检索结果-内蒙古大学图书馆

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

来源：评论

学校读者我要写书评

暂无评论

SHIPBOARD DAMAGED STABILITY ASSESSMENT - THE FLOODING CASUALTY CONTROL SOFTWARE

引用

NAVAL ENGINEERS JOURNAL 1993年第3期105卷 152-166页

作者： ZAHN, PB ROSBOROUGH, J CARLSTROM, R Peter B. Zahn:is a section chief in the Naval Architecture Department at Advanced Marine Enterprises. He is responsible for software development and special trials support. He has led the Flooding Casualty Control Software (FCCS) development effort since joining AME in 1989. He is also responsible for the material handling strikedown and stowage (MHS&S) software development program as well as special trials support for the ACVLAP and T-AGOS 19 programs. Prior to joining AME Mr. Zahn spent nine years with various companies of the ARCTEC Group. His experience includes field trials in venues from the Caribbean to the Bering Sea as well as model tests and engineering design and development efforts. Mr. Zahn received his B.S. in naval architecture and marine engineering from Webb Institute in 1980 and has published various papers on pollution prevention offshore systems and icebreaker design and performance. He is a member of ASNE and SNAME. John Rosborough:has been a naval architect for the Naval Sea Systems Command (NavSea) for the past 15 years. He is currently assigned to the Hydrodynamics Division with responsibility for aircraft carrier stability evaluations and as a task leader for computer-aided ship design development. In the Stability Division he was previously responsible for stability analyses on various amphibious ships SWATHs and foreign ships. He manages the upgrade and augmentation of SHCP at NavSea and is the Navy's technical point of contact for evaluating shipboard stability software and transitioning technology to the fleet. Mr. Rosborough received his B.S. in naval architecture and marine engineering from the University of Michigan in 1977. He is a member of USNI and the Association of Scientists and Engineers at NavSea. Richard Carlstrom:is a naval architect with Advanced Marine Enterprises. He has been responsible for software development in support of a variety of major programs including FCCS and SHCP and is a specialist in stability evaluations for complex ships such as CVs CVNs

The Flooding Casualty Control Software (FCCS) was developed under the auspices of the Naval Sea Systems Command (NavSea) and is currently being deployed on a variety of ships in the neets of both the U.S. Navy and the U.S. Coast Guard. The primary objective of FCCS is to enable damage control personnel to identify critical stability conditions, especially when related to the loss of reserve buoyancy due to battle damage and the destabilizing effects of large quantities of firefighting water, in a timely manner. FCCS was initially deploved in 1990. It utilizes the standard algorithms of the Ship Hull Characteristics Program (SHCP). The user interface was designed to allow quick familiarity for shipboard users, primarily the damage control assistant (DCA) and his staff. Intact stability evaluations include the effects of topside icing, high winds, personnel crowding, heavy lifts over the side, high speed turns, and towing. FCCS also supports ballasting analysis for amphibious ships as well as providing bottom reaction and beached stability data for grounding incidents. Bv providing a tool for the ''fuel king'' and DCA to generate the required daily updates on the current ship load and liquids status, FCCS is assured of an accurate baseline in the event of damage. The design allows the evaluation of the ultimate ship stability status for a damage event using simple compartmentation and flooding status inputs. Evaluation of the adequacy of resulting stabilitv, as well as identification of such critical stability parameters as off center loading, margin line immersion, and negative GM, are accomplished by the program. Guidance is provided for the user to initiate appropriate flooding related damage control activities. Initially fitted on USS Oliver Hazard Perry Class frigates, FCCS databases have been for the USCG Hamilton class high endurance cutters, USS Arleigh Burke class Aegis destroyers, and a variety of other U.S. Navy and U.S. Coast Guard ship classes. The progra

关键词：

来源：评论

学校读者我要写书评

暂无评论

A new method for reduction of current and voltage harmonic distortion in power systems

引用

European Transactions on Electrical Power 1993年第1期3卷 85-89页

作者： Mikolajuk, K. Tobola, A. Prof. Kazimierz Mikolajuk (1941) is head of the Institute of the Theory of Electrical Engineering and Electrical Measurements Warsaw University of Technology Poland. He received the M. Sc. Ph. D. and D. Sc. degrees from Warsaw University of Technology in 1963 1972 and 1977 respectively all in electrical engineering. His current research interests include the theory of non-linear circuits synthesis of power electronic circuits and harmonic power compensators. (Warsaw University of Technology Institute of Electrical Theory and Measurements Koszykowa 75 PL-00-66 1 Warsawl Poland T +482/628 45 68 Fax + 482/29 29 62) Dipl.-Ing. Andrzej Tobola (1956) received his M. Sc. degree from Warsaw University of Technology Poland in 1980. He is currently working for the Ph. D. degree. Since 1984 he is working as assistant at the department of Electrical Engineering Warsaw University of Technology. His scientific works are concentrating around computer aided design of power electronic circuits and numerical methods in electrical engineering. (Warsaw University of Technology Institute of Electrical Theory and Measurements Koszykowa 75 PL-00-661 Warsaw/Poland T +4822/400071-263 Fax +48 22/29 29 62)

The paper shows that it is possible to design such a switched 1 ‐port which ‐ excited by a sinusoidal voltage ‐draws desired current harmonics. The circuit switched twice within a period can generate odd current harmonics and the circuit switched once within a period generates even harmonics. This new kind of compensator has advantages of active filters such as good compensation characteristics. On the other hand it is easier to realize a large VA compensator based on the presented idea than to realize a high switching frequency static power compensator. Most established active and hybrid filters are based on a load current measurement. The compensator presented in the paper can be used to eliminate current distortion as well as voltage distortion. The two‐step optimization with the use of the harmonic voltage measurement allows to eliminate harmonic voltage. The results of numerical simulation and experimental results are presented. Copyright © 1993 John Wiley & Sons, Ltd.

关键词：

来源：评论

学校读者我要写书评

暂无评论

INVESTIGATIONS ON CHIP-INTERNAL CURRENT CONTRAST IMAGING AND MEASUREMENT USING AN ELECTRON-BEAM TESTER

引用

MICROELECTRONIC ENGINEERING 1992年第1-4期16卷 173-182页

作者： HELMREICH, K NAGEL, P WOLZ, W MULLERGLASER, KD University of Erlangen-Nürnberg Institute of Computer Aided Circuit Design Wetterkreuz 13 8520 Erlangen Germany

Electron beam testers today have become an important tool for fault localization in integrated circuits. However, they allow for the measurement of chip-internal voltage signals only, whereas, in many cases, measurement access to chip-internal current signals would speed up the debug process a lot. Until now, no technique has been introduced that enables current measurements by means of an electron beam tester. The paper discusses different approaches for measuring currents with the electron beam probe. A completely novel imaging and measurement technique giving access to chip-internal current signals is proposed. The generic effects are discussed and calculated analytically. Numerical calculations for realistic measurement situations are presented as well as the results of first experimental investigations.

关键词： Electron Beams

来源：评论

学校读者我要写书评

暂无评论

COMPUTATIONAL ASPECTS OF THE SPLITTING METHOD FOR INCOMPRESSIBLE-FLOW WITH A FREE-SURFACE

引用

computerS & FLUIDS 1992年第3期21卷 345-353页

作者： GUSHCHIN, VA KONSHIN, VN Institute of Computer Aided Design Russian Academy of Sciences 19/18 2nd Brestskaja str. Moscow 123865 Russia

An efficient numerical method is proposed to obtain solutions of high accuracy in the vicinity of a free surface or in domains where there are large gradients in the hydrodynamic flow parameters. The aim of the present paper is to develop a new numerical method and use it to investigate both stationary and non-stationary wave motions of a liquid.

关键词：

来源：评论

学校读者我要写书评

暂无评论

GENERALIZED RADIOSITY METHOD FOR ENVIRONMENTS WITH CURVED SURFACES

引用

Progress in Natural Science:Materials International 1992年第5期 425-437页

作者：朱一宁彭群生 PRC State Key Laboratory of Computer Aided Design and Computer Graphics Zhejiang University Hangzhou 310027

A generalized radiosity method based on the theory of light energy transfer between two differentialdiffuse surface areas is *** the conventional one,our method assumes radiosity tobe variable with each surface *** limiting the unknowns to radiosities of differential surface areaslocated at all vertices of surface patches,we have established a complete set of approximated *** generalized radiosity equation has been extended to non-diffuse *** and experimental results demonstrate the great potential of this method.

关键词： realistic image synthesis radiosity complex general environment

来源：评论

学校读者我要写书评

暂无评论

DRC-BASED SELECTION OF OPTIMAL PROBING POINTS FOR CHIP-INTERNAL MEASUREMENTS

DRC-BASED SELECTION OF OPTIMAL PROBING POINTS FOR CHIP-INTER...

引用

1992 INTERNATIONAL TEST CONF ON DISCOVER THE NEW WORLD OF TEST AND design

作者： SCHARF, R KUNTZSCH, C HELMREICH, K WOLZ, W MULLERGLASER, KD University of Erlangen-Numberg Institute of Computer-Aided Circuit Design Wetterkreuz 13 Erlangen D-W8520 Germany

ISBN: (纸本)0780307607

This paper introduces a new method for the selection of optinuxl probing points in chip-internal e-beam testing by applying a set ofprobingpoint selection rules to the complete area of the desired wire. Conznzvrcially available design rule check (DRC) tools are used to perform the required topological operations. For easy adaption to different technologies, a rule definition language hus been developed to allow forthedefinition ofrules independent of the utilized DRCtool. Theyrobingpointselection is such thut loculfield eflects, crosstalk and circuit structure influences are nzininzized. © 1992 IEEE.

关键词： Area measurement Circuit synthesis Circuit testing Crosstalk Electron beams Guidelines Integrated circuit measurements Passivation Semiconductor device measurement Wire

来源：评论

学校读者我要写书评

暂无评论

KINEMATIC ANALYSIS AND SYNTHESIS OF MECHANISMS VIA SMALL-SCALE INTERFERENCE DETECTION

KINEMATIC ANALYSIS AND SYNTHESIS OF MECHANISMS VIA SMALL-SCA...

引用

1992 AAAI Fall Symposium on design from Physical Principles

作者： Gupta, Rakesh Jakiela, Mark J. Computer Aided Design Laboratory Massachusetts Institute of Technology Department of Mechanical Engineering CambridgeMA02139 United States

A methodto simulate the interactions between objects of a mechanismis described. The method can simulate planar kinematic chains of any length. The same methodis used with modifications to generate the geometry of one object of a kinematic pair given the required functional relationship and the geometry of the other object. The planar contour shape of each object of a kinematic pair is represented as an arrangement of very small entities called molecules. Given the motion of the driver, the motion of the other object of the pair, knownas the driven, is determined by global constraints and the prevention of geometric interference among the molecules of both *** molecular representation allows very detailed changes in the shapes of the members. This facilitates automatic optimal shape design and very generalized kinematic analysis and synthesis. A computer implementation, intended to be used in the future with higher-level intelligent processing, is described and examplesare provided. © 1992, AAAI (***). All rights reserved.

关键词： Molecules

来源：评论

学校读者我要写书评

暂无评论

Layout analysis and automatic test point selection for fast prototype debug using E-beam or laser-beam testsystems

Layout analysis and automatic test point selection for fast ...

引用

14th Annual Custom Integrated Circuits Conference, CICC 1992

作者： Scharf, R. Kuntzsch, C. Helmreich, K. Wolz, W. Müller-Glaser, K.D. University of Erlangen-Nürnberg Institute of Computer Aided Circuit Design Wetterkreuz 13 D-W8520 Erlangen Germany

ISBN: (纸本)078030246X

This paper introduces a novel approach for mapping netnames to layout elements without using layout-versus-schematic tools. Using this technique, a program has been developed that analyzes layouts, computes an observability degree for electron or laser beam testing, detects unobservable nets, and automatically selects probing points for chip-internal measurement. Shortened execution times and applicability to incomplete layout data are the main advantages over layout-versus-schematic based techniques. © 1992 IEEE.

关键词： Laser beams

来源：评论

学校读者我要写书评

暂无评论

Cellular neural network design with continuous signals 2

Cellular neural network design with continuous signals

引用

2nd International Workshop on Cellular Neural Networks and their Applications, CNNA 1992

作者： Schwarz, Stephan Mathis, Wolfgang University of Wuppertal Department of Electrical Engineering Institute for Computer Aided Circuit Design Fuhlrottstrafie 10 Wuppertal 1D-5600 Germany

ISBN: (纸本)0780308751

In this paper are indioduced basic design methods for the class of cellular neural networks (CNN' s) with continuous input signals. The realistic Modell of CNN' s are proposed by Chua and Yang [2, 3] and combine components of the Hopfield-Net [8], the Cellular Automatas [13] und der Cellular Systems [14]. The CNN design methods integrate special conditions for technical architectures with respect to realtime implementations. Hacijan's polynomial solution method [5] are applied to solve the set of linear inequalities which correspond with the CNN design. © 1992 IEEE.

关键词： Cellular neural networks

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：