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PARALLEL AND DISTRIBUTED TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELD MODELING

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.

关键词： Mathematical models

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ISDN LOOP EXTENSION USING A MID-SPAN AMPLIFIER

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1995年第3期8卷 219-224页

作者： ERKER, GJ DODDS, DE KRZYMIEN, WA David E. Dodds was born in Saskatoon Canada in 1945. He received the B. Eng. and MSc. degrees from the University of Saskatchewan in 1966 and 1968 respectively. He worked with Bell Northern Research (Ottawa) on PBX design in 1969 1972 and 1978. Since 1969 he has been with the University of Saskatchewan where he is currently Professor of Electrical Engineering. He teaches courses in electronics and communications and also presents short courses on the fundamentals of telephony. Current research interests are in data transmission signal processing architecture and frame synchronization for PCM and spread spectrum systems. He has been granted five patents relating to commercial products in delta-modulation telephone line interfacing and computer data transmission. In 1986 he was on sabbatical leave at BNR Inc. and worked with an ANSI committee on the standardization of FDDI-II a combined voice and data system. Mr. Dodds is a Registered Consulting Engineer in Saskatchewan. Witold A. Krzyden received his MSc. (Eng.) and Ph.D. degrees (both in Electrical Engineering) in 1970 and 1978 respectively from the Poznan Technical University in Poznan Poland. He was awarded the Minister's of Science and Technology Prize of Excellence for his Ph.D. thesis. From 1970 to 1978 he was a Research Engineer and Teaching Assistant and then from 1978 to 1980 an Assistant Professor of Electrical Engineering at the Poznan Technical University. In 1980 he won a Dutch Government Research Fellowship at the Twente University of Technology in Enschede the Netherlands for the year of 1980/1981. In the following year of 1981/82 he was a Research Assistant Professor there. From 1982 to 1986 he was an Assistant Professor of Electrical Engineering at Lakehead University in Thunder Bay Ontario Canada. In 1986 he joined the Univeristy of Alberta and Alberta Telecommunications Research Centre (now Telecommunications Research Laboratories or TRLabs) as an Associate Professor of Electrical Engineering. Currently he is a Professor of E

The 5.5 km range of the basic rate ISDN loop has been extended by using a negative impedance amplifier and by using a 2 wire/4 wire (2w/4w) amplifier. The negative impedance amplifier extends the range of the loop by 1.0 km, whereas the 2w/4w amplifier extends the range by 1.5 km at the expense of increased complexity. As part of the amplifer design, a resistor/capacitor network has been developed which closely matches the characteristic impedance of telephone cable. Error rate tests have been conducted using various lengths of cable and an operating ISDN line.

关键词： ISDN PHYSICAL LAYER BASIC RATE LOOP RANGE EXTENSION

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A study on degradation of spatial resolution in frequency-modulated continuous wave reflectometry due to nonlinear optical frequency sweep

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1995年第10期78卷 28-35页

作者： Wang, LT Iiyama, K Hayashi, K Faculty of Technology Kanazawa University Kanazawa Japan 920 Koichi liyama:received his B.E. M.E. and Dr. of Eng. degrees in Electronic Engineering all from Kanazawa University Kanazawa Japan in 1985 1987 and 1993 respectively. From 1987 to 1988 he worked at Yokogawa Hewlett-Packard Ltd. Since 1988 he has been working as a Research Associate in the Department of Electrical and Computer Engineering Kanazawa University and is now a Lecturer. His current research interest is fiber-optic sensors optical fiber science including Er-doped fibers optical waveguides and the optical reflectometry. Dr. liyama is a member of the IEEE and the Japan Society of Applied Physics. Members Ken-ichi Hayashi:received his B.E. degree in Electronic Engineering from Kanazawa University Kanazawa Japan in 1966 and his Dr. of Eng. degree from Nagoya University Nagoya Japan in 1977. Since 1966 he has been with the Department of Electronics Kanazawa University where he is now a Professor in the Department of Electrical and Computer Engineering. He is currently engaged in research on applications of Er-doped optical fibers fiber-optic sensors optical waveguides and optical reflectometry. Dr. Hayashi is a member of the SICE and the IEEE.

The degradation of the spatial resolution in frequency-modulated continuous wave (FMCW) reflectometry due to the nonlinearity in the optical frequency sweep are discussed both experimentally and theoretically. The response lag in the optical frequency change of a laser diode behind the injection current change was experimentally measured, showing that there were several time constants in the optical frequency response. The interference signals in the FMCW reflectometry were theoretically calculated by taking account of the response lag. From these calculations, the beat frequency becomes low just after the turning point of the optical frequency sweep;this is due to the response lag in the optical frequency response. As a result, the spectrum of the interference signal is spread out toward the low frequency region and spatial resolution is degraded. Moreover, the spatial resolution is seriously degraded with increasing the diagnosing distance due to the nonlinearity in the optical frequency sweep. The calculated results agree well with the measured results.

关键词： laser diode optical frequency sweep modulation reflectometry

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Multiagent fault‐diagnosis expert system in power systems

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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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There's more to OOP than syntax! 94

There's more to OOP than syntax!

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Proceedings of the twenty-fifth SIGCSE symposium on computer science education

作者： Paul A. Luker O'Connell Professor of Technology Department of Computer Science and Engineering California State University Chico Chico CA

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Automating interface evaluation 94

Automating interface evaluation

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Conference Companion on Human Factors in Computing Systems

作者： Michael D. Byrne D. Wood Piyawadee Sukaviriya James D. Foley David Kieras Graphics Visualization and Usabitity Center Georgia Institute of Technology Atlanta GA Electrical Engineering and Computer Science Department University of Michigan Ann Arbor MI

No abstract available.

ISBN: (纸本)9780897916516

No abstract available.

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TECHNOLOGICAL SUBSTITUTION AND THE DEATH OF AN INDUSTRY

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technology IN SOCIETY 1994年第1期16卷 85-95页

作者： ROSENBAUM, J [&lowast ]Jan Rosenbaum has worked in the imaging industry for 30 years first as a newspaper photographer and assistant professor of photography then as a camera designer and image quality specialist in the medical and computer graphics industries. He holds a B.F.A. in art from Wayne State University an M.F.A. in photography from Cranbrook Academy of Art an M.S. in imaging and photographic science from Rochester Institute of Technology and an M.S. in management of technology from Polytechnic University of New York. Until recently he was head of the optical and color science group at a division of Agfa-Gevaert.

The medical imaging industry offers an example of what can happen when an industry ignores threats from new technologies and fails to respond to a change in the paradigm upon which it is based. The lessons learned from these basic errors in management may help those in other industries that operate at technology's edge to avoid obsolescence. The company discussed is, or was, real. As of summer, 1993, the last remaining vestige of the company was sold off to a small group of employees and their backers. The number of employees, once 900, is now fewer than 100. Most of them are looking for a way to stay in business.

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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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Product disposal and re-use issues for portable computer design

Product disposal and re-use issues for portable computer des...

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IEEE International Symposium on Electronics and the Environment

作者： C. Hendrickson L. Lave F. McMichael D. Siewiorek A. Smailagic Tse-Sung Wu Assoc. Dean Camegie Institute of Technology Department of Civil Engineering Camegie Mellon University Pittsburgh PA USA Higgins Professor of Economics and University Professor Camegie Mellon University Pittsburgh PA USA Walter Blenko Sr. Professor of Environmental Engineering Camegie Mellon University Pittsburgh PA USA Computer Science and Electrical and Computer Engineering Camegie Mellon University Pittsburgh PA USA Visiting Research Scientist Engineering Design Research Center Camegie Mellon University Pittsburgh PA USA Research Assistant. Engineering Design Research Center Camegie Mellon University Pittsburgh PA USA

Portable computers including laptops, notebooks, sub-notebooks and portable digital assistants are a rapidly growing segment of the computer market. Manufacturers of portable computers have an opportunity to win public praise and to avoid censure and liability by embracing green design and sensible product disposal systems. This paper analyzes the environmental issues associated with disposal, re-use and recycling of these machines, focusing on potential design changes to alleviate environmental burdens. Portable computers can replace larger machines, resulting in lower energy use and lower overall material demand. Since the number of portable computers purchased may be as many as 100 million over the next decade, environmental concerns become increasingly important. Portable computers use batteries with toxic components, so there are disposal or recycling problems. Another significant issue in assessment of disposal and recycling processes is the expected life time of portable computers. Machine design with capability for easy upgrade can be expected to have a longer useful life. The paper uses experience gained in several generations of wearable computer designs at Carnegie Mellon University for illustration.< >

关键词： Portable computers Marketing and sales Wearable computers computer aided manufacturing Recycling Batteries Telecommunication computing Vehicles Embedded computing Economic forecasting

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