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Recent Submissions

Tail assignment problem with hour-to-cycle ratio constraints Aydoğan, Çiya; Gürel, Sinan (2025-04-01) Effective management of hour-to-cycle performance is crucial for any aircraft operating under an operating lease contract. This protects an airline from incurring supplemental rental payments that arise from leasing contra...
Interactive biobjective optimization algorithms and an application to UAV routing in continuous space Tureci-Isik, Hannan; Köksalan, Mustafa Murat; Tezcaner-Öztürk, Diclehan (2025-03-01) We develop interactive optimization algorithms for biobjective problems with continuous nondominated frontiers to search for the most preferred solution of a decision maker who is assumed to have an underlying linear or qu...
Energy-constrained orienteering problem for green tourist trip design: Mathematical formulation and heuristic solution approaches Karabaş, Tolga; Tural, Mustafa Kemal (2025-02-01) Planning a touristic itinerary is a challenging task that requires personalized tour generation for tourists interested in visiting available points of interest (POIs). The negative externalities of using vehicles (e.g., e...
Defining faces, defying borders: authority conflicts between medical specialties through cosmetic interventions ERGUR, ALİ; Akkaya, Beril; Saral, C. (2024-12-01) At first glance, medical specializations seem to be delineated according to well-defined scientific criteria; the apparently-functional division of labor generates a general hierarchy of specialized knowledge and practice....
Compound effect of closing the loop and servitization in supply chains Alegoz, Mehmet; Karaer, Özgen (2024-04-01) Companies generally strive to become more sustainable by changing their business models or their supply chain structures. In this study, we evaluate the two aspects together; i.e., the compound effect of adopting servitiza...
Disassembly line balancing with hazardous task failures – Model based solution approaches Göksoy Kalaycılar, Eda; Azizoğlu, Meral; Batun, Sakine (2024-04-01)
An airport gate reassignment problem with gate closures Poyraz, Dursen Deniz; Azizoğlu, Meral (2024-03-01) In this study, we consider an airport gate reassignment problem where an airport has assigned gates to aircraft, but then a disruption occurs at some of the gates. After the disruption, we need to reassign the aircraft to ...
A heuristic approach to the stochastic capacitated single allocation hub location problem with Bernoulli demands Andaryan, Abdullah Zareh; Mousighichi, Kasra; Ghaffarınasab, Nader (2024-02-01) Hubs are critical components of transportation and distribution systems, and hub networks play a special role in freight and passenger transportation services worldwide. This paper studies a capacitated single allocation h...
Energy efficient scheduling of a two machine robotic cell producing multiple part types Aydoğan, Çiya; Gürel, Sinan (2024-01-01) This paper studies robot speed control decisions and the energy consumption objective in a cyclic robotic cell scheduling problem. The study considers a two-machine flow shop cell that produces multiple part types. A robot...
Multi-objective route planning of an unmanned air vehicle in continuous terrain: An exact and an approximation algorithm DAŞDEMİR, ERDİ; Köksalan, Mustafa Murat; TEZCANER ÖZTÜRK, DİCLEHAN (2024-01-01) Unmanned Aerial Vehicles (UAVs) are widely used for military and civilian purposes. Effective route planning is an important component of their successful missions. In this study, we address the route planning problem of a...
Population-based exploration in reinforcement learning through repulsive reward shaping using eligibility traces Bal, Melis Ilayda; İyigün, Cem; Polat, Faruk; Aydın, Hüseyin (2024-01-01) Efficient exploration plays a key role in accelerating the learning performance and sample efficiency of reinforcement learning tasks. In this paper we propose a framework that serves as a population-based repulsive reward...
Optimal co-development contracts for companion diagnostics Batun, Sakine; Begen, Mehmet A.; Zaric, Gregory S. (2024-01-01) The market for companion diagnostics is expected to be a US$10.07 billion by 2026. Companion diagnostics have the potential to make expensive drugs cost-effective by identifying patients who would benefit from them. We con...
Revealing third-order interactions through the integration of machine learning and entropy methods in genomic studies İyigün, Cem; Aydın Son, Yeşim (2024-01-01) BackgroundNon-linear relationships at the genotype level are essential in understanding the genetic interactions of complex disease traits. Genome-wide association Studies (GWAS) have revealed statistical association of th...
Energy efficient scheduling in a robotic cell with a material handling robot serving two parallel machines Aydoğan, Çiya; Gürel, Sinan (2024-01-01) As the robots take over more logistics tasks in factories, the energy consumption of material handling robots becomes a significant concern. This study considers a robotic cell with two parallel machines and a material-han...
An analysis of ambulance location problem from an equity perspective Akdogan, M. Altan; Bayındır, Zeynep Pelin; İyigün, Cem (2023-12-01) In this paper, we study the Emergency Medical Services (EMS) vehicle location problem from an equity perspective. We construct several mathematical programming models using a set of objective functions and constraints comm...
Scheduling a dual gripper material handling robot with energy considerations Gürel, Sinan; Gultekin, Hakan; Emiroglu, Nurdan (2023-04-01) Robotic cells are serial production systems that consist of a number of machines and a material handling robot that transfers parts between the machines. Energy consumption of a robot during its move between two machines c...
Finding the Nondominated Set and Efficient Integer Vectors for a Class of Three-Objective Mixed-Integer Linear Programs Ceyhan, Gokhan; Köksalan, Mustafa Murat; Lokman, Banu (2023-03-01) We consider a class of three-objective mixed-integer linear programs (MILPs) where at least one of the objective functions takes only discrete values. These problems commonly occur in MILPs where one or more of the three o...
Biobjective route planning of an unmanned air vehicle in continuous space TEZCANER ÖZTÜRK, DİCLEHAN; Köksalan, Mustafa Murat (2023-02-01) We consider the route planning problem of an unmanned air vehicle (UAV) in a continuous space that is monitored by radars. The UAV visits multiple targets and returns to the base. The routes are constructed considering the...
An exact solution method and a genetic algorithm-based approach for the unit commitment problem in conventional power generation systems Karabaş, Tolga; Meral, Fatma Sedef (2023-02-01) The unit commitment problem (UCP) is one of the fundamental problems in power systems planning and operations that comprises two decisions: commitment and dispatching of conventional generating units. The objective is to m...
Finding an energy efficient path for plug-in electric vehicles with speed optimization and travel time restrictions Erdoğan, Bilgenur; Tural, Mustafa Kemal; Atashi Khoei, Arsham (2023-02-01) Transportation is one of the main factors when global total energy consumption is considered and is a significant contributor to emissions of harmful gases including carbon dioxide (CO2). Due to their lower tailpipe CO2 em...

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