【作者】 章文松；

【导师】 蒋波；

【作者基本信息】 大连海事大学 ， 计算机软件与理论， 2008， 硕士

【摘要】 随着Internet的快速发展,网络所蕴涵的信息量急剧地膨胀。现有基于Client/Server模式的搜索技术,存在着服务器单点失效、信息更新周期长、缺乏语义支持等不足,极大地限制着搜索结果在查准率和查全率两个方面的提高。如何在庞大的互联网上更有效地获得有价值的信息已成为人们日益关注的问题。本文在综合应用P2P技术与语义Web技术的基础上,提出了一种基于语义本体OCSD的P2P网络资源搜索模型。该模型采用了混合式P2P网络结构,对等点根据各自的兴趣组成点组,每个组中选定一个集合点来响应组外查询请求,各个集合点之间互相连接,形成一个覆盖网,充分利用Internet闲散的边缘资源,减轻主干网络和关键点的负荷,有效解决了服务器单点失效、信息更新周期长等问题;依据ACM分类标准,利用protege工具构建了以计算机科学文献为主题的语义本体OCSD,达成P2P网络各对等点资源的统一描述和共享,保证了机器对资源的可理解性,提供了语义支持。针对当前各个P2P系统间不能相互兼容的问题,本文采用了Sun公司的新一代通用P2P开发平台JXTA,设计并部分实现了基于语义的P2P资源共享系统ORSS。本文提出了的基于JXTA的P2P分布式搜索模型,借助Ontology的语义表达优势构建资源共享系统的方法,与现有的基于关键字搜索、目录式搜索、元搜索等搜索技术形成互补,达到了预期设计的目的。更多还原

【Abstract】 The Internet’s phenomenal impact and subsequent growth stemmed primarily from the open, public, worldwide networking it offers. Most current applications, however, use client-server technologies that incorporate networking as an ancillary, Single point of failure and value-added feature, and limit resources sharing to some extent. It has been a hot issue about how to get useful and valuable information in the tremendous Internet.Nowadays a new integration concept based on the notion of Semantic Web is being developed. The concept assumes semantic annotation of Web resources and services to make them "understandable" by computers. On the other hand, emerging Peer-to-Peer technology and appropriate networks suite well to the increasingly decentralized nature of modern companies and their industrial and business processes. Some of the benefits of a P2P approach include: improving scalability by avoiding dependency on centralized points; eliminating the need for costly infrastructure by enabling direct communication among clients; and enabling resource aggregation.On the basis of P2P technology and Semantic Web relevant technologies, This paper proposes a kind of web resources search module based on the Ontology OCSD. To resolve the compatibility problem existing in the P2P systems, JXTA is adopted as a general P2P development platform. Based on the study on JXTA, this thesis chooses the Hybrid P2P network model. Peers organize themselves into peer groups in accordance with their common interests. Each group selects a rendezvous peer to respond to the outside request. All rendezvous peers interconnect, forming a overlay network. According to ACM classification standards, we build the peer knowledge ontology OCSD with the protege tool, which described by the W3C standards OWL ontology language, and select computer scientific document as its subject, reaching on the unified description and sharing of the P2P network resources; choose the RDF/RDFS markup language to achieve the semantic tagging of the shared resources, achieve Ontology reasoning and data query with the Jena tool in the specific field to ensure that the resources is understandable for the machine; design and preliminary imply the P2P resource sharing system ORSS based on semantic. There is a real sense of exploration to further develop and improve the resources searching and sharing technology.更多还原