Theses  Department of Industrial Engineering
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Decomposable sums and their implications on naturally quasiconvex risk measures
(Bilkent University, 202009)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 ... 
Endoflife inventory management problem: new results and insights
(Bilkent University, 202009)We consider a manufacturer who controls the inventory of spare parts in the endoflife 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
(Bilkent University, 202008)"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 lastmile deliveries with synchronous truck and drones
(Bilkent University, 202008)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
(Bilkent University, 202008)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 ... 
Radio communications interdiction problem
(Bilkent University, 202002)Tactical communications have always played a pivotal role in maintaining eﬀective command and control of troops operating in hostile, extremely fragile and dynamic battleﬁeld environments. Radio communications, in particular, ... 
Essays on bilateral trade with discrete types
(Bilkent University, 201911)Bilateral trade is probably the most common market interaction problem and can be considered as the simplest form of two sided markets where a seller and a buyer bargain over an indivisible object subject to incomplete ... 
An exact algorithm for biobjective integer programming problems
(Bilkent University, 201907)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
(Bilkent University, 201907)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
(Bilkent University, 201907)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
(Bilkent University, 201907)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
(Bilkent University, 201907)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
(Bilkent University, 201907)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
(Bilkent University, 201907)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. ... 
Optimizing airline operations under uncertainty
(Bilkent University, 201906)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 ... 
Locationlocation routing problem and its application on refugee camps
(Bilkent University, 201906)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
(Bilkent University, 201906)Power systems planning and operations is one of the most challenging problems in energy field due to its complex, largescale and nonlinear nature. Operating power systems with uncertainties and disturbances such as ... 
Green location and routing problems with conventional vehicles and drones
(Bilkent University, 201906)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 nonlinear cost structures
(Bilkent University, 201904)We first consider the assortment optimization problem with fixed product costs under the Mixtures of Multinomials (MMNL) Model. The problem is NPhard even under the Multinomial Logit Model and the existing literature ... 
Riskaverse multistage mixedinteger stochastic programming problems
(Bilkent University, 20190129)Riskaverse multistage mixedinteger stochastic programming problems form a class of extremely challenging problems since the problem size grows exponentially with the number of stages, they are nonconvex due to ...