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Annual Symposium on simulation

作者： Gary Tan Wee Ngee Ng S.J.E. Taylor School of Computing National University of Singapore Singapore Centre for Applied Simulation Modelling Department of Information Systems and Computing Brunei University Uxbridge UK

Supply chain management (SCM) is a series of activities, usually sequential, that an organisation, or a network of organisations, uses to deliver products and/or services to customers. With the globalisation of commercial markets, distributed supply chain (DSQ) simulation, connecting organisations from various parts of the world, has gained significance in supply chain management decision support. DSC simulation requires that information be transferred between individual simulations (interoperability) in a timely and consistent manner. In this work GRIDS (Generic Runtime Infrastructure for Distributed simulation), an extensible, service-based RTI, is used to successfully transfer timely information between simulations. However, the question of what format this information should take still remains. This paper presents the development of an Object Exchange Model Template (OEMT), for DSC simulation in GRIDS. These are templates for standard object creation within a DSC simulation, so as to facilitate standard object transfers between the various simulations that compose a DSC simulation. The templates are stored in an Object Exchange Model Repository (OEMR) for easy access by all simulation builders intending to build a DSC simulation using GRIDS. The OEMT facilitates interoperability by providing a common "language" that can be used to share information (objects) between simulations. This approach can also facilitate data distribution management (DDM) services. The OEMT is intended to extend and complement the OMT of the High Level Architecture.

关键词： Supply chains Computational modeling Supply chain management Joining processes Runtime Distributed decision making Middleware Documentation Distributed computing Grid computing

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Global search strategies for simulation optimisation

Global search strategies for simulation optimisation

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simulation Winter Conference

作者： G.D. Magoulas T. Eldabi R.J. Paul Centre for Applied Simulation Modelling (CASM) Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK

simulation optimization is rapidly becoming a mainstream tool for simulation practitioners, as several simulation packages include add-on optimization tools. We are concentrating on an automated optimization approach that is based on adapting model parameters in order to handle uncertainty that arises from stochastic elements of the process under study. We particularly investigate the use of global search methods in this context, as these methods allow the optimization strategy to escape from sub-optimal (i.e., local) solutions and, in that sense, they improve the efficiency of the simulation optimization process. The paper compares several global search methods and demonstrates the successful application of the Particle Swarm Optimizer to simulation modeling optimization and design of a steelworks plant, a representative example of the stochastic and unpredictable behavior of a complex discrete event simulation model.

关键词： Computational modeling Optimization methods Discrete event simulation Simulated annealing Stochastic processes Design optimization Power system modeling Input variables Information systems Packaging

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Explorative modeling for prioritizing liver transplantation waiting lists

Explorative modeling for prioritizing liver transplantation ...

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Annual Symposium on simulation

作者： T. Eldabi R. Macredie R.J. Paul Centre for Applied Simulation Modelling Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK

ISBN: (纸本)0769510922

Health care systems are known to be quite complex in structure and operation. The technology of liver transplantation is one of the aspects of health care systems that has always been difficult to grasp. The main problem with liver transplantation is the fact that it is not easy to study using traditional quantitative tools. The paper demonstrates the use of discrete event simulation as an explorative tool to help stakeholders to understand the behavior of the system so that they can achieve informed decisions with regard to the prioritization of patients waiting for transplantation. The paper also shows the construction of a tailor-made package (LiverSim) and provides an example of how this package is used by the stakeholders to assist in the evaluation process. Some final lessons are drawn that simulation helps in exploring more issues outside the boundaries of quantitative results.

关键词： Liver diseases Medical services Discrete event simulation Packaging Europe Decision making Computational modeling Information systems Performance evaluation Hospitals

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A proposed approach for modeling healthcare systems for understanding

A proposed approach for modeling healthcare systems for unde...

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simulation Winter Conference

作者： T. Eldabi R.J. Paul Centre for Applied Simulation Modelling CASM Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK

The use of simulation in the healthcare area is not widespread when compared with other areas. The paper suggests that traditional approaches to modeling may not fully utilize simulation for tackling healthcare problems. Healthcare systems are often complex with multiple decision makers. A modeling approach is proposed which enhances stakeholders' understanding and intercommunications. The structure of this approach is participative, including the stakeholders. The behavior of the approach is iterative rather than step-based. An example is given showing how this approach is used for facilitating the modeling process. It is found that involving stakeholders throughout the modeling process helps them understand their problem, coupled with more appreciation for findings from the model. This process is also found to be useful in enhancing stakeholder intercommunication.

关键词： Medical services Computational modeling Medical simulation Analytical models Information systems Manufacturing processes Virtual manufacturing Logistics Back Business

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Assessment of student preparation for discrete event simulation courses

Assessment of student preparation for discrete event simulat...

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simulation Winter Conference

作者： L. Chwif M.R.P. Barretto R.J. Paul Department of Industrial Engineering Mauá School of Engineering Sao Caetano do Sul Brazil Mechatronics Laboratory University of São Paulo Sao Paulo Brazil Centre for Applied Simulation Modelling Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK

Over the past years, there has been a growth in simulation courses both at undergraduate and postgraduate levels. A discrete event simulation course, as with any non-basic course, has some prerequisites that must be satisfied by students before attending classes. Statistics, computer programming and modeling are the most important, together with knowledge on the specific field being simulated (manufacturing, logistics, etcetera). Are students sufficiently prepared to follow a course on simulation? This work is related to the construction, application and analysis of an assessment instrument to evaluate student prerequisite knowledge for a discrete event simulation course. The proposed questionnaire was given to the 5/sup th/ year engineering students at the beginning of our first year (72 hours) discrete event simulation introductory course at Maua School of Engineering. The results obtained show the importance of making an assessment evaluation in order to improve the quality of simulation learning.

关键词： Discrete event simulation Computational modeling Statistics Programming Computer simulation Computer aided manufacturing Virtual manufacturing Logistics Application software Instruments

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Netmeeting: A tool for collaborative simulation modelling

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International Journal of simulation: systems, Science and Technology 2000年第1-2期1卷 59-68页

作者： Taylor, Simon J. E. Centre for Applied Simulation Modelling Department of Information Systems and Computing Brunel University Uxbridge Middx United Kingdom

Effective collaboration in simulation modelling is possibly one of the key factors in the success of a simulation project. Computer Supported Cooperative Work is a research field that has investigated this in other domains. This field has led to the technological development of software, or groupware, to facilitate group working. This paper investigates the appropriateness of groupware in simulation modelling by introducing Microsoft’s NetMeeting, an exemplar of this technology. This groupware is discussed in terms of simulation modelling activities. A short survey of expert opinion is also presented to evaluate the usefulness of this technology. The survey shows that application sharing is clearly perceived to be the most useful feature of NetMeeting. © 2000, UK simulation Society. All right reserved.

关键词： Groupware

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A review of Web based simulation: whither we wander?

A review of Web based simulation: whither we wander?

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simulation Winter Conference

作者： J. Kuljis R.J. Paul Centre for Applied Simulation Modelling Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK

This paper considers a variety of new technologies for discrete-event simulation software development. Environments and languages for Web based simulation are reviewed. Web based applications are discussed. After proposing a summary of the review, ways of working that will have an unpredictable effect on the future of simulation modeling are proposed.

关键词： Computational modeling Java Computer simulation Application software Internet Collaboration Information systems Discrete event simulation Programming Computer languages

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computing and data grids for science and engineering

Computing and data grids for science and engineering

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2000 ACM/IEEE Conference on Supercomputing, SC 2000

作者： Johnston, William E. Gannon, Dennis Nitzberg, Bill Tanner, Leigh Ann Thigpen, Bill Woo, Alex National Energy Research Scientific Computing Division Lawrence Berkeley National Laboratory Numerical Aerospace Simulation Division NASA Ames Research Center United States Computer Science Department University of Indiana and NAS NASA Ames United States Veridian Systems PBS Products United States Numerical Aerospace Simulation Division NASA Ames Research Center United States

ISBN: (纸本)0780398025

We use the term "Grid" to refer to a software system that provides uniform and location independent access to geographically and organizationally dispersed, heterogeneous resources that are persistent and supported. While, in general, Grids will provide the infrastructure to support a wide range of services in the scientific environment (e.g. collaboration and remote instrument control) in this paper we focus on services for high performance computing and data handling. We describe the services and architecture of NASA's Information Power Grid ("IPG") - an early example of a large-scale Grid - and some of the issues that have come up in its implementation. © 2000 IEEE.

关键词： Data handling

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Using simulation for the economic evaluation of liver transplantation

Using simulation for the economic evaluation of liver transp...

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simulation Winter Conference

作者： L.P. Baldwin T. Eldabi R.J. Paul A.K. Burroughs Centre for Applied Simulation Modelling CASM Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK Department of Medicine Royal Free Hospital and School of Medicine London UK

This paper demonstrates the use of simulation in an evaluative study for the technology of liver transplantation from the cost-effectiveness point of view. This study is conducted in the United Kingdom where there are no explicit guidelines for the prioritization of patients waiting for transplantation. Another objective of the model is to enable health economists to understand the technology of liver transplantation and evaluate alternative policies for prioritizing patients in the waiting list. The paper shows the construction of a tailor-made package (LiverSim) and provides an example of how this package is used by the stakeholders to assist in the evaluation process. Some final lessons are drawn that simulation helps in exploring more issues outside the boundaries of quantitative results.

关键词： Hospitals Computational modeling Packaging Liver diseases Information systems Guidelines Europe Decision making Surgery Blood

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On simulation model complexity

On simulation model complexity

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simulation Winter Conference

作者： L. Chwif M.R.P. Barretto R.J. Paul Mechatronics Laboratory University of São Paulo Sao Paulo Brazil Centre for Applied Simulation Modelling Department of Information Systems and Computing Brunei University Middlesex UK

Nowadays the size and complexity of models is growing more and more, forcing modelers to face some problems that they were not accustomed to. Before trying to study ways to deal with complex models, a more important and primary question to explore is, is there any means to avoid the generation of complex models? The primary purpose of this paper is to discuss several issues regarding the complexity of simulation models, summarizing the findings in this area so far, and calling attention to this area that, despite its importance, appears to remain at the bottom of simulation research agendas.

关键词： Computational modeling Computer simulation Mechatronics Information systems Computer performance Project management Resource management Time factors Software performance Animation

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