Now showing items 41-60 of 1614

    • Voltage sag assessment using an extended fault positions method and Monte Carlo simulation 

      Sagre, Jorge Washington; Candelo, John Edwin; Montaña Chaparro, Johny Hernán
      In this article, we propose an extended fault positions method combined with the Monte Carlo method to evaluate voltage sags. The distribution function SARFI is obtained by taking into account the randomness of (i) location ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Conversion of an existing electrostatic precipitator casing to Pulse Jet Fabric filter in fossil power plants 

      Manzano-Agugliaro, Francisco; Carrillo-Valle, Javier
      The combustion process of power generation plants originates particulates. There are different technologies to collecting particulate such as electrostatic precipitators (ESPs) or fabric filters. Currently, these ESPs take ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Evaluation of internal and external stresses on the SPT sampler 

      Zapata, Juliana; Esquivel, Edmundo Rogerio
      The NSPT index is usually used in empirical correlations to estimate parameters of the soil, carrying capacity, foundation settlement, etc. Because these correlations have no scientific basis, researchers have been developing ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Probabilistic seismic hazard analysis using a new ground motion intensity measure 

      Chávez López, Robespiere; Bojórquez-Mora, Edén
      The main objective of this work is to compute the probabilistic seismic hazard analysis for a region of Mexico using a new ground motion intensity measure which is based on the spectral acceleration and a parameter proxy ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Environmental study of gold mining tailings in the Ponce Enriquez mining area (Ecuador) 

      Peña Carpio, Elizabeth; Menendez-Aguado, Juan M
      As a result of the artisanal mining activities in Ecuador (specially in Ponce Enriquez mining area, province of Azuay), great quantities of mining wastes have been disposed, usually without adequate management standards. ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • HMI/ SCADA standards in the design of data center interfaces: A network operations center case study 

      Filali-Yachou, Said; González-González, Carina S.; Lecuona-Rebollo, Carlos
      This paper presents an evaluation of interfaces at the Network Operations Center NOC (Network Operations Center) in terms of HMI standards and related regulations, as well as the ergonomic monitoring GEDIS guide. The Centre ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Integration model of collaborative supply chain 

      Bautista Santos, Horacio; Martínez Flores, José Luis; Fernández Lambert, Gregorio; Bernabé Loranca, María Beatriz; Sánchez Galván, Fabiola; Sablón Cossío, Neyfe
      The strategic members of collaborative supply chain have been looking for actions to synchronize their links. The purpose is to improve the customer service and fulfill the challenges of the globalized competitiveness. ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Development of a digital TV receivers test suite 

      Flores Guridi, Pablo; Garella, Juan Pablo; Guimerans, Gustavo; Baliosián, Javier; Grampín, Eduardo; Sotelo, Rafael; Simon, María
      The deployment of digital TV in Uruguay is ongoing, following the ISDB-Tb standard. The channels allocation process was completed, and after the adoption of a testing protocol, the introduction of decoders and receivers ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Mining unstructured data to support requirements elicitation by using controlled vocabularies: A systematic mapping study 

      Barros-Justo, José Luis
      This paper presents a work-in-progress that deals with the assessment of the use of controlled vocabularies during the processes of requirements engineering, as a means to mine data from different sources (interviews, ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Comparing the efficiency of performing complex tasks with a tablet and a smartphone 

      Botella, Federico; Moreno, Juan P.; Peñalver, Antonio
      The number of users who today use a smartphone or a tablet as a tool on a daily basis is increasing. Professionals, in certain environments, are moving towards mobile devices instead of the traditional laptop or desktop ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Development of a concept-based EMG-based speller 

      Damaševičius, Robertas; Vasiljevas, Mindaugas; Šumskas, Tomas
      Physiological computing is a paradigm of computing that treats users’ physiological data as input during computing tasks in an Ambient Assisted Living (AAL) environment. By monitoring, analyzing and responding to such ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Behavior of coated forming tools with TiAlN coatings grown by Triode Magnetron Sputtering 

      Devia Narvaez, Diana Marcela; Duque-Sanchez, Harold; Mesa, Fernando
      This research focusses on tribological analysis of Titanium Aluminum Nitride (TiAlN) coatings deposited by means of Triode Magnetron Sputtering, when used as a protective coating on forming tools. The analysis is carried ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Effects of uncertainty on scheduling of highway construction projects 

      Gómez, Hernán Darío; Orobio, Armando
      Time and cost overruns in highway construction are usual in Colombia. Contractors regularly fail in cost estimation and construction scheduling. An analysis of important factors on time and cost overruns in highway ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Channel connections resistance at elevated temperatures 

      Larrua Pardo, Yisel; Larrua Quevedo, Rafael; Pignatta Silva, Valdir
      In this paper the thermal analysis of the push out test of steel – concrete channel connections at elevated temperatures is carried out. The study takes into account numeric results generated by the program SuperTempcalc ...
      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. 
    • Capacitated vehicle routing problem for PSS uses based on ubiquitous computing: An emerging markets approach 

      Ochoa-Ortíz, Alberto; Ornelas-Zapata, Francisco; Margain-Fuentes, Lourdes; Cedillo-Campos, Miguel Gastón; Sánchez-Aguilar, Jöns; Jaramillo-Vacio, Rubén; Ávila, Isabel
      The vehicle routing problem under capacity constraints based on ubiquitous computing in a perspective of deploying PSS (Product-Service Systems) configurations for urban goods transport, is addressed. It takes into account ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • A new synthesis procedure for TOPSIS based on AHP 

      Aguarón-Joven, Juan; Escobar-Urmeneta, María Teresa; García-Alcaraz, Jorge Luis; Moreno-Jiménez, José María; Vega-Bonilla, Alberto
      Vega et al. [1] analyzed the influence of the attributes’ dependence when ranking a set of alternatives in a multicriteria decision making problem with TOPSIS. They also proposed the use of the Mahalanobis distance to ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Intuitionistic Fuzzy MOORA for Supplier Selection 

      Pérez-Domínguez, Luis; Alvarado-Iniesta, Alejandro; Rodríguez-Borbón, Iván; Vergara-Villegas, Osslan
      The supplier selection is a critical activity within the administration of the supply chain. It is considered a complex problem given that it involves different aspects such as the alternatives to evaluate, the multiple ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Structural analysis for the identification of key variables in the Ruta del Oro, Nariño Colombia 

      Delgado Martínez, Aida Mercedes; Pantoja Timarán, Freddy
      As proposed by Michael Godet, an Structural Analysis exercise applied to achieve a representation of the system as close to reality as possible, and reducing its complexity to its essential macrovariables in the research ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Technical efficiency of thermal power units through a stochastic frontier 

      Marmolejo-Saucedo, José Antonio; Rodríguez-Aguilar, Román; Cedillo-Campos, Miguel Gastón; Salazar-Martínez, María Soledad
      This work presents a model to obtain a stochastic frontier production function of a Mexican power generation company. The stochastic frontier allows us to evaluate the technical efficiency of an energy producer according ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna.