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Appl. Sci. 2017, 7(2), 136; doi:10.3390/app7020136

Manufacturing Scheduling Using Colored Petri Nets and Reinforcement Learning

Alexander Technological Educational Institute of Thessaloniki, Department of Automation Engineering, P.O. Box 141, GR-57400 Thessaloniki, Greece
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Academic Editor: Zhiwu Li
Received: 23 December 2016 / Revised: 18 January 2017 / Accepted: 20 January 2017 / Published: 3 February 2017
(This article belongs to the Special Issue Modeling, Simulation, Operation and Control of Discrete Event Systems)
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Abstract

Agent-based intelligent manufacturing control systems are capable to efficiently respond and adapt to environmental changes. Manufacturing system adaptation and evolution can be addressed with learning mechanisms that increase the intelligence of agents. In this paper a manufacturing scheduling method is presented based on Timed Colored Petri Nets (CTPNs) and reinforcement learning (RL). CTPNs model the manufacturing system and implement the scheduling. In the search for an optimal solution a scheduling agent uses RL and in particular the Q-learning algorithm. A warehouse order-picking scheduling is presented as a case study to illustrate the method. The proposed scheduling method is compared to existing methods. Simulation and state space results are used to evaluate performance and identify system properties. View Full-Text
Keywords: agent-based manufacturing scheduling; colored petri nets; reinforcement learning; Q-learning agent-based manufacturing scheduling; colored petri nets; reinforcement learning; Q-learning
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Drakaki, M.; Tzionas, P. Manufacturing Scheduling Using Colored Petri Nets and Reinforcement Learning. Appl. Sci. 2017, 7, 136.

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