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Yaşar Yasemin Serin

E-mail
serin@metu.edu.tr
Department
Department of Industrial Engineering
A new approximate evaluation method for two-echelon inventory systems with emergency shipments
Oezkan, Erhun; VAN HOUTUM, Geert-Jan; Serin, Yaşar Yasemin (Springer Science and Business Media LLC, 2015-01-01)
We consider the inventory control of repairable spare parts in a network consisting of a central warehouse, a central repair facility, and multiple local warehouses. Demands for spare parts occur at the local warehouses. I...
An interactive probabilistic approach to multi-criteria sorting
BUGDACI, Asli Gul; KOKSALAN, Murat; Ozpeynirci, Selin; Serin, Yaşar Yasemin (2013-10-01)
This article addresses the problem of sorting alternatives evaluated by multiple criteria among preference-ordered classes. An interactive probabilistic sorting approach is developed in which the probability of an alternat...
Production and lead time quotation under imperfect shop floor information
KAMAN, Cumhur; Savaşaneril Tüfekci, Seçil; Serin, Yaşar Yasemin (Elsevier BV, 2013-08-01)
We study the value of shop floor information for a manufacturer that operates under a make-to-stock queue scheme and quotes lead times to arriving customers. Two settings are analyzed where in the first setting the manufac...
Pooling through lateral transshipments in service parts systems
Satir, Benhur; Savaşaneril Tüfekci, Seçil; Serin, Yaşar Yasemin (2012-07-16)
We study the inventory management problem of a service center operating in a decentralized service parts network. The service centers collaborate through inventory and service pooling, and through sharing information on th...
A geometric representation of profits in a supply chain network
Serin, Yaşar Yasemin (2012-05-01)
Economists express profits as areas representing producer's surplus or consumer's surplus corresponding to a pair of supply and demand functions. A similar representation can be employed in a supply chain network where the...
Comments on: "A policy improvement method for constrained average Markov decision processes" [Oper. Res. Lett. 35 (2007) 434-438]
Serin, Yaşar Yasemin (Elsevier BV, 2009-01-01)
Competitive newsvendor problems with the same Nash and Stackelberg solutions
Serin, Yaşar Yasemin (2007-01-01)
Consider two newsvendors: (i) they compete satisfying substitutable demands searching Nash equilibrium or (ii) one is the leader deciding first, the other responds optimally playing a Stackelberg game. The leader profits m...
Markov decision processes under observability constraints
Serin, Yaşar Yasemin; Kulkarni, V (Springer Science and Business Media LLC, 2005-06-01)
We develop an algorithm to compute optimal policies for Markov decision processes subject to constraints that result from some observability restrictions on the process. We assume that the state of the Markov process is un...
Lot splitting under learning effects with minimal revenue requirements and multiple lot types
Serin, Yaşar Yasemin; KAYALIGIL, S (2003-08-01)
The lot splitting problem in the presence of learning is addressed. This work is an extension of an approach proposed for splitting in the case of a single item. We address the issue of a minimal revenue requirement from p...
Markov decision processes with restricted observations: Finite horizon case
Serin, Yaşar Yasemin; Avşar, Zeynep Müge (Wiley, 1997-08-01)
In this article we consider a Markov decision process subject to the constraints that result from some observability restrictions. We assume that the state of the Markov process under consideration is unobservable. The sta...