Browsing by Author "Ekici, Ali"
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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, ... -
A large neighborhood search algorithm and lower bounds for the variable-sized bin packing problem with conflicts
Ekici, Ali (Elsevier, 2023-08-01)In this paper, we study the Variable-Sized Bin Packing Problem with Conflicts (VSBPPC). In VSBPPC, a set of items each with a certain size has to be packed into bins of various types. Bin types differ in terms of their ... -
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 ... -
Metaheuristic approaches for maximum blood collection problem
Thanks to recent technological and medical advances, blood components can now be extracted from whole blood after a donation. One of such components is the platelet, which has a wide range of uses in medical fields, including ... -
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 ... -
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 ... -
Neural network estimatorsfor optimal tour lengths of TSP instances with arbitrary node distributions
To achieve operational efficiency in logistics, we need to solve complex routing problems. Due to their complexity, these problems are often solved sequentially, i.e., using cluster-first route-second (CFRS) type frameworks. ... -
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 ... -
Open-end bin packing problem with conflicts
In this thesis study, we focus on a new variant of the famous Bin Packing Problem (BPP) called the Open-End Bin Packing Problem with Conflicts (OEBPPC) which combines the Open-End Bin Packing Problem (OEBPP) and the Bin ... -
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 ... -
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 ... -
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 ... -
Set-covering based heuristic approaches for the problems from the printing industry
In this thesis, we focus on two different planning production problems coming from the printing industry. The first problem is the label printing problem and the second one is a variant of the cover printing problem. In ... -
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 modified TSP problem by a greedy heuristic for cost minimization
Çal, Murat (2017-06)Photographing a large area in an instant is only made possible by satellites. Satellites are able to help reducing the time required for the photographing/monitoring process, however, satellite images are not available all ... -
A split delivery vehicle routing problem for daily tobacco delivery
One of the Turkey's largest cigarette manufacturer, located in Izmir, receives distributors' orders from all over Turkey every day. Processed and packed cigarettes are distributed to all distributors in different locations ...
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