Revista Visión Electrónica: algo más que un estado sólido

1

Authors: Harold Vacca González

http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7977/9607

4

Authors: Harold Vacca

http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7854/9585

7

Authors: Fabio Hernando Castellanos Moreno, Jaime Francisco Pantoja Benavides

This article presents a method that provides a simple way to find the constant coefficients required in the solution of a differential equation with Cauchy-Euler structure. Although this method is not fundamental in the solution of a differential equation of this type, it does propose an innovative and practical vision of differential equations of higher order with Cauchy structure in order to find the constant coefficients. Firstly, the article offers an introduction to differential equations and their usefulness (e.g. solid mechanics, buckling of columns); then, the structure of a Cauchy-Euler equation is presented followed by the proposed method, including mathematical proof, which guarantees the reliability of the method. Finally, conclusions are drawn regarding the usefulness of the method. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7863/9592

8

Authors: Marcelo Herrera Martínez, Edwar Jacinto Gómez, Edilberto Carlos Vivas G.

The present paper deals with the subjective evaluation of audio coding technologies using the “Similarity Rating” psychometric method. Compressed audio excerpts are presented to a group of experienced listeners by pairs of stimuli. Each pair represents a different type of distortion, with compression included. These types of distortion correspond to three psychoacoustic attributes, sharpness, roughness, and fluctuation strength. Listener’s task is to evaluate the degree of similarity between the pairs. The final output is the localization of each measured codec in this psychoacoustic space. Multidimensional scaling is the statistic technique, belonging to Multivariate Statistical methods, which allows processing the results obtained from this method. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7867/9595

9

Authors: Jeimy Lorena Pérez Ibarra, Hernán Darío Toro Zapata

The immune system is responsible for the body defense against strange organisms. This type of control is performed by molecules and cells in an organized way. The proposed model consists in a system of ordinary deferential equations intended to resemble the interaction between HIV and the immune response when considering cytotoxic cells. Standard local stability analysis at the virus free equilibrium is carried out to determine the theoretical conditions that avoid infection. Simulations were run to obtain results for particular immunological conditions and also to describe the dynamics of the system when facing infection states http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7862/9591

9

Authors: Carlos Enrique Montenegro Marín, Juan Manuel Cueva Lovelle, Jordan Pascual Espada

This article is aimed at determining the feasibility of using a common mechanism to define the configuration in games for mobile devices. Such a configuration is intended to increase the level of abstraction up to a point where the definition of a platform game in XML format is made independent. This should then be read and deployed in an automatic way over any mobile platform. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7887/9598

9

Authors: Hector Arturo Flórez Fernández

Nowadays, human disabilities are very common in all places around the world. However, when one person has a disability affecting one of the senses (e.g., sight, hearing), that person usually increases his/her capabilities with other senses. For instance, people with sight-associated disability normally increase their acuteness in senses like hearing and smell. Taking advantage of this human characteristic, in this paper we propose a prototype to offer patients with sight disability the opportunity to identify a set of colors using small amounts of particular essence. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7890/9600

10

Authors: Carlos H. Caicedo E, Ali Smida, Ricardo Romero U.

La rationalité signifie principalement un calcul et une faculté calculable; est l’usage adéquat de la théorie, du pratique et de l´évaluation de la raison, c’est-à-dire: qu´elle doit être utilisée pour adopter des croyances, prendre des décisions et évaluer correctement. D’un autre côté, l’irrationalité apparaît quand on reconnaît et évalue positivement la spécificité de l’affectif, c’est-à-dire: les passions, les émotions, les sentiments et les désirs. Cet article réfléchit sur la rationalité (irrationalité) de l’utilisation des technologies de la santé - médicaments, les dispositifs médicaux et chirurgicaux et des systèmes de soutien organisationnel et où ces soins est donné - et leur cycle de vie correspondant, dans un pays en développement comme la Colombie, quand existe une pression de la part de l’Industrie pour incorporer de manière continuelle et massive les nouveaux dispositifs et les équipements sans évaluer et identifier les critères de prix a caractère effectif des innovations versus les technologies existantes. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/8033/9639

11

Authors: Alma G. Rodríguez, Luis R. Vidal P, Juan Miguel Díaz M, Cesar Leonardo González Pinzón

This paper discusses the development process involved in making a user interface translate G-Code (ISO6983) using Microsoft Visual Basic 2010 together with communication protocol OPC. This interface was developed in three modules, the first one verifies syntax and lexicon, the second is a command converter for a Programmable Logic Controller Allen Bradley L63 using a SERCOS interface card and servo drive ULTRA 3000, and the last one executes motion control instructions. The interface is used for a profile milling process, on an XY plane and using G00, G01, G02 and G03 codes generated in a Fanuc postprocessor 3XMILL. The interface shows errors detected in the verification module according to the parameters established and identifies the corresponding line; it also monitors the XY position in real time, The interface allows line-by-line execution or automatic mode. The interface does not require information for cutting speed, tool advance speed, and spindle speed or tool compensation from the NC program. The interface was also developed using incremental and reuse oriented methodologies. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7888/9599

12

Authors: carlos Arturo Castillo Medina, Octavio José Salcedo Parra, Felipe Forero Rodríguez

This article gathers relevant information that sheds light into the basic principles that motivated the study of the so called Next Generation Networks (NGN). The concepts presented herein include the most recent studies and standards that have been proposed for a suitable operation of NGN. The issues associated to the use of new types of networks and services are illustrated and analyzed; in particular the article illustrates important aspects issues like network architecture, network management and mobility. Additionally, trends for future studies are suggested according to the main challenges of NGN. The current trend suggests that certain key aspects are yet to be solved before establish the actual owner of an NGN network. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7893/9603

14

Authors: José A. Martínez V, Fredy H. Martínez S.

Tree-related power outages represent significant costs and failure rates in power supply. The existence of trees implies that the solution to this problem should focus on optimizing pruning cycles. This optimization is of great importance because of the costs associated to such maintenance. This paper is intended to propose a methodology for the maintenance of trees based on data analysis. Starting from the information captured in the field, we use techniques and models based on fuzzy logic and genetic algorithms, which keeps maintenance tasks on the optimal time and place. The strategy is aimed at two key aspects: first, the history of failures caused by trees on medium-voltage power supplies, this information is used to calculate quality indicators (energy not supplied [ENS] and number of users affected [NU]*) only regarding to tree-associated failure. We use a fuzzy logic based system to ponder and find the critical circuits on which forest maintenance should be performed. Second, we construct an objective function based on treenetwork distance and growth patterns of trees per species in order to simulate forest maintenance. To this end, a genetic algorithm is used to determine the optimum pruning cycle of a given power supply. We use real historical data of medium voltage circuits for the system setting as well as for the evaluation of performance. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7868/9596

14

Authors: Alfonso Toledo Ballén

This article presents an exercise in political science simulation applied via artificial neural networks software called Easy NN-plus 15.0, with reference to possible political scenarios that can emerge once conclude the dialogue between the guerrillas of the armed revolutionary forces of Colombia (FARC-EP) and Juan Manuel Santos’s administration, whose aims to solve through negotiated via the internal armed conflict that is afflicting Colombia more than half a century ago. The political scenarios referred to as input layer for the Perceptron were: democratic stability, civil war, coup d’État, revolution, political reform and authoritarian modernization; the output layers were: democratic openness and the continuation of the conflict; while the interlayer was formed with the complex interrelationship of the six entry scenarios. The computer program was used to relate complex non-linear factors of the political challenge posed by the dialogue, to improve the analytical understanding of the situation. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7898/9605

21

Authors: Yuly Jazmin Oviedo, Karen Lorena Espítia, Luis Fernando Pedraza

This paper presents the design and implementation of a web platform for student tracking and notification using SMS and email (at a school called Instituto San Francisco (Bogotá,Colombia). Firstly, the document addresses the needs of the school, which represent the main concern for this academic web platform. Subsequently, this paper shows the analysis of technologies and describes the design of the platform based on the requirements of the institution. Additionally, the web platform performance analysis and testing results are included. Finally, results of implementing the academic web platform at Instituto San Francisco are provided together with the conclusions and recommendations drawn at the end of the project. http://revistas.udistrital.edu.co/ojs/index.php/visele/article/view/7866/9594