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Static allocation in distributed objectbase systems: A graphical approach 6th

6th International Conference on Information systems and Management of Data, CISMOD 1995

作者： Bhar, Subhrajyoti Barker, Ken Advanced Database Systems Laboratory Department of Computer Science University of Manitoba WinnipegR3T 2N2 Canada

ISBN: (纸本)3540605843

In recent years, object oriented (OO) models have emerged as preferred data models for a wide range of application domains. This is primarily due to the capability of the OO-models to manage and represent information of any arbitrary complexity. Distributed Objectbase systems (DOBS) combines the benefit of distributed processing and the power of manipulation and abstraction of complex information to provide a powerful environment for distributed computing that is not available in conventional distributed database systems. Application performance and processing cost in a DOBS are greatly influenced by communication overhead involved in accessing nonlocal data and making remote method invocations. Efficient distribution design is mandatory to ensure optimal performance of the distributed system at minimum cost. Distribution design in DOBS involves fragmentation of the objectbase and allocation of the resulting class fragments between the nodes of the network. We adopt a top-down approach for the distribution design for a DOBS and assume that the global conceptual schema is partitioned into a set of class fragments. We focus our attention to optimal allocation of the fragments between the sites of the network subject to a set of constraints. Our entity of allocation is a class fragment. The allocation scheme defines the local conceptual schema at every site. The problem of allocation has been addressed for distributed file systems (DFS) and distributed (relational) database systems (DDBS). The additional complexity introduced by the object model has only recently been investigated with no result appearing that address the specific problem of allocation. This paper addresses the problem of object allocation in DOBS. A general allocation taxonomy is defined based on data model, degree of redundancy and design objective, and different allocation models are classified based on this taxonomy. An allocation model for DOBS is formulated and an algorithm is presented for stati

关键词： Taxonomies

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Stability analysis for a family of space one dimensional convection diffusion difference schemes

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Japan Journal of Industrial and Applied Mathematics 1995年第1期12卷 1-28页

作者： Nagoya, Seiichiro Ushijima, Teruo Department of Computer Science and Information Mathematics The University of Electro-Communications Chofu-shi Tokyo 182 1-5-1 Chofugaoka Japan ARK Information Systems Inc. Chiyoda-ku Tokyo 102 Toupure Bldg. 4-2 Gobancho Japan

This paper concerns the L2-stability analysis for a family of finite difference schemes for the initial value problem of space 1 dimensional linear constant coefficient convection diffusion equation. The space differe... 详细信息

This paper concerns the L²-stability analysis for a family of finite difference schemes for the initial value problem of space 1 dimensional linear constant coefficient convection diffusion equation. The space difference operators of the schemes have the order of accuracy greater than or equal to 2. In this paper we say that the scheme satisfies the von Neumann condition if the maximum of the absolute value of the amplification coefficient of the scheme is less than or equal to 1. The problem is to characterize, in terms of the space mesh and the time mesh, the scheme which satisfies the von Neumann condition. To investigate the toughness of the scheme in the computation of the modes in a range of relatively shorter wave length in the relevant discrete problem, the concept of ε-stability is introduced, and characterized in this paper. The principal aim of the paper is to give the proof of the characterization. © 1995 JJIAM Publishing Committee.

关键词： ε-stability convection diffusion equation five point upwinding difference operator von Neumann condition

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probabilistic and deterministic local search for solving the binary multiknapsack problem*

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Optimization 1995年第2期33卷 155-166页

作者： Bertocchi, M. Butti, A. Slominski, L. Sobczynska, J. Department of Mathematics Statistics and Computer Science University of Bergamo Bergamo Piazza Rosate 2 Italy Mathematical Programming Department Systems Research Institute Polish Academy of Sciences Warsaw Newelska str 6 Poland

Results of extensive computational experiments aimed at comparing performance quality (accuracy of an approximate solution and the running time) of the Threshold Accept (TA) approach versus the Simulated Annealing (SA) and a Greedy-Local improvement Search (GLS) approaches are presented. This comparison is done on a large set of test examples that represent the binary Multiknapsack Problem (MKP). It appears that the best accuracy results are obtained for the TA algorithm. Purely deterministic search is only slightly worse in accuracy, but remarkably better in the running time, comparing to both SA and TA. © 1995 Taylor & Francis Group, LLC

关键词： Deterministic greedy-local type search Multiknapsack problem Simulated annealing and threshold accept algorithms

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The multi-weighted spanning tree problem 1st

The multi-weighted spanning tree problem

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1st Annual International Computing and Combinatorics Conference, COCOON 1995

作者： Ganley, Joseph L. Golin, Mordecai J. Salowe, Jeffrey S. Cadence Design Systems Inc 555 River Oaks Parkway Building 2 MS 2A2 San JoseCA95134 United States Department of Computer Science Hong Kong UST Clear Water Bay Kowloon Hong Kong QuesTech Inc 7600A Leesburg Pike Falls ChurchVA2204 United States

Consider a graph in which each edge is associated with q weights. In this paper we discuss different aspects of the problem of minimizing the minimum-spanning-tree cost simultaneously with respect to the different wei... 详细信息

ISBN: (纸本)354060216X

关键词： computers

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EDITORIAL

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International Journal of Pattern Recognition and Artificial Intelligence 1995年第4期9卷 599-600页

作者： L. S. DAVIS K. INOUE M. NIVAT A. ROSENFELD P.S.P. WANG Institute for Advance Computer Studies University of Maryland College Park Maryland 20742-3251 USA Department of Computer Science and Systems Engineering Faculty of Engineering Yamaguchi University Ube 755 Japan Universite Paris VII L.I.T.P. Institut Blaise Pascal 2 Place Jussieu Paris Cedex France Center for Automation Research University of Maryland College Park Maryland 20742-3275 USA College of Computer Science Northeastern University Boston USA

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CONCURRENT LARGE-SIGNAL SIMULATION OF AN ACTIVE MICROSTRIP ANTENNA

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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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Steady‐state security evaluation of electrical power systems by means of artificial neural network

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European Transactions on Electrical Power 1995年第2期5卷 91-97页

作者： Chiodo, E. Menniti, D. Testa, A. Picardi, C. Elio Chiodo (1959) received the degree in Electronics Engineering in 1985 and the Ph.D. degree in Computational Statistics both from the University of Naplefltaly. He is a Researcher at the Department of Electrical Engineering of the University of Naples and a member of the Italian Statistical Society. His areas of interest include probabilistic methods applied to electric power systems analysis. (University of Naples Fedrrico 11. Electrical Engineering Dept.via Claudio 21 1-80125 Naplefltaly T +3981/7683226 Fax+3981/2396897) Daniele Menniti (1958) received the degree in Electrical Engineering from the University of Calabria. Cosenzataly and the Ph.D. degree in Electrical Engineering from the University of NapleslItaly in 1984 and 1989 respectively. He is a researcher at the Electronic. Computer and Systems Science Department of the University of Calabria. Italy. Hiscurrent research interests concern electric power system analysis real-time control and automation. (University of Calabria Electronic Computer and Systems Science Dep. Arcavacataji Rende (CS). 1-87036 CosenzdItaly T +39984/494707. Fax +39984/4947 13) Alfredo Testa (1950) received the degree in Electrical Engineering from the University of Naples/Italy in 1975. He is an Associate Professor in Electrical Power Systems at the Department of Electrical Engineering of the University of Naples. He is engaged in researches on electrical power systems reliability and harmonic analysis. (University of Naples Federico 11. Electrical Engineering Dep. via Claudio '2 1 1-80 I25 NapleslItaly T + 39 8 I/7 68 3'2 11. Fax+3981/2396897) Ciro Picardi (1949) received the degree in Electronics Engineering from the University of Naples/Italy in 1975. He is currently Associate Professor in Process Control at the Department of Electronic Computer and System Science of the University of Calabria. Italy. His current research interests are in the area of electrical drives robotics neural networks and fuzzy control. (University of Calabria Electronic. Compu

An artificial‐neural‐network (ANN) application for steady‐state security evaluation of electrical power systems is presented. Such application is based upon a combined use of a multilayer back‐propagation neural network and of an opportune electrical system model, previously proposed by some of the authors. In the paper, the definition of steady‐state security and the problems arising from its on‐line evaluation are briefly recalled. Then, the ANN utilized is described with particular reference to the solutions adopted by the authors. Afterwards, some remarks on the system model utilized are reported. Finally, numerical applications on the AEP‐14 bus system are presented and the results obtained with different ANN configurations are analyzed. Copyright © 1995 John Wiley & Sons, Ltd.

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EXCEPTION HANDLING - EXPECTING THE UNEXPECTED

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computer LANGUAGES 1994年第2期20卷 69-87页

作者： DREW, SJ GOUGH, KJ Programming Languages and Systems Group Computer Science Department Queensland University of Technology Queensland Australia 4000

Since the mid-1970s, and with the development of each new programming paradigm there has been an increasing interest in exceptions and the benefits of exception handling. With the move towards programming for ever more complex architectures, understanding basic facilities such as exception handling as an aid to improving program reliability, robustness and comprehensibility has become much more important. Interest has sparked the production of many papers both theoretical and practical, each giving a view of exceptions and exception handling from a different standpoint. In an effort to provide a means of classifying exception handling models which may be encountered, a taxonomy is presented in this paper. As the taxonomy is developed some of the concepts of exception handling are introduced and discussed. The taxonomy is applied to a number of exception handling models in some contemporary programming languages and some observations and conclusions offered.

关键词： EXCEPTIONS EXCEPTION HANDLING programming LANGUAGES

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REQUIREMENTS FOR PARALLEL programming IN OBJECT-ORIENTED DISTRIBUTED systems

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computer JOURNAL 1994年第6期37卷 499-508页

作者： TANGNEY, B CONDON, A CAHILL, V HARRIS, N Distributed Systems Group Department of Computer Science Trinity College Dublin 2 Ireland

In this paper we present some ideas on the functionality that should be incorporated into an object-oriented distributed system to support distributed and parallel programming. The work is based on practical experience in developing several substantial distributed and parallel applications on the Amadeus platform. Related work in the area is sketched.

关键词： computer programming

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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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