Browsing by Author "Özener, Okan Örsan"
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Inventory routing for the last mile delivery of humanitarian relief supplies
Ekici, Ali; Özener, Okan Örsan (Springer Nature, 2020-09)Fast and equitable distribution of the humanitarian relief supplies is key to the success of relief operations. Delayed and inequitable deliveries can result in suffering of affected people and loss of lives. In this study, ... -
Lane-exchange mechanisms for truckload carrier collaboration
Özener, Okan Örsan; Ergun, Ö.; Savelsbergh, M. (Informs, 2011-02)Because of historically high fuel prices, the trucking industry's operating expenses are higher than ever and thus profit margins are lower than ever. To cut costs, the trucking industry is searching for and exploring new ... -
League scheduling and game bundling in sports industry
Duran, S.; Özener, Okan Örsan; Yakıcı, E. (Elsevier, 2014-08)Most sport clubs offer season tickets first and they allow purchasing single tickets at a later date. There are several decision problems within this context; the determination of the optimal time at which the switch from ... -
A location-routing problem for waste oil collection
Varandi, Fahriye Naderi (2016-06)This thesis is motivated by a real-world waste cooking oil collection system. Specifically, we focus on a biodiesel production company, which regularly collects waste cooking oil from di erent sources such as fast food ... -
Managing platelet supply through improved routing of blood collection vehicles
Özener, Okan Örsan; Ekici, Ali (Elsevier, 2018-10)In this paper, we study the routing of blood collection vehicles for improving the platelet supply in the blood supply chain. In order to extract platelets, donated blood has to be processed at a central processing facility ... -
Multi-compartment inventory routing problem with adjustable compartment sizes
Ölmez, Ömer Berk (2021-06-10)In this study, we focus on a problem where the supplier manages the customers’ in ventories and coordinates the distribution of multiple products to customers. Hereby the supplier can minimize the transportation costs by ... -
Near-optimal modified base stock policies for the capacitated inventory problem with stochastic demand and fixed cost
Özener, Okan Örsan; Güllü, R.; Erkip, N. (World Scientific Publishing, 2014-06)In this study, we investigate a single-item, periodic-review inventory problem where the production capacity is limited and unmet demand is backordered. We assume that customer demand in each period is a stationary, discrete ... -
Pricing decisions in a strategic single retailer/dual suppliers setting under order size constraints
Ekici, Ali; Özener, Başak Altan; Özener, Okan Örsan (Informa Group, 2016)In this paper, we study a duopolistic market of suppliers competing for the business of a retailer. The retailer sets the order cycle and quantities from each supplier to minimize its annual costs. Different from other ... -
Prioritization and parallel execution of test cases for certification testing
Dirim, Şahin (2021-06-08)Systems that are developed in the consumer electronics domain are subject to testing for certification regularly. For instance, each Smart TV product must go through a certification process that is regulated by application ... -
Selection of event tickets for bundling in sports and entertainment industry
Yakıcı, E.; Özener, Okan Örsan; Duran, S. (Elsevier, 2014-08)Most sports and entertainment firms offer season tickets first, and they allow purchasing single tickets at a later date. Basic decision problems within this context are the determination of optimal time at which switch ... -
Single machine scheduling with sequence dependent setup times
Lefkur, Burak (2021-06-10)In this thesis, we study a single machine scheduling problem with sequence dependent setup times where the jobs are processed in shifts with constant length. There is a certain amount of time between each pair of consecutive ... -
Solving a large-scale crew pairing problem
Erdoğan, G.; Haouari, M.; Matoglu, M. Ö.; Özener, Okan Örsan (Palgrave Macmillan, 2015)Airline companies seek to solve the problem of determining an assignment of crews to a pre-determined flight schedule with minimum total cost, called the Crew Pairing Problem (CPP). Most of the existing studies focus on ... -
Solving a large-scale integrated fleet assignment and crew pairing problem
Özener, Okan Örsan; Örmeci Matoğlu, M.; Erdoğan, G.; Haouari, M.; Sözer, Hasan (Springer International Publishing, 2017)Airline schedule planning problems are typically decomposed into smaller problems, which are solved in a sequential manner, due to the complexity of the overall problems. This results in suboptimal solutions as well as ... -
Solving the integrated shipment routing problem of a less-than-truckload carrier
Özener, Okan Örsan (Elsevier, 2017)We study a less-than-truckload (LTL) transportation network and investigate the potential benefits of implementing an integrated solution approach for shipment routing throughout this network. In LTL transportation, shipments ... -
Testing and scheduling applications under uncertainty
Yavuz, Tonguç (2021-02)In this thesis, we consider two different optimization problems under uncertainty. The first problem is identifying defective components in failed k-out-of-n systems. In the second part, we study the parallel machine ... -
Transportation planning for the relief items distribution during an emergency
Çankaya, Emre (2017-01)We study the inventory slack routing problem (ISRP) to improve planning of distribution of the relief supplies, which is a critical issue in emergency preparedness and response. The authority officials construct their ... -
A workforce planning model for fair schedules considering employee satisfaction, service level, and operating cost
Şimşek, Onur (2019-06-11)We study workforce planning issues for call centers and propose a solution approach with a scheduling model. In this study, we emphasize the effects of employee satisfaction, fair distribution of shifts, and agent-related ...
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