关键词: 扩展ECA法, 相似实例, 相似度, 共轭相似度, 相似度阈值

Abstract: Through concept of similarity between two instances and Nearest Neighbor (NN) algorithm, unexpected process exception could be handled referring to valuable means from its similar instance searched by extended EventConditionAction (ECA) rule method. However, it was hard to determine weighted factors of instance attributes which led to difficulty in implementation. Thus, concept of conjugated similarity degree and its calculating formula were defined. Recurring to threshold of conjugated similarity degree and priority of instance properties, the most similar instance in ECA rules base could be achieved after two times searching without any trouble in coefficients. This algorithm simplified similarity computation, case search and judgment process, and improved the system's ability to handle unexpected exception and the validity of extended ECA method was increased.

Key words: extended event-condition-action method, similar instance, similarity, conjugated similarity, threshold of similarity