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Published in:
2012 | OriginalPaper | Chapter
Safety Analysis of Computer-Controlled Real-Time Systems with Message Loss Using Communicating DEVS Models
Authors : Hae Sang Song, Tag Gon Kim
Published in: AsiaSim 2012
Publisher: Springer Berlin Heidelberg
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The Communication DEVS formalism is an analysis means for discrete event systems modeled by DEVS formalism which has been widely used as a system theoretical specification. This paper proposes a new method for analyzing safety of real-time discrete event systems using communicating DEVS formalism. It is a part of efforts toward a unified method for modeling, simulation, and logical analysis based on the DEVS formalism and associate theory. For safety analysis of such real-time discrete event systems we first define communicating DEVS and then propose a timed reachability analysis algorithm for the models. The algorithm visits all possible timed states of the model, which is not always possible by using a simulation based state traversal. The proposed method can be well used especially for DEVS-specified systems to check various logical properties such safety, liveness and so on. A case study of a safety analysis for a rail road crossing system illustrates the usefulness of the proposed method.