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conference on Enabling Technology for simulation science

作者： Hu, JQ Boston Univ. (United States)

ISBN: (纸本)0819424986

By using the event synchronization scheme, we develop a new method for parallel simulation of many discrete event dynamic systems concurrently. Though a few concurrent simulation methods have been developed during the last several years, such as the well-known Standard Clock method, most of them are largely limited to Markovian systems. The main advantage of our method is its applicability to non-Markovian systems, For Markovian systems a comparison study on efficiency between our method and the Standard Clock method is done on Connection Machine CM-5. CM-5 is a parallel machine with both SIMD (Single Instruction, Multiple Data) and MIMD (Multiple Instruction, Multiple Data) architectures. The simulation results show that if event rates of Markovian systems do not differ by much then both methods are compatible but the Standard Clock method performs better in most cases. For Markovian systems with very different event rates, our method often yields better results. Most importantly, our simulation results also show that our method works as efficiently for non-Markovian systems as for Markovian systems.

关键词： discrete event simulation parallel simulation event synchronization

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Computer simulation of `order-order' kinetics in L12 superstructure

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Materials science and engineering A 1997年第1-2期239-240卷 777-783页

作者： Oramus, P. Kozubski, R. Cadeville, M.C. Pierron-Bohnes, V. Pfeiler, W. Jagellonian Univ Krakow Poland

Monte Carlo simulations of `order-order' relaxations in AB3 systems with L12 superstructure were carried out assuming vacancy mechanism of atomic jumps with constant atomic pair-interaction energy parameters and the saddle-point energies assigned to jumping atoms. The study was focused on relaxations following an increase of temperature. The simulated long-range order (LRO) relaxation curves fitted weighted sums of two exponentials strongly differing in relaxation times, the longer ones of which obeyed the Arrhenius law. The contribution (weight) of the fast process was gradually reduced when the activation barrier energy for B-atom jumps was increased in relation to that for A-atoms. It was found out that the initial stages of LRO relaxations were dominated by A-atom jumps between different sublattices. In conclusion, it is proposed that the fast component of the disordering relaxations in L12 superstructure is due to highly correlated pairs of A-atom and B-atom jumps, which occur provided the majority B-atoms are sufficiently mobile.

关键词： Intermetallics

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Workshop on International conference on Software engineering, ICSE 1997 and Software Configuration Management, SCM 1997

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International conference on Software engineering, ICSE 1997 and 7th Workshop on Software Configuration Management, SCM 1997

ISBN: (纸本)3540630147

The proceedings contain 16 papers. The special focus in this conference is on Versioning Models, Reuse and System Models. The topics include: Towards a uniform version model for software configuration management;comparing implementations of change-based SCM;constructing a large product with jam;versioning and consistency for dynamically composed configurations;managing the software development process with clearguide;high level process modeling for SCM systems;distributed source control system;a distributed software configuration management environment on X.500;supporting cooperative work;supporting distributed configuration management in virtual enterprises;distributed configuration management via java and the world wide web;product management requirements for SCM discipline;a case-study of configuration management with clearcase in an industrial environment and experience with change-oriented SCM tools.

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Hierarchical sequence compaction for power estimation 97

Hierarchical sequence compaction for power estimation

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34th Design Automation conference

作者： Marculescu, R Marculescu, D Pedram, M Department of Electrical Engineering Systems University of Southern California Los Angeles CA

ISBN: (纸本)0897919203

This paper presents an effective technique for compacting a large sequence of input vectors into a much smaller one such that when the two sequences are applied to any circuit, the resulting power dissipations are nearly the same. Specifically, this paper introduces the hierarchical modeling of Markov chains as a flexible framework for capturing not only complex spatiotemporal correlations, but also dynamic changes in the characteristics of the input sequence, The new framework has a high degree of adaptability, i.e. the hierarchical model is dynamically grown according to the sequence behavior, Experimental results demonstrate that large compaction ratios can be obtained without a significant loss in accuracy (less than 5% on average) of power estimates.

关键词： Computer simulation

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Resolving conflicts with committing transactions in distributed real-time databases 3

Resolving conflicts with committing transactions in distribu...

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3rd IEEE International conference on engineering of Complex Computer Systems (ICECCS 97)

作者： Lam, KY Cao, JN Pang, CL Son, SH Department of Computer Science City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong Department of Computer Science University of Virginia Charlottesville 22903 VA United States

ISBN: (纸本)0818681268

In a distributed real-time database system, if data conflicts occur between executing and committing transactions the performance can be severely affected. In this paper, we propose an approach, called deadline driven conflict resolution (DDCR), which integrates concurrency control and commitment management in resolving data conflicts between executing and committing transactions, while at the same time maintaining the schedules to be serializable. With DDCR, many of the data conflicts can be alleviated, and concurrent execution of transactions is allowed to access data items being held by committing transactions. The impact of temporary failures occurred during the commitment of a transaction an other transactions is reduced by reversing the dependencies between the transactions. simulation experiments have been performed and the results show that DDCR can significantly improve the system performance especially when the duration for the voting phase is long.

关键词： Concurrency control

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Performance analysis of localization algorithms

Performance analysis of localization algorithms

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1997 IEEE International conference on Robotics and Automation (ICRA97) - Teaming to Make an Impact

作者： Chu, YX Gou, JB Kang, B Woo, KT Li, ZX Department of Electrical and Electronic Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

ISBN: (纸本)0780336135

Workpiece localization, with novel applications such as workpiece setup, refixturing and dimensional inspections, is a problem of permanent importance in manufacturing. Using the popular least square formulation, several geometric algorithms have been developed for workpiece localization over the last few years. In this paper, we analyze and compare the performance of three localization algorithms based on the following criteria: (a) robustness with respect to variations in initial conditions;(b) accuracy of computed results;and (c) computational efficiency. We develop an approach for improving the robustness of the algorithms for workpieces with sculptured surfaces for which region of convergence is typically small. Based on simulation results, we also discuss sensitivity of the algorithms with respect to the number of measurement points and give a lower bound on this number for recovering a Euclidean transformation with certain accuracy.

关键词： Computer aided manufacturing

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A new approach to object oriented simulation of concurrent systems

A new approach to object oriented simulation of concurrent s...

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conference on Enabling Technology for simulation science

作者： Pears, AN Singh, S Dillon, TS La Trobe University Bundoora Melbourne Vic. 3083 Australia

ISBN: (纸本)0819424986

High speed simulation of concurrent systems requires distributed processing if meaningful results are to be obtained for large systems in a reasonable timeframe. One of the most common methods used for such simulation is Parallel Discrete Event simulation (PDES). A range of PDES simulation kernels have been developed and much research has been devoted to optimistic execution strategies such as TimeWarp. Unfortunately in all this effort some fundamental aspects of object oriented modelling for simulation have received scant attention. In particular the ability of simulation kernels to act on truly generic simulation objects. In this context we define a truly generic object to be one which totally defines its responeses to external stimuli, but which has no concept of its place in the interconnected web of objects that comprise the total simulation environment. To address this problem, we propose a new modelling approach based on interacting objects, and an associated simulation kernel architecture. This paper describes the architecture and features of our simulation kernel in detail, and demonstrates, using a small example, the benefits of adopting such a modelling approach. The major specific benefits include true object genericity, enhanced scope for object re-use, and enhanced opportunities to use polymorphism.

关键词： object-oriented simulator generic distributed kernel parallel and distributed systems

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Design and model for a computer supported cooperative environment for CASE arid CAD applications 35

Design and model for a computer supported cooperative enviro...

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35th ACM Annual Southeast Regional conference, ACM-SE 1997

作者： Chang, Kai H. Murphy, Liam Lee, Byong G. Dollar, Tim Chang, Yifang Fouss, Jonathan Department of Computer Science and Engineering Auburn University AuburnAL38849-5347 United States

ISBN: (纸本)0897919254

For the past decade, numerous commercial and experimental systems have been designed for collaborative writing applications. From our experience working in the area of CSCW research and development, we have come to realize the possibility and the potential significance of CSCW systems in the engineering design process. The objective of the research is to introduce and develop a CSCW environment to support engineering design, specifically, in a distributed environment that combines computer aided design (CAD) and computer aided software engineering (CASE). In an effort to combine them into a seamless engineering package, we first target supporting engineering design (using CAD) with computer simulation (using CASE). This paper addresses issues involved in the design and development of the environment, including the graphical user interface, text and graphics editors, video and audio communication, multimedia database, document integration, and software simulation. © 1997 ACM 0-89791-925-4.

关键词： Computer aided design

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Spacecraft simulation Toolkit (SST): An advanced distributed simulation framework for supporting the space warfighter

Spacecraft Simulation Toolkit (SST): An advanced distributed...

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conference on Enabling Technology for simulation science

作者： deJonckheere, RK Franklin, TL Wilson, DD Air Force Phillips Lab. (United States) Photon Research Associates Inc. (United States)

ISBN: (纸本)0819424986

The Spacecraft simulation Toolkit (SST) is an advanced software architecture for the modeling and simulation of spacecraft and spacecraft interactions based upon state-of-the-art techniques, the Khoros visual programming environment, and accurate physical phenomenology. The SST simulates spacecraft systems and subsystems;the user virtually ''builds'' a spacecraft by selecting and integrating components, duplicating real world actions. The models in the SST perform algorithmic simulation of spacecraft functions. System design and simulation databases provide both the knowledge base within which detailed characteristics of the system are described and an efficient means to store simulation results for additional analysis. Representation of the real-world, natural environment is provided, Khoros also provides integrated data analysis and software development tools. The SST is being configured to meet a broad range of requirements in design, technology development, systems acquisition, on-orbit operations, and spacecraft operator training.

关键词： spacecraft modeling simulation architecture visual programming

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Vibration control of a multilayer piezoelectric cylindrical shell

Vibration control of a multilayer piezoelectric cylindrical ...

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ASME 1997 Design engineering Technical conferences, DETC 1997

作者： Qiu, Jinhao Tani, Junji Institute of Fluid Science Tohoku University 2-1-1 Katahira Sendai980-77 Japan

ISBN: (纸本)9780791880418

Equations of motion for multi-layer piezoelectric cylindrical shells and the equations of the integrated piezoelectric sensors are derived. The state equation is obtained by solving the equations of motion with modal expansion method. The feedback control, feedforward control, and their combination are applied in the control of forced vibration of the piezoelectric cylindrical shell with integrated sensor and actuators. The simulation and experimental results show that good control effectiveness can be obtained by using the integrated piezoelectric sensor and actuators in conjunction with the combination of feedback and feedforward control methods. © 1997 by ASME.

关键词： Equations of motion

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