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

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distributed particle filter with GMM approximation for multiple targets localization and tracking in wireless sensor network

Distributed particle filter with GMM approximation for multi...

引用

4th international Symposium on Information Processing in sensor Networks, IPSN 2005

作者： Sheng, Xiaohong Hu, Yu-Hen Ramanathan, Parameswaran School of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI 53705 United States

ISBN: (纸本)0780392019

Two novel distributed particle filters with Gaussian Mixer approximation are proposed to localize and track multiple moving targets in a wireless sensor network. The distributed particle filters run on a set of uncorrelated sensor cliques that are dynamically organized based on moving target trajectories. These two algorithms differ in how the distributive computing is performed. In the first algorithm, partial results are updated at each sensor clique sequentially based on partial results forwarded from a neighboring clique and local observations. In the second algorithm, all individual cliques compute partial estimates based only on local observations in parallel, and forward their estimates to a fusion center to obtain final output. In order to conserve bandwidth and power, the local sufficient statistics (belief) is approximated by a low dimensional Gaussian mixture model(GMM) before propagating among sensor cliques. We further prove that the posterior distribution estimated by distributed particle filter convergence almost surely to the posterior distribution estimated from a centralized bayesian formula. Moreover, a data-adaptive application layer communication protocol is proposed to facilitate sensor self-organization and collaboration. Simulation results show that the proposed DPF with GMM approximation algorithms provide robust localization and tracking performance at much reduced communication overhead. © 2005 ieee.

关键词： Wireless telecommunication systems

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Building configuration space for multiple UGVs

Building configuration space for multiple UGVs

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ieee international conference on Vehicular Electronics and Safety (ICVES 2005)

作者： Jiao, LN Tang, ZM Nanjing Univ Sci & Technol Dept Comp Sci Nanjing 210094 Peoples R China

ISBN: (纸本)0780394356

Classical Configuration Space (C-space) is often used in such a assumption that obstacles are static and robots have global knowledge of environment. Recently, there has been much more attention in Multi-Robot systems (MRS), unfortunately a MRS which have local sensing cannot meet the assumption. If it can be solved, the motion planning of the MRS will benefit from previous motion planning algorithms in C-space. Toward resolving aforementioned problems, in the first place, we model the environment and robots as some sets of polygons, robots are Unmanned Ground Vehicles (UGVs) with limited sensing range and can communicate with each other. Then a decentralized method is introduced by which two autonomous robots search environment and build C-space obstacles, while exchange and merge partial C-space generated by another robot every certain time interval until the whole C-space obstacles are established, it is similar to Concurrent Mapping and Localization (CML), but we mainly focus on the algorithm of generating and merging C-space. Finally a simulated implementation demonstrates validity of our algorithm.

关键词： Orbital robotics Robot sensing systems Motion planning Robotics and automation Service robots Mobile robots Space technology distributed computing Space exploration Computational efficiency

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Elders know best - Handling churn in less structured P2P systems

Elders know best - Handling churn in less structured P2P sys...

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5th international conference on Peer-to-Peer computing

作者： Qiao, Y Bustamante, FE Northwestern Univ Dept Comp Sci Evanston IL 60201 USA

ISBN: (纸本)0769523765

We address the problem of highly transient populations in unstructured and loosely-structured peer-to-peer systems. We propose a number of illustrative query-related strategies and organizational protocols that, by taking into consideration the expected session times of peers (their lifespans), yield systems with performance characteristics more resilient to the natural instability of their environments. We first demonstrate the benefits of lifespan-based organizational protocols in terms of end-application performance and in the context of dynamic and heterogeneous Internet environments. We do this using a number of currently adopted and proposed query-related strategies, including methods for query distribution, caching and replication. We then show, through trace-driven simulation and wide-area experimentation, the performance advantages of lifespan-based, query-related strategies when layered over currently employed and lifespan-based organizational protocols. While merely illustrative, the evaluated strategies and protocols clearly demonstrate the advantages of considering peers' session time in designing widely-deployed peer-to-peer systems.

关键词： distributed computer systems

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distributed direction-based localization in wireless sensor networks

Distributed direction-based localization in wireless sensor ...

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10th ieee Symposium on Computers and Communications, ISCC 2005

作者： Shih, Kuei-Ping Wang, Sheng-Shih Department of Computer Science and Information Engineering Tamkang University Tamshui 251 Taipei Taiwan

Localization is an important issue in wireless sensor networks (WSNs). Several applications in WSNs can tolerate the diverse levels of accuracy in geographic information such as physical location. Besides, direction information is sufficient for numerous applications in WSNs. Thus, the paper develops a direction-based localization scheme, DLS, in which a node can be aware of its relative direction to a sink rather than its physical absolute location without requiring additional equipments. DLS not only takes the spatial locality property into account, but also exploits the anchor deployment strategy to benefit sensor direction teaming. Additionally, DLS can more precisely position sensors around the boundaries with the aid of the dual-direction coordinate system. Experimental results validate the practicability of DLS and show that DLS is able to achieve well accurate direction estimates. © 2005 ieee.

关键词： distributed computer systems

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Energy-efficient, application-aware medium access for sensor networks

Energy-efficient, application-aware medium access for sensor...

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2nd ieee international conference on Mobile Ad-hoc and sensor systems, MASS 2005

作者： Rajendran, Venkatesh Garcia-Luna-Aceves, J.J. Obraczka, Katia Computer Engineering Department University of California at Santa Cruz Santa Cruz CA 95064 Palo Alto Research Center 3333 Coyote Hill Road Palo Alto CA 94304

ISBN: (纸本)0780394666

We introduce FLAMA (FLow-Aware Medium Access), an energy-efficient medium-access control (MAC) protocol designed for wireless sensor networks. FLAMA achieves energy efficiency by preventing idle listening, data collisions and transmissions to a node that is not ready to receive packets. It adapts medium access schedules to the traffic flows exhibited by the application. FLAMA is simple enough so that it can be run by nodes with limited processing, memory, communication, and power capabilities. We evaluate the performance of FLAMA through simulations and test-bed experimentation. Simulation results indicate that, in terms of reliability, queuing delay and energy savings, FLAMA outperforms TRAMA, the first trafficadaptive, schedule-based MAC proposed for sensor networks, and S-MAC, a contention-based energy-efficient MAC. FLAMA achieves significantly smaller delays (up to 75 times) when compared to TRAMA with significant improvement in energy savings and reliability, demonstrating the importance of applicationawareness in medium access scheduling. Our simulation and test-bed results show that FLAMA achieves better end-to-end reliability with significant energy savings compared to S-MAC. © 2005 ieee.

关键词： Wireless telecommunication systems

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R-Chord: A semantic-Based peer data management model

R-Chord: A semantic-Based peer data management model

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1st international conference on Semantics, Knowledge and Grid, SKG 2005

作者： Liu, Jie Zhuge, Hai Key Lab. of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Graduate School Chinese Academy of Sciences China

ISBN: (纸本)0769525342

The key issue of Peer Data Management systems (PDMSs) is how to efficiently organize and manage distributed resources in P2P networks to accurately route queries from the peer initiating the query to appropriate peers to avoid network flooding. This paper proposes a semantic-based PDMS model, called R-Chord, by deploying the Resource Space Model above the Chord overlay for uniformly, normally and effectively organizing and managing resources distributed in P2P networks. Experiments show that, compared to the Chord model, the R-Chord model is more flexible to support semantic-based queries and can significantly decrease the average visiting number of and visiting times on peers for answering queries. © 2006 ieee.

关键词： distributed database systems

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Self-stabilizing deterministic TDMA for sensor networks

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2nd international conference on distributed computing and Internet Technology, ICDCIT 2005

作者： Arumugam, Mahesh Kulkarni, Sandeep S. Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI 48824

ISBN: (纸本)3540309993

An algorithm for time division multiple access (TDMA) is found to be applicable in converting existing distributed algorithms into a model that is consistent with sensor networks. Such a TDMA service needs to be self-stabilizing so that in the event of corruption of assigned slots and clock drift, it recovers to states from where TDMA slots are consistent. Previous self-stabilizing solutions for TDMA are either randomized or assume that the topology is known upfront and cannot change. Thus, the question of feasibility of self-stabilizing deterministic TDMA algorithm where topology is unknown remains open. In this paper, we present a self-stabilizing, deterministic algorithm for TDMA in networks where a sensor is aware of only its neighbors. This is the first such algorithm that achieves these properties. Moreover, this is the first algorithm that demonstrates the feasibility of stabilization-preserving, deterministic transformation of a shared memory distributed program on an arbitrary topology into a program that is consistent with the sensor network model. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Computer networks

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Modeling and performance analysis of the VEGA grid system

Modeling and performance analysis of the VEGA grid system

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

作者： Haijun, Yang Zhiwei, Xu Yuzhong, Sun Qinghua, Zheng Institute of Computing Technology Chinese Academy of Sciences Beijing 100080

ISBN: (纸本)0780394631

In this paper, we propose four general queueing models based on input and server distributions, to analyze a special Grid system, VEGA grid system version 1.1 (VEGA1.1). The mean queue lengths and mean waiting times of these models are deduced. The two classic applications, the computing-oriented application (Blast computing) and online transaction processing application (air booking service) are employed to analyze and evaluate the grid system and the models. Meanwhile, we validate VEGA 's four prominent characteristics, Versatile Services, Enabling Intelligence, Global Uniformity and Autonomous Control. Finally, we analyze the experiment results, predict the behavior of VEGA1.1 in equilibrium and point out the bottlenecks of the system. © 2005 ieee.

关键词： distributed computer systems

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Bounds on the multi-client incremental computing 05

Bounds on the multi-client incremental computing

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4th Annual ACIS international conference on Computer and Information Science, ICIS 2005

作者： Lin, Cho-Chin Yin, Hao-Yun Department of Electronic Engineering National Ilan University Yuan 260 Taiwan

ISBN: (纸本)0769522963

It has been shown that, in a network computing platform, the arrival order of input data has serious impact on the performance of a computing server. In a multi-client environment, each client competes with the others for the network bandwidth. In this paper, we study the bounds on the time needed to compute the services requested from multiple clients. first, an abstract model of network computing for multiple clients is proposed. Then, based on the model, bounds on the time are developed for a computing server to compute services specified by a class of special sequences. Finally, simulations are conducted to illustrate the effect of message patterns on the performance of a computing server. © 2005 ieee.

关键词： distributed computer systems

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Implementation of parallel plasma Particle-in-Cell codes on SuperSINET based grid

Implementation of parallel plasma Particle-in-Cell codes on ...

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8th international conference on High-Performance computing in Asia-Pacific Region

作者： Tao, Weifeng Cai, Dongsheng Univ Tsukuba Informat Syst & Engn Dept Tsukuba Ibaraki 3050006 Japan

ISBN: (纸本)0769524869

We present our parallel plasma Particle-In-Cell Simulation experiment based on a Computation Grid system on the high performance network SuperSINET This Computation Grid system consists of three supercomputer nodes on SuperSINET configured with the Globus Toolkits and MPICH-G2. In our experiments, we first confirm the scalability of the parallel PIC simulation code on this Computational Grid After we analyze the results and find that the bottleneck point exist on communication across the network, we successfully make use of some useful features of Globus and MPICH-G2 architecture to improve communication efficiency across the network.

关键词： distributed computer systems

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