基于主题和物理位置相近原则的层次化对等语义覆盖网络结构  

A Hierarchical P2P Semantic Overlay Network Architecture Based on Topic and Physical Proximity

作　　者：于婧[1] 张建辉[1] 顾小卓[1] 汪斌强[1] 

机构地区：[1]国家数字交换系统工程技术研究中心,郑州450002

出　　处：《电子与信息学报》2008年第8期1999-2003,共5页Journal of Electronics & Information Technology

基　　金：国家973计划(2007CB307102)资助课题

摘　　要：对等语义覆盖网络构建主要采用索引和超级节点的方法,不可避免地存在瓶颈问题,同时忽略了覆盖网络与实际网络拓扑一致性问题对语义覆盖网络性能的重要影响。该文提出的对等语义覆盖网络结构TPPH充分结合了结构化P2P网络高效的定位和非结构化P2P网络的复杂检索功能,采用分布式哈希表机制将相同主题节点组织成主题区域,在同一主题区域内通过物理位置相近原则进行群的划分,从而在物理网络拓扑基础上建立语义P2P覆盖网络结构。性能分析和仿真实验表明,该结构显著提高了查全率并缩短了平均查询时延,是一种支持复杂查询、高性能的语义覆盖网络结构。The main methods to construct P2P overlay network are index and super-node, which introduce bottleneck problem and ignore the significant influence of topology aware problem. A new P2P overlay network TPPH is established. It combines the virtue of efficient locating performance of structured P2P network and complex searching function of unstructured P2P network. Based on physical network topology, it partitioned nodes into topic domain by utilizing distributed hash table mechanism, and according to physical-proximity principle it clustered nodes within a domain. Analysis and simulation results indicate that TPPH can dramatically increase the recall and decrease the searching latency simultaneously, thus it is complex searching available and a high performance semantic overlay network architecture.

关 键 词：对等网络 语义覆盖网络 拓扑一致性 物理位置相近 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]