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The safety and complexity of Railway Interlocking System (RIS) requires the use of advanced methodologies. Formal methods increase quality and provide highest confidence in this area. In this paper, s...afety analysis of moving block RIS is presented. The system is decomposed into four components, i.e., network topology, network state, controls and trains. The formal analysis of the components is presented after further decomposition. Finally, the safety requirements, no collision and no derailing, are defined abstractly and then refined by integrating with the notion of moving block. The railway network is modeled using directed graph. Formal specification is described in VDM-SL.続きを見る
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