Joint inventory/replacement policies

 
 
 
 

Joint inventory/replacement policies

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dc.contributor.advisor Ritchken, Peter en_US
dc.contributor.author Aka, Mian en_US
dc.date.accessioned 2008-07-10T14:25:39Z
dc.date.available 2008-07-10T14:25:39Z
dc.date.created 1993 en_US
dc.date.issued 2008-07-10T14:25:39Z
dc.identifier.uri http://rave.ohiolink.edu/etdc/view?acc_num=case1057092535 en_US
dc.identifier.uri http://hdl.handle.net/2374.OX/16369
dc.description Most replacement models assume that whenever a replacement is needed a spare is immediately available. This assumption implies that lead times are zero or that an inventory is maintained. Typically, the associated costs of managing inventory are ignored. This dissertation explores joint inventory replacement policies for a single unit and for multiple units operating in parallel. Such policies are particularly important when reorder lead times are significant and downtime costs large. Models within this field vary according to cost structures, stochastic processes generating failures, types of failures, permissible preventive actions and objective functions. In addition the status of the system may or may not be continually observable, and information on the failure parameters may or may not be known with certainty. In this work all our models have a common thread. First, the status of all units is continually updated and exact times to failure distributions are known. Second, information regarding the parameters of the failure distributions are known. Third, all units operate independently of each other. Fourth, the objective function in all cases is to minimize the long run average cost per unit of time. Three types of joint inventory/replacement policies are considered. The first two policies are concerned with managing a single operating unit. I n the first policy, an order is placed at a predetermined time s or when the unit fails whichever comes first. A preventive replacement is performed at time T. Failed units are of course replaced as soon as possible. The second policy permits more than one unit of inventory to be held. In particular when the inventory level falls to k, an order of size q units is placed. The third policy is concerned with managing n units working in parallel. To obtain tractable results, however, failure rates are assumed to be constant. en_US
dc.format application/pdf en_US
dc.format 113p. en_US
dc.rights unrestricted en_US
dc.rights Copyright and permissions information available at the source archive en_US
dc.subject Joint inventory/replacement policies en_US
dc.title Joint inventory/replacement policies en_US
dc.type Electronic Thesis or Dissertation en_US
dc.degree.name PhD en_US
dc.degree.level doctoral en_US
dc.degree.discipline Operations Research en_US
dc.degree.grantor Case Western Reserve University en_US
dc.contributor.publisher Case Western Reserve University / OhioLINK en_US

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