Qualitative simulation models for non-autonomous systems

Qualitative simulation provides a simple and an easy-to-understanding result. Although graph-based modeling method is not expressed simply, the model can be easily developed because it consists of nodes and arcs. However, in traditional definitions, it is not easy to model an autonomous system in which the parameter is indefinite number changing by the environment and time. To solve this problem we provide a new modeling method for the flexible expression. In this paper, first, we define a modeling method on relationship and transmission of effect between nodes. We also give a definition of strength of cause and effect to analyze complex condition and situation. Then, we define a new modeling method to express a complex graph-based qualitative simulation model. This paper includes three following contributions, first, we proposed a flexible modeling method to make a qualitative simulation model, second, More precise simulation graph model can be developed, finally, using our proposed methods, non autonomous systems can be analyzed where the system is changed with time-pass.