Get Analysis and Algorithms for Service Parts Supply Chains PDF

By John A. Muckstadt

ISBN-10: 0387227156

ISBN-13: 9780387227153

Prone requiring components has develop into a $1.5 trillion company each year around the world, making a super incentive to control the logistics of those components successfully via making making plans and operational judgements in a rational and rigorous demeanour. This e-book presents a large assessment of modeling methods and resolution methodologies for addressing provider elements stock difficulties present in high-powered expertise and aerospace purposes. the point of interest during this paintings is at the administration of excessive expense, low call for fee carrier components present in multi-echelon settings.This detailed e-book, with its breadth of themes and mathematical therapy, starts off through first demonstrating the optimality of an order-up-to coverage [or (s-1,s)] in convinced environments. This coverage is utilized in the true international and studied through the textual content. the elemental mathematical development blocks for modeling and fixing functions of stochastic method and optimization options to carrier elements administration difficulties are summarized widely. quite a lot of specific and approximate mathematical types of multi-echelon platforms is built and utilized in perform to estimate destiny stock funding and half fix requirements.The textual content can be utilized in quite a few classes for first-year graduate scholars or senior undergraduates, in addition to for practitioners, requiring just a history in stochastic techniques and optimization. it is going to function a superb reference for key mathematical suggestions and a advisor to modeling various multi-echelon provider elements making plans and operational difficulties.

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Let t +t (y) be the arrival time of this customer. That is, t (y) is the length of time for y − 1 arrivals to take place. Given that the arrival process is Poisson, t (y) is gamma distributed with parameters (y − 1, 1/λ). Therefore, µ(y) can be calculated as µ(y) = E t (y) h · (t (y) − L)+ + b · (L − t (y))+ . Since monotone policies are optimal, it has to be true that if it is optimal to release a unit when the corresponding customer is at a distance y, then it would be optimal 34 2 Background: Analysis of (s–1, s) and Order-Up-To Policies to release the unit if the customer were at distance y − 1.

Resupply lead times are assumed to be constant and known. We show the optimality of the order-up-to policy in this case using a classical dynamic programming approach following a proof by Karlin and Scarf [147]. We next show the optimality of the (s–1,s) policy for managing a single item in both single location and serial systems. Again, ordering decisions are made periodically. Demand in each period is described by a discrete random variable and is independent from period to period. Resupply lead times are assumed to be random variables with the property that lead times of successive orders do not cross.

Muharremoglu and Tsitsiklis [184] present the analysis of the infinite horizon problem. In the next two sections, we will discuss how this approach can be extended to more general situations. 2 Stochastic Lead Times So far, we have assumed that the lead time is exactly m − 1 periods. Let us now relax this assumption by allowing stochastic lead times subject to the restriction that orders can not cross, that is, the sequence in which orders are received from 30 2 Background: Analysis of (s–1, s) and Order-Up-To Policies the supplier corresponds to the sequence in which orders were placed on the supplier.

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Analysis and Algorithms for Service Parts Supply Chains by John A. Muckstadt


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