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Control of PWM AC‐to‐DC converters using state‐space and fuzzy‐methods

European Transactions on Electrical Power 1995年第5期5卷 301-306页

作者： Krebs, S. Oelert, K. Dr.-Ing. Stephan Krebs (1963) received his Diploma degree in 1990 and his Dr.-Ing. degree in 1994 from the Elektrotechnisches Institut Universitat Karlsruhe/Germany. His main fields of interest are the use of modern time-discrete control methods and parallel signal processing in adjusrable speed drive and power supply systems. In summer 1994. he joined the Power Group of the Department of Electrical and Computer Engineering of the University of Toronto/Canada where he is currently working on industrial controller platform for power applications. (Department of Electrical and Computer Engineering University of Toronto 10 King's College Rd. TorontoiOntario. Canada M5S 1A4 T+416/978-66 18 Fax +416/971-2325) Kai Oelert (1967) received the Electrical Engineering degree from the Elektrotechnisches Institut of the University of KarlsruhdGermany in 1993. He is currently developing software for automatic ticket-wending systems with the Company Scheidt & Bachmann Monchengladbach/Germany. (Scheidt & Bachmann GmbH Breite Str. 132 D-4 1238 Monchengladbach/Germany T+2166/266445 Fax+2166/2666 15)

Adjustable speed drive systems using AC‐machines are often fed by voltage‐source inverters. This paper presents a new strategy to control the line‐side converter. State‐space and fuzzy methods are combined to achieve a control system which includes control limits and the aspects of safety. Experiments with a drive system (30 kW) demonstrate the dynamic and steady‐state behaviour of the control. Copyright © 1995 John Wiley & Sons, Ltd.

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

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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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Development and application of MCAL tools for marine radar instruction

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computer Applications in engineering Education 1995年第4期3卷 259-259页

作者： Guirguis, S. Korany, E. Abdel-Bary, A. Institute of Graduate Studies and Research Alexandria University Alexandria Egypt Shawkat K. Guirguis:obtained the BSc and M.Sc. degrees in Computer Science and Automatic Control Faculty of Engineering Alexandria University in 1981 and 1984 respectively. In 1988 he obtained a PhD degree in Electronics and Communications Faculty of Engineering Cairo University co-supervised by the Imperial College of Science and Technology University of London where he spent two years as an academic visitor. His current research interests include software quality management multimedia automatic programming and decision support systems. He is currently a lecturer of Computer Science at the Institute of Graduate Studies & Research Alexandria University. Ezzat A. Korany:received the BS degree in Electrical Engineering (Electronics Section) from the University of Alexandria Egypt in 1971 the MS degree in Electrical Engineering (Computer Section) from Ain Shams University Cairo Egypt in 1977 and the PhD degree in Electrical Engineering (Digital Systems) from Florida Institute of Technology U.S.A. in 1982. He is currently an associate professor of Computer Science at the Institute of Graduate Studies & Research University of Alexandria. His research interests are in data communications and multimedia applications computer networks image processing and pattern recognition. Abdel-Latif A. Abdel-Bary:obtained the BEng degree in Electronics Technology from Arab Maritime Transport Academy in 1986. In 1995 he obtained the MSc degree in Information Technology from the Institute of Graduate Studies & Research Alexandria University. His current research interests include ICAL hypermedia and automatic programming.

In this article a multimedia computer-assisted learning (MCAL) system is presented. The major objective of this work was to investigate the potential of using such systems as tools for transferring instructional course information through various types of computer media as opposed to the classic CAL systems. The philosophy and techniques employed to design the system are investigated. Usage of the implemented system and its merits have been illustrated through its application to teach engineering students and technicians the theory and concepts of marine radar. System design, implementation, test, and revision phases are presented and discussed.

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Development of multimedia modules for education

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computer Applications in engineering Education 1995年第2期3卷 97-97页

作者： Iskander, M.F. Catten, J.C. Jameson, R. Jones, A. Balcells, A. CAEME Center College of Engineering University of Utah Salt Lake City Utah 84112 Dr. Iskander edited a book onMicrowave Processing of Materialspublished by the Materials Research Society in 1994 and authored a textbook onElectromagnetic Fields and Waves published by Prentice Hall 1992. He edited theCAEME Software Book Vol. I 1991 Vol. II 1994 and coedited two other books onMicrowave Processing of Materials both published by the Materials Research Society in 1991 and 1992. Dr. Iskander edited two special issues of theJournal of Microwave Power one on “Electromagnetics and Energy Applications” March 1983 and the other on “Electromagnetic Techniques in Medical Diagnosis and Imaging” September 1983. He also edited a special issue of theACES Journalon computer-aided electromagnetics education. He has published over 150 papers in technical journals and made numerous presentations in technical conferences. Dr. Iskander is the editor of the journalComputer Aplications in Engineering Education (CAE) published by John Wiley & Sons Inc. He is a fellow of IEEE and a member of the National Research Council Committee on Microwave Processing of Materials. His present fields of interest include the use of numerical techniques in electromagnetics. Rex M. Jameson:received his BS in Physics from Stanford University in 1992 and his ME in Electrical Engineering from the University of Utah in 1995. He currently works for the CAEME Center as a programmer. Antony K. Jones:has extensive experience with three-dimensional computer-rendered graphics on Macintosh Amiga and PC platforms. He has had years of commercial experience with the design and printing of computer-generated graphics. Albert R. Balcells:received a Telecommunication Engineering degree in 1994 from the Superior School of Telecommunication of Barcelona Polytechnic University of Catalunya (EC) and is currently pursuing a MS degree in Electrical Engineering from the University of Utah. He has experience in DOS and UNIX-based systems and is fluent in C C++

Development of multimedia modules and courses for engineering education present a significant opportunity to modernize curricula and improve the effectiveness of teaching and learning. In this article we review the various hardware and software components required to develop multimedia lessons and discuss the role of each component in the structure of a multimedia module. Examples of multimedia lessons developed for CD-ROM distribution by the Center for Multimedia Education and Technology (CAEME) at the University of Utah are described. These include multimedia lessons in electromagnetics, the Calculus Castle, and the Physics Museum. It is shown that although extensive resources and expertise are often needed to develop these modules, development software and associated technologies are readily available and educators are encouraged to take advantage of these opportunities to reform, restructure, and improve engineering education.

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A FRAMEWORK FOR SOURCE CODE SEARCH USING PROGRAM PATTERNS

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IEEE TRANSACTIONS ON software engineering 1994年第6期20卷 463-475页

作者： PAUL, S PRAKASH, A Software Systems Research Laboratory Dept. of Electrical Engineering & Computer Science University of Michigan Ann Arbor MI 48105 USA

For maintainers involved in understanding and reengineering large software. locating source code fragments that match certain patterns is a critical task. Existing solutions to the problem are few, and they either involve manual, painstaking scans of the source code using tools based on regular expressions, or the use of large, integrated software engineering environments that include simple pattern-based query processors in their tool-kits. We present a framework in which pattern languages are used to specify interesting code features. The pattern languages are derived by extending the source programming language with pattern-matching symbols. We describe SCRUPLE, a finite state machine-based source code search tool, that efficiently implements this framework. We also present experimental performance results obtained from a SCRUPLE prototype, and the user interface of a source code browser built on top of SCRUPLE.

关键词： REVERSE engineering software MAINTENANCE software REengineering PROGRAM UNDERSTANDING PATTERN MATCHING QUERY LANGUAGE

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Support for the file system security requirements of computational e-mail systems 94

Support for the file system security requirements of computa...

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Proceedings of the 2nd ACM Conference on computer and Communications Security

作者： Jaeger, Trent Prakash, Atul Software Systems Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI

ISBN: (纸本)9780897917322

Computational e-mail systems, which allow mail messages to contain command scripts that automatically execute upon receipt, can be used as a basis for building a variety of collaborative applications. However, their use also presents a serious security problem because a command script from a sender may access/modify receiver's private files or execute applications on receiver's behalf. Existing solutions to the problem either severely restrict I/O capability of scripts, limiting the range of applications that can be supported over computational e-mail, or permit all I/O to scripts, potentially compromising the security of the receiver's files. Our model, called the intersection model of security, permits I/O for e-mail from trusted senders but without compromising the security of private files. We describe two implementations of our security model: an interpreter-level implementation and an operating systems-level implementation. We discuss the tradeoffs between the two implementations and suggest directions for future work.

关键词： file systems security computer-supported cooperative work active email groupware collaboration technology computational email

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Process-sensitive software engineering environments: An object-oriented view 1

Process-sensitive software engineering environments: An obje...

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1st Asia-Pacific software engineering Conference, APSEC 1994

作者： Kang, Min Grant, D.D. Centre for Systems Methodologies School of Computer Science and Software Engineering Swinburne University of Technology HawthornVIC3122 Australia

ISBN: (纸本)0818669608

An object-oriented model is proposed, designed as a collection of layered components, for process-sensitive software engineering environments (PSEEs). In the model, three types of object (process objects, entity objects and service objects) are identified to abstract and reflect the behaviour in different aspects of a PSEE. An overview of object interaction patterns, which reflects and captures the relationships between these types of object, is presented. To support software development process distribution and concurrency effectively, we introduce the actor (concurrent object) concept into process objects and entity objects, which allows transparent message passing between objects without concern for location and synchronisation. © 1994 IEEE.

关键词： Message passing

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DistView: Support for building efficient collaborative applications using replicated objects 94

DistView: Support for building efficient collaborative appli...

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1994 ACM Conference on computer Supported Cooperative Work, CSCW 1994

作者： Prakash, Atul Shim, Hyong Sop Software Systems Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109-2122 United States

ISBN: (纸本)0897916891

The ability to share synchronized views of interactions with an application is critical to supporting synchronous collaboration. This paper suggests a simple synchronous collaboration paradigm in which the sharing of the views of user/application interactions occurs at the window level within a multi-user, multi-window application. The paradigm is incorporated in a toolkit, DistView, that allows some of the application windows to be shared at a fine-level of granularity, while still allowing other application windows to be private. The toolkit is intended for supporting synchronous collaboration over wide-area networks. To keep bandwidth requirements and interactive response time low in such networks, DistView uses an object-level replication scheme, in which the application and interface objects that need to be shared among users are replicated. We discuss the design of DistVlew and present our preliminary experience with a prototype version of the system. © 1994 ACM.

关键词： Groupware

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A Bayesian corner detector

A Bayesian corner detector

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The 1994 1st IEEE International Conference on Image Processing

作者： Zhang, Xining Haralick, R.M. Ramesh, V. Bedekar, A.S. Phillips, I. Intelligent Systems Laboratory Department of Electrical Engineering FT-10 University of Washington SeattleWA98195 United States Department of Computer Science and Software Engineering Seattle University SeattleWA98122 United States

A corner is modelled as the intersection of two lines. A corner point is that point on an input digital arc whose a posteriori probability of being a corner is the maximum among all the points on the arc. The performance of the corner detector is characterized by its false alarm rate, misdetection rate, and the corner location error all as a function of the noise variance, the included corner angle, and the arc length. Theoretical expressions for the quantities compare well with experimental results. © 1994 IEEE.

关键词： Edge detection

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Visualization using timelines 94

Visualization using timelines

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Proceedings of the 1994 International Symposium on software Testing and Analysis (ISSTA)

作者： Karam, Gerald TRIO Telecommunications Software Methods Project Real-time and Distributed Systems Group Department of Systems and Computer Engineering Carleton University 1125 Colonel By Drive Ottawa Ontario CANADA K1S 5B6

ISBN: (纸本)9780897916837

A timeline is a linear, graphical visualization of events over time. For example, in concurrent application, events would represent state changes for some system object (such as a task or variable). A timeline display generator creates the graphical visualization from some record of events. This paper reports on a model for timeline display generators based on a formal model of event history and the objectives of timeline visualization. In this model, any timeline display generator is completely described through the definition of a set of mathematical functions. The exact characteristics and flexibility of a particular implementation of a timeline display generator, depends on the way in which these functions have been implemented. The current prototype, xtg, (Timeline Display Generator for X-windows) serves as an example implementation of these ideas. Characteristics of xtg are presented, and its use in the analysis of a real-world client-server application is discussed. Xtg has been applied to several other applications to-date and is being applied by several telecommunications companies to areas ranging from software process analysis to call trace data analysis.

关键词： Application programs

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