Browsing Faculty of Engineering by OzU Authors "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 Electronics
Ekici, Ali; Elyasi, Milad; Özener, Okan Örsan; Sarıkaya, M. B. (Elsevier, 2019-11)In this paper, we analyze a variant of the unrelated parallel machine scheduling problem with the objective of minimizing the total tardiness and earliness in the presence of sequence-dependent setups, unequal release ... -
Blood supply chain management and future research opportunities
Ekici, Ali; Özener, Okan Örsan; Göktürk, Elvin Çoban (Springer, 2018)In this chapter, we discuss the challenges and research opportunities in the blood collection operations and explore the benefits of recent advances in the blood donation process. According to the regulations, donated blood ... -
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 ... -
Cost allocation mechanisms in a peer‐to‐peer network
Özener, Başak Altan; Özener, Okan Örsan (Wiley, 2019-01)This study analyzes a cooperative game between a service provider and a set of users. We consider a P2P network where the service provider broadcasts the content across the network and the users collaborate to seed the ... -
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 ... -
Cyclic ordering policies from capacitated suppliers under limited cycle time
Ekici, Ali; Özener, Okan Örsan; Duran, S. (Elsevier, 2019-02)In this paper, we study the ordering policy of a manufacturer/retailer which procures a single item from multiple capacitated suppliers and satisfies an exogenous deterministic and constant demand. Manufacturer's objective ... -
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 effective formulation of the multi-criteria test suite minimization problem
Özener, Okan Örsan; Sözer, Hasan (Elsevier, 2020-10)Test suite minimization problem has been mainly addressed by employing heuristic techniques or integer linear programming focusing on a specific criterion or bi-criteria. These approaches fall short to compute optimal ... -
Humanitarian relief supplies distribution: an application of inventory routing problem
Çankaya, Emre; Ekici, Ali; Özener, Okan Örsan (Springer, 2019-12)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 ... -
Improving blood products supply through donation tailoring
Özener, Okan Örsan; Ekici, Ali; Göktürk, Elvin Çoban (Elsevier, 2019-02)Recent technological advances, called Multicomponent Apheresis, allow tailoring the blood donations based on the demand and current inventory levels of blood products. Different from the most common type of blood donation ... -
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 ... -
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 ... -
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; 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 ... -
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, 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 ...
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