Definition of Danger Signal in Artificial Immune System with Cloud Method

The definition of danger is one of the most important problems need to be solved in the application of danger theory in artificial immune system. Cloud model is an effective tool in transforming between qualitative concepts and their quantitative expressions. This paper uses the concept of cloud model to abstract the character of parameters of computer system, and consequently present the definition of danger signal. Integrate various danger signals the definition of danger is got. At last, a cooperating stimulate model including both self-nonself recognition method and danger recognition method is presented.