Applications – OR and Management Sciences

Robust Service Network Design under Travel Time Uncertainty: Formulations and Exact Solutions

  • Shengnan Shu
  • Zhou Xu
  • Jin Qi
    • Categories Applications - OR and Management Sciences, Network Optimization, Robust Optimization Tags , , , , , ,

    We study the continuous-time service network design problem (CTSNDP) under travel time uncertainty, aiming to design a transportation service network along a continuous-time planning horizon, with robust operational efficiency even in the presence of travel time deviations. Incorporating travel time uncertainty holds a great practical value. However, it poses a significant challenge in both problem … Read more

    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

    DC programming approach for solving a class of bilevel partial facility interdiction problems

  • Pham Thi Hoai
    • Categories (Mixed) Integer Linear Programming, Applications - OR and Management Sciences, Constrained Nonlinear Optimization, Nonlinear Optimization, Nonsmooth Optimization Tags

    We propose a new approach based DC programming for fnding a solution of the partial facility interdiction problem that belongs to the class of bilevel programming. This model was frst considered in the work of Aksen et al. [1] with a heuristic algorithm named multi-start simplex search (MSS). However, because of the big number of … Read more

    Trajectory Optimization of Unmanned Aerial Vehicles in the Electromagnetic Environment

  • Alain Zemkoho
  • Jörg Fliege
    • Categories Control Applications, Nonlinear Optimization, Telecommunications

    We consider a type of routing problems common in defence and security, in which we control a fleet of unmanned aerial vehicles (UAVs) that have to reach one or more target locations without being detected by an adversary. Detection can be carried out by a variety of sensors (radio receivers, cameras, personnel, etc) placed by … 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

    Sequential Pricing of Electricity

  • Jacob Mays
    • Categories Applications - OR and Management Sciences, Energy, Finance and Economics Tags , , ,

    This paper investigates the design and analysis of price formation in wholesale electricity markets given variability, uncertainty, non-convexity, and intertemporal operating constraints. The paper’s primary goal is to develop a framework to assess the many resource participation models, reserve product definitions, and enhanced pricing methods that have arisen in U.S. systems, especially in the context … Read more

    An enhanced mathematical model for optimal simultaneous preventive maintenance scheduling and workshop planning

  • Gabrijela Obradović
  • Ann-Brith Strömberg
    • Categories (Mixed) Integer Linear Programming, Multi-Criteria Optimization, Scheduling

    For a system to stay operational, maintenance of its components is required and to maximize the operational readiness of a system, preventive maintenance planning is essential. There are two stakeholders—a system operator and a maintenance workshop—and a contract regulating their joint activities. Each contract leads to a bi-objective optimization problem. Components that require maintenance are … Read more

    Healthcare Operations Research and Management under Pandemics: a Review

  • Majid Salavati-Khoshghalb
    • Categories Applications - OR and Management Sciences Tags , , , , , ,

    This literature review sought to identify the role of Operations Research and Management (OR-and-OM) in the Healthcare Systems (HS) decision/policy making processes that have undergone a remarkable transformation when faced with pandemics, especially during the COVID-19 era. In this study, we investigate OR models and OM techniques that facilitate clinical decision-making with short- and long-term … Read more

    Resilient Relay Logistics Network Design: A k-Shortest Path Approach

  • Onkar Anand Kulkarni
  • Mathieu Dahan
    • Categories (Mixed) Integer Linear Programming, Facility Planning and Design, Production and Logistics Tags , , , ,

    Problem definition: We study the problem of designing large-scale resilient relay logistics hub networks. We propose a model of k-Shortest Path Network Design, which aims to improve a network’s efficiency and resilience through its topological configuration, by locating relay logistics hubs to connect each origin-destination pair with k paths of minimum lengths, weighted by their … Read more