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Operational and algebraic semantics of concurrent processes
Handbook of theoretical computer science (vol. B)
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ACM Transactions on Programming Languages and Systems (TOPLAS)
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Monitoring and debugging of distributed real-time systems
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Information Processing Letters
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IEEE Transactions on Software Engineering
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IEEE Transactions on Software Engineering
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CONCUR '91 Proceedings of the 2nd International Conference on Concurrency Theory
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CONCUR '96 Proceedings of the 7th International Conference on Concurrency Theory
An Algebraic Semantics for Hierarchical P/T Nets
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CAV '90 Proceedings of the 2nd International Workshop on Computer Aided Verification
Checking properties of nets using transformation
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CAV '94 Proceedings of the 6th International Conference on Computer Aided Verification
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CAV '97 Proceedings of the 9th International Conference on Computer Aided Verification
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CAV '97 Proceedings of the 9th International Conference on Computer Aided Verification
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IWSSD '93 Proceedings of the 7th international workshop on Software specification and design
Journal of Systems and Software
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In this paper, we present a new compositional verification methodology for efficiently verifying high-assurance properties such as reachability and deadlock freedom of real-time systems. In this methodology, each component of real-time systems is initially specified as a timed automaton and it communicates with other components via synchronous and/or asynchronous communication channels. Then, each component is analyzed by a generation of its state-space graph which is formalized as a new state-space representation model called Multiset Labeled Transition Systems (MLTSs). Afterward, the state spaces of the components are hierarchically composed and simplified through a composition algorithm and a set of condensation rules, respectively, to get a condensed state space of the system. The simplified state spaces preserve equivalence with respect to deadlock and reachable states. Such equivalence is assured by our reduction theories called IOT-failure equivalence and IOT-state equivalence. To show the performance of our methodology, we developed a verification tool RT-IOTA and carried out experiments on some benchmarks such as CSMA/CD protocol, a rail-road crossing, an alternating bit-protocol, etc. Specifically, we look at the time taken to generate the state-space, the size of the state space, and the amount of reduction achieved by our condensation rules. The results demonstrate the strength of our new technique in dealing with the state-explosion problem.