Supervisory control of a class of discrete event processes
SIAM Journal on Control and Optimization
Memory-efficient algorithms for the verification of temporal properties
Formal Methods in System Design - Special issue on computer-aided verification: general methods
The complexity of mean payoff games on graphs
Theoretical Computer Science
Efficient algorithms for optimum cycle mean and optimum cost to time ratio problems
Proceedings of the 36th annual ACM/IEEE Design Automation Conference
On an Optimization Problem in Sensor Selection
Discrete Event Dynamic Systems
Synthesis Of Optimal-Cost Dynamic Observers for Fault Diagnosis of Discrete-Event Systems
TASE '07 Proceedings of the First Joint IEEE/IFIP Symposium on Theoretical Aspects of Software Engineering
Sensor Minimization Problems with Static or Dynamic Observers for Fault Diagnosis
ACSD '07 Proceedings of the Seventh International Conference on Application of Concurrency to System Design
Active Acquisition of Information for Diagnosis and Supervisory Control of Discrete Event Systems
Discrete Event Dynamic Systems
Algorithms for omega-regular games with imperfect information
CSL'06 Proceedings of the 20th international conference on Computer Science Logic
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We study sensor minimization problems in the context of fault diagnosis. Fault diagnosis consists in synthesizing a diagnoser that observes a given plant and identifies faults in the plant as soon as possible after their occurrence. Existing literature on this problem has considered the case of fixed static observers, where the set of observable events is fixed and does not change during execution of the system. In this paper, we consider static observers where the set of observable events is not fixed, but needs to be optimized (e.g., minimized in size). We also consider dynamic observers, where the observer can "switch" sensors on or off, thus dynamically changing the set of events it wishes to observe. It is known that checking diagnosability (i.e., whether a given observer is capable of identifying faults) can be solved in polynomial time for static observers, and we show that the same is true for dynamic ones. On the other hand, minimizing the number of (static) observable events required to achieve diagnosability is NP-complete. We show that this is true also in the case of mask-based observation, where some events are observable but not distinguishable. For dynamic observers' synthesis, we prove that amost permissive finite-state observer can be computed in doubly exponential time, using a game-theoretic approach. We further investigate optimization problems for dynamic observers and define a notion of cost of an observer. We show how to compute an optimal observer using results on mean-payoff games by Zwick and Paterson.