| With the rapid development of C2C e-commerce, credit crisis caused by the credit speculation and internet fraud becomes increasingly serious. And it has hindered the development of online trading. So it is important for us to establish a reliable credit assessment mechanisms to help traders assess the credibility of each other.The current e-commerce credit assessment mechanisms have many problems,such as without considering the impact of the actual amount and transaction time when calculates the credibility; virtual goods and physical goods can not separate score and so on. In order to solve these problems, this paper presents a new credit assessment model-dynamic credit evaluation model of C2C based on fuzzy theory and time-frame. The model uses fuzzy comprehensive evaluation to calculate the credit value. In the process of calculation the model fully considers the affect of the evaluators'credibility, that is, for different evaluators the weights are also different. The model meets the ask of complex network environment and increases the reliability and authenticity of credit.The application of fuzzy comprehensive evaluation eliminates the adverse impact to the final value of the credit, which is caused by the ambiguity of evaluator credibility and transaction amount. At the same time, the model divided the seller's transaction history into a number of time frames, and defines 4 parameters:short-time-credit, long-time-credit, cumulative-negative-credit and evaluator credibility. And the short-time-credit reflects the seller's credit situation in the recent time frame, so it has a higher reference value. The final evaluation results of sellers is the minimum between the short-time-credit and long-time-credit. By combining the cumulative-negative-credit and credit increase factors can punish the dishonest sellers. In short, compared with the traditional credit models, the new one presented in this article has higher accuracy and greater adaptability.Finally, the concrete realization of the credit evaluation model is given. |
