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Scheduling policies in flexible Bernoulli lines with dedicated finite buffers
Park, Kyungsu,Li, Jingshan,Feng, Shaw C. Elsevier 2018 Journal of manufacturing systems Vol.48 No.1
<P><B>Abstract</B></P> <P>This paper is devoted to studying scheduling policies in flexible serial lines with two Bernoulli machines and dedicated finite buffers. Priority, cyclic and work-in-process (WIP)-based scheduling policies are investigated. For small scale systems, exact solutions are derived using Markov chain models. For larger ones, a flexible line is decomposed into multiple interacting dedicated serial lines, and iteration procedures are introduced to approximate system production rate. Through extensive numerical experiments, it is shown that the approximation methods result in acceptable accuracy in throughput estimation. In addition, system-theoretic properties such as asymptotic behavior, reversibility, and monotonicity, as well as impact of buffer capacities are discussed, and comparisons of the scheduling policies are carried out.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An analytical model of scheduling policies in a flexible Bernoulli two-machine line is presented. </LI> <LI> Markov chain and decomposition methods are introduced to evaluate system production rate. </LI> <LI> Three scheduling policies are considered: priority, cyclic, and WIP-based policies. </LI> <LI> Conservation of flow, monotonicity and asymptotic properties are analyzed. </LI> </UL> </P>
Disassembly Information Model for Sustainable Manufacturing
Hanmin Lee,Seongwhan Park,Shaw C. Feng (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Manufacturing industry is facing major challenges, such as resources depletion, global climate change, environmental pollution, and ensuring the social well being of future generations. Reuse and recycle become necessary for sustainable development. Disassembly of end-of-service-life products is a key operation to separate a product into reusable and recyclable parts. This paper describes an information model for disassembly in the Unified Modeling Language. A description of the classes and their relationships on disassembly features, disassembly equipment, disassembly workflow, and operations of separations are included in the paper. A case study on a car suspension design is conducted to test the model.