| 摘 要: 功能相同或类似的Web服务选择时需考虑服务的QoS属性及权重，由于用户对QoS属性的偏好具有主观认 知的不确定性，并且某些QoS属性值也通常不是确定的。因此，Qos属性的权重具有不确定性。针对QoS属性的不确定 权重求解问题，使用云模型表示主观认知的不确定性，基于用户偏好信息，利用归一化和最小二乘法求解主观权重， 基于Qos属性值利用熵方法求解客观权重，并使用科布—道格拉斯方法合成主、客观权重，能够有效表达由主观认知和 QoS属性值造成的权重不确定性。 |
| 关键词: QoS属性；不确定权重；云模型；熵方法 |
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中图分类号: TP311
文献标识码: A
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| A Method for Calculating Uncertain Weight of Web Service QoS Criterions |
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FAN Zhiqiang，LI Ning，HAO Bo
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( North China Institute of Computing Technology, Beijing 100083, China)
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| Abstract: The weight of web service QoS criteria is crucial when selecting web service with same or similar functions. Since the subjective cognition uncertainty of user's preference on QoS criterions and the uncertainty of some QoS criterion values,the weight of QoS criterion is uncertain as well.The paper proposes to use uncertain weight to present the weight of QoS criterions.For subjective weight,it is solved using normalization method or least square method based on user's preference,and the uncertainty is described by cloud model.For objective weight,the certain weight is obtained using entropy method with supplements based on the values of criterions.For synthetic weight,Cobb-Douglas method is used to synthesize subjective and objective weight.Our proposed method can effectively describe the uncertainty of weight caused by subjective cognition and QoS criterion values. |
| Keywords: QoS criterion;uncertain weight;cloud model;entropy method |
