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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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Predictive quantization-based filtering in distributed traffic simulation

Predictive quantization-based filtering in distributed traff...

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2003 Summer computer simulation Conference, SCSC 2003

作者： Leer, Jongkeun Chit, Sungdo Zeigler, Bernard P. Arizona Center for Integrative Modeling and Simulation Dept. of Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States Intelligent Systems Research Lab. Dept. of Computer Engineering Hangkong University Seoul Korea Republic of

ISBN: (纸本)1565552687

This paper proposed predictive quantization-hased filtering method that uses average speed-based dynamic quantum size to effectively reduce communication overhead that DEVS/HLA-based distributed traffic simulation has. Average speed-based dynamic quantum size monitors dynamically changing road situation at fixed time unit and set vehicles 'average speed to dynamic quantum size. Then it generates individual quantum size offactors such as the distance from the leading vehicle, speed and acceleration that decide traffic models 'behavior by using dynamic quantum size. Therefore, the suggested methodology has an advantage in that it effectively reduces communication overhead among federates of distributed traffic simulation. This paper verified validity of the suggested method by doing distributed modeling the 32km block from East Seoul to Hobup of JOOJ'/GBOO highway in Korea and analyzing the simulation.

关键词： Cost reduction

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Feature preserving manifold mesh from an octree

Feature preserving manifold mesh from an octree

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Eighth ACM Symposium on Solid modeling and Applications

作者： Ashida, Koji Badler, Norman I. Ctr. for Hum. Modeling/Simulation Department of Computer Science University of Pennsylvania 200 S. 33rd St. Philadelphia PA 19104-6389 United States

We describe an algorithm to generate a manifold mesh from an octree while preserving surface features. The algorithm requires samples of a surface (coordinates) on the octree edges, along with the surface normals at those coordinates. The distinct features of the algorithm are: • the output mesh is manifold, • the resolution of the output mesh can be adjusted over the space with octree subdivision, and • surface features are generally preserved. A mesh generation algorithm with this combination of advantages has not been presented before.

关键词： computer science

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Real-time reach planning for animated characters using hardware acceleration

Real-time reach planning for animated characters using hardw...

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computer Animation

作者： Ying Liu N.I. Badler Center for Human Modeling and Simulation Department of Computer and Information Science University of Pennsylvania USA

We present a heuristic-based real-time reach planning algorithm for virtual human figures. Given the start and goal positions in a 3D workspace, our problem is to compute a collision-free path that specifies all the configurations for a human arm to move from the start to the goal. Our algorithm consists of three modules: spatial search, inverse kinematics, and collision detection. For the search module, instead of searching in joint configuration space like most existing motion planning methods do, we run a direct search in the workspace, guided by a heuristic distance-to-goal evaluation function. The inverse kinematics module attempts to select natural posture configurations for the arm along the path found in the workspace. During the search, candidate configurations will be checked for collisions taking advantage of the graphics hardware-depth buffer. The algorithm is fast and easy to implement. It allows real-time planning not only in static, structured environments, but also in dynamic, unstructured environments. No preprocessing and prior knowledge about the environment is required. Several examples are shown illustrating the competence of the planner at generating motion plans for a typical human arm model with seven degrees of freedom.

关键词： Animation Hardware Acceleration Humans computer graphics Motion planning Application software Computational modeling computer simulation Kinematics

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Autobiographical retrospectives: The evolution of theory of modeling and simulation

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International Journal of General Systems 2003年第3期32卷 X-236页

作者： Zeigler, Bernard P. Arizona Center for Integrative Modeling and Simulation Department of Electrical and Computer Engineering University of Arizona Tucson AZ 85721 United States

No abstract available

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A Virtual Environment for Training Military Checkpoint Guards

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Proceedings of the Human Factors and Ergonomics Society Annual Meeting 2003年第19期47卷 2074 - 2078页

作者： Jean M. Catanzaro Mark W. Scerbo Frederic McKenzie Mark A. Phillips Nathan R. Bailey R. Bowen Loftin Department of Psychology Old Dominion University Department of Electrical and Computer Engineering Old Dominion University Virginia Modeling Analysis and Simulation Center Old Dominion University

The present study describes a Virtual Environment (VE) designed to train individuals to perform the role of a military checkpoint guard. Participants stood guard at a fictitious base in which simulated drivers in vehicles would approach seeking entrance. Participants were asked to inspect each vehicle, interact with the drivers, verify their identification, and make a decision to allow the driver to enter the base, to detain the vehicle, or to ask the driver to turn around and leave. The experiment was conducted in a CAVE™ with stereoscopic visual and auditory displays, participant tracking, and voice recognition. The results showed that participants were able to learn quite effectively in the VE with the biggest performance improvements seen in the areas of proper protocol and social influence. These findings suggest that VE technology holds promise for activities that are more like experience-based training and which place a greater emphasis on social interaction skills.

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modeling and simulation of distributed security models

Modeling and simulation of distributed security models

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International Conference on Computational Science, ICCS 2003

作者： Seo, Hee Suk Cho, Tae Ho Do Chi, Sung School of Information and Communications Engineering Modeling and Simulation Lab Sungkyunkwan University Suwon440-746 Korea Republic of Department of Computer Engineering Hangkong University Koyang-si Hwajeon-dong 2001-1 Seoul411-791 Korea Republic of

ISBN: (纸本)3540401970

It is quite necessary that an organization’s information network should be equipped with a proper security system based on its scale and importance. One of the effective methods is to use the simulation model for deciding which security policy and mechanism is appropriate for the complex network. The need arises for systems to coordinate with one another, to manage diverse attacks across networks. The coordination issue is the essential problem since it is beyond the scope of any one IDS (Intrusion Detection System) to deal with the intrusions. This paper shows a modeling and simulation of network security in which the multi-security agents coordinate by sharing attacker’s information for the effective detection of the intrusion. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Network security

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Camera calibration of long image sequences with the presence of occlusions

Camera calibration of long image sequences with the presence...

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IEEE International Conference on Image Processing

作者： M. Sainz A. Susin N. Bagherzadeh Image Based Modeling and Rendering Laboratory Department of Electrical and Computer Science University of California Irvine USA Dynamic Simulation Laboratory Department Mstematica Aplicada 1 Universitat Poliltècnica de Catalunya Spain Image Based Modeling and Rendering LaboratoryDepartment of Electrical and Computer Science University of California Irvine USA

Camera calibration is a critical problem in applications such as augmented reality and image based model reconstruction. When constructing a 3D model of an object from an uncalibrated video sequence, large amounts of frames and self occlusions of parts of the object are common and difficult problems. In this paper we present a fast and robust algorithm that uses a divide and conquer strategy to split the video sequence into sub-sequences containing only the most relevant frames. Then a robust stratified linear based algorithm is able to calibrate each of the subsequences to a metric structure and finally the subsequences are merged together and a final nonlinear optimization refines the solution. Examples of real data reconstructions are presented.

关键词： Cameras Calibration Image sequences Rendering (computer graphics) Video sequences Layout Image reconstruction computer science Robustness Computational modeling

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Semiconductor supply network simulation

Semiconductor supply network simulation

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simulation Winter Conference

作者： Godding Sarjoughian 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

More efficient and effective control of supply networks is conservatively worth billions of dollars to the national and world economy. Developing improved control requires simulation of physical flows of materials involved and decision policies governing these flows. We describe our initial work on modelling each of these flows as well as simulating their integration through the synchronized interchange of data. We show the level of abstraction that is appropriate, formulate and test a representative model, and describe our findings and conclusions.

关键词： Testing Production facilities Computational modeling Raw materials Customer service Costs Material storage Network topology Scalability Automation

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Scalability of a low-cost multi-Teraflop Linux cluster for high-end classical atomistic and quantum mechanical simulations

Scalability of a low-cost multi-Teraflop Linux cluster for h...

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International Parallel and Distributed Processing Symposium, IPDPS 2003

作者： Kikuchi, Hideaki Kalia, Rajiv K. Nakano, Aiichiro Vashishta, Priya Shimojo, Fuyuki Saini, Subhash Collaboratory for Multiscale Simulations Department of Computer Science Department of Physics and Astronomy Department of Materials Science Department of Biomedical Engineering University of Southern California Los AngelesCA90089 United States Concurrent Computing Laboratory for Materials Simulations Biological Computation and Visualization Center Department of Computer Science Department of Physics and Astronomy Louisiana State University Baton RougeLA70803 United States Faculty of Integrated Arts and Sciences Hiroshima University Higashi-Hiroshima739-8521 Japan IT Modeling and Simulation NASA Ames Research Center Moffett FieldCA94035 United States

ISBN: (纸本)0769519261

Scalability of a low-cost, Intel Xeon-based, multi-Teraflop Linux cluster is tested for two high-end scientific applications: Classical atomistic simulation based on the molecular dynamics method and quantum mechanical calculation based on the density functional theory. These scalable parallel applications use spacetime multiresolution algorithms and feature computational-space decomposition, wavelet-based adaptive load balancing, and spacefilling-curve-based data compression for scalable I/O. Comparative performance tests are performed on a 1024-processor Linux cluster and a conventional higher-end parallel supercomputer, 1184-processor IBM SP4. The results show that the performance of the Linux cluster is comparable to that of the SP4. We also study various effects, such as the sharing of memory and L2 cache among processors, on the performance. © 2003 IEEE.

关键词： Scalability

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