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Browsing by Author "Correa Espinal, Alexander Alberto"

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    Aplicación de la teoría de grafos en la solución de problemas con impacto ambiental
    (Área Metropolitana del Valle de Aburrá, 2011) Correa Espinal, Alexander Alberto; Cogollo Flórez, Juan Miguel; Salazar López, Juan Carlos
    Introduction. An aspect that is emerging in the commercial distribution systems is the reduction of environmental impacts, by finding the best routes for the vehicles to take and aiming to reduce time or distance and, thus, fuel consumption. The graph theory is an important tool to solve routing problems for vehicles with a restricted capacity (Capacitated Vehicle Routing Problem, CVRP). Objective. To apply an informatics tool based on the graph theory to analyze and solve a CVRP in a national cargo transportation company. Materials and methods. A 13 vehicles fleet with the same technical specifications and load capacity (15 tons) were analyzed. The c hosen departure place was Medellín and its surrounding towns. Destinations were concentrated in four cities: Cartagena, Bogotá, Buenaventura and Cúcuta. Results. Two optimal routes were found: The first one is covered by a vehicle with a distance of 2347 Km. The second is covered by a vehicle with a distance of 1761 Km. Conclusions. A 21.9% saving in fuel consumption can be achieved because the routes can be covered by the use of 2 vehicles or less. It is necessary to complement the theoretical solution obtained with an adequate route planning in order to avoid moving empty vehicles.
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    Evaluación del efecto de la conducción eficiente en el consumo de combustible en vehículos de transporte de carga pesada usando diseño de experimentos
    (Corporación Universitaria Lasallista, 2010) Correa Espinal, Alexander Alberto; Cogollo Flórez, Juan Miguel; Salazar López, Juan Carlos
    Introduction. Efficient driving is a technique that contributes to the reduction of fuel consumption and emissions to the environment, and also increasing safety. It is necessary to evaluate and quantify the contributions of such technique on fuel consumption for heavy load vehicles. Objectve. To evaluate some of the factors of driving heavy load vehicles that can affect fuel consumption in orer to identify them and define actions that help in the search for savings in such a consumption. Materials and Methods. The experimental unit was a round trip Medellín-Cartagena-Medellín, with a total distance of 1,310 km in a Kenworth T800 truck that has a load capacity of 35 tons. A 23 factorial design with two replicas was used and the data obtained were analyzed with a Statgraphics Plus © 5.0 software. Results. Minimum, Cruise and Last Gear were identified as significant factors and their optimal levels were determined in the conditions under which the experiment was made, achieving a 22,5% increment in the performance of the fuel if the vehicle.
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    Mejoramiento de la recepción en una empresa de colchones utilizando simulación y diseño de experimentos
    (Corporación Universitaria Lasallista, 2011) Gómez Montoya, Rodrigo Andrés; Correa Espinal, Alexander Alberto
    La operación de recepción tiene impacto en la productividad y satisfacción de los clientes, de allí la necesidad de su adecuado funcionamiento. Objetivo. Presentar el estado del arte y desarrollar una propuesta de implementación de un modelo de simulación discreta y diseño experimental para el mejoramiento de la operación de recepción en la gestión del almacén de producto terminado, incluyendo la elaboración de un caso de aplicación en una empresa mediana de colchones en la ciudad de Medellín. Materiales y Métodos. Se desarrolla un enfoque metodológico para el uso de la simulación discreta y el diseño experimental en la operación de recepción, lo cual, contribuye al estado del arte. Resultados. De la metodología y el caso de aplicación empresarial realizado, se identificó y verificó la capacidad de estas herramientas para mejorar la operación de recepción, ya que se disminuyó su tiempo promedio total de 30 a 5 minutos, y se mejoró la eficiencia en el modelamiento debido a que el diseño experimental permitió enfocarse en los factores que afectaban la variable de interés.
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    Mejoramiento del cargue en el despacho de un centro de distribución utilizando superficies de respuesta
    (Corporación Universitaria Lasallista, 2012) Gómez Montoya, Rodrigo Andrés; Correa Espinal, Alexander Alberto
    Introduction. Loading in dispatching operations is a critical process to make the deliveries efficiently and to contribute to the satisfaction of the clients´ needs. Objective. To use the technique of experimental design optimization called response surface methodology, in order to reduce the time required to load in the dispatching operation, thus contributing to make the Distribution Center (CEDI) more efficient. Materials and methods. A four stages methodology focus is used, including aspects such as description of the company, the logistics system, the CEDI and the adaptation of the response surfaces methodology, supported by the use of the Minitab 15® statistical software in the dispatching operation. Results. A methodology based on that of the response surface is obtained, not only contributing to the state of the art through the improvement of CEDI, but also creating a tool applicable in companies because in the case developed in a meat production company, it reduced the time from 10 to 6.5 minutes, approximately, guaranteeing optimal working conditions.
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    Transporte verde: eficiencia y reducción de CO 2 integrando gestión, tecnologías de información y comunicaciones (TIC) y un metaheurístico
    (Corporación Universitaria Lasallista, 2015-07) Gómez Montoya, Rodrigo Andrés; Correa Espinal, Alexander Alberto; Hernández Vahos, José Daniel
    Introduction. Transportation represents a ratio between 30 % and 70 % of total logistic costs, plus a direct impact on client´s satisfaction. It is also a considerable source of CO 2 emissions, thus affecting the environment. Objective. Design and validate a model for green transportation management, increasing the process´ efficiency, reducing CO2 emissions and implementing environmentally friendly green practices in this logistic process. materials and methods. The Green transportation model integrates a management component (objectives, strategy and characterization), information and communication technologies (ICT) and a mathematical modeling of the routing problem that considers a fleet of heterogeneous trucks, solved by the use of a metaheuristic. Results. In the validation in a meat company the solution to the routing problem was achieved by means of a genetic algorithm, through which the process´ efficiency increased up to a ratio between 9,89 and 12, 86 %, reducing transportation time in the routes in 4410 minutes a month if compared to the routing rule the company had before. With a green model, a reduction of 2791 kg of CO 2, equivalent to 11,70 % of the current emissions generated by transportation there, was achieved. This way, we can have a quantitative assessment of the contribution the green transportation management model makes to this research area, to the efficiency of the process and to environmentally friendly practices.