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simulation Winter Conference

作者： L.A. Belfore S. Battula Department of Electrical and Computer Engineering Virginia Modeling Analysis and Simulation Center Old Dominion University Norfolk VA USA Ynot Team Inc. VA USA

Internet based virtual reality offers the opportunity to render content in three dimensions. In addition, the Internet provides a medium to support collaborative activities. In this work, we describe how collaborative capabilities are integrated into the Interactive Land use VRML Application (ILUVA). ILUVA is a VRML based application that supports highly interactive functionality, live updates, and the dynamic generation of VRML content. The collaborative functions have been added in the context of an Internet chat session in which multiple users may participate from the Internet. In addition to the usual functions supported by chat applications, user information sharing is supported. The union or intersection of sessions from different users may be produced and reviewed in the world.

关键词： Internet Collaborative work Collaboration Geographic Information Systems Computational modeling Analytical models computer simulation Virtual reality Fabrics Business communication

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Scalable atomistic simulation algorithms for materials research

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Scientific Programming 2002年第4期10卷 263-270页

作者： Nakano, Aiichiro Kalia, Rajiv K. Vashishta, Priya Campbell, Timothy J. Ogata, Shuji Shimojo, Fuyuki Saini, Subhash Department of Computer Science Dept. of Mat. Sci. and Engineering University of Southern California Los Angeles CA 90089 United States Concurrent Computing Lab. for MS Biol. Comp. and Visualization Center Louisiana State University Baton Rouge LA 70803 United States Department of Applied Sciences Yamaguchi University Ube 755-8611 Japan Faculty of Integrated Arts and Sci. Hiroshima University Higashi-Hiroshima 739-0046 Japan IT Modeling and Simulation NASA Ames Research Center Moffett Field CA 94035-1000 United States

A suite of scalable atomistic simulation programs has been developed for materials research based on space-time multiresolution algorithms. Design and analysis of parallel algorithms are presented for molecular dynamics (MD) simulations and quantum-mechanical (QM) calculations based on the density functional theory. Performance tests have been carried out on 1,088-processor Cray T3E and 1,280-processor IBM SP3 computers. The linear-scaling algorithms have enabled 6.44-billion-atom MD and 111,000-atom QM calculations on 1,024 SP3 processors with parallel efficiency well over 90%. The production-quality programs also feature wavelet-based computational-space decomposition for adaptive load balancing, spacefilling-curve-based adaptive data compression with user-defined error bound for scalable I/O, and octree-based fast visibility culling for immersive and interactive visualization of massive simulation data.

关键词： Parallel algorithms

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Using VR technology for training of minimally invasive vascular surgery

Using VR technology for training of minimally invasive vascu...

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Third International Conference on Virtual Reality and Its Application in Industry

作者： Cai, Yiyu Chui, Cheekong Ye, Xiuzi Anderson, James H. Wang, Yaoping Ctr. for Adv. Numer./Eng. Simulation Sch. of Mech./Production Engineering Nanyang Technological University 50 Nanyang Avenue Singapore Singapore Bio-medical Imaging Lab. Kent Ridge Digital Labs 13 Hon Mui Keng Terrace Singapore Singapore Department of Computer Science Stt. Key Lab. of CAD/Comp. Graphics Zhejiang University Hangzhou China School of Medicine Johns Hopkins University Baltimore MD United States

This paper describes a computerized simulation system for minimally invasive vascular interventions using Virtual-Reality (VR) based technology. A virtual human patient is constructed using the Visible Human Data (VHD). A knowledge-based human vascular network is developed to describe human vascular anatomy with diseased lesions for different interventional applications. A potential field method is applied to model the interaction between the blood vessels and vascular catheterization devices. A haptic interface is integrated with the computer simulation system to provide tactile sensations to the user during the simulated catheterization procedures. The system can be used for physician training and for pre-treatment planning of interventional vascular procedures.

关键词： Virtual reality

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Adaptive Rendering Based on Visual Acuity Equations

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High Technology Letters 2001年第2期7卷 14-18页

作者：纪庆革 Hong Bingrong Wang Dongmu Department of Computer Science Engineering Harbin Institute of Technology Beijing Simulation Center

A new method of adaptable rendering for interaction in Virtual Environment(VE) through different visual acuity equations is proposed. An acuity factor equation of luminance vision is first given. Secondly, five equations which calculate the visual acuity through visual acuity factors are presented, and adaptive rendering strategy based on different visual acuity equations is given. The VE system may select one of them on the basis of the host’s load, hereby select LOD for each model which would be rendered. A coarser LOD is selected where the visual acuity is lower, and a better LOD is used where it is higher. This method is tested through experiments and the experimental results show that it is effective.

关键词： Visual acuity Visual acuity factor Adaptive rendering Levels of detail (LOD) Virtual environments (VEs)

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Adaptive sampling for network management

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Journal of Network and Systems Management 2001年第4期9卷 409-434页

作者： Hernandez, Edwin A. High-performance Computing and Simulation (HCS) Research Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL 32611-6200 P.O. Box 116200 United States

High-performance networks require sophisticated management systems to identify sources of bottlenecks and detect faults. At the same time, the impact of network queries on the latency and bandwidth available to the applications must be minimized. Adaptive techniques can be used to control and reduce the rate of sampling of network information, reducing the amount of processed data and lessening the overhead on the network. Two adaptive sampling methods are proposed in this paper based on linear prediction and fuzzy logic. The performance of these techniques is compared with conventional sampling methods by conducting simulative experiments using Internet and videoconference traffic patterns. The adaptive techniques are significantly more flexible in their ability to dynamically adjust with fluctuations in network behavior, and in some cases they are able to reduce the sample count by as much as a factor of two while maintaining the same accuracy as the best conventional sampling interval. The results illustrate that adaptive sampling provides the potential for better monitoring, control, and management of high-performance networks with higher accuracy, lower overhead, or both. © 2001 Plenum Publishing Corporation.

关键词： Adaptive sampling Fuzzy logic Linear prediction Network management SNMP

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A comparative analysis of dependence testing mechanisms 1

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13th International Workshop on Languages and Compilers for Parallel Computing, LCPC 2000

作者： Hoeflinger, Jay Paek, Yunheung Center for Simulation of Advanced Rockets University of Illinois at Urbana-Champaign United States Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Korea Republic of

ISBN: (数字)9783540455745

ISBN: (纸本)3540428623

The internal mechanism used for a dependence test constrains its accuracy and determines its speed. So does the form in which it represents array subscript expressions. The internal mechanism and representational form used for our Access Region Test (ART) is different from that used in any other dependence test, and therefore its constraints and characteristics are likewise different. In this paper, we briefly describe our descriptor for representing memory accesses, the Linear Memory Access Descriptor (LMAD) and the ART. We then describe the LMAD intersection algorithm in some detail. Finally, we compare and contrast the mechanisms of the LMAD intersection algorithm with the internal mechanisms for a number of prior dependence tests. © Springer-Verlag Berlin Heidelberg 2001.

关键词： computers

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DEVS modeling and simulation: A new layer of middleware 3

DEVS modeling and simulation: A new layer of middleware

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3rd Annual International Workshop on Active Middleware Services, AMS 2001

作者： Zeigler, B.P. Sarjoughian, H.S. Park, Sunwoo Nutaro, J.J. Lee, J.S. Cho, Y.K. Arizona Center for Integrative Modeling and Simulation Electrical and Computer Engineering Department University of Arizona TucsonAZ85721-0104 United States Raytheon Missile Systems TucsonAZ United States

ISBN: (纸本)0769515282

This paper discusses a concept of DEVS middleware that would provide a set of services for constructing discrete event models and executing them in simulation or in real-time. Although generic middleware such as CORBA and MPI supports simulation and simulation-oriented middleware such as High Level Architecture Runtime Infrastructure exists, there are many issues that either not addressed at all or have been inadequately addressed in existing systems. DEVS Middleware would improve modeling and simulations due to the beneficial formal properties of DEVS, enhance interoperability among components adhering to the DEVS protocol, and reduce programming complexity by hiding lower level simulation and execution details. The DEVS Middleware concept includes components for model construction and for mapping models onto simulators or real-time execution engines to support the novel concept of "distributed programming by modeling." This paper discusses several sub-layers that have been identified within the overall DEVS middleware concept, existing work that can be brought to bear on developing these layers and the integration needed to create a widely accepted standard. © 2001 IEEE.

关键词： Middleware

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Gossip-Style Failure Detection and Distributed Consensus for Scalable Heterogeneous Clusters

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Cluster Computing 2001年第3期4卷 197-209页

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

Gossip protocols 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. However, in order to be effective with application recovery and reconfiguration, these protocols require mechanisms by which failures can be detected with system-wide consensus in a scalable fashion. This paper presents three new gossip-style protocols supported by a novel algorithm to achieve consensus in scalable, heterogeneous clusters. The round-robin protocol improves on basic randomized gossiping by distributing gossip messages in a deterministic order that optimizes bandwidth consumption. Redundant gossiping is completely eliminated in the binary round-robin protocol, and the round-robin with sequence check protocol is a useful extension that yields efficient detection times without the need for system-specific optimization. The distributed consensus algorithm works with these gossip protocols to achieve agreement among the operable nodes in the cluster on the state of the system featuring either a flat or a layered design. The various protocols are simulated and evaluated in terms of consensus time and scalability using a high-fidelity, fault-injection model for distributed systems comprised of clusters of workstations connected by high-performance networks.

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Analysis of feasibility for real time simulation of RT-DEVs models

Analysis of feasibility for real time simulation of RT-DEVs ...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Seong Myun Cho Tag Gon Kim Department of Electrical Engineering & Computer Science KAIST Systems Modeling Simulation Laboratories Daejeon South Korea

Real time simulation has time constraints within which certain model execution has to be completed. Such simulation usually has interactions with a surrounding environment, such as software components, hardware components or human operators. A proper scheduling policy for model execution and an associated method for feasibility analysis of real time execution are needed. This paper proposes a scheduling policy and its feasibility analysis method for real time discrete event system specification (RT-DEVS) models. The proposed analysis method consists of two phases: synchronization analysis and feasibility analysis. The former checks if the model specifications are consistent with their interactions. The latter examines feasibility for real time simulation of a given model under the proposed scheduling policy and a given hardware resource.

关键词： Analytical models Object oriented modeling Timing Real time systems Computational modeling computer simulation Hardware Yarn Kernel Scheduling

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Integrating the evolving modern cockpit

Integrating the evolving modern cockpit

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AIAA Guidance, Navigation, and Control Conference and Exhibit 2001

作者： Painter, John H. Valasek, John Ward, Donald T. Departments of Aerospace Engineering Electrical Engineering and Computer Science Texas A and M University College Station TX 77843-3141 United States Flight Simulation Laboratory Department of Aerospace Engineering Texas A and M University College Station TX 77843-3141 United States Department of Aerospace Eng. Texas A and M University College Station TX 77843-3141 United States

ISBN: (纸本)9781563479786

This paper applies to Free Flight some lessons learned from ten years of investigation into computing in the modern cockpit. Early efforts concluded that Artificial Intelligence was better suited to Flight Management and Pilot Decision Support than to aircraft control. Later efforts produced an Al-based cockpit software decision system for inferring current flight operation without querying the pilot. That decision system was used to drive adaptive displays and a rule-based Pilot Advisor. This prior work implemented a state of the art fixed-base engineering flight simulator, whose software was favorably evaluated by a team of pilots. Currently, an innovative Flight Management System is being implemented, based on cooperating software agents. The technology focus is not just on hardware but on the software that can integrate new Free Flight functionality, in terms of increasing pilot situational awareness, while not increasing his workload. Software methods integrate data from multiple sources, dealing with weather, traffic, terrain, and route. Such data fusion results in an integrated, pilot-centered, smart guidance and display system. © 2001 by John H. Painter.

关键词： Flight simulators

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