Now showing items 21-40 of 1614

    • A framework to evaluate over-costs in natural resources logistics chains 

      Pérez-Salas, Gabriel; González-Ramírez, Rosa G.; Cedillo-Campos, Miguel Gastón
      Foreign trade barriers and duties have been significantly reduced by multilateral agreements and integration mechanisms among nations. Logistics costs represent a significant proportion of the final price of the items, ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A gas stations location and their relationship with the operational characteristics of a road network 

      Escobar Garcia, Diego Alexander; Younes Velosa, Camilo; Tamayo Arias, Johnny Alexander
      This research proposal applies geostatistical techniques to discover the relationship between the geographic locations of different gas stations and the operational characteristics offered by the transport network of the ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A general analytical approach for prestressed and non-prestressed concrete beam-columns reinforced with bonded and unbonded composites: (i) theory 

      Rodríguez Gutiérrez, José Alfredo; Aristizábal Ochoa, José Darío
      An analytical method that determines the short and long-term response of prestressed and non-prestressed concrete beam-columns reinforced with any combination of FRP bars or/and plates, steel rebars, bonded and/or unbonded ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A genetic algorithm to solve a three-echelon capacitated location problem for a distribution center within a solid waste management system in the northern region of Veracruz, Mexico 

      Pérez-Salazar, María Del Rosario; Mateo-Díaz, Nicolás Francisco; García-Rodríguez, Rogelio; Mar-Orozco, Carlos Eusebio; Cruz-Rivero, Lidilia
      Mexico is the world’s third largest consumer of Polyethylene Terephthalate (PET), only preceded by the United States and China. PET is commonly used in plastic containers such as beverage bottles and food packaging. It can ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A geometrical robust design using the Taguchi method: application to a fatigue analysis of a right angle bracket 

      Barea del Cerro, Rafael; Novoa, Simon Jose; Herrera, Francisco; Achiaga, Beatriz; Candela, Nuria
      The majority of components used in aeronautic, automotive or transport industries are subjected to fatigue loads. Those elements should be designed considering the fatigue life. In this paper the geometrical design of a ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A GIS approach based on user location to evaluate a bike-sharing program 

      Escobar Garcia, Diego Alexander; Zuluaga García, Juan David; Younes velosa, Camilo
      Bike-sharing systems (BSS) and Bike-sharing programs (BSP) have been implemented around the globe in the last decade for its benefits and for changing the paradigm that the car is not the main mode of transportation of ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A hazard index for roadside of two-lane rural roads 

      Rivera, Juan Ignacio; Echaveguren, Tomás
      Roadside areas are elements intended to reduce the Run-off-road crashes. The hazardousness is an indicator of compliance of this objective. There are few methods to measure hazardousness, which usually depend of the ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A hybrid genetic algorithm for ROADEF'05-like complex production problems 

      Frutos, Mariano; Olivera, Ana Carolina; Tohmé, Fernando
      In this work, we present a hybrid technique that combines a Genetic Algorithm with meta-heuristics to solve a problem in RENAULT France’s production plants. The method starts with an initial solution obtained by means of ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A hybrid metaheuristic algorithm for the capacitated location routing problem 

      Escobar, John Willmer; Linfati, Rodrigo; Adarme-Jaimes, Wilson
      This paper addresses the Capacitated Location-Routing Problem (CLRP) in which the aim is to determine the depots to be opened, the customers to be assigned to each open depot, and the routes to be performed to fulfill the ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A methodological model to assist in the optimization and risk management of mining investment decisions 

      Botín, José A.; Guzmán, Ronald R.; Smith, Martin L.
      Identifying, quantifying, and minimizing technical risks associated with investment decisions is a key challenge for mineral industry decision makers and investors. However, risk analysis in most bankable mine feasibility ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A methodology for analysis of cogeneration projects using oil palm biomass wastes as an energy source in the Amazon 

      Oliveira, Rosana Cavalcante de; Silva, Rogerio Diogne de Souza e; Tostes, Maria Emília De Lima
      In the search for strategies to mitigate climate change, the promotion of renewable energy is a major challenge worldwide, particularly for developing countries such as Brazil and Colombia, which aim to diversify their ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A methodology for knowledge modeling of fault diagnosis based on petri nets 

      Palacio Betancur, Juan Esteban; Zapata Madrigal, Germán Darío; Marín Gómez, Luis Eduardo; Velásquez Duque, José Ivan
      This paper presents a methodology for knowledge survey and modeling. The methodology aims to make an expert system for fault diagnosis and solution. The methodology comprises a plant system definition, information and ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A methodology to obtain an analytical formula for the elastic modulus of lightweight aggregate concrete 

      Souza-Barbosa, Flávio de; Resende-Farage, Michèle Cristina; Lage-Bonifácio, Aldemon; Beaucour, Anne Lise; Ortola, Sophie
      This work proposes a methodology to predict the elastic modulus of lightweight aggregate concretes. To this end an analytical formula is achieved by curve fitting experimental results from 135 concrete samples made of 45 ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A mixed-integer linear programming model for harvesting, loading and transporting sugarcane. A case study in Peru 

      Morales Chávez, Marcela María; Soto Mejía, José Adalberto; Sarache Castro, William Ariel
      Due to opportunities for economic and social development in the biofuels market, improvement to the supply chain has become a relevant matter. In agro-industrial supply chains, procurement costs are highly relevant. Since ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A mobile architecture for integration of smartphones with lbs for flora and fauna inventories 

      Casas Avellaneda, Diego Andres; López Parra, Javier Francisco
      Smartphones currently have a large number of sensors and more processing capacity, allowing greater integration of a mobile architecture supported by an external Location Based System. The following paper will contextualize ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A modified firefly-inspired algorithm for global computational optimization 

      Amaya, Iván; Cruz, Jorge; Correa, Rodrigo
      This article compares the original firefly-Inspired algorithm (FA) against two versions suggested by the authors. It was found that by using some modifications proposed in this document, the convergence time of the algorithm ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A multiobjective approach for non-discretionary variables in data envelopment analysis 

      Angulo Meza, Lidia; Soares de Mello, João Carlos; Gomes Junior, Silvio
      Data Envelopment Analysis is a non-parametrical approach for efficiency evaluation of so-called DMUs (Decision Making Units) and takes into account multiple inputs and outputs. For each inefficient DMU, a target is provided ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A new classification of geological resources 

      Mata Perelló, Josep M.; Mata Lleonart, Roger; Vintró Sánchez, Carla
      The traditional definition of the geological resource term excludes all those elements or processes of the physical environment that show a scientific, didactic, or cultural interest, but do not offer, in principle, an ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A new dynamic visualization technique for system dynamics simulations 

      Sotaquira-Gutierrez, Ricardo
      This article addresses a main research question in System Dynamics, the correct understanding of the relationship between model structure and behavior, from a new perspective: the field of Information Visualization. We ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A new mathematical model for coal flotation kinetics 

      Guerrero-Pérez, Juan Sebastián; Barraza-Burgos, Juan Manuel
      This study describes the development and formulation of a novel mathematical model for coal flotation kinetic. The flotation rate was considered as a function of chemical, operating and petrographic parameters for a global ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna.