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Modelling an industrial strategy for inventory management in supply chains: the ‘Consignment Stock’ case
, 2003
"... ... industrial practice observed in the automotive manufacturing context and defined as ‘Consignment Stock’ (CS). To understand the potentiality of CS policy, an analytical modelling is offered that refers to the problem of a single-vendor and single-buyer productive situation. A comparison with the ..."
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... industrial practice observed in the automotive manufacturing context and defined as ‘Consignment Stock’ (CS). To understand the potentiality of CS policy, an analytical modelling is offered that refers to the problem of a single-vendor and single-buyer productive situation. A comparison with the optimal solution avail-able in the literature is also shown. The conclusion proposes a method that is useful in identifying those productive situations where CS might be implemented successfully. Results show how CS policy might be a strategic and profitable approach to stock management in uncertain environments, i.e. where delivery lead times or market demand vary over time.
OPTIMAL POLICY FOR A SIMPLE SUPPLY CHAIN SYSTEM WITH DEFECTIVE ITEMS AND RETURNED COST UNDER SCREENING ERRORS
, 2008
"... Abstract Recently, one of the most interesting topics in supply chain management (SCM) is the integrated vendor-buyer production-inventory problem, in which the critical issue is to determine economic lot size per shipment and deliveries. Most researches on this issue assume that products are screen ..."
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Abstract Recently, one of the most interesting topics in supply chain management (SCM) is the integrated vendor-buyer production-inventory problem, in which the critical issue is to determine economic lot size per shipment and deliveries. Most researches on this issue assume that products are screened and the process is perfect; however, screening errors (including type-I and type-II) may occur with imperfect quality in practice. In this paper we consider a simple single-vendor single-buyer supply chain system in which products are received with defective quality, and 100 % screening process is performed with possible inspection errors. The objective of this paper is to determine the optimal number of shipments as well as the size of each shipment in order to minimize the joint annual cost incurred by both vendor and buyer. We develop a cost model for the supply chain system and propose a solution procedure to find the optimal solution. A numerical example is given to illustrate the application of the model. Besides, based on the numerical example, a sensitivity analysis is also made to investigate the effects of five important parameters (the inspection rate, the annual demand, the defective rate, Type I error, and Type II error) on the optimal solution.
Multi-item single-vendor-single-buyer problem with . . .
"... This paper deals with the problem of shipping multiple commodities from a single vendor to a single buyer. Each commodity is assumed to be constantly consumed at the buyer, and periodically replenished from the vendor. Furthermore, these replenishments are restricted to happen at discrete time insta ..."
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This paper deals with the problem of shipping multiple commodities from a single vendor to a single buyer. Each commodity is assumed to be constantly consumed at the buyer, and periodically replenished from the vendor. Furthermore, these replenishments are restricted to happen at discrete time instants, e.g., a certain time of the day or a certain day of the week. At any such time instant, transportation cost depends on the shipment quantity according to certain discount scheme. Specifically, we consider two transportation quantity discount schemes: LTL (less-than-truckload) incremental discount and TL (truckload) discount. For each case, we develop MIP (mixed integer programming) mathematical model whose objective is to make an integrated replenishment and transportation decision such that the total system cost is minimized. We also derive optimal solution properties and give numerical studies to investigate the problem.
A Single Manufacturer -A Single Buyer Partnership with Vendor Managed Inventory and Consignment
"... Abstract Due to global competitiveness, a single manufacturer and a single buyer agree to work together to jointly optimize their performance. The aim of this paper is to propose two integration inventory approaches in order to reduce the total inventory costs: Vendor Managed Inventory (VMI) and Co ..."
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Abstract Due to global competitiveness, a single manufacturer and a single buyer agree to work together to jointly optimize their performance. The aim of this paper is to propose two integration inventory approaches in order to reduce the total inventory costs: Vendor Managed Inventory (VMI) and Consignment. VMI is an integration tool where manufacturer is authorized to manage the buyer's inventory level. In consignment, manufacturer receives the payment only after the buyer discharges the product from the storage to be used in the production. In this case, the total inventory cost involves transportation cost that charged to the manufacturer. Algorithms are developed to obtain the optimal strategy. Analysis solution to the ratio of the manufacturer's transportation cost to the buyer's ordering cost indicates that the conformance partnership with VMI and consignment is determined by the value of the parameters used. If the manufacturer's transportation cost lower than the buyer's ordering cost, then use VMI, since it is not feasible to continue the partnership with the consignment. Conversely, if the manufacturer's transportation cost is much higher than the buyer's ordering cost, then the partnership is appropriate to proceed to the consignment. Numerical examples are given to illustrate the results.
Modified Controllable Lead Time Model with Stochastic Demand and Batch Shipment Policy
"... This study investigates the single-vendor single-buyer integrated production inventory models with controllable lead time. The lead time demand is stochastic and shortage during the lead time is permitted. The buyer orders a lot of size Q and the vendor manufactures mQ with a finite production rate ..."
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This study investigates the single-vendor single-buyer integrated production inventory models with controllable lead time. The lead time demand is stochastic and shortage during the lead time is permitted. The buyer orders a lot of size Q and the vendor manufactures mQ with a finite production rate P at one set-up but ships in quantity Q to the buyer over m times. Most researchers do not take this assumption into account while determining the crashing cost. In this study, a modified model is proposed under the practical fact that the production is continuous during a production cycle in which the crashing set-up cost is charged only once. Numerical examples are presented to illustrate the procedures and results of the proposed algorithm. The modified model is shown to provide lower total costs and shorter lead time.
Supply Chain Management in Humanitarian Aid and Disaster Relief
, 2013
"... Humanitarian aid and disaster relief are delivered in times of crises or disasters, such as after a conflict or in response to a tsunami. Different from regular aid programs of a country, they are sent to fix local areas and repatriate refugees in pace with sudden events instead of dealing with syst ..."
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Humanitarian aid and disaster relief are delivered in times of crises or disasters, such as after a conflict or in response to a tsunami. Different from regular aid programs of a country, they are sent to fix local areas and repatriate refugees in pace with sudden events instead of dealing with systemic problems of global poverty or inequality. There is evidence that a growing number of natural and man-made disasters happen all around the world, affecting hundreds of millions of people every year. In spite of this fact, only in these years starting from 2005 has supply chain management for humanitarian aid and disaster relief been a topic of interest for researchers. Consequently, the academic literature in this field is comparatively new and still sparing, indicating a requirement for more academic studies in this field. The purpose of this proposal is to develop a conceptual framework for supply chain management in humanitarian aid and disaster relief. In particular, the focus includes two specific aspects during preparedness phase: inventory prepositioning and transportation planning. In addition, the research proposes and analyzes how to put an effective supply
IN THE NAME OF ALLAH, MOST MERCIFUL, MOST GRACIOUS
"... Research and development to serve the industry and upgrade its services ..."
