Browsing Industrial Engineering by Author "Özener, Okan Örsan"
Now showing items 21-36 of 36
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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 ... -
Neural network estimators for optimal tour lengths of traveling salesperson problem instances with arbitrary node distributions
Varol, Taha; Özener, Okan Örsan; Albey, Erinç (Informs, 2024)It is essential to solve complex routing problems to achieve operational efficiency in logistics. However, because of their complexity, these problems are often tackled sequentially using cluster-first, route-second ... -
A non-clustered approach to platelet collection routing problem
Talebi Khameneh, R.; Elyasi, Milad; Özener, Okan Örsan; Ekici, Ali (Elsevier, 2023-12)One of the blood components that can be extracted from whole blood is the platelet, which has a wide range of uses in medical fields. Due to the perishable nature of platelets, it is recommended that the separation occurs ... -
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 of embedded systems
Dirim, Ş.; Özener, Okan Örsan; Sözer, Hasan (Springer, 2022-07-22)Testing for certification of embedded systems is common in consumer electronics domain. Application vendors provide test suites that have to be repeatedly executed for each product. Multiple test stations can be used in ... -
Production planning with flexible manufacturing systems under demand uncertainty
Elyasi, M.; Özener, Başak Altan; Ekici, Ali; Özener, Okan Örsan (Taylor & Francis, 2024)This paper delves into the impacts of an ongoing global crisis on the resilience of supply chains. Furthermore, it proposes measures to address and mitigate the disruptions caused by the prevailing uncertainties. For ... -
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 ... -
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 ... -
Stochastic production planning with flexible manufacturing systems and uncertain demand: A column generation-based approach
Elyasi, Milad; Özener, Başak Altan; Ekici, Ali; Özener, Okan Örsan; Yanıkoğlu, İhsan (Elsevier, 2022)The ongoing pandemic, namely COVID-19, has rendered widespread economic disorder. The deficiencies have delayed production at manufacturers in several industries on the supply side. The effects of disruption were more ... -
Summary of an effective formulation of the multi-criteria test suite minimization problem
Özener, Okan Örsan; Sözer, Hasan (IEEE, 2022)This is an extended abstract of the article: Okan Orsan Ozener and Hasan Sozer, 'An Effective Formulation of the Multi-Criteria Test Suite Minimization Problem', published in the Journal of Systems and Software, Vol. 168, ... -
Supplier selection and order allocation in the presence of suppliers with exact annual capacity
Ekici, Ali; Özener, Okan Örsan; Elyasi, Milad (Inderscience Enterprises Ltd., 2021)In this paper, we focus on the supplier selection and order quantity allocation for a single retailer. The retailer orders a product from multiple suppliers with capacities, adds value to the product and fulfils the demand ... -
A two-phase heuristic algorithm for the label printing problem
Çankaya, Emre; Ekici, Ali; Özener, Okan Örsan (Springer, 2023-04)In this paper, we study the label printing problem (LPP) which has applications in the printing industry. In LPP, the demand for a set of labels is satisfied by printing the labels using templates with multiple slots. Given ... -
A variable neighborhood search based matheuristic for a waste cooking oil collection network design problem
Ölmez, Ömer Berk; Gültekin, Ceren; Koyuncu, Burcu Balçık; Ekici, Ali; Özener, Okan Örsan (Elsevier, 2022-10)Households produce large amounts of waste cooking oil (WCO), which should be disposed properly to avoid its negative impacts on the environment. Using WCO as raw material in biodiesel production is an effective disposal ...
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