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# Modeling and Analysis of Re-entrant Production Systems

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 dc.contributor.author Jang, Young Jae dc.contributor.author Gershwin, Stanley B. dc.date.accessioned 2005-12-13T18:17:19Z dc.date.available 2005-12-13T18:17:19Z dc.date.issued 2006-01 dc.identifier.uri http://hdl.handle.net/1721.1/29837 dc.description.abstract This paper presents a model and analysis of a re-entrant production line with finite buffers and unreliable machines. Semiconductor device and liquid crystal display (LCD) fabrication processes are characterized as a re-entrant process, in which a similar sequence of processing step is repeated several times. This re-entrant behavior of material flow with the stochastic nature of the system caused by machine failures or demand changes makes the system difficult predict and analyze. en The decomposition method analyzes the behavior of the manufacturing systems by decomposing a long transfer line into small analytically tractable components, called two-machine line building blocks. Existing decomposition methods are limited to an in-linear production system without re-entrant flow. Since many manufacturing systems, particularly semiconductor and LCD production lines, consist of re-entrant flow paths, it is essential that models be developed to reflect this. The purpose of this paper is to present mathematical formulations and algorithms to analyze the material behavior of the re-entrant production system using the decomposition method. In developing equations for the two-machine building blocks for the re-entrant production line, we modify the existing decomposition model that has been created for the multiple-part type line. Two main performance measures are evaluated with the developed mathematical model: production rate and average inventory levels for each buffer space in the system. The qualitative behavior of the re-entrant production line under different machine parameters and demand scenarios is also described. dc.description.sponsorship Singapore-MIT Alliance (SMA) en dc.format.extent 146042 bytes dc.format.mimetype application/pdf dc.language.iso en en dc.relation.ispartofseries Innovation in Manufacturing Systems and Technology (IMST) en dc.subject re-entrant production line en dc.subject two-machine building blocks en dc.subject decomposition methods en dc.subject liquid crystal display fabrication en dc.subject semiconductor fabrication en dc.title Modeling and Analysis of Re-entrant Production Systems en dc.type Article en
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