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CONCURRENT BOUNDARY-ELEMENT COMPUTATION

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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Time - Varying frequency tracker with adaptive pole contraction

Time - Varying frequency tracker with adaptive pole contract...

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1992 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 1992

作者： Dragošević, Marina V. Stanković, Srdjan S. Boris Kridič Institute of Nuclear Sci. Computer System Design Dept. P.O. Box 522 Belgrade11001 Serbia University of Belgrade School of Electrical Engineering Belgrade Serbia

ISBN: (纸本)0780305329

The tracking properties of an adaptive notch filter with constrained poles and zeros and with data adaptive notch bandwidth are analyzed. This adaptive filter is applicable for slowly time-varying frequency tracking of multiple narrowband signal components corrupted by additive broadband noise. Some new quantitative criteria for the selection of the algorithm design parameters are established. © 1992 IEEE.

关键词： Adaptive filters

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Time-varying frequency tracker with adaptive pole contraction

Time-varying frequency tracker with adaptive pole contractio...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： M.V. Dragosevic S.S. Stankovic Computer System Design Department 270 Boris Kidrič Institute of Nuclear Sciences Belgrade Serbia School of Electrical Engineering University of Belgrade Belgrade Serbia

关键词： Additive noise Adaptive filters Bandwidth Narrowband Frequency estimation Least squares approximation Poles and zeros Algorithm design and analysis Data mining Filtering

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Arrays. A software package for analysis of antenna arrays

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computer Applications in engineering Education 1992年第1期1卷 109-109页

作者： Elsherbeni, A.Z. Ginn, P.H. Electrical Engineering Department University of Mississippi University Mississippi 38677 Dr. Atef Z. Elsherbeni:received an honorary BSc in Electronics and Communications an honorary BSc in Applied Physics and an MEng in Electrical Engineering all from Cairo University Cairo Egypt in 1976 1979 and 1982 respectively. He also received a PhD in Electrical Engineering from Manitoba University Winnipeg Manitoba Canada in 1987. He was a research assistant with the faculty of Engineering at Cairo University from 1976 to 1982 and at the Electrical Engineering Department Manitoba University from 1983 to 1986 and a Postdoctoral fellow in the same department from January to August 1987. He joined the faculty at the University of Mississippi in August 1987 where he is currently an Associate Professor of Electrical Engineering. During the last few years he was involved in developing software for undergraduate education related to electromagnetic waves and antenna design courses. His professional interests include microstrip antennas scattering and diffraction of electromagnetic waves numerical techniques and computer applications for electromagnetics education. He has authored or coauthored over 80 technical papers and reports on applied electromagnetics antenna design and microwave subjects. Dr. Elsherbeni is a senior member of the Institute of Electrical and Electronics Engineers (IEEE) belonging to the Antennas and Propagation Microwave Theory and Techniques and Magnetics Societies. His honorary memberships include the Electromagnetics Academy and the Scientific Sigma Xi Society. Patrick Ginn:was born in Corinth Mississippi on June 30 1969. Mr. Ginn attended Kossuth High School where he was awarded the STAR student award. He attended Northeast Mississippi Junior College from 1987 to 1989. In 1989 he began attending the University of Mississippi. He is currently enrolled as an undergraduate in the Electrical Engineering Department. Mr. Ginn expects to receive his BSEE in August 1992. He has r

This article describes a software package useful for the instruction of antenna array theory. The program provides the radiation pattern of different types of antennas, the array factor of linear, two-dimensional and three-dimensional arrays, and the total radiation pattern. The elements of the array are isotropic source, Hertzian dipole, straight thin wire dipole, and finite line source with uniform current distribution. The user has the freedom to choose one of the supported element types or to provide the pattern of an antenna element based on experimental or calculated data. This article serves as a tutorial for selected examples as well as a quick guide for the use of this software.

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Orientation and insertion of randomly presented parts using vibratory agitation

Orientation and insertion of randomly presented parts using ...

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ASME 1991 design Technical Conferences, DETC 1991

作者： Moncevicz, Paul H. Jakiela, Mark J. Ulrich, Karl T. Department of Mechanical Engineering Massachusetts Institute of Technology Computer-Aided Design Laboratory CambridgeMA United States Massachusetts Institute of Technology Sloan School of Management CambridgeMA United States

ISBN: (纸本)9780791807491

In this article, we propose a new approach to automated assembly. Currently, automated assembly is expensive and difficult because all of the machines required for its implementation impose organization on the parts being assembled. It is this organization that is costly. We investigate an approach that requires less organization and results in assembly as a bulk process. We describe an initial implementation of this approach with a particular parts presentation system. Experiments are performed to determine the part characteristics that promote the success of the implementation. The experimental results are described and future work is suggested. © 1991 American Society of Mechanical Engineers (ASME). All rights reserved.

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SMALL SHIPS, ADVANCED TECHNOLOGY AND WARFIGHTING PERFORMANCE

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NAVAL ENGINEERS JOURNAL 1991年第3期103卷 30-45页

作者： SKOLNICK, DH SKOLNICK, A David H. Skolnickhas practiced naval engineering in both government and industry. He has supported the Military Sealift Command and the Naval Sea Systems Command Ship Design Group and Amphibious Ship Acquisition Program Office participating in the design and assessment of ship structure evaluation of intact and damaged stability and arrangements during design and construction phases of acquisition conversion and overhaul. He is currently involved in systems engineering and integration. Recent responsibilities have included requirements analyses and feasibility studies interface analyses and computer aided analyses. He received his B.S. in naval architecture and marine engineering from Webb Institute of Naval Architecture in 1982 (as an ASNE scholar) and is currently an M.S. candidate in systems engineering at the University of Virginia. Alfred Skolnickserved over 30 years as an engineering duty officer and retired from the Navy with the rank of captain in 1983. His early assignments included tactical missile engineering shipboard duty and Polaris submarine inertial navigation. He later served in the Deep Submergence Systems Project was project director surface effect ships (SES) David Taylor Model Basin director of technology Joint Navy-Commerce SES Program director combat systems Naval Sea Systems Command and project manager directed energy weapons. His awards include the Navy League's Parsons Award in 1979 for scientific and technical progress ASNE's Gold Medal in 1981 for high energy laser development the Navy Legion of Merit in 1983 National Capital Engineer of the Year in 1986 and the American Defense Preparedness Association Gold Medal in 1988 for contributions to strategic defense. He was president of ASNE from 1985–1989. He received his B.S. in mathematics from Queens College his M.A. in mathematics from Columbia University his M.S. in electrical engineering from U.S. Naval Postgraduate School and his Ph.D. in electrical engineering/applied mathematics from Polytechnic University. He w

Changing threat requirements and radical budget shifts imply that Navy operational needs will broaden and engineering solutions will face tougher constraints. Existing and emerging technology promise increased combat capability in smaller packages;space-based assets will allow operator orchestration of widely dispersed naval units via connectivity attributes previously unavailable. Tactical data relay by downlink may permit reallocation of responsibilities among several platforms, space, air, or seaborne, so ships can be outfitted for custom-use (sensing, unique data processing, high-firepower) and optimized to meet specific mission needs. These evolving capabilities demand a fresh look at ship concepts and prospective force structures consistent with global and fiscal realities. Warfighting performance formerly unknown in small ship design may offer a very effective solution to the intricate, interacting issues of falling defense budgets, diverse operational requirements and complex national priorities. Multimission ships which take advantage of new or current technology to reduce ship size, manning and cost could be affordable in sufficient numbers to meet our continuing worldwide obligations, complement our larger ships' force structure, and produce a balanced fleet. These same ships could satisfy U.S. maritime needs beyond the Navy and improve export trade through foreign military sales (FMS).

关键词： Naval Warfare

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RAMP - A TEST BED FOR THE NAVY USE OF PDES PRODUCT DATA

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NAVAL ENGINEERS JOURNAL 1990年第3期102卷 100-110页

作者： KIRKSHARIAN, A The Author:is a project engineer in the Advanced Logistics Technology Division of the Naval Supply Systems Command Washington DC. Since 1987 Mr. Kirksharian has been involved in the system design of the RAMP R&D project. He acquired a B. S. degree in mechanical engineering in 1978 from the George R. Brown School of Engineering at Rice University. After several years of project engineering in the energy industry he received his M.S. degree in mechanical engineering in 1987 from Texas A&M University. Mr. Kirksharian has authored on the subject of computer-aided manufacturing with the American Society of Mechanical Engineers and is a member of the Society of Manufacturing Engineers. His current interests include computer-aided manufacturing applications and their impact on the Navy's industrial modernization programs.

The Rapid Acquisition of Manufactured Parts (RAMP) Project is a U.S. Navy program employing computer-integrated manufacturing (CIM) technologies and computer-Aided Acquisition and Logistics Support (CALS) standards to facilitate parts procurement in the Navy supply system. As an R&D manufacturing/logistics program administered through the Naval Supply Systems Command (NavSup), RAMP is serving as a test bed for the ordering and manufacturing of parts using prototype versions of the Product Data Exchange Specification (PDES). The central theme of this paper is to highlight the objectives of RAMP which include (1) the integration of CIM technologies into the Navy logistics system, (2) the specification of procedures and standards to communicate part requirements to automated manufacturing activities, and (3) the installation of flexible CIM cells in Navy industrial sites. In large measure, the eventual success of RAMP will corroborate the feasibility of using neutral product data standards to procure and maintain naval weapon systems in the 1990s and beyond.

关键词： Military engineering

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COMPARATIVE STRUCTURAL LIFE ASSESSMENT OF PATROL BOAT BOTTOM PLATING

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NAVAL ENGINEERS JOURNAL 1990年第3期102卷 253-262页

作者： AYYUB, BM WHITE, GJ BELLWRIGHT, TF PURCELL, ES Bilal M. Ayyub:is currently an associate professor of civil engineering at the University of Maryland. He received his B.S. degree in civil engineering from the University of Kuwait in 1980. He completed both his M.S. (1981) and Ph.D. (1983) in civil engineering at the Georgia Institute of Technology. Dr. Ayyub has an extensive background in risk-based analysis. He is engaged in research work involving structural reliability marine structures and mathematical modeling using the theories of probability statistics and fuzzy sets. His research work has been sponsored by the National Transportation Safety Board National Science Foundation U.S. Coast Guard Department of Defense State of Maryland and University of Maryland. He is the author of more than 100 publications in national and international journals conference proceedings and reports. Dr. Ayyub was a recipient of the ASNE “Jimmie” Hamilton Award for 1985 the ASCE “Outstanding Research Oriented Paper” in theJournal of Water Resources Planning and Managementfor 1987 and Edmund Friedman Young Engineer Award for Professional Achievement from ASCE for 1989. Gregory J. White:is an associate professor of naval architecture at the U.S. Naval Academy. He received his B.S. degreein engineering mechanics from Vanderbilt University in 1975 an M.E. degree in naval architecture from the University of California Berkeley in 1981 and a Ph.D. in civil engineering (structures) from the University of Maryland in 1986. Dr. White served on active duty with the U.S. Navy from 1975 to 1979 as a junior officer in the engineering and operations departments of Pacific Fleet destroyers. Prior to coming to the Naval Academy he worked at Mare Island Naval Shipyard in the scientific code and in the R&D division of Exxon International company's Tanker Department. Dr. White is the author of more than two dozen technical articles and reports and is one of the U.S. representatives to the International Ship and Offshore Structures Congress (ISSC). His research interests lie in t

The estimation of an absolute life expectancy of a structure is a complex process and the results are expected to have relatively large levels of uncertainty. In this study, a comparative analysis is undertaken between two different patrol boats. This is an approach which results in a higher confidence level because certain factors common to both boats can be eliminated by assuming them to be at constant normal levels. The study is limited to the critical forward bottom plating and takes into account the differences in material, plate dimensions, operational profile, structure and loading of the two vessels. Two failure modes, plastic plate deformation and fatigue, are considered, and a novel approach to plate wastage is included. Many factors affect the structural life of a vessel. They include structural type, operational profile, structural details, loads, inspection and maintenance, design methods, safety factors, corrosion, and environmental factors. There are three types of uncertainty associated with these factors; namely, physical randomness, statistical uncertainties, and model uncertainties. The method described is designed to address these uncertainties. The objective of the paper is to present the reliability-based structural life assessment method, and then to use it to evaluate and compare the structural performance of the forward bottom plating of the two patrol boats. The results of the evaluation are presented in the form of graphs and tables in order to facilitate the comparative evaluation. The method is performed within a computer-based format which allows parametric sensitivity analysis of several variables including the size of the plating panel, thickness, operational profile and loading. The sensitivity of the structural life expectancy of the forward bottom plating to variations in these parameters is evaluated.

关键词： Naval Vessels

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designs for diagnosability and reliability in VLSI systems

Designs for diagnosability and reliability in VLSI systems

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IEEE International Test Conference

作者： S.Y.H. Su H. Ma Department of Computer Science Research Group on Design Automation and Fault-tolerant Computing Thomas J. Watson School of Engineering Applied Science and Technology State University of New York Binghamton Binghamton NY USA Department of Electrical Engineering Research Group on Design Automation and Fault-tolerant Computing Thomas J. Watson School of Engineering Applied Science and Technology State University of New York Binghamton Binghamton NY USA

Novel concepts of designs for diagnosability and reliability are defined and developed. A diagnosable design of VLSI system is presented, in which fault isolation is realized by minimal additional hardware instead of traditional software diagnostic procedures such that the computation space and time for fault isolation are saved. The presented fault-tolerant design uses online fault detection and isolation techniques, yields higher reliability with minimized hardware overhead of no more than 125% as opposed to over 200% in classical redundancy fault-tolerant designs. Using this scheme, the ability to isolate intermittent faults is a significant improvement over existing fault isolation methods because faults could be isolated right after they are detected.< >

关键词： Very large scale integration Circuit faults Fault detection Costs Hardware Automatic testing Digital systems Fault tolerance Redundancy Electrical fault detection

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Reviews

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Local Economy 1988年第1期3卷 54 - 78页

作者： Neil Woodroffe David Isaac John Henneberry Robert Kraushaar John Bryden Dick Pratt Jim Brown Juliet Webster David North School of Applied Economics and Social Studies South Bank Polytechnic School of Surveying Thames Polytechnic Department of Urban and Regional Studies Sheffield City Polytechnic Department of Environmental Design and Planning State University of New York at Buffalo The Arkleton Trust City of Birmingham Polytechnic Faculty of Engineering and Computer Technology Leeds CAITS (Centre for Alternative Industrial and Technological Systems) Polytechnic of North London School of Geography and Planning Middlesex Polytechnic

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