A new mathematical modeling and a genetic algorithm search for milk run problem (an auto industry supply chain case study)

Sadjadi, Seyed Jafar; Jafari, Mostafa; Amini, T.

doi:10.1007/s00170-008-1648-5

Cited by 60 publications

(28 citation statements)

References 15 publications

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“…Many studies on milk-run supply systems consider the work as a scheduling, capacity or vehicle routing problem. Sadjadi et al [23] developed a mixed integer mathematical model with a genetic algorithm for finding the optimal solution to all three problems mentioned above. Emde and Boysen [10] introduced a precise solution procedure based on nested dynamic programming of joint tow train routing and scheduling, together with a trade-off study between the number and capacity of the tow trains and the in-process inventory near the line.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Thanks to the milk-run, logistics performance is improved by effective usage of the transport vehicles, reduction of inventories and their maintenance costs, increases in delivery on-time, reductions of stock out at assembly lines, increased capital turnover and it establishes a good discipline in logistic operations (basis for standardization) [23].…”

Section: Introductionmentioning

confidence: 99%

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Simulation-based efficiency analysis of an in-plant milk-run operator under disturbances

Korytkowski

Karkoszka

2015

Int J Adv Manuf Technol

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This study examines the efficiency, interactions and impact of a milk-run operator on a typical assembly line. The idea behind the milk-run lies in organizing the material supply to production areas using a specialized logistic worker travelling in cycles between the warehouse and production. A discrete-event simulation model was developed to evaluate the interactions of the milk-run operator and a typical 10 workstation assembly line. We present an analysis of the various kinds of disturbances occurring in the production environment (time variability of technological operations and supply cycle, delays of supply cycles) and management decisions (takt time presence or absence, buffer capacity, supply cycle duration) on the production stability and performance (assembly line throughput rate, milk-run operator utilization, workstation starvation and work in process). Recommendations for designers of in-plant logistics are provided.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation-based efficiency analysis of an in-plant milk-run operator under disturbances

Korytkowski

Karkoszka

2015

Int J Adv Manuf Technol

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“…According Li, Wu, Lai, & Liu, (2008) direct shipment method is a delivery method that is practiced in a company in which the supplier provides a vehicle used per period of time to one customer or a retailer. Another definition explained by Sadjadi, Jafari, & Amini (2009), direct shipment is a direct delivery from a supplier to its customer. In other words, direct shipment is a delivery system done directly from a supplier to a customer by using a vehicle to serve one specific customer.…”

Section: Introductionmentioning

confidence: 99%

“…According to Sadjadi et al, (2009) direct shipment method is where the consignments are directly delivered to the manufacturers from the suppliers, and the company is responsible for storing the general inventory. This logistic pattern is traditionally used for supplying all parts.…”

Section: Introductionmentioning

confidence: 99%

“…A company that is able to cut down the delivery route and lessen the number ofvehicles used would be able to increase its added value.In accordance with a research done by Endarwati, Mahmudy, & Ratnawati (2014), to shorten delivery process time, companies should choose the most optimal routes. By applying the milk run method, it is expected to reduce the costs during delivery process, reduce the use of warehouse space, and improve the supply chain performance or logistic as a consequence of the effective transport process (Sadjadi et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

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Optimizing Delivery Route by Applying Milkrun Method

Setiani

Fiddieny

Setiawan

et al. 2018

Proceedings of the Conference on Global Research on Sustainable Transport (GROST 2017)

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Efficiency of the optimal vehicle route to generate effective delivery is an important issue in the logistics world. The common methods usually practiced in delivery systems are direct shipment, indirect shipment and milk run method. The objective of this research is to analyze the optimization of delivery route by comparing direct shipment method to milk run method to obtain effective delivery. This research involved 8 suppliers and 1 delivery route from the total population of 18 suppliers at PT. Toyota Motor Manfacturing Indonesia and 4 delivery routes in Cikarang area. Data were analyzed by using Vehicle Routing Problem and saving matrix method. The result shows that the optimal delivery route can minimize the distance and vehicle leadtime, therefore, the total cost spent in the milkrun delivery process is cheaper than by applying direct shipment method. It can be concluded that regular parts shipment process by using milk run method is more effective than by using direct shipment method.

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