Lot Sizing Problems
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. COMPARISON OF MIP MODELS FOR THE INTEGRATED LOT-SIZING AND ONE-DIMENSIONAL CUTTING STOCK PROBLEM
ABSTRACT Production processes comprising both the lot-sizing problem and the cutting stock problem are frequent in various industrial sectors. However these problems are usually treated separately, which can generates suboptimal overall solution and consequently causes production losses. In this paper, we propose different mathematical models for the integra
Pesqui. Oper.. Publicado em: 2016-04
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2. JOINT OPTIMIZATION OF PRODUCTION PLANNING AND VEHICLE ROUTING PROBLEMS: A REVIEW OF EXISTING STRATEGIES
Keen competition and increasingly demanding customers have forced companies to use their resources more efficiently and to integrate production and transportation planning. In the last few years more and more researchers have also focused on this challenging problem by trying to determine the complexity of the individual problems and then developing fast and
Pesqui. Oper.. Publicado em: 2014-08
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3. A review of three decades of research on some combinatorial optimization problems
This paper presents an overview of our research in combinatorial optimization problems. Over the last three decades, our team has been studying mostly optimization problems that arise in industrial environments through the elaboration and solution of mathematical decision models. In addition to elaborating innovative models, we have improved upon existing so
Pesqui. Oper.. Publicado em: 2013-04
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4. Local branching aplicado ao problema de dimensionamento de lotes / Local branching applied on lot-sizing problems
O planejamento da produção é uma atividade que avalia decisões para um melhor uso dos recursos disponíveis, visando satisfazer aos objetivos produtivos da empresa ao longo de um horizonte de planejamento. Este trabalho enfoca o problema de dimensionamento de lotes com restrições de capacidade (PDLC), que é uma das tarefas centrais envolvidas no plane
Publicado em: 2010
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5. A programação de produção em fundições de pequeno porte: modelagem matemática e métodos de solução / The production planning is small-driven foundries: mathematical modeling and solution methods
Este trabalho trata de um problema de programação da produção em fundições de pequeno porte, que consiste em programar as ligas que devem ser produzidas em cada período do planejamento e como tais ligas devem ser usadas para a produção de itens sob encomenda, de modo que atrasos e custos operacionais sejam minimizados. Devido à certa incerteza nos
Publicado em: 2007
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6. An heuiristic for the lot sizing problem in small market-driven foundries / Uma heurística para o problema de dimensionamento de lotes em fundições de mercado
The foundry sector is important to the economy as it produces basic components for many other sectors, to such an extent that its performance has a repercussion in other sectors. A recently published mixed integer-programming model for small market-driven foundries, which aims to minimize delays when delivering orders, was proposed in the literature. In this
Publicado em: 2006
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7. Otimização do processo de corte integrado à produção de bobinas - modelos e métodos de solução / Coupling cutting stock and lot sizing problems in the paper industry: mathematical model and solution methods
An important production programming problem arises in paper industries coupling mul- tiple machine scheduling with cutting stock. From machine scheduling the problem of determining the quantity of jumbos (large rolls of paper) of different types of paper to be produced in each machine arises. These jumbos are then cut to meet the demand for items (smaller ro
Publicado em: 2006
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8. Abordagens para o problema integrado de dimensionamento e sequenciamento de lotes da produção de bebidas.
The object of this study is the integrated problem of lot sizing and scheduling of the soft drink production. Such problem consists of deciding how much to produce of each drink and in each period and in which sequence, in order to satisfy the demand and to minimize the costs of storage, backlogging and changeover. The set up times of the machines are sequen
Publicado em: 2006
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9. Otimização do planejamento da produção em sistemas multiestagios
t: Lot-sizing multistage problems consist in the deterrnination of the quantities to be produced in different periods of time to meet forecast demando The model considers capacity restrictions on resources and product structure, i.e., the products may depend on the purchase or the production of certain components. The model presented uses the concept of eche
Publicado em: 1993
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10. Problemas multi-estagios de dimensionamento de lotes com tempo não-zero de produção e capacidade finita
Hulti-Stage Lot-Sizing Problems with Non-Zero Lead Time are formulated as Integer Programming models in a manner suitable for use with a rolling planning horizon in capacitated and uncapacitated Material Requirements Planning systems. Two solution approcehes, one of strong euts and another that uses Lagrangian Relaxation are developed. Computational results
Publicado em: 1990