Common Lisp; further work will evaluate its functionality and develop mechanisms to port the code to Ada.

Toms, David; Hadden, George D.; Harrington, Jim

1990-01-01

232

Evaluation of a vibration diagnostic system for the detection of spur gear pitting failures  

NASA Technical Reports Server (NTRS)

A vibration diagnostic system was used to detect spur gear surface pitting fatigue in a closed-loop spur gear fatigue test rig. The diagnostic system, comprising a personal computer with an analog-to-digital conversion board, a diagnostic system unit, and software, uses time-synchronous averaging of the vibration signal to produce a vibration image of each tooth on any gear in a transmission. Several parameters were analyzed including gear pair stress wave and raw baseband vibration, kurtosis, peak ratios, and others. The system provides limits for the various parameters and gives a warning when the limits are exceeded. Several spur gear tests were conducted with this system and vibration data analyzed at 5-min. intervals. The results presented herein show that the system is fairly effective at detecting spur gear tooth surface fatigue pitting failures.

Townsend, Dennis P.; Zakrajsek, James J.

1993-01-01

233

Comparison of the results of soil profiles' diagnostics performed in three classification systems  

NASA Astrophysics Data System (ADS)

Three soil classification systems—the World Reference Base for Soil Resources (WRB), Soil Taxonomy, and the recent Russian system—were used for the identification of 17 soil profiles in southwestern Poland; all the systems put emphasis on the soil properties as diagnostic criteria. Different soils developed on glaciofluvial plains, loessic uplands, and in the Sudetes Mountains were classified. The best correlation between the classification decisions in the different systems was obtained for the most widespread soils owing to the similarity of the diagnostic criteria, which were essentially close although not coinciding. The most prominent divergence between the systems in both the names and the taxonomic categories of the soils was found for the polygenetic soils and for the soils developing from the lithologically discontinuous parent materials. It was also found that the diagnostic elements differ in terms of their taxonomic importance among the classification systems.

Gerasimova, M. I.; Khitrov, N. B.

2012-12-01

234

Parallel processing spacecraft communication system  

NASA Technical Reports Server (NTRS)

An uplink controlling assembly speeds data processing using a special parallel codeblock technique. A correct start sequence initiates processing of a frame. Two possible start sequences can be used; and the one which is used determines whether data polarity is inverted or non-inverted. Processing continues until uncorrectable errors are found. The frame ends by intentionally sending a block with an uncorrectable error. Each of the codeblocks in the frame has a channel ID. Each channel ID can be separately processed in parallel. This obviates the problem of waiting for error correction processing. If that channel number is zero, however, it indicates that the frame of data represents a critical command only. That data is handled in a special way, independent of the software. Otherwise, the processed data further handled using special double buffering techniques to avoid problems from overrun. When overrun does occur, the system takes action to lose only the oldest data.

Bolotin, Gary S. (Inventor); Donaldson, James A. (Inventor); Luong, Huy H. (Inventor); Wood, Steven H. (Inventor)

1998-01-01

235

Eye tracking users of a visual diagnostic clinical decision support system to discover decision-making strategies and to inform user interface design.  

PubMed

Clinical decision support systems (CDSS) assist physicians and other medical professionals in tasks such as differential diagnosis. End users may use different decision-making strategies depending on medical training. Study of eye movements reveals information processing strategies that are executed at a level below consciousness. Eye tracking of student physician assistants and medical residents, while using a visual diagnostic CDSS in diagnostic tasks, showed adoption of distinct strategies and informed recommendations for effective user interface design. PMID:18999126

Haake, Anne R; Pelz, Jeff B; Smagner, Jessica; Colombo, Daniel; Lindsay, Laura; Papier, Art

2008-01-01

236

An evidence-based diagnostic classification system for low back pain  

PubMed Central

Introduction: While clinicians generally accept that musculoskeletal low back pain (LBP) can arise from specific tissues, it remains difficult to confirm specific sources. Methods: Based on evidence supported by diagnostic utility studies, doctors of chiropractic functioning as members of a research clinic created a diagnostic classification system, corresponding exam and checklist based on strength of evidence, and in-office efficiency. Results: The diagnostic classification system contains one screening category, two pain categories: Nociceptive, Neuropathic, one functional evaluation category, and one category for unknown or poorly defined diagnoses. Nociceptive and neuropathic pain categories are each divided into 4 subcategories. Conclusion: This article describes and discusses the strength of evidence surrounding diagnostic categories for an in-office, clinical exam and checklist tool for LBP diagnosis. The use of a standardized tool for diagnosing low back pain in clinical and research settings is encouraged. PMID:23997245

Vining, Robert; Potocki, Eric; Seidman, Michael; Morgenthal, A. Paige

2013-01-01

237

A pulsed-laser calibration system for the laser backscatter diagnostics at the Omega laser  

SciTech Connect

A calibration system has been developed that allows a direct determination of the sensitivity of the laser backscatter diagnostics at the Omega laser. A motorized mirror at the target location redirects individual pulses of a mJ-class laser onto the diagnostic to allow the in-situ measurement of the local point response of the backscatter diagnostics. Featuring dual wavelength capability at the 2nd and 3rd harmonic of the Nd:YAG laser, both spectral channels of the backscatter diagnostics can be directly calibrated. In addition, channel cross-talk and polarization sensitivity can be determined. The calibration system has been employed repeatedly over the last two years and has enabled precise backscatter measurements of both stimulated Brillouin scattering and stimulated Raman scattering in gas-filled hohlraum targets that emulate conditions relevant to those in inertial confinement fusion targets.

Neumayer, P; Sorce, C; Froula, D H; Rekow, V; Loughman, K; Knight, R; Glenzer, S H; Bahr, R; Seka, W

2008-04-29

238

A pulsed-laser calibration system for the laser backscatter diagnostics at the Omega laser  

SciTech Connect

A calibration system has been developed that allows a direct determination of the sensitivity of the laser backscatter diagnostics at the Omega laser. A motorized mirror at the target location redirects individual pulses of a mJ-class laser onto the diagnostic to allow the in-situ measurement of the local point response of the backscatter diagnostics. Featuring dual wavelength capability at the 2nd and 3rd harmonic of the Nd:YAG laser, both spectral channels of the backscatter diagnostics can be directly calibrated. In addition, channel cross-talk and polarization sensitivity can be determined. The calibration system has been employed repeatedly over the last two years and has enabled precise backscatter measurements of both stimulated Brillouin scattering and stimulated Raman scattering in gas-filled hohlraum targets that emulate conditions relevant to those in inertial confinement fusion targets.

Neumayer, P; Sorce, C; Froula, D H; Rekow, V; Loughman, K; Knight, R; Glenzer, S H; Bahr, R; Seka, W

2009-10-09

239

Bayesian ANN Classifier for ECG Arrhythmia Diagnostic System: A Comparison Study  

E-print Network

Bayesian ANN Classifier for ECG Arrhythmia Diagnostic System: A Comparison Study Dayong Gao-- This paper outlines a system for detection of car- diac arrhythmias within ECG signals, based on a Bayesian to select the optimum model. The system is evaluated using noisy ECG data, to simulate a real- world

Madden, Michael

240

A Theory of Meta-Diagnosis: Reasoning about Diagnostic Systems Nuno Belard 1,2,3  

E-print Network

of a real-world system and some observa- tions. Contrary to classical hypothesis, in real- world of a real-world system under study. In model-based diagnosis from first principles [Reiter, 1987][de Kleer and Williams, 1987] a diagnostic algorithm computes diagnoses using a model of the real-world system and some

Pencolé, Yannick

241

Electric machinery diagnostic\\/testing system and power hardware-in-the-loop studies  

Microsoft Academic Search

This paper presents an electric machinery diagnostics (EMDS) system that improves on the traditional methods of either using simulation of a power system and its component or scaled down physical models to diagnose faults in hardware under test (HUT). The EMDS couples actual power hardware to a virtual simulation of the power system through a sim-stim interface (SSI) which sources

Saffet Ayasun; Sean Vallieu; Robert Fischl; Tom Chmielewski

2003-01-01

242

Dual waveband signal processing system  

NASA Astrophysics Data System (ADS)

A Dual Waveband Signal Processing System (DWSPS) is disclosed for differentiating between an primary target signal and background clutter to detect targets and objects with a particularly unique spectral characteristic. The DWSPS is responsive to a plurality of sensors operating on different wavelengths. The output wavebands of the sensors are filtered by either spatial or temporal high-pass filters, and is processed through a network comprising a series of multipliers, dividers, comparators, and subtractors to obtain the weighted correlation functions or Alpha Coefficients, which, when compared to the input wavebands, produces a filtered or processed output signal of the detected features.

Pauli, Myron; Inderhess, John; Katz, Garry; Faraedrich, Doug; Nordmeyer, Dan

1992-06-01

243

Teaching dual-process diagnostic reasoning to doctor of nursing practice students: problem-based learning and the illness script.  

PubMed

Accelerating the development of diagnostic reasoning skills for nurse practitioner students is high on the wish list of many faculty. The purpose of this article is to describe how the teaching strategy of problem-based learning (PBL) that drills the hypothetico-deductive or analytic reasoning process when combined with an assignment that fosters pattern recognition (a nonanalytic process) teaches and reinforces the dual process of diagnostic reasoning. In an online Doctor of Nursing Practice program, four PBL cases that start with the same symptom unfold over 2 weeks. These four cases follow different paths as they unfold leading to different diagnoses. Culminating each PBL case, a unique assignment called an illness script was developed to foster the development of pattern recognition. When combined with hypothetico-deductive reasoning drilled during the PBL case, students experience the dual process approach to diagnostic reasoning used by clinicians. [J Nurs Educ. 2014;53(11):646-650.]. PMID:25350904

Durham, Catherine O; Fowler, Terri; Kennedy, Sally

2014-11-01

244

Diagnostic Overshadowing and Other Challenges Involved in the Diagnostic Process of Patients with Mental Illness Who Present in Emergency Departments with Physical Symptoms - A Qualitative Study  

PubMed Central

We conducted a qualitative study in the Emergency Departments (EDs) of four hospitals in order to investigate the perceived scope and causes of ‘diagnostic overshadowing’ – the misattribution of physical symptoms to mental illness – and other challenges involved in the diagnostic process of people with mental illness who present in EDs with physical symptoms. Eighteen doctors and twenty-one nurses working in EDs and psychiatric liaisons teams in four general hospitals in the UK were interviewed. Interviewees were asked about cases in which mental illness interfered with diagnosis of physical problems and about other aspects of the diagnostic process. Interviews were transcribed and analysed thematically. Interviewees reported various scenarios in which mental illness or factors related to it led to misdiagnosis or delayed treatment with various degrees of seriousness. Direct factors which may lead to misattribution in this regard are complex presentations or aspects related to poor communication or challenging behaviour of the patient. Background factors are the crowded nature of the ED environment, time pressures and targets and stigmatising attitudes held by a minority of staff. The existence of psychiatric liaison team covering the ED twenty-four hours a day, seven days a week, can help reduce the risk of misdiagnosis of people with mental illness who present with physical symptoms. However, procedures used by emergency and psychiatric liaison staff require fuller operationalization to reduce disagreement over where responsibilities lie. PMID:25369130

Shefer, Guy; Henderson, Claire; Howard, Louise M.; Murray, Joanna; Thornicroft, Graham

2014-01-01

245

Digital signal processing of cylinder pressure data for combustion diagnostics of HCCI engine  

NASA Astrophysics Data System (ADS)

Diagnosis of combustion is necessary for the estimation of the combustion quality, and control of combustion timing in advanced combustion concepts like HCCI. Combustion diagnostics is often performed using digital processing of pressure signals measured using piezoelectric sensor installed in the combustion chamber of the engine. Four-step pressure signal processing consisting of (i) absolute pressure correction, (ii) phasing w.r.t. crank angle, (iii) cycle averaging and (iv) smoothening is used to get cylinder pressure data from the engine experiments, which is further analyzed to get information about combustion characteristics. This study focuses on various aspect of signal processing (cycle averaging and smoothing) of in-cylinder pressure signal from a HCCI engine acquired using a piezoelectric pressure sensor. Experimental investigations are conducted on a HCCI combustion engine operating at different engine speed/load/air-fuel ratio conditions. The cylinder pressure history of 3000 consecutive engine cycles is acquired for analysis using piezoelectric pressure sensor. This study determines the optimum number of engine cycles to be acquired for reasonably good pressure signals based on standard deviation of in-cylinder pressure, rate of pressure rise and rate of heat release signals. Different signal smoothening methods (using various digital filters) are also analyzed and their results are compared. This study also presents effect of signal processing methods on pressure, pressure rise rate and rate of heat release curves at different engine operating conditions.

Kumar Maurya, Rakesh; Pal, Dev Datt; Kumar Agarwal, Avinash

2013-03-01

246

Nonintrusive Load Monitoring and Diagnostics in Power Systems  

Microsoft Academic Search

This paper describes a transient event classification scheme, system identification techniques, and implementation for use in nonintrusive load monitoring. Together, these techniques form a system that can determine the operating schedule and find parameters of physical models of loads that are connected to an AC or DC power distribution system. The monitoring system requires only off-the-shelf hardware and recognizes individual

Steven R. Shaw; Steven B. Leeb; Leslie K. Norford; Robert W. Cox

2008-01-01

247

Synthesis of Tailored Nanoparticles in Flames: Chemical Kinetics, In Situ Diagnostics, Numerical Simulation, and Process Development  

NASA Astrophysics Data System (ADS)

Flame synthesis of nanoparticles provides access to a wide variety of metal oxide nanoparticles. Detailed understanding of the underlying fundamental processes is a prerequisite for the synthesis of specific materials with well-defined properties. Multiple steps from gas-phase chemistry, inception of first particles and particle growth are thus investigated in detail to provide the information required for setting up chemistry and particle dynamics models that allow simulating particle synthesis apparatus. Experiments are carried out in shock wave and flow reactors with in situ optical diagnostics, such as absorption, laser-induced fluorescence, and laser-induced incandescence, with in-line sampling via mass spectrometry as well as with thermophoretic sampling for ex situ microscopic analysis and electronic characterization. Focus is on tuning particle size as well as crystallinity and stoichiometry, with a specific focus on sub-stoichiometric materials with tunable composition.

Wiggers, Hartmut; Fikri, Mustapha; Wlokas, Irenaeus; Roth, Paul; Schulz, Christof

248

Note: Neutron bang time diagnostic system on Shenguang-III prototype  

NASA Astrophysics Data System (ADS)

A neutron bang time (NBT) diagnostic system has been implemented on Shenguang-III prototype. The bang time diagnostic system is based on a sensitive fusion neutron detector, which consists of a plastic scintillator and a micro-channel plate photomultiplier tube (PMT). An optical fiber bundle is used to couple the scintillator and the PMT. The bang time system is able to measure bang time above a neutron yield of 107. Bang times and start time of laser were related by probing x-ray pulses produced by 200 ps laser irradiating golden targets. Timing accuracy of the NBT is better than 60 ps.

Tang, Qi; Chen, Jiabin; Liu, Zhongjie; Zhan, Xiayu; Song, Zifeng

2014-04-01

249

Mutual tests using immunity-based diagnostic mobile agents in distributed intrusion detection systems  

Microsoft Academic Search

Distributed intrusion detection systems have several advantages over centralized systems, such as scalability, adaptability,\\u000a and fault tolerance. A current research topic in distributed systems is self-monitoring to identify corrupted intrusion detection\\u000a systems. One way of self-monitoring is for intrusion detection systems to check each other. As we describe herein, this can\\u000a be done by mobile agents using an immunity-based diagnostic

Yuji Watanabe; Yoshiteru Ishida

2004-01-01

250

Shipboard fluid system diagnostics using non-intrusive load monitoring  

E-print Network

Systems on modem naval vessels are becoming exclusively dependent on electrical power. One example of this is the replacement of distilling and evaporator plants with reverse osmosis units. As the system is in continuous ...

Mitchell, Gregory R. (Gregory Reed)

2007-01-01

251

A CLIPS based personal computer hardware diagnostic system  

NASA Technical Reports Server (NTRS)

Often the person designated to repair personal computers has little or no knowledge of how to repair a computer. Described here is a simple expert system to aid these inexperienced repair people. The first component of the system leads the repair person through a number of simple system checks such as making sure that all cables are tight and that the dip switches are set correctly. The second component of the system assists the repair person in evaluating error codes generated by the computer. The final component of the system applies a large knowledge base to attempt to identify the component of the personal computer that is malfunctioning. We have implemented and tested our design with a full system to diagnose problems for an IBM compatible system based on the 8088 chip. In our tests, the inexperienced repair people found the system very useful in diagnosing hardware problems.

Whitson, George M.

1991-01-01

252

Image based diagnostic aid system for interstitial lung diseases  

Microsoft Academic Search

Automatic classification of lung tissue patterns in high-resolution computed tomography (HRCT) images of patients affected with interstitial lung diseases (ILD) is an important stage in the construction of a computer-aided diagnosis system. In this study, we propose a new image based system for classification of lung tissue patterns. The proposed system comprises three stages. In the first stage, the parenchyma

Azar Tolouee; Hamid Abrishami Moghaddam; Mohamad Forouzanfar; Masoumeh Gity; Rahil Garnavi

2011-01-01

253

Operational modelling to guide implementation and scale-up of diagnostic tests within the health system: exploring opportunities for parasitic disease diagnostics based on example application for tuberculosis.  

PubMed

SUMMARY Research and innovation in the diagnosis of infectious and parasitic diseases has led to the development of several promising diagnostic tools, for example in malaria there is extensive literature concerning the use of rapid diagnostic tests. This means policymakers in many low and middle income countries need to make difficult decisions about which of the recommended tools and approaches to implement and scale-up. The test characteristics (e.g. sensitivity and specificity) of the tools alone are not a sufficient basis on which to make these decisions as policymakers need to also consider the best combination of tools, whether the new tools should complement or replace existing diagnostics and who should be tested. Diagnostic strategies need dovetailing to different epidemiology and structural resource constraints (e.g. existing diagnostic pathways, human resources and laboratory capacity). We propose operational modelling to assist with these complex decisions. Projections of patient, health system and cost impacts are essential and operational modelling of the relevant elements of the health system could provide these projections and support rational decisions. We demonstrate how the technique of operational modelling applied in the developing world to support decisions on diagnostics for tuberculosis, could in a parallel way, provide useful insights to support implementation of appropriate diagnostic innovations for parasitic diseases. PMID:25035934

Langley, Ivor; Adams, Emily; Doulla, Basra; Squire, S Bertel

2014-12-01

254

Diagnostic Teaching  

ERIC Educational Resources Information Center

Contends that teaching would be more effective if it became "diagnostic" teaching, that such teaching is not possible unless backed up with an adequate system of record keeping by the teacher, and that, conversely, the establishment by a school of such a record keeping system is likely to encourage diagnostic teaching. (Author/RK)

Cooper, Keith

1977-01-01

255

An integrated real-time diagnostic concept using expert systems, qualitative reasoning and quantitative analysis  

SciTech Connect

An approach for an integrated real-time diagnostic system is being developed for inclusion as an integral part of a power plant automatic control system. In order to participate in control decisions and automatic closed loop operation, the diagnostic system must operate in real-time. Thus far, an expert system with real-time capabilities has been developed and installed on a subsystem at the Experimental Breeder Reactor (EBR-II) in Idaho, USA. Real-time simulation testing of advanced power plant concepts at the Pennsylvania State University has been developed and was used to support the expert system development and installation at EBR-II. Recently, the US National Science Foundation (NSF) and the US Department of Energy (DOE) have funded a Penn State research program to further enhance application of real-time diagnostic systems by pursuing implementation in a distributed power plant computer system including microprocessor based controllers. This paper summarizes past, current, planned, and possible future approaches to power plant diagnostic systems research at Penn State. 34 refs., 9 figs.

Edwards, R.M.; Lee, K.Y.; Kumara, S.; Levine, S.H.

1989-01-01

256

LASERNET-the multi-user system for acquisition and laser printing of medical diagnostic images  

Microsoft Academic Search

The article describes a computer aided medical system working with wide range of medical scanning equipment and intended for laser printing of diagnostic images. The system includes inexpensive reliable equipment, accepts images in wide range of formats, by wide range of transport protocols, provides high quality of printed images on format films with low expenses, may be used as a

E. Breger

1996-01-01

257

A diagnostic expert system for the nuclear power plant b ased on the hybrid knowledge approach  

Microsoft Academic Search

A diagnostic expert system, the hybrid knowledge based plant operation supporting system (HYPOSS), which has been developed to support operators' decisionmaking during the transients of the nuclear power plant, is described. HYPOSS adopts the hybrid knowledge approach, which combines both shallow and deep knowledge to take advantage of the merits of both approaches. In HYPOSS, four types of knowledge are

J. O. Yang; Soon Heung Chang

1989-01-01

258

A handheld point-of-care genomic diagnostic system.  

PubMed

The rapid detection and identification of infectious disease pathogens is a critical need for healthcare in both developed and developing countries. As we gain more insight into the genomic basis of pathogen infectivity and drug resistance, point-of-care nucleic acid testing will likely become an important tool for global health. In this paper, we present an inexpensive, handheld, battery-powered instrument designed to enable pathogen genotyping in the developing world. Our Microfluidic Biomolecular Amplification Reader (µBAR) represents the convergence of molecular biology, microfluidics, optics, and electronics technology. The µBAR is capable of carrying out isothermal nucleic acid amplification assays with real-time fluorescence readout at a fraction of the cost of conventional benchtop thermocyclers. Additionally, the µBAR features cell phone data connectivity and GPS sample geotagging which can enable epidemiological surveying and remote healthcare delivery. The µBAR controls assay temperature through an integrated resistive heater and monitors real-time fluorescence signals from 60 individual reaction chambers using LEDs and phototransistors. Assays are carried out on PDMS disposable microfluidic cartridges which require no external power for sample loading. We characterize the fluorescence detection limits, heater uniformity, and battery life of the instrument. As a proof-of-principle, we demonstrate the detection of the HIV-1 integrase gene with the µBAR using the Loop-Mediated Isothermal Amplification (LAMP) assay. Although we focus on the detection of purified DNA here, LAMP has previously been demonstrated with a range of clinical samples, and our eventual goal is to develop a microfluidic device which includes on-chip sample preparation from raw samples. The µBAR is based entirely around open source hardware and software, and in the accompanying online supplement we present a full set of schematics, bill of materials, PCB layouts, CAD drawings, and source code for the µBAR instrument with the goal of spurring further innovation toward low-cost genetic diagnostics. PMID:23936402

Myers, Frank B; Henrikson, Richard H; Bone, Jennifer M; Bone, Jennifer; Lee, Luke P

2013-01-01

259

A Handheld Point-of-Care Genomic Diagnostic System  

PubMed Central

The rapid detection and identification of infectious disease pathogens is a critical need for healthcare in both developed and developing countries. As we gain more insight into the genomic basis of pathogen infectivity and drug resistance, point-of-care nucleic acid testing will likely become an important tool for global health. In this paper, we present an inexpensive, handheld, battery-powered instrument designed to enable pathogen genotyping in the developing world. Our Microfluidic Biomolecular Amplification Reader (µBAR) represents the convergence of molecular biology, microfluidics, optics, and electronics technology. The µBAR is capable of carrying out isothermal nucleic acid amplification assays with real-time fluorescence readout at a fraction of the cost of conventional benchtop thermocyclers. Additionally, the µBAR features cell phone data connectivity and GPS sample geotagging which can enable epidemiological surveying and remote healthcare delivery. The µBAR controls assay temperature through an integrated resistive heater and monitors real-time fluorescence signals from 60 individual reaction chambers using LEDs and phototransistors. Assays are carried out on PDMS disposable microfluidic cartridges which require no external power for sample loading. We characterize the fluorescence detection limits, heater uniformity, and battery life of the instrument. As a proof-of-principle, we demonstrate the detection of the HIV-1 integrase gene with the µBAR using the Loop-Mediated Isothermal Amplification (LAMP) assay. Although we focus on the detection of purified DNA here, LAMP has previously been demonstrated with a range of clinical samples, and our eventual goal is to develop a microfluidic device which includes on-chip sample preparation from raw samples. The µBAR is based entirely around open source hardware and software, and in the accompanying online supplement we present a full set of schematics, bill of materials, PCB layouts, CAD drawings, and source code for the µBAR instrument with the goal of spurring further innovation toward low-cost genetic diagnostics. PMID:23936402

Myers, Frank B.; Henrikson, Richard H.; Bone, Jennifer; Lee, Luke P.

2013-01-01

260

Decentralized diagnostics based on a distributed micro-genetic algorithm for transducer networks monitoring large experimental systems.  

PubMed

Evolutionary approach to centralized multiple-faults diagnostics is extended to distributed transducer networks monitoring large experimental systems. Given a set of anomalies detected by the transducers, each instance of the multiple-fault problem is formulated as several parallel communicating sub-tasks running on different transducers, and thus solved one-by-one on spatially separated parallel processes. A micro-genetic algorithm merges evaluation time efficiency, arising from a small-size population distributed on parallel-synchronized processors, with the effectiveness of centralized evolutionary techniques due to optimal mix of exploitation and exploration. In this way, holistic view and effectiveness advantages of evolutionary global diagnostics are combined with reliability and efficiency benefits of distributed parallel architectures. The proposed approach was validated both (i) by simulation at CERN, on a case study of a cold box for enhancing the cryogeny diagnostics of the Large Hadron Collider, and (ii) by experiments, under the framework of the industrial research project MONDIEVOB (Building Remote Monitoring and Evolutionary Diagnostics), co-funded by EU and the company Del Bo srl, Napoli, Italy. PMID:25273768

Arpaia, P; Cimmino, P; Girone, M; Commara, G La; Maisto, D; Manna, C; Pezzetti, M

2014-09-01

261

Decentralized diagnostics based on a distributed micro-genetic algorithm for transducer networks monitoring large experimental systems  

NASA Astrophysics Data System (ADS)

Evolutionary approach to centralized multiple-faults diagnostics is extended to distributed transducer networks monitoring large experimental systems. Given a set of anomalies detected by the transducers, each instance of the multiple-fault problem is formulated as several parallel communicating sub-tasks running on different transducers, and thus solved one-by-one on spatially separated parallel processes. A micro-genetic algorithm merges evaluation time efficiency, arising from a small-size population distributed on parallel-synchronized processors, with the effectiveness of centralized evolutionary techniques due to optimal mix of exploitation and exploration. In this way, holistic view and effectiveness advantages of evolutionary global diagnostics are combined with reliability and efficiency benefits of distributed parallel architectures. The proposed approach was validated both (i) by simulation at CERN, on a case study of a cold box for enhancing the cryogeny diagnostics of the Large Hadron Collider, and (ii) by experiments, under the framework of the industrial research project MONDIEVOB (Building Remote Monitoring and Evolutionary Diagnostics), co-funded by EU and the company Del Bo srl, Napoli, Italy.

Arpaia, P.; Cimmino, P.; Girone, M.; Commara, G. La; Maisto, D.; Manna, C.; Pezzetti, M.

2014-09-01

262

An Embedded Rule-Based Diagnostic Expert System in Ada  

NASA Technical Reports Server (NTRS)

Ada is becoming an increasingly popular programming language for large Government-funded software projects. Ada with it portability, transportability, and maintainability lends itself well to today's complex programming environment. In addition, expert systems have also assumed a growing role in providing human-like reasoning capability expertise for computer systems. The integration is discussed of expert system technology with Ada programming language, especially a rule-based expert system using an ART-Ada (Automated Reasoning Tool for Ada) system shell. NASA Lewis was chosen as a beta test site for ART-Ada. The test was conducted by implementing the existing Autonomous Power EXpert System (APEX), a Lisp-based power expert system, in ART-Ada. Three components, the rule-based expert systems, a graphics user interface, and communications software make up SMART-Ada (Systems fault Management with ART-Ada). The rules were written in the ART-Ada development environment and converted to Ada source code. The graphics interface was developed with the Transportable Application Environment (TAE) Plus, which generates Ada source code to control graphics images. SMART-Ada communicates with a remote host to obtain either simulated or real data. The Ada source code generated with ART-Ada, TAE Plus, and communications code was incorporated into an Ada expert system that reads the data from a power distribution test bed, applies the rule to determine a fault, if one exists, and graphically displays it on the screen. The main objective, to conduct a beta test on the ART-Ada rule-based expert system shell, was achieved. The system is operational. New Ada tools will assist in future successful projects. ART-Ada is one such tool and is a viable alternative to the straight Ada code when an application requires a rule-based or knowledge-based approach.

Jones, Robert E.; Liberman, Eugene M.

1992-01-01

263

Early evaluation of a second generation information monitoring and diagnostic system  

SciTech Connect

Private sector commercial office buildings are challenging environments for energy efficiency projects. This challenge is related to the complexity of business environments that involve ownership, operation, and tenant relationships. Whether it is poor quality design, inefficient operations, degradation of equipment over time, or merely the increasing use of energy by tenants and inattention from landlords, commercial office building energy use continues to increase. This research project was developed to examine the environment for building operations and identify causes of inefficient use of energy related to technical and organizational issues. This report discusses a second-generation Information Monitoring and Diagnostic System (IMDS) installed at a leased office building in Sacramento, California. The report begins with a brief summary of the IMDS research at the previous building, followed by a discussion of the building selection process, the IMDS design and installation, recent use of the IMDS, costs and benefits, and fault detection and diagnostic research using the IMDS. A web site describes the IMDS in detail (see imds.lbl.gov). The underlying principle of this research project is that high quality building performance data can help show where energy is being used and how buildings systems actually perform is an important first step toward improving building energy efficiency. The project utilizes a high-quality monitoring system that has been developed during the past decade by a partnership between LBNL and private industry. This research project has been successful in demonstrating that the IMDS is tremendously valuable to the building operators at the Sacramento site. The building operators not only accept the technology, but it has become the core of their day-to-day building control concepts. The innovative property management company, Jones Lang LaSalle, is interested in installing more sites to determine if the system could provide an economic platform for regional operations. One objective of this project was to install the IMDS and evaluate the costs and benefits of its use. The costs have been evaluated. The system cost about $0.70 per square foot, which includes the design, hardware, software, and installation, which is about 30% lower than the previous system in San Francisco. A number of operational problems have been identified with the IMDS as described in the report. Potential energy savings from addressing problems identified by the application of the IMDS have not yet been quantified, although the IMDS has been an important tool to the operations staff to help better assess planned future retrofits.

Piette, Mary Ann; Kinney, Satkartar; Bourassa, Norman; Xu, Peng; Haves, Philip; Kinney, Kristopher; Shockman, Christine

2002-03-25

264

Ethernet Based Embedded System for FEL Diagnostics and Controls.  

National Technical Information Service (NTIS)

An Ethernet based embedded system has been developed to upgrade the Beam Viewer and Beam Position Monitor (BPM) systems within the free-electron laser (FEL) project at Jefferson Lab. The embedded microcontroller was mounted on the front-end I/O cards with...

A. Grippo, D. Sexton, J. Yan, K. Jordan, W. Moore

2006-01-01

265

Navigating the diagnostics career labyrinth  

Microsoft Academic Search

Integrated diagnostics is a career field for which there currently exists no standard set of basic qualifications, few educational opportunities to study at the university level, no clear processes within most organizations for practicing integrated diagnostics as a systems engineering activity and often no uniform method of sharing techniques and lessons learned with new employees. Several authors have stated the

Russell Shannon; J. Quiter

2007-01-01

266

AVIRIS ground data processing system  

NASA Technical Reports Server (NTRS)

During the last year and a half, Feb. 1991 to Jun. 1992, a major upgrade of the Airborne Visible/Infrared Imaging Spectrometers (AVIRIS) ground data processing system took place. Both the hardware and software components were changed significantly to improve the processing capacity and performance and to structure a data facility capable of handling the projected work load into the near future. A summary report of these changes and some projections for the future are provided. The objectives of the AVIRIS data facility are to decommutate and archive AVIRIS data and to provide raw or radiometrically calibrated data products to the science investigator. These primary objectives have not changed from the initial concepts. The upgrade effort has greatly improved the processing system. These objectives can now be accomplished in a more timely fashion at a reasonable cost and there is sufficient capacity to manage the current processing load and provide for future growth. The method of implementation added the flexibility to provide better service to the investigator and allow for future changes.

Hansen, Earl G.; Larson, Steve; Novack, H. Ian; Bennett, Robert

1992-01-01

267

Parallel processing and expert systems  

NASA Technical Reports Server (NTRS)

Whether it be monitoring the thermal subsystem of Space Station Freedom, or controlling the navigation of the autonomous rover on Mars, NASA missions in the 90's cannot enjoy an increased level of autonomy without the efficient use of expert systems. Merely increasing the computational speed of uniprocessors may not be able to guarantee that real time demands are met for large expert systems. Speed-up via parallel processing must be pursued alongside the optimization of sequential implementations. Prototypes of parallel expert systems have been built at universities and industrial labs in the U.S. and Japan. The state-of-the-art research in progress related to parallel execution of expert systems was surveyed. The survey is divided into three major sections: (1) multiprocessors for parallel expert systems; (2) parallel languages for symbolic computations; and (3) measurements of parallelism of expert system. Results to date indicate that the parallelism achieved for these systems is small. In order to obtain greater speed-ups, data parallelism and application parallelism must be exploited.

Yan, Jerry C.; Lau, Sonie

1991-01-01

268

SERS diagnostic platforms, methods and systems microarrays, biosensors and biochips  

DOEpatents

A Raman integrated sensor system for the detection of targets including biotargets includes at least one sampling platform, at least one receptor probe disposed on the sampling platform, and an integrated circuit detector system communicably connected to the receptor. The sampling platform is preferably a Raman active surface-enhanced scattering (SERS) platform, wherein the Raman sensor is a SERS sensor. The receptors can include at least one protein receptor and at least one nucleic acid receptor.

Vo-Dinh, Tuan (Knoxville, TN)

2007-09-11

269

Continued Development of Expert System Tools for NPSS Engine Diagnostics  

NASA Technical Reports Server (NTRS)

The objectives of this grant were to work with previously developed NPSS (Numerical Propulsion System Simulation) tools and enhance their functionality; explore similar AI systems; and work with the High Performance Computing Communication (HPCC) K-12 program. Activities for this reporting period are briefly summarized and a paper addressing the implementation, monitoring and zooming in a distributed jet engine simulation is included as an attachment.

Lewandowski, Henry

1996-01-01

270

A diagnostic system for air brakes in commercial vehicles  

E-print Network

, cranes, conveyors, agitators, etc.), paint spraying, marine applications, pneumatic actuators, etc. [29]. One of the major applications of compressed air in the field of transportation has been in the development of the air brake system. In the United..., cranes, conveyors, agitators, etc.), paint spraying, marine applications, pneumatic actuators, etc. [29]. One of the major applications of compressed air in the field of transportation has been in the development of the air brake system. In the United...

Coimbatore Subramanian, Shankar Ram

2007-09-17

271

Model-based Diagnostics for Propellant Loading Systems Matthew Daigle  

E-print Network

-depth analysis and understanding of the underlying physi- cal processes, offer the advanced capability to quickly Dakota School of Mines and Technology Rapid City, SD 57701 michael.foygel@sdsmt.edu Vadim Smelyanskiy solutions are neces- sary to quickly identify when a fault occurs, so that recov- ery actions can be taken

Daigle, Matthew

272

A Diagnostic Decision Support System for BMP Selection in Small Urban Watersheds  

NASA Astrophysics Data System (ADS)

Overall water quality in the United States has improved since the establishment of the Clean Water Act in 1972. While waste water and other point source discharge treatments are expanding and improving in quality, non-point source pollution remains a problem. Best Management Practices (BMPs) are structural and nonstructural methods to mitigate these problems. Much attention has focused on non-point source pollutants in rural areas, where agricultural activities increase the nutrients (fertilizers), toxics (pesticides), and sediments in surface water. Urban and suburban areas also suffer from severe water quantity and quality problems, largely due to stormwater. Low Impact Development (LID), a series of spatially distributed and engineered small-scale hydrologic controls, is an appropriate approach to reduce flow rate and improve urban stormwater quality before it discharges into surface water bodies. This research sought to develop a Diagnostic Decision Support System (DDSS) for urban BMP/LID selection. The process-based hydrologic model, Soil and Water Assessment Tool (SWAT), was used to simulate the hydrologic processes and to estimate related water quality variables. A logic based simple method was developed to identify the critical water quality and quantity hotspots using the SWAT outputs for multiple Hydrologic Response Units (HRUs) within the study watershed. The DDSS consisted of two parts: a Diagnostic Expert System (DES), which identifies the most likely reasons for excessive pollutants; and a Prescriptive Expert System (PES), which selects the best set of spatially distributed BMPs. The DDSS is tested in Watts Branch, a small urban subwatershed in metropolitan Washington D.C. A SWAT model for the watershed was calibrated and validated first. The DDSS was then applied. The final selected series of BMPs was simulated again in the SWAT model for a ten-year period to quantify their effectiveness. The identified hotspots, possible reasons, and BMP solutions are visualized in GIS maps. The resulting BMP recommendations and maps will be useful in decision making and in developing appropriate educational material for residents and the general public. Mean Annual Sediment Yield Rate (Ton/ha) List of Candidate BMPs

Wang, Y.; Montas, H. J.; Leisnham, P.; Shirmohammadi, A.; Brubaker, K. L.; Reiling, S.

2013-12-01

273

Developmental trauma disorder: pros and cons of including formal criteria in the psychiatric diagnostic systems  

PubMed Central

Background This article reviews the current debate on developmental trauma disorder (DTD) with respect to formalizing its diagnostic criteria. Victims of abuse, neglect, and maltreatment in childhood often develop a wide range of age-dependent psychopathologies with various mental comorbidities. The supporters of a formal DTD diagnosis argue that post-traumatic stress disorder (PTSD) does not cover all consequences of severe and complex traumatization in childhood. Discussion Traumatized individuals are difficult to treat, but clinical experience has shown that they tend to benefit from specific trauma therapy. A main argument against inclusion of formal DTD criteria into existing diagnostic systems is that emphasis on the etiology of the disorder might force current diagnostic systems to deviate from their purely descriptive nature. Furthermore, comorbidities and biological aspects of the disorder may be underdiagnosed using the DTD criteria. Summary Here, we discuss arguments for and against the proposal of DTD criteria and address implications and consequences for the clinical practice. PMID:23286319

2013-01-01

274

NDMAS System and Process Description  

SciTech Connect

Experimental data generated by the Very High Temperature Reactor Program need to be more available to users in the form of data tables on Web pages that can be downloaded to Excel or in delimited text formats that can be used directly for input to analysis and simulation codes, statistical packages, and graphics software. One solution that can provide current and future researchers with direct access to the data they need, while complying with records management requirements, is the Nuclear Data Management and Analysis System (NDMAS). This report describes the NDMAS system and its components, defines roles and responsibilities, describes the functions the system performs, describes the internal processes the NDMAS team uses to carry out the mission, and describes the hardware and software used to meet Very High Temperature Reactor Program needs.

Larry Hull

2012-10-01

275

Autonomous Control and Diagnostics of Space Reactor Systems  

SciTech Connect

This paper describes three key features of the development of an autonomous control strategy for space reactor systems. These include the development of a reactor simulation model for transient analysis, development of model-predictive control as part of the autonomous control strategy, and a fault detection and isolation module. The latter is interfaced with the control supervisor as part of a hierarchical control system. The approach has been applied to the nodal model of the SP-100 reactor with a thermo-electric generator. The results of application demonstrate the effectiveness of the control approach and its ability to reconfigure the control mode under fault conditions. (authors)

Upadhyaya, B.R.; Xu, X.; Perillo, S.R.P. [The University of Tennessee, Nuclear Engineering Department, Knoxville, TN 37996-2300 (United States); Na, M.G. [Chosun University, Nuclear Engineering Department, Gwangju 501-759 (Korea, Republic of)

2006-07-01

276

Megahertz pulse-burst alexandrite laser diagnostic systems  

NASA Astrophysics Data System (ADS)

Megahertz pulse-burst laser systems coupled with megahertz-rate framing cameras have proven (over the last ten years) to be very robust in imaging of high-speed reacting and nonreacting supersonic flows. These Nd:YAG systems produce 20--30 pulses (at variable rates from 500 kHz to 1 MHz) with 50--100 mJ/pulse (lambda = 1064nm) and have been used with narrow, spectral-linewidth, iodine, atomic filters to image turbulence in supersonic boundary layers with great success (when operating at lambda = 532nm). To extend this pulse-burst capability at other wavelengths (wavelengths outside of the 5--30 GHz tuning range of Nd:YAG: lambda = 1064 nm fundamental, and lambda = 532 nm second harmonic), two unique, tunable, megahertz-rate alexandrite laser systems were designed and built. This dissertation documents these two systems and discusses the potential for tunable, megahertz, pulse-burst systems that have more tuning range than Nd:YAG. These tunable alexandrite systems substantially extend the wavelength range of pulse-burst laser technology, but, to date, have pulse-energy limitations. Tunable from 710 nm to 800 nm (in the fundamental), these lasers provide researchers one laser to reach multiple molecular or atomic resonances with variable pulse-burst pulse separations. The molecular and atomic species of interest in reacting and nonreacting flows are presented in Chapter 1, providing a road-map for the development of these tunable lasers. This dissertation presents the design and development of these systems, including mode control, Herriott cell design for pulse separation, and the megahertz-tuning ringmaster-oscillator. Chapter 2 covers the physics of alexandrite as a solid-state, lamp-pumped, tunable medium and compares it to the tunability of Ti:sapphire. Chapter 3 and 4 present the pulse-burst alexandrite systems. The first system, built in Princeton's Applied Physics group (PAPG) (Chapter 3), produced 1-5 mJ total pulse-packet energy of 20--30 pulses, or approximately 100 muJ per pulse at lambda = 761 nm. The second system, built at Princeton Plasma Physics Labs (PPPL) (Chapter 4), produced pulse-bursts of 3--10 pulses with pulse power of 5--10 mJ/pulse at the fundamental wavelength of 758 nm. The spectral linewidths varied throughout the development of the two systems. Two different master-oscillator configurations were used, one linear, with a standing wave, and one ring, with a unidirectional wave. Using a linear, master-oscillator with double inter-cavity Fabry-Perot etalons, the PPPL pulse-burst system achieved 0.3A linewidth and limited tuning capability (limited by the tuning resolution of the inter-cavity, 9-plate, birefringent tuner). This made the system appropriate for laser induced fluorescence (LIF) studies of plasma turbulence, but, not sufficient for filtered Rayleigh scattering. The linear oscillator for the PAPG system achieved linewidths on the order of 1A (by way of a 4-plate, birefringent tuner). PAPG's system was designed with a Sacher diode-seeding system to decrease the linewidth to under 1 GHz (i.e., 0.002A) by way of cavity seeding, however, the linear oscillator did not reliably mode-lock. To achieve mode-locked, mode-hop-free tuning on the order of 30 GHz with a 88 MHz linewidth pulse, the master oscillator was configured and built as a mode-locked, diode-injection-seeded, alexandrite ring-cavity with "rapid-ramp" cavity length stabilization (RCLS) technology. Chapter 5 and Chapter 6 present the design and performance of the unidirectional-wave, alexandrite ring laser. The mode-locked, alexandrite, ring laser's piezo modulation system and driver are presented in this thesis, along with experimental results which focus on spectral linewidth and spectral-purity characterization, using an atomic potassium filter at lambda = 766.701 nm and atomic rubidium filter at lambda = 780.2445 nm (vacuum wavelengths) for the alexandrite ring in single-pulse mode. These atomic, vapor-cell, experimental-scan results document the reliability and tunability of the ring as a master oscillator for the

Luff, Jon David

277

Implementing Software On-line Diagnostics in Safety Critical Systems  

Microsoft Academic Search

Current design and assessment methods cannot ensure that software is error free and consequently fault tolerant techniques pla y an important role in safety critical systems to ensure reliable software behavi our. Unfortunately general guidelines for the implementation of software diagn ostics are lacking. The aim of this work is to build on the previous resear ch in software error

John Napier; Gordon Hughes; John May

1999-01-01

278

Failure diagnostics for railway point machines using expert systems  

Microsoft Academic Search

Maintenance is an inevitable reality in industry. Maintenance of a system usually involves maintenance of multiple components with multiple failure modes, each of which may require different maintenance policy (i.e., corrective (CM), preventive (PM), or condition based maintenance (CBM)). A maintenance policy may be best for one component and the worst for the other (CM may be best for a

V. Atamuradov; F. Camci; S. Baskan; M. Sevkli

2009-01-01

279

Development of a system to provide diagnostics-while-drilling.  

SciTech Connect

This report describes development of a system that provides high-speed, real-time downhole data while drilling. Background of the project, its benefits, major technical challenges, test planning, and test results are covered by relatively brief descriptions in the body of the report, with some topics presented in more detail in the attached appendices.

Wise, Jack LeRoy; Jacobson, Ronald David; Finger, John Travis; Mansure, Arthur James; Knudsen, Steven Dell

2003-06-01

280

Transformation of personal computers and mobile phones into genetic diagnostic systems.  

PubMed

Molecular diagnostics based on the polymerase chain reaction (PCR) offer rapid and sensitive means for detecting infectious disease, but prohibitive costs have impeded their use in resource-limited settings where such diseases are endemic. In this work, we report an innovative method for transforming a desktop computer and a mobile camera phone--devices that have become readily accessible in developing countries--into a highly sensitive DNA detection system. This transformation was achieved by converting a desktop computer into a de facto thermal cycler with software that controls the temperature of the central processing unit (CPU), allowing for highly efficient PCR. Next, we reconfigured the mobile phone into a fluorescence imager by adding a low-cost filter, which enabled us to quantitatively measure the resulting PCR amplicons. Our system is highly sensitive, achieving quantitative detection of as little as 9.6 attograms of target DNA, and we show that its performance is comparable to advanced laboratory instruments at approximately 1/500th of the cost. Finally, in order to demonstrate clinical utility, we have used our platform for the successful detection of genomic DNA from the parasite that causes Chagas disease, Trypanosoma cruzi, directly in whole, unprocessed human blood at concentrations 4-fold below the clinical titer of the parasite. PMID:25223929

Walker, Faye M; Ahmad, Kareem M; Eisenstein, Michael; Soh, H Tom

2014-09-16

281

Transformation of Personal Computers and Mobile Phones into Genetic Diagnostic Systems  

PubMed Central

Molecular diagnostics based on the polymerase chain reaction (PCR) offer rapid and sensitive means for detecting infectious disease, but prohibitive costs have impeded their use in resource-limited settings where such diseases are endemic. In this work, we report an innovative method for transforming a desktop computer and a mobile camera phone—devices that have become readily accessible in developing countries—into a highly sensitive DNA detection system. This transformation was achieved by converting a desktop computer into a de facto thermal cycler with software that controls the temperature of the central processing unit (CPU), allowing for highly efficient PCR. Next, we reconfigured the mobile phone into a fluorescence imager by adding a low-cost filter, which enabled us to quantitatively measure the resulting PCR amplicons. Our system is highly sensitive, achieving quantitative detection of as little as 9.6 attograms of target DNA, and we show that its performance is comparable to advanced laboratory instruments at approximately 1/500th of the cost. Finally, in order to demonstrate clinical utility, we have used our platform for the successful detection of genomic DNA from the parasite that causes Chagas disease, Trypanosoma cruzi, directly in whole, unprocessed human blood at concentrations 4-fold below the clinical titer of the parasite. PMID:25223929

2014-01-01

282

Analysis of data obtained in clinical trials of optical biopsy system for breast cancer diagnostics  

NASA Astrophysics Data System (ADS)

In the clinical trials it was shown, that characteristics of optical scattering and absorption are sensitive to the tissue type and state. In the given report improved optical biopsy system will be presented, clinical trials of which have been conducted in the Regional Oncology Center of Nizhny Novgorod, Russia. During a year more than 160 patients with breast tumors were investigated using this system. Radiation from a xenon lamp through an optical fiber placed inside the probe's needle was delivered into the breast. The radiation scattered from the breast tissue was collected by another fibers also placed in the same needle and its spectrum was measured. Obtained optical data was analyzed to find general optical characteristics of scattered radiation in different types of tissue and revealing the major peculiarities in the spectral scattering coefficients of malignant tumors and their distinctions from benign tumors and healthy tissue. Using different mathematical algorithm the typical template of scattering spectrum was found for benign and malignant type of breast tumor. Then the algorithm of automatic detection of malignant spectra in the data flow was developed. Using this algorithm the datasets of all patients were processed and analyzed and the diagnoses were obtained. The automatic diagnoses were compared with those given by physicians. As a result the indexes of sensitivity and specificity for the optical biopsy diagnostic method were found equal to 96% and 80% correspondingly.

Belkov, S. A.; Kochemasov, G. G.; Kulikov, S. M.; Maslov, N. V.; Bondarenko, S. V.; Shakhova, N. M.; Pavlycheva, I. Y.; Rubenchik, A.; Da Silva, L. B.

2008-02-01

283

Sucker rod pumping unit diagnostics using an expert system: and pattern recognition technique  

E-print Network

, The objective of this study is to apply expert system technology in the diagnostics of sucker rod pumping units. This approach helps to capture expert' s knowledge , often held by a few individuals, and make it available in the field wherever a personal... computer is available. The captured knowledge becomes permanently recorded and can be updated as the system solves more difficult problems. A rule-based expert system has been developed to help the user analyze the subsurface pump problems. Based...

Derek, Henryk Jozef

2012-06-07

284

Heart involvement in systemic sclerosis: evolving concept and diagnostic methodologies.  

PubMed

Heart involvement, including primary myocardial involvement, is very common in systemic sclerosis. There is strong evidence that primary myocardial involvement is related to repeat focal ischaemic injury causing subsequent irreversible myocardial fibrosis. Clinically evident cardiac involvement is recognized to be a poor prognostic factor; thus preclinical identification is highly encouraged. The severity of heart involvement has been confirmed recently. Echocardiography, including pulsed tissue Doppler echocardiography, is the cornerstone of routine heart assessment. Myocardial perfusion may be assessed by single photon emission computed tomography. If available, cardiac magnetic resonance imaging should be considered as it allows simultaneous measurement of ventricular volumes and function and myocardial perfusion, and assessment of possible inflammation and/or fibrosis. Biological variables, such as B-type natriuretic peptides, are highly relevant, valuable markers of global heart involvement in systemic sclerosis and should be considered for screening of patients and/or research purposes. PMID:20142120

Meune, Christophe; Vignaux, Olivier; Kahan, André; Allanore, Yannick

2010-01-01

285

Application of Diagnostic Analysis Tools to the Ares I Thrust Vector Control System  

NASA Technical Reports Server (NTRS)

The NASA Ares I Crew Launch Vehicle is being designed to support missions to the International Space Station (ISS), to the Moon, and beyond. The Ares I is undergoing design and development utilizing commercial-off-the-shelf tools and hardware when applicable, along with cutting edge launch technologies and state-of-the-art design and development. In support of the vehicle s design and development, the Ares Functional Fault Analysis group was tasked to develop an Ares Vehicle Diagnostic Model (AVDM) and to demonstrate the capability of that model to support failure-related analyses and design integration. One important component of the AVDM is the Upper Stage (US) Thrust Vector Control (TVC) diagnostic model-a representation of the failure space of the US TVC subsystem. This paper first presents an overview of the AVDM, its development approach, and the software used to implement the model and conduct diagnostic analysis. It then uses the US TVC diagnostic model to illustrate details of the development, implementation, analysis, and verification processes. Finally, the paper describes how the AVDM model can impact both design and ground operations, and how some of these impacts are being realized during discussions of US TVC diagnostic analyses with US TVC designers.

Maul, William A.; Melcher, Kevin J.; Chicatelli, Amy K.; Johnson, Stephen B.

2010-01-01

286

A Model-Based Expert System for Space Power Distribution Diagnostics  

NASA Technical Reports Server (NTRS)

When engineers diagnose system failures, they often use models to confirm system operation. This concept has produced a class of advanced expert systems that perform model-based diagnosis. A model-based diagnostic expert system for the Space Station Freedom electrical power distribution test bed is currently being developed at the NASA Lewis Research Center. The objective of this expert system is to autonomously detect and isolate electrical fault conditions. Marple, a software package developed at TRW, provides a model-based environment utilizing constraint suspension. Originally, constraint suspension techniques were developed for digital systems. However, Marple provides the mechanisms for applying this approach to analog systems such as the test bed, as well. The expert system was developed using Marple and Lucid Common Lisp running on a Sun Sparc-2 workstation. The Marple modeling environment has proved to be a useful tool for investigating the various aspects of model-based diagnostics. This report describes work completed to date and lessons learned while employing model-based diagnostics using constraint suspension within an analog system.

Quinn, Todd M.; Schlegelmilch, Richard F.

1994-01-01

287

In situ process diagnostics of silane plasma for device-quality a-Si:H deposition  

NASA Astrophysics Data System (ADS)

Coherent anti-Stokes Raman spectroscopy (CARS) and mass spectrometry (MS) have been applied to in situ process diagnostics of a silane plasma for device-quality a-Si:H film deposition. Silane depletion was directly measured by CARS and is linearly dependent on RF power in the region of 4-12 W with a slope of 0.5 percent/mW-sq cm. The depletion is also dependent on SiH4 flow rate starting with a 50 percent depletion at a low flow rate of 5.6 sccm and asymptotically approaching an 8 percent depletion at a flow rate of 80 sccm. The mass spectral line signal intensity of disilane increases with RF power and shows an apparent transition at 6 W. Disilane formation in silane plasma, film deposition rate, and silane depletion ratio as a function of the RF power indicate that the film growth mechanism in the low-power region of 3.5-6.5 W is substantially different from that in the high-power region of 6.5-12 W.

Shing, Y. H.; Perry, J. W.; Hermann, A. M.

288

The Relationship Between Performance on the Gordon Diagnostic System and Other Measures of Attention  

Microsoft Academic Search

Tests purporting to measure attention were administered to college students to examine their relationship to three relatively new tests of attention from the Gordon Diagnostic System (GDS). All subjects received the Standard Delay, Vigilance, and Distractibility Tests of the GDS. In addition, 69 of 136 subjects received the Digit Span, Arithmetic, and Digit Symbol subtests of the Wechsler Adult Intelligence

Deborah A. Rasile; Joanna S. Burg; Richard G. Bumght; Peter J. Donovick

1995-01-01

289

Gallium arsenide integrated optical devices for high-speed diagnostic systems  

SciTech Connect

The design, fabrication, and evaluation of waveguide electro-optic modulators in gallium arsenide for application to high-speed diagnostic systems are discussed specifically. This paper is focused on high bandwidth, single event analog modulation, and radiation susceptibility of these devices.

McWright, G.; Lowry, M.; Takeuchi, E.; Murphy, G.; Tindall, W.; Koo, J.; Roeske, F.

1987-01-01

290

Computer-aided diagnostic detection system of venous beading in retinal images  

E-print Network

for publication Dec. 9, 1999. 1 Introduction Retinal or fundus images provide information about the blood supply and microaneurysms, where the retinal images are acquired digitally or digitized by scanning slice films into digitalComputer-aided diagnostic detection system of venous beading in retinal images Ching-Wen Yang

Chang, Chein-I

291

Concurrent and Discriminant Validity of the Gordon Diagnostic System: A Preliminary Study.  

ERIC Educational Resources Information Center

Investigated discriminant and concurrent validity of Gordon Diagnostic System (GDS) in 29 boys categorized into "normals" or "attention deficit hyperactivity disordered" (ADHD) based on teacher ratings. Results failed to demonstrate discriminant validity of any GDS score regardless of behavior rating used. Vigilance Correct and Vigilance Omission…

Wherry, Jeffrey N.; And Others

1993-01-01

292

Beam diagnostic systems and their use in the new IUCF beam line  

Microsoft Academic Search

Diagnostic tools developed for and being used in a new 30 m beam line (BL1C) connecting the IUCF high intensity polarized ion source (HIPIOS) with the injector cyclotron are described and the results obtained with them are detailed. These devices include non-intercepting beam position monitors, wire scanners, and beam sweeper systems. Studies of rf beam bunching have been performed using

W. P. Jones; M. Ball; J. Collins; T. Ellison

1995-01-01

293

Three Diagnostic Systems for Autism: DSM-III, DSM-III-R, and ICD-10.  

ERIC Educational Resources Information Center

This paper compared clinicians' diagnosis and DSM-III (Diagnostic and Statistical Manual), DSM-III-R (Revised), and ICD-10 (International Classification of Diseases) diagnoses of 52 individuals with autism and 62 nonautistic, developmentally disordered individuals. The DSM-III-R system overdiagnosed the presence of autism, and ICD-10 closely…

Volkmar, Fred R.; And Others

1992-01-01

294

RADAR SYSTEMS FOR INFRASTRUCTURES DIAGNOSTICS: A REVIEW Ilaria Catapano, Antonio Affinito, Lorenzo Crocco, Francesco Soldovieri  

E-print Network

engineering monitoring and diagnostics. In fact, Ground Penetrating Radar and Holographic Radar are well capabilities. KEYWORDS: Ground Penetrating Radar, Holographic Radar, Microwave Imaging, Subsurface imaging - National Research Council of Italy (IREA-CNR). First of all, Ground Penetrating Radar (GPR) systems

Paris-Sud XI, Université de

295

A portable hardware-in-the-loop (HIL) device for automotive diagnostic control systems.  

PubMed

In-vehicle driving tests for evaluating the performance and diagnostic functionalities of engine control systems are often time consuming, expensive, and not reproducible. Using a hardware-in-the-loop (HIL) simulation approach, new control strategies and diagnostic functions on a controller area network (CAN) line can be easily tested in real time, in order to reduce the effort and the cost of the testing phase. Nowadays, spark ignition engines are controlled by an electronic control unit (ECU) with a large number of embedded sensors and actuators. In order to meet the rising demand of lower emissions and fuel consumption, an increasing number of control functions are added into such a unit. This work aims at presenting a portable electronic environment system, suited for HIL simulations, in order to test the engine control software and the diagnostic functionality on a CAN line, respectively, through non-regression and diagnostic tests. The performances of the proposed electronic device, called a micro hardware-in-the-loop system, are presented through the testing of the engine management system software of a 1.6 l Fiat gasoline engine with variable valve actuation for the ECU development version. PMID:22075387

Palladino, A; Fiengo, G; Lanzo, D

2012-01-01

296

Systemic Diagnostic Testing in Patients With Apparently Isolated Uveal Coloboma  

PubMed Central

PURPOSE To investigate the frequency and types of systemic findings in patients with apparently isolated uveal coloboma. DESIGN Cross-sectional observational study. METHODS SETTING Single-center ophthalmic genetics clinic. STUDY POPULATION Ninety-nine patients with uveal coloboma seen at the National Eye Institute. OBSERVATIONAL PROCEDURE Results of audiology testing, echocardiogram, brain magnetic resonance imaging, renal ultrasound, and total spine radiographs. MAIN OUTCOME MEASURE Prevalence of abnormal findings on systemic testing. RESULTS Uveal coloboma affected only the anterior segment in 8 patients, only the posterior segment in 23 patients, and both anterior and posterior segments in 68 patients. Best-corrected visual acuity (BCVA) of eyes with coloboma was ?20/40 in 45% of eyes; 23% of eyes had BCVA of ?20/400. The majority of patients (74%) had good vision (>20/60) in at least 1 eye. Ten of the 19 patients (53%) who underwent echocardiography had abnormalities, with ventral septal defects being the most prevalent. Abnormal findings were observed in 5 of 72 patients (7%) who had a renal ultrasound and in 5 of 29 patients (17%) who underwent a brain MRI. Audiology testing revealed abnormalities in 13 of 75 patients (17%), and spine radiographs showed anomalies in 10 of 77 patients (13%). Most findings required no acute intervention. CONCLUSIONS Although some patients with coloboma had evidence of extraocular abnormalities, the majority of findings on routine clinical examination did not require acute intervention, but some warranted follow-up. Results from the systemic evaluation of patients with coloboma should be interpreted with caution and in view of their clinical context. PMID:24012100

HUYNH, NANCY; BLAIN, DELPHINE; GLASER, TANYA; DOSS, E. LAUREN; ZEIN, WADIH M.; LANG, DAVID M.; BAKER, EVA H.; HILL, SUVIMOL; BREWER, CARMEN C.; KOPP, JEFFREY B.; BARDAKJIAN, TANYA M.; MAUMENEE, IRENE H.; BATEMAN, BRONWYN J.; BROOKS, BRIAN P.

2014-01-01

297

Diagnostic and Protection Systems for the Daresbury SRS Upgrade  

E-print Network

. The UK light source, the SRS, is being upgraded by the addition of two multipole wiggler magnets. The reduced aperture of +/--7.5 mm within the titanium alloy tube has provided the opportunity to incorporate new sensitive electron beam position monitors. Due to investigations into the effects of synchrotron radiation striking uncooled surfaces, software and hardware vessel protection systems have also been incorporated for machine protection. INTRODUCTION The 2.0 GeV second generation Synchrotron Storage Ring at Daresbury, the UK's only synchrotron radiation light source, is now a mature machine. It provides facilities for over 2500 users from both academic and commercial backgrounds. The primary source of radiation is the 16 dipole magnets. In order to provide significant improvements, insertion devices have been added. Currently two superconducting wavelength shifters and one undulator have been completed and are now fully exploited. As a continuing policy to develop and impr...

unknown authors

298

A Diagnostic Neutral Beam System for the MST Reversed-Field Pinch: CHERS and Rutherford Scattering  

NASA Astrophysics Data System (ADS)

Two high intensity diagnostic neutral beams are being fabricated by the Institute of Nuclear Physics (Novosibirsk, Russia) for the MST Reversed-Field Pinch. These beams will be used for Charge-Exchange Recombination Spectroscopy (CHERS) and a Rutherford scattering diagnostic to measure impurity and majority ion velocity and temperature, both equilibrium and fluctuating. The CHERS diagnostic is an extension of an existing MST spectroscopic diagnostic which has successfully measured chord-averaged flow with 10 ?s time resolution. With a 30keV/4A Hydrogen beam, CHERS will provide high spatial and temporal resolution, critically needed for the investigation of fluctuations associated with the dynamo and transport. A distinguishing feature of the Rutherford diagnostic is that it will be applied for local measurements of majority ion fluctuating velocity and temperature. In order to achieve a time resolution of about 10 ?s we will employ a high current 20keV/4A Helium beam. The overall system characteristics and the status of the project will be presented.

Fiksel, G.; den Hartog, D. J.; Davydenko, V. I.; Ivanov, A. A.

1998-11-01

299

Automatic process plan generation in an operative process planning system  

Microsoft Academic Search

The architecture and design of process planning systems should follow the architecture and design of the manufacturing systems they are intended to serve. This article describes a process planning system specifically intended for a workshop orientated factory, a factory which is specialized for the production of a limited number of group technological product lines. The goal of the system is

J. OPAS; F. KANERVA; M. MANTYLA

1994-01-01

300

Measurement and simulation of stilbene scintillator response for the KSTAR neutron diagnostic system  

NASA Astrophysics Data System (ADS)

The Korea Superconducting Tokamak Advanced Research (KSTAR) project was started in December 1995, and its construction was completed in August 2007. On June 13, 2008, the KSTAR successfully produced its first plasma, and the diagnostic systems played an important role in achieving the first successful plasma operation. In fact, various diagnostic systems are required to protect reactor devices, to the control plasma, and to evaluate the plasma's performance in fusion reactors. One of the most essential tools for control of the burning plasma in fusion reactors may be a neutron diagnostic system to prove the presence of the plasma by measuring the neutrons from fusion reactions directly. The stilbene scintillator has been proposed as a good candidate for a neutron diagnostic system in the KSTAR fusion reactor because the stilbene scintillator is well-known to be an excellent material for detection of fast neutrons in a high gamma-ray background environment. If fast-neutron spectra are to be measured amid a high gamma-ray background, especially-designed electronics are necessary. For instance, a digital charge pulse shape discrimination (PSD) method, utilizing a total-to-partial-charge-ratio analysis, discriminates neutron from gamma-ray signals. Also, a flash analog-to-digital convertor (FADC) with a field-programmable gate array (FPGA) increases the data-transfer rate for real-time evaluation of plasma performance. In the present study, measurements and simulations were performed in order to confirm the stilbene scintillator's response to D-D fusion reaction neutrons. Additionally, the count-rate limit of the neutron diagnostic system was determined by using measurements with a 252Cf source at different distances.

Lee, Seung Kyu; Son, Jae Bum; Kang, JeongSoo; Seo, Hee; Won, Byung-Hee; Park, Se-Hwan; Kim, Ho-Dong; Kang, Byoung Hwi; Kim, Gi Dong; Kim, Yong Kyun

2014-03-01

301

X-ray and EUV micro-imaging systems for laser ICF diagnostics  

NASA Astrophysics Data System (ADS)

Plasma imaging diagnostics plays an important role for laser ICF. Based on the urgent need to carry out high-resolution, high-throughput plasma diagnostics, grazing-incidence X-ray Kirkpatrick-Baez (KB) microscopes and normal-incidence EUV Schwarzschild imaging system were developed. The X-ray multilayer KB microscopes were successfully been applied in the physics experiments of SGII laser facility. Combined with streaked camera, the Mo-backlit implosion flow line of hollow Carbon-Hydrogen (CH) spherical target was obtained in SGII. The 4.75keV single-channel and four-channel KB microscopes were also developed for self-emission and short-pulse backlit imaging diagnostic of CH cylindrical target. In addition, according to the need of ultra-short laser pulse plasma diagnostics, the Schwarzschild imaging system working at 68eV was researched, and the physical experiments of hot electron transport with Schwarzschild imaging system were performed in SILEX-I laser facility.

Yi, S.; Mu, B.; Wang, X.; Huang, W.; Li, J.; Wang, Z.

2013-10-01

302

Intermediate frequency band digitized high dynamic range radiometer system for plasma diagnostics and real-time Tokamak control  

SciTech Connect

An intermediate frequency (IF) band digitizing radiometer system in the 100-200 GHz frequency range has been developed for Tokamak diagnostics and control, and other fields of research which require a high flexibility in frequency resolution combined with a large bandwidth and the retrieval of the full wave information of the mm-wave signals under investigation. The system is based on directly digitizing the IF band after down conversion. The enabling technology consists of a fast multi-giga sample analog to digital converter that has recently become available. Field programmable gate arrays (FPGA) are implemented to accomplish versatile real-time data analysis. A prototype system has been developed and tested and its performance has been compared with conventional electron cyclotron emission (ECE) spectrometer systems. On the TEXTOR Tokamak a proof of principle shows that ECE, together with high power injected and scattered radiation, becomes amenable to measurement by this device. In particular, its capability to measure the phase of coherent signals in the spectrum offers important advantages in diagnostics and control. One case developed in detail employs the FPGA in real-time fast Fourier transform (FFT) and additional signal processing. The major benefit of such a FFT-based system is the real-time trade-off that can be made between frequency and time resolution. For ECE diagnostics this corresponds to a flexible spatial resolution in the plasma, with potential application in smart sensing of plasma instabilities such as the neoclassical tearing mode (NTM) and sawtooth instabilities. The flexible resolution would allow for the measurement of the full mode content of plasma instabilities contained within the system bandwidth.

Bongers, W. A.; Beveren, V. van; Westerhof, E.; Goede, A. P. H.; Krijger, B.; Berg, M. A. van den; Graswinckel, M. F.; Schueller, F. C. [FOM-Institute for Plasma Physics Rijnhuizen, Association EURATOM-FOM, Trilateral Euregio Cluster, PO Box 1207, 3430 BE Nieuwegein (Netherlands); Thoen, D. J. [Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft (Netherlands); Nuij, P. J. W. M. [Eindhoven University of Technology, Control Systems Technology Group, and Applied Physics Department, PO Box 513, NL-5600 MB Eindhoven (Netherlands); Baar, M. R. de; Donne, A. J. H.; Hennen, B. A. [FOM-Institute for Plasma Physics Rijnhuizen, Association EURATOM-FOM, Trilateral Euregio Cluster, PO Box 1207, 3430 BE Nieuwegein (Netherlands); Eindhoven University of Technology, Control Systems Technology Group, and Applied Physics Department, PO Box 513, NL-5600 MB Eindhoven (Netherlands); Kantor, M. [FOM-Institute for Plasma Physics Rijnhuizen, Association EURATOM-FOM, Trilateral Euregio Cluster, PO Box 1207, 3430 BE Nieuwegein (Netherlands); Forschungszentrum Juelich GMBH, Institute of Energy and Climate research, Plasma Physics, Association EURATOM-FZJ, Trilateral Euregio Cluster, 52425 Juelich (Germany); Ioffe Institute, RAS, Saint-Petersburg, 195256 (Russian Federation)

2011-06-15

303

An Approach for Self-repair in Distributed System Using Immunity-Based Diagnostic Mobile Agents  

Microsoft Academic Search

\\u000a In recent years, self-repair has attracted much attention again for fault tolerance in distributed computer network system.\\u000a In our previous research, abnormal units (host computers and mobile agents) in distributed system can be identified by the\\u000a immunity-based diagnostic model. The model calculates the credibility of each unit. In this paper, based on the credibility,\\u000a some units try to self-repair, that

Yuji Watanabe; Shigeyuki Sato; Yoshiteru Ishida

2004-01-01

304

A microcomputer-based diagnostic system for identifying students' conceptions of heat and temperature  

NSDL National Science Digital Library

This paper presents a microcomputer-based diagnostic system (MBDS), designed for identifying students' conceptions in the domain of heat and temperature. The MBDS consists of three major parts: the input unit, the rule-base and the students' knowledge profile. These parts are described and illustrated. In addition, the four phases of developing the MBDS--the preliminary empirical study, the construction of the rule-base, the production of the system, and its evaluation--are briefly described.

Nachimias, R.; Stavy, R.; Avrams, R.

2006-06-09

305

A Study of Laser System Requirements for Application in Beam Diagnostics And Polarimetry at the ILC  

SciTech Connect

Advanced laser systems will be essential for a range of diagnostics devices and polarimetry at the ILC. High average power, high beam quality, excellent stability and reliability will be crucial in order to deliver the information required to attain the necessary ILC luminosity as well as for efficient polarimetry. The key parameters are listed together with the R & D required to achieve the necessary laser system performance.

Dixit, S.; Delerue, N.; Foster, B.; Howell, D.F.; Peach, K.; Quelch, G.; Qureshi, M.; Reichold, A.; /Oxford U.; Hirst, G.; Ross, I.; /Rutherford; Urakawa, J.; /KEK,; Soskov, V.; Variola, A.; Zomer, F.; /Orsay, LAL; Blair, G.A.; Boogert, S.T.; Boorman, G.; Bosco, A.; Driouichi, C.; Karataev, P.; /Royal Holloway, U. of London; Brachmann,; /SLAC

2007-02-12

306

Survey of diagnostic systems for the study of gyrocenter shifts on National Spherical Torus Experiment  

SciTech Connect

The formation of the radial electric field at the boundary of high temperature plasmas can be induced by the radial 'gyrocenter shift' during the charge exchange process with neutrals. The model of the gyrocenter shift to be discussed here is different from the conventional gyrocenter drift. Specifically, in this model, the induced electric field is a strong function of neutral density and its gradient in addition to the conventional ExB and diamagnetic terms. The preliminary calculation of the gyrocenter shift of the H-mode plasma on the National Spherical Torus Experiment (NSTX) demonstrates the sensitive dependence of the radial electric field on the neutral density profile. An assessment of diagnostics on NSTX is carried out for the measurement of neutral density. The required spatial and time resolutions for the measurements are 2 mm and a few kilohertz, respectively. In this article, the predicted profile of the edge electric field on NSTX based on the gyrocenter shift model is discussed in conjunction with the in and out asymmetry of diverter D-alpha camera data and the measurement of the edge electron density by the far infrared tangential interferometer/polarimeter system.

Lee, K. C.; Domier, C. W.; Johnson, M.; Luhmann, N. C. Jr.; Park, H.; Soukhanovskii, V. A. [University of California at Davis, Davis, California 95616 (United States); Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

2006-10-15

307

First Results with the Diagnostic Neutral Beam System for the MST Reversed-Field Pinch  

NASA Astrophysics Data System (ADS)

A diagnostic neutral beam system has been created for the MST Reversed-Field Pinch. The system consists of two beam units, and two neutral particle analyzers. One unit creates 20 keV, 4 A helium beam and, along with the analyzers, will be used for the Rutherfod scattering diagnostic to measure the majority ion equilibrium and fluctuating velocity and temperature. The ion temperature and velocity are deduced from the broadening and the shift of the energy spectra of the beam atoms scattered off the plasma ions. A second beam unit creates a 30 keV, 4 A hydrogen beam, which will be used for Charge-Exchange Recombination Spectroscopy (CHERS) and magnetic field measurement via Motion Stark Effect (MSE). The CHERS diagnostic is an extension of an existing MST spectroscopic diagnostic which has successfully measured chord-averaged flow with 10 =B5s time resolution. The CHERS will provide high spatial resolution, critically needed for the investigation of fluctuations associated with the dynamo and transport. We will report measurements of the beam properties and first results of the beam application on the MST.

Fiksel, G.; Craig, D.; den Hartog, D. J.; Reardon, J. C.; Abdrashitov, A. F.; Davydenko, V. I.; Ivanov, A. A.; Korepanov, S. A.; Murachtin, S. V.; Shulzhenko, G. I.

1999-11-01

308

Straining and wrinkling processes during turbulence-premixed flame interaction measured using temporally-resolved diagnostics  

SciTech Connect

The dynamical processes of flame surface straining and wrinkling that occur as turbulence interacts with a premixed flame were measured using cinema-stereoscopic PIV (CS-PIV) and orthogonal-plane cinema-stereoscopic PIV (OPCS-PIV). These diagnostics provided temporally resolved measurements of turbulence-flame interaction at frame rates of up to 3 kHz and spatial resolutions as small as 280{mu} m. Previous descriptions of flame straining and wrinkling have typically been derived based on a canonical interaction between a pair of counter-rotating vortices and a planar flame surface. However, it was found that this configuration did not properly represent real turbulence-flame interaction. Interactions resembling the canonical configuration were observed in less than 10% of the recorded frames. Instead, straining and wrinkling were generally caused more geometrically complex turbulence, consisting of large groups of structures that could be multiply curved and intertwined. The effect of the interaction was highly dependent on the interaction geometry. Furthermore, even when the turbulence did exist in the canonical geometry, the straining and wrinkling of the flame surface were not well characterized by the vortical structures. A new mechanistic description of the turbulence-flame interaction was therefore identified and confirmed by the measurements. In this description, flame surface straining is caused by coherent structures of fluid-dynamic strain-rate (strain-rate structures). The role of vortical structures is to curve existing flame surface, creating wrinkles. By simultaneously considering both forms of turbulent structure, turbulence-flame interactions in both the canonical configuration and more complex geometries could be understood. (author)

Steinberg, Adam M.; Driscoll, James F. [Department of Aerospace Engineering, The University of Michigan, Ann Arbor, MI 48109 (United States)

2009-12-15

309

Improving diagnostic accuracy using agent-based distributed data mining system.  

PubMed

The use of data mining techniques to improve the diagnostic system accuracy is investigated in this paper. The data mining algorithms aim to discover patterns and extract useful knowledge from facts recorded in databases. Generally, the expert systems are constructed for automating diagnostic procedures. The learning component uses the data mining algorithms to extract the expert system rules from the database automatically. Learning algorithms can assist the clinicians in extracting knowledge automatically. As the number and variety of data sources is dramatically increasing, another way to acquire knowledge from databases is to apply various data mining algorithms that extract knowledge from data. As data sets are inherently distributed, the distributed system uses agents to transport the trained classifiers and uses meta learning to combine the knowledge. Commonsense reasoning is also used in association with distributed data mining to obtain better results. Combining human expert knowledge and data mining knowledge improves the performance of the diagnostic system. This work suggests a framework of combining the human knowledge and knowledge gained by better data mining algorithms on a renal and gallstone data set. PMID:22958198

Sridhar, S

2013-09-01

310

DEVELOPMENT OF PROTOTYPE PROCESS SYSTEMS FOR OMR  

Microsoft Academic Search

Three pilot plant process systems were operated to provide engineering ; data for the design of Advanced Organic Moderated Reactor (AOMR) processing ; systems. The performance of purification, degasification, and waste gas and ; water treatment systems was studied and compared with expected performance. The ; systems were previously constructed and evaluated as part of the Piqua OMR ; process

W. N. Bley; J. A. Vanderlip; R. R. Stiens

1962-01-01

311

Studying the Impact of Spaceflight Environment on Immune Functions Using New Molecular Diagnostics System  

NASA Astrophysics Data System (ADS)

Immune functions are altered during space flights. Latent virus reactivation, reduction in the number of immune cells, decreased cell activation and increased sensitivity of astronauts to infections following their return on Earth demonstrate that the immune system is less efficient during space flight. The causes of this immune deficiency are not fully understood and this dysfunction during long-term missions could result in the appearance of opportunistic infections or a decrease in the immuno-surveillance mechanisms that eradicate cancer cells. Therefore, the immune functions of astronauts will have to be monitored continuously during long-term missions in space, using miniature and semi-automated diagnostic systems. The objectives of this project are to study the causes of space-related immunodeficiency, to develop countermeasures to maintain an optimal immune function and to improve our capacity to detect infectious diseases during space missions through the monitoring of astronauts' immune system. In order to achieve these objectives, an Immune Function Diagnostic System (IFDS) will be designed to perform a set of immunological assays on board spacecrafts or on planet-bound bases. Through flow cytometric assays and molecular biology analyses, this diagnostic system could improve medical surveillance of astronauts and could be used to test countermeasures aimed at preventing immune deficiency during space missions. The capacity of the instrument to assess cellular fluorescence and to quantify the presence of soluble molecules in biological samples would support advanced molecular studies in space life sciences. Finally, such diagnostic system could also be used on Earth in remote areas or in mobile hospitals following natural disasters to fight against infectious diseases and other pathologies.

Cohen, Luchino

312

The video fluorescent device for diagnostics of cancer of human reproductive system  

NASA Astrophysics Data System (ADS)

Photodynamic therapy (PDT) is one of the advanced methods of treatment of skin cancer and surfaces of internal organs. The basic advantages of PDT are high efficiency and low cost of treatment. PDT technique is needed for providing fluorescent diagnostics. Laser-based systems are widely applied to the fluorescence excitations for diagnostic because of a narrow spectrum of fluorescence excitation and high density of radiation. Application of laser systems for carrying out fluorescent diagnostics gives the image of a tumor distorted by speckles that does not give an opportunity to obtain full information about the form of a tumor quickly. Besides, these laser excitation systems have complicated structure and high cost. As a base for the development and creation of a video fluorescent device one of commercially produced colposcopes was chosen. It allows to decrease cost of the device, and also has enabled to make modernization for already used colposcopes. A LED-based light source was offered to be used for fluorescence excitation in this work. The maximum in a spectrum of radiation of LEDs corresponds to the general spectral maximum of protoporphyrin IX (PPIX) absorption. Irradiance in the center of a light spot is 31 mW/cm2. The receiving optical system of the fluorescent channel is adjusted at 635 nm where a general spectral maximum of fluorescence PPIX is located. Also the device contains a RGB video channel, a white light source and a USB spectrometer LESA-01-BIOSPEC, for measurement of spectra of fluorescence and diffusion reflections in treatment area. The software is developed for maintenance of the device. Some studies on laboratory animals were made. As a result, areas with the increased concentration of a PPIX were correctly detected. At present, the device is used for diagnostics of cancer of female reproductive system in Research Centre for Obstetrics, Gynecology and Perinatology of the Russian Academy of Medical Sciences (Moscow, Russia).

Brysin, Nickolay N.; Linkov, Kirill G.; Stratonnikov, Alexander A.; Savelieva, Tatiana A.; Loschenov, Victor B.

2008-06-01

313

Note: An advanced in situ diagnostic system for characterization of electric propulsion thrusters and ion beam sources.  

PubMed

We present an advanced diagnostic system for in situ characterization of electric propulsion thrusters and ion beam sources. The system uses a high-precision five-axis positioning system with a modular setup and the following diagnostic tools: a telemicroscopy head for optical imaging, a triangular laser head for surface profile scanning, a pyrometer for temperature scanning, a Faraday probe for current density mapping, and an energy-selective mass spectrometer for beam characterization (energy and mass distribution, composition). The capabilities of our diagnostic system are demonstrated with a Hall effect thruster SPT-100D EM1. PMID:20441379

Bundesmann, C; Tartz, M; Scholze, F; Leiter, H J; Scortecci, F; Gnizdor, R Y; Neumann, H

2010-04-01

314

A diagnostic system for electrical faults in a high current discharge plasma setup.  

PubMed

A diagnostic system to detect electrical faults inside a coaxial high current discharge device is presented here. This technique utilizes two biconical antennas picking up electromagnetic radiation from the discharge device, a voltage divider sensing input voltage, and a Rogowski coil measuring the main discharge current. A computer program then analyses frequency components in these signals and provides information as to whether the discharge event was normal or any breakdown fault occurred inside the coaxial device. The diagnostic system is developed for a 450 kV and 50 kA capillary discharge plasma setup. For the setup various possible faults are analyzed by electrical simulation, followed by experimental results. In the case of normal discharge through the capillary load the dominant frequency is ?4 MHz. Under faulty conditions, the peak in magnitude versus frequency plot of the antenna signal changes according to the fault position which involves different paths causing variation in the equivalent circuit elements. PMID:21361621

Nigam, S; Aneesh, K; Navathe, C P; Gupta, P D

2011-02-01

315

A diagnostic system for electrical faults in a high current discharge plasma setup  

NASA Astrophysics Data System (ADS)

A diagnostic system to detect electrical faults inside a coaxial high current discharge device is presented here. This technique utilizes two biconical antennas picking up electromagnetic radiation from the discharge device, a voltage divider sensing input voltage, and a Rogowski coil measuring the main discharge current. A computer program then analyses frequency components in these signals and provides information as to whether the discharge event was normal or any breakdown fault occurred inside the coaxial device. The diagnostic system is developed for a 450 kV and 50 kA capillary discharge plasma setup. For the setup various possible faults are analyzed by electrical simulation, followed by experimental results. In the case of normal discharge through the capillary load the dominant frequency is ˜4 MHz. Under faulty conditions, the peak in magnitude versus frequency plot of the antenna signal changes according to the fault position which involves different paths causing variation in the equivalent circuit elements.

Nigam, S.; Aneesh, K.; Navathe, C. P.; Gupta, P. D.

2011-02-01

316

Optical diagnostics for condensed-phase shock-compressed molecular systems  

SciTech Connect

Experimental techniques capable of obtaining information about the molecular phenomenology in the region through and immediately behind the shockfront during the shock-compression of condensed-phase molecular systems are discussed and compared. Difficulties associated with performing measurements in this region are briefly reviewed. Some concomitant static experiments that can be used to complement the dynamic measurements are suggested. Developments and advances expected in diagnostic techniques during the next few years are summarized.

Schmidt, S.C.; Moore, D.S.; Shaner, J.W.

1983-01-01

317

Double Balloon Enteroscopy: A Useful Tool for Diagnostic and Therapeutic Procedures in the Pancreaticobiliary System  

Microsoft Academic Search

OBJECTIVES:Diagnostic and therapeutic interventions in the biliary and pancreatic system in the previously operated patient by conventional endoscopic retrograde cholangiopancreaticography (ERCP) are difficult and, depending on the surgical procedure, in many cases unsuccessful. We describe our experience of ERCP performed with a double balloon enteroscope (DBE) as an alternative examination technique for these patients.METHODS:In a retrospective analysis of all DBE

Christian Maaser; Frank Lenze; Maja Bokemeyer; Hansjoerg Ullerich; Dirk Domagk; Matthias Bruewer; Andreas Luegering; Wolfram Domschke; Torsten Kucharzik

2008-01-01

318

Process Models for High Performance Telecom Systems  

E-print Network

is a keystone in server architectures. With process models we mean how and when operating system processes are created, managed and terminated at ap- plication level. A fine-grained number of processes provide fault

Maguire Jr., Gerald Q.

319

Assessment of the potential impact of a reminder system on the reduction of diagnostic errors: a quasi-experimental study  

Microsoft Academic Search

BACKGROUND: Computerized decision support systems (DSS) have mainly focused on improving clinicians' diagnostic accuracy in unusual and challenging cases. However, since diagnostic omission errors may predominantly result from incomplete workup in routine clinical practice, the provision of appropriate patient- and context-specific reminders may result in greater impact on patient safety. In this experimental study, a mix of easy and difficult

Padmanabhan Ramnarayan; Graham C Roberts; Michael Coren; Vasantha Nanduri; Amanda Tomlinson; Paul M Taylor; Jeremy C Wyatt; Joseph F Britto

2006-01-01

320

A filter bank system for scattered spectrum analysis in collective Thomson scattering diagnostic on JT-60  

NASA Astrophysics Data System (ADS)

In JT-60, a collective Thomson scattering (CTS) diagnostic system based on a pulsed CO2 laser (wavelength 10.6 ?m, beam energy 15 J, pulse width 1 ?s) has been developed to measure ion temperature and velocity distribution of fast ions to demonstrate the feasibility of measurements of confined alpha particles. A high power pulsed CO2 laser and heterodyne receiver system using a quantum-well infrared photodetector (QWIP) has been developed and installed in the diagnostic room. In order to resolve frequency distribution of pulsed scattered light (1 ?s), we developed a wideband filter bank system (0.4-4.5 GHz) for scattered spectrum analysis in JT-60 CTS diagnostic. The detector bandwidth and frequency resolution are both determined by the calculation results of expected scattered spectrum. In order to realize wideband multichannel detection, cascade connected seventh order simultaneous-Chebyshev (elliptic) bandpass filters were adopted. Signal to noise ratio based on the noise equivalent power of the QWIP receiver and laser pulse length are also evaluated.

Lee, S.; Kondoh, T.; Yonemoto, Y.; Miura, Y.

2000-12-01

321

The Sandtray Technique for Swedish Children 1945-1960: Diagnostics, Psychotherapy and Processes of Individualisation  

ERIC Educational Resources Information Center

The present article examines the development of a diagnostic and therapeutic technique named The Sandtray at the Erica Foundation, a privately-run child counselling service in Stockholm. Originally it was called The World, developed by the British paediatrician and child psychiatrist Margaret Lowenfeld. In the 1930s it was imported to Sweden,…

Nelson, Karin Zetterqvist

2011-01-01

322

Transparent Process Migration Sprite Operating System  

E-print Network

Transparent Process Migration in the Sprite Operating System Frederick Douglis Computer Science, California 94720 September 1990 #12; Transparent Process Migration in the Sprite Operating System Copyright c MICRO program. #12; ii Transparent Process Migration in the Sprite Operating System by Frederick Douglis

Douglis, Fred

323

Report on the experience with the Supervisory Control and Diagnostics System (SCDS) of MFTF-B  

SciTech Connect

The Supervisory Control and Diagnostics System (SCDS) of MFTF is a multiprocessor computer system using graphics oriented displays with touch sensitive panels as the primary operator interface. Late in the calendar year 1981 the system was used to control an integrated test of the vacuum vessel, vacuum system, cryogenics system and the superconducting magnet of MFTF. Since the completion of those tests and starting in early calendar 1983 the system has been used for control of the neutral beam test facility at LLNL. This paper presents a short overview of SCDS for the purpose of orientation and then proceeds to describe the difficulties encountered in these preliminary encounters with reality. The band-aids used to hold things together as disaster threatened as well as the long-term solutions to the problems will be discussed. Finally, we will present some comments on system costs and management philosophy.

Wyman, R.H.

1983-11-18

324

Video and Image Processing in Multimedia Systems (Video Processing)  

E-print Network

COT 6930 Video and Image Processing in Multimedia Systems (Video Processing) Instructor: Borko. Content-based image and video indexing and retrieval. Video processing using compressed data. Course concepts and structures 4. Classification of compression techniques 5. Image and video compression

Furht, Borko

325

KHz combustion diagnostics by means of an onboard drop capsule laser system  

NASA Astrophysics Data System (ADS)

kHz combustion diagnostics by means of an onboard drop capsule laser system We present an onboard drop capsule laser system, based on a combination of two diode-pumped solid-state Yb:YAG disk lasers. The laser system itself consists of oscillator (seed laser), power amplifier and frequency conversion units which are mounted on three platforms designed for high mechanical stability at minimal weight. The design of the cw seed laser -including frequency selective elements like intracavity etalon and two birefringent filters -yields a tuning range from 1005 nm to 1053 nm. A Pockels cell is used to generate short pulses (10 ns) at repetition rates of up to 4 kHz. Subsequently, the spectrally and temporally well defined pulses (?? << 1 pm, 10 ns, M2 = 1.3) are amplified in the Yb:YAG disk regenerative amplifier on the second platform. The amplification results in pulse energies of up to 25 mJ, depending both on the power pumping the Yb:YAG disk and the number of round trips within the resonator. The third platform accommodates crystals for second, third or fourth harmonic generation of the laser fundamental (SHG, THG, FHG) as well as beam shaping optics for experiments. Conversion efficiencies of 20% and 10% can be achieved for THG and FHG (UV spectral region around 343 nm and 257 nm), respectively. Thus, a number of combustion-relevant species like OH or formaldehyde can be investigated in this way. The laser provides excellent beam quality combined with a broad tuning range in single-frequency mode as well as high pulse energies at high repetition rates. These features enable the tracking of fast processes like turbulences or ignition. To demonstrate the capabilities of the drop capsule laser system at 1 kHz under µg-conditions, we investigated flame turbulences of a v-shaped H2 /O2 -burner recorded by means of a high speed intensified camera. The temporally and spatially resolved imaging of the flame turbulence is realized by planar laser induced fluo-rescence (PLIF) of OH radicals at 308 nm, using the third harmonics of the laser fundamental around 343.8 nm.

Paa, Wolfgang; Wagner, Volker; Klinkov, Konstantin; Eigenbrod, Christian

326

Design of a New Optical System for Alcator C-Mod Motional Stark Effect Diagnostic  

SciTech Connect

The motional Stark effect (MSE) diagnostic on Alcator C-Mod uses an in-vessel optical system (five lenses and three mirrors) to relay polarized light to an external polarimeter because port access limitations on Alcator C-Mod preclude a direct view of the diagnostic beam. The system experiences unacceptable, spurious drifts of order several degrees in measured pitch angle over the course of a run day. Recent experiments illuminated the MSE diagnostic with polarized light of fixed orientation as heat was applied to various optical elements. A large change in measured angle was observed as two particular lenses were heated, indicating that thermal-stress-induced birefringence is a likely cause of the spurious variability. Several new optical designs have been evaluated to eliminate the affected in-vessel lenses and to replace the focusing they provide with curved mirrors; however, ray tracing calculations imply that this method is not feasible. A new approach is under consideration that utilizes in situ calibrations with in-vessel reference polarized light sources. 2008 American Institute of Physics.

Jinseok Ko, Steve Scott, Manfred Bitter, and Scott Lerner

2009-11-12

327

Diagnostic imaging of the nasolacrimal drainage system. Part I. Radiological anatomy of lacrimal pathways. Physiology of tear secretion and tear outflow.  

PubMed

Excessive watering of the eye is a common condition in ophthalmological practice. It may be the result of excessive production of tear fluid or obstruction and insufficiency of efferent tear pathways. The differentiation between obstruction and insufficiency of the lacrimal pathways is still clinically questionable. In the diagnostic process it is necessary to perform clinical tests and additional diagnostic imaging is often needed. Dacryocystography, with or without the extension of the dynamic phase or subtraction option, still remains the criterion standard for diagnostic imaging of the lacrimal obstruction. It may help to clarify the cause and exact place of the obstruction and provide information for further management, especially surgical treatment. Increasingly, new techniques are used in diagnostic imaging of the lacrimal tract, such as computed tomography, magnetic resonance, and isotopic methods. Adequate knowledge of the anatomy and physiology of the lacrimal system and the secretion and outflow of tears is the basis for proper diagnostic imaging. The purpose of this paper is to present the exact anatomy of the lacrimal system, with particular emphasis on the radiological anatomy and the current state of knowledge about the physiology of tear secretion and drainage. PMID:24743297

Maliborski, Artur; Ró?ycki, Rados?aw

2014-01-01

328

Diagnostic imaging of the nasolacrimal drainage system. Part I. Radiological anatomy of lacrimal pathways. Physiology of tear secretion and tear outflow  

PubMed Central

Excessive watering of the eye is a common condition in ophthalmological practice. It may be the result of excessive production of tear fluid or obstruction and insufficiency of efferent tear pathways. The differentiation between obstruction and insufficiency of the lacrimal pathways is still clinically questionable. In the diagnostic process it is necessary to perform clinical tests and additional diagnostic imaging is often needed. Dacryocystography, with or without the extension of the dynamic phase or subtraction option, still remains the criterion standard for diagnostic imaging of the lacrimal obstruction. It may help to clarify the cause and exact place of the obstruction and provide information for further management, especially surgical treatment. Increasingly, new techniques are used in diagnostic imaging of the lacrimal tract, such as computed tomography, magnetic resonance, and isotopic methods. Adequate knowledge of the anatomy and physiology of the lacrimal system and the secretion and outflow of tears is the basis for proper diagnostic imaging. The purpose of this paper is to present the exact anatomy of the lacrimal system, with particular emphasis on the radiological anatomy and the current state of knowledge about the physiology of tear secretion and drainage. PMID:24743297

Maliborski, Artur; Rozycki, Radoslaw

2014-01-01

329

Helminth parasitic infections of the central nervous system: a diagnostic approach.  

PubMed

Helminth parasitic infections of the central nervous system (CNS) occur worldwide with high prevalence in tropical and subtropical countries. Clinical evaluation of patients is mandatory, and it is convenient to group the clinical manifestations into syndromes: for example space-occupying lesions, meningitis, and encephalitis. The history should focus on residence or travel to endemic areas, diet, activities, intercurrent medical conditions, and associated clinical clues. Direct parasitological diagnosis can be reached by cerebrospinal fluid and cerebral tissue examination either by microscopy, culture, or immunological techniques. Immunodiagnosis by detection of parasite antibodies or antigens in serum could provide indirect evidence of parasitic infections. In addition, various imaging and radiological techniques e.g., computed tomography (CT) scan and magnetic resonance imaging (MRI) complement the diagnostic work-up of CNS diseases. Finally, the helminthic CNS infections of global impact, such as schistosomiasis, neurotoxocariasis, Strongyloides infection, neurotrichinosis, neurocysticercosis, and echinococcosis will be briefly discussed as regards the principal clinical and diagnostic features. PMID:24961012

Othman, Ahmad A; Bruschi, Fabrizio; Ganna, Ahmed A

2014-04-01

330

A Model-based Health Monitoring and Diagnostic System for the UH-60 Helicopter. Appendix D  

NASA Technical Reports Server (NTRS)

Model-based reasoning techniques hold much promise in providing comprehensive monitoring and diagnostics capabilities for complex systems. We are exploring the use of one of these techniques, which utilizes multi-signal modeling and the TEAMS-RT real-time diagnostic engine, on the UH-60 Rotorcraft Aircrew Systems Concepts Airborne Laboratory (RASCAL) flight research aircraft. We focus on the engine and transmission systems, and acquire sensor data across the 1553 bus as well as by direct analog-to-digital conversion from sensors to the QHuMS (Qualtech health and usage monitoring system) computer. The QHuMS computer uses commercially available components and is rack-mounted in the RASCAL facility. A multi-signal model of the transmission and engine subsystems enables studies of system testability and analysis of the degree of fault isolation available with various instrumentation suites. The model and examples of these analyses will be described and the data architectures enumerated. Flight tests of this system will validate the data architecture and provide real-time flight profiles to be further analyzed in the laboratory.

Patterson-Hine, Ann; Hindson, William; Sanderfer, Dwight; Deb, Somnath; Domagala, Chuck

2001-01-01

331

GPLS VME MODULE: A DIAGNOSTIC AND DISPLAY TOOL FOR NSLS MICRO SYSTEMS.  

SciTech Connect

The General Purpose Light Source VME module is an integral part of every front-end micro in the NSLS control system. The board incorporates features such as a video character generator, clock signals, time-of-day clock, a VME bus interrupter and general-purpose digital inputs and outputs. This module serves as a valuable diagnostic and real-time display tool for the micro development as well as for the final operational systems. This paper describes the functions provided by the board for the NSLS micro control monitor software.

RAMAMOORTHY,S.; SMITH,J.D.

1999-03-29

332

Expert systems trains, advises process operators  

Microsoft Academic Search

This paper discusses a prototype, on-line expert system that has been developed to advise and train process operators. The system models the experience and decision making capability of the operator, rather than automating the decision process by modeling process equipment and operations. The system, called OpAS for Operator Advisor System, coaches operators to make correct decisions so that consistent shift-to-shift

T. Touchstone; D. E. Blackwell; G. E. Carter; J. K. Kramer

1990-01-01

333

Development of an On-board Failure Diagnostics and Prognostics System for Solid Rocket Booster  

NASA Technical Reports Server (NTRS)

We develop a case breach model for the on-board fault diagnostics and prognostics system for subscale solid-rocket boosters (SRBs). The model development was motivated by recent ground firing tests, in which a deviation of measured time-traces from the predicted time-series was observed. A modified model takes into account the nozzle ablation, including the effect of roughness of the nozzle surface, the geometry of the fault, and erosion and burning of the walls of the hole in the metal case. The derived low-dimensional performance model (LDPM) of the fault can reproduce the observed time-series data very well. To verify the performance of the LDPM we build a FLUENT model of the case breach fault and demonstrate a good agreement between theoretical predictions based on the analytical solution of the model equations and the results of the FLUENT simulations. We then incorporate the derived LDPM into an inferential Bayesian framework and verify performance of the Bayesian algorithm for the diagnostics and prognostics of the case breach fault. It is shown that the obtained LDPM allows one to track parameters of the SRB during the flight in real time, to diagnose case breach fault, and to predict its values in the future. The application of the method to fault diagnostics and prognostics (FD&P) of other SRB faults modes is discussed.

Smelyanskiy, Vadim N.; Luchinsky, Dmitry G.; Osipov, Vyatcheslav V.; Timucin, Dogan A.; Uckun, Serdar

2009-01-01

334

A Diagnostic Assessment of Evolutionary Multiobjective Optimization for Water Resources Systems  

NASA Astrophysics Data System (ADS)

This study contributes a rigorous diagnostic assessment of state-of-the-art multiobjective evolutionary algorithms (MOEAs) and highlights key advances that the water resources field can exploit to better discover the critical tradeoffs constraining our systems. This study provides the most comprehensive diagnostic assessment of MOEAs for water resources to date, exploiting more than 100,000 MOEA runs and trillions of design evaluations. The diagnostic assessment measures the effectiveness, efficiency, reliability, and controllability of ten benchmark MOEAs for a representative suite of water resources applications addressing rainfall-runoff calibration, long-term groundwater monitoring (LTM), and risk-based water supply portfolio planning. The suite of problems encompasses a range of challenging problem properties including (1) many-objective formulations with 4 or more objectives, (2) multi-modality (or false optima), (3) nonlinearity, (4) discreteness, (5) severe constraints, (6) stochastic objectives, and (7) non-separability (also called epistasis). The applications are representative of the dominant problem classes that have shaped the history of MOEAs in water resources and that will be dominant foci in the future. Recommendations are provided for which modern MOEAs should serve as tools and benchmarks in the future water resources literature.

Reed, P.; Hadka, D.; Herman, J.; Kasprzyk, J.; Kollat, J.

2012-04-01

335

COMPREHENSIVE DIAGNOSTIC AND IMPROVEMENT TOOLS FOR HVAC-SYSTEM INSTALLATIONS IN LIGHT COMMERCIAL BUILDINGS  

SciTech Connect

Proctor Engineering Group, Ltd. (PEG) and Carrier-Aeroseal LLP performed an investigation of opportunities for improving air conditioning and heating system performance in existing light commercial buildings. Comprehensive diagnostic and improvement tools were created to address equipment performance parameters (including airflow, refrigerant charge, and economizer operation), duct-system performance (including duct leakage, zonal flows and thermal-energy delivery), and combustion appliance safety within these buildings. This investigation, sponsored by the National Energy Technology Laboratory, a division of the U.S. Department of Energy, involved collaboration between PEG and Aeroseal in order to refine three technologies previously developed for the residential market: (1) an aerosol-based duct sealing technology that allows the ducts to be sealed remotely (i.e., without removing the ceiling tiles), (2) a computer-driven diagnostic and improvement-tracking tool for residential duct installations, and (3) an integrated diagnosis verification and customer satisfaction system utilizing a combined computer/human expert system for HVAC performance. Prior to this work the aerosol-sealing technology was virtually untested in the light commercial sector--mostly because the savings potential and practicality of this or any other type of duct sealing had not been documented. Based upon the field experiences of PEG and Aeroseal, the overall product was tailored to suit the skill sets of typical HVAC-contractor personnel.

Abram Conant; Mark Modera; Joe Pira; John Proctor; Mike Gebbie

2004-10-31

336

Bench-to-bedside review: Future novel diagnostics for sepsis - a systems biology approach  

PubMed Central

The early, accurate diagnosis and risk stratification of sepsis remains an important challenge in the critically ill. Since traditional biomarker strategies have not yielded a gold standard marker for sepsis, focus is shifting towards novel strategies that improve assessment capabilities. The combination of technological advancements and information generated through the human genome project positions systems biology at the forefront of biomarker discovery. While previously available, developments in the technologies focusing on DNA, gene expression, gene regulatory mechanisms, protein and metabolite discovery have made these tools more feasible to implement and less costly, and they have taken on an enhanced capacity such that they are ripe for utilization as tools to advance our knowledge and clinical research. Medicine is in a genome-level era that can leverage the assessment of thousands of molecular signals beyond simply measuring selected circulating proteins. Genomics is the study of the entire complement of genetic material of an individual. Epigenetics is the regulation of gene activity by reversible modifications of the DNA. Transcriptomics is the quantification of the relative levels of messenger RNA for a large number of genes in specific cells or tissues to measure differences in the expression levels of different genes, and the utilization of patterns of differential gene expression to characterize different biological states of a tissue. Proteomics is the large-scale study of proteins. Metabolomics is the study of the small molecule profiles that are the terminal downstream products of the genome and consists of the total complement of all low-molecular-weight molecules that cellular processes leave behind. Taken together, these individual fields of study may be linked during a systems biology approach. There remains a valuable opportunity to deploy these technologies further in human research. The techniques described in this paper not only have the potential to increase the spectrum of diagnostic and prognostic biomarkers in sepsis, but they may also enable the discovery of new disease pathways. This may in turn lead us to improved therapeutic targets. The objective of this paper is to provide an overview and basic framework for clinicians and clinical researchers to better understand the 'omics technologies' to enhance further use of these valuable tools. PMID:24093155

2013-01-01

337

Process Cooling Pumping Systems Analysis  

E-print Network

rejection while operating three pumps each. 2. Check Valve induced Pump Failure – While attempting to take readings, both systems exhibited check valve failure to hold. This failure causes significant short-circuiting of water to the cold well, causing...

Sherman, C.

2008-01-01

338

Diagnostic Immunopathology  

PubMed Central

The application of immunologic techniques to tissue sections has added a new dimension to the investigation and classification of various processes. Virtually every section of diagnostic pathology has been enhanced by using specific monoclonal antibodies or polyclonal antiserum. Neoplasms formerly diagnosed as poorly differentiated or anaplastic may be precisely identified as to their origin through the use of specific membrane or cytoplasmic markers. Other cellular products, including viruses, hormones, enzymes or highly specific proteins, are also available to study neoplastic and nonneoplastic processes. New and more specific reagents are regularly becoming available for the diagnostic repertoire of pathologists. We present some of the principles of diagnostic immunopathology to show the scope and importance of the techniques. ImagesFigure 2.Figure 3. PMID:3529633

Cancilla, Pasquale A.; Cochran, Alistair J.; Naeim, Faramarz; Said, Jonathan W.

1986-01-01

339

A centralized data processing system  

Microsoft Academic Search

Early in the spring of 1953 with the activation of a ground telemetering facility at the Air Force Flight Test Center it became evident that there existed a real and continually increasing need for a less expensive, faster and more reliable method of processing extremely large amounts of raw uncorrected data that found its origin in the many diversified activities

Jerome J. Dover

1954-01-01

340

Feasibility Investigation on the Development of a Structural Damage Diagnostic and Monitoring System for Rocket Engines  

NASA Technical Reports Server (NTRS)

The research activity for this project is mainly to investigate the necessity and feasibility to develop a structural health monitoring system for rocket engines, and to carry out a research plan for further development of the system. More than one hundred technical papers have been searched and reviewed during the period. We concluded after this investigation that adding a new module in NASA's existing automated diagnostic system to monitor the healthy condition of rocket engine structures is a crucial task, and it's possible to develop such a system based upon the vibrational-based nondestructive damage assessment techniques. A number of such techniques have been introduced. Their advantages and disadvantages are also discussed. A global research plan has been figured out. As the first step of the overall research plan, a proposal for the next fiscal year has been submitted.

Shen, Ji Y.; Sharpe, Lonnie, Jr.

1998-01-01

341

Probabilistic techniques using Monte Carlo sampling for multi- component system diagnostics  

SciTech Connect

We outline the structure of a new approach at multi-component system fault diagnostics which utilizes detailed system simulation models, uncertain system observation data, statistical knowledge of system parameters, expert opinion, and component reliability data in an effort to identify incipient component performance degradations of arbitrary number and magnitude. The technique involves the use of multiple adaptive Kalman filters for fault estimation, the results of which are screened using standard hypothesis testing procedures to define a set of component events that could have transpired. Latin Hypercube sample each of these feasible component events in terms of uncertain component reliability data and filter estimates. The capabilities of the procedure are demonstrated through the analysis of a simulated small magnitude binary component fault in a boiling water reactor balance of plant. The results show that the procedure has the potential to be a very effective tool for incipient component fault diagnosis.

Aumeier, S.E. [Argonne National Lab., Idaho Falls, ID (United States); Lee, J.C.; Akcasu, A.Z. [Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering

1995-06-01

342

Vibration mitigation in J-TEXT far-infrared diagnostic systems  

SciTech Connect

Optical structure stability is an important issue for far-infrared (FIR) phase measurements. To ensure good signal quality, influence of vibration should be minimized. Mechanical amelioration and optical optimization can be taken in turn to decrease vibration's influence and ensure acceptable measurement. J-TEXT (Joint Texal Experiment Tokamak, formerly TEXT-U) has two FIR diagnostic systems: a HCN interferometer system for electron density measurement and a three-wave polarimeter-interferometer system (POLARIS) for electron density and Faraday effect measurements. All use phase detection techniques. HCN interferometer system has almost eliminated the influence of vibration after mechanical amelioration and optical optimization. POLARIS also obtained first experimental results after mechanical stability improvements and is expected to further reduce vibration's influence on Faraday angle to 0.1 Degree-Sign after optical optimization.

Li, Q.; Chen, J.; Zhuang, G.; Wang, Z. J.; Gao, L.; Chen, W. [State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074 (China)

2012-10-15

343

Expert system for the plasma spray process  

SciTech Connect

The plasma spray process, like other thermal spray processes, has few on-line monitoring sensors and many process variables which cannot be easily and precisely formulated. This provides an opportunity for improving and controlling the process through artificial intelligence. An expert system has been constructed for selecting plasma spray parameters in the development of new coatings. The expert system is based on operator experience and heuristics on the subject using symbolic reasoning, and coupled with numerical calculations. For less experienced users, the system can assist in solving process problems.

Wang, H.; Petrone, S. [Sherritt Inc., Fort Saskatchewan, Alberta (Canada)

1994-12-31

344

Pattern classification approach to rocket engine diagnostics  

SciTech Connect

This paper presents a systems level approach to integrate state-of-the-art rocket engine technology with advanced computational techniques to develop an integrated diagnostic system (IDS) for future rocket propulsion systems. The key feature of this IDS is the use of advanced diagnostic algorithms for failure detection as opposed to the current practice of redline-based failure detection methods. The paper presents a top-down analysis of rocket engine diagnostic requirements, rocket engine operation, applicable diagnostic algorithms, and algorithm design techniques, which serve as a basis for the IDS. The concepts of hierarchical, model-based information processing are described, together with the use uf signal processing, pattern recognition, and artificial intelligence techniques which are an integral part of this diagnostic system. 27 refs.

Tulpule, S.

1989-01-01

345

Central Nervous System Involvement in Adult Acute Lymphoblastic Leukemia: Diagnostic Tools, Prophylaxis, and Therapy  

PubMed Central

In adult patients with acute lymphoblastic leukemia (ALL), Central Nervous System (CNS) involvement is associated with a very poor prognosis. The diagnostic assessment of this condition relies on the use of neuroradiology, conventional cytology (CC) and flow cytometry (FCM). Among these approaches, which is the gold standard it is still a matter of debate. Neuroradiology and CC have a limited sensitivity with a higher rate of false negative results. FCM demonstrated a superior sensitivity over CC, particularly when low levels of CNS infiltrating cells are present. Although prospective studies of a large series of patients are still awaited, a positive finding by FCM appears to anticipate an adverse outcome even if CC shows no infiltration. Current strategies for adult ALL CNS-directed prophylaxis or therapy involve systemic and intrathecal chemotherapy and radiation therapy. An early and frequent intrathecal injection of cytostatic combined with systemic chemotherapy is the most effective strategy to reduce the frequency of CNS involvement. In patients with CNS overt ALL, at diagnosis or upon relapse, allogeneic hematopoietic stem cell transplantation might be considered. This review discusses risk factors, diagnostic techniques for identification of CNS infiltration and modalities of prophylaxis and therapy to manage it. PMID:25408861

Del Principe, Maria Ilaria; Maurillo, Luca; Buccisano, Francesco; Sconocchia, Giuseppe; Cefalo, Mariagiovanna; De Santis, Giovanna; Di Veroli, Ambra; Ditto, Concetta; Nasso, Daniela; Postorino, Massimiliano; Refrigeri, Marco; Attrotto, Cristina; Del Poeta, Giovanni; Lo-Coco, Francesco; Amadori, Sergio; Venditti, Adriano

2014-01-01

346

Evaluation of process systems operating envelopes  

E-print Network

This thesis addresses the problem of worst-case steady-state design of process systems under uncertainty, also known as robust design. Designing for the worst case is of great importance when considering systems for ...

Stuber, Matthew David

2013-01-01

347

Vehicle Processing Readiness Course: Aerospace Systems  

NSDL National Science Digital Library

This document from SpaceTEC National Aerospace Technical Education Center presents a vehicle processing readiness course on aerospace systems. It includes materials related to basic flight principles, safety, orbits, propulsion, structure and electromechanical systems.

Fletcher, Bill

2011-06-01

348

Optical property measurements as a diagnostic tool for control of materials processing in space and on Earth  

NASA Technical Reports Server (NTRS)

A new method is described, including results, to measure, control, and follow containerless processing in ground based levitators. This technique enables instantaneous optical property measurements from a transient solid or liquid surface concurrent with true temperature measurement. This was used successfully as a diagnostic tool to follow processing of Al, Si, and Ti during electromagnetic levitation. Experiments on Al show the disappearance of the oxide (emittance 0.33) at ca. 1300 C leaving a liquid surface with an emittance of 0.06. Electromagnetic levitation of silicon shows a liquid with a constant emittance (0.2) but with a solid whose emittance decreases very rapidly with increasing temperature. Consequently, the processing of materials at high temperatures can be controlled quite well through the control of surface optical properties.

Krishnan, Shankar; Weber, J. K. Richard; Nordine, Paul C.; Schiffman, Robert A.

1990-01-01

349

Diagnostic reasoning model validation in digestive endoscopy  

Microsoft Academic Search

The development of a computer-assisted diagnostic system in digestive endoscopy implies to understand the reasoning process of endoscopists. The aim of this study is to validate a reasoning model and a knowledge base previously defined. Eight endoscopists have participated to a diagnostic test including 5 video-sequences and using a \\

J. M. Cauvin; C. Le Guillou; B. Solaiman; M. Robaszkiewicz; H. Gouerou; C. Roux

2001-01-01

350

Oil recovery system and process  

SciTech Connect

A process and apparatus for recovering oil from an oil-bearing formation which comprises the steps of injecting into the oil-bearing formation a heated aerosol fog of organic chemicals which are soluble in oil, the fog preferably being at an elevated temperature and pressure. The heated aerosol fog penetrates the formation dissolving caked oil and oil trapped within the formation thereby increasing its permeability. The dissolved oil is extracted from the formation along with the injected chemicals and the chemicals are thereafter separated from the oil.

Livingston, A.M.

1984-01-03

351

Development of a medical image capture, formatting, and display system in support of a medical diagnostic center  

NASA Astrophysics Data System (ADS)

Today's concern over rising medical costs demands that medical diagnostic systems have cost effective life cycles. The design of a Medical Image Capture, Formatting, and Display (MICFD) system must be based on an architectural approach utilizing new technologies for upgrades and modifications. The need to maintain a cost effective operation dictates flexible, easily upgradeable architectures. In the past, Image Capture, Formatting, and Display capabilities have been contained within a single medical diagnostic system and embodied an architectural approach that limited significant performance upgrades due to tight coupling between software and a specific vendor's hardware. Significant capability enhancements to these systems could in the past only be accomplished by replacement of the entire system. The MICFD system described in this paper was specifically tailored to meet the needs of a Medical Diagnostic Center to monitor and analyze a diagnostic procedure through the use of state-of- the-art image capture, formatting, and display technologies. Further, the architecture is such that incremental enhancements can be made to strengthen budget profiles. A review of the requirements for a MICFD system that will support multiple diagnostic systems and provide a method for minimizing life cycle cost is presented in this paper. To fulfill these requirements, SPARTAC (SPArta Real Time Analysis, Computation and Control Center) architecture and design concepts have been used.

Keyes, John A.; Bretz, James F.; Moore, Archie L.

1993-06-01

352

Cognitive Systems Foundations of Information Processing  

E-print Network

Cognitive Systems 2: Topics · Methods from psychology, neuroscience, informatics: Cognitive modeling1 Cognitive Systems Foundations of Information Processing in Natural and Artificial Systems 2010 Cognitive Systems 1: Topics · Perception · Memory and Reasoning · Learning and Action · Communication 3

Bremen, Universität

353

Diagnostic reliability of magnetic resonance imaging for central nervous system syndromes in systemic lupus erythematosus: a prospective cohort study  

PubMed Central

Background Previous studies of magnetic resonance imaging (MRI) as a diagnostic tool for central nervous system (CNS) syndromes in systemic lupus erythematosus (SLE) contained several limitations such as study design, number of enrolled patients, and definition of CNS syndromes. We overcame these problems and statistically evaluated the diagnostic values of abnormal MRI signals and their chronological changes in CNS syndromes of SLE. Methods We prospectively studied 191 patients with SLE, comparing those with (n = 57) and without (n = 134) CNS syndrome. CNS syndromes were characterized using the American College of Rheumatology case definitions. Results Any abnormal MRI signals were more frequently observed in subjects in the CNS group (n = 25) than in the non-CNS group (n = 32) [relative risk (RR), 1.7; 95% confidence interval (CI), 1.1-2.7; p = 0.016] and the positive and negative predictive values for the diagnosis of CNS syndrome were 42% and 76%, respectively. Large abnormal MRI signals (ø ? 10 mm) were seen only in the CNS group (n = 7; RR, 3.7; CI, 2.9-4.7; p = 0.0002), whereas small abnormal MRI signals (ø < 10 mm) were seen in both groups with no statistical difference. Large signals always paralleled clinical outcome (p = 0.029), whereas small signals did not (p = 1.000). Conclusions Abnormal MRI signals, which showed statistical associations with CNS syndrome, had insufficient diagnostic values. A large MRI signal was, however, useful as a diagnostic and surrogate marker for CNS syndrome of SLE, although it was less common. PMID:20096132

2010-01-01

354

Multichannel image processing system for thermal supervision systems  

Microsoft Academic Search

Foundation principles of multichannel real-time information processing system which is solving a problem of automatic object tracking are considered in this work. Image processing algorithms which are used for three-channel system foundation and optimally approaching for system core-Microprocessor Neuro Matrix NM6403 are realized. Information processing is accomplished with using of Hopfield neural network one 384x288 frame processing time is about

A. A. Zorin; I. I. Razumova; V. A. Tarkov

2005-01-01

355

Information Processing Capacity of Dynamical Systems  

NASA Astrophysics Data System (ADS)

Many dynamical systems, both natural and artificial, are stimulated by time dependent external signals, somehow processing the information contained therein. We demonstrate how to quantify the different modes in which information can be processed by such systems and combine them to define the computational capacity of a dynamical system. This is bounded by the number of linearly independent state variables of the dynamical system, equaling it if the system obeys the fading memory condition. It can be interpreted as the total number of linearly independent functions of its stimuli the system can compute. Our theory combines concepts from machine learning (reservoir computing), system modeling, stochastic processes, and functional analysis. We illustrate our theory by numerical simulations for the logistic map, a recurrent neural network, and a two-dimensional reaction diffusion system, uncovering universal trade-offs between the non-linearity of the computation and the system's short-term memory.

Dambre, Joni; Verstraeten, David; Schrauwen, Benjamin; Massar, Serge

2012-07-01

356

AVIRIS ground data-processing system  

NASA Technical Reports Server (NTRS)

The Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) has been under development at JPL for the past four years. During this time, a dedicated ground data-processing system has been designed and implemented to store and process the large amounts of data expected. This paper reviews the objectives of this ground data-processing system and describes the hardware. An outline of the data flow through the system is given, and the software and incorporated algorithms developed specifically for the systematic processing of AVIRIS data are described.

Reimer, John H.; Heyada, Jan R.; Carpenter, Steve C.; Deich, William T. S.; Lee, Meemong

1987-01-01

357

IMAGES: An interactive image processing system  

NASA Technical Reports Server (NTRS)

The IMAGES interactive image processing system was created specifically for undergraduate remote sensing education in geography. The system is interactive, relatively inexpensive to operate, almost hardware independent, and responsive to numerous users at one time in a time-sharing mode. Most important, it provides a medium whereby theoretical remote sensing principles discussed in lecture may be reinforced in laboratory as students perform computer-assisted image processing. In addition to its use in academic and short course environments, the system has also been used extensively to conduct basic image processing research. The flow of information through the system is discussed including an overview of the programs.

Jensen, J. R.

1981-01-01

358

Optical diagnostics based on elastic scattering: Recent clinical demonstrations with the Los Alamos Optical Biopsy System  

SciTech Connect

A non-invasive diagnostic tool that could identify malignancy in situ and in real time would have a major impact on the detection and treatment of cancer. We have developed and are testing early prototypes of an optical biopsy system (OBS) for detection of cancer and other tissue pathologies. The OBS invokes a unique approach to optical diagnosis of tissue pathologies based on the elastic scattering properties, over a wide range of wavelengths, of the microscopic structure of the tissue. The use of elastic scattering as the key to optical tissue diagnostics in the OBS is based on the fact that many tissue pathologies, including a majority of cancer forms, manifest significant architectural changes at the cellular and sub-cellular level. Since the cellular components that cause elastic scattering have dimensions typically on the order of visible to near-IR wavelengths, the elastic (Mie) scattering properties will be strongly wavelength dependent. Thus, morphology and size changes can be expected to cause significant changes in an optical signature that is derived from the wavelength dependence of elastic scattering. The data acquisition and storage/display time with the OBS instrument is {approximately}1 second. Thus, in addition to the reduced invasiveness of this technique compared with current state-of-the-art methods (surgical biopsy and pathology analysis), the OBS offers the possibility of impressively faster diagnostic assessment. The OBS employs a small fiber-optic probe that is amenable to use with any endoscope, catheter or hypodermic, or to direct surface examination (e.g. as in skin cancer or cervical cancer). It has been tested in vitro on animal and human tissue samples, and clinical testing in vivo is currently in progress.

Bigio, I.J.; Loree, T.R.; Mourant, J.; Shimada, T. [Los Alamos National Lab., NM (United States); Story-Held, K.; Glickman, R.D. [Texas Univ. Health Science Center, San Antonio, TX (United States). Dept. of Ophthalmology; Conn, R. [Lovelace Medical Center, Albuquerque, NM (United States). Dept. of Urology

1993-08-01

359

Application of advanced laser diagnostics to hypersonic wind tunnels and combustion systems.  

SciTech Connect

This LDRD was a Sandia Fellowship that supported Andrea Hsu's PhD research at Texas A&M University and her work as a visitor at Sandia's Combustion Research Facility. The research project at Texas A&M University is concerned with the experimental characterization of hypersonic (Mach>5) flowfields using experimental diagnostics. This effort is part of a Multidisciplinary University Research Initiative (MURI) and is a collaboration between the Chemistry and Aerospace Engineering departments. Hypersonic flight conditions often lead to a non-thermochemical equilibrium (NTE) state of air, where the timescale of reaching a single (equilibrium) Boltzmann temperature is much longer than the timescale of the flow. Certain molecular modes, such as vibrational modes, may be much more excited than the translational or rotational modes of the molecule, leading to thermal-nonequilibrium. A nontrivial amount of energy is therefore contained within the vibrational mode, and this energy cascades into the flow as thermal energy, affecting flow properties through vibrational-vibrational (V-V) and vibrational-translational (V-T) energy exchanges between the flow species. The research is a fundamental experimental study of these NTE systems and involves the application of advanced laser and optical diagnostics towards hypersonic flowfields. The research is broken down into two main categories: the application and adaptation of existing laser and optical techniques towards characterization of NTE, and the development of new molecular tagging velocimetry techniques which have been demonstrated in an underexpanded jet flowfield, but may be extended towards a variety of flowfields. In addition, Andrea's work at Sandia National Labs involved the application of advanced laser diagnostics to flames and turbulent non-reacting jets. These studies included quench-free planar laser-induced fluorescence measurements of nitric oxide (NO) and mixture fraction measurements via Rayleigh scattering.

North, Simon W. (Texas A& M University, College Station, TX); Hsu, Andrea G. (Texas A& M University, College Station, TX); Frank, Jonathan H.

2009-09-01

360

Self-sustaining dose control system: ways to improve the exposure process  

NASA Astrophysics Data System (ADS)

In the semiconductor equipment business, self-metrology calls for in-situ measurements and diagnostics of the process parameters. For exposure tools, self-diagnostics and self-tuning are the core features. The present paper discusses a dose control system that allows for monitoring, correction and periodic self-calibration of the litho tool. Creation of such a system becomes a task even more complex in view of the aggressive illumination environment - 193 and 157 nm - that makes most traditional optical materials inapplicable; and causes many that are applicable to have time-varying performance.

Kivenzor, Gregory J.

2000-07-01

361

Systemic mast cell activation disease: the role of molecular genetic alterations in pathogenesis, heritability and diagnostics  

PubMed Central

Despite increasing understanding of its pathophysiology, the aetiology of systemic mast cell activation disease (MCAD) remains largely unknown. Research has shown that somatic mutations in kinases are necessary for the establishment of a clonal mast cell population, in particular mutations in the tyrosine kinase Kit and in enzymes and receptors with crucial involvement in the regulation of mast cell activity. However, other, as yet undetermined, abnormalities are necessary for the manifestation of clinical disease. The present article reviews molecular genetic research into the identification of disease-associated genes and their mutational alterations. The authors also present novel data on familial systemic MCAD and review the associated literature. Finally, the importance of understanding the molecular basis of inherited mutations in terms of diagnostics and therapy is emphasized. PMID:22957768

Haenisch, Britta; Nothen, Markus M; Molderings, Gerhard J

2012-01-01

362

The High Frequency Ultrasonic Diagnostic System for Hard and Soft Tissue Specific Assessments in Dentistry  

NASA Astrophysics Data System (ADS)

The numerical assessment of dental tissues is essential when selecting a relevant treatment protocol in the field of dentistry. This will have significant ramifications on the restoration quality of dental tissues. The aim of the research study presented in this thesis was to validate applicability and obtain non-invasively, quantitative data for hard and soft tissue thickness in dental applications. An ultrasonic system was developed and assembled for the purpose of these experiments. Numerous laboratory trials were conducted to validate system performance against traditional and destructive methods of assessment. Ultrasonic measurements were found to yield similar values to those obtained from invasive methods. Results obtained in these experiments have validated potentials of ultrasound as a supplementary diagnostic tool for dental healthcare.

Slak, Bartosz

363

Computer-aided diagnostic detection system of venous beading in retinal images  

NASA Astrophysics Data System (ADS)

The detection of venous beading in retinal images provides an early sign of diabetic retinopathy and plays an important role as a preprocessing step in diagnosing ocular diseases. We present a computer-aided diagnostic system to automatically detect venous beading of blood vessels. It comprises of two modules, referred to as the blood vessel extraction module and the venus beading detection module. The former uses a bell-shaped Gaussian kernel with 12 azimuths to extract blood vessels while the latter applies a neural network-based shape cognitron to detect venous beading among the extracted blood vessels for diagnosis. Both modules are fully computer-automated. To evaluate the proposed system, 61 retinal images (32 beaded and 29 normal images) are used for performance evaluation.

Yang, Ching-Wen; Ma, DyeJyun; Chao, ShuennChing; Wang, ChuinMu; Wen, Chia-Hsien; Lo, ChienShun; Chung, Pau-Choo; Chang, Chein-I.

2000-05-01

364

Development of a picosecond lidar system for large-scale combustion diagnostics.  

PubMed

In the present work, a picosecond lidar system aiming at single-ended combustion diagnostics in full-scale combustion devices with limited optical access, such as power plants, is described. The highest overall range resolution of the system was found to be <0.5 cm. A demonstration has been made in a nonsooty and sooty Bunsen burner flame. A well-characterized ethylene flame on a McKenna burner was evaluated for different equivalence ratios using Rayleigh thermometry. The results indicate both that picosecond lidar might be applicable for single-shot Rayleigh thermometry, even two-dimensional, and that there is a possibility to qualitatively map soot occurrence. Furthermore, differential absorption lidar has been investigated in acetone vapor jets for fuel visualization purposes. PMID:19183583

Kaldvee, Billy; Ehn, Andreas; Bood, Joakim; Aldén, Marcus

2009-02-01

365

Evaluating and tuning system response in the MFTF-B control and diagnostics computers  

SciTech Connect

The software system running on the Supervisory Control and Diagnostics System (SCDS) of MFTF-B is, for the major part, an event driven one. Regular, periodic polling of sensors' outputs takes place only at the local level, in the sensors' corresponding local control microcomputers (LCC's). An LCC reports a sensor's value to the supervisory computer only if there was a significant change. This report is passed as a message, routed among and acted upon by a network of applications and systems tasks within the supervisory computer (SCDS). Commands from the operator's console are similarly routed through a network of tasks, but in the oppostie direction to the experiment's hardware. In a network such as this, response time is partialy determined by system traffic. Because the hardware of MFTF-B will not be connected to the computer system for another two years, we are using the local control computers to simulate the event driven traffic that we expect to see during MFTF-B operation. In this paper we show how we are using the simulator to measure and evaluate response, loading, throughput, and utilization of components within the computer system. Measurement of the system under simulation allows us to identify bottlenecks and verify their unloosening. We also use the traffic simulators to evaluate prototypes of different algorithms for selected tasks, comparing their responses under the spectrum of traffic intensities.

Palasek, R.L.; Butner, D.N.; Minor, E.G.

1983-11-30

366

Hidden Markov model-based fault diagnostics method in speed-up and speed-down process for rotating machinery  

NASA Astrophysics Data System (ADS)

It is very important to ensure that the large rotating machinery operates safely and reliably. The behaviour characteristics of the speed-up and speed-down process in a rotating machinery possess the distinct diagnostic value. The abundant information, non-stationarity, poor repeatability and reproducibility in the speed-up and speed-down process lead to the necessity to find the corresponding approach of feature extraction and fault recognition. The Hidden Markov model (HMM) is very suitable for modelling the dynamic time series, and has a strong capability of pattern classification, especially for a signal with abundant information, non-stationarity, poor repeatability and reproducibility. At the same time, HMM can process the random long sequences in theory. Based on these features, HMM is very suitable for the signal from the speed-up and speed-down process in rotating machinery. As a result, HMM is introduced to the fault diagnosis of rotating machinery, and a new HMM-based approach of the fault diagnosis for the speed-up and speed-down process is proposed. The main idea of the proposed approach is that the feature vectors, which are obtained by the FFT, wavelet transform, bispectrum, etc., are used as fault features, respectively, and the HMMs as the classifiers to recognise the faults of the speed-up and speed-down process in rotating machinery. The experimental results show that the proposed approach is feasible and effective.

Li, Zhinong; Wu, Zhaotong; He, Yongyong; Fulei, Chu

2005-03-01

367

Decision support system for control and automation of dynamical processes. Master's thesis  

SciTech Connect

The thesis presents the concept and development of a diagnostic decision support system for real-time control and automation of dynamic processes. This system, known as DECA (Diagnostic Evaluation and Corrective Action), will take advantage of the computer's ability to manipulate vast amounts of data, and employ qualitative reasoning for the monitoring and diagnosis of dynamical processes during time-constrained, routine, and emergency situations where an immediate response is necessary to avoid catastrophic failure of the system. The software system's architecture has been structured in such a manner that is can be applied to any dynamic process without reprogramming. DECA is written in Lisp and was verified using the data from the Three Mile Island Nuclear Reactor Accident.

Nann, S.

1990-03-01

368

Diagnostic Radiology Guidelines.  

National Technical Information Service (NTIS)

The health systems agency that reviews certificate of need applications for replacing or adding diagnostic radiology equipment should benefit from these guidelines. To help determine need for diagnostic radiology equipment, the Health Services Council, In...

1978-01-01

369

Mining Association Rules from Clinical Databases: An Intelligent Diagnostic Process in Healthcare  

Microsoft Academic Search

Data mining is the process of discovering interesting knowledge, such as patterns, associations, changes, anomalies and significant structures, from large amounts of data stored in databases, data warehouses, or other information repositories. Mining Associations is one of the techniques involved in the process mentioned above and used in this paper. Association is the discovery of association relationships or correlations among

S. Stilou; P. D. Bamidis; N. Maglaveras; C. Pappas

2001-01-01

370

LASER PROCESSING AND DIAGNOSTICS (ME 290G) Two one and half lectures per week.  

E-print Network

Description: The course provides a detailed account of laser interactions with materials in the contexts-change, plasma formation. Ultra-fast (picosecond and femtosecond) laser processing. Laser processing of thin of polymers. Laser interaction with liquids. Laser cleaning. Laser interactions with nanoparticles

Mofrad, Mohammad R. K.

371

A Process Management System for Networked Manufacturing  

NASA Astrophysics Data System (ADS)

With the development of computer, communication and network, networked manufacturing has become one of the main manufacturing paradigms in the 21st century. Under the networked manufacturing environment, there exist a large number of cooperative tasks susceptible to alterations, conflicts caused by resources and problems of cost and quality. This increases the complexity of administration. Process management is a technology used to design, enact, control, and analyze networked manufacturing processes. It supports efficient execution, effective management, conflict resolution, cost containment and quality control. In this paper we propose an integrated process management system for networked manufacturing. Requirements of process management are analyzed and architecture of the system is presented. And a process model considering process cost and quality is developed. Finally a case study is provided to explain how the system runs efficiently.

Liu, Tingting; Wang, Huifen; Liu, Linyan

372

A Survey of Selected Document Processing Systems.  

ERIC Educational Resources Information Center

In addition to reviewing the characteristics of document processing systems, this paper pays considerable attention to the description of a system via a feature list approach. The purpose of this report is to present features of the systems in parallel fashion to facilitate comparison so that a potential user may have a basis for evaluation in…

Fong, Elizabeth

373

ECOSTATIC CANE PROCESSING SYSTEM PROTOTYPE PHASE  

EPA Science Inventory

The overall objective of this project was to demonstrate a systems environmental management approach, from field to final product, for the processing of raw cane sugar. Specific sub-systems which were to be developed and demonstrated as part of this systems approach were: (a) har...

374

FAR-TECH's Nanoparticle Plasma Jet System and its Application to Disruptions, Deep Fueling, and Diagnostics  

NASA Astrophysics Data System (ADS)

Hyper-velocity plasma jets have potential applications in tokamaks for disruption mitigation, deep fueling and diagnostics. Pulsed power based solid-state sources and plasma accelerators offer advantages of rapid response and mass delivery at high velocities. Fast response is critical for some disruption mitigation scenario needs, while high velocity is especially important for penetration into tokamak plasma and its confining magnetic field, as in the case of deep fueling. FAR-TECH is developing the capability of producing large-mass hyper-velocity plasma jets. The prototype solid-state source has produced: 1) >8.4 mg of H2 gas only, and 2) >25 mg of H2 and >180 mg of C60 in a H2/C60 gas mixture. Using a coaxial plasma gun coupled to the source, we have successfully demonstrated the acceleration of composite H/C60 plasma jets, with momentum as high as 0.6 g.km/s, and containing an estimated C60 mass of ˜75 mg. We present the status of FAR-TECH's nanoparticle plasma jet system and discuss its application to disruptions, deep fueling, and diagnostics. A new TiH2/C60 solid-state source capable of generating significantly higher quantities of H2 and C60 in <0.5 ms will be discussed.

Thompson, J. R.; Bogatu, I. N.; Galkin, S. A.; Kim, J. S.

2012-10-01

375

High Consequence System Surety process description  

SciTech Connect

This report documents work-in-progress accomplished prior to programmatic changes that negated bringing this effort to conclusion as originally intended. The High Consequence System Surety (HCS{sup 2}) project pulls together a multi-disciplinary team to integrate the elements of surety safety, security, control, reliability and quality--into a new, encompassing process. The benefit of using this process is enhanced surety in the design of a high consequence system through an up-front, designed-in approach. This report describes the integrated, high consequence surety process and includes a hypothetical example to illustrate the process.

Randall, G.T. [comp.

1995-09-01

376

Serum biomarkers reflecting specific tumor tissue remodeling processes are valuable diagnostic tools for lung cancer.  

PubMed

Extracellular matrix (ECM) proteins, such as collagen type I and elastin, and intermediate filament (IMF) proteins, such as vimentin are modified and dysregulated as part of the malignant changes leading to disruption of tissue homeostasis. Noninvasive biomarkers that reflect such changes may have a great potential for cancer. Levels of matrix metalloproteinase (MMP) generated fragments of type I collagen (C1M), of elastin (ELM), and of citrullinated vimentin (VICM) were measured in serum from patients with lung cancer (n = 40), gastrointestinal cancer (n = 25), prostate cancer (n = 14), malignant melanoma (n = 7), chronic obstructive pulmonary disease (COPD) (n = 13), and idiopathic pulmonary fibrosis (IPF) (n = 10), as well as in age-matched controls (n = 33). The area under the receiver operating characteristics (AUROC) was calculated and a diagnostic decision tree generated from specific cutoff values. C1M and VICM were significantly elevated in lung cancer patients as compared with healthy controls (AUROC = 0.98, P < 0.0001) and other cancers (AUROC = 0.83 P < 0.0001). A trend was detected when comparing lung cancer with COPD+IPF. No difference could be seen for ELM. Interestingly, C1M and VICM were able to identify patients with lung cancer with a positive predictive value of 0.9 and an odds ratio of 40 (95% CI = 8.7-186, P < 0.0001). Biomarkers specifically reflecting degradation of collagen type I and citrullinated vimentin are applicable for lung cancer patients. Our data indicate that biomarkers reflecting ECM and IMF protein dysregulation are highly applicable in the lung cancer setting. We speculate that these markers may aid in diagnosing and characterizing patients with lung cancer. PMID:25044252

Willumsen, Nicholas; Bager, Cecilie L; Leeming, Diana J; Smith, Victoria; Christiansen, Claus; Karsdal, Morten A; Dornan, David; Bay-Jensen, Anne-Christine

2014-10-01

377

Demonstration tests of new burner diagnostic system on a 650 MW coal-fired utility boiler  

SciTech Connect

Forney Corporation, MK Engineering (MKE) and NYSEG jointly conducted extensive testing of a new Burner Diagnostic System (BDS) based on analysis of flame turbulence in the burner ignition zone. Tests were conducted on the 700 MW coal-fired unit at NYSEG Kintigh Station with the objective to evaluate the new system`s capabilities and its potential for improvements in combustion efficiency and NO{sub x} reduction. The overall objectives in creating this new product included the following: develop and test a set of advanced algorithms correlating flame signatures with combustion parameters, such as air-fuel ratio, combustion efficiency, flame stability, CO and NO{sub x} emissions; develop a new generation of flame sensors with improved flame detection and burner management capabilities; develop new advanced combustion optimization strategies and systems, and to equip the operator with an effective new tool to improve combustion performance; and evaluate the new system feasibility and to compare the data with results of the NYSEG`s SMG-10 application (which provides precision measurements of coal and primary air flows to each burner).

Khesin, M. [MK Engineering, N. Andover, MA (United States); Quenan, D.; Jesikiewicz, T.; Kenien, D. [NYSEG, Barker, NY (United States); Girvan, R. [Forney Corp., Carrollton, TX (United States)

1997-09-01

378

Remote Forensic Analysis of Process Control Systems  

Microsoft Academic Search

Forensic analysis can help maintain the security of process control systems: identifying the root cause of a system compromise\\u000a or failure is useful for mitigating current and future threats. However, forensic analysis of control systems is complicated\\u000a by three factors. First, live analysis must not impact the performance and functionality of a control system. Second, the\\u000a analysis should be performed

Regis Friend Cassidy; Adrian Chavez; Jason Trent; Jorge Urrea

2007-01-01

379

A laser-spectroscopy system for fluorescent diagnostics and photodynamic therapy of diseases of eye retina and choroid  

SciTech Connect

A laser-spectroscopy system for the fluorescent diagnostics and photodynamic therapy of pathologic eye-fundus changes combined with the use of the Photosens compound is developed. The system is tested on experimental animals (mice and rabbits). (laser biology and medicine)

Meerovich, G A; Shevchik, S A; Loshchenov, M V [Natural Science Center, A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation); Budzinskaya, M V; Ermakova, N A [Helmholtz Moscow Research Institute of Eye Diseases, Moscow (Russian Federation); Kharnas, S S [I.M. Sechenov Moscow Academy of Medicine, Moscow (Russian Federation)

2002-11-30

380

IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 45, NO. 6, JUNE 1998 783 An Automatic Diagnostic System for CT Liver  

E-print Network

System for CT Liver Image Classification E-Liang Chen, Pau-Choo Chung,* Member, IEEE, Ching-Liang Chen been widely used for liver disease diagnosis. Designing and developing computer-assisted image the past years. In this paper, a CT liver image diagnostic classification system is presented which

Chang, Chein-I

381

1062 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 22, NO. 3, MAY 2007 Fault Diagnostic System for a Multilevel  

E-print Network

for a Multilevel Inverter Using a Neural Network Surin Khomfoi, Student Member, IEEE, and Leon M. Tolbert, Senior network is developed. It is difficult to diagnose a multilevel-inverter drive (MLID) system using a math, diagnostics, and detections of a multilevel inverter drive system can be accomplished. The results

Tolbert, Leon M.

382

Systems integration processes for space nuclear electric propulsion systems  

NASA Astrophysics Data System (ADS)

An acount is given of the ways in which processes similar to those employed for the subsystem development and integration tasks for multi-MW space nuclear power system concepts may be applied to nuclear space propulsion systems. These processes encompass determinations of operational and functional requirements at system and subsystem levels, implementing technology evaluations, mission benefits from alternative integrations, the resolution of feasibility issues, and system and subsystem testing.

Olsen, Charles S.; Rice, John W.; Stanley, Marland L.

383

A radar data processing and enhancement system  

NASA Technical Reports Server (NTRS)

This report describes the space position data processing system of the NASA Western Aeronautical Test Range. The system is installed at the Dryden Flight Research Facility of NASA Ames Research Center. This operational radar data system (RADATS) provides simultaneous data processing for multiple data inputs and tracking and antenna pointing outputs while performing real-time monitoring, control, and data enhancement functions. Experience in support of the space shuttle and aeronautical flight research missions is described, as well as the automated calibration and configuration functions of the system.

Anderson, K. F.; Wrin, J. W.; James, R.

1986-01-01

384

Evaluation Methodology for Natural Language Processing Systems.  

National Technical Information Service (NTIS)

The Neal-Montgomery NLP Evaluation Methodology was developed under the 'Benchmark Investigation/Identification' project as a means of determining the linguistic competence of Natural Language Processing (NLP) systems. Embodied in an evaluation tool based ...

C. A. Montgomery, D. J. Funke, E. L. Feit, J. G. Neal

1992-01-01

385

Vehicle Processing Readiness Course: Fluid Systems  

NSDL National Science Digital Library

This document from SpaceTEC National Aerospace Technical Education Center presents a vehicle processing readiness course on fluid systems. Topics include units of measure, definitions, hydraulics and cryogenics.

Fletcher, Bill

2010-10-25

386

Enhanced Sample Processing Devices, Systems and Methods.  

National Technical Information Service (NTIS)

The present invention relates to devices, methods and systems for processing of sample materials, such as methods used to amplify genetic materials, etc. Many different chemical, biochemical, and other reactions are sensitive to temperature variations. Ex...

W. Bedingham, R. Rajagopal, B. W. Robole, K. Seshari

2004-01-01

387

A dynamically reconfigurable data stream processing system  

SciTech Connect

This paper describes a component-based framework for data stream processing that allows for configuration, tailoring, and runtime system reconfiguration. The system's architecture is based on a pipes and filters pattern, where data is passed through routes between components. A network of pipes and filters can be dynamically reconfigured in response to a preplanned sequence of processing steps, operator intervention, or a change in one or more data streams. This framework provides several mechanisms supporting dynamic reconfiguration and can be used to build static data stream processing applications such as monitoring or data acquisition systems, as well as self-adjusting systems that can adapt their processing algorithm, presentation layer, or data persistency layer in response to changes in input data streams.

Nogiec, J.M.; Trombly-Freytag, K.; /Fermilab

2004-11-01

388

Inversion processes in the human visual system  

NASA Astrophysics Data System (ADS)

We present the results of a study of the plausibility of inverting the image analysis done in the human visual system. We examine the arguments for such inversion in recall and visual imagery, and look at the requirements for creating imagery by inverting one or multiple layers of function in neural nets. We then show how such a reversal of visual system processing can take place in stages, or all at once. This is done by means of finite Radon transforms on certain geometries, and we examine the possibility that such situations exist in the human visual system. We create a dual system to certain feed forward network models of visual processing, and show its application to such processing, and to non-image processing applications.

Rising, Hawley K., III

2000-06-01

389

Intestinal pseudo-obstruction in patients with systemic lupus erythematosus: A real diagnostic challenge.  

PubMed

Intestinal pseudo-obstruction secondary to systemic lupus erythematosus (SLE) is a rare syndrome described in recent decades. There are slightly over 30 published cases in the English language literature, primarily associated with renal and hematological disease activity. Its presentation and evolution are a diagnostic challenge for the clinician. We present four cases of intestinal pseudo-obstruction due to lupus in young Mexican females. One patient had a previous diagnosis of SLE and all presented with a urinary tract infection of varying degrees of severity during their evolution. We consider that recognition of the disease is of vital importance because it allows for establishing appropriate management, leading to a better prognosis and avoiding unnecessary surgery and complications. PMID:25170234

García López, Carlos Alberto; Laredo-Sánchez, Fernando; Malagón-Rangel, José; Flores-Padilla, Miguel G; Nellen-Hummel, Haiko

2014-08-28

390

A Full Aperture Backscattering Light Diagnostic System Installed on the Shenguang-III Prototype Laser Facility  

NASA Astrophysics Data System (ADS)

A full aperture backscattering light diagnostic system (FABLDS) implemented on the Shen Guang-III Prototype Laser Facility is described in the paper. FABLDS measures both stimulated brillouin scattering (SBS) and stimulated Raman scattering (SRS) with a series of optical detectors. Energy sensors record the integrated energy, and streak cameras coupled with spectrometers measure the temporal spectrum of the backscattering light. This paper provides an overview of the FABLDS and detailed descriptions of the optical path. Special components, including off-axis parabolic mirror, spatial filter and optical light filters, are incorporated along the beam path for purifying the scattering light. Several hohlraum targets were employed, including C5H12 gas-filled targets and empty targets in the experiments. Results presented in the paper indicate that the fraction of backscatter light has been obviously shrinked when the laser is smoothed by continuous phase plates (CPP).

Xu, Tao; Mei, Yu; Wei, Huiyue; Peng, Xiaoshi; Wang, Feng; Yang, Dong; Liu, Shenye; Yan, Yadong

2014-06-01

391

Intestinal pseudo-obstruction in patients with systemic lupus erythematosus: A real diagnostic challenge  

PubMed Central

Intestinal pseudo-obstruction secondary to systemic lupus erythematosus (SLE) is a rare syndrome described in recent decades. There are slightly over 30 published cases in the English language literature, primarily associated with renal and hematological disease activity. Its presentation and evolution are a diagnostic challenge for the clinician. We present four cases of intestinal pseudo-obstruction due to lupus in young Mexican females. One patient had a previous diagnosis of SLE and all presented with a urinary tract infection of varying degrees of severity during their evolution. We consider that recognition of the disease is of vital importance because it allows for establishing appropriate management, leading to a better prognosis and avoiding unnecessary surgery and complications. PMID:25170234

Garcia Lopez, Carlos Alberto; Laredo-Sanchez, Fernando; Malagon-Rangel, Jose; Flores-Padilla, Miguel G; Nellen-Hummel, Haiko

2014-01-01

392

Use of stratospheric aerosol properties as diagnostics of Antarctic vortex processes  

NASA Technical Reports Server (NTRS)

Physical properties of the stratospheric aerosol population are inferred from cloud-free SAGE II multiwavelength extinction measurements in the Antarctic during late summer (February/March) and spring (September/October, November). Seasonal changes in these properties are used to infer physical processes occurring in the Antarctic stratosphere over the course of the winter. The analysis suggests that the apparent springtime cleansing of the Antarctic stratosphere is the result of aerosol redistribution through subsidence of the polar vortex air mass and sedimentation of large polar stratospheric cloud particles. The analysis also suggests that vortex processes are responsible for a significant downward transport of aerosol through the tropopause.

Thomason, Larry W.; Poole, Lamont R.

1993-01-01

393

Processing and packaging automation systems: a review  

Microsoft Academic Search

Global food processing and packaging business has reached to multi trillion dollars as the consumers have started using processed\\u000a food more than the staples. This paper reviews aspects of systems, standards and interfaces for the modern food industry.\\u000a It presents processing and packaging principles, methods, techniques, standards, interfaces, and state-of-the-art technology.\\u000a The primary purpose of this paper is to update

Nitaigour P. Mahalik

2009-01-01

394

Parallel processing in power systems computation  

Microsoft Academic Search

The availability of parallel processing hardware and software presents an opportunity and a challenge to apply this new computation technology to solve power system problems. The allure of parallel processing is that this technology has the potential to be cost effectively used on computationally intense problems. The objective of this paper is to define the state of the art and

D. J. Tylavsky; A. Bose; F. Alvarado; R. Betancourt; K. Clements; G. T. Heydt; G. Huang; M. Ilic; M. La Scala; M. A. Pai

1992-01-01

395

Optical signal processing in Radar systems  

Microsoft Academic Search

Opto-electronic components and their performances are well suited to be integrated in radar systems. In this paper, two optical architectures illustrate functions that are specific to optical processing of microwave signals, i.e., time-delay-based processing and arbitrary waveform generation of large frequency bandwidth signals.

Sylvie Tonda-Goldstein; Daniel Dolfi; Aymeric Monsterleet; Stéphane Formont; Jean Chazelas; Jean-Pierre Huignard

2006-01-01

396

Interactive data-processing system for metallurgy  

NASA Technical Reports Server (NTRS)

Equipment indicates that system can rapidly and accurately process metallurgical and materials-processing data for wide range of applications. Advantages include increase in contract between areas on image, ability to analyze images via operator-written programs, and space available for storing images.

Rathz, T. J.

1978-01-01

397

COMPUTER DATA PROCESSING SYSTEM. PROJECT ROVER, 1962  

Microsoft Academic Search

ABS>A system was created for processing large volumes of data from ; Project ROVER tests at the Nevada Test Site. The data are compiled as analog, ; frequency modulated tape, which is translated in a Packard-Bell Tape-to-Tape ; converter into a binary coded decimal (BCD) IBM 7090 computer input tape. This ; input tape, tape A5, is processed on the

Narin

1963-01-01

398

An upgrade of the magnetic diagnostic system of the DIII-D tokamak for non-axisymmetric measurements.  

PubMed

The DIII-D tokamak magnetic diagnostic system [E. J. Strait, Rev. Sci. Instrum. 77, 023502 (2006)] has been upgraded to significantly expand the measurement of the plasma response to intrinsic and applied non-axisymmetric "3D" fields. The placement and design of 101 additional sensors allow resolution of toroidal mode numbers 1 ? n ? 3, and poloidal wavelengths smaller than MARS-F, IPEC, and VMEC magnetohydrodynamic model predictions. Small 3D perturbations, relative to the equilibrium field (10(-5) < ?B/B0 < 10(-4)), require sub-millimeter fabrication and installation tolerances. This high precision is achieved using electrical discharge machined components, and alignment techniques employing rotary laser levels and a coordinate measurement machine. A 16-bit data acquisition system is used in conjunction with analog signal-processing to recover non-axisymmetric perturbations. Co-located radial and poloidal field measurements allow up to 14.2 cm spatial resolution of poloidal structures (plasma poloidal circumference is ~500 cm). The function of the new system is verified by comparing the rotating tearing mode structure, measured by 14 BP fluctuation sensors, with that measured by the upgraded B(R) saddle loop sensors after the mode locks to the vessel wall. The result is a nearly identical 2/1 helical eigenstructure in both cases. PMID:25173265

King, J D; Strait, E J; Boivin, R L; Taussig, D; Watkins, M G; Hanson, J M; Logan, N C; Paz-Soldan, C; Pace, D C; Shiraki, D; Lanctot, M J; La Haye, R J; Lao, L L; Battaglia, D J; Sontag, A C; Haskey, S R; Bak, J G

2014-08-01

399

On-line integration of computer controlled diagnostic devices and medical information systems in undergraduate medical physics education for physicians.  

PubMed

We designed and evaluated an innovative computer-aided-learning environment based on the on-line integration of computer controlled medical diagnostic devices and a medical information system for use in the preclinical medical physics education of medical students. Our learning system simulates the actual clinical environment in a hospital or primary care unit. It uses a commercial medical information system for on-line storage and processing of clinical type data acquired during physics laboratory classes. Every student adopts two roles, the role of 'patient' and the role of 'physician'. As a 'physician' the student operates the medical devices to clinically assess 'patient' colleagues and records all results in an electronic 'patient' record. We also introduced an innovative approach to the use of supportive education materials, based on the methods of adaptive e-learning. A survey of student feedback is included and statistically evaluated. The results from the student feedback confirm the positive response of the latter to this novel implementation of medical physics and informatics in preclinical education. This approach not only significantly improves learning of medical physics and informatics skills but has the added advantage that it facilitates students' transition from preclinical to clinical subjects. PMID:22200603

Hanus, Josef; Nosek, Tomas; Zahora, Jiri; Bezrouk, Ales; Masin, Vladimir

2013-01-01

400

Signal processing system in cavity enhanced spectroscopy  

NASA Astrophysics Data System (ADS)

The paper presents a signal processing system used for nitrogen dioxide detection employing cavity enhanced absorption spectroscopy. In this system, the absorbing gas concentration is determined by the measurement of a decay time of a light pulse trapped in a cavity. The setup includes a resonance optical cavity, which was equipped with spherical and high reflectance mirrors, the pulsed diode laser (414 nm) and electronic signal processing system. In order to ensure registration of low-level signals and accurate decay time measurements, special preamplifier and digital signal processing circuit were developed. Theoretical analyses of main parameters of optical cavity and signal processing system were presented and especially signal-to-noise ratio was taken into consideration. Furthermore, investigation of S/N signal processing system and influence of preamplifier feedback resistance on the useful signal distortion were described. The aim of the experiment was to study potential application of cavity enhanced absorption spectroscopy for construction of fully optoelectronic NO2 sensor which could replace, e.g., commonly used chemical detectors. Thanks to the developed signal processing system, detection limit of NO2 sensor reaches the value of 0.2 ppb (absorption coefficient equivalent = 2.8 × 10-9 cm-1).

Wojtas, J.; Bielecki, Z.

2008-12-01

401

Short-Term Memory and Auditory Processing Disorders: Concurrent Validity and Clinical Diagnostic Markers  

ERIC Educational Resources Information Center

Auditory processing disorders (APDs) are of interest to educators and clinicians, as they impact school functioning. Little work has been completed to demonstrate how children with APDs perform on clinical tests. In a series of studies, standard clinical (psychometric) tests from the Wechsler Intelligence Scale for Children, Fourth Edition…

Maerlender, Arthur

2010-01-01

402

Transverse nucleon structure and diagnostics of hard parton-parton processes at LHC  

SciTech Connect

We propose a new method to determine at what transverse momenta particle production in high-energy pp collisions is governed by hard parton-parton processes. Using information on the transverse spatial distribution of partons obtained from hard exclusive processes in ep/\\gamma p scattering, we evaluate the impact parameter distribution of pp collisions with a hard parton-parton process as a function of p_T of the produced parton (jet). We find that the average pp impact parameters in such events depend very weakly on p_T in the range 2 < p_T < few 100 GeV, while they are much smaller than those in minimum-bias inelastic collisions. The impact parameters in turn govern the observable transverse multiplicity in such events (in the direction perpendicular to the trigger particle or jet). Measuring the transverse multiplicity as a function of p_T thus provides an effective tool for determining the minimum p_T for which a given trigger particle originates from a hard parton-parton process.

L. Frankfurt, M. Strikman, C. Weiss

2011-03-01

403

Transverse nucleon structure and diagnostics of hard parton-parton processes at LHC  

SciTech Connect

We propose a new method to determine at what transverse momenta particle production in high-energy pp collisions is governed by hard parton-parton processes. Using information on the transverse spatial distribution of partons obtained from hard exclusive processes in ep/{gamma}p scattering, we evaluate the impact parameter distribution of pp collisions with a hard parton-parton process as a function of p{sub T} of the produced parton (jet). We find that the average pp impact parameters in such events depend very weakly on p{sub T} in the range 2process. Additional tests of the proposed geometric correlations are possible by measuring the dependence on the trigger rapidity. Various strategies for implementing this method are outlined.

Frankfurt, L. [School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv (Israel); Strikman, M. [Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States); Weiss, C. [Theory Center, Jefferson Lab, Newport News, Virginia 23606 (United States)

2011-03-01

404

Modelling and diagnostics of multiple cathodes plasma torch system for plasma spraying  

Microsoft Academic Search

Usage of a multiple-arcs system has significantly improved process stability and coating properties in air plasma spraying.\\u000a However, there are still demands on understanding and controlling the physical process to determine process conditions for\\u000a reproducible coating quality and homogeneity of coating microstructure. The main goal of this work is the application of numerical\\u000a simulation for the prediction of the temperature

Kirsten Bobzin; Nazlim Bagcivan; Lidong Zhao; Ivica Petkovic; Jochen Schein; Karsten Hartz-Behrend; Stefan Kirner; José-Luis Marqués; Günter Forster

2011-01-01

405

Parallel processing in power systems computation  

SciTech Connect

The availability of parallel processing hardware and software presents an opportunity and a challenge to apply this new computation technology to solve power system problems. The allure of parallel processing is that this technology has the potential to be cost effectively used on computationally intense problems. The objective of this paper is to define the state of the art and identify what the authors see to be the most fertile grounds for future research in parallel processing as applied to power system computation. As always, such projections are risky in a fast changing field, but the authors hope that this paper will be useful to the researchers and practitioners in this growing area.

Tylavsky, D.J.; Bose, A.; Alvarado, F.; Betancourt, R.; Clements, K.; Heydt, G.T.; Huang, G.; Ilic, M.; La Scala, M.; Pai, M.A.

1992-05-01

406

Diagnostic procedures for Trend Monitoring System (TMS) communications. [coaxial cable bus system  

NASA Technical Reports Server (NTRS)

A prototype coaxial cable bus communications sytem was developed to support the trend monitoring system (TMS). Troubleshooting procedures are described at the system level. The procedures can be used by repair personnel to isolate a fault in the TMS and to restore the system to operation by swapping out failed components.

Brown, J. S.; Lenker, M. D.

1979-01-01

407

Performance evaluation system of signal processing algorithms  

Microsoft Academic Search

Signal processing algorithms (SPA) play a key role in an imaging IR tracker which is widely used in infrared search and track (IRST) system. When being used to target detection, recognition and tracking, SPA has a significant influence on the performance of the IRST system. Due to the variety and complexity of field scenes and countermeasures, SPA should be robust

Shike Huang; Lijuan Li; Baoguo Chen; Zhenyu Wang

2001-01-01

408

Quantum information processing in mesoscopic systems  

E-print Network

introduce the Quantum Dots as the solid state system that will primarily be used as the hardware of quantum computation in quantum dots is described. The principal sources of decoherence and the measurementQuantum information processing in mesoscopic systems Jose Luis Garcia Coello A dissertation

Guillas, Serge

409

ETHICS AND REFLECTING PROCESSES: A SYSTEMIC PERSPECTIVE  

Microsoft Academic Search

This paper begins with the premise that the therapeutic space occupied by social work straddles both systemic and psychodynamic perspectives and therefore that social work has been ill?served by the traditional oppositionality between the two orientations. The systemic perspective on reflecting teams and processes is the primary focus and this is discussed in terms of intersections with themes in social

Mary Donovan

2007-01-01

410

Aligning Legacy Information Systems to Business Processes  

Microsoft Academic Search

Recent years have experienced a growth in demand for re- engineering legacy information systems. The complexity of a development endeavour leading to migration of a legacy system stresses the need for a systematic supporting approach. We argue in this paper that such an approach should facilitate (a) documentation of dependenci es between business processes and supporting IS in a way

Panos Kardasis; Pericles Loucopoulos

1998-01-01

411

General Information Processing System: (GIPSY). Application Description.  

ERIC Educational Resources Information Center

The application description is directed to those desiring to acquaint themselves with the characteristics of the General Information Processing System (GIPSY). It provides guidelines and aids for the preparation and use of the system, and covers such areas as: (1) Information Collection and Creation, (2) Information Retrieval, (3) Maintenance…

Addison, Charles H.; And Others

412

Development of a new photon diffraction imaging system for diagnostic nuclear medicine  

NASA Astrophysics Data System (ADS)

The objective of this project is to develop and construct an innovative imaging system for nuclear medicine and molecular imaging that uses photon diffraction and is capable of generating 1 2 mm spatial resolution images in two or three dimensions. The proposed imaging system would be capable of detecting radiopharmaceuticals that emit 100 200 keV gamma rays which are typically used in diagnostic nuclear medicine and in molecular imaging. The system is expected to be optimized for the 140.6 keV gamma ray from a Tc-99m source, which is frequently used in nuclear medicine. This new system will focus the incoming gamma rays in a manner analogous to a magnifying glass focusing sunlight into a small focal point on a detector's sensitive area. Focusing gamma rays through photon diffraction has already been demonstrated with the construction of a diffraction lens telescope for astrophysics and a scaled-down lens for medical imaging, both developed at Argonne National Laboratory (ANL). In addition, spatial resolutions of 3 mm have been achieved with a prototype medical lens. The proposed imaging system would be comprised of an array of photon diffraction lenses tuned to diffract a specific gamma ray energy (within 100 200 keV) emitted by a common source. The properties of photon diffraction make it possible to diffract only one specific gamma ray energy at a time, which significantly reduces scattering background. The system should be sufficiently sensitive to the detection of small concentrations of radioactivity that can reveal potential tumor sites at their initial stages of development. Moreover, the system's sensitivity would eliminate the need for re-injecting a patient with more radiopharmaceutical if this patient underwent a prior nuclear imaging scan. Detection of a tumor site at its inception could allow for an earlier initiation of treatment and wider treatment options, which can potentially improve the chances for cure.

Roa, D. E.; Smither, R. K.; Zhang, X.; Nie, K.; Shieh, Y. Y.; Ramsinghani, N. S.; Milne, N.; Kuo, J. V.; Redpath, J. L.; Al-Ghazi, M. S. A. L.; Caligiuri, P.

2005-12-01

413

Use of stratospheric aerosol properties as diagnostics of Antarctic vortex processes  

SciTech Connect

Physical properties of the stratospheric aerosol population are inferred from cloud-free SAGE II multiwavelength extinction measurements in the Antarctic during late summer (February/March) and spring (September/October, November). Seasonal changes in these properties are used to infer physical processes occurring in the Antarctic stratosphere over the course of the winter. The analysis suggests that the apparent springtime cleansing of the Antarctic stratosphere is the result of aerosol redistribution through subsidence of the polar vortex air mass and sedimentation of large polar stratospheric cloud particles. The analysis also suggests that vortex processes are responsible for a significant downward transport of aerosol through the tropopause. 44 refs., 7 figs., 1 tab.

Thomason, L.W.; Poole, L.R. [NASA Langley Research Center, Hampton, VA (United States)

1993-12-20

414

ASPEN. Advanced System for Process Engineering  

SciTech Connect

ASPEN (Advanced System for Process Engineering) is a state of the art process simulator and economic evaluation package which was designed for use in engineering fossil energy conversion processes. ASPEN can represent multiphase streams including solids, and handle complex substances such as coal. The system can perform steady state material and energy balances, determine equipment size and cost, and carry out preliminary economic evaluations. It is supported by a comprehensive physical property system for computation of major properties such as enthalpy, entropy, free energy, molar volume, equilibrium ratio, fugacity coefficient, viscosity, thermal conductivity, and diffusion coefficient for specified phase conditions; vapor, liquid, or solid. The properties may be computed for pure components, mixtures, or components in a mixture, as appropriate. The ASPEN Input Language is oriented towards process engineers.

Bajura, R.A. [USDOE Morgantown Energy Technology Center, WV (United States)

1985-10-01

415

Hypereosinophilia: A Diagnostic Dilemma  

PubMed Central

A case of hypereosinophilia is presented. The case illustrates the complexity of the diagnostic processes in certain conditions like hypereosinophilia. Keywords Hypereosinophilia; Myocarditis; Stroke PMID:21629546

Rehman, Habib Ur

2010-01-01

416

Using the GRADE system in diagnostic strategy: the case of antiphospholipid syndrome.  

PubMed

Diagnostic strategy studies commonly focus on the accuracy of tests in diagnosing, and grading this body of evidence is a challenge in itself because (1) standard tools for grading evidence were designed for questions about treatment rather than diagnostic testing; and (2) the clinical usefulness of a diagnostic strategy depends on multiple links in a chain of evidence connecting the performance of a test to changes in clinical outcomes. The application of the GRADE approach requires a shift in clinicians' thinking to clearly recognize that, whatever their accuracy, diagnostic tests are valuable only if they result in improved outcomes for patients. PMID:25228730

de Abreu, M Mendes; Levy, Ra; Wahl, D

2014-10-01

417

Energy management systems as diagnostic tools for building managers and energy auditors  

SciTech Connect

Current energy management systems have an underutilized capability to store and analyze information in a form useful for energy audits and ongoing performance monitoring of HVAC equipment. This paper discusses features that could be added to an energy management system to carry out these functions. The potential benefit of such features is evaluated, based on our experience with a pair of instrumented office buildings. For hardware, this involves instrumentation to monitor electric power, water flows, airflows, and temperatures. For software, graphical displays would be an excellent tool for establishing daily, weekly, and seasonal patterns. The authors show a sample format for such data that has turned out to be very instructive. The authors also emphasize the usefulness of a plot of daily energy consumption versus ambient temperature. Another useful feature would be an algorithm based on past measured data that would predict the energy consumption for the current occupancy status and weather conditions. A further development would be the integration of these features into an expert system. The authors illustrate these points with data from buildings and show how much energy consumption and/or comfort conditions have been improved as a result of some of these diagnostic tools.

Norford, L.K.; Rabl, A.; Spadaro, G.V.

1987-06-01

418

Waste receiving and processing plant control system; system design description  

SciTech Connect

The Plant Control System (PCS) is a heterogeneous computer system composed of numerous sub-systems. The PCS represents every major computer system that is used to support operation of the Waste Receiving and Processing (WRAP) facility. This document, the System Design Description (PCS SDD), includes several chapters and appendices. Each chapter is devoted to a separate PCS sub-system. Typically, each chapter includes an overview description of the system, a list of associated documents related to operation of that system, and a detailed description of relevant system features. Each appendice provides configuration information for selected PCS sub-systems. The appendices are designed as separate sections to assist in maintaining this document due to frequent changes in system configurations. This document is intended to serve as the primary reference for configuration of PCS computer systems. The use of this document is further described in the WRAP System Configuration Management Plan, WMH-350, Section 4.1.

LANE, M.P.

1999-02-24

419

Wireless Infrastructure for Performing Monitoring, Diagnostics, and Control HVAC and Other Energy-Using Systems in Small Commercial Buildings  

SciTech Connect

This project focused on developing a low-cost wireless infrastructure for monitoring, diagnosing, and controlling building systems and equipment. End users receive information via the Internet and need only a web browser and Internet connection. The system used wireless communications for: (1) collecting data centrally on site from many wireless sensors installed on building equipment, (2) transmitting control signals to actuators and (3) transmitting data to an offsite network operations center where it is processed and made available to clients on the Web (see Figure 1). Although this wireless infrastructure can be applied to any building system, it was tested on two representative applications: (1) monitoring and diagnostics for packaged rooftop HVAC units used widely on small commercial buildings and (2) continuous diagnosis and control of scheduling errors such as lights and equipment left on during unoccupied hours. This project developed a generic infrastructure for performance monitoring, diagnostics, and control, applicable to a broad range of building systems and equipment, but targeted specifically to small to medium commercial buildings (an underserved market segment). The proposed solution is based on two wireless technologies. The first, wireless telemetry, is used for cell phones and paging and is reliable and widely available. This risk proved to be easily managed during the project. The second technology is on-site wireless communication for acquiring data from sensors and transmitting control signals. The technology must enable communication with many nodes, overcome physical obstructions, operate in environments with other electrical equipment, support operation with on-board power (instead of line power) for some applications, operate at low transmission power in license-free radio bands, and be low cost. We proposed wireless mesh networking to meet these needs. This technology is relatively new and has been applied only in research and tests. This proved to be a major challenge for the project and was ultimately abandoned in favor of a directly wired solution for collecting sensor data at the building. The primary reason for this was the relatively short ranges at which we were able to effectively place the sensor nodes from the central receiving unit. Several different mesh technologies were attempted with similar results. Two hardware devices were created during the original performance period of the project. The first device, the WEB-MC, is a master control unit that has two radios, a CPU, memory, and serves as the central communications device for the WEB-MC System (Currently called the 'BEST Wireless HVAC Maintenance System' as a tentative commercial product name). The WEB-MC communicates with the local mesh network system via one of its antennas. Communication with the mesh network enables the WEB-MC to configure the network, send/receive data from individual motes, and serves as the primary mechanism for collecting sensor data at remote locations. The second antenna enables the WEB-MC to connect to a cellular network ('Long-Haul Communications') to transfer data to and from the NorthWrite Network Operations Center (NOC). A third 'all-in-one' hardware solution was created after the project was extended (Phase 2) and additional resources were provided. The project team leveraged a project funded by the State of Washington to develop a hardware solution that integrated the functionality of the original two devices. The primary reason for this approach was to eliminate the mesh network technical difficulties that severely limited the functionality of the original hardware approach. There were five separate software developments required to deliver the functionality needed for this project. These include the Data Server (or Network Operations Center), Web Application, Diagnostic Software, WEB-MC Embedded Software, Mote Embedded Software. Each of these developments was necessarily dependent on the others. This resulted in a challenging management task - requiring high bandwidth communications among

Patrick O'Neill

2009-06-30

420

Process diagnostics and non-destructive testing using high-resolution gamma-ray tomography  

Microsoft Academic Search

In this paper, a high-resolution gamma-ray computed tomography (CT) measurement system is presented that was developed to determine phase fractions and other flow parameters in industrial devices operated under real industrial conditions. From CT scans non-superimposed cross-sectional images are reconstructed, which show the local gamma-ray attenuation coefficients within the scanned object slice. An advanced fast read-out electronics facilitates 2-D visualization

André Bieberle; Dietrich Hoppe; Uwe Hampel

2010-01-01

421

Modeling and Estimating Recall Processing Capacity: Sensitivity and Diagnostic Utility in Application to Mild Cognitive Impairment  

PubMed Central

We investigate the potential for using latency-based measures of retrieval processing capacity to assess changes in perfomance specific to individuals with mild cognitive impairment (MCI), a reliable precursor state to Alzheimer's Disease. Use of these capacity measures is motivated in part by exploration of the effects of atrophy on a computational model of a basic hippocampal circuit. We use this model to suggest that capacity may be a more sensitive indicator of undelying atrophy than speed of processing, and test this hypothesis by adapting a standard behavioral measure of memory (the free and cued selective reminding test, FCSRT) to allow for the collection of cued recall latencies. Participants were drawn from five groups: college-aged, middle-aged, healthy elderly, those with a diagnosis of MCI, and a sample of MCI control participants. The measure of capacity is shown to offer increased classificatory sensitivity relative to the standard behavioral measures, and is also shown to be the behavioral measure that correlated most strongly with hippocampal volume. PMID:20436932

Wenger, Michael K.; Negash, Selamawit; Petersen, Ronald C.; Petersen, Lyndsay

2009-01-01

422

Missouri automated radiology system: A dynamic, interactive diagnostic and management system for radiant images  

Microsoft Academic Search

Missouri Automated Radiology System has functioned in full support of the Department of Radiology for more than 7 years. For the past 5 years, MARS has functioned as a minicomputer system on a DEC (Digital Equipment Corporation) PDP-15 computer. While continuing to effectively support the department, in daily use by 20 staff and 15 resident physicians, MARS has continued to

Gwilym S. Lodwick; Richard J. Tully; Carroll R. Markivee; B. R. Hakimi; Fred J. Dittrich

1977-01-01

423

An ecological process model of systems change.  

PubMed

In June 2007 the American Journal of Community Psychology published a special issue focused on theories, methods and interventions for systems change which included calls from the editors and authors for theoretical advancement in this field. We propose a conceptual model of systems change that integrates familiar and fundamental community psychology principles (succession, interdependence, cycling of resources, adaptation) and accentuates a process orientation. To situate our framework we offer a definition of systems change and a brief review of the ecological perspective and principles. The Ecological Process Model of Systems Change is depicted, described and applied to a case example of policy driven systems level change in publicly funded social programs. We conclude by identifying salient implications for thinking and action which flow from the Model. PMID:21203829

Peirson, Leslea J; Boydell, Katherine M; Ferguson, H Bruce; Ferris, Lorraine E

2011-06-01

424

Diagnostic improvement based on image processing in low extremities inflamation scintigraphy  

NASA Astrophysics Data System (ADS)

The purpose of this study is the improvement in evaluation of the inflammation extent on the scintigraphic imaging, by utilizing statistical indices (Inflammation Projection Ratio - IPR, skewness, kurtosis and Mean Pixel Value - MPV). Image analysis was performed by means of an Interactive Data Language (IDL) tool. Twelve patients were referred for a radionuclide (Tc99m- Leukoscan) scan, by a GE Healthcare gamma camera, on the suspicion of an infectious lesion in the extremities. The findings of the study are that pathological tissues have a higher IPR index (3.12 to 4.32) compared to normal tissue (~ 1). Furthermore, MPV, skewness and kurtosis differ significantly (> 5%) from normal to inflammable extremities. As a conclusion, image processing provides effective information in the structure and facilitates diagnosis semi-quantitatively.

Lyra, M.; Kordolaimi, S.; Salvara, A. L.

2011-09-01

425

Fault Diagnosis for Power Electronic System Based on Diagnostic Reasoning Model Ensembles  

Microsoft Academic Search

In this paper, we propose a general framework for designing diagnostic reasoning model ensembles(DRME) by means of cooperative coevolution. The proposed model has two main objectives: first, the improvement of the combination of the trained individual diagnostic reasoning model; second, the cooperative evolution of such DRME by encouraging collaboration among them instead of a separate training of each DRM. In

Youping Fan; Xiaoguang Yang; Xiwei Zai; Xiaoxia Zhou

2009-01-01

426

Fuels processing for transportation fuel cell systems  

SciTech Connect

Fuel cells primarily use hydrogen as the fuel. This hydrogen must be produced from other fuels such as natural gas or methanol. The fuel processor requirements are affected by the fuel to be converted, the type of fuel cell to be supplied, and the fuel cell application. The conventional fuel processing technology has been reexamined to determine how it must be adapted for use in demanding applications such as transportation. The two major fuel conversion processes are steam reforming and partial oxidation reforming. The former is established practice for stationary applications; the latter offers certain advantages for mobile systems and is presently in various stages of development. This paper discusses these fuel processing technologies and the more recent developments for fuel cell systems used in transportation. The need for new materials in fuels processing, particularly in the area of reforming catalysis and hydrogen purification, is discussed.

Kumar, R.; Ahmed, S.

1995-07-01

427

Spacelab output processing system architectural study  

NASA Technical Reports Server (NTRS)

Two different system architectures are presented. The two architectures are derived from two different data flows within the Spacelab Output Processing System. The major differences between these system architectures are in the position of the decommutation function (the first architecture performs decommutation in the latter half of the system and the second architecture performs that function in the front end of the system). In order to be examined, the system was divided into five stand-alone subsystems; Work Assembler, Mass Storage System, Output Processor, Peripheral Pool, and Resource Monitor. The work load of each subsystem was estimated independent of the specific devices to be used. The candidate devices were surveyed from a wide sampling of off-the-shelf devices. Analytical expressions were developed to quantify the projected workload in conjunction with typical devices which would adequately handle the subsystem tasks. All of the study efforts were then directed toward preparing performance and cost curves for each architecture subsystem.

1977-01-01

428

Spectroscopic second harmonic generation as a diagnostic tool in silicon materials processing  

NASA Astrophysics Data System (ADS)

Spectroscopic second harmonic generation (SHG) has been applied to study thin layers of amorphous silicon in the second harmonic photon energy range of 2.7-3.5 eV. The layers were synthesized by hot-wire CVD of hydrogenated amorphous silicon (a-Si : H) and by Ar+ ion bombardment of crystalline silicon (c-Si). For a-Si : H a broad feature has been observed in the SHG spectrum. It is discussed that the SHG signal originates from strained Si-Si bonds in the surface or interface region of the a-Si : H film. For H-terminated Si(100) both in spectroscopic and real-time experiments the SHG signal increases by an order of magnitude upon bombardment with 70 eV Ar+ ions. We argue that the SHG signal from the amorphized Si layer is generated mainly at the buried interface with c-Si, while an additional contribution seems to originate from the amorphous Si surface region. From the combination of spectroscopic and real-time SHG studies insight into the role of strained bonds in the growth and etching processes of silicon can be gained.

Gielis, J. J. H.; Stevens, A. A. E.; Gevers, P. M.; Beijerinck, H. C. W.; van de Sanden, M. C. M.; Kessels, W. M. M.

2005-12-01

429

Diagnostics of the Heating Processes in Solar Flares Using Chromospheric Spectral Lines  

E-print Network

We have calculated the H$\\alpha$ and Ca {\\sc ii} 8542 {\\AA} line profiles based on four different atmospheric models, including the effects of nonthermal electron beams with various energy fluxes. These two lines have different responses to thermal and nonthermal effects, and can be used to diagnose the thermal and nonthermal heating processes. We apply our method to an X-class flare that occurred on 2001 October 19. We are able to identify quantitatively the heating effects during the flare eruption. We find that the nonthermal effects at the outer edge of the flare ribbon are more notable than that at the inner edge, while the temperature at the inner edge seems higher. On the other hand, the results show that nonthermal effects increase rapidly in the rise phase and decrease quickly in the decay phase, but the atmospheric temperature can still keep relatively high for some time after getting to its maximum. For the two kernels that we analyze, the maximum energy fluxes of the electron beams are $\\sim$ 10$^{10}$ and 10$^{11}$ ergs cm$^{-2}$ s$^{-1}$, respectively. However, the atmospheric temperatures are not so high, i.e., lower than or slightly higher than that of the weak flare model F1 at the two kernels. We discuss the implications of the results for two-ribbon flare models.

J. X. Cheng; M. D. Ding; J. P. Li

2006-09-25

430

Utilizing Geographic Information Systems (GIS) to Influence State Policy: A new descriptive, diagnostic, and analytical tool for higher education research  

Microsoft Academic Search

Abstract The purpose of this paper is to examine the utility of Geographic Information Systems (GIS) as a descriptive, diagnostic and analytical tool in higher education research and public policy development. In this paper GIS and how it has been used as a research tool in higher education and other disciplines is described, and a state level example of how

Nathan Daun-Barnett; Britany Affolter-Caine

2005-01-01

431

Algorithms for the Control of NTM by Localized ECRH. Principles and Requirements of the Real Time Diagnostic and Control System  

SciTech Connect

The diagnostics requirements for the control of NTM instabilities is outlined stressing the importance of correctly managing the estimate uncertainty by the control system. A methodology for the Bayesian assimilation of model predictions and observations is outlined together with an example of application.

D' Antona, G. [Politecnico di Milano - Dip. di Elettrotecnica - P.za L. da Vinci, 32--20133 Milano (Italy); Cirant, S.; Farina, D.; Gandini, F.; Lazzaro, E. [Istituto di Fisica del Plasma-Ass. CNR-ENEA-EURATOM-Via Cozzi 53--20125 Milano (Italy); Treuterer, W.; Manini, A. [Max Plack Institut fuer Plasmaphysik-Boltzmannstrasse 2 - D-85748 Garching (Germany)

2008-03-12