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Deadlock Prevention for a Class of Petri Nets With Uncontrollable and Unobservable Transitions

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5 Author(s)
Meng Qin ; Sch. of Electro-Mech. Eng., Xidian Univ., Xi''an, China ; Li, Z. ; MengChu Zhou ; Khalgui, M.
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This study deals with deadlock problems in a system with uncontrollable and unobservable events, which is modeled with a subclass of Petri nets. We design monitors to enforce constraints for minimal siphons in a Petri net model. A key point of this paper is how to select the input and output arcs of a monitor when there exist uncontrollable and unobservable transitions. After the enforcement of constraints, an iterative algorithm is developed to obtain a controlled system with liveness. A sufficient and necessary condition is established to decide the existence of a monitor enforcing a constraint in a plant with uncontrollable and unobservable transitions.

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Systems, Man and Cybernetics, Part A: Systems and Humans, IEEE Transactions on  (Volume:42 ,  Issue: 3 )