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10th IEEE international Symposium on distributed simulation and real-time applications

作者： Marshall, Damien McLoone, Seamus Delaney, Declan Ward, Tomas Natl Univ Ireland Maynooth Maynooth Kildare Ireland

ISBN: (纸本)0769526977

Collaboration within a distributed interactive Application (DIA) requires that a high level of consistency be maintained between remote hosts. However, this can require large amounts of network-resources, which can negatively affect the scalability of the application, and also increase network, latency. Predictive models, such as dead reckoning, provide a sufficient level of consistency, whilst reducing network-requirements. Dead reckoning traditionally uses a spatial error threshold metric to operate. In previous work, it was shown how the use of the spatial threshold could result in potentially unbounded local absolute inconsistency. To remedy this, a novel time-space threshold was proposed, that placed bounds on local absolute inconsistency. However, use of the time-space threshold could result in. unacceptably large spatial inconsistency. A hybrid approach that combined both error threshold measures was then shown to place bounds on both levels of inconsistency. However, choosing suitable threshold values for use within the hybrid scheme has been problematic, as no direct comparisons can be made between the two threshold metrics. In this paper, a novel comparison scheme is proposed. Under this approach, an error threshold look-up table is generated, based on entity speed and equivalent inconsistency measures. Using this look-lip table, it is shown how the performance of comparable thresholds is equal on average,from the point of view of network, packet generation. These error thresholds are then employed in a hybrid threshold scheme, which is shown to improve overall consistency, in comparison to the previous solution of simply using numerically equal threshold values.

关键词： Dead reckoning Table lookup Scalability Delay Predictive models Collaboration Velocity measurement Error correction Telecommunication traffic Traffic control

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Embedded systems design using optimistic distributed simulation of colored Petri nets

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7th international workshop on Embedded Systems - Modeling, Technology and applications

作者： Knoke, Michael Rasinski, Dawid Hommel, Guenter Tech Univ Berlin Real Time Syst & Robot Berlin Germany

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A real-time interactive Web-based environment for training

A real-time interactive Web-based environment for training

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international Conference on Modeling and simulation - Methodology, Tools, Software applications 2006, M and S-MTSA 2006, Part of the 2006 Summer simulation Multiconference, SummerSim 2006

作者： Rajaei, Hassan Barnes, Andrew Department of Computer Science Bowling Green State University Bowling Green OH 43403 United States

ISBN: (纸本)9781622763542

The World Wide Web and the emergence of advanced tools lead to an increase in the quality and quantity of web-based applications. One such is Web-Based simulation (WBS). In this paper, the web is used as the communication media to create a Virtual Training Environment (VTE) exploiting an Advanced Distance Learning (ADL) framework for training and educational purposes. A parallel and distributed simulation engine is integrated into the system which establishes a distributed web-based simulation empowering the platform with cluster and grid computing. Through digital audio and video streams, the participants are interacting in real-time in the virtual lab and collaboratively work on their training agenda. This environment is synchronous requiring the students to join the class at specific time similar to a typical classroom. Key challenges in this system include scalability, communications delays, security, and synchronization. This paper provides an overview of the system as well as how the real-time interaction could be integrated in the distributed web-based virtual training environment. Further, we examine several existing commercial tools as potential candidates for integration in the system. Since all of these tools have their strengths and limitations, we conclude a tailor-made homegrown solution might be more desirable.

关键词： Grid computing

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Creating dynamic logical overlay networks for distributed simulations

Creating dynamic logical overlay networks for distributed si...

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Fall simulation Interoperability workshop 2006

作者： LiaBraaten, Lane G. McKeon, Ryan T. Gestalt LLC 9432 Baymeadows Road Jacksonville FL 32256 United States

ISBN: (纸本)9781622761425

simulation resources are located on private networks belonging to both commercial enterprises and military installations around the globe. Distinct parties wish to have their applications communicate as if they were on a single broadcast domain, but are unwilling to sacrifice security and anonymity. Valuable hardware, software, and personnel resources are duplicated or underutilized while these issues are negotiated and the proper environments are provisioned. Allowing these systems to communicate on demand would require the ability to dynamically construct an overlay network-rapidly and without manual hardware configuration-while maintaining security. By viewing the simulations as endpoints in a conference call, the Session Initiation Protocol (SIP) is leveraged to establish secure tunnels between enterprises. The distributed interactive simulation (DIS) traffic is wrapped inside real-time Transport Protocol (RTP) packets, enabling traversal of enterprise boundaries by supplementing existing firewalls and network security with SIP-enabled firewalls. In this paper is a discussion of the provisioning of dynamic overlay networks, the security benefits they provide, and applications of these technologies.

关键词： Overlay networks

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Automated distribution of UML 2.0 designed applications to a configurable multiprocessor platform

Automated distribution of UML 2.0 designed applications to a...

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6th international workshop on Embedded Computer Systems - Architectures, Modeling and simulation

作者： Setala, Mikko Kukkala, Petri Arpinen, Tero Hannikainen, Marko Hamalainen, Timo D. Tampere Univ Technol Inst Digital & Comp Syst FI-33101 Tampere Finland

ISBN: (纸本)3540364102

This paper presents automated distribution of embedded real-time applications modeled in Unified Modeling Language version 2.0 (UML 2.0). The automated distribution requires methods and tools for design automation, as well as the run-time environment for the distributed execution on the target platform. Executable application code is generated from UML models, and UML with a custom profile is used to abstract hardware architecture and configure application mapping. For experimenting, a full featured WLAN terminal was designed in UML and implemented as a distributed multiprocessor system-on-chip (SoC) on an FPGA prototype platform. Measurements show that a 50-70% reduction in protocol delays is achived with distribution, and delay variations are reduced 45-85%.

关键词： Computer applications

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European simulation Interoperability workshop 2006

European Simulation Interoperability Workshop 2006

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European simulation Interoperability workshop 2006

ISBN: (纸本)9781622761432

The proceedings contain 45 papers and 1 PowerPoint presentation. The topics discussed include: expanding the management language smorgasbord towards standardization of crisis management language (CML);pathfinder integration environment - knowledge and resources documentation enabling efficient reuse;future database generation: from where will the data come?;an approach to intelligent decision making in computer generated forces;component-based software reuse strategy for army live training ranges;DIS attributes - the final bridge to HLA is crossed;constructive simulation reuse for international applications or when cots is what you gots;implementing a low cost distributed architecture for real-time behavioral modeling and simulation;Spanish HLA abstraction layer: towards a higher interoperability model for national simulators;simware: new simulation technologies for training and rehearsal of real;and simware-kernel real time communication system for simulation.

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Optimal rate-oriented routing for distributed source coding in wireless sensor network

Optimal rate-oriented routing for distributed source coding ...

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Q2SWinet 2006: 2nd ACM international workshop on Quality of Service and Security in Wireless and Mobile Networks

作者： Wang, Honggang Peng, Dongming Wang, Wei Sharif, Hamid Computer and Electronics Engineering University of Nebraska-Lincoln Omaha NE United States

ISBN: (纸本)1595934863

Recent Advances in distributed Source Coding (DSC) motivate the mission-driven wireless sensor network application that relates to compression of multiple correlated sensor outputs, such as real time target tracking and environment monitoring. The characteristic of multiple rates in DSC applications requires the associated sensor network to support Rate-Oriented Routing (ROR) in order to extend the network life time. In this paper, we propose a novel optimal Rate-Oriented Routing based on the distributed Energy Usage Scheduling (DEUS) for mission-driven DSC applications. The ROR adopts a new method called rate assignment instead of the traditional rate adaptation method in wireless networks to extend the network life time. The maximum network lifetime is achieved by constructing multiple rate-oriented paths between the source and sink, which balance the loads and lead to energy-efficient transmissions to meet the DSC application needs. Our simulation has shown that the Rate-Oriented Routing can extend the network life time and save energy significantly under the DSC application requirements. Copyright 2006 ACM.

关键词： Routing protocols

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Supporting modeling and simulation interoperability standards within ESRI ArcGIS

Supporting modeling and simulation interoperability standard...

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Fall simulation Interoperability workshop 2006

作者： Spaulding, Brian Morales, Jorge Fidelman, Miles MÄK Technologies 68 Moulton Street Cambridge MA 02138 United States

ISBN: (纸本)9781622761425

distributed simulations are widely used for training, system concept evaluation, and increasingly for operational uses such as embedded training, course of action analysis, mission planning, mission rehearsal, and predictive situational awareness. The distributed interactive simulation (DIS) and High Level Architecture (HLA) are the DoD standard protocols used to link together distributed simulations. These simulations typically have requirements to visualize rapidly-updating, geographically-referenced data that is shared via DIS or HLA or TENA. The Commercial Joint Mapping Tool Kit (C/JMTK) acquisition program provides the underlying toolkit that will be deployed to support both legacy Mission applications and new systems being developed throughout the DoD C4I Community. At the core of C/JMTK is the ESRI ArcGIS geographic information system. In order to effectively combine the simulation and operational environments, we need to provide seamless mechanisms to display 2D MOLE symbology in ArcMap and display 3D models in ArcGlobe that correspond to the simulated objects. In addition, these simulations may use geographic data analysis as part of implementing behaviors for computer-generated objects, requiring seamless access to the geo-database and geo-processing tools and the ability to publish these objects via DIS or HLA or TENA. In this paper, we discuss requirements and approaches for integrating DIS, HLA, and TENA into ArcGIS-based systems, to allow simulated entities to be rapidly displayed and manipulated. This will include a description of the approach used and the lessons learned while incorporating real-time updates into the ArcGIS product framework.

关键词： Geographic information systems

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Automating the display of third person/stealth views of virtual environments

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PRESENCE-VIRTUAL AND AUGMENTED realITY 2006年第6期15卷 717-739页

作者： Kalawsky, Roy Simpkin, Graeme Univ Loughborough Res Sch Syst Engn Leicester Leics England

In order to gain a greater insight into the relationships that exist between entities in three-dimensional (3D) datasets, the scientific, engineering, and arts communities are increasingly using interactive visualization and virtual reality (VR) techniques. They have realized that inter-actively visualizing 3D datasets from different viewpoints makes it possible to achieve a better understanding of the underlying dataset structure. Viewpoints can be either static or dynamic as in an interactive fly-through. However, unskilled users often select flight paths (or viewing situations) that cause nauseous effects that detrimentally distract the user from the task at hand. Interactions between multiple users or virtual agents in a virtual environment present further challenges because it is necessary for the user to monitor multiple activities concurrently. If the user has to make decisions based on what is taking place in a complex virtual environment, then it is very important that correct and appropriate viewpoints are maintained. For example, flight simulator debriefing tools require first and third person viewing so that the actions that have taken place can be understood. In these situations there is a need to select multiple viewpoints for each participant. Consequently (because of the high cognitive load), maintaining control over a number of different viewpoints is very challenging. Within this paper the authors describe the real-time automatic display controller they have developed for third person/stealth views of a multi-participant virtual environment-where it is important for users to gain a global and localized understanding of the tasks being performed. They discuss important cinematic conventions and how these are set in the context of characterizing a 3D communication medium, as well as determining their role for optimal viewing parameters. The real time automatic display controller is of particular benefit to applications such as scientific visualizatio

关键词： THREE-dimensional imaging VIRTUAL reality HUMAN-computer interaction interactive multimedia FLIGHT simulators COMPUTER simulation

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Embedded Computer Systems: Architectures, Modeling, and simulation - 6th international workshop, SAMOS 2006, Proceedings

Embedded Computer Systems: Architectures, Modeling, and Simu...

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6th international workshop on Architectures, Modeling, and simulation, SAMOS 2006

ISBN: (纸本)3540364102

The proceedings contain 48 papers. The topics discussed include: reconfigurable platform for digital convergence terminals;European research in embedded systems;interface overheads in embedded multimedia software;automated distribution of UML 2.0 designed applications to a configurable multiprocessor platform;key research challenges for successfully applying MDD within real-time embedded software development;domain-specific modeling of power aware distributed real-time embedded systems;mining dynamic document spaces with massively parallel embedded processors;designing wireless sensor nodes;design, implementation, and experiment on outdoor deployment of wireless sensor network for environmental monitoring;energy-driven partitioning of signal processing algorithms in sensor networks;security in wireless sensor networks: considerations and experiments;on security of PAN wireless systems;and code size reduction by compiler tuning.

关键词： Computer systems

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