语言辞MYCIN可信度模型及其二阶模型

THE LINGUISTIC MYCIN CERTAINTY FACTOR MODEL AND ITS SECOND-ORDER MODEL

根据Ｆｕｚｚｙ数学的可能性理论，本文扩展了ＭＹＣＩＮ可信度模型，使可信度能够取语言值；然后讨论了其二阶不确定性的问题，为其建立了基于语言概率辞的二阶模型；最后还讨论了组成证据和规则前提、结论的命题是Ｆｕｚｚｙ的情况，给出了相应的处理办法。

This paper is based upon the possibility theory. Firet. we extend the MYCIN Certainty Factor model such that the Certainty Factoro can be estimated in terms of linguistic terms in accordance with our intuitions. Second, we discuss the issue about its second-order uncertainty and build the corresponding second-order model based on linguistic probability terms. Finally, it is involved that propositions composing evidence and rules are fuzzy and the corresponding solution is given.