13 results on '"OREJUELA CABRERA, JUAN PABLO"'
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2. Multi-objective model for perishable food logistics networks design considering availability and access
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Orjuela-Castro, Javier Arturo, Orejuela-Cabrera, Juan Pablo, and Adarme-Jaimes, Wilson
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- 2022
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3. Supply Chain Network Design of Perishable Food in Surplus Periods
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Orjuela-Castro, Javier Arturo, Orejuela-Cabrera, Juan Pablo, and Adarme-Jaimes, Wilson
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Multi-objective model ,collection-wholesale centers ,perishable fruits ,farmers ,shopkeepers - Abstract
Research on the design of the perishable food supply chain network has increased in recent years. However, little attention has been given to those seasonal foods that generate periods of oversupply and, particularly, to their impact on the sustainability of small producers in developing countries. This research proposes and develops a multi-objective mixed linear programming model for perishable fruits in a south American country at oversupply periods. It minimizes losses and transportation costs and maximizes the inclusion of farmers. It considers four echelons of the supply chain: farms, collection centers, distribution centers and the demand, which is represented by the agroindustry, wholesalers, shopkeepers, and hypermarkets. The Epsilon constraint method is used to solve the multi-objective model. A set of Pareto optimal solutions helped evaluate tradeoffs between the three objectives and find the location of collection and distribution centers. The proposed generic mathematical model is applicable to any food supply chain, as it allows for the improvement of the established performance measures and the distribution flows for the different echelons. The model considers the losses in perishable food from the impacts caused by changes in temperature (T0) and humidity level (RH) at different thermal floors of mountain ranges., International Journal on Food System Dynamics, Vol 14, No 1 (2023)
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- 2023
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4. Methodology to determine the installed capacity of an academic program
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Manyoma Velásquez, Pablo César, Orejuela Cabrera, Juan Pablo, and Gil González, Cristiam Andrés
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- 2011
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5. Propuesta Metodológica Para la Programación de la Producción en Las Pymes del Sector Artes Gráficas, Área Publi-Comercial
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Orejuela Cabrera, Juan Pablo, Ocampo Carrillo, Julieth Juliana, and Micán Rincón, Camilo Andrés
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- 2010
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6. Programação de operações de fornecimento interno de materiais em uma planta de concentrado de pré-moagem
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Rojas Trejos, Carlos Alberto, Saavedra Arango, Luis Felipe, and Orejuela Cabrera, Juan Pablo
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requerimentos de materiais ,costo total relevante ,Programação de operações ,programação lineal ,total relevant cost ,Programación de operaciones ,linear programming ,requerimientos de materiales ,materials requirements ,programación lineal ,custo total relevante ,operations scheduling - Abstract
Introduction. This research addresses the problem of internal materials supply operations in a pre-milling type concentrate food plant. The required amount of raw materials for production in the internal supply chain is determined by minimizing the total relevant operational cost, made up by the setup cost and the stock maintenance cost, which maximizes efficiency of the resources used in the process. This study takes into account such factors as capacity of the hoppers, the time-dependent setup sequence, routes of supply hoppers, filling rates and supply times, based on a model of mixed-integer linear programming. Objective: Provide a strategy that allows efficient use of resources in the production process, subjected to the demand of materials from the material requirements planning (MRP) of the company under study. Materials and methods. The short-term multi-period model defines the scheduling of elevators and conveyors for each time period, and the amount of raw materials that is sent to each hopper and bins. Results. This research determines the amount of initial stock required to operate, as well as the operations strategy that the company under study must follow, so that it meets the demand for raw materials, making efficient use of the resources used in the production process. Conclusion. In the analysis of results and presentation of scenarios, the most representative cost, the one related to stock maintenance, could be observed. Since this is a critical factor for companies belonging to this sector, we present an innovative proposal, both in practice and in the literature, to contribute to minimizing the total setup cost and the cost of maintenance of raw material stock in hoppers through a rational use of resources. RESUMEN Introducción. Esta investigación aborda el problema de programación interna de materiales en una planta de alimentos concentrados, tipo pre-molienda. La cantidad necesaria de materias primas para la producción en la cadena de alimentación interna se determina mediante la minimización del costo total relevante de la operación, compuesto por el costo de alistamiento y el costo de mantenimiento del inventario, lo cual maximiza la eficiencia de los recursos empleados en el proceso. Para ello se consideran factores tales como la capacidad de las tolvas, las rutas y velocidades de llenado y los tiempos de suministro contenidos en un modelo de programación lineal, entera, mixta. Objetivo. Brindar una estrategia que permita el uso eficiente de los recursos empleados en el proceso, sujetos a la demanda interna de materiales del plan de requerimiento de materiales (MRP) de la empresa objeto de estudio. Materiales y métodos. El modelo multi-período a corto plazo define en cada período de tiempo la programación de los elevadores o transportadores, y la cantidad de materias primas que se envía a cada tolva. Resultados. La investigación determina la cantidad de inventario inicial requerido para la operación, además de la estrategia de operaciones que la compañía objeto de estudio debe seguir con el fin de satisfacer la demanda de materias primas, haciendo una utilización eficiente de los recursos empleados en el proceso productivo. Conclusión. En el análisis de los resultados y en la presentación de los escenarios, el costo más representativo es el relacionado con el mantenimiento del inventario; este es un factor crítico en las empresas pertenecientes a este sector. Por ello, se presenta una propuesta innovadora para este tipo de procesos productivos, con el fin de contribuir a minimizar el costo de total de alistamiento y el costo de mantenimiento de las existencias de materia prima en tolvas mediante un uso racional de los recursos. RESUMO Introdução. Esta investigação aborda o problema de programação interna de materiais numa planta de alimentos concentrados, tipo pré-moagem. A quantidade necessária de matérias primas para a produção na cadeia de alimentação interna se determina perante a minimização do custo total relevante da operação, composto pelo custo de preparação e o custo de manutenção do inventário, o qual maximiza a eficiência dos recursos empregados no processo. Para isso se consideram fatores tais como a capacidade das funis, as rotas e velocidades de enchimento e os tempos de subministro conteúdos num modelo de programação lineal, inteira, mista. Objetivo. Brindar uma estratégia que permita o uso eficiente dos recursos empregados no processo, sujeitos à demanda interna de materiais do plano de requerimento de materiais (MRP) da empresa objeto de estudo. Materiais e métodos. O modelo múlti-período a curto prazo define em cada período de tempo a programação dos elevadores ou transportadores, e a quantidade de matérias primas que se envia a cada funil. Resultados. A investigação determina a quantidade de inventário inicial requerido para a operação, ademais da estratégia de operações que a companhia objeto de estudo deve seguir com o fim de satisfazer a demanda de matérias primas, fazendo uma utilização eficiente dos recursos empregados no processo produtivo. Conclusao. Na análise dos resultados e na apresentação dos cenários, o custo mais representativo é o relacionado com a manutenção do inventário; este é um fator crítico nas empresas pertencentes a este setor. Por isso, se apresenta uma proposta inovadora para este tipo de processos produtivos, com o fim de contribuir a minimizar o custo de total de preparação e o custo de manutenção das existências de matéria prima em funis perante um uso racional dos recursos.
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- 2017
7. Cellular Manufacturing System Selection with Multi-lean Criteria, Optimization and Simulation
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Bocanegra-Herrera, Claudia C. and Orejuela-Cabrera, Juan Pablo
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optimización ,analytic network process-ANP ,discrete-event simulation ,manufactura celular ,proceso de redes jerárquico ,cellular manufacturing ,optimization ,simulación de eventos discretos - Abstract
Introduction: This study proposes a method to design and balance a cellular manufacturing system of a typical industrial company to obtain an optimal configuration in terms of the process, total cost, idle time and reliability criteria. Methods: The developed method has three phases. The first phase obtains candidate solutions using optimization models to minimize the cycle time and total cost. In the second phase, the performance measures for the remaining criteria of each candidate solution are found using discrete-event simulation. In the last phase, the optimal configuration is selected using the analytic network process (ANP). Results: The proposed method was validated with a practical case, where the optimal configuration had the best reliability with a zero-smoothness index, which minimized the wasted time and excess inventory. However, it was not the configuration with the lowest cost. Conclusions: This method has two contributing elements: multiple lean criteria and the approach, which combines different solution strategies to select the best configuration in an integral manner. Resumen Introducción: Esta investigación propone una metodología para diseñar y balancear un sistema de manufactura celular de una empresa industrial típica con el propósito de obtener una configuración óptima bajo los criterios de, proceso, costo total, tiempo ocioso y confiabilidad. Métodos: La metodología desarrollada tiene tres fases. La primera fase consiste en obtener soluciones candidatas usando modelos de optimización para minimizar tiempo de ciclo y costo total. En la segunda fase se encuentran las medidas de desempeño de los demás criterios para cada solución candidata utilizando simulación de eventos discretos. En la última fase se escoge la configuración óptima utilizando el análisis de decisión multicriterio. Resultados: La metodología propuesta fue validada en un caso práctico donde la mejor configuración encontrada tiene la mayor confiabilidad, un índice de suavidad de cero que minimiza el desperdicio de tiempo y el exceso de inventario, aunque no fue la configuración con menor costo. Conclusiones: Esta metodología tiene dos elementos de contribución: el primero, que involucra múltiples criterios lean, y el segundo, el enfoque que combina diferentes estrategias de solución para la selección de la mejor configuración de una manera integral.
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- 2017
8. Last Mile Logistics in Mega-Cities for Perishable Fruits.
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Orjuela-Castro, Javier Arturo, Orejuela-Cabrera, Juan Pablo, and Adarme-Jaimes, Wilson
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FRUIT , *PERISHABLE foods , *SOCIAL impact , *VEHICLE models , *LOGISTICS - Abstract
Purpose: A common problem in mega cities is congestion, due to the size of the automotive park, this makes that the perishable foods decreasing their organoleptic characteristics or increases their losses, which requires considering the effect of time on routing problems. The state of the art demonstrates the need to formulate new routing models that include the specific characteristics of perishable foods in order to reduce their losses. Design/methodology/approach: A mathematical model was formulated based on two classical models: the three-index vehicle flow model proposed by (Golden, Assad, Levy & Gheysens, 1984) and the time window model proposed by (Cordeau, Desaulniers, Desrosiers, Solomon & Soumis, 1999). We proposed a novel VRP Model that permits reductions loss due to the perishable. Findings: The optimum cost is found with AMP® for twenty nodes, six vehicles and six fruits. For more nodes, a two-phase strategy is proposed, first a clustering based on a modified p-median model and then a VRP for each cluster. Research limitations/implications: The results showed the need to investigate multiobjective models, since the performance measures can be efficiency, quality and response capacity; the model can be applied in other supply chains of perishable foods. Social implications: According to FAO in Logistics practices in the last mile generate between 10-30% of the perishable food loss in developing countries' mega-cities. Originality/value: A last-mile logistics strategy is proposed to manage delivery routes for fresh fruits in mega-cities, considering the effect of congestion through travel time in the perishability function. The new model it uses the flow variable to control the amount of each fruit arriving to each node and the time variable to define fruit waste or loss depending on the time and type of fruit. [ABSTRACT FROM AUTHOR]
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- 2019
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9. Balanceo de líneas de producción en la industria farmacéutica mediante Programación por metas.
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Orejuela Cabrera, Juan Pablo and González, Andrés Flórez
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GOAL programming , *EIGENFUNCTIONS , *WORK in process , *STOCHASTIC models , *HUMAN behavior models - Abstract
Introduction- In a production Line it's important that the stations' cycle times are balanced and that they are low since this allows to reduce the work in process. However, doing this leads to an increase in the stations' number, that is not favorable because it raises the costs associated with the stations, therefore it is necessary to define strategies that allow achieving a balance between these requirements. Objective- In this article we propose the formulation of a model for the line balancing, using the technique of multi-objective goal programming, applied to the pharmaceutical industry in order to minimize the stations' number, minimize cycle time and inventory in process. Methodology- Goal programming is used to address a line balance model, which considers at the same time the assignment of multiple stations to one operation and the assignment of multiple operations to one station. Results- A significant decrease in cycle time and idle time at minimum costs is achieved, and a comparison between the deterministic and stochastic models is presented. Conclusions- Through this implementation of the LINGO model, the compliance of the proposed restrictions, the precedence of operations and the proper functioning of the model were validated through the optimal solutions obtained. The simulation is a tool that illustrates the complexity of the operations of the production system, which require, as in our case, a more realistic modeling to understand the behavior of the process and evaluate different strategies. [ABSTRACT FROM AUTHOR]
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- 2019
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10. Metodologia para determinar a capacidade instalada em um programa acadêmico
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MANYOMA VELÁSQUEZ, PABLO CÉSAR, OREJUELA CABRERA, JUAN PABLO, and GIL GONZÁLEZ, CRISTIAM ANDRÉS
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metodología ,Capacity ,metodologia ,methodology ,planificação da capacidade ,medição do serviço ,university ,universidade ,Capacidade ,planificación de la capacidad ,Capacidad ,capacity planning ,service measurement ,medición del servicio ,universidad - Abstract
Measuring capacity is a major problem, especially in service organizations because of its complexity and the lack of research on this topic at these kinds of organizations. Therefore, the purpose of this article is to discuss a methodology for measuring the capacity of an university by focusing on an academic unit. To this end, this research study determines the available capacity of an academic program and the use of resources by a typical student, and then the relation between these two aspects. The proposal is validated for an undergraduate program, generating a fairly good estimate of the number of students who can be served at any given time. La medición de la capacidad es un problema de gran importancia, especialmente en las organizaciones de servicios dada su complejidad y la poca investigación realizada al respecto. En este sentido, el presente artículo tiene como objetivo desarrollar una metodología para la medición de la capacidad de una universidad desde la particularidad de una unidad académica. Para ello se determina cuál es el consumo de recursos de un estudiante típico, cuál es la capacidad instalada de los recursos y cuál es la relación existente entre estos dos elementos. La propuesta es validada en un programa de pregrado, generando una aproximación muy buena al número de estudiantes que pueden ser atendidos en un momento dado. A medição da capacidade é um problema de grande importância, especialmente nas organizações de serviços dada sua complexidade e a pouca investigação realizada a esse respeito. Nesse sentido, este trabalho tem como objetivo desenvolver uma metodologia para a medição da capacidade de uma universidade a partir da particularidade de uma unidade acadêmica. Para isso se determina qual é o consumo de recursos de um estudante típico, qual é a capacidade instalada dos recursos e qual a relação entre esses dois elementos. A proposta é validada em um programa de graduação, gerando uma ótima aproximação ao número de alunos que podem ser atendidos em um determinado momento.
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- 2011
11. Scheduling of internal materials supply operations in a pre-milling type concentrate food plant.
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Rojas Trejos, Carlos Alberto, Saavedra Arango, Luis Felipe, and Orejuela Cabrera, Juan Pablo
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EDIBLE plants ,RAW materials ,SUPPLY chains ,MAINTENANCE costs ,LINEAR programming - Abstract
Copyright of Producción Más Limpia is the property of Corporacion Universitaria Lasallista and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2017
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12. Simulation-optimization model to determine the installed capacity of an educational services system.
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Gil González, Cristiam Andrés, Manyoma Velásquez, Pablo César, and Orejuela Cabrera, Juan Pablo
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EDUCATIONAL evaluation ,HIGHER education ,EDUCATION & training services industry ,COMPUTER simulation ,SERVICE industries ,EDUCATION research - Abstract
Copyright of Revista Lasallista de Investigación is the property of Corporacion Universitaria Lasallista and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2016
13. MODELO MATEMÁTICO PARA LA UBICACIÓN DE ESTACIONES DE TRANSFERENCIA DE RESIDUOS SÓLIDOS URBANOS
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Varón-Valencia, Katherine, Orejuela-Cabrera, Juan Pablo, and Manyoma-Velásquez, Pablo César
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Estaciones de transferencia ,problema de localización ,estaciones de transferencia ,lcsh:T ,lcsh:TA1-2040 ,programación lineal entera mixta ,recuperación de materiales ,lcsh:Engineering (General). Civil engineering (General) ,lcsh:Technology - Abstract
ResumenLas Estaciones de Transferencia son instalaciones que están dedicadas al manejo y traslado de Residuos Sólidos Urbanos o Municipales, desde un vehículo a otro con mayor capacidad de carga que los transporta hasta su sitio de aprovechamiento o disposición final. El objeto central de esta investigación es representar la localización de este tipo de instalaciones a través de un modelo de programación lineal entera mixta, que tiene en cuenta las principales características de las estaciones, como la capacidad total y la capacidad de recuperación de materiales. La función objetivo formulada busca reducir al mínimo los costos fijos de apertura, los costos de transporte y los costos de operación, evaluados en el momento actual a través de una función de costo presente equivalente.AbstractTransfer Stations are facilities dedicated to management, and solid waste transfer of a vehicle to another with greater capacity, which transports them to their place of use or disposal. The main purpose of the research is to represent the location of these kind facilities through a model of mixed integer linear programming, which consider different characteristics of stations such as total capacity and materials recovery. Total costs minimization is the main objective. To do this, we minimize opening fixed costs, transportation costs and operating costs evaluated at the current time through a function of present cost equivalent.ResumoAs estações de transferência são instalações que se dedicam ao manuseio e transporte de resíduos sólidos urbanos ou municipais de um veículo para outro com maior capacidade de transporte para o local de utilização ou eliminação. O objetivo central deste trabalho é o de representar a localização dessas instalações através de um modelo de programação linear inteira mista, que leva em conta as características principais das estações, como a capacidade total e resistência dos materiais. A função objetiva formulada visa minimizar os custos fixos de abertura, os custos de transporte e os custos operacionais, avaliados no momento através de uma função de custo presente equivalente. ResumenLas Estaciones de Transferencia son instalaciones que están dedicadas al manejo y traslado de Residuos Sólidos Urbanos o Municipales, desde un vehículo a otro con mayor capacidad de carga que los transporta hasta su sitio de aprovechamiento o disposición final. El objeto central de esta investigación es representar la localización de este tipo de instalaciones a través de un modelo de programación lineal entera mixta, que tiene en cuenta las principales características de las estaciones, como la capacidad total y la capacidad de recuperación de materiales. La función objetivo formulada busca reducir al mínimo los costos fijos de apertura, los costos de transporte y los costos de operación, evaluados en el momento actual a través de una función de costo presente equivalente.AbstractTransfer Stations are facilities dedicated to management, and solid waste transfer of a vehicle to another with greater capacity, which transports them to their place of use or disposal. The main purpose of the research is to represent the location of these kind facilities through a model of mixed integer linear programming, which consider different characteristics of stations such as total capacity and materials recovery. Total costs minimization is the main objective. To do this, we minimize opening fixed costs, transportation costs and operating costs evaluated at the current time through a function of present cost equivalent.ResumoAs estações de transferência são instalações que se dedicam ao manuseio e transporte de resíduos sólidos urbanos ou municipais de um veículo para outro com maior capacidade de transporte para o local de utilização ou eliminação. O objetivo central deste trabalho é o de representar a localização dessas instalações através de um modelo de programação linear inteira mista, que leva em conta as características principais das estações, como a capacidade total e resistência dos materiais. A função objetiva formulada visa minimizar os custos fixos de abertura, os custos de transporte e os custos operacionais, avaliados no momento através de uma função de custo presente equivalente.
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