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An auto-adaptive dead reckoning algorithm for distributed interactive simulation

An auto-adaptive dead reckoning algorithm for distributed in...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： Wentong Cai F.B.S. Lee L. Chen School of Applied Science Nanyang Technological University Singapore

This paper describes a new, auto-adaptive algorithm for dead reckoning in DIS. In general dead-reckoning algorithms use a fixed threshold to control the extrapolation errors. Since a fixed threshold cannot adequately handle the dynamic relationships between moving entities, a multi-level threshold scheme is proposed. The definition of threshold levels is based on the concepts of area of interest (AOI) and sensitive region (SR), and the levels of threshold are adaptively adjusted based on the relative distance between entities during the simulation. Various experiments were conducted. The results show that the proposed auto-adaptive dead reckoning algorithm can achieve considerable reduction in update packets without sacrificing accuracy in extrapolation.

关键词： Dead reckoning Extrapolation Error correction Standards development Equations Adaptive filters Filtering Adaptive algorithm Joining processes Large-scale systems

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Active Virtual Network Management Protocol

Active Virtual Network Management Protocol

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： S.F. Bush General Electric Corporate Research and Development Center Niskayuna NY USA

This paper introduces a novel algorithm, the Active Virtual Network Management Protocol (AVNMP), for predictive network management. It explains how the Active Virtual Network Management Protocol facilitates the management of an active network by allowing future predicted state information within an active network to be available to network management algorithms. This is accomplished by coupling ideas from optimistic discrete event simulation with active networking. The optimistic discrete event simulation method used is a form of self-adjusting Time Warp. It is self-adjusting because the system adjusts for predictions which are inaccurate beyond a given tolerance. The concept of a streptichron and autoanaplasis are introduced as mechanisms which take advantage of the enhanced flexibility and intelligence of active packets. Finally, it is demonstrated that the Active Virtual Network Management Protocol is a feasible concept.

关键词： Protocols Communication networks Communication system security Information security Research and development management Discrete event simulation Information management Computer networks Computer network management Quality management

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An approach for stream transmission over HLA-RTI in distributed Virtual Environments 3

An approach for stream transmission over HLA-RTI in Distribu...

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3rd IEEE International workshop on distributed Interactive simulation and Real-Time Applications, DiS-RT 1999

作者： Zhao, Hui Georganas, Nicolas D. Multimedia Communication Research Laboratory School of Information Technology and Engineering University of Ottawa Canada

ISBN: (纸本)0769504590

The HLA-RTI provides a general-purpose network communications mechanism for distributed Virtual Environments (DVE) but does not provide a stream transmission mechanism directly. This paper introduces a solution for stream transmission over RTI. This solution uses RTI-APIs sendInteraction() and receiveInteraction() to transfer stream data and uses the operating system interval timer to control schedule. An audio retrieve application is illustrated as an experiment with performance analysis. Finally, as a discussion, an architecture of videoconference federates based on this approach is introduced. © 1999 IEEE.

关键词： Virtual reality

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Beyond speedup: PADS, the HLA and Web-based simulation 99

Beyond speedup: PADS, the HLA and Web-based simulation

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Ernest H. Page The MITRE Corporation 1820 Dolley Madison Boulevard McLean VA

This year's installment of the PADS "community assessment" looks at previous assessments and considers some current directions in distributed simulation and their possible relationship to PADS.

ISBN: (纸本)9780769501550

This year's installment of the PADS "community assessment" looks at previous assessments and considers some current directions in distributed simulation and their possible relationship to PADS.

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Generic framework for parallelization of network simulations

Generic framework for parallelization of network simulations

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proceedings of the 1999 7th International Symposium on Modeling, Analysis and simulation of Computer and Telecommunication Systems - MASCOTS '99

作者： Riley, George F. Fujimoto, Richard M. Ammar, Mostafa H. Georgia Inst of Technology Atlanta United States

Discrete event simulation is widely used within the networking community for purposes such as demonstrating the validity of network protocols and architectures. Depending on the level of detail modeled within the simulation, the running time and memory requirements can be excessive. The goal of our research is to develop and demonstrate a practical, scalable approach to parallel and distributed simulation that will enable widespread reuse of sequential network simulation models and software. We focus on an approach to parallelization where an existing network simulator is used to build models of subnetworks that are composed to create simulations of larger networks. Changes to the original simulator are minimized, enabling the parallel simulator to easily track enhancements to the sequential version. In this paper we describe our lessons learned in applying this approach to the publicly available ns software package, and converting it to run in a parallel fashion on a network of workstations. This activity highlights a number of important problems, from the standpoint of how to parallelize an existing serial simulation model and achieving acceptable parallel performance.

关键词： Computer simulation

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Efficient optimistic parallel simulations using reverse computation

Efficient optimistic parallel simulations using reverse comp...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： C.D. Carothers K.S. Perumalla R.M. Fujimoto Department of Computer Science Rensselaer Polytechnic Institute Troy NY USA College of Computing Georgia Institute of Technology Atlanta GA USA

In optimistic parallel simulations, state-saving techniques have been traditionally used to realize rollback. We propose reverse computation as an alternative approach, and compare its execution performance against that of state-saving. Using compiler techniques, we describe an approach to automatically generate reversible computations, and to optimize them to transparently reap the performance benefits of reverse computation. For certain fine-grain models, such as queuing network models, we show that reverse computation can yield significant improvement in execution speed coupled with significant reduction in memory utilization, as compared to traditional state-saving. On sample models using reverse computation, we observe as much as three-fold improvement in execution speed over traditional state-saving.

关键词： Computational modeling Concurrent computing Computer science Educational institutions Optimizing compilers Computer networks Discrete event simulation Loss measurement Delay

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Performance prediction tools for parallel discrete-event simulation

Performance prediction tools for parallel discrete-event sim...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： Chu-Cheow Lim Yoke-Hean Low Boon-Ping Gan Sanjay Jain Wentong Cai Wen Jing Hsu Shell Ying Huang Gintic Institute of Manufacturing Technology Singapore Singapore Centre for Advanced Information Systems School of Applied Science Nanyang Technological University Singapore Singapore

We have developed a set of performance prediction tools which help to estimate the achievable speedups from parallelizing a sequential simulation. The tools focus on two important factors in the actual speedup of a parallel simulation program: the simulation protocol used; and the inherent parallelism in the simulation model. The first two tools are a performance/parallelism analyzer for a conservative, asynchronous simulation protocol, and a similar analyzer for a conservative, synchronous (super-step) protocol. Each analyzer allows us to study how the speedup of a model changes with increasing number of processors, when a specific protocol is used. The third tool-a critical path analyzer-gives on ideal upper bound to the model's speedup. This paper gives an overview of the prediction tools, and reports the predictions from applying the tools to a discrete-event wafer fabrication simulation model. The predictions are close to speedups from actual parallel implementations. These tools help us to set realistic expectations of the speedup from a parallel simulation program, and to focus our work on issues which are more likely to yield performance improvement.

关键词： Discrete event simulation Protocols Read only memory Context modeling Gallium nitride Manufacturing Information systems Upper bound Electrical capacitance tomography Atherosclerosis

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Optimism: not just for event execution any more

Optimism: not just for event execution any more

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： C.H. Young R. Radhakrishnan P.A. Wilsey Department of ECECS University of Cincinnati Cincinnati OH USA

Optimism is a technique used by the Time Warp paradigm to make decisions about event execution under uncertainty. While the benefits of throttling the optimism of Time Warp have been studied, the benefits of extending optimism to operations besides event execution are presented. Specifically, we discuss how optimism can be mapped to fossil collection which has traditionally been assumed to be a non-recoverable operation that must be performed under global control. Optimistic Fossil Collection (OFC) is a technique for fossil collection that does not require global control. However, as states are fossil collected optimistically, a recovery mechanism is required to recover from errors. Performance results show that Time Warp using OFC can improve the performance of simulations on a network of workstations. Another benefit of OFC is that the simulation checkpoints provide for fault tolerance in more than just fossil collection.

关键词： Time warp simulation Uncertainty Optimization methods Protocols Workstations Fault tolerant systems Discrete event simulation Contracts Checkpointing Memory management

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distributed interactive learning environment 3

Distributed interactive learning environment

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3rd IEEE International workshop on distributed Interactive simulation and Real-Time Applications, DiS-RT 1999

作者： Chen, J.X. Dede, C.J. Fu, Xiaodong Yang, Yonggao Comput. Graphics Lab. George Mason Univ. FairfaxVA United States

ISBN: (纸本)0769504590

We present strategies and approaches used to implement a synthetic learning environment which includes networking, distributed interactive simulation, physically-based modeling, computational steering, and virtual reality for learning abstract scientific concepts. The resulting technology is a testbed that reflects the benefits of a schoolhouse for training and education, especially for learning scientific abstract concepts. Students are allowed to interact with one another and engage in realistic collaborative exercises. Our network architecture and protocol allow the interactive networked environment to be much more scalable. Our innovative use of computational steering and interactive visualization allows students to visualize and manipulate the physical process, and understand the abstract concept much easier. We use fluid dynamics as a case study to demonstrate this learning environment. © 1999 IEEE.

关键词： Students

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Scheduling critical channels in conservative parallel discrete event simulation

Scheduling critical channels in conservative parallel discre...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： Z. Xiao B. Unger R. Simmonds J. Cleary Computer Science Department University of Calgary Canada Comuter Science Department University of Waikato New Zealand

This paper introduces the Critical Channel Traversing (CCT) algorithm, a new scheduling algorithm for both sequential and parallel discrete event simulation. CCT is a general conservative algorithm that is aimed at the simulation of low-granularity network models on shared-memory multiprocessor computers. An implementation of the CCT algorithm within a kernel called TasKit has demonstrated excellent performance for large ATM network simulations when compared to previous sequential, optimistic and conservative kernels. TasKit has achieved two to three times speedup on a single processor with respect to a splay tree central-event-list based sequential kernel. On a 16 processor (R8000) Silicon Graphics PowerChallenge, TasKit has achieved an event-rate of 1.2 million events per second and a speedup of 26 relative to the sequential kernel for a large ATM network model. Performance is achieved through a multi-level scheduling scheme that supports the scheduling of large grains of computation even with low-granularity events. Performance is also enhanced by supporting good cache behavior and automatic load balancing. The paper describes the algorithm and its motivation, proves its correctness and briefly presents performance results for TasKit.

关键词： Kernel Processor scheduling Scheduling algorithm Computational modeling Discrete event simulation Computer simulation Computer networks Tree graphs Silicon Graphics

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