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检索条件"任意字段=First IEEE International Conference on Distributed Computing in Sensor Systems, DCOSS 2005"

共 1161 条记录，以下是971-980 订阅

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A comprehensive reputation-based trust model for distributed systems

A comprehensive reputation-based trust model for distributed...

引用

Workshop of the 1st international conference on Security and Privacy for Emerging Areas in Communication Networks, 2005

作者： Tajeddine, Ayman Kayssi, Ayman Chehab, Ali Artail, Hassan Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon

ISBN: (纸本)0780394690

In this paper, we present a general and comprehensive reputation-based trust model for distributed computing. The proposed model is an enhancement over our previous model, TRUMMAR, and aims at achieving a truly unique model that incorporates most concepts that are essential to determining trust-based decisions. Among the concepts upon which the trust model is based are reputation values, direct experiences, trust in the credibility of a host to give recommendations, decay of information with lime based on a dynamic decay factor, first impressions, similarity, popularity, activity, cooperation between hosts, in addition to a hierarchy of host systems. The simulations performed on this model confirm its correctness and its adaptability to different environments and situations. © 2005 ieee.

关键词： distributed computer systems

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A scheduling method for divisible workload problem in grid environments

A scheduling method for divisible workload problem in grid e...

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6th international conference on Parallel and distributed computing, Applications and Technologies, PDCAT 2005

作者： Loc, Nguyen The Elnaffar, Said Katayama, Takuya Bao, Ho Tu Japan Advance Institute of Science and Technology 1-1 Asahidai Nomi Ishikawa 923-1292 Japan College of IT UAE University Al-Ain United Arab Emirates

ISBN: (纸本)0769524052

Scheduling divisible workloads in distributed systems has been one of the interesting research problems over the last few years. Most of the scheduling algorithms previously introduced are based on the master-worker model. However, the majority of these algorithms assume that workers are dedicated machines, which is a wrong assumption in distributed environments such as Grids. In this work, we propose a dynamic scheduling methodology that takes into account the three prominent aspects of Grids: heterogeneity, dynamicity, and uncertainty. Our contribution is threefold. first, we present an analytical model for processing local and Grid tasks at each non-dedicated worker. Second, we present a simple prediction method to forecast the available CPU capacity and bandwidth at each worker. Third, we introduce a dynamic, multi-round scheduling algorithm. © 2005 ieee.

关键词： distributed computer systems

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OpenSPACE: An open service provisioning and consuming environment for grid computing

OpenSPACE: An open service provisioning and consuming enviro...

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1st international conference on e-Science and Grid computing, e-Science 2005

作者： Sun, Hailong Zhong, Liang Huai, Jinpeng Liu, Yunhao School of Computer Science Beihang Univerisity Department of Computer Science Hongkong University of Science and Technology

ISBN: (纸本)0780394631

Our key project, CROWN (China Research and Development Environment Over Wide-area Network), aims to empower in-depth integration of resources and cooperation of researchers nationwide and worldwide using grid technologies. It adopts service oriented architecture. Current service grids do not consider the separation of services and underlying resources, potentially causing low job processing efficiency and resource utilization. In this paper, we propose a novel architecture for grid systems, called Open Service Provisioning and Consuming Environment (OpenSPACE). OpenSPACE is adopted by CROWN and is evaluated by prototype implementation based on real applications. © 2005 ieee.

关键词： distributed computer systems

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Incentive for P2P fair resource sharing

Incentive for P2P fair resource sharing

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5th international conference on Peer-to-Peer computing

作者： Anceaume, E Gradinariu, M Ravoaja, A IRISA Rennes France

ISBN: (纸本)0769523765

We consider the problem of Fair Resource Sharing to optimize the performance of resource sharing in peer to peer systems. Resource sharing systems currently face rational peers which may exhibit a variety of strategies including : no participation, also referred as free-riding, and greedy behavior. The first aspect has been extensively studied in the late years, while the second one has not received much attention. The broad class of proposed solutions focus on designing incentives to reward cooperative peers. The side effect of these incentives is twofold : the system load is not balanced and the resource potential of the system is not fully exploited. The P2P fair resource sharing aims at both balancing the load and maximizing the use of system resources. The contribution of our work is twofold. first, we specify the P2P Fair Resource Sharing problem and propose a mechanism to solve it in large scale dynamic networks with rational users. Our mechanism is composed of a novel incentive (i.e. fair cooperation) and an algorithmic part encapsulated in a middleware layer. Second, we propose an architecture for our mechanism middleware layer including four distributed services that bring together several research area : aggregation, semantic group membership and tracking. Finally, we implement our mechanism using a peer-to-peer unstructured model and evaluate it through simulations.

关键词： distributed computer systems

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Emergency broadcast protocol for inter-vehicle communications

Emergency broadcast protocol for inter-vehicle communication...

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11th international conference on Parallel and distributed systems

作者： Durresi, M Durresi, A Barolli, L Fukuoka Inst Technol Fukuoka Japan

ISBN: (纸本)0769522815

The most important goal in transportation systems is to reduce the dramatically high number of accidents and fatal consequences. One of the most important factors that would make it possible to reach this goal is the design of effective broadcast protocols. In this paper we present an emergency broadcast protocol designed for sensor inter-vehicle communications and based in geographical routing. sensors installed in cars continuously gather important information and in any emergency detection will raise the need for immediate broadcast. The highway is divided in virtual cells, which moves as the vehicles moves. The cell members choose a Cell Reflector that will behave for a certain time interval as a Base Station that will handle the emergency messages coming from members of the same Cell, or close members from Neighbor Cells. Besides that the Cell Reflector serves as an intermediate node in the routing of emergency messages coming from its neighbor Cell Reflectors and does a prioritization of all messages in order to decide which will be the first to be forwarded. After this the message will be forwarded through the other Cell Reflectors. Finally the destination Cell Reflector will send the message to the destination node. Our simulation results show that our proposed protocol is more effective compared to existing inter-vehicles protocols.

关键词： distributed computer systems

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Advance reservation and co-allocation protocol for grid computing

Advance reservation and co-allocation protocol for grid comp...

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1st international conference on e-Science and Grid computing, e-Science 2005

作者： Kuo, Dean Mckeown, Mark School of Computer Science University of Manchester Manchester M13 9PL United Kingdom Manchester Computing University of Manchester Manchester M13 9PL United Kingdom

ISBN: (纸本)0780394631

This paper specifies an advance reservation and co-allocation protocol for grid computing, and a simple framework for supporting well defined charging models. The protocol supports arbitrary level of nesting, that is a reservation may be to a virtual resource (a set of resources). The work is motivated, by the need, for advance reservation in the RealityGrid project. However the protocol is a generic protocol, that can reserve any type of resource (e.g. clusters, network, and storage) and for any grid project where users need to reserve one or more resources in advance. © 2005 ieee.

关键词： distributed computer systems

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The challenge of volunteer computing with lengthy climate model simulations

The challenge of volunteer computing with lengthy climate mo...

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1st international conference on e-Science and Grid computing, e-Science 2005

作者： Christensen, Carl Aina, Tolu Stainforth, David Department of Atmospheric Physics University of Oxford Clarendon Laboratory Oxford OX1 3PU United Kingdom

ISBN: (纸本)0780394631

This paper describes the issues confronted by the *** project in creating a volunteer computing project using a large legacy climate model application. This application typically takes from weeks to months to complete one simulation, and has large memory and disk usage requirements. We describe issues in porting the climate model to a single-processor PC platform, checkpointing, computer resources and workunit size for a simulation, and the volunteer computing infrastructures used (a project-specific system and BOINC). We also describe the methods used to obtain and retain users, and examine the retention/attrition rate of users running the lengthy modelling simulations. © 2005 ieee.

关键词： distributed computer systems

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An on-demand bluetooth scatternet formation and routing protocol for wireless sensor networks

An on-demand bluetooth scatternet formation and routing prot...

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6th international conference on Software Engineering, Artificial Intelligence, Networking and Parallel/distributed computing and 1st ACIS international Workshop on Self-Assembling Wireless Networks, SNPD/SAWN 2005

作者： Zhang, Xin Riley, George F. Department of ECE Georgia Institute of Technology Atlanta GA 30332-0250

ISBN: (纸本)0769522947

Bluetooth is a promising short-range wireless communication technology with the characteristics of interference resilience and power efficiency which are required by wireless sensor networks. As an enhanced sensor node platform, the Intel Mote uses Bluetoth as its radio scheme and MAC protocol. However, most of the existing scatternet formation protocols intend to connect all the nodes within the networks regardless of traffic pattern. For wireless sensor network applications with traffic of low duty cycle, on-demand scatternet formation and routing achieve significant power saving by avoiding to maintain the entire network connectivity. We propose in this paper an on-demand scatternet and route formation protocol for Bluetooth-based wireless sensor networks. It is able to cope with multiple sources initiating traffic simultaneously in densely deployed wireless sensor networks. We also introduce a modified Inquiry scheme using extended ID packet for power efficient propagation of route request messages. Furthermore, we propose a mechanism employing POLL packets in Page processes to transfer scatternet formation and route reply information without extra overhead. Simulation results show that our on-demand scatternet formation and routing protocol can provide multihop channels with reasonable delay for Bluetooth-base wireless sensor networks. © 2005 ieee.

关键词： Wireless telecommunication systems

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Optimal mobile sensor motion planning under nonholomonic constraints for parameter estimation of distributed systems

Optimal mobile sensor motion planning under nonholomonic con...

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作者： Song, Zhen Chen, YangQuan Liang, Jinsong Uciński, Dariusz CSOIS Department of Electrical and Computer Engineering Utah State University Logan UT 84322 United States Institute of Control and Computation Engineering University of Zielona Góra ul. Podgórna 50 65-246 Zielona Góra Poland

ISBN: (纸本)0780389123

This paper presents a numerical solution for a mobile sensor motion trajectory scheduling problem under nonholomonic constraints of a project named MAS-net, which stands for Mobile Actuator- sensor network. The motivation of the MAS-net project, at the first stage, is to estimate diffusion system parameters by networked mobile sensors. Each sensor is mounted on a differential-drive mobile robot to observe the diffusing fog. In other words, this project requires to observe a parabolic distributed parameter systems (DPS) by nonholonomic networked mobile sensors. This paper reformulates this problem in the framework of optimal control and proposes a procedure to obtain a numerical solution by using RIOTS [1] and Matlab PDE Toolbox [2]. The objective function of this method is designed to minimize the effect of the sensing noise. Extensive simulation results are presented for illustration. © 2005 ieee.

关键词： Motion planning

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Energy-efficient data aggregation hierarchy for wireless sensor networks

Energy-efficient data aggregation hierarchy for wireless sen...

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2nd international conference on Quality of Service in Heterogeneous Wired/Wireless Networks, Qshine 2005

作者： Chen, Yuanzhu Peter Liestman, Arthur L. Liu, Jiangchuan School of Computing Science Simon Fraser University 8888 University Drive Burnaby BC Canada

ISBN: (纸本)0769524230

A network of sensors can be used to obtain state-based data from the area in which they are deployed. To reduce costs, the data, sent via intermediate sensors to a sink, is often aggregated (or compressed). This compression is done by a subset of the sensors called aggregators. Since sensors are usually equipped with small and unreplenishable energy reserves, a critical issue is to strategically deploy an appropriate number of aggregators so as to minimize the amount of energy consumed by transporting and aggregating the data. In this paper, we first study single-level aggregation and propose an Energy-Efficient Protocol for Aggregator Selection (EPAS). Then, we generalize it to an aggregation hierarchy and extend EPAS to a Hierarchical Energy-Efficient Protocol for Aggregator Selection (hEPAS). We derive the optimal number of aggregators with generalized compression and power-consumption models, and present fully distributed algorithms for aggregator deployment. Simulation results show that our algorithms significantly reduce the energy consumption for data collection in wireless sensor networks. Moreover, the algorithms do not rely on particular routing protocols, and are thus applicable to a broad spectrum of application environments. © 2005 ieee.

关键词： Wireless telecommunication systems

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