扩展主观逻辑的粗化与细化

Coarsening and Refining of Extended Subjective Logic

为了提高主观逻辑的扩展性和灵活性,文中结合证据理论及信任结构,提出了基于三项事件的扩展主观逻辑.通过重新定义观念空间与事实空间之间的映射关系,给出扩展主观逻辑的粗化和细化映射及相应的计算规则,扩展主观逻辑能够根据实际环境的需要提供不同详细程度的识别框架,并利用粗化和细化映射在扩展主观逻辑上统一对信任函数进行结合,而结果可重新映射回原识别框架.实例及分析表明,利用扩展主观逻辑可以解决不同识别框架之间信任信息的融合问题.

In order to improve the extensibility and flexibility of the subjective logic,an extended subjective logic is proposed based on the ternary events incorporating the evidence theory and the belief structure.By redefining the mapping relationship between the opinion space and the evidence space and by presenting the coarsening and refining mappings as well as the computation rules,the extended subjective logic can offer discernment frames with different details according to the practical requirements of the environment,and can combine the belief functions via the coarsening and refining mappings.The results of combination can also map back to the original discernment frame.Experimental and analytical results show that the proposed extended subjective logic can solve the problem of trust information fusion between different discernment frames.