Transportation

Lead-Time-Constrained Middle-Mile Consolidation Network Design with Fixed Origins and Destinations

  • Lacy M. Greening
  • Mathieu Dahan
  • Alan L. Erera
    • Categories Applications - OR and Management Sciences, Transportation Tags , , ,

    Many large e-commerce retailers move sufficient freight volumes to operate private middle-mile consolidation networks for order fulfillment, transporting customer shipments from stocking locations to last-mile delivery partners in consolidated loads to reduce freight costs. We study a middle-mile network design optimization problem with fixed origins and destinations to build load consolidation plans that minimize cost … Read more

    An integrated vertiport placement model considering vehicle sizing and queuing

  • Cark Khalife
  • Joseph Slim
  • Jose Javier Escribano Macias
  • Panagiotis Angeloudis
    • Categories Transportation Tags , , ,

    The increasing levels of congestion and infrastructure costs in cities have created a need for more intelligent transport systems. Urban Air Mobility (UAM) offers a solution by introducing intra-urban aerial transport to overcome the existing congested infrastructure. The performance of UAM systems are highly dependent on vertiport locations, vehicle sizing and infrastructure specifications. This study … Read more

    Optimisation of Step-free access Infrastructure in London Underground considering Borough Economic Inequality

  • Eduardo Candela
  • Jose Javier Escribano Macias
  • He-in Cheong
  • Petrina Constantinou
  • Arnab Majumdar
  • Panagiotis Angeloudis
    • Categories Applications - OR and Management Sciences, Multi-Criteria Optimization, Transportation Tags , , , ,

    Public transport is the enabler of social and economic development, as it allows the movement of people and provides access to opportunities that otherwise might have been unattainable. Access to public transport is a key aspect of social equity, with step-free access improving the inclusivity of the transport network in particular for mobility impaired population … Read more

    Demand modelling and optimal vertiport placement for airport-purposed eVTOL services

  • Karim Serhal
  • Jose Javier Escribano Macias
  • Panagiotis Angeloudis
    • Categories Transportation Tags , , , ,

    Recent technological advances have only recently made Urban Air Mobility feasible as a realistic alternative to existing transport modes. Despite the growing interest, this disruptive service requires accurate strategic investments to ensure its viability in the short- and long-term. While airports have been identified as potential sites for vertiports, extending operations to the urban rest … Read more

    Approximate Dynamic Programming for Crowd-shipping with In-store Customers

  • Kianoush Mousavi
  • Merve Bodur
  • Mucahit Cevik
  • Matthew J. Roorda
    • Categories Civil and Environmental Engineering, Dynamic Programming, Transportation Tags , , , ,

    Crowd-shipping has gained significant attention as a last-mile delivery option over the recent years. In this study, we propose a variant of dynamic crowd-shipping model with in-store customers as crowd-shippers to deliver online orders within few hours. We formulate the problem as a Markov decision process and develop an approximate dynamic programming (ADP) policy using … Read more

    A decomposition approach for integrated locomotive scheduling and driver rostering in rail freight transport

  • Andreas Bärmann
  • Alexander Martin
  • Jonasz Staszek
    • Categories 0-1 Programming, Cutting Plane Approaches, Transportation Tags , , , ,

    In this work, we consider the integrated problem of locomotive scheduling and driver rostering in rail freight companies. Our aim is to compute an optimal simultaneous assignment of locomotives and drivers to the trains listed in a given order book. Mathematically, this leads to the combination of a set-packing problem with compatibility constraints and a … Read more

    Determining locations and layouts for parcel lockers to support supply chain viability at the last mile

  • Michael Kahr
    • Categories (Mixed) Integer Linear Programming, Facility Planning and Design, Transportation Tags , , , ,

    The pandemic caused by the corona virus SARS-CoV-2 raised many new challenges for humanity. For instance, governments imposed regulations such as lockdowns, resulting in supply chain shocks at different tiers. Additionally, delivery services reached their capacity limits because the demand for mail orders soared temporarily during the lockdowns. We argue that one option to support … Read more

    MILP models for the continuous Berth Allocation and Quay Crane Assignment Problem considering crane movement and setup times

  • Ramon Alvarez-Valdes
  • Juan F. Correcher
  • Federico Perea
    • Categories (Mixed) Integer Linear Programming, Scheduling, Transportation Tags , , ,

    In this technical report we present several Mixed Integer Linear Programming (MILP) models for the Berth Allocation and Quay Crane Assignment Problem (BACASP) considering crane movement and setup time (from now on: BACASP-S). First, we propose a MILP for the continuous-quay time-invariant BACASP in which both berthing time and position variables are continuous. Then, we … Read more

    Scenario Consensus Algorithms for Solving Stochastic and Dynamic Problems

  • Felipe Lagos
    • Categories Stochastic Programming, Transportation Tags , , ,

    In transportation problems and in many other planning problems, there are important sources of uncertainty that must be addressed to find effective and efficient solutions. A common approach for solving these dynamic and stochastic problems is the Multiple Scenario Approach (MSA), that has been proved effective for transportation problems, but it does not provide flexibility … Read more

    A two-objective optimization of ship itineraries for a cruise company

  • Gianni Di Pillo
  • Marcello Fabiano
  • Stefano Lucidi
  • Massimo Roma
    • Categories Applications - OR and Management Sciences, Transportation

    This paper deals with the problem of cruise itinerary planning which plays a central role in worldwide cruise ship tourism. In particular, the Day-by-day Cruise Itinerary Optimization (DCIO) problem is considered. Assuming that a cruise has been planned in terms of homeports and journey duration, the DCIO problem consist in determining the daily schedule of … Read more