El objetivo de este trabajo es establecer que factores son críticos para el diseño espacial de ce... more El objetivo de este trabajo es establecer que factores son críticos para el diseño espacial de centros de distribución (DC), especialmente naves de almacenamiento inmóticas. Para esto, se utilizaron los principios de la metodología general ajustada (MGA) y el diseño de experimentos (DOE) en el contexto de una empresa de griferías en Bogotá, Colombia. Dicha metodología se basa en la aplicación de la MGA para proyectos inmobiliarios industriales, en un marco de redes de suministro. Adicionalmente, el diseño de experimentos (DOE) se empleó como forma de obtener la alternativa óptima que satisfaga las expectativas de la empresa y sus clientes desde el punto de vista económico y estadístico. En los resultados se encontró que la capacidad de almacenamiento del centro de distribución centralizado (CDC) es el factor más significativo en la etapa de diseño, con lo anterior se concluye que, esta característica de un CDC es esencial para racionalizar la inversión en capital de trabajo y maximizar los beneficios de la empresa.
Este trabajo se propone minimizar los costos de conflicto entre las normas que regulan la calidad... more Este trabajo se propone minimizar los costos de conflicto entre las normas que regulan la calidad del aire y la actividad industrial, que puede ser modelado como un problema de optimización semi-infinita. Para resolver este problema se utilizó el método estocástico de aproximaciones externas en MATLAB, junto a un parámetro de composición y dispersión de partículas, reagrupando el área de distribución de contaminación inicial en subáreas reducidas. El conjunto de fuentes de contaminación se reemplazó por fuentes virtuales para resolver convenientemente el problema original. Los experimentos numéricos permitieron construir mapas de contaminación precisos según la composición no uniforme de las partículas. Así, se encontraron buenas soluciones acorde a las normas ambientales en cada punto de las diferentes zonas.
International Journal of Physical Distribution Logistics Management, 2015
Purpose – The purpose of this paper is to propose that transportation modal mix in global supply ... more Purpose – The purpose of this paper is to propose that transportation modal mix in global supply chains is a result of the strategic alignment between industry characteristics and supply chain strategies. Design/methodology/approach – Using annual US trade statistics and manufacturing industry data for the years 2002-2009 between the USA and its top 12 Asian trading partners, this study applies various regression methods to examine key factors associated with the transport modal decision. Findings – The results show that industry characteristics have an impact on the transportation modal mix in global supply chains. Manufacturing industries use more air freight and less ocean freight when facing positive sales surprises, high-monthly demand variation, a high-contribution margin ratio, a high cost of capital, and increased competition. Practical implications – The findings provide important insights for logistics managers and freight forwarders. While transportation cost remains an important concern, a logistics manager must also consider non-cost factors such as competition, working capital, and demand uncertainties in their modal decisions. Freight forwarders should be supply chain solution providers who consider all of these industry factors and suggest a proper mix of transportation modes for their customers. Originality/value – This study is among the first efforts to examine the impact of industry characteristics on the transportation modal mix in global supply chains. This study first develops a theoretical framework for the modal choice decision for international transportation movements and then, using an extensive and innovative data set, provides new findings regarding current air freight practices in global supply chains.
Gathering indicators that can make decision making easier in relation to launching potentially in... more Gathering indicators that can make decision making easier in relation to launching potentially innovative products and opening up new markets is an important task for globally present companies. This study presents an analogy between the phenomenon of molecular diffusion and the diffusion of innovations in order to identify the dissemination index of innovations in a market, which is compared to finding the diffusivity coefficient of a substance A spreading in a liquid environment B. In this analogy, the spreading substance is a specific product and the environment for the solution is the market in different countries featuring diverse socioeconomic contexts. The analogy can also be used to explain the phenomenon of diffusion of innovations from a different perspective. This indicator can help the decision-making processes regarding the amount of investment in advertising and other expenses aimed to originate further diffusion of the innovation itself. The analogy was employed for f...
En el presente trabajo se presenta una nuevo algoritmo para encontrar la envolvente convexa C(P) ... more En el presente trabajo se presenta una nuevo algoritmo para encontrar la envolvente convexa C(P) para un conjuntos P de n puntos en R 2. Este problema ha sido ampliamente estudiado en la geometría computacional ya que tiene importante aplicaciones en la ingeniera y otros campos del conocimiento. El algoritmo propuesto se basada en búsquedas direccionales de hiperplanos soporte y una variante que incorpora hiperplanos separadores que permiten reducir el número de puntos evaluados, descartando los que son interiores. La aplicación del algoritmo propuesto se ilustra mediante un ejemplo. La complejidad del algoritmo obtenido es O(máx (nvo; nv o)), vo ≤ v ≤ n y v o ≤ v ≤ n, donde v es el número de vértices de la envolvente convexa.
This study examines the factors that impact the decision of transport modal choice in global supp... more This study examines the factors that impact the decision of transport modal choice in global supply chains. The factors affecting modal decision include: industry characteristics, modal characteristics, shipment characteristics and regional characteristics. This study proposes that the decision maker of the modal choice aims to maximize its own profit and considers revenue and cost drivers when making the modal decision. The results show that the manufacturing industries use more air shipping for both exports and imports when faced with a positive sales surprise and high demand variation. The results also indicate that more concentrated industries will use less air transport for both imports and exports. Modal decisions for exports are also impacted by the cost of capital and the gross margin ratio.
Resumen la programación de la producción en manufacturas tipo taller (job shop) encuentra muchas ... more Resumen la programación de la producción en manufacturas tipo taller (job shop) encuentra muchas aplicaciones en sistemas reales de producción, como empresas metalmecánicas, de impresión, de textiles y otras más. En general, en estos sistemas de ...
Executive Summary Flight delay is a serious and widespread problem in the United States. Increasi... more Executive Summary Flight delay is a serious and widespread problem in the United States. Increasing flight delays place a significant strain on the US air travel system and cost airlines, passengers, and society at many billions of dollars each year. While a number of previous studies have attempted to estimate the total economic impact of delays, scientific knowledge about the cost of delay is still limited. The Federal Aviation Administration sponsored the five NEXTOR universities and the Brattle Group to conduct a ...
Executive Summary Flight delay is a serious and widespread problem in the United States. Increasi... more Executive Summary Flight delay is a serious and widespread problem in the United States. Increasing flight delays place a significant strain on the US air travel system and cost airlines, passengers, and society at many billions of dollars each year. While a number of previous studies have attempted to estimate the total economic impact of delays, scientific knowledge about the cost of delay is still limited. The Federal Aviation Administration sponsored the five NEXTOR universities and the Brattle Group to conduct a ...
El objetivo de este trabajo es establecer que factores son críticos para el diseño espacial de ce... more El objetivo de este trabajo es establecer que factores son críticos para el diseño espacial de centros de distribución (DC), especialmente naves de almacenamiento inmóticas. Para esto, se utilizaron los principios de la metodología general ajustada (MGA) y el diseño de experimentos (DOE) en el contexto de una empresa de griferías en Bogotá, Colombia. Dicha metodología se basa en la aplicación de la MGA para proyectos inmobiliarios industriales, en un marco de redes de suministro. Adicionalmente, el diseño de experimentos (DOE) se empleó como forma de obtener la alternativa óptima que satisfaga las expectativas de la empresa y sus clientes desde el punto de vista económico y estadístico. En los resultados se encontró que la capacidad de almacenamiento del centro de distribución centralizado (CDC) es el factor más significativo en la etapa de diseño, con lo anterior se concluye que, esta característica de un CDC es esencial para racionalizar la inversión en capital de trabajo y maximizar los beneficios de la empresa.
Este trabajo se propone minimizar los costos de conflicto entre las normas que regulan la calidad... more Este trabajo se propone minimizar los costos de conflicto entre las normas que regulan la calidad del aire y la actividad industrial, que puede ser modelado como un problema de optimización semi-infinita. Para resolver este problema se utilizó el método estocástico de aproximaciones externas en MATLAB, junto a un parámetro de composición y dispersión de partículas, reagrupando el área de distribución de contaminación inicial en subáreas reducidas. El conjunto de fuentes de contaminación se reemplazó por fuentes virtuales para resolver convenientemente el problema original. Los experimentos numéricos permitieron construir mapas de contaminación precisos según la composición no uniforme de las partículas. Así, se encontraron buenas soluciones acorde a las normas ambientales en cada punto de las diferentes zonas.
International Journal of Physical Distribution Logistics Management, 2015
Purpose – The purpose of this paper is to propose that transportation modal mix in global supply ... more Purpose – The purpose of this paper is to propose that transportation modal mix in global supply chains is a result of the strategic alignment between industry characteristics and supply chain strategies. Design/methodology/approach – Using annual US trade statistics and manufacturing industry data for the years 2002-2009 between the USA and its top 12 Asian trading partners, this study applies various regression methods to examine key factors associated with the transport modal decision. Findings – The results show that industry characteristics have an impact on the transportation modal mix in global supply chains. Manufacturing industries use more air freight and less ocean freight when facing positive sales surprises, high-monthly demand variation, a high-contribution margin ratio, a high cost of capital, and increased competition. Practical implications – The findings provide important insights for logistics managers and freight forwarders. While transportation cost remains an important concern, a logistics manager must also consider non-cost factors such as competition, working capital, and demand uncertainties in their modal decisions. Freight forwarders should be supply chain solution providers who consider all of these industry factors and suggest a proper mix of transportation modes for their customers. Originality/value – This study is among the first efforts to examine the impact of industry characteristics on the transportation modal mix in global supply chains. This study first develops a theoretical framework for the modal choice decision for international transportation movements and then, using an extensive and innovative data set, provides new findings regarding current air freight practices in global supply chains.
Gathering indicators that can make decision making easier in relation to launching potentially in... more Gathering indicators that can make decision making easier in relation to launching potentially innovative products and opening up new markets is an important task for globally present companies. This study presents an analogy between the phenomenon of molecular diffusion and the diffusion of innovations in order to identify the dissemination index of innovations in a market, which is compared to finding the diffusivity coefficient of a substance A spreading in a liquid environment B. In this analogy, the spreading substance is a specific product and the environment for the solution is the market in different countries featuring diverse socioeconomic contexts. The analogy can also be used to explain the phenomenon of diffusion of innovations from a different perspective. This indicator can help the decision-making processes regarding the amount of investment in advertising and other expenses aimed to originate further diffusion of the innovation itself. The analogy was employed for f...
En el presente trabajo se presenta una nuevo algoritmo para encontrar la envolvente convexa C(P) ... more En el presente trabajo se presenta una nuevo algoritmo para encontrar la envolvente convexa C(P) para un conjuntos P de n puntos en R 2. Este problema ha sido ampliamente estudiado en la geometría computacional ya que tiene importante aplicaciones en la ingeniera y otros campos del conocimiento. El algoritmo propuesto se basada en búsquedas direccionales de hiperplanos soporte y una variante que incorpora hiperplanos separadores que permiten reducir el número de puntos evaluados, descartando los que son interiores. La aplicación del algoritmo propuesto se ilustra mediante un ejemplo. La complejidad del algoritmo obtenido es O(máx (nvo; nv o)), vo ≤ v ≤ n y v o ≤ v ≤ n, donde v es el número de vértices de la envolvente convexa.
This study examines the factors that impact the decision of transport modal choice in global supp... more This study examines the factors that impact the decision of transport modal choice in global supply chains. The factors affecting modal decision include: industry characteristics, modal characteristics, shipment characteristics and regional characteristics. This study proposes that the decision maker of the modal choice aims to maximize its own profit and considers revenue and cost drivers when making the modal decision. The results show that the manufacturing industries use more air shipping for both exports and imports when faced with a positive sales surprise and high demand variation. The results also indicate that more concentrated industries will use less air transport for both imports and exports. Modal decisions for exports are also impacted by the cost of capital and the gross margin ratio.
Resumen la programación de la producción en manufacturas tipo taller (job shop) encuentra muchas ... more Resumen la programación de la producción en manufacturas tipo taller (job shop) encuentra muchas aplicaciones en sistemas reales de producción, como empresas metalmecánicas, de impresión, de textiles y otras más. En general, en estos sistemas de ...
Executive Summary Flight delay is a serious and widespread problem in the United States. Increasi... more Executive Summary Flight delay is a serious and widespread problem in the United States. Increasing flight delays place a significant strain on the US air travel system and cost airlines, passengers, and society at many billions of dollars each year. While a number of previous studies have attempted to estimate the total economic impact of delays, scientific knowledge about the cost of delay is still limited. The Federal Aviation Administration sponsored the five NEXTOR universities and the Brattle Group to conduct a ...
Executive Summary Flight delay is a serious and widespread problem in the United States. Increasi... more Executive Summary Flight delay is a serious and widespread problem in the United States. Increasing flight delays place a significant strain on the US air travel system and cost airlines, passengers, and society at many billions of dollars each year. While a number of previous studies have attempted to estimate the total economic impact of delays, scientific knowledge about the cost of delay is still limited. The Federal Aviation Administration sponsored the five NEXTOR universities and the Brattle Group to conduct a ...
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