On the complexity of deciding fair termination of probabilistic concurrent finite-state programs
Theoretical Computer Science - Thirteenth International Colloquim on Automata, Languages and Programming, Renne
Properties of Conflict-Free and Persistent Petri Nets
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LICS '05 Proceedings of the 20th Annual IEEE Symposium on Logic in Computer Science
On the Controller Synthesis for Finite-State Markov Decision Processes
Fundamenta Informaticae
ICALP '08 Proceedings of the 35th international colloquium on Automata, Languages and Programming, Part II
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Although randomization often increases the degree of flexibility in system design, analyzing system properties in the probabilistic framework introduces additional difficulties and challenges in comparison with their nonprobabilistic counterparts. In this paper, we focus on probabilistic versions of two problems frequently encountered in discrete event systems, namely, the reachability and forbidden-state problems. Our main concern is to see whether there exists a (or for every) non-blocking or fair control policy under which a given finite- or infinite-state system can be guided to reach (or avoid) a set of goal states with probability one. For finite-state systems, we devise algorithmic approaches which result in polynomial time solutions to the two problems. For infinite-state systems modelled as Petri nets, the problems are undecidable in general. For the class of persistent Petri nets, we establish a valuation approach through which the convergence behavior of a system is characterized, which in turn yields solutions to the reachability and forbidden-state problems.