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.