Browsing Industrial Engineering by Author "Özyeğin University"
Now showing items 101-120 of 215
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Hospital service levels during drug shortages: Stocking and transshipment policies for pharmaceutical inventory
Bozkır, Cem Deniz Çağlar; Kundakcıoğlu, Ömer Erhun; Henry, A. C. (Springer, 2022-07)In this study, we consider a health network that faces uncertain supply disruptions in the form of regional, nationwide, or worldwide drug shortages. Each hospital observes stochastic demand and if the drug is unavailable, ... -
Humanitarian relief distribution problem: an adjustable robust optimization approach
Avishan, Farzad; Elyasi, Milad; Yanıkoğlu, İhsan; Ekici, Ali; Özener, Okan Örsan (Informs, 2023-07)Management of humanitarian logistics operations is one of the most critical planning problems to be addressed immediately after a disaster. The response phase covers the first 12 hours after the disaster and is prone 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 ... -
HYGAR: a hybrid genetic algorithm for software architecture recovery
Elyasi, Milad; Simitcioğlu, Muhammed Esad; Saydemir, Abdullah; Ekici, Ali; Sözer, Hasan (ACM, 2022)Genetic algorithms have been used for clustering modules of a software system in line with the modularity principle. The goal of these algorithms is to recover an architectural view in the form of a modular structural ... -
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 ... -
Influence maximization in social networks under Deterministic Linear Threshold Model
Gürsoy, F.; Danış, Dilek Günneç (Elsevier, 2018-12)We define the new Targeted and Budgeted Influence Maximization under Deterministic Linear Threshold Model problem and develop the novel and scalable TArgeted and BUdgeted Potential Greedy (TABU-PG) algorithm which allows ... -
Integrated airline schedule design and fleet assignment: polyhedral analysis and benders’ decomposition approach
Sherali, H. D.; Bae, K.-H.; Haouari, Mohamed (Informs, 2010-01)The main airline operations consist of schedule planning, fleet assignment, aircraft routing, and crew scheduling. To improve profitability, we present in this paper an integrated fleet assignment model with schedule ... -
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 ... -
Integrated experimental design and nonlinear optimization to handle computationally expensive models under resource constraints
Pinter, Janos D.; Horvath, Z. (Springer Science+Business Media, 2013-09)In many real-world applications of optimization, the underlying descriptive system model is defined by computationally expensive functions: simulation modules, numerical models and other “black box” model components are ... -
Integrating social network effects in the share-of-choice problem
Danış, Dilek Günneç; Raghavan, S. (Wiley, 2017-12)Accounting for social network effects in marketing strategies has become an important issue. Taking a step back, we seek to incorporate and analyze social network effects on new product development and then propose a model ... -
Intelligent classification-based methods in customer profitability modeling
Ekinci, Y.; Duman, Ekrem (Springer International Publishing, 2015)The expected profits from customers are important informations for the companies in giving acquisition/retention decisions and developing different strategies for different customer segments. Most of these decisions can ... -
International roaming traffic optimization with call quality
Şahin, Ahmet; Demirel, Kenan Cem; Albey, Erinç; Gürsun, Gonca (SciTePress, 2019)In this study we focus on a Steering International Roaming Traffic (SIRT) problem with single service that concerns a telecommunication’s operators’ agreements with other operators in order to enable subscribers access ... -
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, ... -
IP-based energetic reasoning for the resource constrained project scheduling problem
Kooli, A.; Haouari, Mohamed; Hidri, L.; Neron, E. (Elsevier, 2010-08-01)In this paper, we consider the Resource Constrained Project Scheduling Problem (RCPSP). New feasibility tests for the energetic reasoning are introduced based on new integer programming (IP) formulations. Experimental ... -
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 ... -
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 ... -
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 ... -
Least-cost influence maximization on social networks
Danış, Dilek Günneç; Raghavan, S.; Zhang, R. (Informs, 2020-03)Viral-marketing strategies are of significant interest in the online economy. Roughly, in these problems, one seeks to identify which individuals to strategically target in a social network so that a given proportion of ... -
A literature review on inventory management in humanitarian supply chains
Koyuncu, Burcu Balçık; Bozkir, Cem Deniz Çağlar; Kundakcıoğlu, Ömer Erhun (Elsevier, 2016)In this paper, we present a review and analysis of studies that focus on humanitarian inventory planning and management. Specifically, we focus on papers which develop policies and models to determine how much to stock, ... -
Load dependent lead time modelling: a robust optimization approach
Albey, Erinç; Yanıkoğlu, İhsan; Uzsoy, R. (IEEE, 2018-01-04)Although production planning models using nonlinear CFs have shown promising results for semiconductor wafer fabrication facilities, the lack of an effective methodology for estimating the CFs is a significant obstacle to ...
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