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International conference and Workshop on engineering of Computer-Based Systems

作者： R.R. Kampfner Computer and Information Science Department School of Engineering University of Michigan Dearborn Dearborn MI USA

The view of processing as an integral part of function suggests that information systems must be embedded into the structure and dynamics of the functions they support. This requires that the architecture of the computer-based information system be compatible with the structure and dynamics of the organization it supports. In this paper we propose a model-based approach to the development of information systems that uses models of the structure and dynamics of organizations in order to develop effective function support. The proposed approach uses a conceptual tool to model key features of the structure and dynamics of the organization and a methodology that maps such features into the architecture of its supporting information system. A modeling and simulation environment is suggested that includes an extensive model base that can be used for the simulation and analysis of organizational function in addition to its use in systems development.

关键词： Information systems Computer architecture Computational modeling Analytical models Information processing Context modeling Management information systems Embedded computing Information science Biology computing

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Real-time job scheduling in hypercube systems

Real-time job scheduling in hypercube systems

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International conference on Parallel Processing (ICPP)

作者： O-Hoon Kwon Jong Kim SungJe Hong Sunggu Lee Department of Computer Science and Engineering Pohang University of Science and Technology Pohang South Korea Department of Electronic and Electrical Engineering Pohang University of Science and Technology Pohang South Korea

ISBN: (纸本)081868108X

In this paper, we present the problem of scheduling real-time jobs in a hypercube system and propose a scheduling algorithm. The goals of the proposed scheduling algorithm are to determine whether all jobs can complete their processing before their fixed deadlines in a hypercube system and to find such a schedule. Each job is associated with a computation time, a deadline, and a dimensional requirement. Determining a schedule such that all jobs meet before their respective fixed deadlines in a hypercube system when preemption is not allowed is an NP-complete problem. Hence, we present a heuristic scheduling algorithm for scheduling non-preemptable real-time jobs in a hypercube system. Finally, we evaluate the proposed algorithm using simulation.

关键词： Real time systems Hypercubes Processor scheduling Scheduling algorithm Computer science NP-complete problem Parallel architectures Scalability Topology Resource management

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A three-level finite difference beam propagation formulation

A three-level finite difference beam propagation formulation

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Asia-Pacific conference on Microwave

作者： Kwang-Kuen Park Hosung Chang Department of Radio Science and Engineering Hanyang University Seoul South Korea

ISBN: (纸本)962442117X

The authors consider beam propagation in a linear and lossless parallel dielectric waveguide, extending the Crank-Nicholson method to a three-level finite difference scheme based on the Helmholtz wave equation. Stability analysis indicates that the three-level scheme is stable with small oscillatory behavior. However, simulation results exhibit conditional stability and the bigger the propagation step size, the more oscillation results.

关键词： Finite difference methods Partial differential equations Dielectric losses Difference equations Propagation constant Propagation losses Refractive index Arithmetic Boundary conditions Taylor series

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A comparative study of five regression testing algorithms

A comparative study of five regression testing algorithms

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Australian conference on Software engineering

作者： G. Baradhi N. Mansour Computer Science Lebanese American University USA

We compare five regression testing algorithms that include: slicing, incremental, firewall, genetic and simulated annealing algorithms. The comparison is based on the following ten quantitative and qualitative criteria: execution time, number of selected retests, precision, inclusiveness, user parameters, handling of global variables, type of maintenance, type of testing, level of testing, and type of approach. The experimental results show that the five algorithms are suitable for different requirements of regression testing. Nevertheless, the incremental algorithm shows more favorable properties than the others.

关键词： Testing Genetics Simulated annealing Computer science Computational modeling Computer simulation Software maintenance Partitioning algorithms Data analysis Linear programming

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VHDL extensions for complex transmission line simulation 97

VHDL extensions for complex transmission line simulation

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European Design and Test (ED&TC) conference

作者： P. Walker S. Ghosh Division of Engineering Brown University Providence RI USA Computer Science Department Arizona State University Tempe AZ USA

ISBN: (纸本)9780818677861

This paper proposes extensions to the VHDL grammar and defines new semantics in the language to model the timing behavior of high frequency buses and clock lines with multiple, distinct taps in a VHDL description. The proposed language constructs utilize transmission line analysis to model the timing behavior but avoids the continuous time simulation by using line-events.

关键词： Timing Transmission lines Conductors Clocks Circuit simulation Discrete event simulation Delay effects Propagation delay Hardware Space vector pulse width modulation

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Texture evolution during deep drawing of copper sheet

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SCRIPTA MATERIALIA 1997年第9期36卷 1023-1029页

作者： Li, SY Zhang, XM Department of Materials Science and Engineering Central South University of Technology Changsha 410083 P. R. China

References 1. G.E.G. Tucker. Acta Metall. 9 (1961), p. 275. Abstract | PDF (1232 K) | View Record in Scopus | Cited By in Scopus (29) 2. H. Inagaki. Z. Metallk. 82 (1991), p. 361. View Record in Scopus | Cited By in Scopus (14) 3. F. Barlat, K. Chung and O. Richmond. Metall. Trans. A 25A (1994), p. 1209. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (0) 4. K.C. Chan. Scripta Metall. Mater. 32 (1995), p. 229. Article | PDF (292 K) | View Record in Scopus | Cited By in Scopus (3) 5. S.Y. Li, X.M. Zhang and G. Gottstein. In: Z. Liang, L. Zuo and Y. Chu, Editors, Proc. 11th Int. Conf. on Textures of Materials (ICOTOM-11), International Academic Publishers, Beijing (1996), p. 805. 6. S.Y. Li and X.M. Zhang. In: Z. Yu, Z. Xiao and X. Xie, Editors, proceedings of the International conference on Modelling and simulation in Metallurgical engineering and Materials science (MSMM'96), The Metallurgical Industry Press, Beijing (1996), p. 609. 7. W. Dabrowski, J. Karp and H.-J. Bunge. Arch. Eisenhüttenwes. 53 (1982), p. 361. View Record in Scopus | Cited By in Scopus (2) 8. D. Daniel, J. Savoie and J.J. Jonas. Acta Metall. Mater. 41 (1993), p. 1907. 9. J. Kusnierz, M. Gasperini, A. Mokhtari, M. Pernot and R. Penelle. In: C.M. Brakman, P. Jongenburger and E.J. Mittemeijer, Editors, ICOTOM-7, Noordwijkerhout, The Netherlands (1984), p. 509. View Record in Scopus | Cited By in Scopus (0) 10. J. Kusnierz. Arch. Metall. 33 (1988), p. 179. 11. S. Saimoto, P. Van Houtte, D. Reesor and P. Clarke. Textures and Microstructures 14–18 (1991), p. 1233. Full Text via CrossRef 12. C. Peyrac and R. Penelle. Mém. Sci. Rev. Mét. 89 (1992), p. 270. 13. R.J. Asaro and A. Needleman. Acta Metall. 33 (1985), p. 923. Abstract | PDF (3227 K) | View Record in Scopus | Cited By in Scopus (368) 14. P. Gilormini, L.S. Toth and J.J. Jonas. In: (6th ed.),Proc. R. Soc. Lond. A. 430 (1990), p. 489. Full Text via CrossRef 15. J. Savoie and J.J. Jonas. Acta Metall. Mater. 42

关键词： Textures

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A cost-model-based online method for distributed caching

A cost-model-based online method for distributed caching

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International conference on Data engineering

作者： M. Sinnwell G. Weikum Department of Computer Science University of Saarland Saarbrucken Germany

Presents a method for distributed caching to exploit the aggregate memory of networks of workstations in data-intensive applications. In contrast to prior work, the approach is based on a detailed cost model as the basis for optimizing the placement of variable-size data objects in a distributed, possibly heterogeneous two-level storage hierarchy. To address the online problem with a priori unknown and evolving workload parameters, the method employs dynamic load tracking procedures and an approximative, low-overhead version of the cost model for continuous reoptimization steps that are embedded in the decisions of the underlying local cache managers. The method is able to automatically find a good tradeoff between an "egoistic" and an "altruistic" behavior of the network nodes, and proves its practical viability in a detailed simulation study under a variety of workload and system configurations.

关键词： Cost function Web server Workstations Aggregates Mathematical model Computer science World Wide Web Optimization methods Computational modeling Computer simulation

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Multimode fuzzy-CMAC intelligent controller

Multimode fuzzy-CMAC intelligent controller

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American Control conference (ACC)

作者： Guo Chen D.P. Kwok Sun Zengqi Yu Jingzhe Department of Automatic Control Dalian Maritime University Dalian China Department of Electronic Engineering Hong Kong Polytechnic University Hung Hom China Department of Computer Science and Engineering Tsinghua University Beijing China

Proposes a combined controller structure and algorithm which integrates a cerebellar model articulation controller (CMAC) with fuzzy logic and bang-bang control under an intelligent supervisor. This neuro-fuzzy controller has self-learning ability in real-time and can readily be applied to industrial process plants. The numerical results of simulation studies, which demonstrate the benefit and feasibility of the proposed algorithm, are presented.

关键词： Control systems Automatic control Fuzzy logic Force control Intelligent structures Neural networks Optimal control Bang-bang control Process control Steady-state

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Modelling an autonomous wind-diesel system using SIMULINK

Modelling an autonomous wind-diesel system using SIMULINK

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Canadian conference on Electrical and Computer engineering (CCECE)

作者： A. Tomilson J. Quaicoe R. Gosine M. Hinchey N. Bose Faculty of Engineering & Applied Science Memorial University of Newfoundland Saint John's NEW Canada

In this paper, a nonlinear dynamic model of the experimental wind-diesel system at the Atlantic Wind Test Site (AWTS) is developed and simulated using the MATLAB and SIMULINK software packages. The model is validated ... 详细信息

关键词： Mathematical model Wind energy generation Diesel engines Nonlinear dynamical systems Power system modeling Power generation Wind energy Testing Software packages Costs

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Synchronous load balancing in hypercube multicomputers with faulty nodes

Synchronous load balancing in hypercube multicomputers with ...

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International conference on Parallel and Distributed Systems (ICPADS)

作者： Jaewon Seo Sunggu Lee Jong Kim Department of Electrical Engineering Information Research Laboratories PIRL Pohang University of Science and Technology Pohang South Korea IBM Thomas J. Watson Research Center Yorktown Heights NY USA Department of Computer Science & Engineering Information Research Laboratories PIRL Pohang University of Science and Technology Pohang South Korea

ISBN: (纸本)0818682272

This paper presents a new dynamic load balancing algorithm for hypercube multicomputers with faulty nodes. The emphasis in our method is on obtaining global load information and performing task migration using "short paths" in a synchronous manner so that a minimal amount of communication overhead is required. To accomplish this, we present an algorithm for constructing a new logical topology from a hypercube topology with faulty nodes. This new topology is used to obtain the global load information and to perform task migration. simulation results are used to evaluate the performance of our dynamic load balancing method. The proposed strategy shows good performance in the case of a small number of faulty nodes when compared with previous methods.

关键词： Load management Hypercubes Topology Concurrent computing Distributed computing Application software Heuristic algorithms Parallel processing Computer networks Multiprocessor interconnection networks

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