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simulation Winter Conference

作者： R.G. Sargent Simulation Research Group Department of Electrical Engineering and Computer Science College of Engineering and Computer Science Syracuse University Syracuse NY USA

The paper discusses verification, validation, and accreditation of simulation models. The different approaches to deciding model validity are presented; how model verification and validation relate to the model development process are discussed; various validation techniques are defined; conceptual model validity, model verification, operational validity, and data validity are described; ways to document results are given; a recommended procedure is presented; and accreditation is briefly discussed.

关键词： Accreditation Computational modeling Random variables Costs computer simulation Educational institutions computer science Problem-solving Decision making Application software

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Doctoral colloquium keynote address: being a professional

Doctoral colloquium keynote address: being a professional

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simulation Winter Conference

作者： R.G. Sargent Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY USA

Provides an abstract of the keynote presentation and a brief professional biography of the presenter. The complete presentation was not made available for publication as part of the conference proceedings.

关键词： engineering profession Professional societies Books Computational modeling computer simulation Finishing Continuing education Subscriptions Operations research Ethics

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Web-Based simulation: Revolution or Evolution?

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ACM Transactions on Modeling and computer simulation 2000年第1期10卷 3-17页

作者： Page, Ernest H. Buss, Arnold Fishwick, Paul A. Healy, Kevin J. Nance, Richard E. Paul, Ray J. MITRE Corporation 1820 Dolley Madison Blvd. McLean VA 221021 Operations Research Department Naval Postgraduate School Monterey CA 22102 Department of Computer Engineering University of Florida Gainesville FL 22102 ThreadTec Inc. P.O. Box 7 Chesterfield MO 63017 Systems Research Center Department of Computer Science Virginia Tech Blacksburg VA 24061 Ctr. for Applied Simulation Modeling Brunel University Uxbridge Middlesex UB8 3PH United Kingdom

The nature of the emerging field of web-based simulation is examined in terms of its relationship to the fundamental aspects of simulation research and practice. The presentation, assuming a form of debate, is based on a panel session held at the first International Conference on Web-Based Modeling and simulation, which was sponsored by the Society for computer simulation during 11-14 January 1998 in San Diego, California. While no clear "winner" is evident in this debate, the issues raised here certainly merit ongoing attention and contemplation.

关键词： World Wide Web

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Creating distributed simulation using DEVS M&S environments

Creating distributed simulation using DEVS M&S environments

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simulation Winter Conference

作者： B.P. Zeigler H.S. Sarjoughian Arizona Center for Integrative Modeling and Simulation Electrical & Computer Engineering Department University of Arizona Tucson Tucson AZ USA

We briefly review the theory of modeling and simulation and its support for constructing distributed simulations. Formal representation of simulation models can contribute to a number of aspects in the modeling and simulation enterprise. Separation of models from simulation execution engines is a prerequisite transferring models among phases of a project as well as from project to project. The Discrete Event System Specification (DEVS) formalism, drawing on its system theoretical basis, provides a number of important properties such as hierarchical, modular composition, universality and uniqueness that can support development of simulation models and environments. A layered architecture for supporting comprehensive M&S environments is discussed that unifies the theoretical framework with implementation in distributed computational environments.

关键词： Object oriented modeling Computational modeling computer architecture Artificial intelligence computer networks Power system modeling computer simulation Workstations Visualization Animation

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Model structure and load balancing in optimistic parallel discrete event simulation

Model structure and load balancing in optimistic parallel di...

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Workshop on Principles of Advanced and Distributed simulation (PADS)

作者： T.K. Som R.G. Sargent Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY USA IBM Syracuse Canada

The concept of strong groups is introduced to describe the structure of simulation models. It is shown that logical processes within strong groups process at approximately the same rate and that different strong groups can progress at different rates. An algorithm based on the rates of the strong groups is presented to balance the load among the physical processors and for flow control.

关键词： Load modeling Load management Discrete event simulation computer science Computational modeling computer simulation Protocols Scheduling

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MATLAB/Simulink and PSPice as modelling tools for power systems and power electronics

MATLAB/Simulink and PSPice as modelling tools for power syst...

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IEEE Summer Meeting Power engineering Society

作者： Hoang Le-Huy G. Sybille Department of Electrical and Computer Engineering Université Laval QUE Canada Power Networks Simulation Laboratory Institut de Recherche d''Hydo-Québec Varennes QUE Canada

The Power System Blockset (PSB) simulation tool uses the MATLAB/Simulink environment to represent common components and devices found in electrical power networks. The PSB is well suited to the simulation of medium size power systems and power electronics using variable or fixed step algorithms from Simulink. The PSB libraries contain basic elements as well as many ready-built sub-systems. Control systems using Simulink blocks can be naturally integrated into the power system model. The computation capabilities of MATLAB/Simulink can be advantageously exploited in post-processing of the simulation results. SPICE (simulation Program with Integrated Circuit Emphasis) can perform nonlinear DC, nonlinear transient, and linear AC analyses. In addition to the standard R,L and C elements, models for transmission lines and several semiconductor devices types are also available. In the study of power systems, PSpice is well suited for device-level modeling of small size systems: study of voltages and currents in power converters, snubber circuit design, study of transformer transients, etc. Also, PSpice performs well for system-level modeling of small size power systems (less than 30 states and 6 switches) using ideal switch models instead of detailed semiconductor models.

关键词： Power system modeling MATLAB Mathematical model Power system simulation Power system transients Power system analysis computing Computational modeling SPICE Power semiconductor switches Power electronics

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Digital simulation of power systems and power electronics using the MATLAB/Simulink Power System Blockset

Digital simulation of power systems and power electronics us...

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IEEE Winter Meeting Power engineering Society

作者： G. Sybille Hoang Le-Huy Power System Simulation Laboratory Institut de recherche d''Hydro-Quebec Varennes QUE Canada Department of Electrical and Computer Engineering Université Laval Sainte-Foy QUE Canada

The Power System Blockset (PSB) is a graphic tool that allows schematics and simulation of power systems to be built in the Simulink environment. The blockset uses the MATLAB/Simulink environment to represent common components and devices found in electrical power networks. Simulink's variable-step event-sensitive integration algorithms allow increased accuracy in zero-crossing detection of currents as compared with fixed step algorithms. One important feature of the Power System Blockset which has been introduced with version 2.0 is its ability to simulate either with continuous variable time-step integration algorithms or with a discretized system. For small and medium size systems, variable time steps algorithms are usually faster because the number of steps will be less than with a fixed-time step method. However, for large systems which contain many states or many nonlinear blocks such as power electronic switches, it is advantageous to discretize the electrical system. Both the continuous integration and fixed-time step methods are illustrated. The graphic interface of Simulink provides a user-friendly environment where the power circuit and control system are represented in the same diagram. The results are displayed while the simulation is running. The processing power of MATLAB allows the designer to perform complex post-processing on simulation results. This special technical session presents the features of the Power System Blockset and its applications in the simulation of power systems and power electronics systems.

关键词： Power system simulation Digital simulation MATLAB Power electronics Circuit simulation Libraries Power system modeling Power system analysis computing Graphics Control systems

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FDTD speedups obtained in distributed computing on a Linux workstation cluster

FDTD speedups obtained in distributed computing on a Linux w...

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Antennas and Propagation Society International Symposium

作者： G.A. Schiavone I. Codreanu R. Palaniappan P. Wahid Institute for Simulation and Training (IST) University of Central Florida USA Center for Research in Electro-optics and Lasers (CREOL) University of Central Florida USA Department of Electrical and Computer Engineering University of Central Florida USA

The project investigated various aspects of parallel FDTD implementation on a workstation cluster. The computation grid was divided among nodes. For a fixed size problem, as the number of processor increases, the speedup saturates. This happens because each processor spends less time computing but essentially the same time communicating with its neighbors. To take advantage of the parallel algorithm, the problem size must be sufficiently large compared with the number of processors. For very large problems, we can efficiently employ a large number of processors to obtain a linear speedup. In this work, the message passing interface (MPI) parallel implementation was integrated with POSIX threads using the pthreads library. This was required because each node in the cluster was equipped with two processors. On each node, each process contained two threads that executed in parallel. As expected, for sufficiently large problems the speedup was increased by almost a factor of two when using threads.

关键词： Finite difference methods Time domain analysis Distributed computing Linux Yarn Workstations Grid computing Parallel algorithms Message passing Libraries

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Load balancing across near-homogeneous multi-resource servers

Load balancing across near-homogeneous multi-resource server...

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Heterogeneous Computing Workshop

作者： W. Leinberger G. Karypis V. Kumar R. Biswas Army High Performance Computing and Research Center Department of Computer Science and Engineering University of Minnesota MRJ Technology Solutions Numerical Aerospace Simulation Division NASA Ames Research Center Moffett Field CA USA

An emerging model for computational grids interconnects similar multi-resource servers from distributed sites. A job submitted to the grid can be executed by any of the servers; however, resource size or balance may be different across servers. One approach to resource management for this grid is to layer a global load distribution system on top of the local job management systems at each site. Unfortunately, classical load distribution policies fail on two aspects when applied to a multi-resource server grid First, simple load indices may not recognize that a resource imbalance exists at a server. Second, classical job selection policies do not actively correct such a resource-imbalanced state. We show through simulation that new policies based on resource balancing perform consistently better than the classical load distribution strategies.

关键词： Load management Resource management High performance computing NASA Grid computing Military computing Contracts computer science Space technology Aerospace simulation

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Conceptions of curriculum for simulation education

Conceptions of curriculum for simulation education

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simulation Winter Conference

作者： H. Szczerbicka J. Banks R.V. Rogers T.I. Oren H.S. Sarjoughian B.P. Zeigler Institute for Computer Science Fachbereich Mathematik und Informatik University of Hannover Hanover Germany AutoSimulations A Brooks Automation company Marietta GA USA Department of Engineering Management Virginia Modeling Analysis and Simulation Center Old Dominion University Norfolk VA USA Turkish Science and Technical Research Council Marmara Research Center Information Technologies Research and Development Center Gebze Kocaeli Turkey Arizona Center for Integrative Modeling and Simulation Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

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