On an Economic Lot Scheduling Problem under an Imperfect Production Process with Reworks and Raw Materia
| Autor: | Jhin-Yong Lin, 林智勇 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 This research focuses on solving the Economic Lot Scheduling Problem (ELSP) under an imperfect production process that includes joint material replenishment, in-production screening process, imperfect rework process, scraps and shortage. The aging of a production facility may deteriorate the production process and the facility may shift to an out-of-control state wherein nonconforming items are produced. All defective items, which are defected by the screening process, may be reworked immediately after the production process finishes. However, since the rework process is imperfect, scraps are produced during the rework processes. The ELSP, in a deteriorating production system, is formulated by the Common Cycle (CC) approach. The objective is to determine near-optimal solutions, which include a common production cycle time and replenishment cycles of raw materials, for minimizing the expected total cost per unit time. Three problem solving procedures are developed to find near-optimal solutions for the proposed model. To demonstrate the model, the study provides a numerical example that illustrates the derivation of the solutions. Sensitivity analysis is also performed and discussed. The results show that the proposed deterministic model can provide managers with guidelines for evaluating the proper production cycle time and the purchase quantity of raw materials under a joint material replenishment policy. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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