6 research outputs found

    Vehicle routing problem with limited refueling halts using particle swarm optimization with greedy mutation operator

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    Route planning and goods distribution are a major component of any logistics. Vehicle Routing Problem is a class of problems addressing the issues of logistics. Vehicle Routing Problem with Limited Refueling Halts is introduced in this paper. The objective is to plan a route with an emphasis on the time and cost involved in refueling vehicles. The method is tailored to find optimal routes with minimal halts at the refueling stations. The problem is modeled as a bi objective optimization problem and is solved using particle swarm optimization. A new mutation operator called greedy mutation operator is introduced. Experiments are conducted with available data sets and MATLABR2011a is used for implementation

    Planeaci贸n de rutas de distribuci贸n 贸ptimas con abastecimiento de combustible

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    133 p谩ginas. Maestr铆a en optimizaci贸n.El problema de ruteo de veh铆culos es un problema central en la distribuci贸n de bienes, en donde se tiene un conjunto de solicitudes de clientes geogr谩ficamente dispersos y se dispone de una flota de veh铆culos de capacidad limitada que se encuentra estacionada inicialmente en un centro de distribuci贸n. El objetivo es asignar solicitudes a veh铆culos y calcular sus itinerarios, para que el costo total de distribuci贸n sea m铆nimo y la ejecuci贸n del plan sea factible. En esta tesis presentamos un problema multiobjetivo nuevo en la literatura, en el que adem谩s de considerar el gasto y el reabastecimiento de combustible durante los recorridos, se busca minimizar tanto la distancia total recorrida por los veh铆culos (proporcional al combustible consumido por los mismos), como el tiempo total de recorrido (considerando la existencia de tiempos de espera variables en las distintas gasolineras) y tambi茅n el costo monetario derivado de la compra del combustible (considerando la variaci贸n del precio de la gasolina en las distintas gasolineras). Formulamos este problema con un modelo de programaci贸n entera mixta para resolver un conjunto de instancias realistas mediante el solucionador lineal Gurobi. Posteriormente presentamos adaptaciones novedosas de heur铆sticas cl谩sicas del problema de ruteo, con las que calculamos soluciones iniciales factibles para acelerar el proceso de resoluci贸n del modelo. El solucionador lineal tambi茅n es asistido por un algoritmo de b煤squeda local para intentar mejorar las soluciones obtenidas durante el proceso de optimizaci贸n

    3D-in-2D Displays for ATC.

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    This paper reports on the efforts and accomplishments of the 3D-in-2D Displays for ATC project at the end of Year 1. We describe the invention of 10 novel 3D/2D visualisations that were mostly implemented in the Augmented Reality ARToolkit. These prototype implementations of visualisation and interaction elements can be viewed on the accompanying video. We have identified six candidate design concepts which we will further research and develop. These designs correspond with the early feasibility studies stage of maturity as defined by the NASA Technology Readiness Level framework. We developed the Combination Display Framework from a review of the literature, and used it for analysing display designs in terms of display technique used and how they are combined. The insights we gained from this framework then guided our inventions and the human-centered innovation process we use to iteratively invent. Our designs are based on an understanding of user work practices. We also developed a simple ATC simulator that we used for rapid experimentation and evaluation of design ideas. We expect that if this project continues, the effort in Year 2 and 3 will be focus on maturing the concepts and employment in a operational laboratory settings

    Safety and Reliability - Safe Societies in a Changing World

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    The contributions cover a wide range of methodologies and application areas for safety and reliability that contribute to safe societies in a changing world. These methodologies and applications include: - foundations of risk and reliability assessment and management - mathematical methods in reliability and safety - risk assessment - risk management - system reliability - uncertainty analysis - digitalization and big data - prognostics and system health management - occupational safety - accident and incident modeling - maintenance modeling and applications - simulation for safety and reliability analysis - dynamic risk and barrier management - organizational factors and safety culture - human factors and human reliability - resilience engineering - structural reliability - natural hazards - security - economic analysis in risk managemen
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