Yu Zhang

The Service-Centric Vehicle Routing Problem with Crowdshipping

  • Bingjie Zhou
  • Yu Zhang
  • Roberto Baldacci
    • Categories Transportation

    Last-mile delivery services worldwide have embraced crowdshipping, which involves both regular and occasional drivers to reduce transportation costs and potentially ensure timely deliveries. However, real-world uncertainty in travel times leads to delays in deliveries. Motivated by empirical studies on customer impatience with late deliveries, this paper focuses on a service-centric Vehicle Routing Problem with Crowdshipping … Read more

    Effective Exact Solution Framework for Routing Optimization with Time Windows and Travel Time Uncertainty

  • Zhenzhen Zhang
  • Yu Zhang
  • Roberto Baldacci
    • Categories Robust Optimization, Stochastic Programming, Transportation Tags , , , ,

    We consider a vehicle routing problem with time windows under uncertain travel times where the goal is to determine routes for a fleet of homogeneous vehicles to arrive at the locations of customers within their stipulated time windows to the maximum extent, while ensuring that the total travel cost does not exceed a prescribed budget. … Read more

    Robust Data-Driven Vehicle Routing with Time Windows

  • Andrew Lim
  • Melvyn Sim
  • Zhenzhen Zhang
  • Yu Zhang
    • Categories Robust Optimization, Stochastic Programming, Transportation Tags , ,

    Optimal routing solutions based on deterministic models usually fail to deliver promised on-time services in an uncertain real world, which can lead to the loss of customers and revenue. We study a vehicle routing problem with time windows (VRPTW) toward the end of mitigating the risk of late customer arrivals as much as possible when … Read more