Browsing by Author "Ekici, Ali"
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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 ... -
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 ... -
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 ... -
Creating an evacuation plan during an emergency by coordinating vehicles
Bacaksız, Hazal (2018-10)As disaster relief operations required quick and e ective service, especially evacuating victims from disaster area will be more problematic. In this paper, the problem is about evacuating the people who need service after ... -
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 ... -
Dynamic facility location with supplier selection under quantity discount
Emirhüseyinoğlu, Görkem; Ekici, Ali (Elsevier, 2019-08)Retailers have to consider several factors when making facility location decisions including suppliers' and customers' locations, customer demand and price offered by suppliers. In this study, we analyze the multi-period ... -
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 ... -
Facility location with supplier selection under quantity discount
Emirhüseyinoğlu, Görkem (2017-07)The purpose of this study is to identify the locations of distribution facilities and choose the suppliers in a two echelon system where items are purchased from suppliers under quantity discount policy and distributed to ... -
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 ... -
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 ... -
Modeling influenza pandemic and planning food distribution
Ekici, Ali; Keskinocak, P.; Swann, J. L. (Informs, 2014)Based on the recent incidents of H5N1, H1N1, and influenza pandemics in history (1918, 1957, and 1968) experts believe that a future influenza pandemic is inevitable and likely imminent. Although the severity of influenza ... -
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 ... -
Robust scheduling for parallel machines with sequence dependent setup times and uncertain breakdowns
Top, Ayşenur Betül (2017-08)In this study, machine scheduling activities in the plastic injection production facility of a company competing in electronic sector is investigated. The company designs the products and picks order from customers for ... -
Routing and inventory loading problem for heterogeneous vehicle fleet with compartments
Yılmaz, Türkay Umut (2018-05)This thesis focuses on multi compartment heterogeneous vehicle fleet routing problems for the case of incompatible products dedicated to separately within the compartments. In order to supply the different product demand ... -
Service level satisfaction during shortages for health networks: base stock inventory and transshipment policies
Bozkır, Cem Deniz Çağlar (2018-05)In this study, we consider a system of healthcare providers, which face the same uncertain supply disruptions (e.g., regional, nationwide, or worldwide drug shortages). Each hospital observes a stochastic demand and if ...
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