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IEEE International Symposium on Biomedical Imaging

作者： R.S. MacLeod O.M. Weinstein J. Davison de St Germain D.H. Brooks C.R. Johnson S.G. Parker Scientific Computing and Imaging Institute University of Utah Salt Lake UT USA Department of Electrical and Computer Engineering Northeastern University Boston MA USA Center for Bioelectric Field Modeling Simulation and Visualization NIH/NCRR

SCIRun is a general purpose problem solving environment that seeks to integrate the steps of preparing, executing, and visualizing simulations of physical and biological systems. The implementation of SCIRun is by means of an interactive dataflow network consisting of modules and data pipes exposed as a visual programming language. SCIRun also contains specific modules for bioelectric field simulations and visualizations and the combination of SCIRun with this package is known as BioPSE (***/software/biopse). This software has been in the public domain since 2000 and in that time we have developed strategies for software development, engineering, testing, documentation, and training. We have also continued to expand the scope of the SCIRun/BioPSE package not only through our own codes but by constructing bridges to other systems, both open source and proprietary. We have also created a repository for relevant sample networks and datasets with the aim of allowing diverse groups to test and evaluate algorithms using identical data and to share their results with the community for comparison of performance and accuracy. We present here a summary of the software system and describe specific experiences and conclusions with regard to creating and managing a large open source software project carried out within a university setting.

关键词： Biopsy Problem-solving Bioelectric phenomena Data visualization Biological system modeling Packaging Biological systems computer languages Software packages Programming

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Multi-formalism modeling approach for semiconductor supply/demand networks 04

Multi-formalism modeling approach for semiconductor supply/d...

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simulation Winter Conference

作者： G.W. Godding H.S. Sarjoughian K.G. Kempf Component Automation Systems Intel Corporation Chandler AZ USA Arizona Center for Integrative Modeling & Simulation Computer Science & Engineering Department Arizona State University Tempe AZ USA Decision Technologies Intel Corporation Chandler AZ USA

ISBN: (纸本)9780780387867

Building computational models of real world systems usually requires the interaction of decision modules and simulation modules. Given different models and algorithms, the major hurdles in building a principled and robust system are model composibility and algorithm interoperability. We describe an approach to the composibility problem including initial results. This exposition is given in the context of linear programming as the decision technique and discrete event simulation as the simulation technique, both applied to the design and operation of semiconductor supply/demand networks.

关键词： Computational modeling Decision making Semiconductor materials Robustness Discrete event simulation Context modeling Engines Production facilities Buildings Linear programming

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Constraint-based contact analysis between deformable objects

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4th International Conference on Computational Science, ICCS 2004

作者： Hong, Min Choi, Min-Hyung Lee, Chris Bioinformatics University of Colorado Health Sciences Center 4200 E. 9th Avenue Campus Box C-245 DenverCO80262 United States Department of Computer Science and Engineering University of Colorado at Denver Campus Box 109 PO Box 173364 DenverCO80217 United States Center for Human Simulation University of Colorado Health Sciences Center P.O. Box 6508 Mail Stop F-435 AuroraCO80045 United States

ISBN: (纸本)3540221158

The key to the successful simulation of deformable objects is to model the realistic behavior of deformation when they are influenced by intricate contact conditions and geometric constraints. This paper describes constraint- based contact modeling between deformable objects using a nonlinear finite element method. In contrast to the penalty force based approaches, constraint- based enforcement of contact provide accuracy and freedom from finding proper penalty coefficients. This paper is focused on determining contact regions and calculating reaction forces at appropriate nodes and elements within the contact regions. The displacement and deformation of all nodes are dynamically updated based on the contact reaction forces. Our constraint based contact force computation method guarantees tight error bound at the contact regions and maintains hard constraints without overshoot or oscillation at the boundaries. In addition, the proposed method doesn't require us to choose proper penalty coefficients, thus greater numerical stability can be achieved and generally large integration steps can be utilized for the ODE solver. Contact conditions are formulated as nonlinear equality and inequality constraints and the force computation is cast into a nonlinear optimization problem. Our rigidto- deformable and deformable-to-deformable contact simulation demonstrates that the non-penetration constraints are well maintained. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Deformation

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Panel on future challenges in modeling methodology 04

Panel on future challenges in modeling methodology

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simulation Winter Conference

作者： S.J.E. Taylor P. Lendermann R.J. Paul S.W. Reichenthal S. Strassburger S.J. Turner Centre for Applied Simulation Modeling Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK Production and Logistics Planning Group Singapore Institute of Manufacturing Technology Singapore Boeing Anaheim CA USA Department Virtual Development Fraunhofer Institute of Factory Operation and Automation Magdeburg Germany Parallel & Distributed Computin Centre School of Computer Engineering Nanyang Technological University Singapore

ISBN: (纸本)9780780387867

This panel paper presents the views of six researchers and practitioners of simulation modeling. Collectively we attempt to address a range of key future challenges to modeling methodology. It is hoped that the views of this paper, and the presentations made by the panelists at the 2004 Winter simulation Conference will raise awareness and stimulate further discussion on the future of modeling methodology in areas such as modeling problems in business applications, human factors and geographically dispersed networks; rapid model development and maintenance; legacy modeling approaches; markup languages; virtual interactive process design and simulation; standards; and Grid computing.

关键词： Computational modeling Virtual manufacturing Logistics Human factors computer aided manufacturing Markup languages Process design Standards development Grid computing Discrete event simulation

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Panel on future challenges in modeling methodology

Panel on future challenges in modeling methodology

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Proceedings of the 2004 Winter simulation Conference

作者： Taylor, Simon J. E. Paul, Ray J. Straßburger, Steffen Lendermann, Peter Reichenthal, Steven W. Turner, Stephen J. Ctr. for Applied Simulation Modeling Dept. of Info. Systems and Computing Brunel University Uxbridge Middx UB8 3PH United Kingdom Fraunhofer Inst. Fact. Oper. A. Department Virtual Development Sandtorstraße 22 39106 Magdeburg Germany Prod. and Logistics Planning Group Singapore Inst. of Mfg. Technology 71 Nanyang Drive Singapore 638075 Singapore Boeing 3370 Miraloma Ave. Anaheim CA 92803 United States Parallel and Distributed Comp. Ctr. School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore

This panel paper presents the views of six researchers and practitioners of simulation modeling, Collectively we attempt to address a range of key future challenges to modeling methodology. It is hoped that the views of this paper, and the presentations made by the panelists at the 2004 Winter simulation Conference will raise awareness and stimulate further discussion on the future of modeling methodology in areas such as modeling problems in business applications, human factors and geographically dispersed networks;rapid model development and maintenance;legacy modeling approaches;markup languages;virtual interactive process design and simulation;standards;and Grid computing.

关键词： Information analysis

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An efficient algorithm for optimal allocation of wavelength converters in wavelength routing optical network

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Chinese Optics Letters 2004年第8期2卷 449-452页

作者：李蔚何军李源刘德明黄德修 Department of Optoelectronic Engineering Huazhong University of Science and Technology Wuhan 430074 Department of Computer Science Central China Normal University Wuhan 430070 Department of Optoelectronic Engineering Huazhong University of Science and Technology Wuhan 430074n a wavelength routing optical network (WRON) the optimal allocation of wavelength converters (WCs) is very important to minimize the number of WCs enhance the fiber utilization reduce the blocking probability etc.. In this paper a novel simplified network model with shared WCs has been proposed. An effective algorithm for optimal allocation of shared WCs has been presented by using a revised Dijkstra algorithm and genetic algorithm (GA). The effectiveness of the revised algorithm was verified through the simulation on Nature and Science Foundation (NSF) net of USA. This revised algorithm can achieve blocking probability 36% less than the algorithm in previous work and the calculating time of the minimum blocking probability can be reduced dramatically.

In a wavelength routing optical network (WRON), the optimal allocation of wavelength converters (WCs) is very important to minimize the number of WCs, enhance the fiber utilization, reduce the blocking probability, etc.. In this paper, a novel simplified network model with shared WCs has been proposed. An effective algorithm for optimal allocation of shared WCs has been presented by using a revised Dijkstra algorithm and genetic algorithm (GA). The effectiveness of the revised algorithm was verified through the simulation on Nature and Science Foundation (NSF) net of USA. This revised algorithm can achieve blocking probability 36% less than the algorithm in previous work, and the calculating time of the minimum blocking probability can be reduced dramatically.

关键词： node link

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A unified view of time and causality and its application to distributed simulation

A unified view of time and causality and its application to ...

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2003 Summer computer simulation Conference, SCSC 2003

作者： Nutaro, James J. Sarjoughian, Hessam S. Arizona Center for Integrative Modeling and Simulation Electrical and Computer Engineering Department University of Arizona TucsonAZ85721-0104 United States Arizona Center for Integrative Modeling and Simulation Computer Science and Engineering Department Arizona State University TempeAZ85287-5406 United States

ISBN: (纸本)1565552687

This paper presents a framework for distributed simulation that is based on system-theoretic and logical-process concepts. The framework describes a three-part world-view for developing simulation models. These are modeling formalisms, abstract simulators, and computational environments. A unified view of time and causality allows for the application of system-theoretic notions of causality within a distributed simulation environment. Within this framework, we introduce a unified notion of causality. Further we describe an approach for developing distributed simulation models which evolve from modeling constructs to simulation algorithms and their implementations. The framework is exemplified using the Discrete EVent System Specification (DEVS) modeling formalism, its abstract simulator, and a parallel algorithm that implements the abstract simulator.

关键词： Specifications

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Personality representation processable in fuzzy logic for human behavior simulation

Personality representation processable in fuzzy logic for hu...

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2003 Summer computer simulation Conference, SCSC 2003

作者： Oren, Tuncer I. Ghasem-Aghaee, Nasser Ottawa Center of the McLeod Institute of Simulation Sciences OC-MISS SiTE University of Ottawa OttawaON Canada OC-MISS Department of Computer Engineering University of Isfahan Isfahan Iran

ISBN: (纸本)1565552687

The state-of-the art of psychological knowledge about the personality types is distilled to provide a basis for the specification of fuzzy agents with dynamic personality for the simulation of human behavior. The thirty facets, clustered in five traits (or, factors) to determine the personality types are outlined. Three concise representations of the primary characteristics of human personality are presented: they are: personality template, personality vector, and personality charts. In an accompanying article Ghasem-Aghaee and Oren, 2003, the first two of these representations provide the basis for using fuzzy logic to process qualitative (or linguistic) personality variables.

关键词： Fuzzy logic

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Experimental Analysis of a Gossip-Based Service for Scalable, Distributed Failure Detection and Consensus

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Cluster Computing 2003年第3期6卷 237-251页

作者： Sistla, Krishnakanth George, Alan D. Todd, Robert W. High-performance Computing and Simulation (HCS) Research Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville USA

Gossip protocols and services provide a means by which failures can be detected in large, distributed systems in an asynchronous manner without the limits associated with reliable multicasting for group communications. Extending the gossip protocol such that a system reaches consensus on detected faults can be performed via a flat structure, or it can be hierarchically distributed across cooperating layers of nodes. In this paper, the performance of gossip services employing flat and hierarchical schemes is analyzed on an experimental testbed in terms of consensus time, resource utilization and scalability. Performance associated with a hierarchically arranged gossip scheme is analyzed with varying group sizes and is shown to scale well. Resource utilization of the gossip-style failure detection and consensus service is measured in terms of network bandwidth utilization and CPU utilization. Analytical models are developed for resource utilization and performance projections are made for large system sizes.

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High-performance embedded computing for Conventional Matched-Field Processing

High-performance embedded computing for Conventional Matched...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： K. Kim A. George High-performance Computing and Simulation (HCS) Research Laboratory Department of Electrical and Computer Engineering FAMU and FSU College of Engineering USA High-performance Computing and Simulation (HCS) Research Laboratory Department of Electrical and Computer Engineering University of Florida USA

Advanced sonar algorithms with complex-wave propagation processing are of critical importance in the field of acoustic signal processing, as they possess the ability to localize signal sources more precisely in a cluttered environment. Conventional Matched-Field Processing (CMFP) is such an algorithm that provides range and depth results by employing environmental parameters. However, the enhancement of features is limited by the extensive computational and memory requirements of the algorithm even for a small problem size. High-performance computing, when applied to matched-field processing on a microprocessor-based distributed system, can provide solutions for this challenging problem in performance, scalability, and cost. Based on domain decomposition techniques, two parallel algorithms for matched-field processing are introduced in this paper for in-situ signal processing. Performance results collected on low-power distributed embedded systems are presented in terms of execution times and parallel efficiencies. The results of these analyses demonstrate that parallel in-situ processing holds the potential to meet the needs of matched-field processing in a scalable fashion.

关键词： Embedded computing Signal processing algorithms Sonar Acoustic propagation Acoustic signal processing Signal processing Distributed computing High performance computing Scalability Costs

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