Title:
Periodic-review policies for a system with emergency orders

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dc.contributor.advisor Alexopoulos, Christos
dc.contributor.advisor Ferguson, Mark E.
dc.contributor.author Hederra, Francisco Javier en_US
dc.contributor.committeeMember Goldsman, David
dc.contributor.committeeMember Ayhan, Hayriye
dc.contributor.committeeMember Griffin, Paul
dc.contributor.department Industrial and Systems Engineering en_US
dc.date.accessioned 2009-01-22T15:57:35Z
dc.date.available 2009-01-22T15:57:35Z
dc.date.issued 2008-09-25 en_US
dc.description.abstract We study an inventory system with two potential supply modes: regular order placement opportunities happen at a fixed frequency, which defines regular review cycles, while emergency orders can be placed on every period within a regular review cycle. Regular and emergency orders incur a per-unit cost while the latest incurs an additional setup cost For a regular order lead-time equal to two periods, we show that the optimal policy with respect to the expected total discounted cost, is of (s; S) type for emergency orders while the size of a regular order depends on the inventory position following a potential emergency order. Although we could not establish the optimality for regular order lead-times exceeding two periods, substantial experimental evidence supports the conjecture that the optimal policy retains the same structure. Since the optimal policy algorithm requires significant computational effort, we develop and evaluate two heuristic policies whose operational parameters can be computed with relatively small computational effort and compare them against the optimal policy in terms of implementation difficulty, speed and accuracy for an experimental design of 3888 cases. The evaluation of the proposed optimal policy and the two heuristics requires a simulation suite flexible enough to capture the specific problem dynamics. This motivates the development of the Inventory Simulator Workbench (ISW). This inventory system simulator, written in Java, provides the user with a graphical interface and the ability to model a large range of supply chain structures and inventory ordering and distribution policies. en_US
dc.description.degree Ph.D. en_US
dc.identifier.uri http://hdl.handle.net/1853/26694
dc.publisher Georgia Institute of Technology en_US
dc.subject Emergency orders en_US
dc.subject Periodic review en_US
dc.subject Inventory en_US
dc.subject.lcsh Industrial procurement
dc.subject.lcsh Inventory control
dc.subject.lcsh Mathematical optimization
dc.subject.lcsh Computer simulation
dc.title Periodic-review policies for a system with emergency orders en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Alexopoulos, Christos
local.contributor.corporatename H. Milton Stewart School of Industrial and Systems Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication b7ba3840-1382-4f6a-9338-d3e40945fc2a
relation.isOrgUnitOfPublication 29ad75f0-242d-49a7-9b3d-0ac88893323c
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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