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Pulse method measurements for determination of line fault location

Archives of electrical engineering 2006年第217-218期55卷 301-312页

作者： Tarczyński, WiesLaw Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

This article presents an analysis of how pulses in the long two-conductor coupled lines with conductor screened interact mutually. The interaction of pulses appears in those places of the line, where there is a change of wave impedance causing a change in reflection coefficient for pulses moving along the line. An exemplary analysis is performed for a homogenous lossless line at its starting and terminal points. The results of analysis are analytical expressions describing quantitative interactions of pulses. The expressions are verified both by computer simulation and by measurements of the real line. There has been performed the analysis of influence of the resistances with which the terminal points of the line are loaded onto the amplitude value of the pulses registered at the starting point of the line. The new method and the new system of measurements of pulses have been proposed that minimize the interaction of pulses at the starting point of the line, disadvantageous for the process of fault location by using pulse method.

关键词： Electric fault currents

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Determination of regulation characteristics of switched reluctance motors for quasi-optimal operation

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Archives of electrical engineering 2006年第217-218期55卷 313-324页

作者： Tomczewski, Krzysztof Wach, Piotr Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

The paper presents regulation characteristics that fulfill the requirements of highest possible efficiency and strongly reduced torque ripple level. For switched reluctance motors it is not so simple and obvious, because the regulation characteristics depend on three variables: phase voltage, switch-on and switch-off angles. For this reason in a steady state the same operation point (Tl, ω) of the mechanical characteristic is attainable for quite different values of those control parameters. So there is a field for quasi-optimal operation and the choice of the coresponding control parameters is the main subject of this work. The paper presents also the method to determine these quasi-optimal control characteristics from simple tests or from computations based on presented simple mathematical model.

关键词： Reluctance motors

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Workshop on imaging science development for cancer prevention and preemption

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Cancer Biomarkers 2007年第1期3卷 1-33页

作者： Kelloff, Gary J. Sullivan, Daniel C. Baker, Houston Clarke, Lawrence P. Nordstrom, Robert Tatum, James L. Dorfman, Gary S. Jacobs, Paula Berg, Christine D. Pomper, Martin G. Birrer, Michael J. Tempero, Margaret Higley, Howard R. Petty, Brenda Gumbs Sigman, Caroline C. Maley, Carlo Sharma, Prateek Wax, Adam Ginsberg, Gregory G. Dannenberg, Andrew J. Hawk, Ernest T. Messing, Edward M. Grossman, H. Barton Harisinghani, Mukesh Bigio, Irving J. Griebel, Donna Henson, Donald E. Fabian, Carol J. Ferrara, Katherine Fantini, Sergio Schnall, Mitchell D. Zujewski, Jo Anne Hayes, Wendy Klein, Eric A. DeMarzo, Angelo Ocak, Iclal Ketterling, Jeffrey A. Tempany, Clare Shtern, Faina Parnes, Howard L. Gomez, Jorge Srivastava, Sudhir Szabo, Eva Lam, Stephen Seibel, Eric J. Massion, Pierre McLennan, Geoffrey Cleary, Kevin Suh, Robert Burt, Randall W. Pfeiffer, Ruth M. Hoffman, John M. Roy, Hemant K. Wang, Thomas Limburg, Paul J. El-Deiry, Wafik S. Papadimitrakopoulou, Vali Hittelman, Walter N. MacAulay, Calum Veltri, Robert W. Solomonzz, Diane Jeronimo, Jose Richards-Kortum, Rebecca Johnson, Karen A. Viner, Jaye L. Stratton, Steven P. Rajadhyaksha, Milind Dhawan, Atam NIH/NCI/DCTD Cancer Imaging Program Bethesda MD United States NIH/NCI/DCTD Cancer Imaging Program NCI-Frederick Frederick MD United States NIH/NCI/DCP Early Detection Research Group Bethesda MD United States The Johns Hopkins University School of Medicine Departments of Radiology Pharmacology and Oncology Division of Neuroradiology Baltimore MD United States NIH/NCI/CCR Cell and Cancer Biology Branch Bethesda MD United States University of California San Francisco Department of Medicine Division of Medical Oncology San Francisco CA United States CCS Associates Inc. Mountain View CA United States Wistar Institute Molecular and Cellular Oncogenesis Program Philadelphia PA United States University of Kansas School of Medicine VA Hospital Kansas City MO United States Duke University Department of Biomedical Engineering Medical Physics Program Durham NC United States University of Pennsylvania School of Medicine Department of Gastroenterology Philadelphia PA United States New York Presbyterian Hospital Weill Medical College of Cornell University New York NY United States NIH/NCI/OD Office of Centers for Training and Resources Bethesda MD United States University of Rochester Medical Center Department of Urology Rochester NY United States University of Texas MD Anderson Cancer Center Department of Urology Houston TX United States Massachusetts General Hospital Abdominal Imaging/Interventional Radiology Boston MA United States Boston University Biomedical Engineering Electrical and Computer Engineering and Physics Boston MA United States NIH/NCI/DCP Gastrointestinal and Other Cancers Research Group Bethesda MD United States The George Washington University Cancer Institute Office of Cancer Prevention and Control Washington DC United States University of Kansas Cancer Center Clinical Oncology Kansas City KS United States University of California Davis Department of Biomedical Engineering Davis CA United States Tufts University De

The concept of intraepithelial neoplasm (IEN) as a near-obligate precursor of cancers has generated opportunities to examine drug or device intervention strategies that may reverse or retard the sometimes lengthy process of carcinogenesis. Chemopreventive agents with high therapeutic indices, well-monitored for efficacy and safety, are greatly needed, as is development of less invasive or minimally disruptive visualization and assessment methods to safely screen nominally healthy but at-risk patients, often for extended periods of time and at repeated intervals. Imaging devices, alone or in combination with anticancer drugs, may also provide novel interventions to treat or prevent precancer.

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Velocity control of electric propulsion space vehicles using heliocentric gravitational sling

Velocity control of electric propulsion space vehicles using...

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2006 World Automation Congress, WAC'06

作者： Reddy, Bandi Bharat Kumar Homaifar, Abdullah Esterline, Albert C. Autonomous Control and Information Technology Center Department of Electrical and Computer Engineering North Carolina A and T State University United States

ISBN: (纸本)1889335339

The objective of this research is to determine a near optimal fuel efficient control strategy for an electric propulsion space vehicle to attain a predefined velocity at the target. The control strategy is represented as a chromosome and micro genetic algorithms are used to find the best solution. The control strategy uses me space vehicle's reverse thrust and the sling effect caused by the Sun. Copyright - World Automation Congress (WAC) 2006.

关键词： Aerospace vehicles

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Linear time-varying filter with variable bandwidth

Linear time-varying filter with variable bandwidth

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ISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems

作者： Heyoung, Lee Zeungnam, Bien Department of Control and Instrumentation Engineering Seoul National University of Technology Seoul Korea Republic of Department of Electrical and Computer Science KAIST Daejon Korea Republic of

ISBN: (纸本)0780393902

A linear time-varying filter with the characteristic of variable bandwidth is proposed for noise reduction of signals with time-varying bandwidth and decomposition of multicomponent signals into components. The proposed filters are composed of constant coefficients and differential operators with a time-varying coefficient. Frequency analysis of the proposed filter is given. Also, the compensation of time-varying delay due to linear phase is discussed. ©2006 IEEE.

关键词： Wave filters

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On the Impact of Plant Model and controller Sophistication on Performance of Disturbance Attenuation and System Robustness

On the Impact of Plant Model and Controller Sophistication o...

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IEEE Conference on Decision and control

作者： M. J. Blachuta G. Bialic Department of Automatic Control Silesian Technical University Gliwice Poland Department of Electrical Engineering Automatic Control and Computer Science Technical University of Opole Opole Poland

ISBN: (纸本)1424401704;9781424401703

In the paper the problem of disturbance attenuation performance in single-loop control system is investigated. Modified MV control strategy with bounded control variance is used as benchmark for both LQG and classically and optimally tuned PID-type controllers. Certain time and frequency domain functions are then examined to further assess the control performance in terms of robustness. It has been shown that as long as the system to be controlled is delay-free, and there is no extreme demand on performance, simple lag-delay system model along with optimally tuned PID control algorithm provides control quality similar to that of LQG controlled original system assuming the same bound on control signal variance. Although the classical performance measure based on substitute delay indicates then almost optimal performance, there is still room for additional improvement that can be attained using both PID and LQG controllers and more sophisticated original delay-free model. The price paid is much larger control variance. It is interesting to note that while LQG systems remain robust this is not longer valid for PID controllers

关键词： Attenuation Robust control Optimal control Delay Three-term control control systems Automatic control control system synthesis Performance analysis USA Councils

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Hybrid geometrie reduction of hybrid systems

Hybrid geometrie reduction of hybrid systems

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45th IEEE Conference on Decision and control 2006, CDC

作者： Ames, Aaron D. Sastry, Shankar Control and Dynamical Systems Department California Institute of Technology Pasadena CA 91125 United States Department of Electrical Engineering and Computer Sciences University of California at Berkeley Berkeley CA 94709 United States

ISBN: (纸本)1424401712

关键词： Computational geometry

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The study of ZnO photoconductive UV detector

The study of ZnO photoconductive UV detector

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ICSICT-2006: 2006 8th International Conference on Solid-State and Integrated Circuit technology

作者： Li, Ying Feng, Shi-Wei Sun, Jing-Ying Xie, Xue-Song Yang, Ji Zhang, Yue-Zong Lu, Yi-Cheng School of Electronic Information and Control Engineering Beijing University of Technology Beijing 100022 China Department of Computer and Electrical Eng. Rutgers University 94 Brett Road Piscataway NJ 08854 United States

ISBN: (纸本)1424401615

A ZnO photoconductive UV detector was fabricated on ZnO film grown by MOCVD based on Al/Au interdigital electrode. Nonalloyed Al/Au metallization scheme formed good ohmic contact on n-type ZnO. The dark and photoilluminated currents increased linearly with bias voltage. The cutoff wavelength of the detector was 368nm, and it was also in response to the blue and green light. electrical and photoresponsive changes of the ZnO UV detector due to RF sputter deposition of Antireflection coating (AR) were also studied. © 2006 IEEE.

关键词： Ultraviolet detectors

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Efficient computation of orthogonal moments by suppressing the factorial terms

Efficient computation of orthogonal moments by suppressing t...

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IST 2006 - 2006 IEEE International Workshop on Imagining Systems and Techniques

作者： Papakostas, G.A. Boutalis, Y.S. Karras, D.A. Mertzios, B.G. Democritus University of Thrace Department of Electrical and Computer Engineering 67100 Xanthi Hellas Chalkis Institute of Technology Automation Department Chalkida Hellas Thessaloniki Institute of Technology Department of Automation Laboratory of Control Sys. and Comp. Intell. Thessaloniki Hellas

ISBN: (纸本)1424402514

A Modified Direct Method for the computation of the Zernike moments is presented in this paper. The presence of many factorial terms, in the direct method for computing the Zernike moments, makes their computation process a very time consuming task. Although the computational power of the modern computers is impressively increasing, the calculation of the factorial of a big number is still an inaccurate numerical procedure. The main concept of the present paper is that, by using Stirling's Approximation formula for the factorial and by applying some suitable mathematical properties, a novel, factorial-free direct method can be developed. The resulted moments are not equal to those computed by the original direct method, but they are a sufficiently accurate approximation of them. The proposed methodology is generic and can be successfully applied to any orthogonal moments having kernel moment functions consisted of factorial terms. ©2006 IEEE.

关键词： Image analysis

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A HVS-directed neural-network-based approach for salt-pepper impulse noise removal

A HVS-directed neural-network-based approach for salt-pepper...

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作者： Lu, Shih-Mao Liang, Sheng-Fu Lin, Chin-Teng Department of Electrical and Control Engineering National Chiao Tung University Hsinchu 300 Taiwan Department of Computer Science National Chiao Tung University Hsinchu 300 Taiwan Department of Biological Science and Technology National Chiao Tung University Hsinchu 300 Taiwan

In this paper, a novel two-stage noise removal algorithm to deal with salt-pepper impulse noise is proposed. In the first stage, the decision-based recursive adaptive noise-exclusive median filter is applied to remove the noise cleanly and to keep the uncorrupted information as well as possible. In the second stage, the fuzzy decision rules inspired by human visual system (HVS) are proposed to classify image pixels into human perception sensitive class and non-sensitive class. A neural network is proposed to compensate the sensitive regions for image quality enhancement. According to the experimental results, the proposed method is superior to conventional methods in perceptual image quality as well as the clarity and the smoothness in edge regions of the resultant images.

关键词： Impulse noise

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