摘要
针对开放环境中web服务的动态性和随机性问题,提出支持区间型服务质量(QoS)的web服务选择算法.算法中QoS的不确定性用带概率分布的区间数来描述,通过QoS的抽样数据,可计算出区间上的概率密度.比较各web服务在QoS置信区间上的概率密度,有助于准确描述QoS受环境影响的程度.结合这种比较方式以及组合服务的区间型QoS模型,设计出一种有区间型QoS保障的组合服务算法.仿真实验表明,区间型QoS服务选择有利于减少动态环境对选择排序的影响,提高服务选择的准确性.
In order to tackle the problem appeared in dynamic and stochastic nature of web service, a new web service selection algorithm based on interval quality of service （QoS） is proposed. The uncertainty is described by interval QoS with probability distribution. The probability distribution can be computed in terms of the sample data. By comparing the probability density in the confidence interval of QoS, it can more accurately describe the degree with which the QoS is affected by the open environment. Integrating this comparison method with interval QoS model of composite web service, a web service composition algorithm with the interval QoS guaranteed is designed. Experiment shows the interval numbers contribute to reduce the effect imposed by the dynamic environment and enhance the correctness of service selection.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2011年第4期80-84,共5页
Journal of Beijing University of Posts and Telecommunications
基金
"十一五"国家科技支撑计划项目(2006BAJ16B04-02)
关键词
WEB服务选择
不确定性
服务质量
区间数
web service selection
uncertainty
quality of service
interval number
