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Numerical Evaluation Of Heuristics For The Multi Item Single Level Capacitated Lot Size Problem
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Book Synopsis Numerical Evaluation of Heuristics for the Multi-item Single-level Capacitated Lot-size Problem by : Hans-Otto Günther
Download or read book Numerical Evaluation of Heuristics for the Multi-item Single-level Capacitated Lot-size Problem written by Hans-Otto Günther and published by . This book was released on 1987 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multi-level Capacitated Lotsizing with Setup Carryover by : Lisbeth Buschkühl
Download or read book Multi-level Capacitated Lotsizing with Setup Carryover written by Lisbeth Buschkühl and published by Kölner Wissenschaftsverlag. This book was released on 2008 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Multi-level Multi-item Capacitated Lot Sizing Problem (MLCLSP) Model by : Supakanya Chinprateep
Download or read book A Multi-level Multi-item Capacitated Lot Sizing Problem (MLCLSP) Model written by Supakanya Chinprateep and published by . This book was released on 2008 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research was motivated by problems arising from manufacturing of end product from various raw materials. The firm also needs to take into account of other factors, for example: workstation capacity changes over time period; warehouse capacity; raw materials are affected by either availability or price and etc. The purchasing and production planning in multi-item multi-period multi-workstation capacitated lot size situation is discussed and formulated as a Mixed Integer Programming model (MIP) and can be called as a Multi-item Multi-level capacitated lot size with multi-workstation problem (MLCLSP-M). With too complexity of the solving large problem, three heuristic methods are developed, tested and compared based on standard library, illustrating the solution quality and computational time. The proposed heuristics are Assignment-Lot size heuristic (A-LS), Partial Assignment - Lot size (PA-LS), and Max Cover Period - Lot size (MCP-LS). These methods are based on the decomposition of the MLCLSP-M into two phases consisting of an assignment with given lot size phase and a lot size with given assignment phase. Each iteration, the sub problem mathematical models are solved with AMPL/CPLEX 8.0.0 solver. Computational test results are analyzed and discussed on performance and running time. On comparing with the original mathematical model solving, the results indicate that the A-LS heuristic gives a satisfactory solution with very fast solving time, the PA-LS heuristic gives a closely optimal solution with very long solving time, and the MCP-LS gives a good solution with medium solving time.
Book Synopsis Asian-Pacific Operations Research, APORS '88 by : Byong-Hun Ahn
Download or read book Asian-Pacific Operations Research, APORS '88 written by Byong-Hun Ahn and published by North Holland. This book was released on 1990 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its founding as a regional network represented by eight member countries, the growth and development of APORS (the Association of Asian-Pacific Operational Research Societies) has been as rapid as the speed of socio-economic transformation occurring in this same, very dynamic region. With a view to developing operations research in this area, APORS '88 (the first conference organized by the APORS) provided a valuable opportunity for participants to share experiences and expertise in operations research and management science. The contributions included in this work are edited versions of a selection of those papers presented at APORS '88.
Book Synopsis Fix-and-optimize Heuristic and MP-based Approaches for Capacitated Lot Sizing Problem with Setup Carryover, Setup Splitting and Backlogging by : Cheng-Lung Chen
Download or read book Fix-and-optimize Heuristic and MP-based Approaches for Capacitated Lot Sizing Problem with Setup Carryover, Setup Splitting and Backlogging written by Cheng-Lung Chen and published by . This book was released on 2015 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, a single-level, multi-item capacitated lot sizing problem with setup carryover, setup splitting and backlogging is investigated. This problem is typically used in the tactical and operational planning stage, determining the optimal production quantities and sequencing for all the products in the planning horizon. Although the capacitated lot sizing problems have been investigated with many different features from researchers, the simultaneous consideration of setup carryover and setup splitting is relatively new. This consideration is beneficial to reduce costs and produce feasible production schedule. Setup carryover allows the production setup to be continued between two adjacent periods without incurring extra setup costs and setup times. Setup splitting permits the setup to be partially finished in one period and continued in the next period, utilizing the capacity more efficiently and remove infeasibility of production schedule.The main approaches are that first the simple plant location formulation is adopted to reformulate the original model. Furthermore, an extended formulation by redefining the idle period constraints is developed to make the formulation tighter. Then for the purpose of evaluating the solution quality from heuristic, three types of valid inequalities are added to the model. A fix-and-optimize heuristic with two-stage product decomposition and period decomposition strategies is proposed to solve the formulation. This generic heuristic solves a small portion of binary variables and all the continuous variables rapidly in each subproblem. In addition, the case with demand backlogging is also incorporated to demonstrate that making additional assumptions to the basic formulation does not require to completely altering the heuristic.The contribution of this thesis includes several aspects: the computational results show the capability, flexibility and effectiveness of the approaches. The average optimality gap is 6% for data without backlogging and 8% for data with backlogging, respectively. In addition, when backlogging is not allowed, the performance of fix-and-optimize heuristic is stable regardless of period length. This gives advantage of using such approach to plan longer production schedule. Furthermore, the performance of the proposed solution approaches is analyzed so that later research on similar topics could compare the result with different solution strategies.
Book Synopsis International journal of production economics by :
Download or read book International journal of production economics written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Applied Mechanical Engineering by : Hari Kumar Voruganti
Download or read book Advances in Applied Mechanical Engineering written by Hari Kumar Voruganti and published by Springer Nature. This book was released on 2020-02-01 with total page 1161 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents select peer reviewed proceedings of the International Conference on Applied Mechanical Engineering Research (ICAMER 2019). The books examines various areas of mechanical engineering namely design, thermal, materials, manufacturing and industrial engineering covering topics like FEA, optimization, vibrations, condition monitoring, tribology, CFD, IC engines, turbo-machines, automobiles, manufacturing processes, machining, CAM, additive manufacturing, modelling and simulation of manufacturing processing, optimization of manufacturing processing, supply chain management, and operations management. In addition, recent studies on composite materials, materials characterization, fracture and fatigue, advanced materials, energy storage, green building, phase change materials and structural change monitoring are also covered. Given the contents, this book will be useful for students, researchers and professionals working in mechanical engineering and allied fields.
Book Synopsis Reverse Logistics by : Rommert Dekker
Download or read book Reverse Logistics written by Rommert Dekker and published by Springer Science & Business Media. This book was released on 2013-06-05 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses decision making in reverse logistics, which concerns the integration of used and obsolete products back into the supply chain as valuable resources. It covers a wide range of aspects, related to distribution, production and inventory management, and supply chain management. For each topic, it highlights key managerial issues in real-life examples and explains which quantitative models are available for addressing them. By treating a broad range of issues in a unified way, the book offers the reader a comprehensive view on the field of reverse logistics.
Book Synopsis Multi-Level Lot Sizing and Scheduling by : Alf Kimms
Download or read book Multi-Level Lot Sizing and Scheduling written by Alf Kimms and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the outcome of my research in the field of multi levellot sizing and scheduling which started in May 1993 at the Christian-Albrechts-University of Kiel (Germany). During this time I discovered more and more interesting aspects ab out this subject and I had to learn that not every promising idea can be thoroughly evaluated by one person alone. Nevertheless, I am now in the position to present some results which are supposed to be useful for future endeavors. Since April 1995 the work was done with partial support from the research project no. Dr 170/4-1 from the "Deutsche For schungsgemeinschaft" (D FG). The remaining space in this preface shaH be dedicated to those who gave me valuable support: First, let me express my deep gratitude towards my thesis ad visor Prof. Dr. Andreas Drexl. He certainly is a very outstanding advisor. Without his steady suggestions, this work would not have come that far. Despite his scarce time capacities, he never rejected proof-reading draft versions of working papers, and he was always willing to discuss new ideas - the good as weH as the bad ones. He and Prof. Dr. Gerd Hansen refereed this thesis. I am in debted to both for their assessment. I am also owing something to Dr. Knut Haase. Since we al most never had the same opinion when discussing certain lot sizing aspects, his comments and criticism gave stimulating input.
Book Synopsis Optimal and Heuristic Lot-sizing Procedures for Multi-stage Manufacturing Systems by : Jaya P. Moily
Download or read book Optimal and Heuristic Lot-sizing Procedures for Multi-stage Manufacturing Systems written by Jaya P. Moily and published by . This book was released on 1982 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Dual-based Heuristic for the Capacitated Lot Sizing Problem by : William W. Trigeiro
Download or read book A Dual-based Heuristic for the Capacitated Lot Sizing Problem written by William W. Trigeiro and published by . This book was released on 1985 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic lot sizing problems with stochastic production output by : Michael Kirste
Download or read book Dynamic lot sizing problems with stochastic production output written by Michael Kirste and published by BoD – Books on Demand. This book was released on 2017-06-23 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the real world, production systems are affected by external and internal uncertainties. Stochastic demand - an external uncertainty - arises mainly due to forecast errors and unknown behavior of customers in future. Internal uncertainties occur in situations where random yield, random production capacity, or stochastic processing times affect the productivity of a manufacturing system. The resulting stochastic production output is especially present in industries with modern and complex technologies as the semiconductor industry. This thesis provides model formulations and solution methods for capacitated dynamic lot sizing problems with stochastic demand and stochastic production output that can be used by practitioners within Manufacturing Resource Planning Systems (MRP), Capacitated Production Planning Systems (CPPS), and Advanced Planning Systems (APS). In all models, backordered demand is controlled with service levels. Numerical studies compare the solution methods and give managerial implications in presence of stochastic production output. This book addresses practitioners, consultants, and developers as well as students, lecturers, and researchers with focus on lot sizing, production planning, and supply chain management.
Book Synopsis An Evaluation of Twelve Single-level Discrete-demand Lot-sizing Heuristics by : B. L. Heemsbergen
Download or read book An Evaluation of Twelve Single-level Discrete-demand Lot-sizing Heuristics written by B. L. Heemsbergen and published by . This book was released on 1984 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Boctor, Fayez F. (Fayez Fouad) Publisher :Québec : Faculté des sciences de l'administration de l'Université Laval, Direction de la recherche ISBN 13 : Total Pages :18 pages Book Rating :4.:/5 (773 download)
Book Synopsis The Multi-product, Economic Lot Sizing Problem in Flow Shops : the Powers-of-two Heuristic by : Boctor, Fayez F. (Fayez Fouad)
Download or read book The Multi-product, Economic Lot Sizing Problem in Flow Shops : the Powers-of-two Heuristic written by Boctor, Fayez F. (Fayez Fouad) and published by Québec : Faculté des sciences de l'administration de l'Université Laval, Direction de la recherche. This book was released on 1998 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Heuristic Lot-sizing/scheduling Methodology of a Multi-stage Capacitated Production System by Using Load Families by : Woo Seok Chae
Download or read book A Heuristic Lot-sizing/scheduling Methodology of a Multi-stage Capacitated Production System by Using Load Families written by Woo Seok Chae and published by . This book was released on 1988 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heuristic Strategies for the Single-Item Lot-Sizing Problem with Convex Variable Production Cost by : Xin Liu
Download or read book Heuristic Strategies for the Single-Item Lot-Sizing Problem with Convex Variable Production Cost written by Xin Liu and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Heuristic Strategies for the Single-item Lot-sizing Problem With Convex Variable Production Cost" by Xin, Liu, 劉忻, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Heuristic Strategies for the Single-Item Lot-Sizing Problem with Convex Variable Production Cost Submitted by Liu Xin For the Degree of Master of Philosophy at the University of Hong Kong in September 2005 This research is about the stochastic single-item lot-sizing problem, whose objective is to determine the quantities that will be produced in specific production periods so that the total production quantity will satisfy the demands while the total cost will be minimized. Particularly, the type of problem studied in this research is concerned with production with convex variable production costs. The costs involved in the computation of optimal lot sizes include the set-up cost for every occurrence of a production, the holding cost for products which are finished before their due date, the penalty cost for orders that are not satisfied on time and are therefore backordered, and the "excess capacity" cost for products that are produced by exceeding the regular capacity. Unfortunately, the search for optimal lot-sizing policy of the lot-sizing problem in this research is always found to be elusive. The computational effort for solving even small-scale problems is prohibitively large. This research is based on the work of Dellaert and Melo on the use of the Markov 3decision model for establishing the optimal policy. However, instead of obtaining the optimal solution in general, which is too complex in most practical situations, three approximate strategies including (, xTw, )-rule, the modified (, xTw, ) -rule and the least-cost-per-period (LCP) policy are proposed for obtaining good production lot sizes. The first one is a production strategy where the demands for a certain number of periods are produced with a fixed number of units produced for a non-dedicated stock. The second rule, which is a variation of the (, xTw, ) -rule, permits at most one period's demand to be satisfied. Particularly, it allows production using means (e.g., overtime or subcontracting) that exceeds the plant's regular capacity and therefore may reduce the holding and overtime cost. The third lot-sizing strategy is based on the well-known Silver-Meal algorithm but it differs from the latter with the consideration of cases that have backlogs and actions for future coming demands. A comprehensive set of test problems covering a wide variety of demand and cost parameters is used to compare the performance of the three proposed lot-sizing strategies. The numerical study reveals that the interaction of the cost, demand patterns and the regular capacity influences the performance of the heuristic strategies in such a way that in general there is no dominance of one rule over the others in every case. Also, the newly developed strategies have been shown to produce good performances. 4 DOI: 10.5353/th_b3642917 Subjects: Economic lot size - Mathematical models Production planning - Mathematical models Markov processes
Book Synopsis Production Planning by Mixed Integer Programming by : Yves Pochet
Download or read book Production Planning by Mixed Integer Programming written by Yves Pochet and published by Springer Science & Business Media. This book was released on 2006-04-19 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides a comprehensive modeling, reformulation and optimization approach for solving production planning and supply chain planning problems, covering topics from a basic introduction to planning systems, mixed integer programming (MIP) models and algorithms through the advanced description of mathematical results in polyhedral combinatorics required to solve these problems. Based on twenty years worth of research in which the authors have played a significant role, the book addresses real life industrial production planning problems (involving complex production structures with multiple production stages) using MIP modeling and reformulation approach. The book provides an introduction to MIP modeling and to planning systems, a unique collection of reformulation results, and an easy to use problem-solving library. This approach is demonstrated through a series of real life case studies, exercises and detailed illustrations. Review by Jakub Marecek (Computer Journal) The emphasis put on mixed integer rounding and mixing sets, heuristics in-built in general purpose integer programming solvers, as well as on decompositions and heuristics using integer programming should be praised... There is no doubt that this volume offers the present best introduction to integer programming formulations of lotsizing problems, encountered in production planning. (2007)
