Research on uncertain weight of web service QoS criterions

There are three types of web service QoS criterion weight: subjective weight decided by user´s preference of QoS criterion, objective weight affected by QoS criterion value and synthetic weight synthesized with the two. Considering the uncertainty of conversion from qualitative value, which is used to describe user´s preference, to quantitative value, the uncertainty of subjective weight is described by cloud model and the weight is calculated using normalization method and least square method. Objective weight is obtained using entropy method. For synthetic weight, Cobb-Douglas method is used to synthesize subjective and objective weight. Lastly, a case is studied and sensibility analysis of weight based on uncertain weight is discussed.