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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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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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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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A Bayesian corner detector

A Bayesian corner detector

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IEEE International Conference on Image Processing

作者： Xining Zhang R.M. Haralick V. Ramesh A.S. Bedekar I. Phillips Intelligent Systems Laboratory Department of Electrical Engineering University of Washington Seattle WA USA Department of Computer Science And Software Engineering Seattle University Seattle WA USA

关键词： Bayesian methods Detectors Image segmentation Image edge detection Zirconium Intelligent systems Laboratories computer science software engineering Detection algorithms

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Domain based testing: increasing test case reuse

Domain based testing: increasing test case reuse

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IEEE International Conference on computer Design: VLSI in computers and Processors, (ICCD)

作者： A. von Mayrhauser R. Mraz J. Walls P. Ocken Department of Computer Science Colorado State University USA Advanced Systems Division Hewlett Packard Company Software Engineering Group Storage Technology Corporation

Domain based testing (DBT) is a test generation method based on two concepts from software reuse, domain analysis and domain modeling. We applied DBT to command-based systems where the domain model represents the syntax and semantics of the command language. The domain model drives the generation of test cases. The test generation process consists of three stages: scripting; command template generation; and parameter value selection. Because it is based on ideas from software reuse, DBT also provides a good structure for test case reuse. Production use of the DBT tool Sleuth to generate system tests for an automated robot tape library confirms that DBT provides a wide variety of test case reuse scenarios.< >

关键词： computer aided software engineering System testing Command languages Automatic testing software testing computer science Production systems Logic testing Robotics and automation software libraries

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software technology risk advisor

Software technology risk advisor

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Knowledge-Based software engineering Conference

作者： G.A. Toth USC Center For Software Engineering Department of Computer Science University of Southern California Los Angeles CA USA Electronics Systems Division Northrop Grumman Corporation Hawthorne CA USA

This paper describes the software Technology Risk Advisor (STRA), a knowledge-based software engineering tool that provides assistance in identifying and managing software technology risks. The STRA contains a knowledge base of software product and process needs, satisfying capabilities and capability maturity factors. After a user ranks the importance of relevant needs to his or her project, the STRA automatically infers risk areas by evaluating disparities between project needs and technology maturities. Identified risks are quantitatively prioritized and the user is given risk reduction advice and rationale for each conclusion. This paper presents methods used in the STRA, along with discussions of knowledge acquisition experimental results, current status, and related work.< >

关键词： Risk management software tools software engineering Knowledge management Programming Technology management Expert systems Application software computer science engineering management

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Effect of test set size and block coverage on the fault detection effectiveness

Effect of test set size and block coverage on the fault dete...

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International Symposium on software Reliability engineering (ISSRE)

作者： W.E. Wong J.R. Horgan S. London A.P. Mathur Hughes Network Systems Germantown MD USA Bell Communications Research Inc. Morristown NJ USA Software Engineering Research Center Department of Computer Sciences Purdue University West Lafayette IN USA

Size and code coverage are two important attributes that characterize a set of tests. When a program P is executed on elements of a test set T, we can observe the fault-detecting capacity of T for P. We can also observe the degree to which T induces code coverage on P according to some coverage criterion. We would like to know whether it is the size of T or the coverage of T on P which determines the fault detection effectiveness (FDE) of T for P. We found that there is little or no reduction in the FDE of a test set when its size is reduced while the all-uses coverage is kept constant. These data suggest, indirectly, that coverage is more correlated than the size with the FDE. To further investigate this suggestion, we report an empirical study to compare the statistical correlation between (1) FDE and coverage, and (2) FDE and the size. Results from our experiments indicate that the correlation between FDE and block coverage is higher than that between FDE and size.< >

关键词： Fault detection Genetic mutations Cities and towns software engineering Intelligent networks software testing Costs

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A standard simulation environment: a review of preliminary requirements 94

A standard simulation environment: a review of preliminary r...

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Simulation Winter Conference

作者： M.A.F. Wagner S. Sevinc O. Tanir P.L. Haigh J.D. Arthur R.E. Nance H.D. Schwetman SysTech Software Solutions Annandale VA USA Knowledge Systems Group Basser University of Sydney Australia Quality Engineering and Research (QER) Group Longueuil QUE Canada High Performance Software Inc. Dayton OH USA Systems Research Center Department of Computer Science Virginia Polytechnic Institute and State University Blacksburg VA USA Mesquite Software Inc. Austin TX USA

ISBN: (纸本)9780780321090

The concept of a simulation environment combines different aspects of the simulation process into one complete powerful tool. The environment should provide the necessary state-of-the-art advances and concepts that a modeler may require during the simulation development and execution process. The "environment" requirements must address the end user needs while minimizing the necessity of learning a new language. The requirements must specify the useful features, independent of different platforms and implementation languages. Hence the opportunity exists for standardization of environments. The paper opens a discussion on challenges and rewards awaiting the simulation community with the advent of a standard environment.

关键词： Power system modeling Computational modeling computer simulation Standardization Knowledge based systems Australia Knowledge engineering software performance Drives computer science

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