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服务通告和发现在MANET(Mobile Ad hoc Networks)网络中,是一个十分重要的组成部分.现有的服务通告和发现协议不是为MANET网络设计的.文章提出了一个适合MANET、基于ZRP(Zone Routing Protocol)的服务通告及发现协议.服务的通告与发现存在于ZRP路由控制分组中,避免了周期性的通告给MANET网络带来的负载,节约了有限的带宽和设备的能耗. 相似文献
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网格资源的组织与发现是网格计算的关键问题。为了有效地组织和发现资源,在LDAP目录服务的基础上,利用移动Agent技术和分块索引技术,提出一种改进的基于移动Agent的网格资源组织与发现方法,较好地解决了资源的组织与快速发现问题。 相似文献
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Abhishek Patil Yunhao Liu Li Xiao A.-H. Esfahanian Lionel M. Ni 《Wireless Networks》2008,14(4):415-433
Overlay networks have made it easy to implement multicast functionality in MANETs. Their flexibility to adapt to different
environments has helped in their steady growth. Overlay multicast trees that are built using location information account
for node mobility and have a low latency. However, the performance gains of such trees are offset by the overhead involved
in distributing and maintaining precise location information. As the degree of (location) accuracy increases, the performance
improves but the overhead required to store and broadcast this information also increases. In this paper, we present SOLONet,
a design to build a sub-optimal location aided overlay multicast tree, where location updates of each member node are event
based. Unlike several other approaches, SOLONet doesn’t require every packet to carry location information or each node maintain
location information of every other node or carrying out expensive location broadcast for each node. Our simulation results
indicate that SOLONet is scalable and its sub-optimal tree performs very similar to an overlay tree built by using precise
location information. SOLONet strikes a good balance between the advantages of using location information (for building efficient
overlay multicast trees) versus the cost of maintaining and distributing location information of every member nodes.
Abhishek Patil received his BE degree in Electronics and Telecommunications Engineering from University of Mumbai (India) in 1999 and an
MS in Electrical and Computer Engineering from Michigan State University in 2002. He finished his PhD in 2005 from the Department
of Computer Science and Engineering at Michigan State University. He is a research engineer at Kiyon, Inc. located in San
Diego, California. His research interests include wireless mesh networks, UWB, mobile ad hoc networks, application layer multicast,
location-aware computing, RFIDs, and pervasive computing.
Yunhao Liu received his BS degree in Automation Department from Tsinghua University, China, in 1995, and an MA degree in Beijing Foreign
Studies University, China, in 1997, and an MS and a Ph.D. degree in Computer Science and Engineering at Michigan State University
in 2003 and 2004, respectively. He is now an assistant professor in the Department of Computer Science at Hong Kong University
of Science and Technology. His research interests include wireless sensor networks, peer-to-peer and grid computing, pervasive
computing, and network security. He is a senior member of the IEEE Computer Society.
Li Xiao received the BS and MS degrees in computer science from Northwestern Polytechnic University, China, and the PhD degree in
computer science from the College of William and Mary in 2002. She is an assistant professor of computer science and engineering
at Michigan State University. Her research interests are in the areas of distributed and Internet systems, overlay systems
and applications, and sensor networks. She is a member of the ACM, the IEEE, the IEEE Computer Society, and IEEE Women in
Engineering.
Abdol-Hossein Esfahanian received his B.S. degree in Electrical Engineering and the M.S. degree in Computer, Information, and Control Engineering
from the University of Michigan in 1975 and 1977 respectively, and the Ph.D. degree in Computer Science from Northwestern
University in 1983. He was an Assistant Professor of Computer Science at Michigan State University from September 1983 to
May 1990. Since June 1990, he has been an Associate Professor with the same department, and from August 1994 to May 2004,
he was the Graduate Program Director. He was awarded ‘The 1998 Withrow Exceptional Service Award’, and ‘The 2005 Withrow Teaching
Excellence Award’. Dr. Esfahanian has published articles in journals such as IEEE Transactions, NETWORKS, Discrete Applied
Mathematic, Graph Theory, and Parallel and Distributed Computing. He was an Associate Editor of NETWORKS, from 1996 to 1999.
He has been conducting research in applied graph theory, computer communications, and fault-tolerant computing.
Lionel M. Ni earned his Ph.D. degree in electrical and computer engineering from Purdue University in 1980. He is Chair Professor and
Head of Computer Science and Engineering Department of the Hong Kong University of Science and Technology. His research interests
include wireless sensor networks, parallel architectures, distributed systems, high-speed networks, and pervasive computing.
A fellow of IEEE, Dr. Ni has chaired many professional conferences and has received a number of awards for authoring outstanding
papers. 相似文献
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The emergence of personal portable devices, such as PDA's and Mobile phones, with considerable processing and communication capabilities, has led to a desire to use various combinations of these devices together to achieve new and as yet unrealised operations. Not only are mobile devices expected to offer conventional facilities like email and web browsing but also more demanding multimedia applications. Attaining these operations within a fixed network environment with high-power workstations is non-trivial; however, highly dynamic ad hoc environments further complicate this scenario. In particular, a means of discovering available devices and enabling manipulation of them within a highly active environment is required. In this paper we present a novel architecture called MARE that facilitates the detection and manipulation of resources in ad hoc environments. 相似文献
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《电子学报:英文版》2016,(5):841-847
This paper introduces a concept of User latent intentions (ULI) consisting of user preference intentions and user herd intentions for the expression of a user's personalized requirements of services.Theory of TCP-net and herd psychology is employed for the establishment of user preference decision model and user herd decision model,followed with a user-centric service discovery algorithm based on ULI.Simulation and experimental results demonstrate that the proposed ULI-based service discovery approach can increase the effectiveness of service discovery. 相似文献
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MDFNSSDP:基于最小转发节点覆盖集合的无线自组网服务发现协议 总被引:2,自引:0,他引:2
服务发现是在网络中寻找所需服务的技术,它是无线自组网的一项基本技术.本文提出了一个高效的无线自组网服务发现协议:MDFNSSDP.MDFNSSDP在转发服务需求包时能充分利用各项信息最大限度减少需要覆盖的2跳邻居节点数量,并选用最少的转发节点来覆盖这些2跳邻居,从而大大节约了信息包开销,提高了协议效率.MDFNSSDP能在一次服务发现会话中完成多个服务发现任务,并能保证服务发现会话的覆盖范围,这一点已经通过理论分析得到了证明.计算机仿真结果表明了MDFNSSDP的显著优越性. 相似文献
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基于泛在网络的资源发现与监控模型的研究 总被引:2,自引:1,他引:1
泛在网络是一个开放的巨复杂系统,泛在网络环境中的资源具有广域分布、自治、异构、动态等特性,如何对泛在网络资源进行有效的管理以满足用户的需求是一个极具挑战性的问题.文中结合移动Agent技术提出了一种新的泛在网络资源发现与监控模型.详细介绍了它的总体框架.工作机制,并给出了性能评价. 相似文献
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移动ad hoc网络中要求各节点问在缺乏预备知识的情况下进行相互通讯和协作,因此,对网络中各种服务的自动发现成为了其中的一个关键问题。将各节点的位置信息和DHT技术结合起来.提出了一种高效的面向移动ad hoc网络的服务发现方案。首先直接基于网络的物理拓扑结构来构建一种分布式哈希表.从而有效地消除了现有DHT方案的拓扑结构不匹配问题。然后提出了一种维度映射的方案.以将多维的服务描述信息映射到二维的哈希键值空间上。最后提出一种区域搜索算法,以高效地支持对服务的条件查询。 相似文献
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结构化P2P网络下的多属性资源发现一直是一个公开问题.本文针对当前一种新颖的、优于传统方法的多属性资源发现方法-PIRD,深入分析了其在网络动态变化时可能出现的低查询效率问题,并提出一种解决方法:基于闲谈的PIRD(Gossip-based PIRD,G-PIRD).G-PIRD通过闲谈算法估计网络规模,动态调整资源索引的发布以保证高的查询效率.同时针对G-PIRD可能导致的负载不均衡问题,提出一种基于有界LSH(Bounded LSH,B-LSH )的负载均衡策略.试验证明:G-PIRD能动态适应网络变化,保证高效率的多属性资源发现;以及G-PIRD的负载均衡策略在保证高查询效率的同时,大大地降低了节点的索引负载. 相似文献
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针对网格集中式的资源发现方法存在单点失效、负载均衡差等问题,提出利用P2P技术进行网格资源发现方法.该方法通过改进Chord协议的后继节点函数和finger表,提出Echord(Enhanced Chord)协议,结合Echord协议特点,将网格中的虚拟组织构建成环状拓扑结构.网格资源被描述成基于XML的RDF形式,并按照一定的资源部署算法被均衡地发布在网格节点上.给出了如何应用Echord协议进行网格资源发现的算法.理论分析和仿真实验结果表明,相比于基于Chord的网格资源发现方法,该方法能改善系统的平均查找长度、消息传播性能、资源随机查找成功率. 相似文献
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一种基于本体语义的网格服务发现模型 总被引:1,自引:1,他引:0
龚松杰 《微电子学与计算机》2008,25(1):97-99
在网格环境中,网格服务的发现机制对于系统的性能和效率有着重要的意义和作用。目前网格服务发现模型多数是集中式的、基于关键字的服务匹配模型,缺乏灵活性和推理能力,发现结果难以令人满意。提出了一种基于本体论语义和Agent代理的网格服务发现模型。采用Agent代理技术进行服务搜索,不同的代理能够提供不同领域的本体知识库,从而达到多领域的服务发现;利用本体论语义进行服务的匹配,从而达到智能化的服务发现。该模型提高了服务发现的准确率,同时也增强了系统的可维护性、灵活性和扩展性以及服务管理的自治性和容错性。 相似文献
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分析了传统服务发现机制存在的问题,针对移动嵌入式环境,提出了基于P2P之上移动agent的Web服务发现机制,讨论了其体系结构和工作模型设计的关键技术。 相似文献
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传统的网格资源发现方法没有考虑节点和资源本身性能的优劣性。针对这一问题,提出了基于马尔可夫决策过程(MDP)的网格资源发现方法,利用其对固定目标的最优搜索理论建立MDP模型实现报酬最优的资源发现,并对该模型仿真分析,验证其性能。 相似文献
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能量消耗是移动自组网(MANET)路由协议研究中的一介热点所在。区域路由协议作为混合式寻路机制,为移动自组网提供了一种灵活的路由选择方式。在其路由发现的过程中,存在着多径问题,合理地利用这些路径进行路由转发,可以降低节点间功耗的偏差,使得整介网络能量消耗比较均匀。仿真表明,区域内路由部分中,该算法可较大地延长网络生存周期,而区域间路由部分所受影响则较小。 相似文献
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(西北工业大学计算机学院,陕西西安,710072)【摘要】CARD架构适用于大规模、高查询率、每次查询的数据传输量较小的Ad-hoc网络,它的核心目标是降低网络资源发现能耗,延长网络生命周期。文章首先介绍了CARD架构的结构;然后,建立了该架构的数学模型,该模型以无线传感器网络为目标场景,并推导出CARD架构的能耗和查询成功率与各个参数之间的函数关系;最后,根据该模型对CARD架构的能耗和查询成功率进行了理论分析,为CARD架构的参数选择提供了可靠的依据,并为对架构的进一步优化打下了坚实基础。 相似文献
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Olga Ratsimor Dipanjan Chakraborty Anupam Joshi Timothy Finin Yelena Yesha 《Mobile Networks and Applications》2004,9(6):679-692
Directory based service discovery mechanisms are unsuitable for ad-hoc m-commerce environments. Working towards finding an alternate mechanism, we developed Allia: a peer-to-peer caching based and policy-driven agent-service discovery framework that facilitates cross-platform service discovery in ad-hoc environments. Our approach achieves a high degree of flexibility in adapting itself to changes in ad-hoc environments and is devoid of common problems associated with structured compound formation in mobile commerce environments. Device capabilities and limitations, user preferences regarding device usage, application specifics with respect to mobile commerce are factors that our framework adapts to. We have described our initial implementation of Allia over ThinkPads and iPAQs by extending the LEAP Agent Platform and using Bluetooth as the underlying network protocol. In addition, we evaluated Allia's performance by running simulations of our protocol in Glomosim simulator. We also compared our framework against a structured compound-based architecture. 相似文献