03360nam a2200421 4500 20260818174626.0 260698 th eng .b10529299 AIT Thesis no. IE-91-9 Wanchai Doungsuwan Production planning and scheduling for injection moulding of pipe fittings Bangkok : Asian Institute of Technology, 1991 64, [65] p. Thesis ; no. IE-91-9 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1991 The present study concerns the development and implementation of production planning and scheduling models for injection moulding of pipe fittings in Thailand. The objective of the study is to minimize the total cost of production, inventory, and shortage. A Hierarchical Production Planning (HPP} approach with three stages is applied to solve this problem. Firstly, due to complexity of a large variety of product types and multi non-identical parallel machines, the product and machine classification are grouped by using technical characteristics, machine capability utilization, and load balancing. Then each group of products and machines is treated as a multi product and one machine subproblem. Secondly, goal programming models are formulated for the product-mix planning of each subproblem under a three month rolling plan period. Linear programming packages are used in the computations, utilizing both mainframe and personal computers. Thirdly, heuristic methods are developed to solve the parallel machine scheduling problem for the first planning month. The heuristic methods are written in Lotus Macro program for personal computer. Finally, the results obtained from the proposed procedure are compared with the existing intuitive procedure. Many aspects of sensitivity analysis are also presented. This study puts emphasis on how these models can be practically implemented. Production planning Pipe-fittings Nagarur, Nagendra N., Chairperson Oudheusden, Dirk L. van, Examination Committee Ramanathan, Krishnamurthy, Examination Committee The Siam Cement Co.,Ltd., Scholarship Donor Asian Institute of Technology. Thesis ; no. IE-91-9 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B17656 .b10529299 mnait s 240404 2 960620 m a s 0 mnait mnait mnarc 20 40 Barcode : 30050003073789 CREATED : 1995-10-15 RECORD # : i10664129 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003353942 CREATED : 1995-10-15 RECORD # : i10664130 LPATRON : 1014868 LCHKIN : 2003-02-12 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 4 TOT RENEW : 0 Barcode : 30050160075890 CREATED : 2016-04-20 RECORD # : i12942212 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 94101 94101 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. IE-91-9 30050003073789 2026-08-18 17:46:26 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. IE-91-9 30050003353942 2026-08-18 17:46:26 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. IE-91-9 30050160075890 2026-08-18 17:46:26 2026-08-18 40