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• W2951567270 abstract "We consider a maintenance planner problem to dynamically allocate the available repairmen to a system of unreliable production facilities. Each facility has several machines that incur a linear production loss due to stochastic degradation, which we model as a continuous time Markov process with fully observable states. The objective is to schedule group maintenance interventions, in discrete time epochs, so as to minimize production losses over an infinite horizon. Direct solution procedures, such as dynamic programming value or policy iteration, are impractical due to the curse of dimensionality. An approximate scheduling procedure is developed following Whittle’s restless bandits approach. In particular, we decompose the Whittle’s relaxation of our scheduling problem by production facility (i.e., bandit) using the Lagrangian technique. Based on the structural investigation of a single-bandit problem, we prove indexability and propose a novel index computational algorithm. Our numerical study shows that, for systems with three or four facilities, the index policy has a near-zero optimality gap. For systems with 10 or more facilities, the index policy expected cost remains fairly close to a lower bound that we compute using the known linear programming (LP) formulation of Whittle’s relaxation. Furthermore, the numerical study also shows that our policy yields substantial expected cost improvements relative to a benchmark LP-based heuristic when the states are partially observable and can handle large-scale systems unlike LP-based heuristics, which have excessive memory requirements." @default.
• W2951567270 created "2019-06-27" @default.
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• W2951567270 date "2019-10-01" @default.
• W2951567270 modified "2023-10-11" @default.
• W2951567270 title "Group Maintenance: A Restless Bandits Approach" @default.
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• W2951567270 doi "https://doi.org/10.1287/ijoc.2018.0863" @default.
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