Transportation

The Robust Bike Sharing Rebalancing Problem: Formulations and a Branch-and-Cut Algorithm

  • Bruno Petrato Bruck
  • Walton P. Coutinho
  • Pedro Munari
    • Categories Branch and Cut Algorithms, Robust Optimization, Transportation Tags , , ,

    Bike Sharing Systems (BSSs) offer a sustainable and efficient urban transportation solution, bringing flexible and eco-friendly alternatives to city logistics. During their operation, BSSs may suffer from unbalanced bike distribution among stations, requiring rebalancing operations throughout the system. The inherent uncertain demand at the stations further complicates these rebalancing operations, even when performed during downtime. … Read more

    Data-driven Stochastic Vehicle Routing Problems with Deadlines

  • Shanshan Wang
  • Erick Delage
  • Leandro Coelho
    • Categories Applications - OR and Management Sciences, Transportation Tags , , , , ,

    Vehicle routing problems (VRPs) with deadlines have received significant attention around the world. Motivated by a real-world food delivery problem, we assume that the travel time depends on the routing decisions, and study a data-driven stochastic VRP with deadlines and endogenous uncertainty. We use the non-parametric approaches, including k-nearest neighbor (kNN) and kernel density estimation … Read more

    Optimizing the Path Towards Plastic-Free Oceans

  • Dick den Hertog
  • Jean Pauphilet
  • Yannick Pham
  • Bruno Sainte-Rose
  • Baizhi Song
    • Categories Applications - OR and Management Sciences, Dynamic Programming, Transportation Tags , , ,

    Increasing ocean plastic pollution is irreversibly harming ecosystems and human economic activities. We partner with a non-profit organization and use optimization to help clean up oceans from plastic faster. Specifically, we optimize the route of their plastic collection system in the ocean to maximize the quantity of plastic collected over time. We formulate the problem … Read more

    DeLuxing: Deep Lagrangian Underestimate Fixing for Column-Generation-Based Exact Methods

  • Yu Yang
    • Categories Branch and Cut Algorithms, Integer Programming, Transportation

    In this paper, we propose an innovative variable fixing strategy called deep Lagrangian underestimate fixing (DeLuxing). It is a highly effective approach for removing unnecessary variables in column-generation (CG)-based exact methods used to solve challenging discrete optimization problems commonly encountered in various industries, including vehicle routing problems (VRPs). DeLuxing employs a novel linear programming (LP) … Read more

    Optimal Multi-Agent Pickup and Delivery Using Branch-and-Cut-and-Price

  • Edward Lam
    • Categories Branch and Cut Algorithms, Integer Programming, Transportation

    Given a set of agents and a set of pickup-delivery requests located on a two-dimensional map, the Multi-Agent Pickup and Delivery problem assigns the requests to the agents such that every agent moves from its start location to the locations of its assigned requests and finally to its end location without colliding into any other … Read more

    Delay-Resistant Robust Vehicle Routing with Heterogeneous Time Windows

  • Lukas Schürmann
  • Tim Niemann
  • Petra Mutzel
  • Andreas M. Tillmann
  • Sebastian Stiller
    • Categories Combinatorial Optimization, Integer Programming, Transportation Tags , , ,

    We consider a robust variant of the vehicle routing problem with heterogeneous time windows (RVRP-HTW) with a focus on delay-resistant solutions. Here, customers have different availability time windows for every vehicle and must be provided with a preferably tight appointment window for the planned service. Different vehicles are a possibility to model different days on … Read more

    Planning a Zero-Emission Mixed-Fleet Public Bus System with Minimal Life Cycle Cost

  • Nathalie Frieß
  • Ulrich Pferschy
    • Categories Applications - OR and Management Sciences, Transportation Tags , , , , ,

    The variety of available technology options for the operation of zero-emission bus systems gives rise to the problem of finding an optimal technology decision for bus operators. Among others, overnight charging, opportunity charging and hydrogen-based technology options are frequently pursued technological solutions. As their operating conditions are strongly influenced by the urban context, an optimal … Read more

    Inverse Optimization for Routing Problems

  • Pedro Zattoni Scroccaro
  • Peyman Mohajerin Esfahani
  • Bilge Atasoy
    • Categories Applications - OR and Management Sciences, Convex and Nonsmooth Optimization, Transportation

    We propose a method for learning decision-makers’ behavior in routing problems using Inverse Optimization (IO). The IO framework falls into the supervised learning category and builds on the premise that the target behavior is an optimizer of an unknown cost function. This cost function is to be learned through historical data, and in the context … Read more

    Robust Workforce Management with Crowdsourced Delivery

  • Chun Cheng
  • Melvyn Sim
  • Yue Zhao
    • Categories Robust Optimization, Transportation Tags , , ,

    We investigate how crowdsourced delivery platforms with both contracted and ad-hoc couriers can effectively manage their workforce to meet delivery demands amidst uncertainties. Our objective is to minimize the hiring costs of contracted couriers and the crowdsourcing costs of ad-hoc couriers while considering the uncertain availability and behavior of the latter. Due to the complication … Read more

    Optimization-based Learning for Dynamic Load Planning in Trucking Service Networks

  • Ritesh Ojha
  • Reem Khir
  • Alan L. Erera
    • Categories (Mixed) Integer Linear Programming, Production and Logistics, Transportation Tags , ,

    Citation Ojha, R., Chen, W., Zhang, H., Khir, R., Erera, A. & Van Hentenryck, P. (2023). Optimization-based Learning for Dynamic Load Planning in Trucking Service Networks. Article Download View Optimization-based Learning for Dynamic Load Planning in Trucking Service Networks