Existing P2P information sharing systems can only support semantics-free sharing of large granularity and inefficiently utilize their own resources, limiting their large-scale, higher-level applications. To address these challenges, the resources were clustered to form topics and the peers which include relevant topics were linked to form semantic overlay network. According to the principle, a four-layer based architecture was proposed, which is made up of resource layer, information service center layer, semantic overlay network layer and application-layer. The corresponding analysis shows that the P2P information sharing system based on semantic overlay network effectively optimizes network performance and is scalable.%现有P2P信息共享系统存在仅支持粗粒度、弱语义共享以及系统效率低等局限性,限制了其更大规模、更高层次的应用.基于资源相似节点通过信息聚类聚集在同一主题域,实现节点资源有序组织的思想,提出了一种基于语义覆盖网的P2P信息共享系统,建立由资源层、信息服务中心层、语义覆盖网络层和应用层四个层次组成的系统框架结构,并阐述了系统流程.分析表明,该系统有效优化了网络性能,可扩展性好,可以胜任不同的网络规模.
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