• 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 ...
• 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. ...
• 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 ...
• 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 ...
• 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 ...
• 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 ...
• 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 ...
• 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 ...
• 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 ...
• 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 ...
• On The Application Of Random Walk With Delay And Pareto Distributed Interference Of Chance To An Insurance Model 

  Kesemen, Tulay; Kucuk, Zafer; Khaniyev, Tahir; Yetim, Fuat; Bektas Kamislik, Ash (Gazi Univ, 2016)

  In this study, a semi-Markovian random walk with Pareto distributed interference of chance and delay is considered. Some exact formulas for the first four stationary moments of the process are obtained when the random ...
• Three-term asymptotic expansion: A semi-Markovian random walk with a generalized beta distributed interference of chance 

  Kesemen, Tuelay; Kucuk, Zafer; Khaniyev, Tahir; Ocal, Cisem (Taylor & Francis Inc, 2017)

  A semi-Markovian random walk process (X(t)) with a generalized beta distribution of chance is considered. The asymptotic expansions for the first four moments of the ergodic distribution of the process are obtained as ...
• Asymptotic Rate for Weak Convergence of the Distribution of Renewal-Reward Process with a Generalized Reflecting Barrier 

  Khaniyev, Tahir; Gever, Basak; Hanalioglu, Zulfiye (Springer-Verlag Berlin, 2016)

  In this study, a renewal-reward process (X(t)) with a generalized reflecting barrier is constructed mathematically and under some weak conditions, the ergodicity of the process is proved. The explicit form of the ergodic ...
• Modelling and analysis of a strategic fleet sizing problem for a furniture distributor 

  Ertoğral, Kadir; Akbalik, Ayse; Gonzalez, Silvia (Inderscience Enterprises Ltd, 2017)

  We address a real strategic fleet sizing problem for a furniture and home accessory distributor. The current practice in the real case is to keep the inventory of items in self-owned branch showrooms. The distributor plans ...
• Overhaul planning and exchange scheduling for maintenance services with rotable inventory and limited processing capacity 

  Erkoc, Murat; Ertoğral, Kadir (Pergamon-Elsevier Science Ltd, 2016-08)

  Maintenance, repair and overhauling (MRO) of high cost equipment used in many industries are typically subject to regulations set by local governments or international agencies. For example in the aviation industry, critical ...

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