Ingeniería Electrónica

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  • Publicación
    Análisis de una etapa de conversión bidireccional en un sistema autónomo de generación de energía renovable operando en corriente continua
    (Universidad de Ibagué., 2019) Aldana Rodríguez, Yeison Alejandro; López Santos, Oswaldo
    This document describes the modeling, design, simulation and experimental validation of a bidirectional DC / DC converter dedicated to the interconnection between ELVDC (48V) and LVDC (240V) buses in a hybrid micro network. The converter has a nominal power of 250W and operates at a constant switching frequency of 25 kHz. The operation of the converter is described for three modes required in the application: Buck Mode, Boost Mode and Power Transfer Mode. The results obtained are satisfactory in terms of efficiency, which takes values greater than 85% in the operating range and has a maximum of 94% in Boost Mode. The research assistance from which this report is derived is part of the “Smart hybrid microred pilot plant for agricultural automation and electrical autonomy applications in sustainable rural housing MIREDHI - LAB” project, which seeks to implement and integrate generation systems, Power conversion, control and monitoring of a smart hybrid microred pilot plant.
  • Publicación
    Acceso abierto
    Método automático para la detección de quistes en el cerebro de cerdos a partir de imágenes de resonancia magnética
    (Universidad de Ibagué., 2019) Hatty Ramírez, Luisa María; Barragán Aya, Yesid Armando; Forero Vargas, Manuel Guillermo
    The digital processing of images applied to the biomedical area has become an indispensable tool for better medical information extracting, assisting reliable diagnosis. Neurocysticercosis is an infectious disease known to cause the presence of cysts in the brain. The most frequent symptoms are convulsions and headache. The study of drugs to combat this disease is carried out on animal models such as pigs, given that for ethical reasons it is not originally possible to do it on human being. Normally, the study is done on microscopic images of different cuts of the brain of the animal. Recently, the use of magnetic resonance imaging has been proposed for study, but the analysis is generally complex due to unwanted pig movements, which does not allow high-resolution acquisitions. Currently, there is no method that allows a quick and efficient analysis from the magnetic resonance images of the pig's head in order to obtain valuable information to prove the effectiveness of medicines in the treatment of this disease; thus the analyses are performed manually, which takes a great amount of effort and time. Hence the importance of designing a method based on image processing techniques to identify the amount of cysts presents in the brain and its volume to evaluate the effectiveness of the treatment. Thus, this work describes the method developed in Java programming language applied to the free image processing software ImageJ to obtain the number and volume of cysts.
  • Publicación
    Acceso abierto
    Separación y conteo de células musculares en procesamiento de imágenes
    (Universidad de Ibagué., 2019) Urrego Gamboa, Diego Alejandro; Español Díaz, Jorge Danilo; Forero Vargas, Manuel Guillermo
    In medicine and pharmacology it is common to use animal models for the development and evaluation of new medications, since, by ethics, it is not possible to cause harm or experiment with humans. However, little has been done in biomedical engineering to facilitate the work of scientists for studies on these models. In particular, a difficulty that arises in the analysis of muscle tissue is the identification and counting of cells in microscopy images of lower rat limbs. This task is usually done manually, which makes it tedious, subjective, inaccurate, not reproducible and expensive in time. For this reason, in this work a semi-automatic technique was developed based on image processing techniques that allows to accelerate the cell counting process, significantly reducing the analysis time and increasing the accuracy. An editing tool was included to correct the results obtained. For the study, images provided by the Stem Cell Laboratory of the Department of Physiology and Pathological Transplantation of the University of Milan, Italy were used. The method implemented as a tool of the ImageJ program was evaluated and compared with Ground Truth images, obtaining a reduction in time of 83%.
  • Publicación
    Acceso abierto
    Programación y comunicación con el AFE (ADS1299)
    (Universidad de Ibagué., 2019) Bocanegra Culma, Henry Agustin; Gallo Sánchez, Luisa Fernanda
    This research proposes the use of AFE (ADS1299), its manufacturer exposes some surface mounting parameters that served as the basis for the design of the PCB in Corel DRAW. The bibliographic review opens a path regarding the application of the field of study, as can be seen in this review of the state of the art prototypes have been developed in which the ADS1299 is projected as a fundamental piece for the capture of biomedical signals and depending on There are several cards used as a teacher that allow communication and visualization. A PCB with adequate size is obtained, using surface materials that provide less noise to the system, whose economic value is accessible. The reverse engineering process applied to the master-slave cards of the Texas Intruments, served as a significant guide for the hardware construction parameters that had not been taken into account, as a result of the selection of the arduino DUE (master) of the already developed plate. The test signals allowed a clear operation of the system as a whole, subsequently the capture of biomedical signals was performed by evaluating them through Matlab software, validating the information with the Texas instruments kit; results with equal signals in 98% are examined, and in another validation with the “concentration level determination” software prepared by the students of the University of Ibagué; I present optimal biomedical signals in amplitude, frequency and with a minimum level of noise, which checked the operation of this program.
  • Publicación
    Acceso abierto
    Monografía “Audio y electroacústica”
    (Universidad de Ibagué., 2019) Hernández V., Gersson Mateo; Gutiérrez G., Rodolfo José
    As technology advances, it is possible to find increasingly novel audio devices, these elements are currently more common and important in the life of the humans. The development of acoustics is extensive and requires an understanding of the functioning of the sensory organs responsible for auditory perception, to understand the physical fundamentals present in the electroacoustic elements that compose audio systems in the current market and how they can be use properly, in addition to its implementation for the conditioning of spaces.