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摘要: 针对P2P超节点覆盖网中超节点的选择大都根据节点物理性能而没有考虑搭便车(free-rider)等现象,充分考虑节点间距离、交互情况和查询相似度等提出了一种用户评价机制,根据满意度选择超节点和查询请求的发送对象,不仅可以提高系统效率,同时可以达到减少和消除free-rider节点的目的。实验分析表明,P2P超节点覆盖网用该评价机制提高了文件查询成功率,减少了平均查询跳数,且降低了文件查询延时。