Journal of KIISE:Software and Applications (한국정보과학회논문지:소프트웨어및응용)

Korean Institute of Information Scientists and Engineers (한국정보과학회)
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Extending Model Checker for Real-time Verification of Statecharts

스테이트차트의 실시간 검증을 위한 모델체커의 확장

  • Published : 2004.06.01
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Abstract

This paper presents a method for real-time verification of Statecharts. Statecharts has been widely used for real-time reactive systems, and supports two time models: synchronous and asynchronous. However, existing real-time verification methods for them are incompatible with the asynchronous time model or increase state space by introducing new variables to the target models. We solved these problems by extending existing model checking algorithms. The extended algorithms can be used with both time models of Statecharts because they consider time increasing transitions only. In addition, they do not increase target state space since they count those transitions internally without additional variables. We extended an existing model checker, NuSMV, based on the proposed algorithms and conducted some experiments to show their advantage.

본 연구는 스테이트차트의 실시간 검증을 위한 알고리즘을 제안한다. 스테이트차트는 실시간 반응형 시스템의 명세에 많이 사용되고 있으며 동기적과 비동기적인 두개의 시간모델을 지원한다. 그러나 기존의 스테이트차트에 대한 실시간 검증 방법은 비동기적 시간 모델과 호환되지 않거나, 변수를 모델에 추가함으로써 모텔의 상태 공간을 증가시키는 단점이 있었다. 우리는 기존의 모델 체킹 알고리즘을 확장하여 이러한 문제점을 해결하였다. 확장된 알고리즘은 시간을 증가시키는 전이만을 고려하기 때문에 스테이트차트의 두 가지 시간 모델에 모두 사용할 수 있으며, 시간의 계산이 알고리즘 내부적으로 이루어지기 때문에 모델에 변수를 추가할 필요가 없어 상태공간을 증가시키지 않는다. 본 연구는 이러한 알고리즘을 토대로 기존의 모델 체커인 NuSMV를 확장하였으며, 사례 연구를 통하여 그 유용성을 확인하였다.

Keywords

References

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