نتایج جستجو برای Lot-sizing

تعداد نتایج: 36729  

2003
PHILIP KAMINSKY, DAVID SIMCHI-LEVI,

We develop a two stage model of a manufacturing supply chain. This two stage production transportation model features capacitated production in two stages, and a fixed cost (or concave cost) for transporting the product between the stages. We prove several properties of this model, which we call the Two Stage Production Distribution Problem (2SPDP) model. By placing “non-speculative” assumption...

Journal: :Oper. Res. Lett. 2008
Alper Atamtürk, Simge Küçükyavuz,

We present an O(n2) dynamic programming algorithm for lot sizing with inventory bounds and fixed costs, where n is the number of time periods. The algorithm utilizes a hierarchy of two layers of value functions and improves the complexity bound of an earlier O(n3) algorithm for concave-cost and bounded inventory. c © 2007 Elsevier B.V. All rights reserved.

2014
X. J. Wang, S. H. Choi,

There is a growing consensus that human beings must cut greenhouse gas emissions to mitigate global warming and the resultant impacts on the environment. However, production optimisation has rarely taken this issue into consideration, often leading to environmentally unsustainable operation decisions. This paper presents a lot sizing batch optimisation model for a stochastic make-toorder produc...

Journal: :Operations Research 2013
Hark-Chin Hwang, Hyun-Soo Ahn, Philip Kaminsky,

We consider the multilevel lot-sizing problem with production capacities (MLSP-PC), in which production and transportation decisions are made for a serial supply chain with capacitated production and concave cost functions. Existing approaches to the multistage version of this problem are limited to nonspeculative cost functions—up to now, no algorithm for the multistage version of this model w...

2016
Stefano Coniglio, Arie M. C. A. Koster, Nils Spiekermann,

We consider a variant of the single item lot sizing problem where the product, when stored, suffers from a proportional loss, and in which the product demand is affected by uncertainty. This setting is particularly relevant in the energy sector, where the demands must be satisfied in a timely manner and storage losses are, often, unavoidable. We propose a two-stage robust optimization approach ...

2017
Shi Li,

We study the non-uniform capacitated multi-item lot-sizing (CMILS) problem. In this problem, there is a set of demands over a planning horizon of T time periods and all demands must be satisfied on time. We can place an order at the beginning of each period s, incurring an ordering cost Ks. The total quantity of all products ordered at time s can not exceed a given capacity Cs. On the other han...

1998
Michael R. Bussieck, Andreas Fink, Marco E. Lübbecke,

In “An Efficient Zero-One Formulation of the Multilevel Lot-Sizing Problem” [8] MCKNEW, SAYDAM, and COLEMAN claim the polynomial solvability of this particular production planning problem. Both, the proof given by MCKNEW et al. and a statement of its incorrectness by RAJAGOPALAN [10] contain errors, and the question remains whether the approach leads to a polyomial time algorithm. We show by me...

Journal: :European Journal of Operational Research 2010
Christian Almeder,

Solving multi-level capacitated lot-sizing problems is still a challenging task, despite of increasing computational power and faster algorithms. In this paper a new approach combining an ant-based algorithm with an exact solver for (mixed-integer) linear programs is presented. A MAX-MIN ant system is developed to determine the principle production decisions, a LP/MIP solver is used to calculat...

2015
Diana Puspita Sari, Ahmad Rusdiansyah, Liqun Huang,

In this research we develop mathematical models of Joint Economic Lot-sizing Problem (JELP) in a situation when a supplier offers time-based temporary price discounts to a buyer during a sale period. To respond this, the buyer places a special order with higher quantity. In literature, it has been assumed that the buyer tends to place the special order at the end of the sale period. We relax th...

Journal: :JORS 2016
Flavio Molina, Reinaldo Morabito, Silvio A. de Araujo,

This study presents mixed integer programming (MIP) models for production lot-sizing problems with distribution costs using unit load devices such as pallets and containers. Problems that integrate production lot-sizing decisions and loading of the products in vehicles (bins) are also modelled, in which constraints such as weight limits, volume restrictions or the value of the cargo loaded in t...

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