Transportation

Rapid prototyping of parallel primal heuristics for domain specific MIPs: Application to maritime inventory routing

  • Shabbir Ahmed
  • Lluís-Miquel Munguía
  • George L. Nemhauser
  • Dimitri J. Papageorgiou
  • David A. Bader
  • Yufen Shao
    • Categories (Mixed) Integer Linear Programming, Parallel Algorithms, Transportation

    Parallel Alternating Criteria Search (PACS) relies on the combination of computer parallelism and Large Neighborhood Searches to attempt to deliver high quality solutions to any generic Mixed-Integer Program (MIP) quickly. While general-purpose primal heuristics are widely used due to their universal application, they are usually outperformed by domain-specific heuristics when optimizing a particular problem class. … Read more

    Optimizing Package Express Operations in China

  • Martin Savelsbergh
  • Barış Yıldız
    • Categories Airline Optimization, Combinatorial Optimization, Transportation Tags , , ,

    We explore optimization models to support the planning and operations functions at package express carriers in China. The models simultaneously consider ground and air transportation, company-owned and purchased capacity, multiple service products, and shipments becoming available throughout the day. An extensive computational study using real-life data shows the efficacy of the models, provides insights into … Read more

    An Iterative Re-optimization Framework for the Dynamic Vehicle Routing Problem with Roaming Delivery Locations

  • Gizem Ozbaygin
  • Martin Savelsbergh
    • Categories Network Optimization, Transportation Tags , , ,

    Branch-and-price has established itself as an effective solution methodology for a wide variety of planning problems. We investigate its potential as a solution method- ology for solving operational problems. Specifically, we explore its potential in the context of a dynamic variant of the vehicle routing problem with roaming delivery locations, in which customer itineraries may … Read more

    The Distributionally Robust Chance Constrained Vehicle Routing Problem

  • Shubhechyya Ghosal
  • Wolfram Wiesemann
    • Categories Robust Optimization, Stochastic Programming, Transportation Tags , ,

    We study a variant of the capacitated vehicle routing problem (CVRP), which asks for the cost-optimal delivery of a single product to geographically dispersed customers through a fleet of capacity-constrained vehicles. Contrary to the classical CVRP, which assumes that the customer demands are deterministic, we model the demands as a random vector whose distribution is … Read more

    A new drayage problem with different customer services and container requirements

  • Federica Bomboi
  • Jonas Prünte
    • Categories Transportation Tags , , ,

    This paper investigates a drayage problem generalizing a previously proposed, which is motivated by a case study of a real maritime carrier. To serve export and import customer requests in the hinterland of a port, a fleet of trucks able to carry one or two containers of the same size is adopted. The aim of … Read more

    Probabilistic Envelope Constrained Multiperiod Stochastic Emergency Medical Services Location Model and Decomposition Scheme

  • Erick Delage
  • Jinlin Li
  • Chun Peng
    • Categories Production and Logistics, Stochastic Programming, Transportation Tags , , , , ,

    This paper considers a multiperiod Emergency Medical Services (EMS) location problem and introduces two two-stage stochastic programming formulations that account for uncertainty about emergency demand. While the first model considers both a constraint on the probability of covering the realized emergency demand and minimizing the expected cost of doing so, the second one employs probabilistic … Read more

    Seamless Multimodal Transportation Scheduling

  • David Bergman
  • John Hooker
  • Arvind U. Raghunathan
  • Thiago Serra
  • Shingo Kobori
    • Categories Applications - OR and Management Sciences, Scheduling, Transportation

    Ride-hailing services have expanded the role of shared mobility in passenger transportation systems, creating new markets and creative planning solutions for major urban centers. In this paper, we consider their use for last-mile passenger transportation in coordination with a mass transit service to provide a seamless multimodal transportation experience for the user. A system that … Read more

    Model and exact solution for a two-echelon inventory routing problem

  • Katyanne Farias
  • Khaled Hadj-Hamou
  • Claude Yugma
    • Categories Branch and Cut Algorithms, Supply Chain Management, Transportation Tags , , ,

    The classic version of the Inventory Routing Problem considers a system with one supplier that manages the stock level of a set of customers. The supplier defines when and how much products to supply and how to combine customers in routes while minimizing storage and transportation costs. We present a new version of this problem … Read more

    Resilience assessment for interdependent urban infrastructure systems using dynamic network flow models

  • Panagiotis Angeloudis
  • Nils Goldbeck
  • Washington Ochieng
    • Categories Civil and Environmental Engineering, Optimization of Simulated Systems, Transportation

    Critical infrastructure systems in cities are becoming increasingly interdependent, therefore exacerbating the impacts of disruptive events through cascading failures, hindered asset repairs and network congestion. Current resilience assessment methods fall short of fully capturing such interdependency effects as they tend to model asset reliability and network flows separately and often rely on static flow assignment … Read more

    Assessment of systemic vulnerabilities in container shipping networks with consideration of transhipment

  • Pablo E. Achurra-Gonzalez
  • Panagiotis Angeloudis
  • Nils Goldbeck
  • Daniel J. Graham
  • Marc Stettler
  • Konstantinos Zavitsas
    • Categories Game Theory, Supply Chain Management, Transportation

    The global container shipping network is vital to international trade. Current techniques for its vulnerability assessment are constrained due to the lack of historical disruption data and computational limitations due to typical network sizes. We address these modelling challenges by developing a new framework, composed by game-theoretic attacker-defender model and a cost-based container assignment model … Read more