Recent Submissions

  • Optimizing airline operations under uncertainty 

    Aydıner, Özge Şafak (Bilkent University, 2019-06)
    Fluctuations in passenger demand, airport congestion, and high fuel costs are the main threats to airlines' profit, thereby need to be carefully addressed in airline scheduling problems. This study takes an advantage of ...
  • 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 ...
  • Network design problems and value of control mechanisms in power systems 

    Sarhan, Meltem Peker (Bilkent University, 2019-06)
    Power systems planning and operations is one of the most challenging problems in energy field due to its complex, large-scale and nonlinear nature. Operating power systems with uncertainties and disturbances such as ...
  • Green location and routing problems with conventional vehicles and drones 

    Dükkancı, Okan (Bilkent University, 2019-06)
    Green Location and Routing Problems extend the network design problems that consider location and routing decisions by explicitly accounting environmental impacts such as CO2 emissions caused by fuel or energy consumption ...
  • 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 ...
  • Risk-averse multi-stage mixed-integer stochastic programming problems 

    Mahmutoğulları, Ali İrfan (Bilkent University, 2019-01-29)
    Risk-averse multi-stage mixed-integer stochastic programming problems form a class of extremely challenging problems since the problem size grows exponentially with the number of stages, they are non-convex due to ...
  • 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 ...
  • Age and lifetime based policies for perishable items 

    Poormoaied, Saeed (Bilkent University, 2018-11)
    Many inventory systems hold items which perish after a specific time. Upon perishing, the inventory level falls down to zero which may incur irreparable costs to the system. Therefore, developing a genius control policy ...
  • 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 ...
  • Multi-location assortment optimization under lead time effects 

    Karaca, Utku (Bilkent University, 2018-08)
    We have investigated the assortment planning problem for an online retailer that has multiple ful llment centers to maximize its expected pro t. Each ful llment center is responsible for a customer segment which has its ...
  • Multi-stage stochastic programming for demand response optimization 

    Şahin, Munise Kübra (Bilkent University, 2018-08)
    The increase in the energy consumption puts pressure on natural resources and environment and results in a rise in the price of energy. This motivates residents to schedule their energy consumption through demand response ...
  • Covering vehicle routing problem: applications for refugee related services 

    Buluç, Elfe Naz (Bilkent University, 2018-07)
    The world is facing a refugee crisis because of the ongoing war in Syria, and it is important to develop refugees' life conditions and increase their integration to the host communities. There are several services given ...
  • Post-disaster assessment routing problem 

    Ağlar, Buse Eylül Oruç (Bilkent University, 2018-07)
    Post-disaster assessment operations constitute the basis for the operations conducted in the response phase of the disaster management. Through the assessment of the road segments, the extent of damage and the amount of ...
  • Integrated production transportation and storage policies with carbon costs 

    Erman, Başak (Bilkent University, 2018-07)
    Governments adopt carbon policies such as taxation in order achieve carbon reduction targets set by global agreements. In this study, we analyze a two-echelon supply chain model where production and dispatching decisions ...
  • Stochastic shelter site location under multi-hazard scenarios 

    Özbay, Eren (Bilkent University, 2018-07)
    In some cases, natural disasters happen successively (e.g. a tsunami following an earthquake) in close proximity of each other, even if they are not correlated. This study locates shelter sites and allocates the a ected ...
  • Deblurring text images affected by multiple kernels 

    Dizdarer, Tolga (Bilkent University, 2018-06)
    Image deblurring is one of the widely studied and challenging problems in image recovery. It is an estimation problem dealing with restoration of a linearly transformed image that is additional disturbed with noise. In ...

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