基于时效量化的Web服务评价模型

现有的服务评价方法缺乏时效性,而应用于其他系统的时效量化方法难以体现服务评价时效在衰退上的差异特征。由此,建立了基于时效量化的Web服务评价模型。模型以评价时效的遗忘特征为切入点,分析评价时效与人类记忆的关系,揭示评价时效遗忘速率的更新规律,构建符合时效衰退差异的时效量化方法。同时,根据量化结果,优化评价窗口长度,从而解决人工设定窗口长度的不合理性。实验表明,模型在满足时效衰退差异性的基础上,确保了较低的评价误差和计算代价,并合理拟合用户评价,具有一定理论研究和实际应用价值。

Web Services Evaluation Model Based on Qualification of Time Utility

Current evaluation methods of Web services do not consider the timcutility, while qualification of timcutility in other systems are hard to satisfy the requirements of distinction of decay of time utility. As a result, Web service evaluation model based on qualification of time utility was proposed. Based on forgetting phenomenon of time utility, the model analyzes the relationship between timcutility and memory, unfolds regular of update of forgetting-ratio to time utility, and designs method to qualify time utility concerned with the distinction of decay of time utility. Meanwhile, result of time utility is used to optimize calculation of length of evaluation widows, as to improve KNN in artificial setting of evaluation windows. Experiments shows that model meets the requirements of distinction of decay of time utility, achieves low evaluation error, reduces computational cost and fits users' evaluation, which is meaningful to theoretical research and practical use.