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Composite Variable Formulations for Express Shipment Service Network Design

Author

Listed:
  • Andrew P. Armacost

    (Department of Management, United States Air Force Academy, Colorado Springs, Colorado 80840)

  • Cynthia Barnhart

    (Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139)

  • Keith A. Ware

    (Operations Research Group, United Parcel Service, Louisville, Kentucky 40223)

Abstract

In this paper we describe a new approach to solving the express shipment service network design problem. Conventional polyhedral methods for network design and network loading problems do not consistently solve instances of the planning problem we consider. Under a restricted version of the problem, we transform conventional formulations to a new formulation using what we term composite variables . By removing flow decisions as explicit decisions, this extended formulation is cast purely in terms of the design elements. We establish that its linear programming relaxation gives stronger lower bounds than conventional approaches. We apply this composite variable formulation approach to the UPS Next Day Air delivery network and demonstrate potential annual cost savings in the hundreds of millions of dollars.

Suggested Citation

  • Andrew P. Armacost & Cynthia Barnhart & Keith A. Ware, 2002. "Composite Variable Formulations for Express Shipment Service Network Design," Transportation Science, INFORMS, vol. 36(1), pages 1-20, February.
    • Handle: RePEc:inm:ortrsc:v:36:y:2002:i:1:p:1-20
    DOI: 10.1287/trsc.36.1.1.571
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    References listed on IDEAS

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