Revista Visión Electrónica: algo más que un estado sólido

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Authors: Harold Vacca González

Nacido en Tokio (Japon) en 1927; graduado de Cientco con especialidad en Fsica Teorica, de la Universidad Imperial de Tokio. Docente de la Universidad Estatal de Ibaraki desde 1951 hasta 1962

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Authors: Harold Vacca González

Con los libros ocurre lo mismo que con las personas: hay que tomarlos en serio.

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Authors: Lely A. Luengas, Miguel A. Gutierrez, Esperanza Camargo

This study was designed to evaluate the average force under each foot and variation in location of center of plantar pressure during static standing, in amputees by landmines and non-amputees subjects. Fifteen subjects were evaluated (ten non-amputees, five men and five women, and five amputees, all men, age range 20-40 years), they are functional. Five measurements were performed for each subject, following the protocol established for the measurement. The template system Pedar R was used. The statistical analysis used was ANOVA, to confirm that the data obtained in the measurements are valid. It was confirmed that the location of the COP on each foot is affected by the use of dentures, it is required to confirm whether the alignment of the prosthesis influences COP, is left for further study.

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Authors: Jhon Edwin Vera, Jhon Fredy Bayona, Ricardo Sanchez Cayanza

When it comes to alternative energy, solar panels are one of the most studied due to its excellent performance under uniform solar radiation. This paper shows the advantages, simulation and implementation algorithm developed in an incremental conductance lowend DSP -digital signal processing- Texas Instrument TMS320F28069 R, in order to find and extract maximum power, performing tests on a resistive load.

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Authors: Jaime Andr´es Restrepo Giraldo

This paper presents the results of investigation of the likelihood that the Kyoto Protocol provides for the development of projects of the Clean Development Mechanism, CDM forestry, river basin Ot´un, Risaralda department, Colombia. It also analyzes the feasibility of implementation in this area consists of several national parks and protected areas for wildlife, likewise, the investigation establishes what are the potential risk factors (political, economic or technical) in the implementation of CDM projects and proposes guidelines for administration. The study concludes and recommends that these projects may well go ahead and be successful if clear policies by the State, if it has the support of environmental NGOs and if, fundamentally, is achieved by the active participation of local communities in the definition and ongoing assessment.

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Authors: Javier Eduardo Martınez Baquero

There are various forms of environmental pollution, one of which is caused by oily mixtures which are particularly discharged into water sources from economic activities such as washing vehicles, service stations, and others. This article research shows a way to mitigate these polluting effects through the design and construction of an automated equipment that performs the separation of a mixture of water-oil. The separation of the oil mixture is carried out in a corrugated plate interceptor (CPI), and accompanied by a Programmable Logic Controller (PLC) S7 1200, through which the user is allowed to perform the process efficiently, thanks to high percentage of separation has been achieved with respect to the initial mixture. Then, was divided into three methodological steps , first the CPI separator built, setting turn the variables of interest, second was designed and implemented the Automation and third results were validated by testing. Three variables were defined; level, the most important in the system, also temperature and flow, for each of them has been implemented appropriate instrumentation for data collection subsequently entering the PLC. The main result is that the process is efficient as it manages to recover more than 90% of the water present in the initial oily fluid, this evidenced by the implemented instrumentation , allowing reuse and subsequent saving precious liquid.

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Authors: Nychol Bazurto Gomez, Carlos Alberto Martınez Morales, Helbert Eduardo Espitia Cuchango

In this paper, we propose an ANFIS model based that verify their effectiveness compared to real data to determine the coffee berry borer proliferation risk in a colombian context, verifying its effectiveness compared to real data collected by the ICA in a study of the Integrated Management of Broca. As an initial step, four input variables are determined and a fuzzy model (made in another job), including factors were used: temperature, altitude, age and quality of the crop harvesting. A set of 144 rules and 20 times of training, the results were satisfactory and close to the actual infestation level, fulfilling the target of generating information regarding this problem by using engineering techniques.

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Authors: Vıctor Manuel Gomez Ramırez, Juan Carlos Serna Bedoya, Luisa Velez Lopez

The mechanical vibration analysis has great importance in the condition based maintenance; in this sense, the bearings are elements that affect more stops rotating machinery. Therefore, this paper describes the hardware and software architecture of a vibration analyzer developed in LabVIEW R oriented to study bearings extracting its parameters or descriptors through the power spectral density (PSD) and the RMS and DC signal values in time. Shows the advantages of working with such solutions: cost and the possibility of increasing benefits as needed.

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Authors: Marco Antonio Abarca Rodrıguez, Mariko Nakano Miyatake, Hector Manuel Perez Meana

This article present a system for creating and credential authentication personal identification (ID) safe, using one-dimensional and two-dimensional barcodes, data encryption and symmetric key technique watermark. To do this, a watermark is inserted on the photo of the user, generated from a unique identification code which will be available in printed credential so that at the time of validation of the credential is carried by calculating the cross-correlation between the watermark contained in the photograph of the user and the watermark calculated at the time of validation using the same unique identification code. We show that proper selection of parameters for inserting the watermark: length, gain, position of the watermark and decision threshold, are essential to ensure the proper functioning of the proposed scheme, ensuring maintain sufficient quality in visual image to the user recognition and in turn be robust enough to withstand the attack of converting digital-analog (D / A) and analog-digital (A/D).

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Authors: Frank Ernesto Alvarez, Julian Bravo Castillero, Raul Guinovart Dıaz, Leslie D. Perez Fern´andez y Reinaldo Rodrıguez Ramos

The asymptotic homogenization method is applied to homogenize a one-dimensional family of elliptic boundary value problems with periodic and rapidly oscillating coefficients which depend on two fast variables. The homogenized problem, the local problems and the corresponding effective coefficient are obtained. A necessary and sufficient condition for constructing an asymptotic solution with periodic terms is demonstrated. Based on a Maximum Principle the proximity between the solutions of the homogenized and original problems is proved. Some numerical computations are used to illustrate the mathematical justification.

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Authors: Felipe A. Corredor Ch, Juan D. Villamarın V.

Everyday in network management, it is complex the process to correlate events in different dimensions: legal violation, intrusions, monitoring failures, violation to security policies or breach of standards; to which face professionals, teaching and students in this area in Colombia. This article presents the technological aspects for the design and development of a distributed system for the computational anomalies detection that was termed “Asturiux”, which arises as a product from a research project in the teleinformatics area. To addressing this problematic it use the network security administration, and anomalies detection. The system was fully developed with free software, in which were integrated different technologies for the communication, authentication, persistence, computational intelligence and remote alerts. The verification instruments and the realized tests, reflect a high level of system efficiency, and acceptation from the actors involved

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Authors: Hugo Segura Benavides, Carlos Andres Porras Niño, Henry Montaña Quintero

The purpose of this article is to monitor the vibrational behavior of the gas compressor Worthington, with a global view point system process production plant Turgas S.A. ESP, about a PC in the control room, for reasons of comfort and safety. Thus this technology with safe and timely decisions, real time, taking into account the relative dangers of natural gas. By monitoring the vibration level compressor wanted quality improvement process, production weather facilitates work and reduces costs. Additionally, the research project aims to develop a technique that allows the noun, plural follow vibrational analysis applied to predictive maintenance, for machine stoppages and thus evaluate when are necessary preventive maintenance scheduled so avoiding unwanted accidents operational personnel, disruption the environment, apart from expensive damage in electrical or mechanical components represented in volume production, time and money invested for Company.

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Authors: Harold Vacca González

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

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Authors: Harold Vacca

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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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