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CONCURRENT LARGE-SIGNAL SIMULATION OF AN ACTIVE MICROSTRIP ANTENNA

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第1期8卷 3-12页

作者： MCDOWALL, DS FUSCO, VF High Frequency Electronics Laboratory. Department of Electrical and Electronic Engineering The Queen's University of Belfast Ashby Building Stranmillis Road Belfast BT9 5AH U.K. D. Stewart McDowall was born in Dublin Republic of Ireland in 1967. He received the M. Eng. degree in Electrical and Electronic Engineering from the Queen's University of Belfast in 1990. In the same year he was presented with a Distinction Award from the Departmnet of Education of Northern Ireland and he is currently pursuing his Ph.D. in the Microwave Research Group at Q.U.B. His principal research area is the electromagnetic field mapping of microwave systems using concurrent programming. He is an Associate Member of the Institute of Electrical Engineers. Vincent F. Fusco was educated at the Queens's University of Belfast where he obtained the degree of Ph.D. in 1982. He has worked as a research engineer on short-range radar and radio telemetry systems. Currently he is a reader in Microwave Communications in the School of Electrical engineering and Computer Science the Queen's University of Belfast. His current research interests include non-linear microwave circuit simulatino and concurrent programming techniques for electromagnetic field problems with particular emphasis on EMC applications. He has published numerous research papers in these areas. He is the author of the bookMicrowave Circuits Analysis and Computer Aided Design Prentice-Hall 1987. Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

This paper details the use of a circuit-based EM modelling technique combined with a harmonic balance simulator used to model the radiation from the microstrip bodies comprising an active antenna circuit. The modelling approach adopted for the planar bodies in the circuit will be shown to allow the use of concurrent algorithms in order to reduce overall computational time.

关键词： Microstrip antennas

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On anti-links 5th

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5th International Conferenceon Logic programming and Automated Reasoning, LPAR 1994

作者： Beckert, Bernhard Hähnle, Reiner Ramesh, Anavai Murray, Neil V. Institute for Logic Complexity and Deduction Systems Universität Karlsruhe Karlsruhe Germany Institute for Programming & Logics Department of Computer Science University at Albany AlbanyNY12222 United States

ISBN: (纸本)9783540582168

The concept of anti-link is defined, and useful equivalence-preserving operations on propositional formulas based on anti-links are introduced. These operations eliminate a potentially large number of subsumed paths in a negation normal form formula. The operations have linear time complexity in the size of that part of the formula containing the anti-link. These operations are useful for prime implicant/implicate algorithms because most of the computational effort in such algorithms is spent on subsumption checks. © Springer-Verlag Berlin Heidelberg 1994.

关键词： Computers

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CONCURRENT BOUNDARY-ELEMENT COMPUTATION

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第2期6卷 83-98页

作者： MCDOWALL, DS LEE, TW FUSCO, VF Microwave Research Group Department of Electrical and Electronic Engineering The Queen's University of Belfast Ashby Building Stranmillis Road Belfast BT9 5AH Northern Ireland U.K. D. Stewart McDowall was born in Dublin epublic of Ireland in 1967. He received the M. Eng. degree in Electrical and Electronic Engineering from the Queen's University of Belfast in 1990. In the same year he was presented with a Distinction Award from the Department of Education of Northern Ireland and he is currently pursuing his Ph.D. in the Microwave Research Group at Q.U.B. His principal research area is the electromagnetic field mapping of microwave systems using concurrient programming. He is an Associate Member of the Institute of Electrical Engineers. Lee Thaim Wee was awarded the degree of B. Eng. in Electronics from the Queen's University of Belfast in July 1991. He is currently serving in the Malaysian Armed Forces. Vincent F. Fusco was educated at the Queen's Univeristy of Belfast where he obtained the degree of Ph.D. in 1982. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a reader in Microwave Communications in the School of Electrical Engineering and Computer Science the Queen's Univeristy of Belfast. His current research interests include non-linear microwave circuit simulation and concurrent programming techniques for electromagnetic field problems with particular emphasis on EMC applications. He has published numerous research papers in these areas. He is the author of the bookMicrowave Circuits Analysis and Computer Aided Design Prentice-Hall 1987. Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

A major limitation of the boundary element method (BEM) for the solution of electrical potential problems is the long computational time required. However, a large portion of the calculations involved can be viewed as being parallel in nature and can therefore be computed concurrently. This paper makes an effort to increase the efficiency of the BEM process using transputer-based multiprocessor computing techniques. The algorithms developed may equally well be applied to any multiprocessor system. The application selected to demonstrate the technique is the solution of an electrostatic problem governed by a two-dimensional Laplace equation. A parallel algorithm for problem setup and field extraction using BEM is designed and implemented on a transputer array. Special attention is directed to the utilization of the parallel processors to achieve maximum efficiency. The analysis in this work concentrates on the communication strategies for passing data between processors as well as a consideration of the workload attributed to each processor. The parallel algorithms were implemented using 3L Parallel Fortran;however, the choice of topology for the overall BEM implementation was limited by the fact that certain parts of the algorithm could only utilize a pipeline configuration of processors. Comprehensive results for the parallel BEM algorithm are given and they are encouraging, indicating that parallel processing has much to offer when applied to the boundary element method.

关键词： Boundary element method

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TLM MODELING USING AN SIMD COMPUTER

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第4期6卷 299-304页

作者： TAN, CC FUSCO, VF The Queen's University of Belfast Department of Electrical & Electronic Engineering Ashby Building Stranmillis Road Belfast BT9 5AH U.K. Chun Chia Tan obtained a first-class honours degree from The Queen's University of Belfast. He was awarded an IEE prize for best final-year project. His current research interests include the modelling of electromagnetic fields using parallel processing techniques. At present Mr Tan is working as an electrical engineer in Malaysia. Vincent F. Fusco was educated at The Queen's University of Belfast where he obtained the degree of Ph.D. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a Reader in Microwave Commnications in the School of Electrical Engineering and Computer Science The Queen's Univeristy of Belfast. His current research interests include non-linear microwave circuit simulation and concurrent programming techniques for electromagnetic field problems. He has acted as consultant to a number of major companies and has published numerous research papers in these areas. He is author of the bookMicrowave Circuits Analysis and Computer Aided Design(Prentice Hall 1987). Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

A major limitation of the transmission-line matrix (TLM) method used to solve Maxwell's equations is the long computation time required. The TLM scattering calculations involved can, however, be viewed as parallel in nature. This paper describes an effort to reduce computational time by using an SIMD, DAP multiprocessor computer employed to solve a two-dimensional TLM electromagnetic field formulation. A parallel algorithm based on the TLM scattering algorithm is designed and implemented using FORTRAN-PLUS Enhanced on an AMT DAP 510 machine. Here the connectivity of the DAP is exploited to simulate the intrinsic scattering behaviour on which the TLM algorithm relies. The results show that parallel processing on an SIMD machine such as the DAP is advantageous, especially for higher-order mesh sizes.

关键词： Electric lines

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COMPOSITIONAL PRIORITY SPECIFICATION IN REAL-TIME DISTRIBUTED systems

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SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES 1992年第1期17卷 75-93页

作者： SHYAMASUNDAR, RK LIU, LY Computer Science Group Tata Institute of Fundamental Research Bombay India IBM Programming Systems Cary Laboratory Cary USA

In this paper, we develop a compositional denotational semantics for prioritized real-time distributed programming languages. One of the interesting features is that it extends the existing compositional theory proposed by Koymans et al (1988) for prioritized real-time languages preserving the compositionality of the semantics. The language permits users to define situations in which an action has priority over another action without the requirement of preassigning priorities to actions for partially ordering the alphabet of actions. These features are part of the languages such as Ada designed specifically keeping in view the needs of real-time embedded systems. Further, the approach does not have the restriction of other approaches such as prioritized internal moves can preempt unprioritized actions etc. Our notion of priority in the environment is based on the intuition that a low priority action can proceed only if the high priority action cannot proceed due to lack of the handshaking partner at that point of execution. In other words, if some action is possible corresponding to that environment at some point of execution then the action takes place without unnecessary waiting. The proposed semantic theory provides a clear distinction between the semantic model and the execution model - this has enabled us to fully ensure that there is no unnecessary waiting.

关键词： COMPOSITIONAL SPECIFICATION REAL-TIME DISTRIBUTED systems PRIORITY SPECIFICATION MESSAGE PASSING MODELS

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A conceptual model of a computer-aided learning knowledge base 2nd

A conceptual model of a computer-aided learning knowledge ba...

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2nd International Conference on Computer Assisted Learning, ICCAL 1989

作者： Spirov, Krasimir Draganov, Mihail Centre of Engineering Pedagogics The ‘Lenin’ Higher Institute of Mechanical and Electrical Engineering Sofia1156 Bulgaria Programming and Applied Systems Department The ‘Lenin’ Higher Institute of Mechanical and Electrical Engineering Sofia1156 Bulgaria

ISBN: (纸本)9783540511427

Recent developments in the theory of artificial intelligence and the advent of the expert systems made it possible to actually produce intelligent systems for computer-aided learning (CAL). A major component of such a system is its knowledge base. The paper presents a model for a knowledge base and an approach to building it. To solve the task set, a sufficiently abstract hierarchical model has been developed of a knowledge base consisting of notions. By definition the model is recursive and subject-independent. The transition to a learning-oriented knowledge base is achieved by using a well-known model for a content-information description of the process of learning. The basic element in it is the ‘elementary cognitive structure’ (ECS), which the authors identify with the ‘notion’ element of the general conceptual model. On this basis a model has been designed of a learning-oriented knowledge base, comprising ECS. The very structure of ECSs that is to be built in the knowledge base could be different, depending on the goals, learning theories and strategies, the students' individual characteristics, etc. © Springer-Verlag Berlin Heidelberg 1989.

关键词： Expert systems

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Author's reply

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Journal of Sound and Vibration 1989年第1期132卷 157-159页

作者： I.N. Jordanov Department of Programming and Computing Systems Applications Higher Institute of Mechanical and Electrical Engineering Sofia 1156 Bulgaria

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CLEER - AN AI-SYSTEM DEVELOPED TO ASSIST EQUIPMENT ARRANGEMENTS ON WARSHIPS

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NAVAL ENGINEERS JOURNAL 1989年第3期101卷 127-137页

作者： ZHOU, HH SILVERMAN, BG SIMKOL, J Dr. H. Harry Zhou:is a research professor at the Institute for Artificial Intelligence of The George Washington University. Dr. Zhou received his master's degree and Ph.D. in computer science from Vanderbilt University in 1984 and 1987 respectively. He did his dissertation in the fields of artificial intelligence analogical reasoning and machine learning. His research interests include: classifier systems genetic algorithms learning by analogy inductive learning adaptive expert systems automated knowledge acquisition and adaption. He is also interested in data base design programming languages mental modeling and software engineering. Dr. Barry G. Silverman:is director of the Institute for Artificial Intelligence and a professor at the Engineering Administration Department of The George Washington University. He is also president of IntelliTek Inc. an AI consulting firm. Dr. Silverman received the B.S.E. M.S.E. and Ph.D. degrees from the University of Pennsylvania. He has been a principal developer of four generic AI products as well as eight AI applications. Since 1979 he has written over 100 papers and reports on these AI efforts. Joel Simkol:is a research scientist currently engaged in designing expert system architectures to support electronic warfare vulnerability analyses threat assessments shipboard topside antenna arrangements and C3countermeasures employment. Mr. Simkol's work in applying expert systems technology to electromagnetic interference and to spectrum management has generated increased interest and participation from all branches of government agencies.

This paper describes a modularized AI system being built to help improve electromagnetic compatibility (EMC) among shipboard topside equipment and their associated systems. CLEER is intended to act as an easy to use integrator of existing expert knowledge and pre-existing data bases and large scale analytical models. Due to these interfaces; to the need for portability of the software; and to artificial intelligence related design requirements (such as the need for spatial reasoning, expert data base management, model base management, track-based reasoning, and analogical (similar ship) reasoning) it was realized that traditional expert system shells would be inappropriate, although relatively off-the-shelf AI technology could be incorporated. In the same vein, the rapid prototyping approach to expert system design and knowledge engineering was not pursued in favor of a rigorous systems engineering methodology. The critical design decisions affecting CLEER's development are summarized in this paper along with lessons learned to date all in terms of “how,” “why,” and “when” specific features are being developed.

关键词： Artificial Intelligence

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The FX-87 Interpreter

The FX-87 Interpreter

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International Conference on Computer Languages

作者： P. Jouvelot D.K. Gifford Programming Systems Research Group Laboratory for Computer Science Massachusetts Institute of Technology Cambridge MA USA

The first implementation of the programming language FX-87, a polymorphic typed functional language based on a system for static program analysis, is described. This polymorphic effect system integrates type checking and side-effect analysis into a single framework and allows the automatic detection of parallelizable expressions at compile-time. In FX-87, every expression has two static properties: a type and an effect. Type and effect polymorphism permits the behavior of first-class procedures to be statically modeled. The integration of type and effect analysis has resulted in the first system that is able (by accurate modeling of the side-effects of procedure values and masking of unobservable effects in the heap) to detect a compile-time, parallelizable constructs in both functional and imperative programs.< >

关键词： programming profession Job shop scheduling Computer languages Parallel programming Parallel machines Program processors Functional programming Laboratories Computer science Performance analysis

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Distributed Computer System for Adaptive Control of LD Convertor Steel Making

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IFAC Proceedings Volumes 1988年第19期21卷 299-302页

作者： A.N. Georgieva P.A. Bayrov I.N. Ivanchev M.S. Gerasimova S.R. Simeonov Department of Programming and Computer Systems Application Higher Institute of Chem. Technology 1156 Sofia Bulgaria Department of Black Metallurgy Higher Institute of Chem Technology 1156 Sofia Bulgaria

An adaptive algorithm for LD converter steel refining control is presented. Avoiding the traditionally used balance approach, here a real-time process parameters estimation and control is applied. A Recursive Least Squares method is used and a minimum variance control strategy is realized. The original idea is that the converter steel making process| is considered as a continuous process which is sampled and one heat time is considered as one sample time. So, the process model parameters are adjusted after each heat and the algorithm adapts very fast to the technological conditions chanson. A distributed PS/XT computer two-leves control system is realized. Successful industrial results are obtained.

关键词： Time-varying systems multivariable control systems parameter estimation adaptive control computer control steel refining process

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