Abstract:

In order to improve the extensibility and flexibility of the subjective logic , an extended subjective logic is proposed based on the temary 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 discemment 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 discemment frame. Experimental and analytical results show that the proposed extended subjective logic can solve the problem of trust information fusion between different discemment frames.

Key words: subjective logic, belief structure, evidence theory coarsening, refinement