Switched Probabilistic I/O Automata

L. Cheung, N.A. Lynch, R. Segala and F.W. Vaandrager. Switched Probabilistic I/O automata. In Z. Liu and K. Araki, editors. Proceedings First International Colloquium on Theoretical Aspects of Computing (ICTAC2004), Guiyang, China 20 - 24 September 2004. LNCS 3407, p 494-510. Springer Verlag, 2005. Full version available as Technical Report NIII-R0437, NIII, Radboud University Nijmegen, September 2004.


A switched probabilistic I/O automaton is a special kind of probabilistic I/O automaton (PIOA), enriched with an explicit mechanism to exchange control with its environment. Every closed system of switched automata satisfies the key property that, in any reachable state, at most one component automaton is active. We define a trace-based semantics for switched PIOAs and prove it is compositional. We also propose switch extensions of an arbitrary PIOA and use these extensions to define a new trace-based semantics for PIOAs.

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Slides talk at FMCO'04, Leiden, November 2004