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This paper considers the deadlock prevention problem for a class of conjunctive/disjunctive resource allocation systems (C/D-RAS) in which multiple resource acquisitions and flexible routings are allowed. The proposed policy is developed in a generalized Petri net framework by an iterative algorithm. Each iteration uses a mixed integer programming (MIP) formulation to find both a bad marking and insufficiently marked siphon. Two new strategies are then presented. One aims to maximize the permissiveness of a liveness-enforcing supervisor while another to minimize the computational and supervisor's complexity. Experimental results validate the effectiveness of these two strategies.
Date of Conference: 12-15 Oct. 2008