Now showing items 1-20 of 23

    • Analysis and applications of replenishment problems under stepwise transportation costs and generalized wholesale prices 

      Konur, D.; Toptal, A. (2012)
      In this study, we analyze the replenishment decision of a buyer with the objective of maximizing total expected profits. The buyer faces stepwise freight costs in inbound transportation and a hybrid wholesale price schedule ...
    • Aras Kargo’nun kuruluşu ve Türkiye’nin lojistik sektorüne katkıları 

      Aras, Ecemnaz; Dadağlıoğlu, Eren; Yaşar, Elif Bircesu; Korkut, Beyza; Ateş, Ladin (Bilkent University, 2020)
      1979 yılında Celal Aras ve kardeşleri Canpolat ve Hikmet Aras tarafından kurulan Aras Dağıtım ve Pazarlama, hızlı bir şekilde oluşturduğu dağıtım ağı gücüyle, bu gücün taşımacılıkta da kullanılması kararı alınarak 1989'da ...
    • Assessment of hazardous material risks for rail yard safety 

      Glickman, T. S.; Erkut, E. (Elsevier, 2007)
      This paper illustrates the application of quantitative risk assessment in a rail yard where tank cars of hazardous materials are received and stored. The assessment was conducted in response to community concerns about ...
    • Coordinated inventory replenishment and outsourced transportation operatoins 

      Gürler, Ü.; Alp, O.; Büyükkaramikli, N. C. (Elsevier, 2014-10)
      We consider a one-warehouse N retailers supply chain with stochastic demand. Inventory is managed in-house whereas transportation is outsourced to a 3PL provider. We develop analytical expressions for the operating ...
    • Coordinated logistics: replenishment with capacitated transportation for a supply chain 

      Büyükkaramikli, N. C.; Gürler, Ü.; Alp, O. (POMS, 2014-01)
      In this study, we consider the integrated inventory replenishment and transportation operations in a supply chain where the orders placed by the downstream retailer are dispatched by the upstream warehouse via an in-house ...
    • 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 emergency response networks for hazardous materials transportation 

      Berman O.; Verter V.; Kara, B.Y. (2007)
      Undesirable consequences of dangerous goods incidents can be mitigated by quick arrival of specialized response teams at the accident site. We present a novel methodology to determine the optimal design of a specialized ...
    • Endogenous effects of hubbing on flow intensities 

      Taner, M. R.; Kara, B. Y. (Springer, 2016)
      Location of hub facilities and the allocation decisions in transport networks endogenously affect both the flow intensities and the transportation costs. Since the introduction of the hub location problem to the operations ...
    • Energy-saving quality road lighting with colloidal quantum dot nanophosphors 

      Erdem, T.; Kelestemur, Y.; Soran-Erdem, Z.; Ji, Y.; Demir, Hilmi Volkan (Walter de Gruyter GmbH, 2014)
      Here the first photometric study of road-lighting white light-emitting diodes (WLEDs) integrated with semiconductor colloidal quantum dots (QDs) is reported enabling higher luminance than conventional light sources, ...
    • Generating time-varying road network data using sparse trajectories 

      Eser, Elif; Kocayusufoğlu, F.; Eravci, Bahaedd; Ferhatosmanoglu, Hakan; Larriba-Pey, J. L. (IEEE, 2016-12)
      While research on time-varying graphs has attracted recent attention, the research community has limited or no access to real datasets to develop effective algorithms and systems. Using noisy and sparse GPS traces from ...
    • A GIS ‐ based framework for hazardous materials transport risk assessment 

      Verter, V.; Kara, B. Y. (Wiley-Blackwell Publishing, 2001)
      This article presents a methodology for assessment of the hazardous materials transport risk in a multicommodity, multiple origin – destination setting. The proposed risk assessment methodology was integrated with a ...
    • Göklerdeki istikbal: Sivil Havacılık Genel Müdürlüğü 

      Sülün, Ayşe Aybüke; Bümen, Ebubekir; Çelik, Fatma Selen; Atlı, Gülnur; Yılmaz, Nida Nur (Bilkent University, 2020)
      1912 yılında başlayan ilk havacılık çalışmaları, Mustafa Kemal Atatürk'ün "İstikbal Göklerdedir!" sözünü temel alarak 1925 yılında ilk olarak Türk Tayyare Cemiyeti adı altında başlamıştır ve daha sonra Türk Hava Kurumu ...
    • Integration of shipment scheduling decisions for forward and reverse channels in a recoverable item system 

      Toptal, A. (Elsevier, 2012-11)
      In this paper, we consider the problem of finding the economic shipment quantities of failed and recovered items between a central depot and a collection center to coordinate the flow in both ways. Our model takes an ...
    • Optimization of transportation requirements in the deployment of military units 

      Akgün, İbrahim (Bilkent University, 2005)
      We study the deployment planning problem (DPP) that may roughly be defined as the problem of the planning of the physical movement of military units, stationed at geographically dispersed locations, from their home ...
    • Optimization of transportation requirements in the deployment of military units 

      Akgün, İ.; Tansel, B. Ç. (Elsevier, 2007)
      We study the deployment planning problem (DPP) that may roughly be defined as the problem of the planning of the physical movement of military units, stationed at geographically dispersed locations, from their home bases ...
    • A path-based approach for hazmat transport network design 

      Verter V.; Kara, B. Y. (Institute for Operations Research and the Management Sciences (I N F O R M S), 2008)
      The people living and working around the roads used for hazardous material (hazmat) shipments face the risk of suffering undesirable consequences of an accident. The main responsibility to mitigate the hazmat transport ...
    • Planning considerations for underground train stations 

      Altay, Yunus (Bilkent University, 1997)
      The basic design considerations of an underground train station are tried to be defined and examined in this study. The issues covered are, basically, the circulation and spatial orientation, satisfaction of psychological ...
    • RailwayDB: adaptive storage of interaction graphs 

      Soulé R.; Gedik, B. (Association for Computing Machinery, 2016)
      We are living in an ever more connected world, where data recording the interactions between people, software systems, and the physical world is becoming increasingly prevalent. These data often take the form of a temporally ...
    • Replenishment decisions under an all-units discount schedule and stepwise freight costs 

      Toptal, A. (Elsevier, 2009)
      In this study, we analyze the replenishment decisions under a general replenishment cost structure that includes stepwise freight costs and all-units quantity discounts. We first formulate a general model that accounts for ...
    • Retail location competition under carbon penalty 

      Dilek, Hande (Bilkent University, 2016-03)
      This thesis examines the retail location problem on a Hotelling line in two di erent settings: a decentralized system in which two competing retailers simultaneously choose the locations of their own stores, and a ...