Recent Submissions

  • Decomposable sums and their implications on naturally quasiconvex risk measures 

    Bilir, Barış (Bilkent University, 2020-09)
    When measuring risk in finance, it is natural to expect that risk decreases with diversification. For risk measures, convexity and quasiconvexity are the two properties which capture the concept of diversification. In ...
  • End-of-life inventory management problem: new results and insights 

    Özyörük, Emin (Bilkent University, 2020-09)
    We consider a manufacturer who controls the inventory of spare parts in the end-of-life phase and takes one of three actions at each period: (1) place an order, (2) use existing inventory, or (3) stop holding inventory ...
  • Orphan drug logistics 

    Dursunoğlu, Çağla Fatma (Bilkent University, 2020-08)
    "Orphan drugs" are medical products that are developed to treat orphan diseases. Since they are required by a small number of population, the pharmaceutical industry is not interested much in them. Hence they are produced ...
  • Optimization of last-mile deliveries with synchronous truck and drones 

    Özel, Aysu (Bilkent University, 2020-08)
    Deployment of drones in delivery operations has been attracting a growing interest from commercial sector due to its prospective advantages for the distribution systems. Motivated by the widespread adoption of drones in ...
  • Exact solution algorithms for biobjective mixed integer programming problems 

    Emre, Deniz (Bilkent University, 2020-08)
    In this thesis, objective space based exact solution algorithms for biobjective mixed integer programming problems are proposed. The algorithms solve scalarization models in order to explore predetermined regions of the ...
  • An exact algorithm for biobjective integer programming problems 

    Doğan, Saliha Ferda (Bilkent University, 2019-07)
    We propose an exact algorithm to find all nondominated points of biobjective integer programming problems, which arise in various applications of operations research. The algorithm is based on dividing objective space ...
  • A branch and cut algorithm for the inventory routing problem 

    Mahmutoğulları, Özlem (Bilkent University, 2019-07)
    The inventory routing problem arises in vendor managed systems where products are distributed from a supplier to a set of retailers by a homogeneous eet of capacitated vehicles. The routes of the vehicles and the ...
  • Airline rescheduling with aircraft unavailability period 

    Yetimoğlu, Yücel Naz (Bilkent University, 2019-07)
    Airlines design their initial schedules under the assumption that all resources will be available on time and ights will operate as planned. However, some disruptions occur due to mechanical failures and unexpected ...
  • Data analytics in stock markets 

    Salari, Hajar Novin (Bilkent University, 2019-07)
    One of the important strategies that is employed in finance is data analytics. Data Analytics is the science of investigating raw data with intention of drawing meaningful information and useful conclusions. Recently, ...
  • Lot sizing with perishable items 

    Arslan, Nazlıcan (Bilkent University, 2019-07)
    We address the uncapacitated lot sizing problem for a perishable item that has a deterministic and fixed lifetime. In the first part of the study, we assume that the demand is also deterministic. We conduct a polyhedral ...
  • Compound Poisson disorder problem with uniformly distributed disorder time 

    Ürü, Çağın (Bilkent University, 2019-07)
    Suppose that arrival rate and jump distribution of a compound Poisson process change suddenly at an unknown and unobservable time. The problem of detecting the change (disorder) as soon as it occurs is known as compound ...
  • Missed flight cover design 

    Çelik, Beyza (Bilkent University, 2019-07)
    Missed flight cover is an option with a price and validity period and is a source of ancillary revenues for the airline companies and helps passengers, who missed their flights, resume their journeys at reduced costs. ...
  • Location-location routing problem and its application on refugee camps 

    Kumcu, Gül Çulhan (Bilkent University, 2019-06)
    In the classical Location Routing Problem (LRP), the customers are at xed and known locations. Given the known customer locations, in LRP models, decisions are taken for distribution center locations and corresponding ...
  • Assortment planning under non-linear cost structures 

    Shams, Farzad (Bilkent University, 2019-04)
    We first consider the assortment optimization problem with fixed product costs under the Mixtures of Multinomials (MMNL) Model. The problem is NP-hard even under the Multinomial Logit Model and the existing literature ...
  • Computation of systemic risk measures: a mixed-integer linear programming approach 

    Meimanjanov, Nurtai (Bilkent University, 2019-01)
    In the scope of nance, systemic risk is concerned with the instability of a nancial system, where the members of the system are interdependent in the sense that the failure of some institutions may trigger defaults ...
  • Risk-averse multi-class support vector machines 

    Karagöz, Ayşenur (Bilkent University, 2018-12)
    A classification problem aims to identify the class of new observations based on the previous observations whose classes are known. It has many applications in a variety of disciplines such as medicine, finance and ...
  • Combinatorial multi-armed bandits: applications and analyses 

    Sarıtaç, Anıl Ömer (Bilkent University, 2018-09)
    We focus on two related problems: Combinatorial multi-armed bandit problem (CMAB) with probabilistically triggered arms (PTAs) and Online Contextual Influence Maximization Problem with Costly Observations (OCIMP-CO) ...
  • Assortment planning with premium services 

    Akçakuş, Emine İrem (Bilkent University, 2018-09)
    We consider the assortment planning problem of an online retailer who offers products with multiple service types which differ in delivery time. We assume that customers make their choices according to the multinomial ...
  • Generating evenly distributed equitably efficient solutions in multi-objective optimization problems 

    Bashir, Bashir Abdullahi (Bilkent University, 2018-09)
    We consider multi-objective optimization (MOP) problems where the decision maker (DM) has equity concerns. We assume that the preference model of the DM satisfies properties related to inequity-aversion, hence we focus ...
  • A mathematical modeling approach for managing regional blood bank operations 

    Dilaver, Halit Metehan (Bilkent University, 2018-09)
    Blood bank operations are complex affairs since they involve supply chain management of highly perishable goods such as whole blood and blood products. The Turkish Red Crescent (TRC), who is the main responsible organization ...

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