Now showing items 1-20 of 24

    • A branch-and-cut algorithm for the hub location and routing problem 

      Rodríguez-Martín, I.; Salazar-González, J-J.; Yaman, H. (Elsevier, 2014)
      We study the hub location and routing problem where we decide on the location of hubs, the allocation of nodes to hubs, and the routing among the nodes allocated to the same hubs, with the aim of minimizing the total ...
    • Branch-and-price approaches for the network design problem with relays 

      Yıldız, B.; Karaşan, O. E.; Yaman, H. (Elsevier, 2018)
      With different names and characteristics, relays play a crucial role in the design of transportation and telecommunication networks. In transportation networks, relays are strategic locations where exchange of drivers, ...
    • Constructing energy efficient bluetooth scatternets for wireless sensor networks 

      Saginbekov, Sain (Bilkent University, 2004)
      The improvements in the area of wireless communication and micro-sensor technology have made the deployment of thousands, even millions, of low cost and low power sensor nodes in a region of interest a reality. After ...
    • The cost and risk impacts of rerouting railroad shipments of hazardous materials 

      Glickman, T. S.; Erkut, E.; Zschocke, M. S. (Elsevier, 2007)
      Rail shipments of hazardous materials expose the population near the routes to the possibility of an accident resulting in a spill. Rail routes are determined by economic concerns such as route length and the revenue ...
    • Designing a road network for hazardous materials shipments 

      Erkut, E.; Alp, O. (Elsevier, 2007)
      We consider the problem of designating hazardous materials routes in and through a major population center. Initially, we restrict our attention to a minimally connected network (a tree) where we can predict accurately the ...
    • Distributed power-source-aware routing in wireless sensor networks 

      Tekkalmaz, M.; Korpeoglu, I. (Springer New York LLC, 2016)
      Although many applications use battery-powered sensor nodes, in some applications battery- and mains-powered nodes coexist. In this paper, we present a distributed algorithm that considers using mains-powered devices to ...
    • GridRoute : a multi-layered grid based routing protocol for delay tolerant mobile networks 

      Köksal, Emin Yiğit (Bilkent University, 2012)
      This work proposes a new routing protocol for delay-tolerant mobile networks (DTMNs) called GridRoute. The proposed protocol can be adopted considering network requirements such as low message delay or low resource usage. ...
    • The hazardous waste location-routing problem 

      Alumur, Sibel (Bilkent University, 2003)
      As a result of high industrialization and technology hazardous waste management problem has now become an unavoidable problem of the world. Hazardous waste management involves collection, transportation, treatment and ...
    • Hub Location Problem with Allowed Routing between Nonhub Nodes 

      Mahmutoğulları, A. I.; Kara, B. Y. (Wiley-Blackwell, 2015)
      In this study, we relax one of the general assumptions in the hub location literature by allowing routed flows between nonhub nodes. In hub networks, different flows are consolidated and routed via collection, interhub, ...
    • Minimum cost path problem for Plug-in Hybrid Electric Vehicles 

      Arslan O.; Yildiz, B.; Karaşan O.E. (Elsevier Ltd, 2015)
      We introduce a practically important and theoretically challenging problem: finding the minimum cost path for PHEVs in a road network with refueling and charging stations. We show that this problem is NP-complete and present ...
    • A new model for the hazardous waste location-routing problem 

      Alumur, S.; Kara, B. Y. (Elsevier, 2007)
      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, ...
    • A novel optimization algorithm for video placement and routing 

      Bektaş, T.; Oǧuz, O.; Ouveysi, I. (Institute of Electrical and Electronics Engineers, 2006)
      In this paper, we propose a novel optimization algorithm for the solution of the video placement and routing problem based on Lagrangean relaxation and decomposition. The main contribution can be stated as the use of integer ...
    • The periodic vehicle routing problem with driver consistency 

      Rodríguez-Martín, I.; Salazar-González, J. -J.; Yaman, H. (Elsevier, 2018)
      The Periodic Vehicle Routing Problem is a generalization of the classical capacitated vehicle routing problem in which routes are determined for a planning horizon of several days. Each customer has an associated set of ...
    • Power efficient data gathering and aggregation in wireless sensor networks 

      Tan, Hüseyin Özgür (Bilkent University, 2004)
      Recent developments in processor, memory and radio technology have enabled wireless micro-sensor networks which are deployed to collect useful information from an area of interest. The sensed data must be gathered and ...
    • PSAR: Power-source-aware routing in ZigBee networks 

      Tekkalmaz, M.; Korpeoglu I. (2012)
      ZigBee is a recent wireless networking technology built on IEEE 802.15.4 standard and designed especially for low-data rate and low-duty cycle applications such as home and building automation and sensor networks. One of ...
    • Regenerator location problem in flexible optical networks 

      Yıldız, B.; Karaşan, O. E. (Institute for Operations Research and the Management Sciences (I N F O R M S), 2017-06)
      In this study, we introduce the regenerator location problem in flexible optical networks. With a given traffic demand, the regenerator location problem in flexible optical networks considers the regenerator location, ...
    • A reordering-free multipath traffic engineering architecture for DiffServ-MPLS networks 

      Akar, N.; Hokelek I.; Atik, M.; Karasan, E. (Institute of Electrical and Electronics Engineers Inc., 2003)
      We propose a novel traffic engineering architecture for IP networks with multiprotocol label switching (MPLS) backbones. In this architecture, two (primary and secondary) label switched paths (LSPs) are established among ...
    • Routing and scheduling approaches for energy-efficient data gathering in wireless sensor networks 

      Tan, Hüseyin Özgür (Bilkent University, 2011)
      A wireless sensor network consists of nodes which are capable of sensing an environment and wirelessly communicating with each other to gather the sensed data to a central location. Besides the advantages for many ...
    • Routing in delay tolerant networks with periodic connections 

      Mergenci, Cem (Bilkent University, 2010)
      In delay tolerant networks (DTNs), the network may not be fully connected at any instance of time, but connections occurring between nodes at di erent times make the network connected through the entire time continuum. ...
    • Routing in delay tolerant networks with periodic connections 

      Mergenci, C.; Korpeoglu, I. (SpringerOpen, 2015)
      In delay tolerant networks (DTNs), the network may not be fully connected at any instant of time, but connections occurring between nodes at different times make the network connected through the entire time continuum. In ...