随着越来越多的用户和服务参与到服务计算中，服务选择变得更重要，而基于可信QoS完成服务选择已成为一个日趋重要的研究课题。脱离目标用户偏好的可信QoS求取往往难以为该用户提供符合真实感观的选择依据。文中主要基于目标用户偏好进行可信QoS服务选择方法的研究。首先引入服务多属性评分和目标用户偏好，根据历史用户评分的偏离度来衡量历史用户同目标用户之间的信任度(参考度)，将历史用户中评分可信度较低的用户筛选出去，剩余用户即是可信用户。然后基于服务的基准评价向量和可信用户评价向量进行相似度计算以决定各可信用户的参考权重，再结合参考权重求出各候选服务的最终QoS评分值以供目标用户选择。最后给出一个具体实例以说明该方法的有效性和可行性。%It is more important to perform service selection as increasingly more users and services are involved in service computing. Service selection based on trusted QoS has become an increasingly important research topic. Trusted QoS evaluation without considera-tions on preference of target user is often difficult to provide the real and reliable selection support satisfying the user’ s requirement. It ex-plores the study on trusted QoS service selection based on the target user’ s preference in this paper. The service multi-attribute rating and the preference of the target user is introduced firstly,use of the deviation of user ratings to measure trust between history users and target users. Filtering out the lower trust history user from history users,the remaning are trusted ones. The similarity between existed trusted us-er evaluation and the benchmark of a candidate service is computed to determine the reference weight. The final QoS score of each candi-date service is obtained for target user to select based on the preference of target user and trusted QoS evaluation with reference weights. Finally,a case study is given to illustrate the effectiveness and feasibility of this method.
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