15 research outputs found

    Problématiques d'ordonnancement et de planification pour un système de production de shampoings

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    Les systèmes de production représentent un domaine privilégié d’application des techniques issues de la recherche opérationnelle. Organiser le flux de produit dans un tel système est une tâche complexe : le nombre de contraintes à prendre en compte est généralement élevé et les données peuvent s’avérer être incertaines (il est difficile de connaître précisément la quantité de produit qui sera vendu dans plusieurs semaines ou plusieurs mois). Pour pouvoir organiser efficacement le flux de produit, l’organisation du flux est scindé en trois phases distincts : la phase stratégique, la phase de planification et enfin la phase opérationnelle. Cette thèse porte sur l’étude des deux dernières phases pour un site de production de shampoings.Systems of production represent a privileged area of application of techniques from operational research. Organizing the product flow in such a system is a complex task : the number of constraints to take into account is generally high and the data can be uncertain (it is difficult to know precisely the amount of product that will be sold in several weeks or months). To be able to effectively organize the product flow, the organization is divided into three distinct phases : the strategic phase, the planning phase and operational phase. This thesis focuses on the last two phases for a shampoo production site

    Problématiques d'ordonnancement et de planification pour un système de production de shampoings

    No full text
    Les systèmes de production représentent un domaine privilégié d application des techniques issues de la recherche opérationnelle. Organiser le flux de produit dans un tel système est une tâche complexe : le nombre de contraintes à prendre en compte est généralement élevé et les données peuvent s avérer être incertaines (il est difficile de connaître précisément la quantité de produit qui sera vendu dans plusieurs semaines ou plusieurs mois). Pour pouvoir organiser efficacement le flux de produit, l organisation du flux est scindé en trois phases distincts : la phase stratégique, la phase de planification et enfin la phase opérationnelle. Cette thèse porte sur l étude des deux dernières phases pour un site de production de shampoings.Systems of production represent a privileged area of application of techniques from operational research. Organizing the product flow in such a system is a complex task : the number of constraints to take into account is generally high and the data can be uncertain (it is difficult to know precisely the amount of product that will be sold in several weeks or months). To be able to effectively organize the product flow, the organization is divided into three distinct phases : the strategic phase, the planning phase and operational phase. This thesis focuses on the last two phases for a shampoo production site.TOURS-Bibl.électronique (372610011) / SudocSudocFranceF

    An efficient heuristic for medium-term planning in shampoo production

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    International audienceThis paper presents a single machine problem which occurs in shampoo production at medium-term planning phase. The considered production plant is linked to subsidiary companies which are themselves linked to final customers. The aim is to answer subsidiary companies requests by keeping their stocks in a window defined by their safety stock and maximum inventory levels. After an introduction, we present a formal definition of the problem. Next, we present a two-phase heuristic algorithm: the first phase is based on a greedy algorithm and the second phase on the Goldberg and Tarjan algorithm for the minimum cost flow problem. Experimental testings close to industrial instances show that the heuristic performs very efficiently

    Solution of a multicriteria shampoo production problem

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    International audienceThis article presents a tri-criteria industrial problem which takes place in shampoo production. After an introduction of the industrial context, we develop the problem formulation and resent two mixed integer programs. The first is the most natural since it directly translates into mathematical terms all the constraints introduced in the problem formulation. The second model uses a trick to eliminate some variables and constraints. After this mathematical presentation, we focus on a heuristic which minimizes one of the three criteria. At last, we compare numerical results obtained by the solution of the two mathematical models and the heuristi

    Rescheduling for new orders with setup times

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