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Multiagent fault‐diagnosis expert system in power systems

European Transactions on Electrical Power 1995年第5期5卷 341-347页

作者： Wang, J.P. Trécat, J. Dr. Jianping Wang is a doctor fellow in the Faculte Polytechnique de Mons in Belgium. His current research field is parallel processing applications in power systems. Dr. Wang obtained his BS degree from Southwest Jiaotong University in P.R. Chinain 1982. From 1982 to 1990 he was appointed as an assistant lecturer. lecturer and associate professor respectively in the electrical engineering department of Southwest Jiaotong University. He obtained his Ph.D in the FacultC Polytechnique de Mons in July of 1993. (BD Dolez 3 1 FPMS B-7000 Mons Belgium T +32-65/37 41 87 Fax +32-65/37 43 00) Professor J. Trécat is a director in the power system laboratory in the Faculty Polytechnique de Mons. He obtained his Ph.D in the University of Manchester Institute of Science and Technology(UM1ST) in U.K. in 1970. He has been working in the fields of power system automation artificial intelligence application and computer vision in the Facult6 Polytechnique de Mons since 1970. He is a senior member of IEEE and he has made much contribution both in electrical engineering education and research. (BD Dolez 3 I FPMS B-7000 Mons T +32-651374185. Fax +32-6513743 00)

In order to solve the speed problem and shallow reasoning problem met in current research in fault diagnosis expert system, this paper presents a model based parallel fault diagnosis expert system for energy management systems (EMS). The Petri net model, which corresponds to the relationship between power system components and their protection systems, has been used for the inference in fault diagnosis. A multiagent parallel processing expert system, which is based on five transputers in Sun workstation, has been built for fault diagnosis purposes. The test results show that this expert system is not only fast but also has better performances. Copyright © 1995 John Wiley & Sons, Ltd.

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AUTOMATED OPPOSING FORCES FOR TRAINING SIMULATIONS

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NAVAL ENGINEERS JOURNAL 1995年第3期107卷 245-252页

作者： ANTON, PS MCADOW, KL SMITH, DB LEHNER, PE SHARP, MA Dr. Philip S. Anton:is currently the Terhnology Area Manager of Modeling and Reasoning in the MITRE Advanced Information Technologies Center. His research at MITRE has included behavioral models of military doctrine and command environmental modeling and reasoning for command forces and intelligent simulations of military entities. His other interests include neural networks artificial intelligence and intelligent agents. Dr. Anton received a U.S. degree in Computer Engineering from UCLA and an M.S. degree and a Ph.D in Computational Neuroscience from the University of California. Irvine After finishing nuclear power training Mr. McAdow served as an Engineering Department Division Officer on USS Mariano G. Vallejo (SSBN 658). He then worked as a civilian far the Naval Coastal Systems Center and then far Martin Marietta Aero and Naval Systems in the development of various submarine systems and unmanned undersea vehicles. David Smith:has been a member of the technical staff at MITRE s Advanced Information Technologies center since 1993. He has a B.S. degree in Computer Science and Mathematics from Albright College and an M.S. degree in Information and Computer Science from the Georgia Institute of Technology. Dr. Paul Lehner:is a part-time Principal Scientist in the MITRE Advanced Information Technologies Center. In addition. Dr. Lehner is an Associate Professor of Systems Engineering at George Mason University. His research at MITRE has included automated planning and scheduling adversarial planning and reasoning against uncertainty. Dr. Lehner received a B.S. degree in Psychology from Bethany College. He also holds M.S. degrees in Psychology and Mathematics and a Ph.D. in Mathematical Psychology from the University of Michigan. Prior to his current employment at MITRE and at George Mason University Dr. Lehner served as the Technical Director of the Decision Sciences Section at PAR Government Systems Corporation. After finishing nuclear power training Cdr. Sharp served as an Engineering Department Divisi

Providing realistic opposing forces is critical to the successful use of military training simulations. Unfortunately, a number of issues can make the manual control of realistic opposing forces difficult or unattainable, This paper explores these issues while discussing how Automatic Interactive Targets (AITs) can assist Training Exercise Controllers (TECs) in providing validated and realistic opposing forces in highly interactive situations. The features of the prototype Remote AIT Processing System (RAPS) are used to demonstrate how an AIT system can be designed to meet TEC requirements for automated entities, RAPS can provide remote control of AITs for existing or new systems while providing sufficient features to allow a TEC to appropriately select and control AITs for individual training exercises and crew proficiencies.

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WAYS OF SEEING

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COMMUNICATIONS OF THE ACM 1994年第2期37卷 15-20页

作者： SOLOWAY, E Associate professor in the department of electrical engineering computer science at the University of Michigan

Technology drives major changes in science. Before the microscope came along, it was hard for scientists to even think about very small things; with the microscope scientists could finally see very small things and, in turn, think about a whole new class of ideas and questions. Technology has not driven major changes in education. In Intelligent Teaching Machines, Larry Cuban, former president of the American Education Research Association, the professional society for education researchers in North America, has documented the lack of impact of such heralded and truly wondrous technologies as the camera, the radio, and TV in the classroom. Microcomputer-based labs (MBL) is an emerging technology that provides learners with new ways of seeing-and thinking about scientific phenomena. In MBL, students connect up all sorts of probes-temperature, pH, motion-to a personal computer through a d/a converter. The data from a probe is pumped straight into a spreadsheet and graphically displayed on the screen in real-time. MBL technology is making a difference in education for the simple reason that it is being used to support an effective educational philosophy.

关键词： Educational technology Radio in education Television in education Teaching aids & devices computer assisted instruction Education -- United States

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Design of composite laminates by a genetic algorithm with memory

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Mechanics of Composite Materials and Structures 1994年第1期1卷 95-117页

作者： Kogiso, N. Watson, L.T. GÜrdal, Z. Haftka, R.T. Nagendra, S. Virginia Polytechnic Institute and State University Blacksburg VA 24061 United States Visiting Student Department of Aerospace Engineering Blacksburg VA 24061 United States Professor Departments of Computer Science and Mathematics Blacksburg VA 24061 United States Associate Professor Department of Engineering Science and Mechanics Blacksburg VA 24061 United States Christopher Kraft Professor of Aerospace and Ocean Engineering Blacksburg VA 24061 United States Research Associate Department of Engineering Science and Mechanics Blacksburg VA 24061 United States

This paper describes the use of a genetic algorithm with memory for the design of minimum thickness composite laminates subject to strength, buckling and ply contiguity constraints. A binary tree is used to efficiently store and retrieve information about past designs. This information is used to construct a set of linear approximations to the buckling load in the neighbourhood of each member of the population of designs. The approximations are then used to seek nearby improved designs in a procedure called local improvement. The paper demonstrates that this procedure substantially reduces the number of analyses required for the genetic search. The paper also demonstrates that the use of genetic algorithms helps find several alternative designs with similar performance, thus giving the designer a choice of alternatives. © 1994 Taylor and Francis Group, LLC.

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A measurement for the modal parameters of thermoplastic composites at different temperatures

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Advanced Composite Materials 1994年第4期3卷 255-268页

作者： Kueiming Soong[a] Ming-Yuan Yang[b] Wan-Cheng Hwang[c] Shyh-Rong Chen[d] [a] Associate Professor Dept. of Mechanical Engineering Chung-Cheng Institute of Technology Ta-Hsi Tao-Yuan Taiwan Republic of China [b] Graduate Student Graduate School of Science of National Defence Chung-Cheng Institute of Technology [c] Senior Researcher Chung-Shan Institute of Science and Technology Lung-Tan Tao-Yuan [d] Instructor Computer Center Chung-Cheng Institute of Technology

We investigate the validity of modal testing technique at high temperatures and also investigate the dynamic mechanical properties of thermoplastic laminated plates via modal parameters. The technique of one-way analysis of covariance is applied towards examining the resonant frequencies of stainless steel SUS 304 plate and the modal testing technique is shown to be stable and reliable in the oven. Additionally, the resonant frequency of each mode of AS4/APC-2 and AS4/PPS laminated plates increases linearly with increase in chamber temperature below the glass transition temperature. The small change of the resonant frequencies indicates that the stiffness of the specimen is slightly influenced by the temperature.

关键词： composite materials modal analysis statistic analysis temperature effect

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NUMERICAL-METHOD FOR CALCULATING SURFACE CURRENT-DENSITY ON 3-DIMENSIONAL SMOOTH SCATTERERS

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1994年第2期77卷 1-11页

作者： IKUNO, H GONDO, M NISHIMOTO, M Faculty of Engineering Kumamoto University Kumamoto Japan 860 Himyoshi Ikmo received his B.E. M.E. and Ph.D. from Kyushu University in 1962 1964 and 1979 respectively. From 1967 to 1970 he was a Research Associate in Computer Science and Communication Engineering at Kyushu University. He joined the Department of Electrical Engineering and Computer Science of Kumamoto University in 1970 and is currently a Professor there. During 1983 to 1984 he was a Visiting Professor at the Polytechnic University Brooklyn NY. His research interests are in the areas of scattering diffraction and wave propagation in the theory of electromagnetics. Dr. Ikuno is a member of IEEE and IEE of Japan. Michim Gondo graduated from National Defense Academy Yokosuka in 1985 and received his M.E. from Kumamoto University in 1990. He is currently in the doctoral program at Kumamoto University. His research interest is in three-dimensional electromagnetic scattering. Masahiko Nkhimoto received his B.S. in Electronic Engineering from Kumamoto University in 1982 and an M.S. and Ph.D. from Kyushu University in 1984 and 1987 respectively. Since 1987 he has been a Research Associate in the Department of Electrical Engineering and Computer Science Kurnamoto University. His research interests are in the areas of scattering and diffraction of electromagnetic waves.

This paper shows that the surface current density can be calculated by using approximate total tangent magnetic vector fields which are expressed by finite number of linear combination of tangent vectors of spherical wave functions. Sampling points are determined by considering the property of associated Legendre functions and trigonometrical functions. By setting a number of sampling points to twice the largest mode number, a computer-aided algorithm is obtained. The accuracy of the solutions is checked and the polarization dependence of the surface current densities is clarified.

关键词： YASUURA METHOD 3-DIMENSIONAL PROBLEM BODY OF REVOLUTION LEAST-SQUARES PROBLEM

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3-D EDGE ELEMENT ANALYSIS OF DIELECTRIC-LOADED RESONANT CAVITIES

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1994年第1期7卷 35-41页

作者： ZHU, ZL DAVIES, JB FERNANDEZ, FA Department of Electronic and Electrical Engineering University College London WC1E 7JE U.K. On leave from the Department of Radio Electronics Peking University Beijing 100871 People's Republic of China. Le-zhu Zhou was born in Guizhou China in 1944. He received the B.S. degree in Physics and M.S. degree in Electronics from Peking University Beijing China in 1968 and 1981 respectively. Since 1981 he has been on the staff of the Department of Radio-Electronics of Peking University. In 1983 he was appointed as a Lecturer. In 1989 he became an Associate Professor. Since September 1991 he has been doing research as an Academic Visitor at the Department of Electronic and Electrical Engineering of University College London. He has been engaged in the electromagnetic field theory and its application. Recently his research interest has been in the computer modelling of optical and microwave structures by using edge element methods. J. Brian Davies was born in Liverpool England in 1932. He received the B.A. degree in mathematics in 1955 from Jesus College Cambridge England. He received the M.Sc. degree in mathematics the Ph.D. degree in mathematical physics and the D.Sc. (Eng) degree in engineering in 1957 1960 and 1980 respectively from the University of London England. From 1955 to 1963 he worked at the Mullard Research Laboratories Salford Surrey England except for two years spent at University College London. In 1963 he joined the academic staff of the Department of Electrical Engineering University of Sheffield England. Since 1967 he has been on the staff at University College London where he is now Professor of Electrical Engineering. From 1971 to 1972 he was Visiting Scientist at the National Bureau of Standards Boulder CO. In 1983 he was a Visitor at the Department of Engineering Science University of Oxford England. From 1988 to 1989 he was a Visiting Professor at the University of Colorado Boulder CO. His research interests have included microwave and optical aspects of electr

The eigenmodes in electromagnetic cavities, loaded with arbitrarily shaped dielectric materials, are computed by the edge element method. The computation shows that the well known 'spurious modes' no longer appear. Formulae are given and verified so that the number of zero eigenvalues, which come from del x H = 0, may be accurately predicted. Formulae for the order and density of the global matrices are given for a rectangular cavity regularly divided into bricks and tetrahedra, allowing an associated comparison between the contrasting edge and nodal element formulations. Comparison of the computed results with available theoretical and previously published data show the edge element approach to be a robust, accurate and effective method.

关键词： Dielectric waveguides

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PERFORMANCE OF A PRIORITIZED ON-BOARD BASEBAND SWITCH FOR A MULTISERVICE MULTIBEAM SATELLITE

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 283-297页

作者： BOHM, S ELHAKEEM, AK HACHICHA, M Department of Electrical and Computer Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal H3A 1M8 Canada Was born in Montreal Canada on 14 September 1966. He received the B. Eng. degree in electrical engineering from Concordia University Montreal Canada in 1989. He is at present completing the M.A.Sc. degree in electrical engineering at Concordia University. (S'75–S'79–M'79–SM'86) received the Ph.D. degree from Southern Methodist University Dallas TX in 1979. He spent the next two years working as a Visiting Professor in Egypt after which he moved to Ottawa Canada in 1982. He assumed teaching and research positions in Carleton and Manitoba Univerities and later moved to Concordia University Montreal Canada in 1983 where he is now a Professor in the Electrical and Computer Engineering Department. He has published numerous papers in IEEE and international journals in the areas of spread spectrum and networking. He is a well-known expert in these areas and serves as a consultant to many companies. His current research interests include wide-band metropolitan networks switching architectures and performance of on-board multibeam satellites acquisitionless CDMA networks code distribution and orthogonalization of CDMA signals responsive congestion control for ATM-based networks ARQ techniques and investigation of the novel SUGAR CDMA systems in fading channels. Dr. Elhakeem is a Senior Member of the Canadian Electrical Engineering Society and Armed Forces Association. He has chaired numerous technical sessions in IEEE Conferences was the Technical Program Chairman for IEEE Montech 1986 Montreal Canada. Dr. Elhakeem is the key guest editor of theIEEE Journal of Selected Areas in Communicationsfor the May June issues 1993 covering CDMA networks. Advanced Technology & Networks VISTAR Telecommunications Inc. Ottawa Ontario K1G 3J4 Canada An Associate Director of Advanced Technology & Networks Group VISTAR Telecommunications Inc. Ottawa Canada. He is also an Adjunct Pr

In this paper, we study the performance of a prioritized on-board baseband switch in conjunction with a multibeam satellite handling integrated services. The services considered for the analysis include voice, video, file transfer and interactive data. The prioritized switch uses both input and output buffering, switch speed-up as well as a two-phase head-of-line resolution algorithm, in order to reduce the buffer loss while maintaining acceptable user delays. The minimum required buffer capacity and switch speed-up for each service in a prioritized environment are found under uniform traffic conditions. It is shown that under uniform traffic conditions, only minimal buffering and switch speed-up are needed even for the lowest priority users. The performance dependence on the switch size is also substantially reduced with head of line resolution and buffering even in a prioritized environment.

关键词： SWITCH ON-BOARD BASEBAND MULTIBEAM PRIORITIZED HEAD-OF-LINE UNIFORM LOAD SPEED-UP

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What does computation have to do with 'real' physics?

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computers in Physics 1993年第5期7卷 485-485页

作者： Giles, Roscoe an associate professor in the Electrical Computer and Systems Engineering Department and a member of the Physics Department at Boston University (Boston MA). He also serves as deputy director of the Center for Computational Science at Boston University.

Roscoe Giles; What does computation have to do with “real” physics?, computer in Physics, Volume 7, Issue 5, 1 September 1993, Pages 485, https://***/10.106

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Steady‐state modelling of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive

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European Transactions on Electrical Power 1993年第5期3卷 379-386页

作者： Hamed, S.A. Dr. Sadeq A. Hamed (1957) received his B.Sc. degree in Electrical Power Engineering from Damascus University Syria in 1980. From 1980 to 1982 he has been with the Department of Electrical Engineering at the University of Jordan Ammad/Jordan. He obtained the M.Sc. degree in Power Electronics and Systems and the PhD degree in Power Electronics from the University of Manchester Institute of Science and Technology (UMIST) Manchester/GB in 1983 and 1986 respectively. In 1986 he joined the Department of Electrical Engineering. Jordan University as an Assistant Professor. In 1991 became an Associate Professor at the same department. His research activities include modelling and simulation of AC/DC drive systems pulse-width modulation control of motor implementation of computer-controlled drive systems energy saving in the electrical drive industry. (Jordan University Department of Electrical Engineering Amman/Jordan T + 96 26/843555 - 28 13 Fax + 9626/8485 58)

With the increasing availability of power transistor switches, PWM controlled rectifiers can efficiently and economically be employed in low and medium power applications of DC drive systems. In this paper, steady‐state modelling and solution of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive is accomplished. The developed model is presented in a generalized form that is applicable irrespective of the number of pulses per supply half‐cycle. Measured and predicted parameters are shown to be very close and the model is proved to be efficient and accurate. Both continuous and discontinuous modes of operation are covered, and critical operating conditions at which the system moves from one mode to the other are thoroughly investigated. The effects of the armature inductance‐to‐resistance ratio and the chopping frequency on these critical conditions, load and line harmonics, and on the ripple contents of the armature current are also thoroughly investigated. Copyright © 1993 John Wiley & Sons, Ltd.

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