【摘要】 为了有效抑制P2P网络中节点的搭便车行为,本文在校园网中开展研究,深入研究了搭便车用户的行为特征,并分析其根本原因,将用户行为引入激励机制,提出一种基于用户行为的激励机制User Behavior based Incentive Mechanism(UBIM)并设计了其效用函数,在效用函数复杂度和效率之间找到了良好的折中。在此基础上,设计并实现了UBIM的原型系统BITShare,经过长期的运行表明,UBIM在有效抑制搭便车行为的同时,能显著提高系统的查询命中率、热门资源分享率以及节点平均在线时长。更多还原

【Abstract】 In order to effectively inhibit the free-rider behavior of nodes in P2P network,the behavioral characteristics of free-riding users were studied and the reason of free-rider was analyzed in campus network.By combining user behavior with incentive mechanism,User Behavior Based Incentive Mechanism(UBIM) was proposed and its utility function was designed.A good compromise between complexity and efficiency of the utility function were founded.On this basis,BITShare is designed to verify UBIM’s effect.A long-term test shows that UBIM can effectively inhibit the free-rider behavior and at the same time can greatly improve queries hit ratio,popular resources sharing ratio and nodes’ average online time.更多还原