Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"lot sizing"”.
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Uncapacitated Lot-Sizing Problems With Setup Interactions
Lot-sizing problems focus on determining a minimal total production cost schedule. These production costs are generally composed of three components: a variable production cost, an inventory holding cost, and a setup cost. The optimal solution balances the holding costs against the setup and …
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Lot-sizing in the wood furniture industry
… of furniture products and determining their lot-sizes for production when there are sequence dependent setup times involved in the production of these items. This is termed the aggregate scheduling problem. In addition, we consider the problem of scheduling work at various production …
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Lot sizing in multi-level multi-echelon inventory system
Typescript (photocopy).
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Dynamic Lot Sizing and Scheduling in a Multi-Item Production System
… are developed to address the problem of dynamic lot sizing and scheduling in a single level (or single operation) production system. This research deviates from previous research in this area in that it does not have the kind of assumptions regarding the real world production system that normally …
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Product availability improvement for analytical column supply chain : inventory optimization and lot sizing
… structured safety stock policy, and an improved lot sizing production policy on the inventory level and service level. The thesis focuses on incorporating demand variability into the factors of determining the safety stock level, and establishing a structured ordering and validation process. The …
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Simultaneous Lot sizing and Lead-time Setting (SLLS)Via Queuing Theory and Heuristic search
… and scheduling. Planned lead-time (PLT) and lot size are two of the input parameters for MRP systems, which determine planned order release dates. Presently, planned lead-time and lot size are estimated using independent methodologies. No existing PLT estimation methods consider factors such …
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Single Level and Multi-Level, Lot Sizing Strategies in Material Requirements Planning Systems (Operations Management)
… deployment of inventory investment. The issue of lot sizing rule has been one of the most heavily addressed topics in the MRP area. Prior research in lot sizing has dealt with single level or multi-level problems with a single parent product structure. However, real world problems frequently …
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Lot Sizing at the Operational Planning and Shop Floor Scheduling Levels of the Decision Hierarchy of Various Production Systems
… work presented in this dissertation relates to lot sizing and its applications in the areas of operational planning and shop floor scheduling and control. Lot sizing enables a proper loading of requisite number of jobs on the machines in order to optimize the performance of an underlying …
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Optimizing lot sizes and establishing supermarkets in a multi-part, limited-capacity manufacturing system
This thesis addresses the value of optimizing lot sizing to meet part demand within the limits of machine capacity, focusing on a method for improving productivity within the CNC turning and CNC milling departments at the Waters Corporation Machining Center in Milford, Massachusetts. A detailed …
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Polynomial Time Algorithms for Transportation and Inventory Management in Serial Supply Chain with Multi-Module Capacitated Vehicles
… new generalizations of the classical capacitated lot-sizing problem with concave production (or transportation), holding, and subcontracting cost functions, in which the total capacity available in each time period is the sum of capacities of a subset of n heterogeneous modules (machines or …
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Multi-stage Stochastic Programming Models in Production Planning
… consider a very simple multi-stage stochastic lot-sizing problem, involving a single item with no fixed charge and capacity constraint. Although a multi-stage stochastic integer program, this problem can be shown to have a totally unimodular constraint matrix. We develop primal and dual …
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Modeling, Analysis and Solution Approaches for Some Optimization Problems: High Multiplicity Asymmetric Traveling Salesman, Primary Pharmaceutical Manufacturing Scheduling, and Lot Streaming in an Assembly System
… as a substructure in our formulation for a lot-sizing problem involving parallel machines and sequence-dependent setup costs, also known as the "Chesapeake Problem". Computational results are presented to demonstrate the efficacy of our modeling approach for both the generic HMATSP and its …
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Optimization tools for process planning
… This MILP can then be reformulated by exploiting lot sizing substructures. While the reformulation produces a tight linear programming relaxation, it also introduces a large number of variables and constraints.
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Unit loads in assembly component delivery
A new way of looking at scheduling and lot sizing is proposed by embedding material handling considerations in the determination of optimum delivery policies for a single stage, uniform demand assembly system in a finite horizon. Unit loads are used in place of lots; material handling and container …
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Fully polynomial time approximation schemes for sequential decision problems
… tackle a more difficult problem; the stochastic lot sizing problem, and give the first fully polynomial time approximation scheme for it. Our approach is based on simple techniques that could arguably have wider applications outside of just designing fully polynomial time approximation schemes.
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Modeling, Analysis, and Exact Algorithms for Some Biomass Logistics Supply Chain Design and Routing Problems
… the literature that lie at the interface of the lot-sizing and routing problems, and in developing effective exact algorithms for their solution. In the routing area, we have addressed extensions of the well-known traveling salesman and vehicle routing problems. We have proposed new formulations …
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Inventory Management and Control "For a Cause"
… operating "for a cause." We investigate lot-sizing rules, material requirements planning (MRP) systems, and mathematical models to determine the inventory order quantity that will minimize costs while guaranteeing a steady amount of labor at a consistent interval. This study will help …
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How to integrate your production and logistics strategy : a new CLSP formulation for a CPG supply chain
… maximizing line efficiency which favors large lot sizes and few setups. On the other hand, logistics strategies prioritize minimizing inventory costs which favors smaller lot sizes and more setups. This thesis provides a new mixed integer linear model formulation that optimizes lot sizes such …
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Sampling based progressive hedging algorithms for stochastic programming problems
… Problem (CRFLP) and Multi-stage stochastic lot-sizing problems.</p>
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