Browsing by Author "Özener, Okan Örsan"
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Allocating cost of service to customers in inventory routing
Özener, Okan Örsan; Ergun, Ö.; Savelsbergh, M. (Informs, 2013)Vendor-managed inventory VMI replenishment is a collaboration between a supplier and its customers, where the supplier is responsible for managing the customers' inventory levels. In the VMI setting we consider, the supplier ... -
An application of unrelated parallel machine scheduling with sequence-dependent setups at Vestel Electronic
Sarıkaya, Merve Burcu (2017-08)Vestel Electronics produces LCD/LED televisions and has a significant market share in consumer electronics sector in Europe. TV manufacturing is planned based on a make-to order strategy, and Vestel uses 15 assembly lines ... -
Coordinated inventory planning for humanitarian relief agencies
Karaca, Meserret (2016-07)Pre-positioning relief supplies in strategic locations around the world is essential for effective disaster response, especially during the critical 72 hours immediately following the disaster. Most of the existing studies ... -
Coordinating collection and appointment scheduling operations at the blood donation sites
Mobasher, A.; Ekici, Ali; Özener, Okan Örsan (Elsevier, 2015-09)According to the regulations imposed by the U.S. Food and Drug Administration and the American Association of Blood Banks, in order to extract platelets, donated blood units have to be processed at a processing center ... -
Cyclic delivery schedules for an inventory routing problem
Ekici, Ali; Özener, Okan Örsan; Kuyzu, G. (Informs, 2015-11)We consider an inventory routing problem where a common vendor is responsible for replenishing the inventories of several customers over a perpetual time horizon. The objective of the vendor is to minimize the total cost ... -
Developing a collaborative planning framework for sustainable transportation
Özener, Okan Örsan (Hindawi Publishing, 2014)Currently, as being the highest petroleum consuming sector in the world, transportation significantly contributes to the total greenhouse gas emissions in the world. Road transportation not only is responsible for approximately ... -
An exact approach for a dynamic workforce scheduling problem
Koç, Ersin (2018-01)Taking into account the global and national rules and regulations, assigning a given number of employees to planned shifts while paying attention to required working hours, rest times and off day/days is one of the most ... -
Humanitarian relief supplies distribution: an application of inventory routing problem
Çankaya, Emre; Ekici, Ali; Özener, Okan Örsan (Springer, 2018-02-06)In this paper, we study the distribution of humanitarian relief supplies. In humanitarian relief, supplies including food, water and medication are received in batches/waves from the suppliers and the donors. Then, these ... -
Integrated blood collection and appointment scheduling
Mobasher, A.; Ekici, Ali; Özener, Okan Örsan (Institute of Industrial Engineers, 2012)Considering the processing requirements of donated blood, we study an integrated blood collection and appointment scheduling problem. We develop a mixed integer programming model to maximize the amount of donated blood ... -
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 ... -
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; Altan, Başak; 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 ... -
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 ... -
Solving a large-scale crew pairing problem
Erdoğan, Güneş; Haouari, Mohamed; Örmeci Matoğlu, Melda; 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 ... -
Transportation planning for the relief items distribution during an emergency
Emre, Çankaya (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 ...
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