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中文摘要：
信任问题是关系C2C社区发展的主要因素之一。通过交易后相互评分，计算C2C社区成员信誉值并为潜在交易提供指导是建立社区信任的一种方法。通过在Sporas模型的基础上增加交易量、交易次数等变量和引入惩罚因子，提出了一种改进的C2C社区成员信誉值计算模型（E—Sporas），并针对信誉诋毁、信誉共谋这2类恶意行为设计仿真实验，检验模型的应用效果，从而为建立在线信誉系统提供一定的借鉴作用。
英文摘要：
Trust is a main factor of the development of C2C communities. Based on scores rated by buyers and sellers after transactions, computing reputation is a way to build trust in C2C community. This paper proposes an improved reputation computing model （E-Sporas）. The results of simulations indicate that E-Sporas has better effects, confronted with fraud behavior, such as reputation slander, reputation collusion. The study gives directions for the development of online reputation system.
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