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1

Diagnostic Evaluation of Speech Processing Systems.  

National Technical Information Service (NTIS)

The report presents the results of a survey in which the Diagnostic Rhyme Test was used to evaluate the present state of digital technique for speech processing and communication. Also presented are the results of a series of minor studies concerned with ...

W. D. Voiers

1968-01-01

2

System 3 diagnostic process: the lateral approach  

PubMed Central

The process of obtaining diagnosis is described as a dual-process model, including the intuitive process, and the analytical process. The similarity between the two systems is that they both infer a diagnosis from patient-derived information. Here we present another process by which to elicit the diagnosis: asking direct questions of the patient themselves, such as “What do you think is the cause?” or “What do you suspect is wrong?” This simple method would enable us to elicit pivotal information for diagnosis. Asking patients direct questions allows them to think about the cause of their own problem and suggest their own diagnosis. This method of reasoning is completely different from the two above-mentioned systems and may represent a third approach. We highlight this third process as an important strategy, thereby using this third effective method of inquiry to facilitate quick and effective diagnosis in conjunction with former two systems.

Shimizu, Taro; Tokuda, Yasuharu

2012-01-01

3

Analyzing manufacturing processes to determine the placement of diagnostic systems  

Microsoft Academic Search

A method is presented for effectively placing diagnostic systems. The method has two components, the strategic planning component, consisting of a set of rules that analyze a given manufacturing process and identify where to install diagnostic systems, and tactical planning, composed of a set guidelines for evaluating the recommendations made by the strategic planning component. The focus is on strategic

S. B. Dolins

1992-01-01

4

An Integrated Diagnostic Process for Automotive Systems  

Microsoft Academic Search

The increased complexity and integration of vehicle systems has resulted in greater difficulty in the identification of malfunction\\u000a phenomena, especially those related to cross-subsystem failure propagation and thus made system monitoring an inevitable component\\u000a of future vehicles. Consequently, a continuous monitoring and early warning capability that detects, isolates and estimates\\u000a size or severity of faults (viz., fault detection and diagnosis),

Krishna R. Pattipati; Anuradha Kodali; Jianhui Luo; Kihoon Choi; Satnam Singh; Chaitanya Sankavaram; Suvasri Mandal; William Donat; Setu Madhavi Namburu; Shunsuke Chigusa; Liu Qiao

2008-01-01

5

Dual Processing and Diagnostic Errors  

ERIC Educational Resources Information Center

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

Norman, Geoff

2009-01-01

6

Improved Signal Processing Technique Leads to More Robust Self Diagnostic Accelerometer System  

NASA Technical Reports Server (NTRS)

The self diagnostic accelerometer (SDA) is a sensor system designed to actively monitor the health of an accelerometer. In this case an accelerometer is considered healthy if it can be determined that it is operating correctly and its measurements may be relied upon. The SDA system accomplishes this by actively monitoring the accelerometer for a variety of failure conditions including accelerometer structural damage, an electrical open circuit, and most importantly accelerometer detachment. In recent testing of the SDA system in emulated engine operating conditions it has been found that a more robust signal processing technique was necessary. An improved accelerometer diagnostic technique and test results of the SDA system utilizing this technique are presented here. Furthermore, the real time, autonomous capability of the SDA system to concurrently compensate for effects from real operating conditions such as temperature changes and mechanical noise, while monitoring the condition of the accelerometer health and attachment, will be demonstrated.

Tokars, Roger; Lekki, John; Jaros, Dave; Riggs, Terrence; Evans, Kenneth P.

2010-01-01

7

Data processing and analysis of the imaging Thomson scattering diagnostic system on HT-7 tokamak.  

PubMed

A high spatial resolution imaging Thomson scattering diagnostic system was developed in ASIPP (Institute of Plasma Physics, Chinese Academy of Sciences). After about one month trial running on the superconducting HT-7 (Hefei Tokamak-7) tokamak, the system was proved to be capable of measuring plasma electron temperature. The system setup and data calibration are described in this paper and then the instrument function is studied in detail, as well as the measurement capability, an electron temperature of 50 eV to 2 keV and density beyond 1 × 10(19) m(-3). Finally, the data processing method and experimental results are presented. PMID:23742546

Han, Xiaofeng; Shao, Chunqiang; Xi, Xiaoqi; Zhao, Junyu; Qing, Zang; Yang, Jianhua; Dai, Xingxing; Kado, Shinichiro

2013-05-01

8

Data processing and analysis of the imaging Thomson scattering diagnostic system on HT-7 tokamak  

NASA Astrophysics Data System (ADS)

A high spatial resolution imaging Thomson scattering diagnostic system was developed in ASIPP (Institute of Plasma Physics, Chinese Academy of Sciences). After about one month trial running on the superconducting HT-7 (Hefei Tokamak-7) tokamak, the system was proved to be capable of measuring plasma electron temperature. The system setup and data calibration are described in this paper and then the instrument function is studied in detail, as well as the measurement capability, an electron temperature of 50 eV to 2 keV and density beyond 1 × 1019 m-3. Finally, the data processing method and experimental results are presented.

Han, Xiaofeng; Shao, Chunqiang; Xi, Xiaoqi; Zhao, Junyu; Qing, Zang; Yang, Jianhua; Dai, Xingxing; Shinichiro, Kado

2013-05-01

9

Improved diagnostics for future systems  

NASA Astrophysics Data System (ADS)

The need for the incorporation of diagnostic design automation into the weapon system design process and the integration of diagnostic capabilities into field maintenance is examined. The current design processes produce systems that are too expensive to operate, support, and maintain. The problems encountered in performing diagnostics on these complex weapon systems are described. The development of a system which will allow engineers involved in requirements analysis, design, documentation, fabrication, and support to work as an integrated team is discussed.

Nunn, M. E.

1986-05-01

10

The utility of an online diagnostic decision support system (Isabel) in general practice: a process evaluation  

PubMed Central

Objectives To evaluate the utility of Isabel, an online diagnostic decision support system developed by Isabel Healthcare primarily for secondary medical care, in the general practice setting. Design Focus groups were conducted with clinicians to understand why and how they used the system. A modified online post-use survey asked practitioners about its impact on their decision-making. Normalization process theory (NPT) was used as a theoretical framework to determine whether the system could be incorporated into routine clinical practice. Setting The system was introduced by NHS County Durham and Darlington in the UK in selected general practices as a three-month pilot. Participants General practitioners and nurse practitioners who had access to Isabel as part of the Primary Care Trust's pilot. Main outcome measures General practitioners’ views, experiences and usage of the system. Results Seven general practices agreed to pilot Isabel. Two practices did not subsequently use it. The remaining five practices conducted searches on 16 patients. Post-use surveys (n = 10) indicated that Isabel had little impact on diagnostic decision-making. Focus group participants stated that, although the diagnoses produced by Isabel in general did not have an impact on their decision-making, they would find the tool useful if it were better tailored to the primary care setting. Our analysis concluded that normalization was not likely to occur in its current form. Conclusions Isabel was of limited utility in this short pilot study and may need further modification for use in general practice.

Henderson, Emily J; Rubin, Greg P

2013-01-01

11

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

12

Nanoscale laser processing and diagnostics  

NASA Astrophysics Data System (ADS)

The article summarizes research activities of the Laser Thermal Laboratory on pulsed nanosecond and femtosecond laser-based processing of materials and diagnostics at the nanoscale using optical-near-field processing. Both apertureless and apertured near-field probes can deliver highly confined irradiation at sufficiently high intensities to impart morphological and structural changes in materials at the nanometric level. Processing examples include nanoscale selective subtractive (ablation), additive (chemical vapor deposition), crystallization, and electric, magnetic activation. In the context of nanoscale diagnostics, optical-near-field-ablation-induced plasma emission was utilized for chemical species analysis by laser-induced breakdown spectroscopy. Furthermore, optical-near-field irradiation greatly improved sensitivity and reliability of electrical conductance atomic force microscopy enabling characterization of electron tunneling through the oxide shell on silicon nanowires. Efficient in-situ monitoring greatly benefits optical-near-field processing. Due to close proximity of the probe tip with respect to the sample under processing, frequent degradation of the probe end occurs leading to unstable processing conditions. Optical-fiber-based probes have been coupled to a dual-beam (scanning electron microscopy and focused ion beam) system in order to achieve in-situ monitoring and probe repair.

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

2009-08-01

13

Improved Signal Processing Technique Leads to More Robust Self Diagnostic Accelerometer System.  

National Technical Information Service (NTIS)

The self diagnostic accelerometer (SDA) is a sensor system designed to actively monitor the health of an accelerometer. In this case an accelerometer is considered healthy if it can be determined that it is operating correctly and its measurements may be ...

D. Jaros J. Lekki K. P. Evans R. Tokars T. Riggs

2010-01-01

14

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

15

Performance assessment and adoption processes of an information monitoring and diagnostic system prototype  

SciTech Connect

This report addresses the problem that buildings do not perform as well as anticipated during design. We partnered with an innovative building operator to evaluate a prototype Information Monitoring and Diagnostic System (IMDS). The IMDS consists of high-quality measurements archived each minute, a data visualization tool, and a web-based capability. The operators recommend similar technology be adopted in other buildings. The IMDS has been used to identify and correct a series of control problems. It has also allowed the operators to make more effective use of the building control system, freeing up time to take care of other tenant needs. They believe they have significantly improved building comfort, potentially improving tenant health, and productivity. The reduction in hours to operate the building are worth about $20,000 per year, which could pay for the IMDS in about five years. A control system retrofit based on findings from the IMDS is expected to reduce energy use by 20 percent over the next year, worth over $30,000 per year. The main conclusion of the model-based chiller fault detection work is that steady-state models can be used as reference models to monitor chiller operation and detect faults. The ability of the IMDS to measure cooling load and chiller power to one-percent accuracy with a one-minute sampling interval permits detection of additional faults. Evolutionary programming techniques were also evaluated, showing promise in the detection of patterns in building data. We also evaluated two technology adoption processes, radical and routine. In routine adoption, managers enhance features of existing products that are already well understood. In radical adoption, innovative building managers introduce novel technology into their organizations without using the rigorous payback criteria used in routine innovations.

Piette, Mary Ann

1999-10-01

16

Avionics Diagnostic System (ADS).  

National Technical Information Service (NTIS)

The presentation will provide system design including a description of the commands, outputs and diagnostic capabilities provided by the ADS we created. Issues and decisions will also be described as will thoughts on potential new features that could be a...

T. Risko

1999-01-01

17

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

18

A macro-ergonomic work system analysis of the diagnostic testing process in an outpatient health care facility for process improvement and patient safety.  

PubMed

The diagnosis of illness is important for quality patient care and patient safety and is greatly aided by diagnostic testing. For diagnostic tests, such as pathology and radiology, to positively impact patient care, the tests must be processed and the physician and patient must be notified of the results in a timely fashion. There are many steps in the diagnostic testing process, from ordering to result dissemination, where the process can break down and therefore delay patient care and reduce patient safety. This study was carried out to examine the diagnostic testing process (i.e. from ordering to result notification) and used a macro-ergonomic work system analysis to uncover system design flaws that contributed to delayed physician and patient notification of results. The study was carried out in a large urban outpatient health-care facility made up of 30 outpatient clinics. Results indicated a number of variances that contributed to delays, the majority of which occurred across the boundaries of different systems and were related to poor or absent feedback structures. Recommendations for improvements are discussed. PMID:16723328

Hallock, M L; Alper, S J; Karsh, B

19

New detection system and signal processing for the tokamak ISTTOK heavy ion beam diagnostic  

SciTech Connect

The tokamak ISTTOK heavy ion beam diagnostic (HIBD) operates with a multiple cell array detector (MCAD) that allows for the plasma density and the plasma density fluctuations measurements simultaneously at different sampling volumes across the plasma. To improve the capability of the plasma density fluctuations investigations, a new detection system and new signal conditioning amplifier have been designed and tested. The improvements in MCAD design are presented which allow for nearly complete suppression of the spurious plasma background signal by applying a biasing potential onto special electrodes incorporated into MCAD. The new low cost and small size transimpedance amplifiers are described with the parameters of 400 kHz, 10{sup 7} V/A, 0.4 nA of RMS noise, adequate for the plasma density fluctuations measurements.

Henriques, R. B.; Nedzelskiy, I. S.; Malaquias, A.; Fernandes, H. [Associacao Euratom/IST, Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, 1049-001 Lisboa (Portugal)

2012-10-15

20

Adaptive Diagnostic System Project.  

National Technical Information Service (NTIS)

The Adaptive Diagnostic System (ADS) Project sought to integrate state-of-the-art, off-the-shelf hardware and software components with custom-deigned software and hardware interfaces to provide a cost-effective general testing platform for use at the San ...

S. Mullerheim

1998-01-01

21

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

22

Diagnostic enhancements for plasma processing  

SciTech Connect

This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). Funds obtained under this project were used to enhance the diagnostic capabilities of the plasma-processing program in the Physics Division at LANL and include successful development and implementation of in-situ Raman spectroscopy and infrared emission spectroscopy. These methods were used to detect the presence and nature of ground-state and electronically excited molecular oxygen formed in an atmospheric-pressure, nonthermal plasma source used for environmental, industrial and decontamination applications.

Selwyn, G.S.; Henins, I.

1998-12-31

23

Signal processing in ultrasound. [for diagnostic medicine  

NASA Technical Reports Server (NTRS)

Signal is the term used to denote the characteristic in the time or frequency domain of the probing energy of the system. Processing of this signal in diagnostic ultrasound occurs as the signal travels through the ultrasonic and electrical sections of the apparatus. The paper discusses current signal processing methods, postreception processing, display devices, real-time imaging, and quantitative measurements in noninvasive cardiology. The possibility of using deconvolution in a single transducer system is examined, and some future developments using digital techniques are outlined.

Le Croissette, D. H.; Gammell, P. M.

1978-01-01

24

Online NIR diagnostic of laser welding processes and its potential for quality assuring sensor systems  

NASA Astrophysics Data System (ADS)

We have integrated an imaging thermographic sensor into commercial welding optics for observation of the weld zone. Key element of the sensor is an InGaAs-camera that detects the thermal radiation of the welding process in the wavelength range of 1,200 to 1,700 nm. This is well suited to record images of the keyhole, the melt pool and the thermal trace. The sensor was integrated to the welding heads for on-axis observation to minimize the interfering contour to ensure easy adaption to industrial processes. The welding heads used were established industrial-grade TRUMPF optics: a BEO fixed optics with 280 mm focal length, or a TRUMPF PFO-3D scanner optics with 450 mm focal length. We used a TRUMPF TruDisk 16002 16kW-thin disk laser that transmits its power through a 200 ?m core diameter light cable. The images were recorded and features of the various process zones were evaluated by image processing. It turns out that almost all weld faults can be clearly detected in the NIR images. Quantitative features like the dimension of the melt pool and the thermal trace can be derived from the captured images. They are correlated to process input parameters as well as to process results. In contrast to observation in the visible spectrum the NIR camera records the melt pool without auxiliary illumination. As an unrivaled attribute of the NIR sensor it supports an online heat flow thermography of the seam and allows identifying missing fusion ("false friends") of lap joints virtually during the welding process. Automated weld fault detection and documentation is possible by online image processing which sets the basis for comprehensive data documentation for quality assurance and traceability.

Dorsch, Friedhelm; Braun, Holger; Keβler, Steffen; Pfitzner, Dieter; Rominger, Volker

2014-02-01

25

The Henry Ford Production System: LEAN Process Redesign Improves Service in the Molecular Diagnostic Laboratory  

PubMed Central

Accurate and timely molecular test results play an important role in patient management; consequently, there is a customer expectation of short testing turnaround times. Baseline data analysis revealed that the greatest challenge to timely result generation occurred in the preanalytic phase of specimen collection and transport. Here, we describe our efforts to improve molecular testing turnaround times by focusing primarily on redesign of preanalytic processes using the principles of LEAN production. Our goal was to complete greater than 90% of the molecular tests in less than 3 days. The project required cooperation from different laboratory disciplines as well as individuals outside of the laboratory. The redesigned processes involved defining and standardizing the protocols and approaching blood and tissue specimens as analytes for molecular testing. The LEAN process resulted in fewer steps, approaching the ideal of a one-piece flow for specimens through collection/retrieval, transport, and different aspects of the testing process. The outcome of introducing the LEAN process has been a 44% reduction in molecular test turnaround time for tissue specimens, from an average of 2.7 to 1.5 days. In addition, extending LEAN work principles to the clinician suppliers has resulted in a markedly increased number of properly collected and shipped blood specimens (from 50 to 87%). These continuous quality improvements were accomplished by empowered workers in a blame-free environment and are now being sustained with minimal management involvement.

Cankovic, Milena; Varney, Ruan C.; Whiteley, Lisa; Brown, Ron; D'Angelo, Rita; Chitale, Dhananjay; Zarbo, Richard J.

2009-01-01

26

Development of a Petri net-based fault diagnostic system for industrial processes  

Microsoft Academic Search

For the improvement of the reliability and safety of industrial processes, a fault detection and tracing approach has been proposed. In this paper, the P-invariant of Petri nets (PN) is applied to discover sequence faults, while both sensor faults and actuator faults are detected using exclusive logic functions. For industrial applications, the proposed fault detector has been implemented within a

Jin-Shyan Lee; Chun-Chieh Chuang

2009-01-01

27

Optical Diagnostics Systems Supplementing Integrated Materials Processing Facility of Major University Research Initiative.  

National Technical Information Service (NTIS)

As part of the DoD-MURI research program entitled 'Modeling and control of Advanced Chemical Vapor Deposition Processes: the Control of Defects in Mixed III-V Compound Semiconductors' (Grant F49620-95-1-0447), DURIP funding was provided to establish a rea...

H. T. Banks K. J. Bachmann N. Dietz

2001-01-01

28

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

29

A Self-Diagnostic System for the M6 Accelerometer  

NASA Technical Reports Server (NTRS)

The design of a Self-Diagnostic (SD) accelerometer system for the Space Shuttle Main Engine is presented. This retrofit system connects diagnostic electronic hardware and software to the current M6 accelerometer system. This paper discusses the general operation of the M6 accelerometer SD system and procedures for developing and evaluating the SD system. Signal processing techniques using M6 accelerometer diagnostic data are explained. Test results include diagnostic data responding to changing ambient temperature, mounting torque and base mounting impedance.

Flanagan, Patrick M.; Lekki, John

2001-01-01

30

[Companion diagnostics and reimbursement system].  

PubMed

Recently, Companion Diagnostics (CoDx) have been gaining importance to promote personalized medicine in order to improve the safety and cost effectiveness of therapy. In July 2011, the FDA published draft guidance for the development of CoDx, which recommends the co-development of CoDx and new drugs as the best practice, and then the FDA approved vemurafenib and the BRAF-V600-E gene mutation assay simultaneously as a typical example of the co-development of a new drug and its CoDx. Considering medical needs for multiple biomarker assays to select the right assay from various therapeutic candidates, more complicated assay technologies such as DNA sequencing will be required for CoDx in the near future. However, since it is quite difficult to standardize the validation process and manage test quality under the current regulatory criteria of in-vitro diagnostics using advanced and/or complicated assay technologies, the clinical use of laboratory-developed tests (LDT) should be recommended in order to avoid biomarker test lag. On the other hand, the current reimbursement system is not always suitable to assess the clinical and technological value of CoDx and it should be revised to encourage the development of CoDx. Although Health Technology Assessment (HTA) is a potential method to assess the value of CoDx, it is not easy to define appropriate indicators for CoDx because its clinical utility and cost effectiveness are completely dependent on the performance and value of available therapy. It is also suggested that the price and/or insurance rate of CoDx should be included in the price of the drug; however, there is no good solution to how to pay for CoDx with negative results for all therapies. It is said that the concept of personalized medicine with advanced technologies is a destructive innovation that could markedly change the current structure and system of medications; therefore, it is essential to create a quite new regulatory and reimbursement system to provide patients with the right medicine at the right time. PMID:23947184

Tazawa, Yoshiaki

2013-05-01

31

Philosophy of science and the diagnostic process.  

PubMed

This is an overview of the principles that underpin philosophy of science and how they may provide a framework for the diagnostic process. Although philosophy dates back to antiquity, it is only more recently that philosophers have begun to enunciate the scientific method. Since Aristotle formulated deduction, other modes of reasoning including induction, inference to best explanation, falsificationism, theory-laden observations and Bayesian inference have emerged. Thus, rather than representing a single overriding dogma, the scientific method is a toolkit of ideas and principles of reasoning. Here we demonstrate that the diagnostic process is an example of science in action and is therefore subject to the principles encompassed by the scientific method. Although a number of the different forms of reasoning are used readily by clinicians in practice, without a clear understanding of their pitfalls and the assumptions on which they are based, it leaves doctors open to diagnostic error. We conclude by providing a case example from the medico-legal literature in which diagnostic errors were made, to illustrate how applying the scientific method may mitigate the chance for diagnostic error. PMID:23816636

Willis, Brian H; Beebee, Helen; Lasserson, Daniel S

2013-10-01

32

Self-learning fuzzy logic system for in situ, in-process diagnostics of mass flow controller (MFC)  

Microsoft Academic Search

An improvement in the yield of better quality wafers requires an accurate control of various process variables. The control should include timely diagnosis and appropriate in-situ, in-process adjustments for drifts in these variables. One such scheme, a self-learning fuzzy logic system, is developed in this study for correcting drifts in the calibration of mass flow controllers (MFC's) that control the

Ram K. Ramamurthi

1994-01-01

33

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.

Haug, P. J.

1993-01-01

34

Embedding CLIPS in a database-oriented diagnostic system  

NASA Technical Reports Server (NTRS)

This paper describes the integration of C Language Production Systems (CLIPS) into a powerful portable maintenance aid (PMA) system used for flightline diagnostics. The current diagnostic target of the system is the Garrett GTCP85-180L, a gas turbine engine used as an Auxiliary Power Unit (APU) on some C-130 military transport aircraft. This project is a database oriented approach to a generic diagnostic system. CLIPS is used for 'many-to-many' pattern matching within the diagnostics process. Patterns are stored in database format, and CLIPS code is generated by a 'compilation' process on the database. Multiple CLIPS rule sets and working memories (in sequence) are supported and communication between the rule sets is achieved via the export and import commands. Work is continuing on using CLIPS in other portions of the diagnostic system and in re-implementing the diagnostic system in the Ada language.

Conway, Tim

1990-01-01

35

MFTF-B plasma-diagnostic system  

SciTech Connect

This paper describes the current design status of the plasma diagnostic system for MFTF-B. In this paper we describe the system requirement changes which have occurred as a result of the funded rescoping of the original MFTF facility into MFTF-B. We outline the diagnostic instruments which are currently planned, and present an overview of the diagnostic system.

Throop, A.L.; Goerz, D.A.; Thomas, S.R.

1981-10-21

36

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

37

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

38

Diagnostics for slapper detonator systems  

Microsoft Academic Search

This report discusses diagnostics which have been used to evaluate CDU characteristics and performance, slapper characteristics and performance and the response of a HE detonator output pellet to a slapper stimulus. Many of the diagnostics discussed are appropriate for development and production testing. These include CVR current measurements, voltage probe measurements, time-of-flight measurements, threshold measurements, function time measurements, use of

R. E. Boberg; R. E. Lee; R. S. Lee; W. Von Holle

1989-01-01

39

Substation evaluation using Diagnostic Logic System (DIALOG)  

Microsoft Academic Search

This project investigated the feasibility of applying a Diagnostic Logic System (DIAGLOG) to evaluate substation operation. The purpose was to see if a determination can be made as to whether the equipment in a substation operated correctly or not when an operating event occurred. The work was directed toward modifying an already proven diagnostic system to create a simplified procedure

1989-01-01

40

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

41

MFTF Supervisory Control and Diagnostics System Hardware.  

National Technical Information Service (NTIS)

The Supervisory Control and Diagnostics System (SCDS) for the Mirror Fusion Test Facility (MFTF) is a multiprocessor minicomputer system designed so that for most single-point failures, the hardware may be quickly reconfigured to provide continued operati...

D. N. Butner

1979-01-01

42

Diagnostic expert systems from dynamic fault trees  

Microsoft Academic Search

A methodology for developing a diagnostic map for systems that can be analyzed via a dynamic fault tree is proposed in this paper. This paper shows how to automatically design a diagnostic decision tree from a dynamic fault tree used for reliability analysis. In particular the methodology makes use of Markov chains since they are mathematical models used for reliability

Tariq Assaf; Joanne Bechta Dugan

2004-01-01

43

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

44

A Comparison of Particle Diagnostic Systems.  

National Technical Information Service (NTIS)

An experimental investigation was conducted to examine the particle sizing characteristics of four particle diagnostic systems (PDS): a fiber-optics array probe (FOS), two separate particle-sizing interferometers (PSI), and a backscattering particle-sizin...

J. D. Hunt

1981-01-01

45

Diagnostic Test for Neuropsychiatric Systemic Lupus Erythematosus.  

National Technical Information Service (NTIS)

This invention provides methods for assessing the likelihood that a patient is suffering neuropsychiatric systemic lupus erythematosus by detecting autoantibodies in a sample from the patient. This invention also provides diagnostic kits for the same.

H. Spiera V. Hanson

2003-01-01

46

CHERS software system: A microVAX-based diagnostic  

SciTech Connect

The charge exchange recombination spectroscopy (CHERS) diagnostic is the first tokamak fusion test reactor (TFTR) diagnostic to utilize a microVAX II computer for device control, data acquisition, analysis, and event-driven processing. The CHERS system is controlled from a single interactive menu-driven process, enabling the diagnostic physicist to perform interactive device control and monitoring, calibration and control file editing, and to control automatic device setup, data acquisition and display, and postshot analysis. All software is written in f-smcapso-smcapsr-smcapst-smcapsr-smcapsa-smcapsn-smcaps. Device control is accomplished using the (ORNL) VAX CAMAC and TAU real-time image processing system (RTIPS) f-smcapso-smcapsr-smcapst-smcapsr-smcapsa-smcapsn-smcaps subroutines. Standard VAX system services are utilized, including the use of event flags, global sections, logical names, security services, process control, and spawning of subprocesses.

Lagin, L.; Schneider, U.; Arnold, N.; Fonck, R.; Jaehnig, K.; Roney, P.; Davis, W.; Christianson, G.

1986-08-01

47

Multivariate Diagnostic Processes: The PANEL Program.  

National Technical Information Service (NTIS)

This report presents a computer program, PANAL, which builds upon earlier attempts to use the computer in organizational diagnostic efforts. A general description, line list, and sample output are provided.

D. G. Bowers

1975-01-01

48

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.

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

49

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

50

Computer animated digital arc diagnostic system  

Microsoft Academic Search

An arc diagnostic system has been developed for analyzing arc motion, structure, and intensity in electrical components such as molded case circuit breakers and contactors. The system utilizes an array of fiber-optic cables and matching photodiode receivers to monitor the light from an arc and convert the light into electrical signals, which are acquired by a high-speed transient digitizing system.

John J. Shea; David Boles; Yun-Ko Chien; Rod Zeigler

1994-01-01

51

Racine Feedback and Diagnostic System.  

ERIC Educational Resources Information Center

The system is a comprehensive set of computer programs and procedures for assisting in the preparation, scoring and analysis of multiple choice test batteries. The system may be used with either standardized or locally developed tests. For the upper grades the system accepts pupil responses on mark-sense answer sheets. For lower grades pupil…

Racine Unified School District 1, WI.

52

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

53

False Alarm Mitigation of Vibration Diagnostic Systems  

Microsoft Academic Search

False alarms in legacy aircraft diagnostic systems have negatively impacted fleet maintenance costs and mission readiness. As the industry moves towards more advanced prognostic and health management (PHM) solutions, a reduction in false alarms is needed to reduce the cost and readiness burdens that have plagued legacy systems. It is therefore important to understand why these false alarms occur and

C. S. Byington; M. J. Watson; Sanket Amin; M. Begin

2008-01-01

54

Novel optical spectroscopy system for breast cancer diagnostics  

NASA Astrophysics Data System (ADS)

We report on development of minimally invasive system for immediate diagnostics of breast cancer and on the results of its pilot clinical testing. The system designed by BioTelligent Inc is based on analysis of optical diffusion spectra (ODS) measured by a probe inserted into breast tissue during standard punch biopsy. Analysis of scattered spectra aimed to distinction of benign tumors from malignant ones is done by original procedure of data processing. Clinical testing of the created diagnostic system has been performed by classification of spectra collected from 146 patients with previously detected mammary neoplasms. The data of ODS study in each patient have been compared to the results of histology. The proposed technique has to date demonstrated sensitivity of 96%, specificity of 80% and diagnostic accuracy of 88%. These values are expected to improve as the data sets continue to grow and more sophisticated data processing is employed.

Shakhova, Natalia; Turchin, Ilya; Kamensky, Vladislav; Sergeeva, Ekaterina; Golubyatnikov, German; Da Silva, Luiz; Kasthuri, Usha; Pavlycheva, Irina; Smetanina, Svetlana; Artifeksova, Anna; Belkov, Sergey; Kochemasov, Gennady

2007-03-01

55

The application of plasma diagnostics to process control  

Microsoft Academic Search

Summary form only given. The possibility of using plasma diagnostic tools to establish in-situ monitors to keep output capability high and allow real-time process control has been investigated. An initial study to examine this possibility was conducted on a tungsten etchback module on an LRC 490 etcher. The diagnostic tools used were an optical emission spectrometer, a residual gas analyzer,

K. Ashtiani; M.-C. Lu; T.-H. Lin

1993-01-01

56

Supervisory Control and Diagnostics System Distributed Operating System.  

National Technical Information Service (NTIS)

This paper contains a description of the Supervisory Control and Diagnostics System (SCDS) Distributed Operating System. The SCDS consists of nine 32-bit minicomputers with shared memory. The system's main purpose is to control a large Mirror Fusion Test ...

P. R. McGoldrick

1979-01-01

57

SH60 helicopter integrated diagnostic system (HIDS) program-diagnostic and prognostic development experience  

Microsoft Academic Search

The evolution of automated diagnostic systems for helicopter mechanical systems has been aided by a Navy program of systematic testing of drive train components having known anomalies (seeded faults) while simultaneously executing a suite of diagnostic techniques to identify and classify the mechanical anomalies. This program, called the Helicopter Integrated Diagnostic System (HIDS) has been carried out using an iron

William Hardman; Andrew Hess; Jonathan Sheaffer

1999-01-01

58

A specialized framework for Medical Diagnostic Knowledge Based Systems.  

PubMed Central

To have a knowledge based system (KBS) exhibiting an intelligent behavior, it must be endowed even with knowledge able to represent the expert's strategies, other than with domain knowledge. The elicitation task is inherently difficult for strategic knowledge, because strategy is often tacit, and, even when it has been made explicit, it is not an easy task to describe it in a form that may be directly translated and implemented into a program. This paper describes a Specialized Framework for Medical Diagnostic Knowledge Based Systems able to help an expert in the process of building KBSs in a medical domain. The framework is based on an epistemological model of diagnostic reasoning which has proved to be helpful in describing the diagnostic process in terms of the tasks by which it is composed of.

Lanzola, G.; Stefanelli, M.

1991-01-01

59

Diagnostic challenges of central nervous system tuberculosis.  

PubMed

Central nervous system tuberculosis (TB) was identified in 20 cases of unexplained encephalitis referred to the California Encephalitis Project. Atypical features (encephalitic symptoms, rapid onset, age) and diagnostic challenges (insensitive cerebrospinal fluid [CSF] TB PCR result, elevated CSF glucose levels in patients with diabetes, negative result for tuberculin skin test) complicated diagnosis. PMID:18760024

Christie, Laura J; Loeffler, Ann M; Honarmand, Somayeh; Flood, Jennifer M; Baxter, Roger; Jacobson, Susan; Alexander, Rick; Glaser, Carol A

2008-09-01

60

Diagnostic Challenges of Central Nervous System Tuberculosis  

PubMed Central

Central nervous system tuberculosis (TB) was identified in 20 cases of unexplained encephalitis referred to the California Encephalitis Project. Atypical features (encephalitic symptoms, rapid onset, age) and diagnostic challenges (insensitive cerebrospinal fluid [CSF] TB PCR result, elevated CSF glucose levels in patients with diabetes, negative result for tuberculin skin test) complicated diagnosis.

Loeffler, Ann M.; Honarmand, Somayeh; Flood, Jennifer M.; Baxter, Roger; Jacobson, Susan; Alexander, Rick; Glaser, Carol A.

2008-01-01

61

Substation evaluation using Diagnostic Logic System (DIALOG)  

SciTech Connect

This project investigated the feasibility of applying a Diagnostic Logic System (DIAGLOG) to evaluate substation operation. The purpose was to see if a determination can be made as to whether the equipment in a substation operated correctly or not when an operating event occurred. The work was directed toward modifying an already proven diagnostic system to create a simplified procedure for describing the operation of substation equipment. Special operating tables or modules of logic were identified for describing relay and breaker operations. The resulting model composed of all the modules connected together is used to evaluate the actual observations available at the substation, and to compare them with what the substation should have produced. The report covers the diagnostic approach used, information on how to construct the modules and examples of diagnosis. Also covered are discussions on the special features of substations that offer a challenge to performing diagnostics. Included in the report are the results of modeling a typical substation and several notes are provided along with an initial library of typical modules which were developed in modeling one of the substations belonging to the Pacific Gas and Electric Company. This substation served as a feasibility demonstrator. 15 figs.

Andre, W.L.

1989-08-01

62

Optical Diagnostic System for the TLS  

SciTech Connect

The Taiwan light source (TLS) uses a photon beam intensity system (Io monitor) to index the electron beam stability. This index combines the information of the fluctuations of electron beam position and size. For understanding the impact of these fluctuations to the electron beam instability, a set of the optical diagnostic system was installed in the TLS BL10 diagnostics beamline. This system includes the photon beam position monitor (PBPM), the beam size monitor (BSM) and the Io monitor. From the result, we concluded that about one-third impact of beam instability came from the fluctuation of electron beam position and about two-thirds impact of beam instability came from the fluctuation of electron beam size. The hardware configuration is described in this paper.

Kuan, C. K.; Tseng, T. C.; Wang, D. J.; Hsiung, G. Y.; Perng, S. Y.; Tsai, Z. D.; Ueng, T. S.; Hsueh, H. P.; Chen, J. R. [National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan (China)

2007-01-19

63

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

64

Diagnostic vertigo: The journey to diagnosis in systemic lupus erythematosus.  

PubMed

Systemic lupus erythematosus (lupus) is a complex condition characterised by wide ranging symptoms that are sometimes transient in nature. This makes recognising and diagnosing lupus particularly challenging for both patients and practitioners. The diagnostic process in this condition is a complex interplay between the boundaries of knowledge and power, control, integrity and legitimacy, which are (re)constructed and (re)negotiated between contemporary medicine, the patient and practitioner. Utilising data generated through a qualitative research design, this article illustrates some of the challenges lupus presents in the clinical encounter. We argue that the diagnosis of lupus is not a clinical event or a 'diagnostic moment'. Rather, it constitutes a journey in and of itself, one which, for many of the respondents in this study, has no diagnostically satisfying conclusion. We conclude that uncertain diagnoses, such as lupus, illustrate the extent of both embodied and clinical doubt in, what might be termed, contemporary conditions and, concomitantly, throw into sharp relief the nature of the diagnostic process. This process, in the context of lupus, and other uncertain conditions, generates, we would argue, a sense of diagnostic vertigo. PMID:23749429

Price, Elizabeth; Walker, Elizabeth

2014-05-01

65

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

66

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

67

Experience report with the Alignment Diagnostic System  

SciTech Connect

Since 2009 an Alignment Diagnostic System (ADS) has been operating at the undulator of the new Linac Coherent Light Source at SLAC National Accelerator Laboratory. The undulator spans a distance of 132 meters and is structured into 33 segments. Each segment is equipped with four hydrostatic leveling sensors and four wire position monitors. This report describes the set up and reflects the experience gained with the ADS.

Gassner, Georg; /SLAC

2011-03-03

68

The Diagnostic Process from a Freirean Perspective.  

ERIC Educational Resources Information Center

Presents a way of approaching the reality of oppression in the counseling profession to ameliorate the pain and suffering that characterizes many lives. Asserts that mental health professionals can benefit from awareness of Freire's process of naming, reflecting, and acting. Describes unintended consequences of diagnosing that may be intended…

Demmitt, Alan; Oldenski, Thomas

1999-01-01

69

Plasma diagnostics in plasma processing for nanotechnology and nanolevel chemistry  

Microsoft Academic Search

The author reviews the role of various plasma diagnostics in plasma processing for nanotechnology, and points out some essential methods of spectroscopic methods to diagnose plasmas for nanoprocessing. Two experimental examples are discussed between the characteristics of nanomaterials and plasma parameters. One is measurement of rotation temperature in processing of carbon nanotube. The other is that of vibrational temperature in

Hiroshi Akatsuka

2004-01-01

70

Development plan for an advanced drilling system with real-time diagnostics (Diagnostics-While-Drilling)  

SciTech Connect

This proposal provides the rationale for an advanced system called Diagnostics-while-drilling (DWD) and describes its benefits, preliminary configuration, and essential characteristics. The central concept is a closed data circuit in which downhole sensors collect information and send it to the surface via a high-speed data link, where it is combined with surface measurements and processed through drilling advisory software. The driller then uses this information to adjust the drilling process, sending control signals back downhole with real-time knowledge of their effects on performance. The report presents background of related previous work, and defines a Program Plan for US Department of Energy (DOE), university, and industry cooperation.

FINGER,JOHN T.; MANSURE,ARTHUR J.; PRAIRIE,MICHAEL R.; GLOWKA,D.A.

2000-02-01

71

Simple sample processing enhances malaria rapid diagnostic test performance.  

PubMed

Lateral flow immunochromatographic rapid diagnostic tests (RDTs) are the primary form of medical diagnostic used for malaria in underdeveloped nations. Unfortunately, many of these tests do not detect asymptomatic malaria carriers. In order for eradication of the disease to be achieved, this problem must be solved. In this study, we demonstrate enhancement in the performance of six RDT brands when a simple sample-processing step is added to the front of the diagnostic process. Greater than a 4-fold RDT signal enhancement was observed as a result of the sample processing step. This lowered the limit of detection for RDT brands to submicroscopic parasitemias. For the best performing RDTs the limits of detection were found to be as low as 3 parasites per ?L. Finally, through individual donor samples, the correlations between donor source, WHO panel detection scores and RDT signal intensities were explored. PMID:24787948

Davis, K M; Gibson, L E; Haselton, F R; Wright, D W

2014-06-21

72

Comparison of emerging diagnostic tools for large commercial HVAC systems  

SciTech Connect

Diagnostic software tools for large commercial buildings are being developed to help detect and diagnose energy and other performance problems with building operations. These software applications utilize energy management control system (EMCS) trend log data. Due to the recent development of diagnostic tools, there has been little detailed comparison among the tools and a limited awareness of tool capabilities by potential users. Today, these diagnostic tools focus mainly on air handlers, but the opportunity exists for broadening the scope of the tools to include all major parts of heating, cooling, and ventilation systems in more detail. This paper compares several tools in the following areas: (1) Scope, intent, and background; (2) Data acquisition, pre-processing, and management; (3) Problems detected; (4) Raw data visualization; (5) Manual and automated diagnostic methods and (6) Level of automation. This comparison is intended to provide practitioners and researchers with a picture of the current state of diagnostic tools. There is tremendous potential for these tools to help improve commercial building energy and non-energy performance.

Friedman, Hannah; Piette, Mary Ann

2001-04-06

73

Development of signal processing tools and hardware for piezoelectric sensor diagnostic processes  

NASA Astrophysics Data System (ADS)

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/electrical 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, we 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 effcient signal processing techniques to account for those variations in the sensor diagnosis process. In addition, we 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. S.; Park, Gyuhae; Farrar, Charles R.

2007-03-01

74

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

75

System for computerized TV iris diagnostics  

NASA Astrophysics Data System (ADS)

Iridodiagnostics, using the information, encoded in human iris, gives an integrated picture of human health, mirroring even preclinic states, genetic peculiarities and predispositions. To decode this information, TV image processing is used for automatic measurement of several diagnostic features, such as pupil ellipticity, pupil flattening, indenteness of the autonomous ring, its minima and maxima parameters, etc. An instrument setup is described for acquiring and processing TV image of an iris. In one of the variants, color image is produced with a black-and-white TV camera due to sequential R-, G-, and B-frames resulting from alternating color pulse illumination. For the sake of classification, sequential methodology was modified, performing multiple tests over the same data and permitting an adaptation in the process of learning.

Molebny, Vasyl V.; Kolomatsky, Yuri; Chumak, Serhi; Vasko, Mykola; Myrhorodska, Tetyana

1993-09-01

76

Diagnostic value of image processing in myocardial scintigraphy  

SciTech Connect

The diagnostic value of stress myocardial analog scintigrams, and of five image-processing methods, was assessed by a decisional analysis in 96 patients undergoing coronary arteriography. The methods involved digitalization, nine-point binomial smoothing, background subtraction by linear interpolation, stationary filtering, and a combination of them. The difference between after-test probabilities of having the disease with a postive or a negative examination provided a discriminant index for different prevalences of the disease. Though the processing methods failed to improve the detection of a circumflex stenosis, the stationary filter significantly increased the diagnostic value for the detection of stenosis in a left anterior descending artery for a large range of prevalence, and in a right coronary artery at high prevalence. Thus, the filter seemed to provide a useful tool for enhancing the diagnostic value of myocardial scintigraphy.

Cinotti, L.; Meignan, M.; Usdin, J.P.; Vasile, N.; Castaigne, A.

1983-09-01

77

Diagnostic value of image processing in myocardial scintigraphy  

SciTech Connect

The diagnostic value of stress myocardial analog scintigrams, and of five image-processing methods, was assessed by a decisional analysis in 96 patients undergoing coronary arteriography. The methods involved digitalization, nine-point binomial smoothing, background subtraction by linear interpolation, stationary filtering, and a combination of them. The difference between after-test probabilities of having the disease with a positive or a negative examination provided a discriminant index for different prevalences of the disease. Though the processing methods failed to improve the detection of a circumflex stenosis, the stationary filter significantly increased the diagnostic value for the detection of stenosis in a left anterior descending artery for a large range of prevalence, and in a right coronary artery at high prevalence. Thus, the filter seemed to provide a useful tool for enhancing the diagnostic value of myocardial scintigraphy.

Cinotti, L.; Meignan, M.; Usdin, J.P.; Vasile, N.; Castaigne, A.

1983-09-01

78

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

79

Efficient Probabilistic Diagnostics for Electrical Power Systems  

NASA Technical Reports Server (NTRS)

We consider in this work the probabilistic approach to model-based diagnosis when applied to electrical power systems (EPSs). Our probabilistic approach is formally well-founded, as it based on Bayesian networks and arithmetic circuits. We investigate the diagnostic task known as fault isolation, and pay special attention to meeting two of the main challenges . model development and real-time reasoning . often associated with real-world application of model-based diagnosis technologies. To address the challenge of model development, we develop a systematic approach to representing electrical power systems as Bayesian networks, supported by an easy-to-use speci.cation language. To address the real-time reasoning challenge, we compile Bayesian networks into arithmetic circuits. Arithmetic circuit evaluation supports real-time diagnosis by being predictable and fast. In essence, we introduce a high-level EPS speci.cation language from which Bayesian networks that can diagnose multiple simultaneous failures are auto-generated, and we illustrate the feasibility of using arithmetic circuits, compiled from Bayesian networks, for real-time diagnosis on real-world EPSs of interest to NASA. The experimental system is a real-world EPS, namely the Advanced Diagnostic and Prognostic Testbed (ADAPT) located at the NASA Ames Research Center. In experiments with the ADAPT Bayesian network, which currently contains 503 discrete nodes and 579 edges, we .nd high diagnostic accuracy in scenarios where one to three faults, both in components and sensors, were inserted. The time taken to compute the most probable explanation using arithmetic circuits has a small mean of 0.2625 milliseconds and standard deviation of 0.2028 milliseconds. In experiments with data from ADAPT we also show that arithmetic circuit evaluation substantially outperforms joint tree propagation and variable elimination, two alternative algorithms for diagnosis using Bayesian network inference.

Mengshoel, Ole J.; Chavira, Mark; Cascio, Keith; Poll, Scott; Darwiche, Adnan; Uckun, Serdar

2008-01-01

80

Logic code transformation and minimization algorithm for fault diagnostic systems  

Microsoft Academic Search

Modern paper winders have hundreds of actuators and thousands of lines of programmable logic controller code. The complex structure of winder and its control software requires also new kinds of diagnostic methods. With modern fault diagnostic systems, the operator can quickly and accurately identify the cause of a fault. Building up a fault diagnostic system requires usually a lot of

Timo Virtanen

2004-01-01

81

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

82

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

83

Image processing and machine learning for diagnostic analysis of microcirculation  

Microsoft Academic Search

This study focuses on detection of capillaries and small blood vessels in the videos recorded from the lingual surface using Microscan SDF system. The purpose of this study is to quantitatively monitor and assess the changes that occur in microcirculation during resuscitation period. The results assist physicians in making diagnostically and therapeutically important decisions such as determination of the effectiveness

Sumeyra Demir; Nazanin Mirshahi; M. H. Tiba; G. Draucker; K. Ward; R. Hobson; K. Najarian

2009-01-01

84

Target diagnostic system for the national ignition facility (invited)  

Microsoft Academic Search

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

R. J. Leeper; G. A. Chandler; G. W. Cooper; M. S. Derzon; D. L. Fehl; D. E. Hebron; A. R. Moats; D. D. Noack; J. L. Porter; L. E. Ruggles; C. L. Ruiz; J. A. Torres; M. D. Cable; P. M. Bell; C. A. Clower; B. A. Hammel; D. H. Kalantar; V. P. Karpenko; R. L. Kauffman; J. D. Kilkenny; F. D. Lee; R. A. Lerche; B. J. MacGowan; M. J. Moran; M. B. Nelson; W. Olson; T. J. Orzechowski; T. W. Phillips; D. Ress; G. L. Tietbohl; J. E. Trebes; R. J. Bartlett; R. Berggren; S. E. Caldwell; R. E. Chrien; B. H. Failor; J. C. Fernandez; A. Hauer; G. Idzorek; R. G. Hockaday; T. J. Murphy; J. Oertel; R. Watt; M. Wilke; D. K. Bradley; J. Knauer; R. D. Petrasso; C. K. Li

1997-01-01

85

The Principles and Applications of the Ultrasound Diagnostic System  

Microsoft Academic Search

An ultrasound diagnostic system has become an important and popular diagnostic tool due to its wide range of applications. The non-invasive, non-destructive nature of ultrasound, real- time imaging and portable system are the advantages over the medical imaging system such as X-ray, CT and MRI. Due to these advantages of ultrasound diagnostic system, it has been extensively used in the

Chi Young Ahn

86

Multi-agent-Based Diagnostics of Automotive Electronic Systems  

Microsoft Academic Search

The diagnostic system discussed in this paper provides an agent-based approach to advanced on-board diagnostics of operation\\u000a and communication failures occurring in an electronic automotive system. To facilitate development and testing of agent-based\\u000a automotive diagnostics, a software simulator of automotive electronics systems, also based on multi-agent technology, has\\u000a been implemented, allowing the developers to simulate various automotive system failures. The

Dusan Pavlícek; Michal Pechoucek; Vladimír Marík; Ondrej Flek

2007-01-01

87

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

88

System control module diagnostic Expert Assistant  

NASA Technical Reports Server (NTRS)

The Orbiter EXperiments (OEX) Program was established by NASA's Office of Aeronautics and Space Technology (OAST) to accomplish the precise data collection necessary to support a complete and accurate assessment of Space Transportation System (STS) Orbiter performance during all phases of a mission. During a mission, data generated by the various experiments are conveyed to the OEX System Control Module (SCM) which arranges for and monitors storage of the data on the OEX tape recorder. The SCM Diagnostic Expert Assistant (DEA) is an expert system which provides on demand advice to technicians performing repairs of a malfunctioning SCM. The DEA is a self-contained, data-driven knowledge-based system written in the 'C' Language Production System (CLIPS) for a portable micro-computer of the IBM PC/XT class. The DEA reasons about SCM hardware faults at multiple levels; the most detailed layer of encoded knowledge of the SCM is a representation of individual components and layouts of the custom-designed component boards.

Flores, Luis M.; Hansen, Roger F.

1990-01-01

89

Development of Optical Diagnostic Techniques for Microgravity Materials Processing  

NASA Technical Reports Server (NTRS)

Materials processing including crystal growth, either under a gravity environment on ground or a microgravity environment in space, involves complicated phenomena of fluid motions in gas or liquid phases as well as interaction of various species. To obtain important physical insight, it is very necessary to provide gross-field optical diagnostics for monitoring various physical properties. Materials processing inhibits easy access by ordinary instruments and thus characterizing gross-field physical properties is very challenging. Typical properties of importance can be fluid velocity, temperature, and species concentration for fluids, and surface topology and defects for solids. Observing surface grow rate during crystal growth is also important. Material microstructures, i.e., integrity of crystal structures, is strongly influenced by the existence of thermally-induced flow as well as local nucleation of particles during solidification, which may act in many detrimental ways. In both ground-based and microgravity experiments, the nature of product property changes resulting from three-dimensional fluid or particle motions need be characterized. Gross-field diagnostics is thus required to identify their effects on product defects and process deficiencies. The quantitative visualization techniques can also be used for validation of numerical modeling. For optical nonintrusive gross-field diagnostic techniques, two approaches were developed as summer projects. One optical approach allows us to provide information of species concentration and temperature for monitoring in real time. The other approach, that is, the concept which is formulated for detection of surface topography measurement can provide unprecedented spatial resolution during crystal growth.

Cha, Soyoung Stephen

1999-01-01

90

Turbine Engine Diagnostics (TED): A Practical Application of a Diagnostic Expert System.  

National Technical Information Service (NTIS)

Turbine engine diagnostics (TED) is a diagnostic expert system that aids the M1 Abrams' mechanic in finding and fixing problems in the AGT-1500 turbine engine. TED was designed to provide the apprentice mechanic the ability to diagnose and repair the turb...

H. Ingham R. Helfman T. Hanratty J. Dumer E. H. Baur

1998-01-01

91

TED-Turbine Engine Diagnostics: A Practical Application of a Diagnostic Expert System  

Microsoft Academic Search

TED (Turbine Engine Diagnostics) is a diagnostic expert system to aid an M1 Abrams tank mechanic in finding and fixing problems in an AGT-1500 turbine engine. TED was designed to provide apprentice mechanics with the ability to diagnose and repair a turbine engine like an expert mechanic. This paper discusses the reasoning method used in TED, called the Procedural Reasoning

Holly Ingham; Richard Helfman; Tim Hanratty; John Dumer; Edmund H. Baur

1997-01-01

92

An enhanced diagnostic system for gear system monitoring.  

PubMed

The detection of the onset of damage in gear systems (e.g., gearboxes)is of great importance to a wide array of industries. In this paper, an enhanced diagnostic (ED) system is developed for real-time gear system condition monitoring. A neurofuzzy (NF) paradigm is adopted for pattern classification of the features from the energy, amplitude, and phase domains. The diagnostic reliability is enhanced by properly integrating predicted future machinery states that are forecast by recurrent NF predictors. An online training technique is proposed to improve the classifier's adaptive capability to accommodate different machinery conditions. The viability of this new monitoring system has been verified by experimental tests under different gear conditions. This proposed ED system has also been applied for real-time condition monitoring in multistage printing machines. The primary application has demonstrated its reliability as an effective monitoring tool for both production quality control and maintenance planning. PMID:18293491

Wang, Wilson

2008-02-01

93

A self diagnostic system for piezoelectric sensors  

NASA Technical Reports Server (NTRS)

A technique for determining the mounting conditions of a piezoelectric accelerometer is presented. This technique electrically stimulates the piezoelectric element in the 'diagnostic' frequency band measuring the electrical frequency response characteristics across a capacitive load impedance. The diagnostic frequency band is tipically much higher than the operating bandwidth of the accelerometer. The resonant frequencies of the accelerometer are included in the diagnostic band. By monitoring the shift in these resonant frequencies, via electrical stimulation techniques, certain diagnostic conditions including mounting conditions can be determined. Experimental data from a compression mode accelerometer is used to demonstrate this technique.

Atherton, William J.; Flanagan, Patrick M.

1989-01-01

94

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

95

Developing a self-diagnostic system for piezoelectric sensors  

Microsoft Academic Search

Measurement techniques for developing a self-diagnostic system for piezoelectric sensors are presented. The self-diagnostic system uses two types of measurement techniques based on passive and active evaluation of the piezoelectric element. Both hard and soft failures can be detected by this system. Hard failures such as loss of sensor signal and change in sensor output resistance are determined by monitoring

Patrick M. Flanagan; William J. Atherton

1990-01-01

96

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

97

Supervisory Control and Diagnostics System for the Mirror Fusion Test Facility: Overview and Status 1980.  

National Technical Information Service (NTIS)

The Mirror Fusion Test Facility (MFTF) is a complex facility requiring a highly-computerized Supervisory Control and Diagnostics System (SCDS) to monitor and provide control over ten subsystems; three of which require true process control. SCDS will provi...

P. R. McGoldrick

1981-01-01

98

A self diagnostic system for piezoelectric sensors  

Microsoft Academic Search

A technique for determining the mounting conditions of a piezoelectric accelerometer is presented. This technique electrically stimulates the piezoelectric element in the 'diagnostic' frequency band measuring the electrical frequency response characteristics across a capacitive load impedance. The diagnostic frequency band is tipically much higher than the operating bandwidth of the accelerometer. The resonant frequencies of the accelerometer are included in

William J. Atherton; Patrick M. Flanagan

1989-01-01

99

A comparison of particle diagnostic systems  

NASA Astrophysics Data System (ADS)

An experimental investigation was conducted to examine the particle sizing characteristics of four particle diagnostic systems (PDS): a fiber-optics array probe (FOS), two separate particle-sizing interferometers (PSI), and a backscattering particle-sizing system (BPS). Simulated icing clouds, produced in an icing research test cell, were used as the particle flow field for the investigation. An in-line holocamera was selected as the baseline device and was, therefore, used to calibrate each icing cloud. Each PDS was used to obtain particle size information for each simulated icing cloud. Typical examples of the results obtained with each PDS are presented as well as typical calibration results. The results obtained with each PDS are also compared to the calibration results. The comparisons show that the FOS is the only device tested that yields results comparable to the holocamera results. The particle number density of a simulated icing cloud is shown to be too large for obtaining accurate particle size data with an on-axis forward-scattering PSI. The data obtained with the BPS exhibit a monodisperse distribution and are inconsistent with the holographically obtained calibration data.

Hunt, J. D.

1981-08-01

100

A new classification system for lesbians: the Dyke Diagnostic Manual.  

PubMed

There has been a long-standing need for a diagnostic manual that documents the unique pathological behaviors of lesbians. The Dyke Diagnostic Manual (DDM) is meant to supplement mainstream classification systems used to identify problematic behaviors in heterosexuals. This article presents thirteen uniquely lesbian conditions that are nowhere to be found in heterosexist diagnostic systems. The DDM may help to reduce the pain and suffering found in many lesbian relationships where one or both partners are afflicted. PMID:20661801

Eliason, Michele J

2010-01-01

101

Effects of temperature variations on piezoelectric sensor diagnostics process based on impedance measurements (presentation video)  

NASA Astrophysics Data System (ADS)

A sensor diagnostic and validation process that performs in-situ monitoring of the operational status of piezoelectric (PZT) active-sensors in structural health monitoring (SHM) applications is presented. The basis of this process is to track the changes in the capacitive value of piezoelectric materials, which shows up in measured admittance. Both degradation of the mechanical/electrical properties of a PZT transducer and the bonding defects between a PZT patch and a host structure could be identified by the proposed process. Due to the temperature dependent nature of piezoelectric materials, we investigated the effects of temperature on sensor diagnostic process. The effect of temperature found to be remarkable, modifying the measured capacitive values significantly. This results indicates that there is need for developing a rigorous signal processing technique to normalizing the temperature effects. It has been also found that, as the temperature changes, the sensor diagnostic process was influenced not only by a sensor and a structure, but by a bonding materials that was used for attaching a piezoelectric transducers to a structure, which would be an important characteristic when designing an SHM system. This paper summarizes considerations needed to develop such sensor diagnostic processes, experimental procedures and results, and additional issues that can be used as guidelines for future investigations.

Jo, HyeJin; Park, Tong-il; Park, Gyehae

2014-05-01

102

Evaluating Detection and Diagnostic Decision Support Systems for Bioterrorism Response  

PubMed Central

We evaluated the usefulness of detection systems and diagnostic decision support systems for bioterrorism response. We performed a systematic review by searching relevant databases (e.g., MEDLINE) and Web sites for reports of detection systems and diagnostic decision support systems that could be used during bioterrorism responses. We reviewed over 24,000 citations and identified 55 detection systems and 23 diagnostic decision support systems. Only 35 systems have been evaluated: 4 reported both sensitivity and specificity, 13 were compared to a reference standard, and 31 were evaluated for their timeliness. Most evaluations of detection systems and some evaluations of diagnostic systems for bioterrorism responses are critically deficient. Because false-positive and false-negative rates are unknown for most systems, decision making on the basis of these systems is seriously compromised. We describe a framework for the design of future evaluations of such systems.

Sundaram, Vandana; McDonald, Kathryn M.; Smith, Wendy M.; Szeto, Herbert; Schleinitz, Mark D.; Owens, Douglas K.

2004-01-01

103

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

104

Systematic Benchmarking of Diagnostic Technologies for an Electrical Power System  

NASA Technical Reports Server (NTRS)

Automated health management is a critical functionality for complex aerospace systems. A wide variety of diagnostic algorithms have been developed to address this technical challenge. Unfortunately, the lack of support to perform large-scale V&V (verification and validation) of diagnostic technologies continues to create barriers to effective development and deployment of such algorithms for aerospace vehicles. In this paper, we describe a formal framework developed for benchmarking of diagnostic technologies. The diagnosed system is the Advanced Diagnostics and Prognostics Testbed (ADAPT), a real-world electrical power system (EPS), developed and maintained at the NASA Ames Research Center. The benchmarking approach provides a systematic, empirical basis to the testing of diagnostic software and is used to provide performance assessment for different diagnostic algorithms.

Kurtoglu, Tolga; Jensen, David; Poll, Scott

2009-01-01

105

Proton storage ring (PSR) diagnostics and control system  

SciTech Connect

When any new accelerator or storage ring is built that advances the state of the art, the diagnostic system becomes extremely important in tuning the facility to full specification. This paper will discuss the various diagnostic devices planned or under construction for the PSR and their connection into the control system.

Clout, P.

1983-01-01

106

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

107

Diagnostic system for high-voltage electrical components.  

National Technical Information Service (NTIS)

This paper presents an example, indicating system logic and architecture, of a centralized diagnostic system for a modern substation. Detail are provided of the part relevant to the most important functions and operations required: measurements and transd...

C. Masetti

1988-01-01

108

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

109

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

110

BioMEMS in medicine: diagnostic and therapeutic systems  

Microsoft Academic Search

The applications of bio-microelectromechanical systems (bioMEMS) in medicine can be classified as diagnostic or therapeutic systems. In the laboratory, microfluidic systems for cell analysis and characterization contribute to the development of diagnostic systems. Implantable biomedical microdevices can benefit many patients with neurological conditions or spinal cord injury, and flexible polymer-based microelectrode arrays are key technology in future neuroprosthetic devices. Advances

Karen C. Cheung; Philippe Renaud

2005-01-01

111

Hybrid Image Processing System.  

National Technical Information Service (NTIS)

A hybrid optical/digital image processing system has been developed for an ongoing research program in hybrid image processing. This system is described and its capabilities and limitations are discussed. Major system components include a coherent optical...

T. H. May J. A. Blodgett

1980-01-01

112

Target diagnostic system for the national ignition facility (invited)  

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, electromagnetic pulse, 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. {copyright} {ital 1997 American Institute of Physics.}

Leeper, R.J.; Chandler, G.A.; Cooper, G.W.; Derzon, M.S.; Fehl, D.L.; Hebron, D.E.; Moats, A.R.; Noack, D.D.; Porter, J.L.; Ruggles, L.E.; Ruiz, C.L.; Torres, J.A. [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)] [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States); Cable, M.D.; Bell, P.M.; Clower, C.A.; Hammel, B.A.; Kalantar, D.H.; Karpenko, V.P.; Kauffman, R.L.; Kilkenny, J.D.; Lee, F.D.; Lerche, R.A.; MacGowan, B.J.; Moran, M.J.; Nelson, M.B.; Olson, W.; Orzechowski, T.J.; Phillips, T.W.; Ress, D.; Tietbohl, G.L.; Trebes, J.E. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)] [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Bartlett, R.J.; Berggren, R.; Caldwell, S.E.; Chrien, R.E.; Failor, B.H.; Fernandez, J.C.; Hauer, A.; Idzorek, G.; Hockaday, R.G.; Murphy, T.J.; Oertel, J.; Watt, R.; Wilke, M. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Bradley, D.K.; Knauer, J. [University of Rochester, Rochester, New York 14627 (United States)] [University of Rochester, Rochester, New York 14627 (United States); Petrasso, R.D.; Li, C.K. [Massachusetts Institute of Technology, Plasma Fusion Center, Cambridge, Massachusetts 02139 (United States)] [Massachusetts Institute of Technology, Plasma Fusion Center, Cambridge, Massachusetts 02139 (United States)

1997-01-01

113

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

114

Systematic benchmarking of diagnostic technologies for an electrical power system  

Microsoft Academic Search

Automated health management is a critical functionality for complex aerospace systems. A wide variety of diagnostic algorithms have been developed to address this technical challenge. Unfortunately, the lack of support to perform large-scale V&V (verification and validation) of diagnostic technologies continues to create barriers to effective development and deployment of such algorithms for aerospace vehicles. In this paper, we describe

Tolga Kurtoglu; David Jensen; Scott Poll

2009-01-01

115

Mechanical system diagnostics using vibration testing techniques  

NASA Technical Reports Server (NTRS)

The 'Cepstrum' technique of vibration-path identification allows the recovery of the transfer function of a system with little knowledge as to its excitation force, by means of a mathematical manipulation of the system output in conjunction with subtraction of part of the output and suitable signal processing. An experimental program has been conducted to evaluate the usefulness of this technique in the cases of simple, cantilever-beam and free-free plate structures as well as in that of a complex mechanical system. On the basis of the transfer functions thus recovered, it was possible to evaluate the shifts in the resonance frequencies of a structure due to the presence of defects.

Mcleod, Catherine D.; Raju, P. K.; Crocker, M. J.

1990-01-01

116

DIII-D Thomson Scattering Diagnostic Data Acquisition, Processing and Analysis Software  

SciTech Connect

One of the diagnostic systems critical to the success of the DIII-D tokamak experiment is the Thomson scattering diagnostic. This diagnostic is unique in that it measures local electron temperature and density: (1) at multiple locations within the tokamak plasma; and (2) at different times throughout the plasma duration. Thomson ''raw'' data are digitized signals of scattered light, measured at different times and locations, from the laser beam paths fired into the plasma. Real-time acquisition of this data is performed by specialized hardware. Once obtained, the raw data are processed into meaningful temperature and density values which can be analyzed for measurement quality. This paper will provide an overview of the entire Thomson scattering diagnostic software and will focus on the data acquisition, processing, and analysis software implementation. The software falls into three general categories: (1) Set-up and Control: Initializes and controls all Thomson hardware and software, synchronizes with other DIII-D computers, and invokes other Thomson software as appropriate. (2) Data Acquisition and Processing: Obtains raw measured data from memory and processes it into temperature and density values. (3) Analysis: Provides a graphical user interface in which to perform analysis and sophisticated plotting of analysis parameters.

Middaugh, K.R.; Bray, B.D.; Hsieh, C.L.; McHarg, B.B., Jr.; Penaflor, B.G.

1999-06-01

117

Overview of the data acquisition and control system for plasma diagnostics on MFTF-B  

SciTech Connect

For MFTF-B, the plasma diagnostics system is expected to grow from a collection of 12 types of diagnostic instruments, initially producing about 1 Megabyte of data per shot, to an expanded set of 22 diagnostics producing about 8 Megabytes of data per shot. To control these diagnostics and acquire and process the data, a system design has been developed which uses an architecture similar to the supervisory/local-control computer system which is used to control other MFTF-B subsystems. This paper presents an overview of the hardware and software that will control and acquire data from the plasma diagnostics system. Data flow paths from the instruments, through processing, and into final archived storage will be described. A discussion of anticipated data rates, including anticipated software overhead at various points of the system, is included, along with the identification of possible bottlenecks. A methodology for processing of the data is described, along with the approach to handle the planned growth in the diagnostic system. Motivations are presented for various design choices which have been made.

Wyman, R.H.; Deadrick, F.J.; Lau, N.H.; Nelson, B.C.; Preckshot, G.G.; Throop, A.L.

1983-11-18

118

A hybrid piezoelectric/fiber optic diagnostic system for structural health monitoring  

NASA Astrophysics Data System (ADS)

A hybrid piezoelectric/fiber optic diagnostic system has been developed for quick non-destructive evaluation and long term health monitoring of aerospace vehicles and structures. The hybrid diagnostic system uses piezoelectric actuators to input a controlled excitation to the structure and fiber optic sensors to capture the corresponding structural response. The system consists of three major parts: a diagnostic layer with a network of piezoelectric elements and fiber gratings to offer a simple and efficient way to integrate a large network of transducers onto a structure; diagnostic hardware consisting of an arbitrary waveform generator and a high speed fiber grating demodulation unit together with a high speed data acquisition card to provide actuation input, data collection, and information processing; and diagnostic software to determine the condition of the structure. This paper presents key development issues related to the manufacturing of the hybrid piezoelectric/fiber optic diagnostic layer and integration of a highly portable diagnostic hardware. Validation and proof testing of this integrated diagnostic system are also presented.

Qing, Xinlin; Kumar, Amrita; Zhang, Chang; Gonzalez, Ignacio F.; Guo, Guangping; Chang, Fu-Kuo

2005-06-01

119

RADC/EEV diagnostic rhyme test system improvements  

NASA Astrophysics Data System (ADS)

This report fully documents the current Diagnostic Rhyme Test (DRT) System used at RADC/EEV for the test and evaluation of the intelligibility of digital voice communication systems. All improvements to this system are presented in detail. This report is structured to serve both as a guide for the use of the DRT system and as a reference for modification of the software or for conversion of the software to another facility. This report documents four special projects that are associated with the DRT system. A modification to the DRT that allows for the measurement of the intelligibility of systems that are heavily affected by transmission drop-outs or bursts of transmission errors is presented. A method and system for performing the DRT at Field sites is given. This method includes software for the presentation of test words to the speaker and the collection of listener response data. The ability to repeat partial sections of a test is provided. The procedures used for the generation of the DOD Digital Voice Processing Consortium DRT/DAM Digital Master Library are given. This master library of source material for DRT/DAM testing of voice communication systems is discussed. Contents of the library are provided.

Tardelli, J. D.; Leblanc, J.; Gatewood, P. D.

1989-11-01

120

QUAWDS: A Composite Diagnostic System for Gait Analysis  

PubMed Central

QUAWDS is a system for analyzing human gait. QUAWDS integrates associational and qualitative models of knowledge into a diagnostic system, taking advantage of the tasks each kind of model can determine efficiently and effectively. An abductive assembler is used to coordinate the different models. The result is a diagnostic solution that is “locally best,” i.e, no single change to the answer will produce a better solution. We believe QUAWDS' architecture is suitable for many complex domains.

Weintraub, Michael A.; Bylander, Tom

1989-01-01

121

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

122

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

123

Development of an Instructional Information System Prototype for Use in the Teaching and Development of Nursing Diagnostic Skills  

PubMed Central

An interdisciplinary project was instituted in 1986 for the development and testing of an instructional system to be used in a nursing curriculum for teaching and developing the diagnostic skills of undergraduate nursing students. The system serves two major functions: to assist students in learning and becoming proficient in the diagnostic process and to assist educators in evaluating the students' learning.

Bloom, K. C.; Leitner, J. E.; Solano, J. L.

1988-01-01

124

RADC/EEV Diagnostic Rhyme Test System Improvements.  

National Technical Information Service (NTIS)

This report fully documents the current Diagnostic Rhyme Test (DRT) System used at RADC/EEV for the test and evaluation of the intelligibility of digital voice communication systems. All improvements to this system are presented in detail. This report is ...

J. LeBlanc J. D. Tardelli P. D. Gatewood

1989-01-01

125

Assessing the behavioral impact of a diagnostic decision support system.  

PubMed Central

This paper describes a prototype for research to evaluate the impact of diagnostic decision support systems on the behavior of physicians. Several indices that can be used to quantify the magnitude of impact are proposed. A large medical diagnostic knowledge base in internal medicine (the Iliad knowledge base) was used in this evaluation. The impact on behavior when different inference models are run against this knowledge base is evaluated for two different case domains and physician's specialties.

Li, Y. C.; Haug, P. J.; Lincoln, M. J.; Turner, C. W.; Pryor, T. A.; Warner, H. H.

1995-01-01

126

IT-based Diagnostic Instrumentation Systems for Personalized Healthcare Services  

Microsoft Academic Search

This paper describes recent research and development activities on the diagnostic instruments for personalized healthcare services in Seoul National University. Utilizing the state-of-the-art information technologies (IT), various diagnostic medical instruments have been integrated into a personal wearable device and a home telehealthcare system. We developed a wrist-worn integrated health monitoring device (WIHMD) which performs the measurements of non- invasive blood

Honggu CHUN; Jaemin KANG; Ki-jung KIM; Kwang Suk PARK; Hee Chan KIM

2005-01-01

127

Developing a self-diagnostic system for piezoelectric sensors  

NASA Astrophysics Data System (ADS)

Measurement techniques for developing a self-diagnostic system for piezoelectric sensors are presented. The self-diagnostic system uses two types of measurement techniques based on passive and active evaluation of the piezoelectric element. Both hard and soft failures can be detected by this system. Hard failures such as loss of sensor signal and change in sensor output resistance are determined by monitoring the sensor's output resistance, voltage or current. These are passive measurements of the sensor's output condition. Soft failures include changes in sensor calibration and mounting conditions. Soft failures are detected by measuring structural/electrical impedance of the piezoelectric sensor. Active measurement techniques are used to calculate changes in piezoelectric element properties related to soft failures. This paper describes the general operating principles of a self-diagnostic system and discusses the design of an active/passive measurement technique required for this system to function. Experimental results using two types of piezoelectric accelerometers are presented.

Flanagan, Patrick M.; Atherton, William J.

1990-07-01

128

Developing a self-diagnostic system for piezoelectric sensors  

NASA Technical Reports Server (NTRS)

Measurement techniques for developing a self-diagnostic system for piezoelectric sensors are presented. The self-diagnostic system uses two types of measurement techniques based on passive and active evaluation of the piezoelectric element. Both hard and soft failures can be detected by this system. Hard failures such as loss of sensor signal and change in sensor output resistance are determined by monitoring the sensor's output resistance, voltage or current. These are passive measurements of the sensor's output condition. Soft failures include changes in sensor calibration and mounting conditions. Soft failures are detected by measuring structural/electrical impedance of the piezoelectric sensor. Active measurement techniques are used to calculate changes in piezoelectric element properties related to soft failures. This paper describes the general operating principles of a self-diagnostic system and discusses the design of an active/passive measurement technique required for this system to function. Experimental results using two types of piezoelectric accelerometers are presented.

Flanagan, Patrick M.; Atherton, William J.

1990-01-01

129

Development of a New Diagnostic System for Human Liver Diseases Based on Conventional Ultrasonic Diagnostic Equipment  

NASA Astrophysics Data System (ADS)

In this paper, the authors present the experimental results of using a quantitative ultrasonic diagnosis technique for human liver diseases using the fractal dimension (FD) of the shape of the power spectra (PS) of RF signals. We have developed an experimental system based on a conventional ultrasonic diagnostic system. As a result, we show that normal livers, fatty livers and liver cirrhosis can be identified using the FD values.

Kikuchi, Tsuneo; Nakazawa, Toshihiro; Harada, Akimitsu; Sato, Hiroaki; Maruyama, Yukio; Sato, Sojun

2001-05-01

130

Pyrolysis System and Process.  

National Technical Information Service (NTIS)

A pyrolysis system and process for recovering energy from solid waste and other feedstocks containing hydrocarbons such as coal, asphalt, naphtha, cheap crude oils, etc. is described. The process is comprised of the following steps: continuously feeding t...

S. I. Cheng

1975-01-01

131

GammaKey system for improved diagnostics with gamma cameras.  

PubMed

We designed the GammaKey system for the acquisition, storage and analysis of images from semi-analogue gamma scintillation cameras (GSCs). The GammaKey system, operating on a standard PC, replicates the functionality of earlier dedicated computer systems, allows the exchange of data in the DICOM format and has an open architecture enabling the development of new diagnostic techniques. The main purpose of the GammaKey is to enable the continued use of old GSCs which have functional scintillation crystals, but also to permit data exchange with new digital GSCs. The GammaKey has been technically validated by standards established by the National Electrical Manufacturers Association. The GammaKey has been used for seven years in two leading centres for nuclear medicine in Serbia (the Clinical Center of Serbia, Belgrade, and the Clinical Center of Vojvodina, Novi Sad) in approximately 30,000 patients. Clinical application proves that the GammaKey is a robust and reliable system with high-quality image output. Data processing can be upgraded with non-standard features added on request as shown in two examples: (1) the testing of splenectomy efficacy in the case of thrombocytopenia with normal production; and (2) the detection and localisation of parathyroid adenomas. PMID:24845020

Jankovi?, Milica M; Pijetlovi?, Boris; Markovi?, Ana Koljevi?; Todorovi?-Tirnani?, Mila V; Beatovi?, Slobodanka Lj; Anti?, Vojislav; Odalovi?, Strahinja; Sekuli?, Stevan; Jorgovanovi?, Nikola; Popovi?, Dejan B

2014-07-01

132

Advanced Diagnostic System on Earth Observing One  

NASA Technical Reports Server (NTRS)

In this infusion experiment, the Livingstone 2 (L2) model-based diagnosis engine, developed by the Computational Sciences division at NASA Ames Research Center, has been uploaded to the Earth Observing One (EO-1) satellite. L2 is integrated with the Autonomous Sciencecraft Experiment (ASE) which provides an on-board planning capability and a software bridge to the spacecraft's 1773 data bus. Using a model of the spacecraft subsystems, L2 predicts nominal state transitions initiated by control commands, monitors the spacecraft sensors, and, in the case of failure, isolates the fault based on the discrepant observations. Fault detection and isolation is done by determining a set of component modes, including most likely failures, which satisfy the current observations. All mode transitions and diagnoses are telemetered to the ground for analysis. The initial L2 model is scoped to EO-1's imaging instruments and solid state recorder. Diagnostic scenarios for EO-1's nominal imaging timeline are demonstrated by injecting simulated faults on-board the spacecraft. The solid state recorder stores the science images and also hosts: the experiment software. The main objective of the experiment is to mature the L2 technology to Technology Readiness Level (TRL) 7. Experiment results are presented, as well as a discussion of the challenging technical issues encountered. Future extensions may explore coordination with the planner, and model-based ground operations.

Hayden, Sandra C.; Sweet, Adam J.; Christa, Scott E.; Tran, Daniel; Shulman, Seth

2004-01-01

133

Diagnostic Systems on the Pegasus Toroidal Experiment  

NASA Astrophysics Data System (ADS)

Measurement capabilities for the Pegasus ST are increasing to support the scientific studies of plasma behavior at very-low A. Global parameters are obtained from equilibrium reconstructions constrained by a magnetics set consisting of internal and external flux loops, a poloidal array of B-dot coils, and a diamagnetic loop. Pulse height analysis using a CCD detector will give a time-resolved electron temperature profile with a shotwise spatial scan. A tangentially viewing bolometer array measures profiles of radiated power. A 280 GHz single-chord microwave interferometer is used to measure line-averaged density, while a CCD-based visible bremsstrahlung array gives an approximate density profile. SPRED provides an impurity spectrum between 10-110 nm at 5 kHz. MHD activity is characterized by Mirnov coil arrays and an 18 channel poloidal soft x-ray array. The proposed next generation of diagnostics includes time-evolving density, temperature and current profiles using active neutral beam spectroscopy.

Diem, S. J.; Fonck, R. J.; Ford, B. A.; Garstka, G. D.; Khripin, K. Y.; Lewicki, B. T.; Ostrander, C. N.; Reinke, M. L.; Schooff, R. J.; Sontag, A. C.; Winz, G. R.

2002-11-01

134

Rough-Sets-Based Reduction for Analog Systems Diagnostics  

Microsoft Academic Search

This paper presents an application of the rough sets algorithms to the analog systems diagnostics. Multiple methods of discretization and reduction of the data sets obtained from measurements are tested to find effective combinations for di- agnostic purposes. Useful features of rough sets are identified. Versatility and scalability of the proposed method are verified, by application to multiple analog systems

Piotr Bilski; Jacek M. Wojciechowski

2011-01-01

135

Electrically heated particulate filter diagnostic systems and methods  

DOEpatents

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

136

High-energy laser plasma diagnostic system  

Microsoft Academic Search

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

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

2000-01-01

137

Systems diagnostics: anticipating the next generation of diagnostic tests based on mechanistic insight into disease.  

PubMed

Societal demand for faster and more accurate assignment of treatments is based in both patient care needs and in health economics. From a patient care standpoint, there needs to be a transformation from the empiric method of therapeutic decision making to avoid unwanted side effects from inefficacious treatments. For health economics, the delay in effective therapy and expenditures for ineffective therapies add to the burden of care. To accomplish this transformation, we need to modify our current method of classifying disease from a phenotypic description to one that incorporates the different molecular drivers that created the observed phenotype. To do so, a deeper, systems-based understanding of these disease drivers is required, which will yield a new generation of diagnostic tests, or systems diagnostics. PMID:23872468

Fryburg, David A; Song, Diane H; Laifenfeld, Daphna; de Graaf, David

2014-02-01

138

Diagnostic neutral beam injector and associated diagnostic systems for the TJ-II stellarator device  

NASA Astrophysics Data System (ADS)

A diagnostic neutral beam injector, based on the DINA-5F injector, is under development for the highly flexible TJ-II stellarator. The principal goals are to obtain spatially resolved charge-exchange recombination spectroscopy and neutral particle analysis measurements along the plasma minor radius and to stimulate opportunities for new physics studies. We first summarize relevant TJ-II characteristics and the considerations addressed when defining this compact system, for instance, the steps taken to minimize the impact of ferromagnetic shielding on magnetic configurations. We then outline the main aspects of the system and associated diagnostics. In particular, we highlight a bidirectional fiber-optic based multichannel spectrometer for obtaining Doppler measurements with high spatial resolution.

McCarthy, K. J.; Balbín, R.; López-Fraguas, A.; García, A.; Carmona, J. M.; Sánchez, J.; Ivanov, A. A.

2004-10-01

139

DECISION-SUPPORT SYSTEM FOR DIAGNOSTICS RESEARCH  

EPA Science Inventory

In Phase 1 of this research, we will identify existing tools, methods, and models available to support establishment of cause-effect relationships. In Phase 2, we will investigate existing decision support systems and produce an appropriate decision support system design. Based ...

140

Rating Scales in the Diagnostic Process of Alcohol Dependence and Related Disorders  

Microsoft Academic Search

A review is given of rating scales used in the diagnostic process of alcohol dependency and related disorders. Screening and assessment are seen as the two major goals of this diagnostic process. After some comments on the question of how adequate rating scales should be construed and what kind of criteria should be applied to evaluate their usefulness, alcohol-specific as

Arthur Günthner; Friedhelm Stetter

1996-01-01

141

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

142

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

143

Correlating Log Messages for System Diagnostics  

SciTech Connect

In large-scale computing systems, the sheer volume of log data generated presents daunting challenges for debugging and monitoring of these systems. The Oak Ridge Leadership Computing Facility s premier simulation platform, the Cray XT5 known as Jaguar, can generate a few hundred thousand log entries in less than a minute for many system level events. Determining the root cause of such system events requires analyzing and interpretation of a large number of log messages. Most often, the log messages are best understood when they are interpreted collectively rather than individually. In this paper, we present our approach to interpreting log messages by identifying their commonalities and grouping them into clusters. Given a set of log messages within a time interval, we group the messages based on source, target, and/or error type, and correlate the messages with hardware and application information. We monitor the Lustre log messages in the XT5 console log and show that such grouping of log messages assists in detecting the source of system events. By intelligent grouping and correlation of events in the log, we are able to provide system administrators with meaningful information in a concise format for root cause analysis.

Gunasekaran, Raghul [ORNL] [ORNL; Dillow, David A [ORNL] [ORNL; Shipman, Galen M [ORNL] [ORNL; Maxwell, Don E [ORNL] [ORNL; Hill, Jason J [ORNL] [ORNL; Park, Byung H [ORNL] [ORNL; Geist, Al [ORNL] [ORNL

2010-01-01

144

[Scheimpflug and topography systems in ophthalmologic diagnostics].  

PubMed

Modern Ophthalmology is currently experiencing a boom in anterior segment analysis tools that can increasingly gather information with one short measurement. These systems are based e.g. on so-called Scheimpflug (Pentacam, Galilei), slitlamp, and Placido technologies (Orbscan IIz) and other measurement systems. They help in analyzing the cornea in detail, including calculation of corneal wavefront. In addition, morphological and anatomical parameters such as anterior chamber depth, pachymetry, chamber angle, and lens densitometry can be analyzed. That makes these new technologies of interest for refractive surgery as well as for screening procedures such as Glaucoma, Keratoconus and others. This survey focuses on the two models, Oculus Pentacam and B&L Orbscan IIz as representative of all the other systems, as they are the most successful machines in this field. PMID:18751984

Auffarth, G U; Borkenstein, A F M; Ehmer, A; Mannsfeld, A; Rabsilber, T M; Holzer, M P

2008-09-01

145

A diagnostic system that learns from experience.  

PubMed Central

LiverSoar is a flexible knowledge-based system that can learn from its problem-solving experience in individual cases. Within an opportunistic abductive framework, it can diagnose liver diseases from findings in liver tissue biopsies. As more cases are encountered and more recognition knowledge is acquired, the system becomes prepared for most of the usual cases, hence solves them with less problem-solving effort. At the same time, it stays flexible enough to fall back to deliberative problem solving in more unusual cases if the acquired knowledge does not apply.

Bayazitoglu, A.; Smith, J. W.; Johnson, T. R.

1992-01-01

146

Nanocrystalline-oxide ceramics: Synthesis, diagnostics, and processing  

NASA Astrophysics Data System (ADS)

A flat-flame combustion process is employed to synthesize oxide-ceramic powder with nanoparticle size. An extensive study is made of the influence of processing parameters on final particle size. The parameters include precursor feed rate, burner-to-chill distance, chamber pressure, and location in the reaction chamber. Laser induced fluorescence is used as an in-situ diagnostic tool to obtain information on precursor concentration, the extent of precursor decomposition, particle formation, and temperature profiles. It is found that the precursor feed rate affects the precursor decomposition rate, and that most of the precursor decomposition is complete at one third of the burner-to-chill distance. Evidence for nanoparticle formation, which immediately follows precursor decomposition, is obtained from visible light emission. The effect of the chill is to establish a fixed aspect ratio (burner diameter to burner-to-chill distance) and to ensure one-dimensional flow. Decomposition of the precursor is complete within the stand-off distance, while particle coalescence is the main feature outside the burner region. A non-agglomerated nanopowder with particle size ranging from several to tens of nanometers is easily obtained using the flat-flame combustion process. After the optimum powder processing conditions are established, the as-synthesized powder is collected and used as starting material for a sintering study. A torroidal type of high pressure apparatus is used to sinter the green compacts, using a wide range of sintering conditions up to 8GPa and 2000°C. To sinter the nanopowder into single-phase material, while maintaining nano-sized grains, pressures in the GPa range are required to close the pores, because of the small pore size and associated high curvature. In the sintering of nanoparticles involving a phase transformation, accompanied by a reduced molar volume, pressure acts as a nucleation promoter. By applying high pressure, the sintering temperature is reduced without interfering with the nucleation rate, while the grain growth rate is diminished. However, high pressure beyond a critical value is not significant in reducing grain size. A theoretical model is developed to explain the variation in grain size with applied pressure and temperature. At constant temperature, the nucleation barrier is reduced with increasing pressure in the GPa range, whereas the difference in Gibbs free energy per unit volume induced by pressure is comparable to the initial value, which reverses the trend of reducing the nucleation barrier. For aluminum oxide ceramic, the optimum sintering regime is determined to be 5 GPa and 600°C. A final grain size of 43 nm is obtained in 15 minutes, with density 99% of the theoretical value. To the best of our knowledge, this is the first demonstration of the fabrication of a nano-grained ceramic material by sintering, such that the grain size is <50 nm.

Chen, Yi-Jia

147

Radio frequency diagnostics for plasma etch systems  

Microsoft Academic Search

Using control hardware and software connected to a personal computer, on-line measurements of the state of a plasma etcher can be used to integrate mathematical models, control algorithms, and equipment communications in a plasma etcher in order to develop a real-time monitoring and control system. Sensors available on the reactor include electrical probes for monitoring the rf voltage and rf

Scott Bushman; Thomas F. Edgar; Isaac Trachtenberg; Norman Williams

1994-01-01

148

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

149

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

150

Industrial Process Surveillance System  

DOEpatents

A system and method 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.

Gross, Kenneth C. (Bolingbrook, IL); Wegerich, Stephan W (Glendale Heights, IL); Singer, Ralph M. (Naperville, IL); Mott, Jack E. (Idaho Falls, ID)

2001-01-30

151

Industrial process surveillance system  

DOEpatents

A system and method 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.

Gross, Kenneth C. (Bolingbrook, IL); Wegerich, Stephan W. (Glendale Heights, IL); Singer, Ralph M. (Naperville, IL); Mott, Jack E. (Idaho Falls, ID)

1998-01-01

152

The Operationalized Psychodynamic Diagnostics System: Clinical Relevance, Reliability and Validity  

Microsoft Academic Search

In this paper, we present a multiaxial system for psychodynamic diagnosis, which has attained wide usage in Germany in the last 10 years. First we will discuss the 4 operationalized psychodynamic diagnostics (OPD) axes: illness experience and treatment assumptions, relationships, mental conflicts, and structure, then clinical applications will be outlined. Focus psychodynamic formulations can be employed both with inpatients and

M. Cierpka; T. Grande; G. Rudolf; M. von der Tann; M. Staschf

2007-01-01

153

Aerospike Engine Post-Test Diagnostic System Delivered to Rocketdyne.  

National Technical Information Service (NTIS)

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 an...

C. M. Meyer

2000-01-01

154

GIS diagnostics: thermal imaging systems used for poor contact detection  

Microsoft Academic Search

The reliability of GIS is very high but any failure that occurs can cause extensive damage result and the repair times are considerably long. The consequential losses to system security and economically can be high, especially if the nominal GIS voltage is 420 kV and above. In view of these circumstances, increasing attention is being given to diagnostic techniques for

Doron Avital; V. Brandenbursky; A. Farber

2004-01-01

155

Diagnostic System for Rapid and Sensitive Differential Detection of Pathogens  

PubMed Central

Naturally emerging and deliberately released pathogens demand new detection strategies to allow early recognition and containment. We describe a diagnostic system for rapid, sensitive, multiplex discrimination of microbial gene sequences and report its application for detecting 22 respiratory pathogens in clinical samples.

Briese, Thomas; Palacios, Gustavo; Kokoris, Mark; Jabado, Omar; Liu, Zhiqiang; Renwick, Neil; Kapoor, Vishal; Casas, Inmaculada; Pozo, Francisco; Limberger, Ron; Perez-Brena, Pilar; Ju, Jingyue

2005-01-01

156

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.

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

2013-01-01

157

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

158

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

159

A modern diagnostic approach for automobile systems condition monitoring  

NASA Astrophysics Data System (ADS)

An important topic in automotive research and development is the area of active and passive safety systems. In general, it is grouped in active safety systems to prevent accidents and passive systems to reduce the impact of a crash. An example for an active system is ABS while a seat belt tensioner represents the group of passive systems. Current developments in the automotive industry try to link active with passive system components to enable a complete event sequence, beginning with the warning of the driver about a critical situation till the automatic emergency call after an accident. The cross-linking has an impact on the current diagnostic approach, which is described in this paper. Therefore, this contribution introduces a new diagnostic approach for automotive mechatronic systems. The concept is based on monitoring the messages which are exchanged via the automotive communication systems, e.g. the CAN bus. According to the authors' assumption, the messages on the bus are changing between faultless and faulty vehicle condition. The transmitted messages of the sensors and control units are different depending on the condition of the car. First experiments are carried and in addition, the hardware design of a suitable diagnostic interface is presented. Finally, first results will be presented and discussed.

Selig, M.; Shi, Z.; Ball, A.; Schmidt, K.

2012-05-01

160

Transparent Materials Processing System.  

National Technical Information Service (NTIS)

A zero gravity processing furnace system was designed that will allow acquisition of photographic or other visual information while the sample is being processed. A low temperature (30 to 400 C) test model with a flat specimen heated by quartz-halide lamp...

J. S. Hetherington

1977-01-01

161

Multimedia Processing Systems  

Microsoft Academic Search

An overview on VLSI implementations of multimedia pro- cessing systems is given with particular emphasis on architectures for im- age and video processing. Alternative design approaches are discussed for dedicated image and video processing circuits and for programmable multimedia processors. Current design examples of dedicated and pro- grammable architectures are reviewed, and the techniques employed to im- prove the performance

Peter Pirsch; Hans-Joachim Stolberg

162

Combining principles of Cognitive Load Theory and diagnostic error analysis for designing job aids: Effects on motivation and diagnostic performance in a process control task.  

PubMed

Two studies are presented in which the design of a procedural aid and the impact of an additional decision aid for process control were assessed. In Study 1, a procedural aid was developed that avoids imposing unnecessary extraneous cognitive load on novices when controlling a complex technical system. This newly designed procedural aid positively affected germane load, attention, satisfaction, motivation, knowledge acquisition and diagnostic speed for novel faults. In Study 2, the effect of a decision aid for use before the procedural aid was investigated, which was developed based on an analysis of diagnostic errors committed in Study 1. Results showed that novices were able to diagnose both novel faults and practised faults, and were even faster at diagnosing novel faults. This research contributes to the question of how to optimally support novices in dealing with technical faults in process control. PMID:23017295

Kluge, Annette; Grauel, Britta; Burkolter, Dina

2013-03-01

163

A fuzzy logic intelligent diagnostic system for spacecraft integrated vehicle health management  

NASA Technical Reports Server (NTRS)

Due to the complexity of future space missions and the large amount of data involved, greater autonomy in data processing is demanded for mission operations, training, and vehicle health management. In this paper, we develop a fuzzy logic intelligent diagnostic system to perform data reduction, data analysis, and fault diagnosis for spacecraft vehicle health management applications. The diagnostic system contains a data filter and an inference engine. The data filter is designed to intelligently select only the necessary data for analysis, while the inference engine is designed for failure detection, warning, and decision on corrective actions using fuzzy logic synthesis. Due to its adaptive nature and on-line learning ability, the diagnostic system is capable of dealing with environmental noise, uncertainties, conflict information, and sensor faults.

Wu, G. Gordon

1995-01-01

164

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

165

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

166

Optical diagnostics integrated with laser spark delivery system  

DOEpatents

A spark delivery system for generating a spark using a laser beam is provided, and includes a laser light source and a laser delivery assembly. The laser delivery assembly includes a hollow fiber and a launch assembly comprising launch focusing optics to input the laser beam in the hollow fiber. The laser delivery assembly further includes exit focusing optics that demagnify an exit beam of laser light from the hollow fiber, thereby increasing the intensity of the laser beam and creating a spark. Other embodiments use a fiber laser to generate a spark. Embodiments of the present invention may be used to create a spark in an engine. Yet other embodiments include collecting light from the spark or a flame resulting from the spark and conveying the light for diagnostics. Methods of using the spark delivery systems and diagnostic systems are provided.

Yalin, Azer (Fort Collins, CO) [Fort Collins, CO; Willson, Bryan (Fort Collins, CO) [Fort Collins, CO; Defoort, Morgan (Fort Collins, CO) [Fort Collins, CO; Joshi, Sachin (Fort Collins, CO) [Fort Collins, CO; Reynolds, Adam (Fort Collins, CO) [Fort Collins, CO

2008-09-02

167

Development of Visual Diagnostic Expertise in Pathology - An Information-processing Study  

PubMed Central

Objective: To identify key features contributing to trainees’ development of expertise in microscopic pathology diagnosis, a complex visual task, and to provide new insights to help create computer-based training systems in pathology. Design: Standard methods of information-processing and cognitive science were used to study diagnostic processes (search, perception, reasoning) of 28 novices, intermediates, and experts. Participants examined cases in breast pathology; each case had a previously established gold standard diagnosis. Videotapes correlated the actual visual data examined by participants with their verbal “think-aloud” protocols. Measurements: Investigators measured accuracy, difficulty, certainty, protocol process frequencies, error frequencies, and times to key diagnostic events for each case and subject. Analyses of variance, chi-square tests and post-hoc comparisons were performed with subject as the unit of analysis. Results: Level of expertise corresponded with differences in search, perception, and reasoning components of the tasks. Several discrete steps occur on the path to competence, including development of adequate search strategies, rapid and accurate recognition of anatomic location, acquisition of visual data interpretation skills, and transitory reliance on explicit feature identification. Conclusion: Results provide the basis for an empirical cognitive model of competence for the complex tasks of microscopic pathology diagnosis. Results will inform the development of computer-based pedagogy tools in this domain

Crowley, Rebecca S.; Naus, Gregory J.; Stewart, Jimmie; Friedman, Charles P.

2003-01-01

168

TED-Turbine Engine Diagnostics: an expert diagnostic system for the M1 Abrams AGT1500 turbine engine  

Microsoft Academic Search

TED (Turbine Engine Diagnostics) is a diagnostic expert system to aid the M1 Abrams' mechanic find and fix problems in the AGT1500 turbine engine. TED was designed and built by the US Army Research Laboratory and the US Army Ordnance Center. Limited fielding was begun in July 1994 to selected National Guard Units, with eventual fielding to 28 National Guard

Richard Helfman; J. Dumer; T. Hanratty

1995-01-01

169

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

170

Medical diagnostic imaging support systems for military medicine  

NASA Astrophysics Data System (ADS)

The Surgeon's General of the military services created the Medical Diagnostic Imaging Support (MDIS) project to exploit the results of extensive imaging research efforts over the past ten years. The MDIS project will achieve the objective of implementing filmless medical imaging systems at several military medical treatment facilities over the next 4 years. Filmless medical imaging systems must be presented to decision makers via strategic principles to foster support. MDIS is a superior alternative for health care delivery when compared to film- based image management systems which are inherently limited by film as a hard copy media. Four enabling core technologies make it possible to system integrate an effective filmless system for military medicine. These filmless MDIS systems will be acquired from industry through a contracting approach that (1) functionally describes subsystem and system performance for acceptable clinical operations, (2) validates proposed systems through performance evaluation, and (3) makes a system selection and contract award that based on best value for the government.

Goeringer, Fred

1991-05-01

171

Transparent materials processing system  

NASA Technical Reports Server (NTRS)

A zero gravity processing furnace system was designed that will allow acquisition of photographic or other visual information while the sample is being processed. A low temperature (30 to 400 C) test model with a flat specimen heated by quartz-halide lamps was constructed. A high temperature (400 to 1000 C) test model heated by resistance heaters, utilizing a cylindrical specimen and optics, was also built. Each of the test models is discussed in detail. Recommendations are given.

Hetherington, J. S.

1977-01-01

172

Supervisory control and diagnostics system for the mirror fusion test facility: overview and status 1980  

SciTech Connect

The Mirror Fusion Test Facility (MFTF) is a complex facility requiring a highly-computerized Supervisory Control and Diagnostics System (SCDS) to monitor and provide control over ten subsystems; three of which require true process control. SCDS will provide physicists with a method of studying machine and plasma behavior by acquiring and processing up to four megabytes of plasma diagnostic information every five minutes. A high degree of availability and throughput is provided by a distributed computer system (nine 32-bit minicomputers on shared memory). Data, distributed across SCDS, is managed by a high-bandwidth Distributed Database Management System. The MFTF operators' control room consoles use color television monitors with touch sensitive screens; this is a totally new approach. The method of handling deviations to normal machine operation and how the operator should be notified and assisted in the resolution of problems has been studied and a system designed.

McGoldrick, P.R.

1981-01-01

173

Needs assessment for diagnostic decision support systems (DDSS).  

PubMed Central

Diagnostic decision support systems are often developed without a clear idea of how well the system will meet the needs of its users. The present study was designed to assess the information needs of clinicians. A set of questions submitted to an information service by family physicians was used to determine how much need there was for diagnostic decision support, the types of support needed, and the general content areas of their questions. Results showed that less than half of the questions were related to diagnosis and that most of those were requests for general information about a given condition. In addition, the fewest diagnosis questions were for conditions that were seen frequently in ambulatory care in a survey of family practitioners.

Berner, E. S.; Shugerman, A. A.

1991-01-01

174

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

175

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

176

Radial diagnostics in the system of ecological monitoring in trauma  

NASA Astrophysics Data System (ADS)

Both creating of effective identification and evaluation mechanisms of environmental factors hazardous for health, and revealing their influence degree on the human health play an important role in ecological monitoring. The grate importance in a solution of many ecological problems belongs to medicine, first of all, to its social-preventive brunch. In this reference trauma remains the extremely important problem. Annually more than 10 million persons sustain traumas. Alongside with occupational, transport trauma, a significant number of trauma cases occur due to the impact of various ecological factors, including natural disasters, mass poisonings and other reasons. Trauma results in severe changes in human body organs and systems; the timely detection and correct evaluation of these changes are the key points for the choice of treatment. Among diagnostic methods used for this purpose, the methods of radial diagnostics play an important role. Various radial methods-- x-ray, radionuclide, ultrasonic, magnetic resonance imaging, computer tomography (CT)--are used to detect the functional and structural changes of vital organs and systems in trauma. Each of these methods has its advantages and shortages. The reported study was devoted to the analysis of using the photon systems (gamma-camera and computer tomography) in application of radionuclide and CT methods of radial diagnostics in trauma.

Siniakova, Olga G.; Ishmuhametov, Airat I.; Proscurina, Gulnar B.; Sharifullin, Faad A.

1997-08-01

177

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

178

Quartz resonator processing system  

DOEpatents

Disclosed is a single chamber ultra-high vacuum processing system for the oduction of hermetically sealed quartz resonators wherein electrode metallization and sealing are carried out along with cleaning and bake-out without any air exposure between the processing steps. The system includes a common vacuum chamber in which is located a rotatable wheel-like member which is adapted to move a plurality of individual component sets of a flat pack resonator unit past discretely located processing stations in said chamber whereupon electrode deposition takes place followed by the placement of ceramic covers over a frame containing a resonator element and then to a sealing stage where a pair of hydraulic rams including heating elements effect a metallized bonding of the covers to the frame.

Peters, Roswell D. M. (Rustburg, VA)

1983-01-01

179

Signal processing of spectroscopic data for engine diagnostic applications  

NASA Technical Reports Server (NTRS)

A description is given of research based on a series of spectra taken from the Diagnostic Test Facility (DTF) plume at NASA-Stennis Space Center. The DTF was designed to obtain spectra scaling approximately to that of the SSME, yet allow full control of dopant and thruster conditions. DTF spectra were used in this research to develop a technique for quantitative identification of an alloy. A mathematically based identification technique was tried, with reasonable sucess for one-element alloys, and only fair success for a two-element alloy. This approach was found to have the simplicity required for DSP implementation, thus allowing real-time diagnosis as a possibility. Spreadsheets were organized to handle the proliferation of development equations required, which number about 50,000. The identification work reinforced the presence of nonlinearity to dopant level.

Nail, Bert; Gardner, Donald; Wu, S. T.

1990-01-01

180

[Development of expert diagnostic system for common respiratory diseases].  

PubMed

Objective:To develop an internet-based expert diagnostic system for common respiratory diseases. Methods:SaaS system was used to build architecture; pattern of forward reasoning was applied for inference engine design; ASP.NET with C# from the tool pack of Microsoft Visual Studio2005 was used for website-interview medical expert system.The database of the system was constructed with Microsoft SQL Server 2005. Results:The developed expert system contained large data memory and high efficient function of data interview and data analysis for diagnosis of various diseases.The users were able to perform this system to obtain diagnosis for common respiratory diseases via internet. Conclusion:The developed expert system may be used for internet-based diagnosis of various respiratory diseases,particularly in telemedicine setting. PMID:24782386

Xu, Wei-Hua; Chen, You-Ling; Yan, Zheng

2014-03-01

181

Alarm Processing System  

SciTech Connect

During power plant transients, a control room operator is deluged with large amounts of diverse information of varying degrees of importance and in different format. Control room operators are sometimes overwhelmed. They are required to make quick decisions based on operating procedures thereby bypassing most deep-level reasoning. The application of expert systems to process alarms and to perform diagnosis can substantially improve the quality of information presented to operators. The high-level goal of the Alarm Processing System is for operators to enthusiastically accept a new technology that will improve their response to alarms during plant transient conditions. The Alarm Processing System dynamically prioritizes alarms based on the state of the plant; reduces the amount of information presented to the operator by grouping and displaying alarms in accordance with the present state of the plant; and allows nuisance alarms to be suppressed. Object-oriented programming techniques are used to describe plant analog and binary sensors, alarms, and plant states. The system reasons about nuisance signals taken off-line by using logic system that has three states: true, false, and null. A null or invalid state is propagated through the logic until the operator can assign a derived value for the signal. 5 refs., 7 figs.

Di Domenico, P.; Mah, E. (Bechtel National, Inc., San Francisco, CA (USA)); Corsberg, D. (EG and G Idaho, Inc., Idaho Falls, ID (USA)); Somsel, J. (Pacific Gas and Electric Co., San Francisco, CA (USA)); Chan, J.K. (Bechtel Power Corp., San Francisco, CA (USA)); Naser, J. (Electric Power Research Inst., Palo Alto, CA (USA)); Scarl, E. (Boeing Computer Services Co., Seattle, WA (USA))

1989-01-01

182

A local area network diagnostic assistant expert system  

SciTech Connect

We are currently developing a stand-alone Local Area Network (LAN) Diagnostic Assistant expert system to assist system managers in diagnosing network-related hardware and software malfunctions. The goal of this system is to aid in identifying malfunctions associated with a single workstation, a group of workstations, communications between workstations, and general statements of the ''Ethernet not working'' type of problems. The system consists of a geographical editor for data entry and modification of LAN information and a diagnostic environment for solving problems. Much work has been done in laying the initial framework for the system in the areas of LAN representation, the problem-solving strategy, and the user interface. We used a hierarchical frame-based representation for the LAN. Information for the strategy mechanism was gathered through case studies and background information. Ideas from heuristic classification were incorporated into the strategy mechanism. As in any system development, a majority of the time was spent developing a good user interface. We used graphics renditions wherever natural and minimized keyboard input by using mouse-selectable buttons and menus. Currently, a prototype version of the system is available that assists with some single-workstation problems. 7 refs., 10 figs.

Mniszewski, S.M.; Peter, E.A.; Lloyd, S.C.

1988-01-01

183

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

184

Commissioning results of the APS storage ring diagnostics systems  

SciTech Connect

Initial commissionings of the Advanced Photon Source (APS) 7-GeV storage ring and its diagnostics systems have been done. Early studies involved single-bunch measurements for beam transverse size ({sigma}{sub x} {approx} 150 {mu}m, {sigma}{sub y} {approx} 50 {mu}m), current, injection losses, and bunch length. The diagnostics have been used in studies related to the detection of an extra contribution to beam jitter at {approximately} 6.5 Hz frequency; observation of bunch lengthening ({sigma} {approx} 30 to 60 ps) with single-bunch current; observation of an induced vertical, head-tail instability; and detection of a small orbit change with insertion device gap position. More recently, operations at 100-mA stored-beam current, the baseline design goal, have been achieved with the support of beam characterizations.

Lumpkin, A.H.

1996-12-31

185

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

186

21 CFR 1020.30 - Diagnostic x-ray systems and their major components.  

Code of Federal Regulations, 2010 CFR

...2009-04-01 false Diagnostic x-ray systems and their major components...PRODUCTS § 1020.30 Diagnostic x-ray systems and their major components...The following components of diagnostic x-ray systems: (A) Tube housing...

2009-04-01

187

21 CFR 1020.30 - Diagnostic x-ray systems and their major components.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Diagnostic x-ray systems and their major components...PRODUCTS § 1020.30 Diagnostic x-ray systems and their major components...The following components of diagnostic x-ray systems: (A) Tube housing...

2010-04-01

188

IT-based diagnostic instrumentation systems for personalized healthcare services.  

PubMed

This paper describes recent research and development activities on the diagnostic instruments for personalized healthcare services in Seoul National University. Utilizing the state-of-the-art information technologies (IT), various diagnostic medical instruments have been integrated into a personal wearable device and a home telehealthcare system. We developed a wrist-worn integrated health monitoring device (WIHMD) which performs the measurements of non-invasive blood pressure (NIBP), pulse oximetry (SpO2), electrocardiogram (ECG), respiration rate, heart rate, and body surface temperature and the detection of falls to determine the onset of emergency situation. The WIHMD also analyzes the acquired bio-signals and transmits the resultant data to a healthcare service center through a commercial cellular phone. Two different kinds of IT-based blood glucometer have been developed using a cellular phone and PDA(personal digital assistant) as a main unit. A blood glucometer was also integrated within a wrist pressure measurement module which is interfaced with a cellular phone via Telecommunications Technology Association (TTA) standard in order to provide users with easiness in measuring and handling two important health parameters. Non-intrusive bio-signal measurement systems were developed for the ease of home use. One can measure his ECG on a bed while he is sleeping; measure his ECG, body temperature, bodyfat ratio and weight on a toilet seat; measure his ECG on a chair; and estimate the degree of activity by motion analysis using a camera. Another integrated diagnostic system for home telehealthcare services has been developed to include a 12 channels ECG, a pressure meter for NIBP, a blood glucometer, a bodyfat meter and a spirometer. It is an expert system to analyze the measured health data and based on the diagnostic result, the system provides an appropriate medical consultation. The measured data can be either stored on the system or transmitted to the central server through the internet. We have installed the developed systems on a model house for the performance evaluation and confirmed the possibility of the system as an effective tool for the personalized healthcare services. PMID:16282668

Chun, Honggu; Kang, Jaemin; Kim, Ki-Jung; Park, Kwang Suk; Kim, Hee Chan

2005-01-01

189

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

190

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

191

Diagnostic Analysis of Space-Time Branching Processes for Earthquakes  

Microsoft Academic Search

It is natural to use a branching process to describe occurrence patterns of earthquakes, which are apparently clustered in both space and time. The clustering features of earthquakes are important for seismological studies.

Jiancang Zhuang; Yosihiko Ogata; David Vere-Jones

192

The Rare Earth Peak: An Overlooked r-Process Diagnostic  

NASA Astrophysics Data System (ADS)

Where do the heavy elements in the universe come from? While the basic principles of nucleosynthesis have been established, a definite answer to this and many related questions still eludes us. The 'rapid' neutron capture process or r-process is believed to be responsible for generating roughly half the nuclei with atomic mass A ? 100. However, the astrophysical site of this process still remains uncertain. Still further, nucleosynthesis calculations of this process must rely on theoretical extrapolations as the bulk of nuclides participating in this process are short-lived.We examine the formation and final structure of the rare earth peak (A ˜ 160) of the r-process nucleosynthesis. Since rare earth peak formation does not occur during (n, gamma) ? (gamma, n) equilibrium it is sensitive to the strong interplay between late time thermodynamic evolution and nuclear physics input. We show that under high entropy conditions (S > 100 kB), the rare earth peak forms at late times in the r-process after neutron exhaustion (neutron-to-seed ratio unity or R = 1) as matter decays back to stability. Depending on the conditions the peak forms either because of the pattern of the neutron capture rates or because of the pattern of the separation energies. We use features of a successful rare earth region to 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. We study the sensitivity of the r-process abundance pattern to neutron capture rates and beta-decay rates in the region. We identify the range of nuclei which are in uential in rare earth peak formation.

Mumpower, Matthew Ryan

193

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.

Arriens, Cristina; Mohan, Chandra

2014-01-01

194

Ultrasonic and Nuclear Magnetic Resonance for non-destructive diagnostics of cable systems  

Microsoft Academic Search

Due to mechanical, thermal and electrical stress non-reversible damages of the morphological texture can occur in polymeric materials used in cable systems (mainly polyethylene and silicone rubber). Reasons for the preceding damaging are for example included gas-filled microvoids and local inhomogeneities of the cross-linking-density. Considering the consequences of these processes, effective diagnostic methods are currently required, which have to fulfill

C. Cornelissen; A. Wiesmath; A. Schnettler; B. Bliimich

2003-01-01

195

Downstream electron beam exciter diagnostic with energy dependent cross section responses for process tool applications  

NASA Astrophysics Data System (ADS)

Optical emission spectroscopy (OES) still remains as the primary diagnostic in plasma process tools in micro-electronics industry. With newer plasma processes and detection demands in low open area etches, process monitoring with direct optical signals is severely limited. Here we present a diagnostic method that realizes optical signals due to an electron beam from an inductively coupled plasma. Distinct merits such as energy dependent optical emission cross section responses and stable operability in polymerizing / corrosive etch environments will be presented. Electron impact optical cross section responses of transitions in fluorocarbon, oxygen and inert gas chemistries will be shown. Such controllability, in the context of species density measurement will be discussed.

Thamban, P. L. Stephan; Padron Wells, Gabriel; Hosch, Jimmy; Goeckner, Matthew

2011-10-01

196

[The diagnostic process and how to teach it].  

PubMed

The subject of the present study is the teaching of the ability of diagnosing to nursing students. It has the general objective of verifying the adequacy of the elaboration of the analysis and synthesis process and its relation to the establishment of nursing diagnosis. After the development of the programmatic content of the Medical Nursing Discipline, students individually elaborated, facing a hypothetic situation, the diagnosis process (RISNER, 1986), obtaining a total of 106 diagnosis formulations (Taxonomy I of North American Nursing Diagnosis Association). The major difficulties were in the areas of "the establishment of relations and "data clustering". Authors suggest the stimulation of the development of the process of thinking inherent to analysis and synthesis since the beginning of undergraduate course. PMID:8716339

de Carvalho, E C; Bachion, M M; Ferraz, A E; Veiga, E V; Ruffino, M C; Robazzi, M L

1996-04-01

197

F100 engine diagnostic system status to date  

NASA Technical Reports Server (NTRS)

An engine diagnostic system, proposed for the F100 engine, was tested in five specially modified Tactical Air Command F-15 aircraft during a 16-month flight evaluation. After more than 3300 engine operating hours encompassing almost 900 flights during the flight evaluation, these aircraft provided a data base, still being analyzed, that has shown successful demonstration of the original functional characteristics. Four general design requirements, recording engine operating time/low cycle fatigue event detection, engine trim, and trend and performance data collection were demonstrated. Also, validation of maintenance actions taken and indicated needed maintenance were successfully demonstrated.

Boyless, J. A.

1981-01-01

198

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

199

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

200

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

201

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

202

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

203

A Diagnostic System for Improving Biomass Quality Based on a Sensor Network  

PubMed Central

Losses during storage of biomass are the main parameter that defines the profitability of using preserved biomass as feed for animal husbandry. In order to minimize storage losses, potential changes in specific physicochemical properties must be identified to subsequently act as indicators of silage decomposition and form the basis for preventive measures. This study presents a framework for a diagnostic system capable of detecting potential changes in specific physicochemical properties, i.e., temperature and the oxygen content, during the biomass storage process. The diagnostic system comprises a monitoring tool based on a wireless sensors network and a prediction tool based on a validated computation fluid dynamics model. It is shown that the system can provide the manager (end-user) with continuously updated information about specific biomass quality parameters. The system encompasses graphical visualization of the information to the end-user as a first step and, as a second step, the system identifies alerts depicting real differences between actual and predicted values of the monitored properties. The perspective is that this diagnostic system will provide managers with a solid basis for necessary preventive measures.

Bochtis, Dionysis D.; S?rensen, Claus G.; Green, Ole; Bartzanas, Thomas

2011-01-01

204

Control of Multibunch Longitudinal Instabilities and Beam Diagnostics Using a DSP-based Feedback System  

SciTech Connect

A bunch-by-bunch longitudinal feedback system has been designed and built to control coupled-bunch instabilities in the PEP-II machine. A prototype system has been installed at the Advanced Light Source at LBNL. Programmable DSPs allow longitudinal feedback processing in conjunction with data acquisition or instrumentation algorithms. Here the authors describe techniques developed for different beam and system diagnostics, such as measurements of the modal growth and damping rates and measurements of the bunch-by-bunch currents. Results from the Advanced Light Source are presented to illustrate these techniques.

Teytelman, Dmitry

2000-03-30

205

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

206

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

207

Mining association rules from clinical databases: an intelligent diagnostic process in healthcare.  

PubMed

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 a set of items. The algorithm that was implemented is a basic algorithm for mining association rules, known as a priori. In Healthcare, association rules are considered to be quite useful as they offer the possibility to conduct intelligent diagnosis and extract invaluable information and build important knowledge bases quickly and automatically. The problem of identifying new, unexpected and interesting patterns in medical databases in general, and diabetic data repositories in specific, is considered in this paper. We have applied the a priori algorithm to a database containing records of diabetic patients and attempted to extract association rules from the stored real parameters. The results indicate that the methodology followed may be of good value to the diagnostic procedure, especially when large data volumes are involved. The followed process and the implemented system offer an efficient and effective tool in the management of diabetes. Their clinical relevance and utility await the results of prospective clinical studies currently under investigation. PMID:11604957

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

2001-01-01

208

System Theory in Medical Diagnostic Devices: An Overview  

Microsoft Academic Search

Medical diagnostics refers to testing conducted either in vitro or in vivo to provide critical health care information for risk assessment, early diagnosis, treatment, or disease management. Typical in vivo diagnostic tests include the computed tomography scan, magnetic resonance imaging, and blood pressure screening. Typical in vitro diagnostic tests include cholesterol, Papanicolaou smear, and conventional glucose monitoring tests. Historically, devices

Gail D. Baura

2006-01-01

209

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

210

Real-Time Fault Diagnostics  

Microsoft Academic Search

The intelligent process control system (IPCS), an integrated environment for developing complex process control and automation systems is discussed, focusing on its real-time fault diagnostics capability. IPCS has been used to build a supervisory monitoring and diagnostics system for a cogenerator plant. The requirements and problems specific to such systems are examined. The key concepts involved in fault modeling in

Samir Padalkar; Gabor Karsai; Csaba Biegl; Janos Sztipanovits; Koji Okuda; Nobuji Miyasaka

1991-01-01

211

Integrated mechanical diagnostic (IMD) health and usage monitoring system (hums); an open system implementation case study  

Microsoft Academic Search

The large number of flight critical and maintenance intensive dynamic components in a helicopter has led to the development of diagnostic systems to improve flight safety and reduce operations and support costs. These systems, commonly called health and usage monitoring systems (HUMS), have been used on large commercial helicopters and are now being developed for military helicopters. US Navy embarked

R. C. Muldoon; J. Gill; L. D. Brock

1999-01-01

212

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

213

MICE: The International Muon Ionization Cooling Experiment: Diagnostic Systems  

SciTech Connect

The Muon Ionization Cooling Experiment will make detailed measurements of muon ionization cooling using a new constructed low-energy muon beam at the Rutherford Appleton Laboratory (RAL). The experiment is a single-particle experiment and utilizes many detector techniques from high energy physics experiments. To characterize and monitor the muon beamline, newly developed scintillating fiber profile monitors and scintillator paddle rate monitors are employed. In order to monitor the purity of the beam and tag the arrival time of individual muons, a dual aerogel Cherenkov system is used, and a plastic scintillator time-of-flight system will be used. The phase-space vectors of the muons will be measured by two identical spectrometer systems (one before and one after the cooling apparatus) which employ a fiber tracker system, and electron and muon calorimeters are used to tag outgoing muons. We will discuss the design of the MICE diagnostic systems, the operation, and give the first results from beam measurements in the MICE experimental hall.

Bross, Alan D.; /Fermilab; Hart, Terrence Lee; /IIT, Chicago

2008-06-24

214

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

215

Spatial resolution test of a beam diagnostic system for DESIREE  

NASA Astrophysics Data System (ADS)

A diagnostic system based on the observation of low energy ( ˜ 10 eV) secondary electrons (SE) produced by a beam, striking a metallic foil has been built to monitor and to cover the wide range of beam intensities and energies for Double ElectroStatic Ion Ring ExpEriment [1,2].The system consists of a Faraday cup to measure the beam current, a collimator with circular apertures of different diameters to measure the spatial resolution of the system, a beam profile monitoring system (BPMS), and a control unit. The BPMS, in turn, consists of an aluminim (Al) foil, a grid placed in front of the Al foil to accelerate the SE, position sensitive MCP, fluorescent screen, and a CCD camera to capture the images. The collimator contains a set of circular holes of different diameters and separations (d) between them. The collimator cuts out from the beam areas equal to the holes with separation d mm between the beams centers and creates well separated (distinguishable) narrow beams of approximately same intensity close to each other. A 10 keV proton beam was used. The spatial resolution of the system was tested for different Al plate and MCP voltages and resolution of better than 2 mm was achieved. Ref.: 1. K. Kruglov {et al}., NIM A 441 (2000) 595; 701 (2002) 193c, 2. MSL and Atomic Physics, Stockholm Univ.(www.msl.se, http://www.atom.physto.se/Cederquist/desiree/web/hc.html).

Das, Susanta; Kallberg, A.

2010-11-01

216

Fast spatial-resolved beam diagnostics for material processing by industrial CO2 lasers  

NASA Astrophysics Data System (ADS)

Due to the increasing range of high-speed and high-accuracy applications in material processing, especially in laser beam welding and cutting, the temporal stability of the laser beam parameters becomes more and more important. In this paper a laser beam diagnostic device is presented, that allows the determination of the intensity-profiles of high- power CO2 lasers with high time-resolution. The detector of this device consists of two linear arrays of room- temperature HgCdTe-detectors, arranged perpendicularly to each other across the center of the beam. The data of the 70 detector elements is acquired simultaneously at rates up to 15 kS/sec for single shot events and several 100 kS/sec for repetitive laser pulses. Due to the use of a digital signal processor (DSP) and an especially adapted software, it is possible to analyze the fluctuations of the intensity distribution on-line. By help of a partially transmitting mirror in the beam delivery system, measurements can be performed during material processing. Therefore, the interaction of the laser beam source itself with the material processing due to beam reflection as well as influences of the industrial environment to the laser can be detected. The calculation of the local variance and mean values enables the dependence of the laser's short- and long-term stability to be investigated due to changes in the resonator alignment, the stability of the power supply, the gas composition etc., as well as to the influence of the processing. For the pulse-mode of a laser, its transient behavior like changes of the intensity distribution can be determined with high time-resolution. For the improvement of drilling processes, the calculation of further statistical functions by the DSP makes it possible to estimate the uniformity of the laser pulses on-line as well.

Martinen, Dirk; Decker, Ingo; Wohlfahrt, Helmut

1996-09-01

217

The SSCL process control system  

Microsoft Academic Search

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

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

1994-01-01

218

XPERT DESIGN AND DIAGNOSTICS' (XDD) IN-SITU CHEMICAL OXIDATION PROCESS USING POTASSIUM PERMANGANATE (KMNO4)  

EPA Science Inventory

Xpert Design and Diagnostic's (XDD)potassium permanganate in situ chemical oxidation (ISCO) process was evaluated under the EPA Superfund Innovative Technology Evaluation (SITE) Program at the former MEC Building site located in Hudson, New Hampshire. At this site, both soil and ...

219

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

220

Impact of the Diagnostic Process on Parents of Infants and Preschool Children. Final Report.  

ERIC Educational Resources Information Center

In an investigation of the impact of the psychological/educational diagnostic process on the parents of young children at risk for developmental delay, 18 families completed questionnaires and were interviewed concerning their child's evaluation. Transcribed interviews conducted 1-2 weeks after the evaluation and 4 months after the evaluations…

Tice, Terrence N.; Hanson, Janice L.

221

Unnatural base pair systems for sensing and diagnostic applications.  

PubMed

Expansion of the genetic alphabet by an unnatural base pair system provides a platform for the site-specific, enzymatic incorporation of extra, functional components into nucleic acids. Recently, several unnatural base pairs that exhibit high fidelity and efficiency in PCR have been developed. Functional groups of interest, such as fluorescent dyes, can be linked to the unnatural bases, and the modified base substrates are site-specifically incorporated into nucleic acids by polymerases. Furthermore, unique unnatural base pairs between fluorophore and quencher base analogs have been developed for imaging PCR amplification and as molecular beacons. Here, we describe the recent progress in the development of unnatural base pairs that function in PCR amplification and their applications as sensing and diagnostic tools. PMID:21463241

Kimoto, Michiko; Cox, Robert Sidney; Hirao, Ichiro

2011-04-01

222

Diagnostic and processing in SF6 RF remote plasma for silicon etching  

NASA Astrophysics Data System (ADS)

Plasma diagnostics and Si etching were carried out in 13.56 MHz SF6 remote plasma generated in a hollow cathode discharge system. The plasma diagnostics were performed in the remote zone at a constant pressure of 40 Pa, at a constant applied RF power of 300 W and as a function of the SF6 flow rate (40-2000 sccm), where absolute concentrations of fluorine atoms were measured using actinometry optical emission spectroscopy; electron density, electron temperature and plasma potential were determined using single Langmuir probe, positive ion flux and negative ion fraction were determined using an electrostatic planar probe. The silicon etching process was studied at two distant values of flow rate, 80 and 1800 sccm and for three conditions of the substrate holder, namely the substrate is grounded, the substrate is negatively biased and the substrate is positively biased. The etched silicon was characterized for etch rate, optical reflectance and photoluminescence properties. It was found that the etch rate is relatively high (about 15 mg cm-2 min-1) and it is controlled mainly by the ratio of the ion flux over the reactive atomic fluorine flux, the highest etch rate was obtained at the higher flow rate (1800 sccm) and for positively biased substrate. The reflectance of the silicon surface was significantly reduced after etching and a reflectance as low as 0.2% was measured. A visible photoluminescence from the etched surface was recorded; it is centred at about 600 nm, and its intensity is inversely proportional to the measured reflectance.

Saloum, S.; Akel, M.; Alkhaled, B.

2009-09-01

223

Application of a multidomain diagnostic expert system in a controlled ecological life support system  

NASA Astrophysics Data System (ADS)

A controlled ecological life support system (CELSS) is a critical technology for the Space Exploration Initiative. To reduce required manpower and increase CELSS reliability, an automated control system is being developed for CELSS. One part of the control system being investigated is the use of an expert system to troubleshoot mechanical failures in the biomass production chamber (BPC) within a CELSS at Kennedy Space Center, Florida. An expert system such as this would provide mission crew members with instructions and advice on how to minimize the impact of mechanical failures on the crop(s) being raised in the BPC. The nutrient delivery system (NDS) is one of the most critical subsystems of the BPC and is representative of the other BPC subsystems. The NDS is the primary focus of the expert system that was developed. The biomass production chamber operations assistant fact base was developed using several experts from the fields of mechanical engineering and biology. This combination of expertise provides the BPC Operations Assistant with a knowledge base that can assess the criticality of a mechanical failure, identify the short and long term effects on the resident crop(s), and provide instructions for bringing failed mechanical sub-systems back on-line. The BPC Operations Assistant can also help in the decision process of a failure scenario as to when it might be more cost effective to replant a crop versus continuing growing, or immediate harvesting of the crop(s). The experience gained from the research and development of the BPC Operations Assistant provides key insights into knowledge-based monitoring and diagnostic systems that will be required for the manned exploration of space in the future.

Clinger, Barry R.; Damiano, Alfred L.

1994-03-01

224

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).

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

2011-01-01

225

Mission Evaluation Room Intelligent Diagnostic and Analysis System (MIDAS)  

NASA Technical Reports Server (NTRS)

The role of Mission Evaluation Room (MER) engineers is to provide engineering support during Space Shuttle missions, for Space Shuttle systems. These engineers are concerned with ensuring that the systems for which they are responsible function reliably, and as intended. The MER is a central facility from which engineers may work, in fulfilling this obligation. Engineers participate in real-time monitoring of shuttle telemetry data and provide a variety of analyses associated with the operation of the shuttle. The Johnson Space Center's Automation and Robotics Division is working to transfer advances in intelligent systems technology to NASA's operational environment. Specifically, the MER Intelligent Diagnostic and Analysis System (MIDAS) project provides MER engineers with software to assist them with monitoring, filtering and analyzing Shuttle telemetry data, during and after Shuttle missions. MIDAS off-loads to computers and software, the tasks of data gathering, filtering, and analysis, and provides the engineers with information which is in a more concise and usable form needed to support decision making and engineering evaluation. Engineers are then able to concentrate on more difficult problems as they arise. This paper describes some, but not all of the applications that have been developed for MER engineers, under the MIDAS Project. The sampling described herewith was selected to show the range of tasks that engineers must perform for mission support, and to show the various levels of automation that have been applied to assist their efforts.

Pack, Ginger L.; Falgout, Jane; Barcio, Joseph; Shnurer, Steve; Wadsworth, David; Flores, Louis

1994-01-01

226

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

227

Economic comparison of diagnostic antibody production in perfusion stirred tank and in hollow fiber bioreactor processes.  

PubMed

The total operating costs of small-scale monoclonal antibody production were calculated for two different upstream options and general downstream procedure based on protein A chromatography. The upstream options were a spin-filter equipped stirred-tank bioreactor (STR) and a hollow fiber bioreactor (HFB). Both the bioreactors were operated in perfusion mode. The total operating costs of the processes were 6,900 €/g for STR option and 6,400 €/g for the HFB option. In the both systems, the costs were dominated by expenses derived from the downstream section (almost 80%) that was almost identical in the both systems. In the upstream section, the investment depreciation was the largest cost item. The lower total costs of the HFB option were a result of lower investment costs and more concentrated product that led into savings also in downstream section. This study brings out the HFB as on viable alternative for stirred-tank bioreactor, especially in small-scale diagnostic monoclonal antibody production. PMID:21954092

Vermasvuori, Raisa; Hurme, Markku

2011-01-01

228

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

229

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

230

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

231

Feedback control and beam diagnostic algorithms for a multiprocessor DSP system  

SciTech Connect

The multibunch longitudinal feedback system developed for use by PEP-II, ALS and DA{Phi}NE uses a parallel array of digital signal processors to calculate the feedback signals from measurements of beam motion. The system is designed with general-purpose programmable elements which allow many feedback operating modes as well as system diagnostics, calibrations and accelerator measurements. The overall signal processing architecture of the system is illustrated. The real-time DSP algorithms and off-line postprocessing tools are presented. The problems in managing 320 K samples of data collected in one beam transient measurement are discussed and the solutions are presented. Example software structures are presented showing the beam feedback process, techniques for modal analysis of beam motion(used to quantify growth and damping rates of instabilities) and diagnostic functions (such as timing adjustment of beam pick-up and kicker components). These operating techniques are illustrated with example results obtained from the system installed at the Advanced Light Source at LBL.

Teytelman, D.; Claus, R.; Fox, J.; Hindi, H.; Linscott, I.; Prabhakar, S. [Stanford Univ., CA (United States). Stanford Linear Accelerator Center; Drago, A. [INFN, Roma (Italy). Lab. Nazionali di Frascati; Stover, G. [Lawrence Berkeley Lab., CA (United States)

1996-09-01

232

Feedback control and beam diagnostic algorithms for a multiprocessor DSP system  

SciTech Connect

The multibunch longitudinal feedback system developed for use by PEP-II, ALS, and DA{Phi}NE uses a parallel array of digital signal processors (DSPs) to calculate the feedback signals from measurements of beam motion. The system is designed with general-purpose programmable elements which allow many feedback operating modes as well as system diagnostics, calibrations, and accelerator measurements. The overall signal processing architecture of the system is illustrated. The real-time DSP algorithms and off-line postprocessing tools are presented. The problems in managing 320k samples of data collected in one beam transient measurement are discussed and our solutions are presented. Example software structures are presented showing the beam feedback process, techniques for modal analysis of beam motion (used to quantify growth and damping rates of instabilities), and diagnostic functions (such as timing adjustment of beam pick-up and kicker components). These operating techniques are illustrated with example results obtained from the system installed at the Advanced Light Source at LBL. {copyright} {ital 1997 American Institute of Physics.}

Teytelman, D.; Claus, R.; Fox, J.; Hindi, H.; Linscott, I.; Prabhakar, S. [Stanford Linear Accelerator Center, P.O. Box 4349, Stanford, California 94309 (United States); Drago, A. [INFN---Laboratori Nazionali di Frascati, P.O. Box 13, I-00044 Frascati (Roma) (Italy); Stover, G. [Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94563 (United States)

1997-01-01

233

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

234

Improvements to a high-frequency fiber-optic system for plasma diagnostics  

SciTech Connect

A system for high-frequency recording of plasma diagnostics has previously been reported. Substantial improvements have been made in the system response, dynamic range, and calibration of the system. Plastic-clad silica fiber is used as a radiation-to-light converter using the Cerenkov process. A spectral equalizer device is used to compensate for the material dispersion in the fiber, increasing the frequency response (approx. = 1 GHz-km) and the dynamic range (a factor of > 20 over a FWHM 1 nm, 50% transmitting interference filter). The calibration system uses a pulsed injection laser diode (< 100 ps FWHM) injected into the fiber at the radiation end of the fiber and detected by a microchannel plate photomultiplier tube on the recording end. The injection laser diode is triggered by a synchronous trigger delay unit, which also triggers a sampling or real time scope after as much as 10 ..mu..s delay with < 50 ps jitter. The system improvements are described in detail and the utility of these components in other plasma diagnostic systems is discussed.

Ogle, J.W.; Lyons, P.B.; Looney, L.; Hocker, L.; Nelson, M.A.; Zagarino, P.A.; Davies, T.J.; Simmons, R.D.; Selk, R.; Hopkins, B.

1981-01-01

235

An integrated fuzzy inference based monitoring, diagnostic, and prognostic system  

NASA Astrophysics Data System (ADS)

To date the majority of the research related to the development and application of monitoring, diagnostic, and prognostic systems has been exclusive in the sense that only one of the three areas is the focus of the work. While previous research progresses each of the respective fields, the end result is a variable "grab bag" of techniques that address each problem independently. Also, the new field of prognostics is lacking in the sense that few methods have been proposed that produce estimates of the remaining useful life (RUL) of a device or can be realistically applied to real-world systems. This work addresses both problems by developing the nonparametric fuzzy inference system (NFIS) which is adapted for monitoring, diagnosis, and prognosis and then proposing the path classification and estimation (PACE) model that can be used to predict the RUL of a device that does or does not have a well defined failure threshold. To test and evaluate the proposed methods, they were applied to detect, diagnose, and prognose faults and failures in the hydraulic steering system of a deep oil exploration drill. The monitoring system implementing an NFIS predictor and sequential probability ratio test (SPRT) detector produced comparable detection rates to a monitoring system implementing an autoassociative kernel regression (AAKR) predictor and SPRT detector, specifically 80% vs. 85% for the NFIS and AAKR monitor respectively. It was also found that the NFIS monitor produced fewer false alarms. Next, the monitoring system outputs were used to generate symptom patterns for k-nearest neighbor (kNN) and NFIS classifiers that were trained to diagnose different fault classes. The NFIS diagnoser was shown to significantly outperform the kNN diagnoser, with overall accuracies of 96% vs. 89% respectively. Finally, the PACE implementing the NFIS was used to predict the RUL for different failure modes. The errors of the RUL estimates produced by the PACE-NFIS prognosers ranged from 1.2-11.4 hours with 95% confidence intervals (CI) from 0.67-32.02 hours, which are significantly better than the population based prognoser estimates with errors of ˜45 hours and 95% CIs of ˜162 hours.

Garvey, Dustin

236

Development of life prediction capabilities for liquid propellant rocket engines. Post-fire diagnostic system for the SSME system architecture study  

NASA Technical Reports Server (NTRS)

This system architecture task (1) analyzed the current process used to make an assessment of engine and component health after each test or flight firing of an SSME, (2) developed an approach and a specific set of objectives and requirements for automated diagnostics during post fire health assessment, and (3) listed and described the software applications required to implement this system. The diagnostic system described is a distributed system with a database management system to store diagnostic information and test data, a CAE package for visual data analysis and preparation of plots of hot-fire data, a set of procedural applications for routine anomaly detection, and an expert system for the advanced anomaly detection and evaluation.

Gage, Mark; Dehoff, Ronald

1991-01-01

237

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

238

Artificial neural network based fault diagnostic system for electric power distribution feeders  

Microsoft Academic Search

This paper describes the development of a fast, efficient, artificial neural network (ANN) based fault diagnostic system (FDS) for distribution feeders. The principal functions of this diagnostic system are: (i) detection of fault occurrence, (ii) identification of faulted sections, and (iii) classification of faults into types, e.g. HIFs (high impedance faults) or LIFs (low impedance faults). This has been achieved

E. A. Mohamed; N. D. Rao

1995-01-01

239

Coded excitation for diagnostic ultrasound: a system developer's perspective.  

PubMed

Resolution and penetration are primary criteria for clinical image quality. Conventionally, high bandwidth for resolution was achieved with a short pulse, which results in a tradeoff between resolution and penetration. Coded excitation extends the bounds of this tradeoff by increasing signal-to-noise ratio (SNR) through appropriate coding on transmit and decoding on receive. Although used for about 50 years in radar, coded excitation was successfully introduced into commercial ultrasound scanners only within the last 5 years. This delay is at least partly due to practical implementation issues particular to diagnostic ultrasound, which are the focus of this paper. After reviewing the basics of biphase and chirp coding, we present simulation results to quantify tradeoffs between penetration and resolution under frequency-dependent attenuation, dynamic focusing, and nonlinear propagation. Next we compare chirp and Golay code performance with respect to image quality and system requirements, then we show clinical images that illustrate the current applications of coded excitation in B-mode, harmonic, and flow imaging. PMID:15801305

Chiao, Richard Y; Hao, Xiaohui

2005-02-01

240

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

241

Real-time optical diagnostics for the basic oxygen steelmaking process  

Microsoft Academic Search

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.

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

1993-01-01

242

Real-time optical diagnostics for the basic oxygen steelmaking process  

Microsoft Academic Search

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.

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

1993-01-01

243

Pulsed UV laser-surface interaction and application of pulsed lasers in process diagnostics  

Microsoft Academic Search

This dissertation describes studies on the interaction of 193 nm laser pulses with various materials. These pulses are used to ablate photo-resists, high T$\\\\sb{\\\\rm c}$ superconductors, graphite, and several films of inorganic metal oxides that have been used to make superconducting materials. Also described are several applications of pulsed UV lasers in chemical process diagnostics.^ In the case of polymer

Subhash Madhukar Deshmukh

1989-01-01

244

Improving Antarctic Total Ozone Projections by a Process-Oriented Multiple Diagnostic Ensemble Regression  

NASA Astrophysics Data System (ADS)

Accurate projections of stratospheric ozone are required, because ozone changes impact onexposures to ultraviolet radiation and on tropospheric climate. Unweighted multi-model ensemble mean (uMMM) projections from chemistry-climate models (CCMs) are commonly used to project ozone in the 21 th century, when ozone-depleting substances are expected to decline and greenhouse gases expected to rise. Here, we address the question whether Antarctic total column ozone projections in October given by the uMMM of CCM simulations can be improved by using a process-oriented multiple diagnostic ensemble regression (MDER) method. This method is based on the correlation between simulated future ozone and selected key processes relevant for stratospheric ozone under present-day conditions. The regression model is built using an algorithm that selects those process-oriented diagnostics which explain a significant fraction of the spread in the projected ozone among the CCMs. The regression model with observed diagnostics is then used to predict future ozone and associated uncertainty. The precision of our method is tested in a pseudo-reality, i.e. the prediction is validated against an independent CCM projection used to replace unavailable future observations. The test shows that MDER has a higher precision than uMMM, suggesting an improvement in the estimate of future Antarctic ozone. Our method projects that Antarctic total ozone will return to 1980 values around 2060 with the 95% confidence interval ranging from 2040 to 2080. This reduces the range of return dates across the ensemble of CCMs by more than a decade and suggests that the earliest simulated return dates are unlikely. Karpechko, Maraun and Eyring (2013) Improving Antarctic Total Ozone Projections by a Process-Oriented Multiple Diagnostic Ensemble Regression, J. Atmos. Sci. 70: 3959-3976

Karpechko, Aleyey; Maraun, Douglas; Eyring, Veronika

2014-05-01

245

Development of a Fluorescent Caries-Disclosing Diagnostic System.  

National Technical Information Service (NTIS)

A method for early diagnosis of incipient dental caries based on the permeation of lesions with fluorescent indicators was developed and tested. Three fluorescent caries-diagnostic formulations (CDF'S) were developed and tested. Artificial lesions were ex...

H. R. Rawls, K. Q. Robert, J. C. LeDoux, E. E. Green, E. L. Zimmerman

1978-01-01

246

Nonconservative Probabilistic Information Processing Systems.  

National Technical Information Service (NTIS)

The report is concerned with two large-scale simulation experiments on probabilistic information processing (PIP) systems. One, a very large and prolonged study of four systems, yielded the conclusion that PIP is indeed an efficient philosophy for informa...

W. Edwards

1966-01-01

247

Digital TV processing system  

NASA Technical Reports Server (NTRS)

Two digital video data compression systems directly applicable to the Space Shuttle TV Communication System were described: (1) For the uplink, a low rate monochrome data compressor is used. The compression is achieved by using a motion detection technique in the Hadamard domain. To transform the variable source rate into a fixed rate, an adaptive rate buffer is provided. (2) For the downlink, a color data compressor is considered. The compression is achieved first by intra-color transformation of the original signal vector, into a vector which has lower information entropy. Then two-dimensional data compression techniques are applied to the Hadamard transformed components of this last vector. Mathematical models and data reliability analyses were also provided for the above video data compression techniques transmitted over a channel encoded Gaussian channel. It was shown that substantial gains can be achieved by the combination of video source and channel coding.

1975-01-01

248

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

249

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

250

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

251

Integrated optical system for investigation and diagnostics of abnormal combustion in an automotive engine  

NASA Astrophysics Data System (ADS)

The paper presents a research project oriented towards development of existing measurement methods which use optical sensors for the research and diagnostics of the combustion process in the internal-combustion automotive enigne. Experiments assume usage of photometric techniques and in particular spectrophotometry of the flames existing in the combustion chamber. Gathered results will enable expanding knowledge about processes taking place during combustion of air-fuel mixture and accompanying phenomena (i.e. knock, misfires). The work is also aimed at designing a diagnostic system which will enable an on-line identification of unfavorable phenomena like knocking combustion or misfires (lack of combustion). Extracted synthetic quality indexes will be used in the improvement of combustion process and as a feedback signals in the engine control algorithms. Research is made on the typical automotive engine equipped with an optical sensor located in the engine head and having direct access into the combustion chamber. The sensor enables on-line transmission of the optical signal during the combustion through the bundle of optical waveguides and two parallel filtering paths. Then optical signal was filtered with set of interference filters. The paper is illustrated with some results obtained during preliminary experiments.

Piernikarski, Dariusz

2004-09-01

252

The process safety impact of distributed control systems  

SciTech Connect

Experience has shown that a Distributed Control System (DCS) can provide enhanced process monitoring and control capabilities, as well as system self-diagnostics, that permit increased safety of process operations. However, this enhanced safety does not come about automatically with the installation of a DCS. The complexity and versatility of the DCS can introduce new failure scenarios leading to process upset and potential realization of process hazards. This paper review some novel considerations that should be taken into account when conducting process hazards reviews on facilities controlled by a DCS.

Franke, W.L.; Zodeh, O.M. (E.I. Du Pont de Nemours and Co. Inc., Newark, DE (USA))

1991-04-01

253

ASIC design of a digital fuzzy system on chip for medical diagnostic applications.  

PubMed

The paper presents the ASIC design of a digital fuzzy logic circuit for medical diagnostic applications. The system on chip under consideration uses fuzzifier, memory and defuzzifier for fuzzifying the patient data, storing the membership function values and defuzzifying the membership function values to get the output decision. The proposed circuit uses triangular trapezoidal membership functions for fuzzification patients' data. For minimizing the transistor count, the proposed circuit uses 3T XOR gates and 8T adders for its design. The entire work has been carried out using TSMC 0.35 µm CMOS process. Post layout TSPICE simulation of the whole circuit indicates a delay of 31.27 ns and the average power dissipation of the system on chip is 123.49 mW which indicates a less delay and less power dissipation than the comparable embedded systems reported earlier. PMID:20703567

Roy Chowdhury, Shubhajit; Roy, Aniruddha; Saha, Hiranmay

2011-04-01

254

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

255

Developing a genomic-based point-of-care diagnostic system for rheumatoid arthritis and multiple sclerosis  

Microsoft Academic Search

In this paper the methodology of designing a genomic-based point-of-care diagnostic system composed of a microfluidic Lab-On-Chip, algorithms for microarray image information extraction and knowledge modeling of clinico-genomic patient data is presented. The data are processed by genome wide association studies for two complex diseases: rheumatoid arthritis and multiple sclerosis. Respecting current technological limitations of autonomous molecular-based lab-on-chip systems the

Fanis G. Kalatzis; Nikolaos Giannakeas; Themis P. Exarchos; Leandro Lorenzelli; Andrea Adami; Massimiliano Decarli; Sara Lupoli; Fabio Macciardi; Sofia Markoula; Ioannis Georgiou; Dimitrios I. Fotiadis

2009-01-01

256

Diagnoses and Presenting Symptoms in an Infant Psychiatry Clinic: Comparison of Two Diagnostic Systems.  

ERIC Educational Resources Information Center

Objective: To present data from a general infant psychiatry clinic, including range and frequency of presenting symptoms, relationship between symptoms and diagnoses, and comparison of two diagnostic systems, DSM-IV and Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood (DC: 0-3). Method: A…

Frankel, Karen A.; Boyum, Lisa A.; Harmon, Robert J.

2004-01-01

257

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...

258

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

259

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

260

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

261

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.

Miller, R A

1994-01-01

262

Conversion-Integration of MSFC Nonlinear Signal Diagnostic Analysis Algorithms for Realtime Execution of MSFC's MPP Prototype System  

NASA Technical Reports Server (NTRS)

NASA's advanced propulsion system Small Scale Magnetic Disturbances/Advanced Technology Development (SSME/ATD) has been undergoing extensive flight certification and developmental testing, which involves large numbers of health monitoring measurements. To enhance engine safety and reliability, detailed analysis and evaluation of the measurement signals are mandatory to assess its dynamic characteristics and operational condition. Efficient and reliable signal detection techniques will reduce the risk of catastrophic system failures and expedite the evaluation of both flight and ground test data, and thereby reduce launch turn-around time. During the development of SSME, ASRI participated in the research and development of several advanced non- linear signal diagnostic methods for health monitoring and failure prediction in turbomachinery components. However, due to the intensive computational requirement associated with such advanced analysis tasks, current SSME dynamic data analysis and diagnostic evaluation is performed off-line following flight or ground test with a typical diagnostic turnaround time of one to two days. The objective of MSFC's MPP Prototype System is to eliminate such 'diagnostic lag time' by achieving signal processing and analysis in real-time. Such an on-line diagnostic system can provide sufficient lead time to initiate corrective action and also to enable efficient scheduling of inspection, maintenance and repair activities. The major objective of this project was to convert and implement a number of advanced nonlinear diagnostic DSP algorithms in a format consistent with that required for integration into the Vanderbilt Multigraph Architecture (MGA) Model Based Programming environment. This effort will allow the real-time execution of these algorithms using the MSFC MPP Prototype System. ASRI has completed the software conversion and integration of a sequence of nonlinear signal analysis techniques specified in the SOW for real-time execution on MSFC's MPP Prototype. This report documents and summarizes the results of the contract tasks; provides the complete computer source code; including all FORTRAN/C Utilities; and all other utilities/supporting software libraries that are required for operation.

Jong, Jen-Yi

1996-01-01

263

Intelligent Work Process Engineering System  

NASA Technical Reports Server (NTRS)

Optimizing performance on work activities and processes requires metrics of performance for management to monitor and analyze in order to support further improvements in efficiency, effectiveness, safety, reliability and cost. Information systems are therefore required to assist management in making timely, informed decisions regarding these work processes and activities. Currently information systems regarding Space Shuttle maintenance and servicing do not exist to make such timely decisions. The work to be presented details a system which incorporates various automated and intelligent processes and analysis tools to capture organize and analyze work process related data, to make the necessary decisions to meet KSC organizational goals. The advantages and disadvantages of design alternatives to the development of such a system will be discussed including technologies, which would need to bedesigned, prototyped and evaluated.

Williams, Kent E.

2003-01-01

264

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.

Masood, Ammara; Al-Jumaily, Adel Ali

2013-01-01

265

A fully automated in vitro diagnostic system based on magnetic tunnel junction arrays and superparamagnetic particles  

NASA Astrophysics Data System (ADS)

A fully automated in vitro diagnostic (IVD) system for diagnosing acute myocardial infarction was developed using high sensitivity MTJ array as sensors and nano-magnetic particles as tags. On the chip is an array of 12 × 106 MTJ devices integrated onto a 3 metal layer CMOS circuit. The array is divided into 48 detection areas, therefore 48 different types of bio targets can be analyzed simultaneously if needed. The chip is assembled with a micro-fluidic cartridge which contains all the reagents necessary for completing the assaying process. Integrated with electrical, mechanical and micro-fluidic pumping devices and with the reaction protocol programed in a microprocessor, the system only requires a simple one-step analyte application procedure to operate and yields results of the three major AMI bio-markers (cTnI, MYO, CK-MB) in 15 mins.

Lian, Jie; Chen, Si; Qiu, Yuqin; Zhang, Suohui; Shi, Stone; Gao, Yunhua

2012-04-01

266

Seminal plasma as a diagnostic fluid for male reproductive system disorders.  

PubMed

Molecular biomarkers hold promise to advance the noninvasive diagnosis of male reproductive system disorders and facilitate the identification and management of these conditions through screening, early diagnosis and more accurate prognosis. Seminal plasma has great potential as a proximal fluid for protein biomarker discovery and as a clinical sample for noninvasive diagnostics. The seminal plasma proteome contains thousands of proteins and includes a large number of tissue-specific proteins that might accurately indicate a pathological process in the tissue of origin. Potential protein biomarkers for male reproductive system disorders are more abundant in seminal plasma than in blood serum or urine, and, therefore, are more easily identified and quantified in semen by mass spectrometry and other techniques. These methods have enabled elaboration of the composition of the seminal plasma proteome and the tissue specificity of seminal plasma proteins. Strategies have been developed to discover protein biomarkers in seminal plasma through integrated 'omics' approaches. Biomarkers of male infertility and prostate cancer are now emerging, and it is evident that seminal plasma has the potential to complement other diagnostic tools available in urology clinics. PMID:24709963

Drabovich, Andrei P; Saraon, Punit; Jarvi, Keith; Diamandis, Eleftherios P

2014-05-01

267

Use of the target diagnostic control system in 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 including optical backscatter, time-integrated, time resolved and gated X-ray sensors, laser velocity interferometry, and neutron time of flight. Diagnostics to diagnose fusion ignition implosion and neutron emissions have been developed. A Diagnostic Control System (DCS) 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 Window XP processor and Java application. Instruments are aggregated as needed in the supervisory system to form an integrated diagnostic. The Java framework provides data management, control services and operator GUI generation. During the past several years, over thirty-six diagnostics have been deployed using this architecture in support of the National Ignition Campaign (NIC). The DCS architecture facilitates the expected additions and upgrades to diagnostics as more experiments are performed. This paper presents the DCS architecture, framework and our experiences in using it during the NIC to operate, upgrade and maintain a large set of diagnostic instruments.

Shelton, R; Lagin, L; Nelson, J

2011-07-25

268

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

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

269

Local area network for the plasma diagnostics system of MFTF-B  

SciTech Connect

The MFTF-B Plasma Diagnostics System will be implemented in stages, beginning with a start-up set of diagnostics and evolving toward a basic set. The start-up set contains 12 diagnostics which will acquire a total of about 800 Kbytes of data per machine pulse; the basic set contains 23 diagnostics which will acquire a total of about 8 Mbytes of data per pulse. Each diagnostic is controlled by a Foundation System consisting of a DEC LSI-11/23 microcomputer connected to CAMAC via a 5 Mbits/second serial fiber-optic link and connected to a supervisory computer (Perkin-Elmer 3250) via a 9600 baud RS232 link. The Foundation System is a building block used throughout MFTF-B for control and status monitoring. However, its 9600 baud link to the supervisor presents a bottleneck for the large data transfers required by diagnostics. To overcome this bottleneck the diagnostics Foundation Systems will be connected together with an additional LSI-11/23 called the master to form a Local Area Network (LAN) for data acquisition.

Lau, N.H.; Minor, E.G.

1983-01-01

270

Charge exchange recombination diagnostic system on the DIII-D tokamak.  

National Technical Information Service (NTIS)

The charge exchange recombination (CER) diagnostic system on the DIII-D tokamak is used to make spatially and temporally resolved measurements of the ion temperature and toroidal and poloidal rotation velocities. This is performed through visible spectros...

P. Gohil K. H. Burrell R. J. Groebner J. Kim W. C. Martin

1991-01-01

271

Arousal systems and attentional processes  

Microsoft Academic Search

Unitary concepts of arousal have outlived their usefulness and their psychological fractionation corresponds to a similar chemical differentiation of the reticular formation of the brain. Neurobiological characteristics of the monoaminergic and cholinergic systems can be described in terms of their anatomical, electrophysiological and neurochemical properties. Functional studies suggest that the coeruleo-cortical noradrenergic system, under certain circumstances, is implicated in processes

Trevor W. Robbins

1997-01-01

272

Diagnostic utility of anti-Ro52 detection in systemic autoimmunity  

Microsoft Academic Search

ObjectivesTo determine the prevalence and diagnostic utility of monospecific anti-Ro52 (defined as an immune response against Ro-52 antigen in the absence of reactivity to Ro-60 antigen) reactivity in selected autoimmune diseases.Study designStored diagnostic non-consecutive serum samples obtained from patients with systemic lupus erythematosus (SLE), primary Sjögren's syndrome (pSS), systemic sclerosis, idiopathic inflammatory myopathies (IIM), rheumatoid arthritis, primary biliary cirrhosis and

Manish Dugar; Sally Cox; Vidya Limaye; Tom Paul Gordon; Peter John Roberts-Thomson

2010-01-01

273

[Real time diagnostics of instantaneous temperature of combustion and explosion process by modern spectroscopy].  

PubMed

The combustion temperature is one of the important parameters to express flame combustion and explosion characteristics. It will effectively guide the design and manufacture of new model explosives, industrial explosive materials, and weapons. The recent developments and applications of real time diagnostics of instantaneous temperature of combustion and explosion processes by modern spectroscopic methods, such as atomic absorption-emission method, atomic emission two-line spectroscopy, atomic emission multiline spectroscopy, molecular rotation-vibration spectroscopy, coherent anti-stokes Raman scattering (CARS) and plane laser-induced fluorescence (PLIF), were reviewed in this paper. The maximum time resolution of atomic absorption-emission method is 25 microseconds. The time resolution of atomic emission two-line spectroscopy can reach 0.1 microsecond. These two methods can completely suit the need of real time and instantaneous temperature diagnostics of violent explosion and flame combustion. Other methods will also provide new effective research methods for the processes and characteristics of combustion, flame and explosion. PMID:12961909

Zhou, Xue-tie; Wang, Jun-de; Li, Yan; Liu, Da-bing

2003-04-01

274

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

275

Plasma–surface interactions at nanoscales: a combinatorial theoretical, process diagnostics and surface microanalysis approach  

NASA Astrophysics Data System (ADS)

This paper introduces an integral approach to the study of plasma–surface interactions during the catalytic growth of selected nanostructures (NSs). This approach involves basic understanding of the plasma-specific effects in NS nucleation and growth, theoretical modelling, numerical simulations, plasma diagnostics, and surface microanalysis. Using an example of plasma-assisted growth of surface-supported single-walled carbon nanotubes, we discuss how the combination of these techniques may help improve the outcomes of the growth process. A specific focus here is on the effects of nanoscale plasma–surface interactions on the NS growth and how the available techniques may be used, both in situ and ex situ to optimize the growth process and structural parameters of NSs.

(Ken Ostrikov, Kostya

2014-06-01

276

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

Microsoft Academic Search

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.

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

1990-01-01

277

[Digestive system lesions in relation to AIDS. Diagnostic value].  

PubMed

The histopathological study of the digestive mucosae has a great diagnostic value. It appreciates lymphoid tissue; it may suggest AIDS when it discloses rare inflammatory or tumoral lesions; it may disclose an infectious and/or Kaposi sarcoma lesion which may be the first manifestation of AIDS in a seropositive LAV patient or may be an additional lesion in a patient known to have AIDS. The autopsies have shown the spread of the extension and the evolution of these lesions. The discussion of the histopathological lesions must always include the extra-digestive localisations as well as the "non opportunistic" associated infections. PMID:3814267

Marche, C; Zoubi, D; René, E; Girard, P M

1986-01-01

278

Fiber optical delivery systems for surgery, diagnostics, and phototherapy  

NASA Astrophysics Data System (ADS)

New promising medical applications of IR lasers can be much wider with flexible cables and catheters for laser power delivery. Special super-dry silica fiber allow catheters to be designed for promising Ho and Tm lasers at wavelengths about 2 micrometers . But for longer wavelengths of Er:, CO- and CO2-lasers, other fibers should be used--polycrystalline silver halide fibers, singlecrystalline sapphire fibers, and hollow metal waveguides. Optical parameters of such fibers are under discussion alongside a design of special optical connectors, efficient coupling units, and optics at distal end. Applications of cables and catheters for laser therapy and medical diagnostics are analyzed.

Artioushenko, Vjacheslav G.

1992-03-01

279

Advanced Information Processing System (AIPS)  

NASA Technical Reports Server (NTRS)

Advanced Information Processing System (AIPS) is a computer systems philosophy, a set of validated hardware building blocks, and a set of validated services as embodied in system software. The goal of AIPS is to provide the knowledgebase which will allow achievement of validated fault-tolerant distributed computer system architectures, suitable for a broad range of applications, having failure probability requirements of 10E-9 at 10 hours. A background and description is given followed by program accomplishments, the current focus, applications, technology transfer, FY92 accomplishments, and funding.

Pitts, Felix L.

1993-01-01

280

A vibroacoustic diagnostic system as an element improving road transport safety.  

PubMed

Mechanical defects of a vehicle driving system can be dangerous on the road. Diagnostic systems, which monitor operations of electric and electronic elements and devices of vehicles, are continuously developed and improved, while defects of mechanical systems are still not managed properly. This article proposes supplementing existing on-board diagnostics with a system of diagnosing selected defects to minimize their impact. It presents a method of diagnosing mechanical defects of the engine, gearbox and other elements of the driving system on the basis of a model of the vibration signal obtained adaptively. This method is suitable for engine valves, engine head gasket, main gearbox, joints, etc. PMID:24034880

Komorska, Iwona

2013-01-01

281

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

282

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

283

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

284

A Diagnostic System for Studying Energy Partitioning and Assessing the Response of the Ionosphere during HAARP Modification Experiments  

NASA Technical Reports Server (NTRS)

This research program focused on the construction of several key radio wave diagnostics in support of the HF Active Auroral Ionospheric Research Program (HAARP). Project activities led to the design, development, and fabrication of a variety of hardware units and to the development of several menu-driven software packages for data acquisition and analysis. The principal instrumentation includes an HF (28 MHz) radar system, a VHF (50 MHz) radar system, and a high-speed radar processor consisting of three separable processing units. The processor system supports the HF and VHF radars and is capable of acquiring very detailed data with large incoherent scatter radars. In addition, a tunable HF receiver system having high dynamic range was developed primarily for measurements of stimulated electromagnetic emissions (SEE). A separate processor unit was constructed for the SEE receiver. Finally, a large amount of support instrumentation was developed to accommodate complex field experiments. Overall, the HAARP diagnostics are powerful tools for studying diverse ionospheric modification phenomena. They are also flexible enough to support a host of other missions beyond the scope of HAARP. Many new research programs have been initiated by applying the HAARP diagnostics to studies of natural atmospheric processes.

Djuth, Frank T.; Elder, John H.; Williams, Kenneth L.

1996-01-01

285

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

286

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

287

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.

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

2013-01-01

288

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 1990s cannot enjoy an increased level of autonomy without the efficient implementation of expert systems. Merely increasing the computational speed of uniprocessors may not be able to guarantee that real-time demands are met for larger systems. Speedup via parallel processing must be pursued alongside the optimization of sequential implementations. Prototypes of parallel expert systems have been built at universities and industrial laboratories in the U.S. and Japan. The state-of-the-art research in progress related to parallel execution of expert systems is surveyed. The survey discusses multiprocessors for expert systems, parallel languages for symbolic computations, and mapping expert systems to multiprocessors. Results to date indicate that the parallelism achieved for these systems is small. The main reasons are (1) the body of knowledge applicable in any given situation and the amount of computation executed by each rule firing are small, (2) dividing the problem solving process into relatively independent partitions is difficult, and (3) implementation decisions that enable expert systems to be incrementally refined hamper compile-time optimization. In order to obtain greater speedups, data parallelism and application parallelism must be exploited.

Lau, Sonie; Yan, Jerry C.

1991-01-01

289

Integrated optical system for investigation and diagnostics of abnormal combustion in an automotive engine  

Microsoft Academic Search

The paper presents a research project oriented towards development of existing measurement methods which use optical sensors for the research and diagnostics of the combustion process in the internal-combustion automotive enigne. Experiments assume usage of photometric techniques and in particular spectrophotometry of the flames existing in the combustion chamber. Gathered results will enable expanding knowledge about processes taking place during

Dariusz Piernikarski

2004-01-01

290

Comprehensive analysis and differentiated assessment of food safety control systems: a diagnostic instrument  

Microsoft Academic Search

In this article, an instrument is presented to diagnose microbial safety control activities in a food safety management system. The need of such a tool is derived from the importance of microbial safety control and the need for improvement of existing control systems. Careful diagnosis of these systems provides the basis for their improvement. The diagnostic instrument provides a comprehensive

P. A. Luning; L. Bango; J. Kussaga; J. Rovira; W. J. Marcelis

2008-01-01

291

The Diagnostic Challenge Competition: Probabilistic Techniques for Fault Diagnosis in Electrical Power Systems  

Microsoft Academic Search

Reliable systems health management is an important research area of NASA. A health management system that can accurately and quickly diagnose faults in various on-board systems of a vehicle will play a key role in the success of current and future NASA missions. We introduce in this paper the ProDiagnose algorithm, a diagnostic algorithm that uses a probabilistic approach, accomplished

Brian W. Ricks; Ole J. Mengshoel

292

Modeling and optimization of systems for integrated diagnostics and repair of complex photonic units  

Microsoft Academic Search

The problem under examination is the modeling and optimization f systems for integrated diagnostics and repair of complex photonic units. There were considered the structure and principles of organization of such systems, model of formation of their material and information streams. Basic conditions of stable systems' operation are drawn. The question of choosing of adequate modeling and optimization mathematical means

S. N. Nikiforov

1999-01-01

293

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

294

Operations manual for the Electrical Circuit Characterization and Diagnostic (ECCAD) system  

Microsoft Academic Search

This report describes the operational aspects of the Electrical Circuit Characterization And Diagnostic (ECCAD) system including both Data Acquisition and the ACE Data Analysis package. The purpose is to describe for the user of the ECCAD system the installation, operation, and maintenance of the equipment. The ECCAD system was initially developed and operated by EG and G Idaho, Inc. for

J. L. Edson; M. R. Dinsel; M. C. Lebo

1987-01-01

295

Contributions of Psychology to the Design of Diagnostic Decision Support Systems  

Microsoft Academic Search

\\u000a This paper describes how psychological research can contribute to the requirements engineering, the design and usefulness\\u000a of a Diagnostic Decision Support System (DDSS) intended to support pediatric residents’ diagnostic decisions. Research on\\u000a cognitive biases in Bayesian decision tasks is discussed. The design of the DDSS is briefly outlined, and a formative usefulness\\u000a test is reported. Under the assumption that a

Gitte Lindgaard; Janette Folkens; Catherine Pyper; Monique Frize; Robin Walker

296

UCSD's Automated Merit Processing System.  

ERIC Educational Resources Information Center

The University of California San Diego replaced its manual staff merit-increase-recommendation process with an online computer program to reduce workloads and improve the quality of the final recommendations. The highly successful system has been enthusiastically embraced by the campus community and recognized by the National Association of…

Merryman, Robert; Johnson, Judy R.; Block, Ron

1998-01-01

297

VLSI Mixed Signal Processing System.  

National Technical Information Service (NTIS)

An economical and efficient VLSI implementation of a mixed signal processing system (MSP) is presented in this paper. The MSP concept is investigated and the functional blocks of the proposed MSP are described. The requirements of each of the blocks are d...

A. Alvarez A. B. Premkumar

1993-01-01

298

VLSI mixed signal processing system  

NASA Technical Reports Server (NTRS)

An economical and efficient VLSI implementation of a mixed signal processing system (MSP) is presented in this paper. The MSP concept is investigated and the functional blocks of the proposed MSP are described. The requirements of each of the blocks are discussed in detail. A sample application using active acoustic cancellation technique is described to demonstrate the power of the MSP approach.

Alvarez, A.; Premkumar, A. B.

1993-01-01

299

Diagnostic immunohistochemistry of tumors of the central nervous system.  

PubMed

The hopes of the early eighties for detecting a marker which would be specific for tumor cells as such or for a tumor of specific tissue or organ differentiation line have not been fulfilled. Thus, a tumor marker is a substance the level of which increases but which is not unique for tumor cells. The marker may be localized within the neoplastic cell or on its surface. The marker may also be produced by the tumor-surrounding tissue under the influence of the tumor. Therefore, the results of identifying the markers should be interpreted with great caution and should be always confronted with the routine results of light microscopy as well as other studies. This is so even if the results greatly enrich the diagnosis. The diagnostic procedures should be based also on fully standardized laboratory techniques (Taylor 1992). PMID:7889332

Szyma?, J

1994-01-01

300

The Diagnostic Challenge Competition: Probabilistic Techniques for Fault Diagnosis in Electrical Power Systems  

NASA Technical Reports Server (NTRS)

Reliable systems health management is an important research area of NASA. A health management system that can accurately and quickly diagnose faults in various on-board systems of a vehicle will play a key role in the success of current and future NASA missions. We introduce in this paper the ProDiagnose algorithm, a diagnostic algorithm that uses a probabilistic approach, accomplished with Bayesian Network models compiled to Arithmetic Circuits, to diagnose these systems. We describe the ProDiagnose algorithm, how it works, and the probabilistic models involved. We show by experimentation on two Electrical Power Systems based on the ADAPT testbed, used in the Diagnostic Challenge Competition (DX 09), that ProDiagnose can produce results with over 96% accuracy and less than 1 second mean diagnostic time.

Ricks, Brian W.; Mengshoel, Ole J.

2009-01-01

301

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

302

What Happens Along the Diagnostic Pathway to CHD Treatment? Qualitative Results Concerning Cognitive Processes  

PubMed Central

Extensive research on health disparities documents persistent differential diagnosis and treatment of many conditions according to patient characteristics, physician attributes, and healthcare systems. Less is known about how physicians arrive at their decisions. We use qualitative data from a vignette-based factorial experiment to examine how physicians reason through and account for their clinical decisions, and how variations arise despite the presentation of identical symptoms of CHD. We find that physicians show evidence of cognitive biases but also actively interpret social characteristics they deem relevant to medical treatment. In an uncertain clinical context, these diagnostic pathways expose key junctures wherein physicians are detoured to alternative diagnoses, their certainty of CHD lowered, and scientific logic makes it difficult to return to a CHD diagnosis—thereby providing a fuller picture of why some cases are counted as CHD while others are not. These results have important implications insofar as diagnostic decisions like these contribute to the compilation of epidemiologic base rates, and are therefore used as part of Bayesian decision making to determine the probability of CHD in subsequent patients. This work resonates with social constructivist concerns regarding the ways disease categories are established and maintained, and potential sources of bias in official rates.

Lutfey, Karen E.; McKinlay, John. B.

2014-01-01

303

Automated satellite telemetry processing system  

NASA Astrophysics Data System (ADS)

In this paper we describe the design and important implementation details of the new automated system for processing satellite telemetry developedat Skobeltsyn Institute of Nuclear Physics of Moscow State University (SINP MSU) . We discuss the most common tasks and pitfall for such systems built around data stream from a single spacecraft or a single instrument, and suggest a solution that allows to quickly develop telemetry processing modules and to integrate them with an existing polling mechanism, support infrastructure and data storage in Oracle or MySQL database systems. We also demonstrate the benefits of this approach using modules for processing three different spacecraft data streams: Coronas-Photon (2009-003A), Tatiana-2 (2009-049D) and Meteor-M no.1 (2009-049A). The data format and protocols used by each of these spacecraft have distinct peculiarities, which nevertheless did not pose a problem for integrating their modules into the main system. Remote access via web interface to Oracle databases and sophisticated visualization tools create a possibility of efficient scientific exploitation of satellite data. Such a system is already deployed at the web portal of the Space Monitoring Data Center (SMDC) of SINP MSU (http://smdc.sinp.msu.ru).

Parunakian, David; Kalegaev, Vladimir; Barinova, Vera

304

Bioimpedancemetry in the diagnostics of inflammatory process in the mammary gland.  

PubMed

The changes in mammary gland bioimpedance were examined in the dynamics of the inflammatory process. Bioimpedance of affected gland was 2-3-fold lower than that of the contralateral one; normally, this difference did not exceed 10%. The phases of inflammation development were paralleled by changes in bioimpedance. During wound epithelization, impedance increased and approximated the normal level. Further increase of bioimpedance by more than 30% and its stabilization at this level attested to recurrence of inflammation, while its irreversible drop indicated devitalization the tissues. The diagnostic criterion attesting to the development of local inflammatory reaction is deviation of bioimpedance in the impaired area by more than 15% from that of the adjacent intact site. PMID:24771381

Tornuev, Yu V; Koldysheva, E V; Lapiy, G A; Molodykh, O P; Balakhnin, S M; Bushmanova, G M; Semenov, D E; Preobrazhenskaya, V K

2014-01-01

305

DIARES-IPM: a diagnostic advisory rule-based expert system for integrated pest management in Solanaceous crop systems  

Microsoft Academic Search

This paper presents a DIagnostic Advisory Rule-based Expert System for Integrated Pest Management (DIARES-IPM) in Solanaceous crops. DIARES-IPM is an operational automatic identification tool that helps non-experts to identify pests (insects, diseases, nutritional deficiencies and beneficial insects) and suggest the appropriate treatments. The objective of this expert system was to serve as a diagnostic, extension and educational tool in vegetable

B. D. Mahaman; H. C. Passam; A. B. Sideridis; C. P. Yialouris

2003-01-01

306

Toyota Hybrid Electric Vehicles (HEVs) Technical System Overview and Diagnostics  

NSDL National Science Digital Library

This resource contains two short courses created by Toyota Motors for training technicians on the operation and diagnosis of their HEVs. Of the two included courses, one is focused on the overview of HEV systems and the second is on HEV diagnosis. Each course is composed of individual modules that can also be taught separately with each containing lab activities and additional supplemental materials that can be used for presentations or student handouts. The first course is titled âHEV Overviewâ and includes the following modules: (1) Hybrid System Overview, (2) Hybrid System Operation, (3) High-Voltage Battery, (4) Engine, (5) Chassis, and (6) Body Electrical. The course is titled âHEV Diagnosisâ and includes the following modules: (1) Principals of Operations, (2)Engine Control System, (3) Fuel and EVAP System, (4) Hybrid Vehicle Control System, (5) High-Voltage Battery Control System, (6) Brake System, (7) Electric Power System, and (8) Other Systems.

Autoshop 101

307

Note: neutron bang time diagnostic system on Shenguang-III prototype.  

PubMed

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 10(7). 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. PMID:24784686

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

2014-04-01

308

[Identification of therapeutic and diagnostic targets through yeast two hybrid system: molecular biology in medicine].  

PubMed

In the last decades, molecular biology development was driven medicine, mainly in identification of novel therapeutic and diagnostics targets. In cells, proteins are the main responsible for the functioning of all cellular processes, from DNA synthesis to RNA and protein production, transport of cellular components and structural composition of the cell. Proteins are also an important component of signaling pathways between cells. Studies show that proteins normally do not function as singular units but as protein complexes. Understand protein interactions and discover compounds that interfere with such protein complexes are important to develop new pharmacologic treatments. There are already some drugs with such characteristics. Trichostatin A, a histone diacetilase, acts in Phosphatase protein 1 - Histone diacetilase complex, being a good target for anti-cancer therapy. In 1989, in a revolutionary way, Fields and Songs developed the Yeast Two Hybrid system (YTH). This method is based in the genetic properties of Saccharomyces cerevisiae and allows the detection of protein interactions in vivo. Since its development it suffered a few modifications that allowed its application in translational medicine. For example, this technique allows a high throughput screening to assess if a drug can interfere with a protein interaction. In the other hand, YTH can be used to ascertain which proteins interact with a protein of interest in a specific tissue (for example, brain or testis). Thus it is possible to unveil protein functions, signaling pathways and tissue functions. The great amount of data produced with YTH allows the identification and validation of diagnostic and therapeutic targets and also the development of new drugs. This review has the purpose to clarify the YTH system function and its contribution in identification of new pharmacologic treatments. PMID:23534595

Freitas, Maria João; Korrodi-Gregório, Luís; Esteves, Sara; Fardilha, Margarida

2012-01-01

309

Blast wave diagnostic for the petawatt laser system  

SciTech Connect

We report on a diagnostic to measure the trajectory of a blast wave propagating through a plastic target 400 {micro}m thick. This blast wave is generated by the irradiation of the front surface of the target with {approximately} 400 J of 1 {micro}m laser radiation in a 20 ps pulse focused to a {approximately} 50 {micro}m diameter spot, which produces an intensity in excess of 1O{sup 18} W/cm{sup 2}. These conditions approximate a point explosion and a blast wave is predicted to be generated with an initial pressure nearing 1 Gbar which decays as it travels approximately radially outward from the interaction region We have utilized streaked optical pyrometry of the blast front to determine its time of arrival at the rear surface of the target Applications of a self-similar Taylor-Sedov blast wave solution allows the amount of energy deposited to be estimated The experiment, LASNEX design simulations and initial results are discussed.

Budil, K. S., LLNL

1998-06-03

310

Blast wave diagnostic for the Petawatt laser system  

SciTech Connect

We report on a diagnostic to measure the trajectory of a blast wave propagating through a plastic target 400 {mu}m thick. This blast wave is generated by the irradiation of the front surface of the target with {approximately}400 J of 1 {mu}m laser radiation in a 20 ps pulse focused to a {approximately}50 {mu}m diameter spot, which produces an intensity in excess of 10{sup 18}thinspW/cm{sup 2}. These conditions approximate a point explosion and a blast wave is predicted to be generated with an initial pressure nearing 1 Gbar which decays as it travels approximately radially outward from the interaction region. We have utilized streaked optical pyrometry of the blast front to determine its time of arrival at the rear surface of the target. Applications of a self-similar Taylor{endash}Sedov blast wave solution allows the amount of energy deposited to be estimated. The experiment, LASNEX design simulations and initial results are discussed. {copyright} {ital 1999 American Institute of Physics.}

Budil, K.S.; Gold, D.M.; Estabrook, K.G.; Remington, B.A.; Kane, J.; Bell, P.M.; Pennington, D.; Brown, C.; Hatchett, S.; Koch, J.A.; Key, M.H.; Perry, M.D. [Lawrence Livermore National Laboratory, P.O. Box 808, L-21, Livermore, California 94550 (United States)] [Lawrence Livermore National Laboratory, P.O. Box 808, L-21, Livermore, California 94550 (United States)

1999-01-01

311

Upgraded Gyrotron System for Millimeter-Wave Processing of Materials  

Microsoft Academic Search

Main components of the prototype 10 kW CW 30 GHz gyrotron system for millimeter-wave processing of materials have been considerably improved. Modifications have been introduced into the design of the gyrotron, transmission line, microwave furnace, and temperature diagnostics and control subsystems. This has made it possible to increase the millimeter-wave power feeding the furnace by more than 1.5 times, significantly

Yurii Bykov; Gregory Denisov; Anatolii Eremeev; Arkadii Gol'denberg; Vladislav Holoptsev; Aleksei Luchinin; Vladimir Semenov

1999-01-01

312

Evaluation Of Vibration-Monitoring Gear-Diagnostic System  

NASA Technical Reports Server (NTRS)

Report describes experimental evaluation of commercial electronic system designed to monitor vibration signal from accelerometer on gear-box to detect vibrations indicative of damage to gears. System includes signal-conditioning subsystem and personal computer in which analog-to-digital converter installed. Results show system fairly effective in detecting surface fatigue pits on spur-gear teeth.

Townsend, Dennis P.; Zakrajsek, James J.

1995-01-01

313

A COMPUTING ENVIRONMENT INTEGRATING DIAGNOSTICS AND CONTROL FOR REACTOR SYSTEMS  

Microsoft Academic Search

This paper describes the Plant Computing Environment (PCE), a distributed computing environment supporting a high-level supervisory control and monitoring system. The goal is to coordinate plant fault detection, performance monitoring, and control system settings, so that the plant continues to meet performance specifications as plant conditions change. The study is aimed at future nuclear reactor systems. The PCE is a

James A. Mullens; José March-Leuba; Richard T. Wood; Carlton R. Brittain

314

Condensation Processes in Geothermal Systems  

NASA Astrophysics Data System (ADS)

We model condensation processes in geothermal systems to understand how this process changes fluid chemistry. We assume two processes operate in geothermal systems: 1) condensation of a vapor phase derived by boiling an aqueous geothermal fluid into a cool near surface water and 2) condensation of a magmatic vapor by a deep circulating meteoric thermal fluid. It is assumed that the condensation process has two stages. Initially the condensing fluid is under saturated in gaseous species. Condensation of the vapor phase continues until the pressure on the fluid equals the sum of the partial pressures of water and the dissolved gaseous species. At that time bubbles flux through the condensing fluid. In time the fluid and fluxing gas phase come to equilibrium. Calculation shows that during the second stage of the condensation process the liquid phase becomes enriched in more soluble gaseous species like CO2 and H2S, and depleted in less soluble species like CH4 and N2. Stage 2 condensation processes can therefore be monitored by ratios of more and less condensable species like CO2/N2. Condensation of vapor released by boiling geothermal fluids results in liquids with high concentrations of H2S and CO2 like is seen in geothermal system steam-heated waters. Condensation of a magmatic vapor into circulating meteoric water has been proposed, but not well demonstrated. We compare to our models the Cerro Prieto, Mexico gas analysis data set collected over twelve years time by USGS personnel. It was assumed for modeling that the Cerro Prieto geothermal fluids are circulating meteoritic fluids with N2/Ar ratios about 40 to which is added a magmatic vapor with N2/Ar ratio = 400. The Cerro Prieto analyses show a strong correlation between N2/Ar and CO2/N2 as predicted by calculation. Two dimensional image plots of well N2/Ar + CO2/N2 show a bull's-eye pattern on the geothermal field. Image plots of analyses collected over a year or less time show N2/Ar and CO2/N2 hot spots. Plotting data for individual wells show a hysteresis like loops on time vs. CO2/N2 diagrams. Our analysis demonstrates that condensation of magmatic vapor into convecting meteoric waters is a viable process. Condensation explains variations in Cerro Prieto geothermal system gas chemistry and is compatible with helium isotope data. Locally condensation appears to wax and wane over a time periods of about 10 years.

Norman, D. I.; Moore, J. N.

2005-12-01

315

Living in negotiation: patients' experiences of being in the diagnostic process of COPD  

PubMed Central

Purpose To illuminate patients’ lived experiences of going through the process of being diagnosed with chronic obstructive pulmonary disease (COPD). Patients and methods A phenomenological-hermeneutic analysis was applied in the interpretation of interviews with eight persons diagnosed with mild or moderate COPD. Results One main theme ‘living in negotiation’, and three themes ‘living with a body out of step with the diagnosis’, ‘dealing with the past’, and ‘being challenged by the future’ reflected the process participants were living through in their quest for acceptance and a new balance in life. Participants found that the diagnostic processes were confusing, and that the diagnosis itself was ‘a slap in the face’. Unclear messages gave rise to fluctuating between an understanding of the condition as ‘not too severe’, insecurity, and fear. Shame and guilt related to the diagnosis had origins in the past, and in combination with the idea of ‘chronic’ the COPD diagnosis interfered with the present moment and gave rise to uncertainty for the future. The understanding of the present is related to negotiations not only with the past, but also with the future. Thus temporal aspects of the diagnosis are of great significance for the process of finding acceptance. Conclusion Regardless of disease severity, the diagnosis seems to be a breakdown of life, which puts life itself at stake. Medical professionals should be aware that the way the diagnosis is disclosed and communicated has considerable significance for how individuals understand and deal with their illness. The diagnosis should be communicated face-to-face, clearly and with empathy, and followed by information about COPD. Physicians should allow time and listen to the patients’ stories, and thus develop a shared understanding of the temporal aspect of the illness and patients’ needs and concerns. Thus, good communication is essential in determining whether the patient remains in negotiation, or enters a process toward acceptance and new understanding.

Lindgren, Sari; Storli, Sissel Lisa; Wiklund-Gustin, Lena

2014-01-01

316

TPX diagnostics for tokamak operation, plasma control and machine protection  

SciTech Connect

The diagnostics for TPX are at an early design phase, with emphasis on the diagnostic access interface with the major tokamak components. Account has to be taken of the very severe environment for diagnostic components located inside the vacuum vessel. The placement of subcontracts for the design and fabrication of the diagnostic systems is in process.

Edmonds, P.H. [Texas Univ., Austin, TX (United States). Fusion Research Center; Medley, S.S.; Young, K.M. [Princeton Univ., NJ (United States). Plasma Physics Lab.] [and others

1995-08-01

317

Diagnostic Solution Assistant cornerstone for intelligent system monitoring, management, analysis and administration  

NASA Astrophysics Data System (ADS)

The Diagnostic Solution Assistant (DSA) provides diagnostics for space hardware and subsystems. Advanced Honewell `smart' model-based technology performs the real-time fault detection, isolation and diagnostics. This model-based technology provides 24-hour access to the operational knowledge of the system experts. The complexity of the International Space Station (ISS) and other manned space vehicles requires that a full staff of ground based system diagnosis experts be trained and available at all times. Response to critical situations must be immediate no matter what time of the day or night. Installation of new systems plus normal staff turnover cause personnel to be in training constantly. Domain knowledge lost due to staff attrition may also never be regained. All of these factors lead to higher cost ground based flight system monitoring stations and sub-optimal efficiency. The Diagnostic Solution Assistant (DSA) provides a solution to these issues. The DSA can be deployed into the ISS Mission Control Center to enhance Flight Controller awareness and decision making. DSA can be utilized onboard the vehicle to enhance crew awareness and potentially offload the crew in time- or safety-critical situations. The DSA can be used to isolate and diagnose faults during flight preparation, thus reducing the overall vehicle turn-around time. In addition to having diagnostic capability, DSA is a tremendous requirements and operations knowledge capture tool that could streamline training for the flight controller and crew, and facilitate the rapid location of important information. .

Aaseng, Gordon; Holland, Courtney; Nelson, Bill

2000-01-01

318

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

319

Principles of building calibration-free optical systems for biomedical diagnostics  

NASA Astrophysics Data System (ADS)

The construction principles of `calibration-free' optoelectronic systems of biomedical diagnostics are considered. This systems eliminate as much as possible methodical errors caused by the changes of instrumental constants of emitting-receiving and recording blocks, by the pollution of optical surfaces, by the state of used cuvettes, etc. The evaluation of accuracy of proposed methods is given.

Kugeiko, Michail M.

1998-01-01

320

Principles of development of calibration-free systems of optical biomedical diagnostics  

NASA Astrophysics Data System (ADS)

The principles of development of 'calibration-free' optoelectronic systems of biomedical diagnostics are considered. This system eliminates as much methodical errors caused by the changes of instrumental constants of emitting- receiving and recording blocks, by the pollution of optical surface, by the state of sued cuvettes, etc. The evaluation of accuracy of proposed methods is given.

Kugeiko, Michail M.; Barkova, Alla V.

2001-08-01

321

Principles of building calibration-free optical systems for biomedical diagnostics  

NASA Astrophysics Data System (ADS)

The construction principles of `calibration-free' optoelectronic systems of biomedical diagnostics are considered. This systems eliminate as much as possible methodical errors caused by the changes of instrumental constants of emitting-receiving and recording blocks, by the pollution of optical surfaces, by the state of used cuvettes, etc. The evaluation of accuracy of proposed methods is given.

Kugeiko, Michail M.

1997-12-01

322

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.

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

2013-01-01

323

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; Lee, Luke P

2013-01-01

324

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

325

Diagnostic Assessment of Troubleshooting Skill in an Intelligent Tutoring System.  

ERIC Educational Resources Information Center

This paper lays out the rationale and implementation of student modeling and updating in the HYDRIVE intelligent tutoring system (ITS) for aircraft hydraulic systems. An epistemic level of modeling concerns the plans and goals students are using to guide their problem solving, as inferred from specific actions in specific contexts. These results…

Gitomer, Drew H.; And Others

326

A System for Micro\\/Nano Fluidic Flow Diagnostics  

Microsoft Academic Search

A system for flow measurement in micro\\/nano fluidic components is presented. Microfabricated arrays of straight channels with noncircular cross-sections were used for flow rate measurement. The calculated flow rates in these channels were determined using a finite difference approximation method. A pneumatic pumping system was utilized to control the pressure drop across the channels and flow rates were measured by

Pulak Nath; Shuvo Roy; Terrence Conlisk; Aaron J. Fleischman

2005-01-01

327

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

328

Self-diagnostic thermal protection systems for future spacecraft  

Microsoft Academic Search

The thermal protection system (TPS) represents the greatest risk factor after propulsion for any transatmospheric mission (Dr. Charles Smith, NASA ARC). Any damage to the TPS leaves the space vehicle vulnerable and could result in the loss of human life as happened in the Columbia accident. Aboard the current Space Shuttle Orbiters no system exists to notify the astronauts or

Alaina B. Hanlon

2008-01-01

329

Comparison and Applications of DPV-2000 and Accuraspray-g3 Diagnostic Systems  

NASA Astrophysics Data System (ADS)

Comparative in-flight measurements of particles plasma sprayed by F4 and Triplex II guns were carried out using the diagnostic systems DPV-2000 and Accuraspray-g3. The comparison of mean particle velocities and temperatures as well as intensity profiles of the plume show a good agreement confirming their accuracy. However, the varying operating principles especially the deceased dimensions of the measurement volumes have to be considered carefully when evaluating the results. Furthermore, some applications of the diagnostic systems DPV-2000 and Accuraspray-g3 are shown. Finally some application limits, which were identified for certain powder compositions at higher plasma power levels will be discussed.

Mauer, Georg; Vaßen, Robert; Stöver, Detlev

2007-09-01

330

Knowledge based jet engine diagnostics  

NASA Technical Reports Server (NTRS)

A fielded expert system automates equipment fault isolation and recommends corrective maintenance action for Air Force jet engines. The knowledge based diagnostics tool was developed as an expert system interface to the Comprehensive Engine Management System, Increment IV (CEMS IV), the standard Air Force base level maintenance decision support system. XMAM (trademark), the Expert Maintenance Tool, automates procedures for troubleshooting equipment faults, provides a facility for interactive user training, and fits within a diagnostics information feedback loop to improve the troubleshooting and equipment maintenance processes. The application of expert diagnostics to the Air Force A-10A aircraft TF-34 engine equipped with the Turbine Engine Monitoring System (TEMS) is presented.

Jellison, Timothy G.; Dehoff, Ronald L.

1987-01-01

331

ETHERNET BASED EMBEDDED SYSTEM FOR FEL DIAGNOSTICS AND CONTROLS  

SciTech Connect

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 software packages such as Experimental Physics and Industrial Control System (EPICS) and Real Time Executive for Multiprocessor System (RTEMS) running as an Input/Output Controller (IOC). By cross compiling with the EPICS, the RTEMS kernel, IOC device supports, and databases all of these can be downloaded into the microcontroller. The first version of the BPM electronics based on the embedded controller was built and is currently running in our FEL system. The new version of BPM that will use a Single Board IOC (SBIOC), which integrates with an Field Programming Gate Array (FPGA) and a ColdFire embedded microcontroller, is presently under development. The new system has the features of a low cost IOC, an open source real-time operating system, plug&play-like ease of installation and flexibility, and provides a much more localized solution.

Jianxun Yan; Daniel Sexton; Steven Moore; Albert Grippo; Kevin Jordan

2006-10-24

332

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

333

TMX-U neutral pressure measurement diagnostic systems  

Microsoft Academic Search

The tandem mirror experiment-upgrade (TMX-U) has a large and complex system of Baird Alpert, magnetron, and Penning gauges, in addition to mass spectrometers (RGA), all of which measure neutral pressures in the many internal regions of TMX-U. These pressure measurements are used as part of the confinement physics data base as well as for management of the TMX-U vacuum system.

W. L. Pickles; S. L. Allen; D. N. Hill; A. L. Hunt; T. C. Simonen

1984-01-01

334

Self-diagnostic thermal protection systems for future spacecraft  

NASA Astrophysics Data System (ADS)

The thermal protection system (TPS) represents the greatest risk factor after propulsion for any transatmospheric mission (Dr. Charles Smith, NASA ARC). Any damage to the TPS leaves the space vehicle vulnerable and could result in the loss of human life as happened in the Columbia accident. Aboard the current Space Shuttle Orbiters no system exists to notify the astronauts or ground control if the thermal protection system has been damaged. Through this research, a proof-of-concept monitoring system was developed. The system has two specific applications for thermal protection systems: (1) Improving models used to predict thermal and mechanical response of TPS materials, and (2) Self-diagnosing damage within regions of the TPS and communicating the damage to the appropriate personnel over a potentially unstable network. Mechanical damage is among the most important things to protect the TPS against. Methods to detect the primary types of mechanical damage suffered by thermal protection systems have been developed. Lightweight, low-power sensors were developed to detect any cracks in small regions of a TPS. Implementation of a network of these sensors within 10's to 1000's of regions will eventually provide high spatial resolution of damage detection; allowing for detection of holes in the TPS. Also important in thermal protection material development is to know the ablation rates and time/temperature response of the materials. A new type of sensor has been developed to monitor temperature at different depths within thermal protection materials. The signals being transmitted through the sensors can be multiplexed to allow for mechanical damage and temperature to be monitored using the same sensor.

Hanlon, Alaina B.

335

A vibration monitoring acquisition and diagnostic system for helicopter drive train bench tests  

NASA Astrophysics Data System (ADS)

An automated drive train test stand vibration monitoring system called VMADS has been developed by Bell Helicopter Textron, Inc., and has been installed at Bell's transmission bench test facility. VMADS provides the operator with warning and alarm indications for preselected degraded conditions, and acquires vibration data to be used by engineers to improve the diagnostics for better fault detection and fault isolation. VMADS is used as a test bed for new monitoring and diagnostic algorithm evaluation and validation, a necessary step to ensure development of accurate, reliable integrated health usage monitoring systems for the Bell rotorcraft fleet. This paper highlights the VMADS features for helicopter and tiltrotor aircraft drive train bench test monitoring and diagnostics and discusses supportive ongoing health and usage monitoring activities at BHTI, both military and commercial for enhanced safety and reduced maintenance costs. Bell is translating VMADS developed capability to airborne applications, while simultaneously enhancing the original VMADS capabilities.

Dousis, Dimitri A.

336

[Content-based image-retrieval system - development, usefulness and perspectives of diagnostic assistant robot].  

PubMed

In recent years, diagnostic imaging modalities have proliferated from standard X-ray to CT, MRI and PET, and the working environments of radiologists have changed greatly with the popular spread of the PACS system. Radiologists are now facing enormous duties due to the dramatic increase in the volume of images from various modalities, and the shortage of radiologists in Japan has reached near-crisis levels. Furthermore, it is difficult to gain the knowledge needed to interpret diagnostic imaging and modalities under the growing, increasingly diverse and complex modalities and methods, for general physicians and trainees. On the other hand, there are some computer-aided diagnosis and detection systems that support radiologists. Here, we introduce a new diagnostic assistant robot that automatically retrieves cases on record that are similar to new cases, helps in making diagnoses, and can create CT reports semi-automatically, using an existing past CT database of pulmonary nodules with a structured report. PMID:22790038

Endo, Masahiro; Aramaki, Takeshi; Moriguchi, Michihisa; Sawada, Akihiro; Asakura, Koiku; Bekku, Emima; Yamaguchi, Ken

2012-07-01

337

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.

2013-01-01

338

Spatial imaging detector system for pulsed plasma extreme ultraviolet diagnostics  

NASA Astrophysics Data System (ADS)

A spectroscopic instrumentation system is described which forms one-dimensional monochromatic EUV images of pulsed plasma sources. The system uses a small monochromator and a 22 anode microchannel plate detector to simultaneously view 22 chords of the plasma at the wavelength of a given impurity emission with 100 microsec resolution. Brightness profiles are measured and stored in a minicomputer at up to 400 time points during a single discharge. If the discharge is cylindrically symmetric, this data can be Abel-inverted directly to produce the volume emission rates and impurity density profiles during the discharge. The design, construction, and testing of the system are described, as well as its performance on the Alcator A tokamak.

Richards, R. K.; Moos, H. W.; Allen, S. L.

1980-01-01

339

TMX-U neutral pressure measurement diagnostic systems  

SciTech Connect

The Tandem Mirror Experiment-Upgrade (TMX-U) has a large and complex system of Baird Alpert, magnetron, and Penning gauges, in addition to mass spectrometers (RGA), all of which measure neutral pressures in the many internal regions of TMX-U. These pressure measurements are used as part of the confinement physics data base as well as for management of the TMX-U vacuum system. Dynamic pressures are modeled by a coupled-volumes simulation code, which includes wall reflus, getter pumping, and plasma pumping.

Pickles, W.L.; Allen, S.L.; Hill, D.N.; Hunt, A.L.; Simonen, T.C.

1984-09-14

340

TMX-U neutral pressure measurement diagnostic systems  

NASA Astrophysics Data System (ADS)

The tandem mirror experiment-upgrade (TMX-U) has a large and complex system of Baird Alpert, magnetron, and Penning gauges, in addition to mass spectrometers (RGA), all of which measure neutral pressures in the many internal regions of TMX-U. These pressure measurements are used as part of the confinement physics data base as well as for management of the TMX-U vacuum system. Dynamic pressures are modeled by a coupled-volumes simulation code, which includes wall reflux, getter pumping, and plasma pumping.

Pickles, W. L.; Allen, S. L.; Hill, D. N.; Hunt, A. L.; Simonen, T. C.

1984-09-01

341

Effects on operators' problem solving behaviour when using a diagnostic rule-based expert system developed for the nuclear industry  

Microsoft Academic Search

The authors describe an experiment conducted at the OECD Halden Reactor Project, Halden, Norway, to assess the effect on the diagnostic behaviour of nuclear power plant operators when using a rule-based diagnostic expert system. The rule-based expert system used is called DISKET (Diagnosis System Using Knowledge Engineering Technique). The experiment used a full scope pressurized water reactor simulator. Operator performance

Tor Endestad; C. B. O. Holmstroem; F. S. Volden

1992-01-01

342

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

343

The Introduction of a Diagnostic Decision Support System (DXplain™) into the workflow of a teaching hospital service can decrease the cost of service for diagnostically challenging Diagnostic Related Groups (DRG)s  

PubMed Central

Background In an era of short inpatient stays, residents may overlook relevant elements of the differential diagnosis as they try to evaluate and treat patients. However, if a resident’s first principal diagnosis is wrong, the patient’s appropriate evaluation and treatment may take longer, cost more, and lead to worse outcomes. A diagnostic decision support system may lead to the generation of a broader differential diagnosis that more often includes the correct diagnosis, permitting a shorter, more effective, and less costly hospital stay. Methods We provided residents on General Medicine services access to DXplain, an established computer-based diagnostic decision support system, for 6 months. We compared charges and cost of service for diagnostically challenging cases seen during the fourth through sixth month of access to DXplain (intervention period) to control cases seen in the six months before the system was made available. Results 564 cases were identified as diagnostically challenging by our criteria during the intervention period along with 1173 cases during the control period. Total charges were $1281 lower (P=.006), Medicare Part A charges $1032 lower (p=.006) and cost of service $990 lower (P=.001) per admission in the intervention cases than in control cases. Conclusions Using DXplain on all diagnostically challenging cases might save our medical center over $2,000,000 a year on the General Medicine Services alone. Using clinical diagnostic decision support systems may improve quality and decrease cost substantially at teaching hospitals.

Elkin, Peter L.; Liebow, Mark; Bauer, Brent A.; Chaliki, Swarna; Wahner-Roedler, Dietlind; Bundrick, John; Lee, Mark; Brown, Steven H.; Froehling, David; Bailey, Kent; Famiglietti, Kathleen; Kim, Richard; Hoffer, Ed; Feldman, Mitchell; Barnett, G. Octo

2010-01-01

344

TMX-U Neutral Pressure Measurement Diagnostic Systems.  

National Technical Information Service (NTIS)

The Tandem Mirror Experiment-Upgrade (TMX-U) has a large and complex system of Baird Alpert, magnetron, and Penning gauges, in addition to mass spectrometers (RGA), all of which measure neutral pressures in the many internal regions of TMX-U. These pressu...

W. L. Pickles S. L. Allen D. N. Hill A. L. Hunt T. C. Simonen

1984-01-01

345

Development of the Beam Diagnostics System for the J-PARC Rapid-Cycling Synchrotron  

Microsoft Academic Search

Development of the beam diagnostics system for the J-PARC Rapid-Cycling Synchrotron is described. The system consists of Beam Position Monitor (BPM), Beam Loss Monitor (BLM), Current monitors (DCCT, SCT, MCT, FCT, WCM), Tune monitor system, 324MHz-BPM, Profile monitors, and Halo monitor. The BPM is electro-static type and its electronics is designed for both COD and turn-by-turn measurements. Five current monitors

N. Hayashi; S. Hiroki; J. Kishiro; Y. Teruyama; R. Toyokawa; D. Arakawa; S. Lee; T. Miura; T. Toyama

2005-01-01

346

Design Considerations for an Integrated Solar Sail Diagnostics System  

NASA Technical Reports Server (NTRS)

Efforts are continuing under NASA support to improve the readiness level of solar sail technology. Solar sails have one of the best chances to be the next gossamer spacecraft flown in space. In the gossamer spacecraft community thus far, solar sails have always been considered a "low precision" application compared with, say, radar or optical devices. However, as this paper shows, even low precision gossamer applications put extraordinary demands on structural measurement systems if they are to be traceable to use in space.

Jenkins, Christopher H. M.; Gough, Aaron R.; Pappa, Richard S.; Carroll, Joe; Blandino, Joseph R.; Miles, Jonathan J.; Rakoczy, John

2004-01-01

347

A comparison of five diagnostic systems for childhood schizophrenia and infantile autism  

Microsoft Academic Search

Five diagnostic systems designed to differentiate infantile autism and early childhood schizophrenia were compared by deriving scores on 44 children referred consecutively to the same clinical center. While the autistic scales devised by Rimland, Polan and Spencer, Lotter, and the British Working Party correlated significantly, the degree of correspondence (35%) indicated that several children obtained high autistic scores in one

Marian K. DeMyer; Don W. Churchill; William Pontius; Katherine M. Gilkey

1971-01-01

348

Fault diagnostic instrumentation design for environmental control and life support systems  

NASA Technical Reports Server (NTRS)

As a development phase moves toward flight hardware, the system availability becomes an important design aspect which requires high reliability and maintainability. As part of continous development efforts, a program to evaluate, design, and demonstrate advanced instrumentation fault diagnostics was successfully completed. Fault tolerance designs for reliability and other instrumenation capabilities to increase maintainability were evaluated and studied.

Yang, P. Y.; You, K. C.; Wynveen, R. A.; Powell, J. D., Jr.

1979-01-01

349

Diagnostic Validity of the McCarron-Dial System in Neuropsychological Rehabilitation Assessment.  

ERIC Educational Resources Information Center

The diagnostic validity of the McCarron Dial System, a neuropsychologically-based vocational evaluation battery, in discriminating between brain damaged and non-brain damaged clients was evaluated. Multiple discriminant analysis indicated that 89% of the subjects were correctly classified. (Author/DB)

Chan, Fong; Dial, Jack G.

1987-01-01

350

Telemetric measuring system for the diagnostics of heart rate variability-VariaPulse TF  

Microsoft Academic Search

Summary form only given. Heart rate variability (HRV) is an important marker in the diagnostics of some diseases associated with autonomic nervous system (ANS) dysfunctions. One of the advanced methods is the spectral analysis of heart rate variations (SAHRV). Early diagnosis of ANS disfunction is very important from the point of view of prevention and subsequent therapy. This fact served

R. Vychodil; J. Sabinger; J. Novotny

1997-01-01

351

A vibration monitoring acquisition and diagnostic system for helicopter drive train bench tests  

Microsoft Academic Search

An automated drive train test stand vibration monitoring system called VMADS has been developed by Bell Helicopter Textron, Inc., and has been installed at Bell's transmission bench test facility. VMADS provides the operator with warning and alarm indications for preselected degraded conditions, and acquires vibration data to be used by engineers to improve the diagnostics for better fault detection and

Dimitri A. Dousis

1992-01-01

352

Evaluating the Diagnostic Validity of a Facet-Based Formative Assessment System  

ERIC Educational Resources Information Center

This paper describes methods for an alignment study and psychometric analyses of a formative assessment system, Diagnoser Tools for physics. Diagnoser Tools begin with facet clusters as the interpretive framework for designing questions and instructional activities. Thus each question in the diagnostic assessments includes distractors that…

DeBarger, Angela Haydel; DiBello, Louis; Minstrell, Jim; Feng, Mingyu; Stout, William; Pellegrino, James; Haertel, Geneva; Harris, Christopher; Ructinger, Liliana

2011-01-01

353

Performance-Oriented Electric Motors Diagnostics in Modern Energy Conversion Systems  

Microsoft Academic Search

This paper presents the analysis of a performance- oriented electric motors diagnostics in modern energy conversion system. With increased demand for electrical energy in world industries, the population of energy conversion devices such as generators\\/motors has greatly increased. As emerging and not being a mature enough technology in the application of renewable energy conversion or electric-drive transportation, the protection and

Seungdeog Choi; Bilal Akin; Mina M. Rahimian; Hamid A. Toliyat

2012-01-01

354

Design for viable organizations : The diagnostic power of the viable system model  

Microsoft Academic Search

Purpose – This paper attempts to underpin the theoretical claim of the viable system model to specify the necessary and sufficient preconditions of organizations for viability. Design\\/methodology\\/approach – A number of case studies are explored. Findings – The evidence documented in the paper both corroborates the model's claim and provides evidence of its enormous diagnostic power. Originality\\/value – The cases

Markus Schwaninger

2006-01-01

355

Evaluation of the Sorensen diagnostic criteria in the classification of systemic vasculitis  

Microsoft Academic Search

Objectives. To evaluate the use of the diagnostic criteria for Wegener's granulomatosis (WG) and microscopic polyangiitis (mPA) proposed by Sørensen et al. in the classification of primary systemic vasculitis (PSV). Methods. We applied to our cohort of PSV patients the American College of Rheumatology (ACR) criteria for WG, Churg-Strauss syndrome (CSS) and polyarteritis nodosa (PAN), the Chapel Hill Consensus Conference

R. A. Watts; T. H. W. Barker; D. G. I. Scott

2002-01-01

356

The Testing and Diagnostic System on AVR of the Movable Electricity Generating Set  

Microsoft Academic Search

AVR (Automatic Voltage Regulator) is the most important module, which can control the output voltage of generating sets, guarantee the voltage stability, improve power quality and decide the performance of electricity generating sets, so this paper introduces the design method of the AVR detecting and diagnostic system, which based on the fault database. The paper introduces the platform of the

Gao Weibo; Liu Hongwen; Gu Zhifeng; ZHao Wenjie

2011-01-01

357

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

358

Electron-optical recorder for pulse x-ray diagnostics of high-speed processes  

Microsoft Academic Search

At research of high speed gas-dynamic processes x-ray image recording method is widely applied. The informativity of this method is defined by characteristics of the x-ray image formation system, which consists from x-ray or gamma- radiation source and a system of images recording. Application of developed in RFNC VNIIEF electron-optical recorders of the x-ray images has allowed to realize multi-

Vasily V. Burtsev; Sergey E. Elfimov; Yuri M. Makarov; Andrey V. Ryzhkov

1997-01-01

359

Microcomputerized electric field meter diagnostic and calibration system  

NASA Technical Reports Server (NTRS)

A computerized field meter calibration system which includes an apparatus for testing the calibration of field meters normally utilized for measuring electromagnetic field potentials is described. A reference voltage is applied to the field meter for causing signals to be produced on the output terminals thereof. A bank of relays is provided for selectively connecting output terminals of the field meter to a multiplexer by means of a digital voltmeter and an oscilloscope. A frequency-shift-keyed receiver is also connected to one of the terminals of the field meter for transmitting and converting a frequency shift keyed signal to a digital signal which is, subsequently, applied to the multiplexer.

Holley, L. D.; Mason, J. W. (inventors)

1978-01-01

360

Coherent Synchrotron Radiation as a Diagnostic Tool for the LCLS Longitudinal Feedback System  

SciTech Connect

The Linac Coherent Light Source (LCLS) will be the world's first x-ray free-electron laser (FEL). To ensure the vitality of FEL lasing, a longitudinal feedback system is required together with other diagnostics. In this paper, we study the possibility of using Coherent Synchrotron Radiation (CSR) from the chicane as a diagnostic tool for bunch length feedback. Studies show that CSR is a good candidate, even for a non-Gaussian, double-horn longitudinal charge distribution as in the LCLS. We further check the possibility for detecting possible microbunching.

Wu, Juhao; Emma, P.; Huang, Z.; /SLAC

2005-06-15

361

Performance test of the integrator system for magnetic diagnostics in KSTAR  

SciTech Connect

Ten modules of the integrator system of the initial magnetic diagnostics for the first plasma operation have been simultaneously tested in the Korea superconducting tokamak advanced research device by measuring the magnetic flux density from various magnetic diagnostics sensors when a small current was applied to the superconducting poloidal field coils. The measured drifts from the integrators show between 1x10{sup -6} and 1x10{sup -5} Wb/s. The results from the field tests before the first plasma generation are described.

Ka, E. M.; Lee, S. G.; Bak, J. G. [National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Son, D. [Department of Physics, Hannam University, Daejeon 306-791 (Korea, Republic of)

2008-10-15

362

Use of the focusing multi-slit ion optical system at RUssian Diagnostic Injector (RUDI)  

NASA Astrophysics Data System (ADS)

The upgrade of the diagnostic neutral beam injector RUDI in 2010 was performed to increase the beam density at the focal plane in accordance with the requirements of charge-exchange recombination spectroscopy diagnostics. A new focusing ion-optical system (IOS) with slit beamlets and an enlarged aperture was optimized for 50% higher nominal beam current and reduced angular divergence with respect to the previous multi-aperture IOS version. The upgraded injector provides the beam current up to 3 A, the measured beam divergence in the direction along the slits is 0.35°. Additionally, the plasma generator was modified to extend the beam pulse to 8 s.

Listopad, A.; Coenen, J.; Davydenko, V.; Ivanov, A.; Mishagin, V.; Savkin, V.; Schweer, B.; Shulzhenko, G.; Uhlemann, R.

2012-02-01

363

Use of the focusing multi-slit ion optical system at RUssian Diagnostic Injector (RUDI)  

SciTech Connect

The upgrade of the diagnostic neutral beam injector RUDI in 2010 was performed to increase the beam density at the focal plane in accordance with the requirements of charge-exchange recombination spectroscopy diagnostics. A new focusing ion-optical system (IOS) with slit beamlets and an enlarged aperture was optimized for 50% higher nominal beam current and reduced angular divergence with respect to the previous multi-aperture IOS version. The upgraded injector provides the beam current up to 3 A, the measured beam divergence in the direction along the slits is 0.35 deg. Additionally, the plasma generator was modified to extend the beam pulse to 8 s.

Listopad, A.; Davydenko, V.; Ivanov, A.; Mishagin, V.; Savkin, V.; Shulzhenko, G. [Budker Institute of Nuclear Physics, 630090 Novosibirsk (Russian Federation); Coenen, J.; Schweer, B.; Uhlemann, R. [Trilateral Euregio Cluster, Institut fuer Energieforschung-Plasmaphysik, Forschungszentrum Juelich GmbH, Association EURATOM-KFA, 52425 Juelich (Germany)

2012-02-15

364

Systemic sclerosis - focus on dermatological aspects. Part 2: diagnostics, therapy.  

PubMed

Systemic sclerosis is a chronic inflammatory multiorgan disease which may involve the skin and internal organs to a varying extent. Pathogenetically the vasculature, connective tissue and the immune system are involved in a yet to be defined sequence and impact. Case history and results of physical as well as laboratory examinations will determine individually adapted further organ imaging or invasive procedures. Based on their results therapy is initiated which may include supportive measures such as physiotherapy as well as basic skin care and avoidance of any trauma. Many agents are available for the circulatory problems including Raynaud phenomenon and digital ulcers such as calcium channel blockers, ACE inhibitors and intravenous prostacyclin derivatives, as well as endothelin receptor blockers and phosphodiesterase inhibitors. Immunosuppressive and immunomodulatory agents are of varying efficacy depending on organ involvement. Though various therapeutic measures are available, beneficial effects are limited and associated with various unwanted effects. In any case, the therapy has to be individually adapted to the disease stage and course of the disease. PMID:23107322

Sticherling, Michael

2012-11-01

365

Rotorcraft Diagnostics  

NASA Technical Reports Server (NTRS)

Health management (HM) in any engineering systems requires adequate understanding about the system s functioning; a sufficient amount of monitored data; the capability to extract, analyze, and collate information; and the capability to combine understanding and information for HM-related estimation and decision-making. Rotorcraft systems are, in general, highly complex. Obtaining adequate understanding about functioning of such systems is quite difficult, because of the proprietary (restricted access) nature of their designs and dynamic models. Development of an EIM (exact inverse map) solution for rotorcraft requires a process that can overcome the abovementioned difficulties and maximally utilize monitored information for HM facilitation via employing advanced analytic techniques. The goal was to develop a versatile HM solution for rotorcraft for facilitation of the Condition Based Maintenance Plus (CBM+) capabilities. The effort was geared towards developing analytic and reasoning techniques, and proving the ability to embed the required capabilities on a rotorcraft platform, paving the way for implementing the solution on an aircraft-level system for consolidation and reporting. The solution for rotorcraft can he used offboard or embedded directly onto a rotorcraft system. The envisioned solution utilizes available monitored and archived data for real-time fault detection and identification, failure precursor identification, and offline fault detection and diagnostics, health condition forecasting, optimal guided troubleshooting, and maintenance decision support. A variant of the onboard version is a self-contained hardware and software (HW+SW) package that can be embedded on rotorcraft systems. The HM solution comprises components that gather/ingest data and information, perform information/feature extraction, analyze information in conjunction with the dependency/diagnostic model of the target system, facilitate optimal guided troubleshooting, and offer decision support for optimal maintenance.

Haste, Deepak; Azam, Mohammad; Ghoshal, Sudipto; Monte, James

2012-01-01

366

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

367

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  

PubMed Central

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 paper describes the design of a study that aims to study the relationship between a suboptimal diagnostic process and patient outcomes. In addition, the role of personal and circumstantial factors on the quality of the diagnostic process will be examined. Methods/Design The research questions were addressed using several data sources. First, the differential diagnosis was assessed concurrently to the diagnostic process. Second, the patient records of 248 patients suffering from shortness of breath were reviewed by expert internists in order to reveal suboptimal cognitive acts and (potential) consequences for the patient. The suboptimal cognitive acts were discussed with the treating physicians and classified with the taxonomy of unsafe acts. Third, workload, fatigue and work experience were measured during the physicians work. Workload and fatigue were measured during the physicians shift using the NASA tlx questionnaire on a handheld computer. Physicians participating in the study also answered questions about their work experience. Discussion The design used in this study provides insight into the relationship between suboptimal cognitive acts in the diagnostic process and possible consequences for the patient. Suboptimal cognitive acts in the diagnostic process and its causes can be revealed. Additional measurements of workload, fatigue and experience allow examining the influence of these factors on the diagnostic process. In conclusion, the present design provides a method with which insights in weaknesses of the diagnostic process and the effect on patient outcomes can be studied and opportunities for improvement can be obtained.

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

2009-01-01

368

An intelligent, fault tolerant, high power, distributed power system for massively parallel processing computers  

Microsoft Academic Search

An intelligent, high power distributed power system used in a massively parallel processing (MPP) computer is described. The 7.5 kW power system has high availability, redundancy, fault tolerance, battery back-up, and a user friendly graphical user interface (GUI). A diagnostic subsystem monitors and tests the operation of the power system to ensure the functionality of the redundant assemblies

J. Burns; J. Riel; A. DiBene

1994-01-01

369

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

NASA Astrophysics Data System (ADS)

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.; van Beveren, V.; Thoen, D. J.; Nuij, P. J. W. M.; de Baar, M. R.; Donné, A. J. H.; Westerhof, E.; Goede, A. P. H.; Krijger, B.; van den Berg, M. A.; Kantor, M.; Graswinckel, M. F.; Hennen, B. A.; Schüller, F. C.

2011-06-01

370

An internationally recognized quality assurance system for diagnostic parasitology in animal health and food safety, with example data on trichinellosis  

Microsoft Academic Search

A quality assurance (QA) system was developed for diagnostic parasitology and implemented for several diagnostic assays including fecal flotation and sedimentation assays, trichomonad culture assay, and the testing of pork and horse meat for Trichinella to facilitate consistently reliable results. The system consisted of a validated test method, procedures to confirm laboratory capability, and protocols for documentation, reporting, and monitoring.

Alvin A. Gajadhar; Lorry B. Forbes

2002-01-01

371

Diagnostic system of the Lawrence Livermore National Laboratory two-stage light-gas gun  

Microsoft Academic Search

A two-stage light-gas gun is used for a variety of dynamic physical-property measurements at 100 GPa (1 Mbar) pressures. The diagnostic system described here consists of a flash x-ray system to measure impactor velocity, detectors and electronics to measure shock-wave velocities with subnanosecond resolution, and data–analysis techniques that permit us to measure the tilt and distortion of the impactor and

A. C. Mitchell; W. J. Nellis

1981-01-01

372

Diagnostic system of the Lawrence Livermore National Laboratory two-stage light-gas gun  

Microsoft Academic Search

A two-stage light-gas gun is used for a variety of dynamic physical-property measurements at 100 GPa (1 Mbar) pressures. The diagnostic system described here consists of a flash x-ray system to measure impactor velocity, detectors and electronics to measure shock-wave velocities with subnanosecond resolution, and data--analysis techniques that permit us to measure the tilt and distortion of the impactor and

A. C. Mitchell; W. J. Nellis

1981-01-01

373

Development of Recombinant Nucleoprotein-Based Diagnostic Systems for Lassa Fever  

Microsoft Academic Search

Diagnostic systems for Lassa fever (LF), a viral hemorrhagic fever caused by Lassa virus (LASV), such as enzyme immunoassays for the detection of LASV antibodies and LASV antigens, were developed using the recombinant nucleoprotein (rNP) of LASV (LASV-rNP). The LASV-rNP was expressed in a recombinant baculovirus system. LASV-rNP was used as an antigen in the detection of LASV-antibodies and as

Masayuki Saijo; Marie-Claude Georges-Courbot; Philippe Marianneau; Victor Romanowski; Shuetsu Fukushi; Tetsuya Mizutani; Alain-Jean Georges; Takeshi Kurata; Ichiro Kurane; Shigeru Morikawa

2007-01-01

374

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, Tsukuba; 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, A.; /SLAC

2007-02-12

375

Beam Transport and Diagnostics for the NSLS-II Injection System  

SciTech Connect

The NSLS-II is a state of the art 3 GeV synchrotron light source being developed at BNL. The injection system will consist of a 200 MeV linac, 3 GeV booster synchrotron, and associated transfer lines. The transport lines between the linac and booster (LtB) and the booster and storage ring (BSR) must satisfy a number of requirements. In addition to transporting the beam while maintaining the beam emittance, these lines must allow for commissioning, provide appropriate diagnostics, allow for the appropriate safety devices and in the case of the BSR line, provide a stable beam for top off injection. Appropriate diagnostics are also necessary in the linac and booster to complement the measurements in the transfer lines and to allow for fast commissioning. In this paper we discuss the design of the transfer lines for the NSLSII along with the incorporated diagnostics and safety systems. Necessary diagnostics in the linac and booster are also discussed.

Fliller III,R.; Alforque, R.; Heese, R.; Meier, R.; Rose, J.; Shaftan, T.; Singh, O.; Tsoupas, N.

2009-05-04

376

Data acquisition and processing system of the electron cyclotron emission imaging system of the KSTAR tokamak  

SciTech Connect

A new innovative electron cyclotron emission imaging (ECEI) diagnostic system for the Korean Superconducting Tokamak Advanced Research (KSTAR) produces a large amount of data. The design of the data acquisition and processing system of the ECEI diagnostic system should consider covering the large data production and flow. The system design is based on the layered structure scalable to the future extension to accommodate increasing data demands. Software architecture that allows a web-based monitoring of the operation status, remote experiment, and data analysis is discussed. The operating software will help machine operators and users validate the acquired data promptly, prepare next discharge, and enhance the experiment performance and data analysis in a distributed environment.

Kim, J. B.; Lee, W.; Yun, G. S.; Park, H. K. [Department of Physics, POSTECH, San-31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk 790-784 (Korea, Republic of); Domier, C. W.; Luhmann, N. C. Jr. [Department of Applied Science, University of California at Davis, Davis, California 95616 (United States)

2010-10-15

377

Statistical Process Control System for VLSI Fabrication.  

National Technical Information Service (NTIS)

The CMU-CAM system for statistical process control of VLSI (very large scale integration) manufacturing is described. It is a software system which can perform statistical quality control and feed-forward control rescheduling on line, and process diagnosi...

A. J. Strojwas

1989-01-01

378

Diagnostic evaluation of ozone production and horizontal transport in a regional photochemical air quality modeling system  

NASA Astrophysics Data System (ADS)

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 (O 3) within the lower troposphere. Results from the Community Multiscale Air Quality (CMAQ) modeling system are evaluated against surface and upper air measurements from field studies during summer 2002 when several high O 3 episodes occurred in the eastern United States. Modeled O 3 and winds are compared to research aircraft measurements and wind profiler data, respectively, to investigate whether model underestimates of daily maximum 8-h ozone concentrations during high O 3 episodes might be attributable to discrepancies in either or both of these modeled processes. Comparisons of 10 AM surface O 3 concentrations, which are representative of O 3 levels in the residual layer aloft, revealed that model underestimation was greater at higher observed ozone levels. Mid-morning vertical ozone profiles corroborated this surface-level finding, as modeled concentrations tended to be lower than observed O 3 aloft. Net ozone production efficiency (OPE) results suggested photochemical ozone formation was comparable between the model and observations with composite OPE values of 6.7 and 7.6, respectively, within the afternoon planetary boundary layer. Evaluation of wind profiles revealed modeled wind speeds with the base four-dimensional data assimilation (FDDA) approach underestimated observed speeds by more than 2 m s -1 and direction was biased by about 20° in the nocturnal residual layer aloft as coarse resolution analysis fields involved in FDDA were found to inhibit modeled winds. These differences could produce large spatial displacements in modeled and observed ozone patterns within the region. Although sensitivity simulation results with the WRF meteorological model with FDDA using all available upper air profile observations displayed improvements in capturing wind fields aloft, CMAQ maximum 8-h O 3 results using the improved wind fields also underestimated observations.

Godowitch, James M.; Gilliam, Robert C.; Rao, S. Trivikrama

2011-08-01

379

Dynamically Reconfigurable Embedded Image Processing System  

Microsoft Academic Search

Image processing uses many data processing techniques to transform the raw data or information from a sensor system into useful information from which decisions can be made. Historically, the data processing systems associated with each image processing application were tuned or optimized to that application such as machine inspection, pattern recognition, etc. In today's environment it is desirable to quickly

Jim Nichols; Sandeep Neema

380

Self-referencing Mach-Zehnder interferometer as a laser system diagnostic: Active and adaptive optical systems  

Microsoft Academic Search

We are incorporating a novel self-referencing Mach-Zehnder interferometer into a large scale laser system as a real time, interactive diagnostic tool for wavefront measurement. The instrument is capable of absolute wavefront measurements accurate to better than λ\\/10 pv over a wavelength range > 300 nm without readjustment of the optical components. This performance is achieved through the design of both

M. Feldman; D. J. Mockler; R. E. Jr. English; J. L. Byrd; J. T. Salmon

1991-01-01

381

NASA System Engineering Design Process.  

National Technical Information Service (NTIS)

This slide presentation reviews NASA's use of systems engineering for the complete life cycle of a project. Systems engineering is a methodical, disciplined approach for the design, realization, technical management, operations, and retirement of a system...

J. Roman

2011-01-01

382

PV Manufacturing R&D Project Status and Accomplishments Under 'In-Line Diagnostics and Intelligent Processing' and 'Yield, Durability and Reliability'  

SciTech Connect

The PV Manufacturing R&D (PVMR&D) Project conducts cost-shared research and development programs with U.S. PV industry partners. There are currently two active industry partnership activities. 'In-line Diagnostics and Intelligent Processing', launched in 2002, supports development of new in-line diagnostics and monitoring with real-time feedback for optimal process control and increased yield in the fabrication of PV modules, systems, and other system components. 'Yield, Durability and Reliability', launched in late 2004, supports enhancement of PV module, system component, and complete system reliability in high-volume manufacturing. A second key undertaking of the PVMR&D Project is the collection and analysis of module production cost-capacity metrics for the U.S. PV industry. In the period from 1992 through 2005, the average module manufacturing cost in 2005 dollars fell 54% (5.7% annualized) to $2.73/Wp, and the capacity increased 18.5-fold (25% annualized) to 251 MW/yr. An experience curve analysis gives progress ratios of 87% and 81%, respectively, for U.S. silicon and thin-film module production.

Friedman, D. J.; Mitchell, R. L.; Keyes, B. M.; Bower, W. I.; King, R.; Mazer, J. A.

2006-01-01

383

PV Manufacturing R&D Project Status and Accomplishments under 'In-Line Diagnostics and Intelligent Processing' and 'Yield, Durability and Reliability': Preprint  

SciTech Connect

The PV Manufacturing R&D (PVMR&D) Project conducts cost-shared research and development programs with U.S. PV industry partners. There are currently two active industry partnership activities. ''In-line Diagnostics and Intelligent Processing'', launched in 2002, supports development of new in-line diagnostics and monitoring with real-time feedback for optimal process control and increased yield in the fabrication of PV modules, systems, and other system components. ''Yield, Durability and Reliability'', launched in late 2004, supports enhancement of PV module, system component, and complete system reliability in high-volume manufacturing. A second key undertaking of the PVMR&D Project is the collection and analysis of module production cost-capacity metrics for the U.S. PV industry. In the period from 1992 through 2005, the average module manufacturing cost in 2005 dollars fell 54% (5.7% annualized) to $2.74/Wp, and the capacity increased 18.6-fold (25% annualized) to 253 MW/yr. An experience curve analysis gives progress ratios of 87% and 81%, respectively, for U.S. silicon and thin-film module production.

Friedman, D. J.; Mitchell, R. L.; Keyes, B. M.; Bower, W. I.; King, R.; Mazer, J.

2006-05-01

384

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

385

Social Network Supported Process Recommender System  

PubMed Central

Process recommendation technologies have gained more and more attention in the field of intelligent business process modeling to assist the process modeling. However, most of the existing technologies only use the process structure analysis and do not take the social features of processes into account, while the process modeling is complex and comprehensive in most situations. This paper studies the feasibility of social network research technologies on process recommendation and builds a social network system of processes based on the features similarities. Then, three process matching degree measurements are presented and the system implementation is discussed subsequently. Finally, experimental evaluations and future works are introduced.

Ye, Yanming; Yin, Jianwei; Xu, Yueshen

2014-01-01

386

Social network supported process recommender system.  

PubMed

Process recommendation technologies have gained more and more attention in the field of intelligent business process modeling to assist the process modeling. However, most of the existing technologies only use the process structure analysis and do not take the social features of processes into account, while the process modeling is complex and comprehensive in most situations. This paper studies the feasibility of social network research technologies on process recommendation and builds a social network system of processes based on the features similarities. Then, three process matching degree measurements are presented and the system implementation is discussed subsequently. Finally, experimental evaluations and future works are introduced. PMID:24672309

Ye, Yanming; Yin, Jianwei; Xu, Yueshen

2014-01-01

387

Image storing system for radiation therapy (radiation oncology information system: ROIS) as a branch of diagnostic PACS; implementation and evaluation.  

PubMed

We have implemented the new system that is called as ROIS for storing medical images of the patients underwent radiotherapy as a branch of medium-scale diagnostic PACS. It was estimated that, for about nine years, we can store all medical images of the patients who received radiation therapy under the on-line storage condition. Further, we can retrieve all medical images of the radiotherapy patients on ROIS faster than conventional film library or on the diagnostic PACS, even if the patient had been treated many years ago. Implementation of ROIS provided us a great help in our clinical work. PMID:10227377

Yamada, T; Ikeda, M; Murao, T; Yanagawa, S; Ishigaki, T; Ishiguchi, T

1999-01-01

388

Comparison of measures to assess change in diagnostic performance due to a decision support system.  

PubMed Central

Little has been done to examine the relative merit of measures used to assess the impact of diagnostic decision support systems (DDSS) on physician performance. In this study, 10 different single-measures of diagnostic performance were compared empirically. The measures were of three types: rank-order, all-or-none, and appropriateness. The responsiveness (RESP) of each measure was estimated under two repeated-measures experimental conditions. RESP is the degree to which a measure could detect differences between conditions of low and high performance. The diagnostic performance of 108 physicians was compared on medical cases of varying diagnostic difficulty and with or without a high level of assistance from a DDSS. The results showed that the RESP among the measures varied nearly tenfold. The rank-order measures tended to provide the highest RESP values (maximum = 2.14) while appropriateness measures provided the lowest RESP values (maximum = 1.41). The most responsive measures were rank-orders of the correct diagnosis within the top 5 to 10 listed diagnoses.

Maisiak, R. S.; Berner, E. S.

2000-01-01

389

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

SciTech Connect

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 {approx}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. [Raja Ramanna Centre for Advanced Technology, Indore 452013 (India)

2011-02-15

390

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

391

Evaluation of the diagnostic value of a computed radiography system by comparison of digital hard copy images with screen-film mammography: results of a prospective clinical trial.  

PubMed

The purpose of the study was to determine prospectively the diagnostic value of a computed radiography (CR) system by comparing mammographic hard copy images with screen-film mammography (SFM). A series of 100 patients, who came for diagnostic investigation, underwent two-view SFM (Lorad M-IV Platinum) and digital mammography with a CR system (AGFA CR system). The images were obtained by double exposure, i.e. same view without removing compression of the corresponding breast. The CR images were processed with dedicated processing for mammography. Six radiologists read sets of SFM and CR images. The primary efficacy parameter was the overall diagnostic value. The secondary efficacy parameters were lesion conspicuity and lesion details (for masses and micro-calcifications), tissue visibility at chest wall and at skin line, axillary details, overall density and sharpness impression and the overall noise impression. These parameters were scored by a 7-point scoring system. "CR non-inferior to SFM" was concluded if the lower confidence interval bound exceeded 80%. The confidence interval for the overall diagnostic value was between 96.4% and 100%. Pooled analysis of the ten features for image quality comparison demonstrated for all but one feature (lesion details of the calcifications) CR non-inferiority to SFM. PMID:16518656

Van Ongeval, C; Bosmans, H; Van Steen, A; Joossens, K; Celis, V; Van Goethem, M; Verslegers, I; Nijs, K; Rogge, F; Marchal, G

2006-06-01

392

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

393

Glaucomics: a call for systems diagnostics for 21(st) century ophthalmology and personalized visual health.  

PubMed

This article analyzes and theorizes the current knowledge silos at the intersection of omics science, ophthalmology, personalized medicine, and global visual health. Visual disorders represent one of the largest health care expenditures in the United States, costing $139 billion per year. In middle-income and industrialized countries, glaucoma is a World Health Organization priority category eye disease, known for difficulties in its early diagnosis, chronic progressive nature, and large person-to-person differences in drug efficacy and safety. A complex disease, glaucoma is best conceptualized as a syndrome displaying an ostensibly common clinical end-point, but with vastly heterogeneous molecular underpinnings and host-environment interactions. About 12% of all global blindness is attributable to glaucoma. Glaucomics is a term that we coin here so as to introduce omics science and systems diagnostics to ophthalmology, a field that can benefit enormously from personalized medicine, and which has sadly lagged behind in systems diagnostics compared to fields such as oncology. We define glaucomics as the integrated use of multi-omics and systems science approaches towards rational discovery, development, and tandem applications of diagnostics and therapeutics, for glaucoma specifically, and for personalized visual health, more broadly. We propose that glaucoma is one of the neglected lowest hanging fruits and actionable targets for omics and systems diagnostics in 21(st) century ophthalmology for the salient reasons we describe here. Additionally, we offer an analysis on two of the most pertinent neglected tropical diseases (NTDs), trachoma and river blindness, which continue to plague visual health in developing countries. We conclude with a call for research on omics applications in glaucoma and personalized visual health. PMID:24730382

Güngör, K?vanç; Hotez, Peter J; Özdemir, Vural; Aynac?o?lu, ?ükrü

2014-05-01

394

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

395

A USN development strategy and demonstration results for propulsion and mechanical systems diagnostics, prognostics and health management  

Microsoft Academic Search

A US Navy strategy was generated and is still evolving to develop and demonstrate diagnostics and prognostics for helicopter drive trains. The SH-60 program was initiated as a proof-of-concept effort to develop, demonstrate, and integrate available and advanced mechanical diagnostic technologies for propulsion and power drive system monitoring. Included in these technologies were various rule based and model based analysis

William Hardman; Andrew Hess; David Blunt

2001-01-01

396

The diagnostics system for the multiple heavy ion beams induction linac experiment, MBE-4  

SciTech Connect

MBE-4 is a four beam current amplifying induction linac experiment conducted at LBL as a part of the Heavy Ion Fusion Accelerator Research (HIFAR) program for studying accelerator physics issues of a heavy ion driver for inertial fusion. The four ion beams (Cs{sup +}, 10 mA) are focused by electrostatic quadrupoles and accelerated fro about 200 keV to 900 keV through 24 induction gaps. Current amplification of up to nine times is achieved while the beam pulse duration is compressed from about 3 {mu}s to 0.5 {mu}s. The diagnostic system enables the complete time-resolved 2-D transverse phase space distribution of the beam to be measured. Reduction of the raw data yields the beam current, current profile, emittance, centroid position and angle as well as the beam envelope parameters. In addition, the longitudinal energy distribution is obtained from measurements using a calibrated electrostatic spectrometer. The diagnostic system hardware, as well as the data acquisition and reduction routines, are controlled by an IBM pc-XT. We shall describe the diagnostic system and discuss its performance in view of the specific issues which result from the acceleration and amplification of multiple beams of heavy ions.

Eylon, S.

1991-09-01

397

Pathohistological classification systems in gastric cancer: Diagnostic relevance and prognostic value  

PubMed Central

Several pathohistological classification systems exist for the diagnosis of gastric cancer. Many studies have investigated the correlation between the pathohistological characteristics in gastric cancer and patient characteristics, disease specific criteria and overall outcome. It is still controversial as to which classification system imparts the most reliable information, and therefore, the choice of system may vary in clinical routine. In addition to the most common classification systems, such as the Laurén and the World Health Organization (WHO) classifications, other authors have tried to characterize and classify gastric cancer based on the microscopic morphology and in reference to the clinical outcome of the patients. In more than 50 years of systematic classification of the pathohistological characteristics of gastric cancer, there is no sole classification system that is consistently used worldwide in diagnostics and research. However, several national guidelines for the treatment of gastric cancer refer to the Laurén or the WHO classifications regarding therapeutic decision-making, which underlines the importance of a reliable classification system for gastric cancer. The latest results from gastric cancer studies indicate that it might be useful to integrate DNA- and RNA-based features of gastric cancer into the classification systems to establish prognostic relevance. This article reviews the diagnostic relevance and the prognostic value of different pathohistological classification systems in gastric cancer.

Berlth, Felix; Bollschweiler, Elfriede; Drebber, Uta; Hoelscher, Arnulf H; Moenig, Stefan

2014-01-01

398

ACS Batch Processing System. Volume I. System Design Document.  

National Technical Information Service (NTIS)

The ACS Batch Processing System, System Design Document presents the results of the analysis of the batch processing programs which were extracted for use within the Batch Processing System (BPS) and a summary of the capabilities of the BPS system as it w...

F. C. Budelman G. J. Graklanoff P. R. Soderholm

1974-01-01

399

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

400

Upgrade to the control system of the reflectometry diagnostic of ASDEX upgrade  

SciTech Connect

The broadband frequency modulation-continuous wave microwave/millimeter wave reflectometer of ASDEX upgrade tokamak (Institut fuer Plasma Physik (IPP), Garching, Germany) developed by Centro de Fusao Nuclear (Lisboa, Portugal) with the collaboration of IPP, is a complex system with 13 channels (O and X modes) and two types of operation modes (swept and fixed frequency). The control system that ensures remote operation of the diagnostic incorporates VME and CAMAC bus based acquisition/timing systems. Microprocessor input/output boards are used to control and monitor the microwave circuitry and associated electronic devices. The implementation of the control system is based on an object-oriented client/server model: a centralized server manages the hardware and receives input from remote clients. Communication is handled through transmission control protocol/internet protocol sockets. Here we describe recent upgrades of the control system aiming to: (i) accommodate new channels; (ii) adapt to the heterogeneity of computing platforms and operating systems; and (iii) overcome remote access restrictions. Platform and operating system independence was achieved by redesigning the graphical user interface in JAVA. As secure shell is the standard remote access protocol adopted in major fusion laboratories, secure shell tunneling was implemented to allow remote operation of the diagnostic through the existing firewalls.

Graca, S.; Santos, J.; Manso, M.E. [Associacao EURATOM/IST, Centro de Fusao Nuclear, Instituto Superior Tecnico, 1049-001 Lisbon (Portugal)

2004-10-01

401

Lasa Experimental Signal Processing System.  

National Technical Information Service (NTIS)

The report discusses the effort expended to provide the hardware and software necessary to support research and development directed toward the study of seismic signal processing and delineates tasks planned for execution during the next quarter. In addit...

1967-01-01

402

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.

Maliborski, Artur; Rozycki, Radoslaw

2014-01-01

403

Artificial neural networks for processing fluorescence spectroscopy data in skin cancer diagnostics  

NASA Astrophysics Data System (ADS)

Over the years various optical spectroscopic techniques have been widely used as diagnostic tools in the discrimination of many types of malignant diseases. Recently, synchronous fluorescent spectroscopy (SFS) coupled with chemometrics has been applied in cancer diagnostics. The SFS method involves simultaneous scanning of both emission and excitation wavelengths while keeping the interval of wavelengths (constant-wavelength mode) or frequencies (constant-energy mode) between them constant. This method is fast, relatively inexpensive, sensitive and non-invasive. Total synchronous fluorescence spectra of normal skin, nevus and melanoma samples were used as input for training of artificial neural networks. Two different types of artificial neural networks were trained, the self-organizing map and the feed-forward neural network. Histopathology results of investigated skin samples were used as the gold standard for network output. Based on the obtained classification success rate of neural networks, we concluded that both networks provided high sensitivity with classification errors between 2 and 4%.

Lenhardt, L.; Zekovi?, I.; Drami?anin, T.; Drami?anin, M. D.

2013-11-01

404

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

405

Diagnostic Systems Plan for the Advanced Light Source Top-OffUpgrade  

SciTech Connect

The Advanced Light Source (ALS) will soon be upgraded to enable top-off operations [1], in which electrons are quasi-continuously injected to produce constant stored beam current. The upgrade is structured in two phases. First, we will upgrade our injector from 1.5 GeV to 1.9 GeV to allow full energy injection and will start top-off operations. In the second phase, we will upgrade the Booster Ring (BR) with a bunch cleaning system to allow high bunch purity top-off injection. A diagnostics upgrade will be crucial for success in both phases of the top-off project, and our plan for it is described in this paper. New booster ring diagnostics will include updated beam position monitor (BPM) electronics, a tune monitoring system, and a new scraper. Two new synchrotron light monitors and a beam stop will be added to the booster-to-storage ring transfer line (BTS), and all the existing beam current monitors along the accelerator chain will be integrated into a single injection efficiency monitoring application. A dedicated bunch purity monitor will be installed in the storage ring (SR). Together, these diagnostic upgrades will enable smooth commissioning of the full energy injector and a quick transition to high quality top-off operation at the ALS.

Barry, Walter; Chin, Mike; Robin, David; Sannibale, Fernando; Scarvie, Tom; Steier, Christoph

2005-05-10

406

Toward Evidence-based Decisions in Diagnostic Radiology: A Research and Rating Process for Multiple Decision-makers  

PubMed Central

The use of diagnostic imaging tests and the development of evidence-based guidelines, reviews, and other materials have both undergone substantial growth in recent years. However, the proliferation of evidence-based information has not translated into the universal deployment of medical and coverage policy for diagnostic imaging that is similarly evidence-based. One possible reason is the failure of those institutions generating evidence-based information to format findings in an accessible manner for all relevant stakeholders. The Institute for Clinical and Economic Review has developed a simple and transparent method for rating evidence that is accessible to clinicians, patients, payers, and other policy makers. The authors describe this process in relation to three imaging-based examples (computed tomographic colonography, coronary computed tomographic angiography, and positron emission tomography for dementia neuropathology). The issues raised, controversies considered, and use of the ratings in setting policy are discussed in relation to each example.

Ollendorf, Daniel A.; Craig Blackmore, C.; Lee, Janie M.

2013-01-01

407

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

408

Integrating system safety into the basic systems engineering process  

NASA Technical Reports Server (NTRS)

The basic elements of a systems engineering process are given along with a detailed description of what the safety system requires from the systems engineering process. Also discussed is the safety that the system provides to other subfunctions of systems engineering.

Griswold, J. W.

1971-01-01

409

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

410

Library Information-Processing System  

NASA Technical Reports Server (NTRS)

System works with Library of Congress MARC II format. System composed of subsystems that provide wide range of library informationprocessing capabilities. Format is American National Standards Institute (ANSI) format for machine-readable bibliographic data. Adaptable to any medium-to-large library.

1985-01-01

411

A radar data processing and enhancement system  

Microsoft Academic Search

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.

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

1986-01-01

412

Framework of computer integrated process systems  

Microsoft Academic Search

This paper attempts to illustrate the requirements and problem definitions of computer integrated processes systems (CIPS) for continuous manufacturing industries. An integrated distributed intelligent platform of software systems that supports the process design, operation, management and equipment maintenance is addressed. Its architecture, characteristics and functions are discussed. The structure and functions of the meta-system (which controls and manages the IDIP)

M. Raol; Q. Wang; L. Yuan; M. Zuo

1993-01-01

413

Integrated Trusted System Development Environment - Process.  

National Technical Information Service (NTIS)

The Integrated Trusted System Development Environment (ITSDE) Process project has further extended and refined the Integrated Development Process (IDP) defined previously by the authors. The result is a set of integrated Data Item Descriptions (DIDs) for ...

T. C. Benzel D. W. Rothnie S. D. Crocker

1993-01-01

414

Enhanced Sample Processing Devices, Systems and Methods.  

National Technical Information Service (NTIS)

Devices, systems, and methods for processing sample materials. The sample materials may be located in a plurality of process chambers in the device, which is rotated during heating of the sample materials.

B. W. Robole W. Bedingham

2005-01-01

415

The standards process: X3 information processing systems  

NASA Technical Reports Server (NTRS)

The topics are presented in viewgraph form and include the following: International Organization for Standards (ISO); International Electrotechnical Committee (IEC); ISO/IEC Joint Technical Committee 1 (JTC-1); U.S. interface to JTC-1; ANSI; national organizations; U.S. standards development processes; national and international standards developing organizations; regional organizations; and X3 information processing systems.

Emard, Jean-Paul

1993-01-01

416

Food frying process control system  

Microsoft Academic Search

Research conducted so far on the process of food frying has been primarily concerned with the physical and chemical changes occurring in fats under the influence of high temperature and prolonged heating. Physicochemical changes occurring in food due to the effect of heating were also measured. From the consumer point of view nutritive, taste and aesthetic values of food are

Ryszard Rywotycki

2003-01-01

417

Pax II Picture Processing System.  

National Technical Information Service (NTIS)

Over the past fifteen years, a body of techniques for processing pictorial information by computer has been developed. Many of these techniques involve operations which are 'uniform' in the sense that they do not depend on position within the picture. Ope...

J. W. Snively E. B. Butt

1968-01-01

418

Electron-optical recorder for pulse x-ray diagnostics of high-speed processes  

NASA Astrophysics Data System (ADS)

At research of high speed gas-dynamic processes x-ray image recording method is widely applied. The informativity of this method is defined by characteristics of the x-ray image formation system, which consists from x-ray or gamma- radiation source and a system of images recording. Application of developed in RFNC VNIIEF electron-optical recorders of the x-ray images has allowed to realize multi- frame recording of gas-dynamic processes and to expand methodical opportunities of x-ray imaging technique. The ways of technical realization of the high speed electron- optical recorders for single and multi-frame recorders for single and multi-frame recording are stated. Experimental results of check and the main characteristics of the electron-optical recorders are discussed. It is shown, that the sensitivity of such recorders can be changed in very wide range up to limiting, when each absorbed gamma-quantum is registered. At present in RFNC VNIIEF the electron- optical recorder `FIAR' is developed and widely applied. The result of four frames recording of plasma jet development on an output of plasma covering device also presented as an example of the recorder work. Prospects of development and perfection of characteristics of the electron-optical recorders and expansion of their application field are considered. An opportunity of creation of the x-ray image recorder with sensitive field above 4 square meters, enabling to receive the information on researched object in real time mode is shown. The design of such recorder permits fast adaptation for the requirements of gas-dynamic experiment.

Burtsev, Vasily V.; Elfimov, Sergey E.; Makarov, Yuri M.; Ryzhkov, Andrey V.

1997-05-01

419

Quality control assessment for the Medical Diagnostic Imaging Support (MDIS) System's display monitors  

NASA Astrophysics Data System (ADS)

By the middle of 1994, most of the radiology diagnoses at Madigan Army Medical Center will be performed on diagnostic workstations rather than from hardcopy films. Consistent, high- quality images must be produced by the different monitors to help support accurate diagnoses and consultation. We have applied several quality control tests to various types of monitors attached to a clinically-functioning medical diagnostic imaging support (MDIS or PACS) system at Madigan to ensure the high quality of diagnostic image display. Many characteristics of a monitor can degrade over time, including luminance, spatial uniformity, and spatial resolution. Tests to measure these characteristics are explained and results are shown. A photometer and the SMPTE test pattern are used in many of the tests. The results of different monitors on the same workstation are compared as well as the results from the same monitor over time. Technicians from the PACS vendor adjust the maximum brightness of the monitors periodically at Madigan so that they meet the specification. Our data shows that this adjustment alone is not sufficient to ensure that the other characteristics of a monitor are within acceptable values.

Parsons, David M.; Kim, Yongmin

1994-05-01

420

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

421

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

422

Spectroscopic and asteroseismic diagnostics on mixing processes inside red giant stars  

NASA Astrophysics Data System (ADS)

The availability of asteroseismic constraints for a large sample of stars from CoRoT and Kepler paves the way for various statistical studies of the seismic properties of stellar populations, and becomes a powerful tool to better understand stellar structure and evolution. I will present predictions of stellar models computed with the code STAREVOL including thermohaline mixing together with rotational mixing. I will briefly present a comparison between our theoretical predictions and spectroscopic observations, and discuss why asteroseismic diagnostics are relevant in this context.

Lagarde, N.

2013-11-01

423

Process for making a multilayer interconnect system  

NASA Technical Reports Server (NTRS)

A process for making an interconnect system for a multilayer circuit pattern. The interconnect system is formed having minimized through-hole space consumption so as to be suitable for high density, closely meshed circuit patterns.

Zachry, Clyde L. (Inventor); Niedzwiecke, Andrew J. (Inventor)

1976-01-01

424

Eos Image Data Processing System Definition Study.  

National Technical Information Service (NTIS)

The Image Processing System (IPS) requirements and configuration are defined for NASA-sponsored advanced technology Earth Observatory System (EOS). The scope included investigation and definition of IPS operational, functional, and product requirements co...

J. Gilbert T. Honikman E. Mcmahon E. Miller L. Pietrzak

1973-01-01

425

General Information Processing System: (GIPSY). Application Description.  

National Technical Information Service (NTIS)

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 area...

C. H. Addison

1969-01-01

426

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

427

Vibration mitigation in J-TEXT far-infrared diagnostic systems.  

PubMed

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° after optical optimization. PMID:23126974

Li, Q; Chen, J; Zhuang, G; Wang, Z J; Gao, L; Chen, W

2012-10-01

428

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

429

Vibration mitigation in J-TEXT far-infrared diagnostic systems  

NASA Astrophysics Data System (ADS)

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° after optical optimization.

Li, Q.; Chen, J.; Zhuang, G.; Wang, Z. J.; Gao, L.; Chen, W.

2012-10-01

430

Propellant injection systems and processes  

NASA Technical Reports Server (NTRS)

The previous 'Art of Injector Design' is maturing and merging with the more systematic 'Science of Combustion Device Analysis.' This technology can be based upon observation, correlation, experimentation and ultimately analytical modeling based upon basic engineering principles. This methodology is more systematic and far superior to the historical injector design process of 'Trial and Error' or blindly 'Copying Past Successes.' The benefit of such an approach is to be able to rank candidate design concepts for relative probability of success or technical risk in all the important combustion device design requirements and combustion process development risk categories before committing to an engine development program. Even if a single analytical design concept cannot be developed to predict satisfying all requirements simultaneously, a series of risk mitigation key enabling technologies can be identified for early resolution. Lower cost subscale or laboratory experimentation to demonstrate proof of principle, critical instrumentation requirements, and design discriminating test plans can be developed based on the physical insight provided by these analyses.

Ito, Jackson I.

1995-01-01

431

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

432

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

433

[The hand as an indicator for the diagnostic orientation in various systemic diseases involving the bones].  

PubMed

Radiological aspects of the hand are presented and discussed in connection with some of the more common systemic diseases involving the bones, in which the hand is an ideal diagnostic indicator. Suitable X-ray techniques and xeroradiography are used to identify alterations to the periostium, the bone cortex and marrow and the soft tissues. The different diseases were classified according to the part of the hand involved: a) distal extremities; b) proximal phalanges and metacarpals; c) entire hand; d) wrist area. PMID:6750446

Scutellari, P N; Orzincolo, C; Tamarozzi, R

1982-10-01

434

Observation of Marangoni flow in ordinary and self-rewetting fluids using optical diagnostic systems  

NASA Astrophysics Data System (ADS)

Dilute aqueous solutions of alcohols with a high number of carbon atoms can be considered as self-rewetting fluids due to their properties associated to an anomalous dependency of the surface tension with temperature in some ranges of concentrations. In this paper research activities focused on numerical simulations and laboratory experiments of the behaviour of a thin layer of liquid subject to a horizontal thermal gradient. The investigated liquids include ordinary liquids and water/alcohols mixtures. Physical properties measurements, in particular surface tension and refractive index, are also presented. Flow visualization and interferometric analysis have been carried out using optical diagnostic systems.

Cecere, A.; Paola, R. D.; Savino, R.; Abe, Y.; Carotenuto, L.; Vaerenbergh, S. V.

2011-02-01

435

Low-cost LANDSAT processing system  

NASA Technical Reports Server (NTRS)

LANDSAT analysis system is assembled from commercially available components at relatively low cost. Small-scale system is put together for price affordable for state agencies and universities. It processes LANDSAT data for subscene areas on repetitive basis. Amount of time required for processing decreases linearly with number of classifications desired. Computer programs written in FORTRAN IV are available for analyzing data.

Faust, N. L.; Hooper, N. J.; Spann, G. W.

1980-01-01

436

Control systems for the nanolithography process  

Microsoft Academic Search

The lithography process is the critical step in the fabrication of nanostructures for integrated circuit manufacturing. In this paper, a summary is presented of several projects applying control and signal processing techniques to lithography. We begin with a discussion of areas in the optical exposure process where systems techniques make a significant difference. These areas include the optical mask preparation

C. D. Schaper; K. El-Awady; A. Tay; T. Kailath

1999-01-01

437

Frameworks for Secured Business Process Management Systems  

Microsoft Academic Search

This paper formally defines a role-driven security and access control model of a business process in order eventually to provide a theoretical basis for realizing the secured business process management systems. That is, we propose a graphical representation and formal description of the mechanism that generates a set of role-driven security and access control models from a business process modeled

Haeng-kon Kim; Roger Y. Lee; Hae-Sool Yang

2006-01-01

438

The General Information Processing System (Gipsy).  

National Technical Information Service (NTIS)

The paper describes the General Information Processing System, a computer program designed to serve a variety of information processing applications. An input deck to the program is composed of a data base and a description of the processing tasks to be p...

J. D. Cooper

1969-01-01

439

Image processing technologies in intelligent transportation systems  

NASA Astrophysics Data System (ADS)

Nowadays in intelligent transportation systems (ITS), information gathering depends heavily on visual information. Image processing technologies (IPT) play a key role. After a brief introduction of ITS, IPT is illustrated from three aspects: image sensor, image processing methods and image processing system. Among many applications for image processing in ITS, the paper presents a roadside example, licence plate recognition (LPR). Attention is centered