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Bisimilarity Control under Partial Observation of Deterministic Discrete Event Systems

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2 Author(s)
Changyan Zhou ; Department of Electrical & Computer Engineering, Iowa State University, Ames, IA 50014, czhou@iastate.edu ; Kumar, R.

The complexity of the general bisimilarity control problem under partial observation is doubly exponential in the product of the plant and the specification sizes [7]. In order to identify a special case where the complexity may be more manageable, we restrict attention to the class of deterministic plants. In this case, the complexity of verifying existence of a controller turns out to be polynomial, whereas that of performing its synthesis is singly exponential. We establish state-controllability (SC) together with state-recognizability (SR) as a necessary and sufficient condition for the existence of a control. The notion of SC was introduced in [8] as an existence condition for the same problem under the restriction of complete observability of events; and it generalizes the notion of language-controllability (LC) from the setting of language-control to bisimilarity-control. In the presence of partial observation, a supervisor is required to be observation-compatible (also called M-compatible), and the additional condition of SR is needed for the existence of such a supervisor. The property of SR is same as bisimilarity with such a system that can be transformed by state-mergers to a M-compatible system, without altering the bisimilarity of the control it exercises. SR generalizes the notion of language-recognizability [1] in a similar manner as SC generalizes LC. We show that SR is polynomially verifiable, and also present an exponential complexity algorithm for synthesizing of a bisimilarity enforcing Supervisor.

Published in:

Decision and Control, 2005 and 2005 European Control Conference. CDC-ECC '05. 44th IEEE Conference on

Date of Conference:

12-15 Dec. 2005

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