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A New Inventory Control Policy for a Two-level Supply Chain with Perishable Products

Mahmoodi, Anwar | 2014

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 46935 (01)
  4. University: Sharif University of Technology
  5. Department: Industrial Engineering
  6. Advisor(s): Hajji, Alireza; Hajji, Rasoul
  7. Abstract:
  8. The assumption of infinite lifetime is common in most of the inventory models. However, the perishability of products is a major problem of some industry sectors in which by disregarding the finite lifetime of their products the resulting model may give inaccurate results. Although, significant studies have been carried out for inventory control of perishable products, yet the literature needs more studies to develop or optimize the inventory policies. In this thesis, the inventory control of perishable products is considered. For the case of stochastic demand, it was well known that there is no inventory control policy in which both the order size and the order interval are constant with an optimal solution. Recently, a new ordering policy named (1, T), have been developed for nonperishable products in which the time interval between two consecutive orders and the value of the order size are both constant. Developing the (1, T) policy for perishable products is the main direction of this research. The considered inventory model is investigated using its analogy with a queueing model with impatient customers. It is observed that the total cost rate is independent from the lead time as is for nonperishable products. Furthermore, the numerical analysis shows that for fixed values of system parameters, there is a fixed value of lead time for which the performance of (1, T) policy is better than (S–1, S) policy. Further as the lead time increases this superiority is more pronounced. Beyond its cost effectiveness, the (1, T) policy enjoys a lot of advantages thanks to its natural characteristic of elimination the uncertainty of demands for the upstream locations of a supply chain. One of which is the elimination of bullwhip effect
  9. Keywords:
  10. Inventory Control ; Perishable Products ; Two-Stage Supply Chain ; (1,T)Policy ; Queueing System with Impatient Customers ; Two-level Inventory System

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