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Magnetic shielding effectiveness of grain oriented electrical steel was studied at 0.01-100 kHz magnetic fields. The frequency dependent effectiveness was clarified as to material anisotropy of <100> and <110> in circumferential direction of cylindrical shields. The effectiveness showed the difference over 50kHz between the shields of <100> and <110> before and after stree-relief...
Petri net model is a widely used versatile tool which can represent a discrete event system such as mechanical system, communication system and production system. A variety of optimization problems can be formulated as the optimal firing sequence problem for Petri nets, because this model is excellent in generality and in expression ability. However, when the size of the targeted model becomes large,...
Petri net model is a widely used versatile tool which can represent a discrete event system such as mechanical system, communication system and production system. A variety of optimization problems can be formulated as the optimal firing sequence problem for Petri Nets, because this model is excellent in generality and in expression ability. However, when the size of the targeted model becomes large,...
Petri net model is a widely used versatile tool which can represent a discrete event system such as mechanical system, communication system, and production system. The merit of this model is easiness in handling. Other merit of the model is descriptive easiness in parallel, synchronous operations. In addition, it is applicable to a wide variety of discrete event system due to its excellence in the...
In this paper, we propose a decomposition and optimization method for Petri nets to solve routing problems for automated guided vehicles in semiconductor fabrication bays. An augmented Petri net model is developed to represent concurrent motion for multiple AGVs. The routing problem to minimize total transportation time is formulated as an optimal firing sequence problem for the proposed Petri net...
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