Zobrazeno 1 - 10
of 476
pro vyhledávání: '"Paul Zipkin"'
Publikováno v:
SSRN Electronic Journal.
We study an inventory system with multiple supply sources and expediting options. The replenishment lead times from each supply source are stochastic, representing congestion and disruption. We construct a family of smart ordering and expediting poli
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ada71867e1b4d25342cd16f71efa2e2
https://doi.org/10.2139/ssrn.3702068
https://doi.org/10.2139/ssrn.3702068
Publikováno v:
Operations Research. 65:379-395
We consider a single-product, two-source inventory system with Poisson demand and backlogging. Inventory can be replenished through a normal supply source, which consists of a two-stage tandem queue with exponential production time at each stage. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::58ef24faaf776461bae56aa61b096f87
https://doi.org/10.1287/opre.2016.1557
https://doi.org/10.1287/opre.2016.1557
Autor:
Paul Zipkin
Publikováno v:
Operations Research Letters. 44:136-142
Assemble-to-order systems are important in practice but challenging computationally. This paper combines some notions from combinatorial optimization, namely polymatroids and discrete convexity, to ease the computational burden significantly, for cer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b69cb02ee86b13286519276ea5a22852
https://doi.org/10.1016/j.orl.2015.12.010
https://doi.org/10.1016/j.orl.2015.12.010
Autor:
Paul Zipkin, Jing-Sheng Song
Publikováno v:
Manufacturing & Service Operations Management. 15:444-457
A supply stream is a continuous version of a supply chain. It is like a series inventory system, but stock can be held at any point along a continuum, not just at discrete stages. We assume stationary parameters and aim to minimize the long-run avera
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::30326792c72188ff77f9f74bf6bfd9e7
https://doi.org/10.1287/msom.2013.0431
https://doi.org/10.1287/msom.2013.0431
Publikováno v:
SSRN Electronic Journal.
We consider a single-product, two-source inventory system with Poisson demand and backlogging. Inventory can be replenished through a normal supply source, which consists of a two-stage tandem queue with exponential production time at each stage. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b76441e13ae72b4951305e4f1c6293c
https://doi.org/10.2139/ssrn.2769658
https://doi.org/10.2139/ssrn.2769658
Autor:
Paul Zipkin
Publikováno v:
Annals of Operations Research. 241:201-224
This paper studies the large-t behavior of the boundary generated by the method of images for the first-passage-time problem. We show that this behavior is characterized by certain properties of the Laplace transform of the input measure. Such proper
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cfc49cb3c0d335cbb2f37ff7882d62e7
https://doi.org/10.1007/s10479-012-1295-y
https://doi.org/10.1007/s10479-012-1295-y
Autor:
Paul Zipkin
Publikováno v:
Annals of Operations Research. 208:227-243
The inverse method of images is a relatively easy way to find approximate solutions to first-passage time problems. We extend the method in several ways: We use a linear program instead of a system of linear equations; we utilize asymptotic informati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f6efe5082739f3fd14a3c9e9e32b7a0b
https://doi.org/10.1007/s10479-012-1249-4
https://doi.org/10.1007/s10479-012-1249-4
Autor:
Paul Zipkin
Publikováno v:
J. Appl. Probab. 48, no. 3 (2011), 713-722
Durbin (1992) derived a convergent series for the density of the first passage time of a Weiner process to a curved boundary. We show that the successive partial sums of this series can be expressed as the iterates of the standard substitution method
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9951c9fc467865ba141bf6ce5d416872
https://doi.org/10.1239/jap/1316796909
https://doi.org/10.1239/jap/1316796909
Autor:
Jing-Sheng Song, Paul Zipkin
Publikováno v:
Adv. in Appl. Probab. 43, no. 1 (2011), 264-275
We propose an approximation for the inverse first passage time problem. It is similar in spirit and method to the tangent approximation for the original first passage time problem. We provide evidence that the technique is quite accurate in many case
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7234f346ac715b33c919aa01b152159b
https://doi.org/10.1239/aap/1300198522
https://doi.org/10.1239/aap/1300198522
Autor:
Tetsuo Iida, Paul Zipkin
Publikováno v:
Operations Research. 58:1350-1363
We consider a serial supply chain with one supplier and one retailer. Each obtains some demand forecast information, which may be shared or not. We investigate the members' benefits from sharing information. The forecasts follow a variant of the Mart
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::70c9ff3b711c9f1cf788bda5bd0cc296
https://doi.org/10.1287/opre.1100.0809
https://doi.org/10.1287/opre.1100.0809