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Caldas, Colombia

The Universidad Distrital Francisco José de Caldas is a public, coeducational, research university based Bogotá, Colombia. It is the second most important public higher education institution in the city, after the National University of Colombia, with a population of 26,140 students. It was founded in 1948, by Priest Daniel de Caicedo, who would become its first rector, with the support of the Bogotá City Council, as the Municipal University of Bogotá . It changed its name to the current in 1957 when the municipality of Bogotá became a district. Its establishment was officialized by the 1970 decree No. 1030, issued by the national government. The university offers 70 programs at undergraduate and postgraduate levels, including 4 master and 1 doctorates.The university is member of the Association of Colombian Universities , the Iberoamerican Association of Postgraduate Universities , and the Iberoamerican University Network Universia. Wikipedia.

Quintana H.A.R.,District University of Bogota | Noguera J.A.H.,National Autonomous University of Mexico | Bonells C.F.U.,University of la Salle of Colombia
Journal of Materials in Civil Engineering

In tropical countries, roads built with asphalt layers must be made with bituminous mixtures containing asphalt that is reasonably stiff to increase resistance against permanent deformations, i.e., rutting. When the available asphalt is not stiff enough, an alternative is to modify it using Gilsonite. This article presents the laboratory results of tests performed on samples of Gilsonite-modified hot mix asphalts modified by wet and dry processes. Gilsonite increases the stiffness and improves the performance grade of a virgin binder at high temperatures of service. Additionally, Gilsonite-modified hot mix asphalts developed a greater strength and stiffness under monotonic and dynamic loading. © 2015 American Society of Civil Engineers. Source

Murillo G J.F.,University of Cordoba, Colombia | Lopez C.O.,University of Cordoba, Colombia | Espitia R M.J.,District University of Bogota
Results in Physics

We employed density functional theory (DFT) in order to study the structural, electronic, and magnetic properties of pure AlN and C-atom-doped AlN compounds. The calculations were carried out using the method based on pseudopotential, employed exactly as implemented in Quantum ESPRESSO code. For the description of the electron-electron interaction, generalized gradient approximation (GGA) was used. The calculations showed that the substitution of a C atom at the N site introduce a magnetic moment of about 1.0μB, while two C atom substitutions introduce a magnetic moment of about 2.0μB. These magnetic properties become hybridization states C-2p and their first neighboring Al-2p and first neighboring N-2p atoms. Calculated magnetic properties indicate that C-doped AlN compound can potentially be used in diluted magnetic semiconductors. © 2015 The Authors. Source

Gonzalez F.,Colombian School of Industrial Careers | Guarnizo J.G.,District University of Bogota | Benavides G.,University Jorge Tadeo Lozano
IEEE Latin America Transactions

A wheeled robot for object transportation in a distribution center is emulated and presented in this paper. The robot follows a free trajectory which is controlled by artificial vision and fuzzy logic modules. The artificial vision system includes a webcam located in the upper part of the distribution center and it is used to calculate the location of the robot. Specifically, image segmentation technique of red color was implemented in the artificial vision system to determine the robot's position and orientation. The information obtained from the webcam is also used by the fuzzy controller to estimate the robot's velocity which is then send to the mobile robot wirelessly. The control of the motors and the wireless communication of the robot are performed by an Arduino platform which supports an Xbee module for communications. The image processing and fuzzy control are implemented on a PC using Matlab. © 2014 IEEE. Source

Nunez-Valdez E.R.,University of Oviedo | Cueva Lovelle J.M.,University of Oviedo | Sanjuan Martinez O.,University of Oviedo | Garcia-Diaz V.,University of Oviedo | And 2 more authors.
Computers in Human Behavior

The goal of this research is to define and capture a series of parameters that allowed us to perform a comparative analysis and find correlations between explicit and implicit feedback on recommender systems. Most of these systems require explicit actions from the users, such as rating, and commenting. In the context of electronic books this interaction may alter the patterns of reading and understanding of the users, as they are asked to stop reading and rate the content. By simulating the behavior of an electronic book reader we have improved the feedback process, by implicitly capturing, measuring, and classifying the information needed to discover user interests. In these times of information overload, we can now develop recommender systems that are mostly based on the user's behavior, by relying on the obtained results. © 2012 Elsevier Ltd. All rights reserved. Source

Rojas-Galeano S.A.,District University of Bogota
2015 Workshop on Engineering Applications - International Congress on Engineering, WEA 2015

Passenger overcrowding on station platforms and buses of Bogota's Bus Rapid Transit (TransMilenio - TM) is becoming a critical factor causing discomfort in its user base. We reflect on this problem motivated on the idea that the current strategy of using fixed routes and bus schedules can be improved with a dynamic strategy allowing bus stop tables to adapt according to commuter demand and affluence. Following this line of thought we describe a simple heuristic for stop table adaptation intended to yield more timely-effective service for passenger mobility. The heuristic considers a simplified model based on several aspects of the system: the origin-destination trip matrix, the distribution of destination's demand, the capacity and headways of buses on express and frequent (all-stops) services. Some infrastructure aspects required for a practical simulation or implementation of the heuristic are discussed in passing. © 2015 IEEE. Source

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