Browsing by Author "Alumur, S."
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Item Open Access A hub covering network design problem for cargo applications in Turkey(Palgrave Macmillan, 2009) Alumur, S.; Kara, B. Y.Hub location problems involve locating hub facilities and allocating demand nodes to hubs in order to provide service between origin-destination pairs. In this study, we focus on cargo applications of the hub location problem. Through observations from the Turkish cargo sector, we propose a new mathematical model for the hub location problem that relaxes the complete hub network assumption. Our model minimizes the cost of establishing hubs and hub links, while designing a network that services each origin-destination pair within a time bound. We formulate a single-allocation hub covering model that permits visiting at most three hubs on a route. The model is then applied to the realistic instances of the Turkish network and to the Civil Aeronautics Board data set.Item Open Access Network hub location problems: The state of the art(Elsevier, 2008) Alumur, S.; Kara, B. Y.Hubs are special facilities that serve as switching, transshipment and sorting points in many-to-many distribution systems. The hub location problem is concerned with locating hub facilities and allocating demand nodes to hubs in order to route the traffic between origin-destination pairs. In this paper we classify and survey network hub location models. We also include some recent trends on hub location and provide a synthesis of the literature.Item Open Access A new model for the hazardous waste location-routing problem(Elsevier, 2007) Alumur, S.; Kara, B. Y.Hazardous waste management involves the collection, transportation, treatment and disposal of hazardous wastes. In this paper a new multiobjective location-routing model is proposed. Our model also includes some constraints, which were observed in the literature but were not incorporated into previous models. The aim of the proposed model is to answer the following questions: where to open treatment centers and with which technologies, where to open disposal centers, how to route different types of hazardous waste to which of the compatible treatment technologies, and how to route waste residues to disposal centers. The model has the objective of minimizing the total cost and the transportation risk. A large-scale implementation of the model in the Central Anatolian region of Turkey is presented.Item Open Access Operational research: methods and applications(Taylor and Francis Ltd., 2023-12-27) Petropoulos, F.; Laporte, G.; Aktas, E.; Alumur, S.; Archetti, C.; Ayhan, H.; Battarra, M.; Bennell, J.; Bourjolly, J.; Boylan, J. E.; Breton, M.; Canca, D.; Charlin, L.; Chen, B.; Cicek, C.; Cox, L.; Currie, C. S.M.; Demeulemeester, E.; Ding, L.; Disney, S. M.; Ehrgott, M.; Eppler, M. J.; Erdoğan, G.; Fortz, B.; Franco, L. A.; Frische, J.; Greco, S.; Gregory, A. J.; Hämäläinen, R. P.; Herroelen, W.; Hewitt, M.; Holmström, J.; Hooker, J. N.; Işık, T.; Johnes, J.; Kara, B. Y.; Karsu, Özlem; Kent, K.; Köhler, C.; Kunc, M.; Kuo, Y.; Letchford, A. N.; Leung, J.; Li, D.; Li, H.; Lienert, J.; Ljubić, I.; Lodi, A.; Lozano, S.; Lurkin, V.; Martello, S.; McHale, I. G.; Midgley, G.; Morecroft, J. D.W.; Mutha, A.; Oğuz, C.; Petrovic, S.; Pferschy, U.; Psaraftis, H. N.; Rose, S.Throughout its history, Operational Research has evolved to include methods, models and algorithms that have been applied to a wide range of contexts. This encyclopedic article consists of two main sections: methods and applications. The first summarises the up-to-date knowledge and provides an overview of the state-of-the-art methods and key developments in the various subdomains of the field. The second offers a wide-ranging list of areas where Operational Research has been applied. The article is meant to be read in a nonlinear fashion and used as a point of reference by a diverse pool of readers: academics, researchers, students, and practitioners. The entries within the methods and applications sections are presented in alphabetical order. The authors dedicate this paper to the 2023 Turkey/Syria earthquake victims. We sincerely hope that advances in OR will play a role towards minimising the pain and suffering caused by this and future catastrophes.