摘要： 针对现有P2P分组搜索机制存在的不足，提出一种改进的搜索机制，以节点间标引词权重向量的余弦相似度为基础，综合考虑节点间距离因素来建立合理的逻辑分组，采用一种任务分担策略，由不同组员充当外联节点实现组间搜索。实验结果表明，该机制网络扩展性强，具有较高的搜索效率和查全率。

关键词: P2P搜索机制, 相似度, 组内搜索, 组间搜索

Abstract: Aiming at the deficit of the existing grouping search mechanism, an improved search mechanism is proposed, which establishes a logical group reasonably based on the cosine similarity of term weight vector, integrating with considering the distance between the nodes. A task-sharing strategy is presented in the inter-group search, letting different members act as the managers of the links. Experimental result shows that the mechanism has strong expansibility, efficient search capability and higher recall rate.

Key words: P2P search mechanism, similarity, intra-group search, inter-group search

中图分类号: 

• TP393