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international workshop on Image Analysis for Multimedia interactive Services, WIAMIS

作者： Fons de Lange Jan Nesvadba Johan Lukkien Philips Research Eindhoven Netherlands Eindhovan University of Technology Netherlands

Connected Consumer Electronics (CE) devices face an exponential growth in storage, processing capabilities and connectivity bandwidth. This increased complexity calls for new software architectures that naturally admit self-organization, resource management for efficient workload distribution, and a transparent cooperation of connected CE-terminals. The interconnected nature makes advanced applications feasible such as the smart distribution of complex multimedia content analysis algorithms, resulting in automatic semantic content-awareness creation. In this paper we describe a modular, self-aware, self-organizing, real-time and distributed multimedia content analysis system. Based on a Service Oriented Architecture it is, furthermore, capable of efficiently and dynamically using the available resources in a grid-like manner.

关键词： Engines Consumer electronics Face Bandwidth Software architecture Resource management Application software Algorithm design and analysis real time systems Multimedia systems

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Detailed simulation of Large-Scale Wireless Networks 07

Detailed Simulation of Large-Scale Wireless Networks

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international workshop/Symposium on distributed simulation and real-time applications (DS-RT)

作者： Michele Bracuto Gabriele D'Angelo Dipartimento di Scienze dell'Informazione Università di Bologna Bologna Italy Universita di Bologna Bologna Emilia-Romagna IT

ISBN: (纸本)9780769530116

In this paper, we present WiFra, a new framework for the detailed simulation of very large-scale wireless networks. WiFra is based on the parallel and distributed simulation approach and provides high scalability in terms of size of simulated networks and number of execution units running the simulation. In order to improve the performance of distributed simulation, additional techniques are proposed. Their aim is to reduce the communication overhead and to maintain a good level of load-balancing. simulation architectures composed of low-cost Commercial-Off-The-Shelf (COTS) hardware are specifically supported by WiFra. The framework dynamically reconfigures the simulation, taking care of the performance of each part of the execution architecture and dealing with unpredictable fluctuations of the available computation power and communication load on the single execution units. A fine-grained model of the 802.11 DCF protocol has been used for the performance evaluation of the proposed framework. The results demonstrate that the distributed approach is suitable for the detailed simulation of very-large scale wireless networks.

关键词： Large-scale systems Wireless networks Computational modeling Scalability Computer architecture Electronic mail Hardware Fluctuations Protocols Memory management

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A Visibility-Driven Approach to Managing Interest in distributed simulations with Dynamic Load Balancing 07

A Visibility-Driven Approach to Managing Interest in Distrib...

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international workshop/Symposium on distributed simulation and real-time applications (DS-RT)

作者： Ihab Kazem Dewan Tanvir Ahmed Shervin Shirmohammadi Distributed & Collaborative Virtual Environments Research Laboratory University of Ottawa Ottawa ONT Canada

ISBN: (纸本)9780769530116

distributed simulations that support a massive number of users typically divide the virtual world into zones that are managed by separate servers to evenly distribute resources and achieve scalability. However, such zoning restricts cross-zonal interactions and exposes the division of the world to the participating parties. Problems such as crowding one zone among others defeats the very purpose of interest management and makes geographic partitioning inefficient for modeling interactions. In this work, we have designed and implemented a visibility-driven approach to make the partitioning transparent to users. The effectiveness of this distributed architecture is tested through a prototype implementation. We also introduce a novel idea to dynamic load balancing that can be achieved in real-time without modifying the communication architecture. By increasing the granularity of the partitioning and providing a layered approach to zoning, transient crowding can be handled by adoptively dispersing parts of the crowded zone to adjacent servers.

关键词： Load management Scalability Resource management Computational modeling Delay Environmental management Technology management Engineering management Collaboration Internet

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An Open and Scalable Emulation Infrastructure for Large-Scale real-time Network simulations

An Open and Scalable Emulation Infrastructure for Large-Scal...

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： J. Liu S. Mann N. Van Vorst K. Hellman Department of Mathematical and Computer Sciences Colorado Schml of Mines Golden CO USA

We present a software infrastructure that embeds physical hosts in a simulated network. Aiming to create a large-scale real-time virtual network testbed, our real-time interactive simulation approach combines the advantages of both simulation and emulation, by maintaining flexibility of the simulation models and increasing fidelity as real systems are included in the simulation. In our approach, real-world distributed applications and network services can run together with the real-time simulator; real packets are injected into the simulation and subject to the simulated network conditions computed as a result of both real and virtual traffic competing for network resources. A prototype of the proposed emulation infrastructure has been implemented based on virtual private network (VPN). One distinct advantage of our approach is that it does not require special hardware. Furthermore, it is flexible, secure, and scalable-attributes inherited directly from the VPN implementation. We conducted a set of preliminary experiments to assess the performance limitations of our emulation infrastructure. We also present an interesting case study to demonstrate the capability of our approach.

关键词： Emulation Large-scale systems Computational modeling Virtual private networks real time systems Embedded software System testing Computer networks distributed computing Telecommunication traffic

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A Dominating Set Based Peer-to-Peer Protocol for real-time Multi-source Collaboration

A Dominating Set Based Peer-to-Peer Protocol for Real-Time M...

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IEEE international workshop on Enabling Technologies: Infrastructure for Collaborative Enterprises (WET ICE)

作者： Dewan Tanvir Ahmed Shervin Shirmohammadi Abdulmotaleb El Saddik Distributed and Collaborative Virtual Environments Research Laboratory University of Ottawa ON Canada

Designing a collaborative architecture for real-time applications is an intricate challenge that usually involves dealing with the real-time constraints, resource limitations and complex synchronous problems. In multi-source collaboration applications, users interact with each other to share their states which are essential for synchronous communication. In this paper, we present real-time multi-participant communication architecture to efficiently manage their interactions in a peer-to-peer fashion. We introduce a graph-theoretic framework for provisioning overlay network based collaboration services to heterogeneous receivers. Considering resource limitations and exploiting geographical positions, the protocol greedily builds degree-constrained minimum-cost connected graph to manipulate the topology to a significant extent by selecting mesh neighbors and changing the metrics. Data delivery routes are picked using dominating set. We named it dominating set based peer-to-peer protocol (DS-P2P). simulation is used to manifest that the framework is robust, responsive to tree partitions, and suitable for multi-participant real-time collaboration.

关键词： Peer to peer computing Protocols Collaboration Videoconference Tree graphs Internet telephony Video sharing Delay Video on demand Virtual environment

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UBCA: Utility-Based Clustering Architecture for Peer-to-Peer Systems

UBCA: Utility-Based Clustering Architecture for Peer-to-Peer...

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international Conference on distributed Computing Systems workshop

作者： Brent Lagesse Mohan Kumar Department of Computer Science Engineering University of Texas Arlington USA

Peer-to-peer (P2P) systems are currently used in a variety of applications. File sharing applications and ad hoc networking have fueled the usage of these systems. P2P systems generate new challenges in scalability, fairness, and quality of service. Current systems often approach these challenges through incentive-based solutions and structured system design. Incentive-based solutions appeal to the self-interested nature of peers by utilizing payment or penalty to encourage peers to contribute to the system. System design principles, which attempt to improve performance through protocols and system-algorithms, include distributed hash tables and graph-theoretic designs. These approaches have seen some success, but also result in new problems such as overhead costs of authenticity/security for incentives, increased centralization, and decreased ability to handle dynamic peers. We introduce Utility-Based Clustering Architecture, (UBCA) designed to improve quality of service through the use of implicit incentives. UBCA runs on peers and groups them into logical clusters in real time, based on mutual utility gained as a result of the grouping. simulation studies show with a high confidence that UBCA exhibits improved bandwidth and latency per access.

关键词： Peer to peer computing Application software Costs Computer science Quality of service Bandwidth distributed computing Computer architecture Computational modeling Delay

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Precision Position Tracking in Virtual reality Environments using Sensor Networks

Precision Position Tracking in Virtual Reality Environments ...

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2007 IEEE international Symposium on Industrial Electronics (ISIE 2007), vol.5

作者： Tauseef Gulrez Manolya Kavakli Interactive Systems and Virtual Reality Research Group Department of Computing and Division of ICS Macquarie University Sydney NSW Australia

In an immersive interactive virtual reality (VR) environment a real human can be incorporated into a virtual 3D scene to navigate a robotic device within that virtual scene. This has useful applications in rehabilitation. The non-destructive nature of VR makes it an ideal testbed for many applications and a prime candidate for use in rehabilitation robotics simulation. The key challenge is to accurately localise the movement of the object in reality and map its corresponding position in 3D VR. To solve the localisation problem we have formed an online mode vision sensor network, which tracks the object's real Euclidean position and sends the information back to the VR scene. A precision position tracking (PPT) system has been installed to track the object. We have previously presented the solution to the sensor relevance establishment problem (in [10], [11]) where from a group of sensors the most relevant sensing action is obtained. In this paper we apply the same technique to the VR system. The problem can be broken down in two steps. In step one, the relevant sensor type is discovered based upon the IEEE 1451.4 Transducers Electronic Data Sheets (TEDS) description model. TEDS is used to discover the sensor types, their geographical locations, and additional information such as uncertainty measurement functions and information fusion rules necessary to fuse multi-sensor data. In step two, the most useful sensor information is obtained using the Kullback-Leibler Divergence (KLD) method. In this study we conduct two experiments that address the localisation problem. In the first experiment a VR 3D environment is created using the real-time distributed robotics software Player/Stage/Gazebo and a simulated PPT camera system is used to localise a simulated autonomous mobile robot within the 3D environment. In the second experiment, a real user is placed in a cave-like VR 3D environment and a real PPT camera system is used to localise the user's physical actions in reali

关键词： Virtual reality Layout Robot sensing systems Rehabilitation robotics Mobile robots Robot vision systems Cameras Navigation Human robot interaction Nondestructive testing

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Priority based overlay multicast with filtering mechanism for distributed interactive applications 06

Priority based overlay multicast with filtering mechanism fo...

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

作者： Yu, Jun Chen, Ling Chen, Gen-Cai Zhejiang Univ Coll Comp Sci Hangzhou 310027 Peoples R China Univ Nottingham Sch Comp Sci & IT Nottingham NG7 2RD England

ISBN: (纸本)0769526977

The "priority-based directed minimum? spanning tree" (PST) is designed for distributed interactive applications (DIAs) in which the data are delivered to the receiver node according to their priority;however PST can not balance the bandwidth usage among the nodes and the system will be unstable when its scale, increases. This paper proposes a novel overlay multicast protocol named Priority Based Overlay Multicast (POM), which uses the priority, delay and available bandwidth to construct the multicast tree, besides a filtering mechanism is proposed to rebuild the tree when the available bandwidth shortage appears. The effectiveness of our protocol is demonstrated in the simulation results, showing that POM uses the available bandwidth efficiently, besides it keeps the system stable when its scale increases.

关键词： Filtering Bandwidth Multicast protocols Delay Computer science Video on demand Virtual reality Application software Educational institutions distributed decision making

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A steering environment for online parallel visualization of legacy parallel simulations 06

A steering environment for online parallel visualization of ...

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

作者： Esnard, Aurelien Richart, Nicolas Coulaud, Olivier INRIA Futurs/LaBri France

ISBN: (纸本)0769526977

In the context of scientific computing, the computational steering consists in the coupling of numerical simulations with 3D visualization systems through the network. This allows scientists to monitor online the inter mediate results of their computations in a more interactive way than the batch mode, and allows them to modify the simulation parameters on-the-fly. While most of existing computational steering environments support parallel simulations, they are often limited to sequential visualization systems. This may lead to an important bottleneck and increased rendering time. To achieve the required performance for online visualization, we have designed the EPSN framework, a computational steering environment that enables to interconnect legacy parallel simulations with parallel visualization systems. For this, we have introduced a redistribution algorithm for unstructured data, that is well adapted to the context of M x N computational steering. Then, we focus on the design of our parallel viewer and present some experimental results obtained with a particle-based simulation in astrophysics.

关键词： computational steering numerical simulation data redistribution parallel visualization

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Alternative approaches to multicast group management in large-scale distributed interactive simulation systems

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FUTURE GENERATION COMPUTER SYSTEMS-THE international JOURNAL OF ESCIENCE 2006年第7期22卷 755-763页

作者： Boukerche, Azzedine Dzermajko, Caron Lu, Kaiyuan Univ Ottawa SITE PARADISE Res Lab Ottawa ON K1N 6N5 Canada

A primary concern in implementing and executing large-scale distributed simulations is limiting and controlling the volume of data, regarding simulated entities. exchanged between entities participating in the simulation. Computer scientists in the academic, military and corporate world have spent much time studying and applying various methods of Data Distribution Management (DDM) to learn the strengths and weaknesses of each approach, improve upon existing DDM methods, and discover the most efficient method to use for a particular application. The key to efficient DDM is to successfully limit the data sent to only the data that is needed, and to direct that data to only those entities requiring the data. In this paper, we explain the benefits and goals of DDM, define and describe the various methods of DDM, compare similarities and differences in DDM methods. and discuss several existing DDM implementations. In our discussion of DDM methods, we include Region-Based, Fixed and Dynamic Grid-Based, Hybrid, Agent-Based and Class-Based DDM and compare and contrast these methods and their applications. We also discuss existing High-Level Architecture (HLA)-compliant and non-compliant Run-time Infrastructures (RTI) and their DDM implementations. Our goal is to promote an understanding of the benefits of DDM and to offer a detailed explanation of the available DDM methods and the RTIs that employ those methods. (C) 2006 Published by Elsevier B.V.

关键词： Multicasting

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