Now showing items 1-8 of 8

    • The effect of economies-of-scale on the performance of lot-sizing heuristics in rolling horizon basis 

      Kian, R.; Berk, Emre; Gürler, Ülkü; Rezazadeh, H.; Yazdani, B. (Taylor and Francis, 2021)
      In this article, we consider the production planning problem in the presence of (dis)economies-of-scale in production costs on a rolling horizon basis with a fixed forecast horizon. We propose variants of three well-known ...
    • An integrated replenishment and transportation model: Computational performance assessment 

      Kian, R.; Berk, Emre; Gürler, Ülkü (CRC Press, 2014)
    • Inventory theory 

      Gürler, Ülkü; Berk, Emre (Taylor & Francis, 2016)
      Inventory theory is concerned with management of the quantity and timing of the replenishment of assets typically stored to satisfy future demands. In this chapter, we introduce the fundamentals of inventory theory and the ...
    • Minimal conic quadratic reformulations and an optimization model 

      Kian, R.; Berk, Emre; Gürler, Ülkü (Elsevier, 2019)
      In this paper, we consider a particular form of inequalities which involves product of multiple variables with rational exponents. These inequalities can equivalently be represented by a number of conic quadratic forms ...
    • Newsboy inventory problem 

      Gürler, Ülkü; Berk, Emre (John Wiley & Sons, 2006)
      A definition and classical formulation of the newsboy inventory model as a profit maximization problem is provided. The structure of the optimal stocking policy is given. Alternative formulations of mean-variance, down-side ...
    • Newsboy inventory problem [reprint] 

      Gürler, Ülkü; Berk, Emre (John Wiley & Sons, 2010)
      A definition and classical formulation of the newsboy inventory model as a profit maximization problem is provided. The structure of the optimal stocking policy is given. Alternative formulations of mean-variance, down-side ...
    • On the (Q,r) policy for perishables with positive lead times and multiple outstanding orders 

      Berk, Emre; Gürler, Ülkü; Poormoaied, Saeed (Springer New York LLC, 2020-01)
      We consider an inventory system for perishables with fixed lifetimes, positive replenishment lead times and lost sales in the presence of non-negligible fixed ordering costs. The system is studied under the lotsize reorder ...
    • Queueing theory 

      Gürler, Ülkü; Berk, Emre (CRC Press, 2016)
      Queueing theory is concerned with the quantitative modeling of dynamic systems that generate waiting lines, and the analysis of the behavior of such systems in the short and long time spans. In this chapter, we present a ...