10:30 AM - 10:55 AM
GRASP with Advanced Starting Point for the VRP with Route Balancing
We propose a variant of GRASP (Greedy Randomized Adaptive Search procedure) to solve a bi-objective extension of VRP known as VRPRB – Vehicle Routing Problem with Route Balancing. Computational results will be presented.
10:55 AM - 11:20 AM
The Quadratic Capacitated Vehicle Routing Problem
We introduce the Quadratic Capacitated Vehicle Routing Problem, a problem which arises in practical applications in logistics and transportation. It generalizes the Capacitated Vehicle Routing Problem and the Quadratic Traveling Salesman Problem. We present a formulation and strengthen it with several valid inequalities. We show results for a branch-and-cut algorithm.
11:20 AM - 11:45 AM
Maritime Fleet Deployment with Voyage Separation Requirements
We present a maritime fleet deployment problem in which voyages for the same trade route must be somewhat evenly spread in time. To solve the problem we propose a branch-and-price algorithm, which has been tested on real life instances from a Norwegian bulk shipping company.
11:45 AM - 12:10 PM
Unified Metaheuristics and Large Neighborhoods for Multi-Attribute VRPs
A recently-proposed unified metaheuristic framework for VRPs, based on attribute-dependent assignment, sequencing and route-evaluation components, is described. We further introduce new route evaluations inspired from bi-directional dynamic programming to explore large neighborhoods with combined assignment and sequencing changes, for VRPs with multiple depots, fleet mix, and prize collection.