基于不同置信度的证据组合规则及应用

Combination Rules of Various Credibility Evidences and Application

使用一种组合来自不同置信度证据源证据的组合方法 ,对于该类问题 ,使用传统Dempster Shafer理论往往得到与直觉相悖的结果·使用有效因子λ衡量证据源的可靠性 ,并将其起引进信任函数 ,所有的证据经过有效性评估后再进行组合 ,并将该方法用于专家系统 ,实验证明 ,即使是同一个专家 ,由于其擅长不同 ,对于不同问题给出结论的可靠性不同 ,给定方法与传统D S理论相比 ,提高了决策的准确性·

Combination rules which fusing multi evidence with various credibility were given. The traditional Dempster Shafer rules often result in wrong conclusion due to the difference of credibility from multi evidence. A new belief function was derived with λ joining in. λ is a parameter of expected credibility change in evidence authority. Evidences are first transferred according to their λ and then are combined. The method was applied to the power network expert. Compared with the traditional D S theory this method improves the decision making accuracy.