Priority allocation decisions in large scale MTO/MTS multi-product manufacturing systems : Technical report

In this paper, the authors consider a single stage multi-product manufacturing facility producing a large number of end-products for delivery within a service constraint for the customer lead-time. The manufacturing facility is modeled as a multi-product, multi-priority queuing system. In order to reduce inventory costs, an e±cient priority allocation between items consists in producing some items according to a Make-To-Stock (MTS) policy and others according to a Make-To-Order (MTO)policy epending on their features (costs, required lead-time, demand rates). The authors propose a general optimization procedure that gives a near-optimal °ow control (MTO or MTS) to associate with each product and the corresponding near-optimal priority strategy. We illustrate e±ciency of our procedure via several examples and by a numerical analysis. In addition, we show numerically that a small number of priority classes is su±cient to obtain near-optimal performances.Make-to-Stock (MTS); Make-to-Order (MTO); Priority allocation; Scheduling rule; Heterogeneous multi-product queuing system

Optimisation de la chaine logistique avec prise en compte de critères de développement durable (Un focus sur les modèles de gestion de stock)

Les problématiques liées au développement durable modifient fortement les habitudes des consommateurs ainsi que les stratégies des entreprises. Dans ce contexte, l optimisation de la chaîne logistique avec prise en compte de critères de développement durable devient un défi majeur. Néanmoins, les travaux scientifiques basés sur des modèles quantitatifs sont encore rares. Nous contribuons donc à cette littérature en revisitant des modèles classiques d optimisation de gestion de stock en prenant en compte des critères de développement durable. Nous sommes convaincus que les différents aspects du développement durable ne devraient pas être réduits à un seul objectif. Nous proposons donc une approche basée sur l optimisation multi-objectif pour revisiter les modèles economic order quantity en mono- et multi-échelon. Ces modèles sont ensuite utilisés pour analyser les impacts de la coopération client-fournisseur ou de l investissement dans des technologies vertes sur les performances de la chaîne logistique. Par ailleurs, les entreprises deviennent de plus en plus proactives vis-à-vis du développement durable. Nous proposons donc d utiliser des méthodes d aide multicritère à la décision au lieu de considérer le développement durable comme une contrainte dans les modèles. Dans cette optique, l entreprise peut fournir des informations sur les compromis désirables entre les dimensions économiques, environnementales et sociales du développement durable afin d obtenir rapidement une solution satisfaisante.Sustainability concerns are increasingly shaping customers behavior as well as companies strategy. In this context, optimizing the supply chain with sustainability considerations is becoming a critical issue. However, work with quantitative models is still scarce. Our research contributes by revisiting classical inventory models taking sustainability concerns into account. We believe that reducing all aspects of sustainable development to a single objective is not desirable. We thus reformulate single and multi-echelon economic order quantity models as multi-objective problems. These models are then used to study several options such as buyer-supplier coordination or green technology investment. We also consider that firms are becoming increasingly proactive with respect to sustainability. We thus propose to apply multiple criteria decision aid techniques instead of considering sustainability as a constraint. In this sense, the firm may provide preference information about economic, environmental and social tradeoffs and quickly identify a satisfactory solution.CHATENAY MALABRY-Ecole centrale (920192301) / SudocSudocFranceF

Economic and environmental performance of buyer-supplier coordination

This paper aims at studying the economic and environmental performance of buyer-supplier ordering policies according to different coordination relationships. Several models illustrating different outcomes of the buyer-supplier negotiation are proposed. Among them, a new model of a supplier leader supply chain is introduced and discussed. The impact of buyer-supplier coordination on the supply chain environmental performance is challenged in this paper. It is namely shown that the total supply chain carbon emissions may be greater when buyer and supplier ordering policies are fully coordinated. The setting of a carbon price may also lead to similar outcome