• On The Moments For Ergodic Distribution Of An Inventory Model Of Type (S, S) With Regularly Varying Demands Having Infinite Variance 

  Kamislik, A. Bektas; Kesemen, T.; Khaniyev, Tahir (Turkic World Mathematical Soc, 2018)

  In this study a stochastic process X(t) which represents a semi Markovian inventory model of type (s,S) has been considered in the presence of regularly varying tailed demand quantities. The main purpose of the current ...
• The Class of L boolean AND D and Its Application to Renewal Reward Process 

  Kamislik, Ash Bektas; Kesemen, Tulay; Khaniyev, Tahir (Amer Inst Physics, 2018)

  The class of L boolean AND D is generated by intersection of two important subclasses of heavy tailed distributions: The long tailed distributions and dominated varying distributions. This class itself is also an important ...
• On The Boundary Functional Of The Random Walk With Two Barriers Related To Optimal Capacity Of The Buffer Stock 

  Hanalioglu, Z.; Gever, B.; Poladova, A.; Khaniyev, Tahir (Baku State Univ, Inst Applied Mathematics, 2018)

  In this study, a boundary functional (N) of the semi-Markovian random walk (X (t)) with two special barriers is considered. The boundary functional N is defined as the first time when the random walk exits from the interval ...
• A mobile asset sharing policy for hospitals with real time locating systems 

  Demircan-Yildiz, Ece Arzu; Fescioğlu Ünver, Nilgün (IOS Press, 2016)

  BACKGROUND: Each year, hospitals lose a considerable amount of time and money due to misplaced mobile assets. In addition the assets which remain in departments that frequently use them depreciate early, while other assets ...
• Heuristic policies for mobile asset sharing within hospitals 

  Ersol, Duygu; Fescioğlu Ünver, Nilgün (Pergamon-Elsevier Science Ltd, 2017)

  Hospitals that share their mobile assets among departments can use real time locating systems (RTLS) to track the assets. Caregivers use RTLS to locate the closest assets and request these assets from those departments. ...
• Lane covering with partner bounds in collaborative truckload transportation procurement 

  Kuyzu, Gültekin (Pergamon-Elsevier Science Ltd, 2017-01)

  In collaborative truckload transportation procurement, the collaborating shippers aim to jointly identify and submit tours with little or no asset repositioning to a carrier, as opposed to submitting individual lanes, in ...
• Managing transshipments in a multi-retailer system with approximate policies 

  Comez-Dolgan, Nagihan; Fescioğlu Ünver, Nilgün (Palgrave Macmillan Ltd, 2015)

  Using the right transshipment policy is important when transshipments are exercised under demand uncertainty. Optimal transshipment policy can be quite complex in a multi-firm system as optimal actions depend on all system ...
• Asymptotic Results for an Inventory Model of Type (s, S) with Asymmetric Triangular Distributed Interference of Chance and Delay 

  Hanalioglu, Zulfiye; Khaniyev, Tahir (Gazi Univ, 2018)

  In this study, a semi - Markovian inventory model of type (s, S) is considered and the model is expressed by a modification of a renewal - reward process (X(t)) with an asymmetric triangular distributed interference of ...
• Asymptotic Expansions For The Moments Of The Renewal-Reward Process With A Normal Distributed Interference Of Chance 

  Hanalioglu, Z.; Unver, N. Fescioglu; Khaniyev, Tahir (Ministry Communications & High Technologies Republic Azerbaijan, 2018)

  In this study, a renewal-reward process with a normal distributed interference of chance is mathematically constructed. The ergodicity of this process is discussed. The exact formulas for the nth order moments of the ergodic ...
• Bid price optimization for truckload carriers in simultaneous transportation procurement auctions 

  Kuyzu, Gültekin; Akyol, Cagla Gul; Ergun, Ozlem; Savelsbergh, Martin (Pergamon-Elsevier Science Ltd, 2015-03)

  We study simultaneous transportation procurement auctions from a truckload carrier's perspective. We formulate a stochastic bid price optimization model aimed at maximizing the carrier's expected profit. The model accounts ...
• RFID in production and service systems: Technology, applications and issues 

  Fescioğlu Ünver, Nilgün; Choi, Sung Hee; Sheen, Dongmok; Kumara, Soundar (Springer, 2015)

  Radio Frequency Identification (RFID) is a technology used for identification of objects and information transfer from a distance though radio waves. Different types of RFID tags are used for different applications. ...
• Pure cycles in two-machine dual-gripper robotic cells 

  Gültekin, Hakan; Dalgic, Ozden O.; Akturk, M. Selim (Pergamon-Elsevier Science Ltd, 2017-12)

  We consider a robotic cell served by a dual-gripper robot that consists of identical CNC machines placed linearly and a material handling robot loading/unloading the machines and transporting the parts between them. Identical ...
• A production scheduling model and analysis for the maintenance repair and overhaul service providers 

  Ertoğral, Kadir; Erkoc, Murat; Ulker, Dogukan Hazar (Gazi Univ, Fac Engineering Architecture, 2015)

  Maintenance, repair and overhaul (MRO) are regulated and necessary activities for the airline sector to ensure the safety and continuity of flights. Both military and commercial aircrafts must go through MRO at regulated ...
• Cyclic Delivery Schedules for an Inventory Routing Problem 

  Ekici, Ali; Ozener, Okan Orsan; Kuyzu, Gültekin (Informs, 2015-11)

  We consider an inventory routing problem where a common vendor is responsible for replenishing the inventories of several customers over a perpetual time horizon. The objective of the vendor is to minimize the total cost ...
• Comparative Analysis of Load-Shaping-Based Privacy Preservation Strategies in a Smart Grid 

  Kement, Cihan Emre; Gültekin, Hakan; Tavlı, Bülent; Girici, Tolga; Uludag, Suleyman (IEEE-Inst Electrical Electronics Engineers Inc, 2017-12)

  A key enabler for the smart grid is the fine-grained monitoring of power utilization. Although such a mechanism is helpful in the optimization of the whole electricity generation, distribution, and consumption cycle, it ...
• Asymptotic approach for a renewal-reward process with a general interference of chance 

  Aliyev, Rovshan; Ardic, Ozlem; Khaniyev, Tahir (Taylor & Francis Inc, 2016)

  In this study, a renewal-reward process with a discrete interference of chance is constructed and considered. Under weak conditions, the ergodicity of the process X(t) is proved and exact formulas for the ergodic distribution ...
• Investigation of fuzzy inventory model of type (s, S) with Nakagami distributed demands 

  Turksen, I. Burhan; Khaniyev, Tahir; Gokpinar, Fikri (IOS Press, 2015)

  In this study, a fuzzy inventory model of type (s, S) is considered under Nakagami distribution of demands. We first obtain the membership function of the fuzzy renewal function when the amount of demand has Nakagami ...
• On the Stationary Distribution for a Fuzzy Inventory Model of Type (s,S) with Inverse Gaussian Distributed Demands 

  Khaniyev, Tahir; Gokpinar, Fikri; Hanalioglu, Tagi; Turksen, I. Burhan (Springer International Publishing Ag, 2018-12)

  In this study, we consider a fuzzy inventory model of type (s,S) with random demands having an inverse Gaussian distribution. We first show the monotonicity of the renewal function with respect to mean parameter. Thus we ...
• On the Moments of a Semi-Markovian Random Walk with Gaussian Distribution of Summands 

  Aliyev, Rovshan; Khaniyev, Tahir (Taylor & Francis Inc, 2014-01)

  In this article, a semi-Markovian random walk with delay and a discrete interference of chance (X(t)) is considered. It is assumed that the random variables (n), n=1, 2,..., which describe the discrete interference of ...
• Asymptotic Properties of the Straight Line Estimator for a Renewal Function 

  Gokpinar, Esra; Khaniyev, Tahir; Gamgam, Hamza (Univ Kebangsaan Malaysia, 2015-07)

  In estimation problems in renewal function, when the distribution is not known, nonparametric estimators of renewal function are used. Frees (1986a, Warranty analysis and renewal function estimation, Naval Res. Logist. ...

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