Mathematical theory of improvability of production systems.
Méthode heuristique pour le problème de flow shop hybride avec machines dédiées
Dans ce papier, nous traitons le problème de minimisation du makespan dans un flow shop hybride à deux étages avec machines dédiées. En premier lieu, nous présentons des propriétés de base, un ensemble de bornes inférieures et deux cas polynomiaux. En second lieu, nous proposons une nouvelle heuristique qui exploite ces propriétés, et cherche à placer les jobs, en tenant compte pour chaque instance du problème, de la valeur de la borne inférieure. La dernière partie de ce travail présente les résultats expérimentaux...
Methods for estimating vehicle queues at a marine terminal: a computational comparison
Método primal dual para modelos de planificación con costes cóncavos y limitaciones de capacidad.
Este trabajo estudia el problema de planificación de la producción representado por un modelo de costes cóncavos sujeto a limitaciones de capacidad. La relajación lineal del modelo es analizada usando un enfoque primal-dual. Las soluciones del dual se obtienen resolviendo para cada producto modelos sin restricciones de capacidad asignando un precio a las mismas. El primal reducido supone un test de admisibilidad de dichas soluciones. El dual reducido permite calcular los nuevos precios recomendados...
Minimization of communication expenditure for seasonal products
We consider a firm that sells seasonal goods. The firm seeks to reach a fixed level of goodwill at the end of the selling period, with the minimum total expenditure in promotional activities. We consider the linear optimal control problem faced by the firm which can only control the communication expenditure rate; communication is performed by means of advertising and sales promotion. Goodwill and sales levels are considered as state variables and word-of-mouth effect and saturation aversion are...
Minimization of communication expenditure for seasonal products
We consider a firm that sells seasonal goods. The firm seeks to reach a fixed level of goodwill at the end of the selling period, with the minimum total expenditure in promotional activities. We consider the linear optimal control problem faced by the firm which can only control the communication expenditure rate; communication is performed by means of advertising and sales promotion. Goodwill and sales levels are considered as state variables and word-of-mouth effect and saturation aversion are...
MIP-based heuristics for multi-item capacitated lot-sizing problem with setup times and shortage costs
We address a multi-item capacitated lot-sizing problem with setup times that arises in real-world production planning contexts. Demand cannot be backlogged, but can be totally or partially lost. Safety stock is an objective to reach rather than an industrial constraint to respect. The problem is NP-hard. We propose mixed integer programming heuristics based on a planning horizon decomposition strategy to find a feasible solution. The planning horizon is partitioned into several sub-horizons over...
Modèle mathématique d'ordonnancement de fabrication en série
Modélisation géométrique de la faisabilité de plusieurs mélanges
Modelización de un DSS para la gestión de productos perecederos.
La gestión de inventarios de productos perecederos ha atraído desde hace tiempo la atención de los investigadores de Dirección de Operaciones. En este artículo se presenta la modelización e implementación de un sistema de apoyo a la toma de decisiones (DSS) para la gestión de productos perecederos, aplicado a la distribución interhospitalaria de hemoderivados. En estos casos se trata de satisfacer en lo posible las demandas, tratando de evitar a la vez la caducidad de los productos en manos de los...
Models of Production Runs for Multiple Products in Flexible Manufacturing System
Modular production line optimization: The exPLOre architecture.
MOPP-I: an optimization package for multipurpose batch operations.
A number of algorithms have been developed -including enumeration of feasible production sequences, alternative task selection and the generation of alternative production lines- to determine the optimal sequence in which products and by-products should be produced and the times at which the various production operations for each product should be carried out to meet a given product demand pattern, taking into account the available equipment, storage costs, stopover penalties and other plant limitations.Product...
Multi-criteria approach to comparison of inspection allocation for multi-product manufacturing systems in make-to-order sector
Multi-working modes product-color planning based on evolutionary algorithms and swarm intelligence.