Ingenieria最新文献

{"title":"Restauración de imágenes borrosas usando un modelo regularizado de programación lineal","authors":"J. Fuentes, Jorge Mauricio Ruiz","doi":"10.14483/23448393.17240","DOIUrl":"https://doi.org/10.14483/23448393.17240","url":null,"abstract":"espanolContexto: Los problemas de minimizacion en el sentido de los minimos cuadrados han sido constantemente usados en la restauracion de imagenes borrosas. Estos se caracterizan por ser sensibles a valores atipicos afectando significativamente la calidad de la imagen restaurada. Teniendo en cuenta que la norma L1 es menos sensible a datos atipicos, el problema de restauracion de imagenes borrosas se plantea como un problema de programacion lineal. Metodo: Un metodo de punto interior se utiliza para la solucion del problema de programacion lineal. Se presenta la adaptacion de tecnicas de regularizacion al problema de programacion lineal de la imagen buscada y su derivada. Se realiza un estudio comparativo con otras tecnicas de restauracion bajo diferentes tipos de difuminado de imagenes. Resultados: Se probo que el metodo propuesto conduce a mejoras notables en las imagenes recuperadas. Los experimentos numericos muestran que el metodo de programacion lineal funciona mucho mejor que los propuestos en la literatura, en terminos de valores de PSNR, SSIM y en la calidad visual de las imagenes reconstruidas. Conclusiones: El problema de programacion lineal regularizado puede utilizarse eficazmente como modelo matematico del problema de restauracion de imagenes borrosas. Para trabajos futuros se plantea el estudio de la seleccion automatica de parametros de regularizacion y solucion de restauracion sin conocimiento previo del nucleo de difuminado. EnglishContext: Minimization problems in the sense of least squares have constantly been used in the restoration of blurred images. They are characterized by their sensitivity to outliers, which significantly affects affecting the quality of the restored image relevantly. Since the L1-norm is less sensitive to outliers, the image deblurring problem is posed as a linear programming problem. Method: An interior point method is used to solve the linear programming problem. This article presents the adaptation of regularization techniques of the image sought and its derivative to the problem of linear programming. A comparative study with other restoration methods under different types of image blurring is conducted. Results: The proposed method leads to remarkable improvements in the recovered images. Numerical experiments show that the linear programming method works much better than those proposed in the literature, in terms of PSNR and SSIM values, as well as in the visual quality of the reconstructed images. Conclusions: The regularized linear programming problem can be effectively used as a mathematical model of the image deblurring problem. For future work, there are plans to study of the automatic selection of regularization parameters and restoration solutions without prior knowledge of the blur kernel.","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43127089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efecto de la suciedad en el desempeño de módulos fotovoltaicos en Bogotá","authors":"Fabian León-Vargas, Maira García-Jaramillo, Gelver Magín Yara, A. Parra","doi":"10.14483/23448393.16601","DOIUrl":"https://doi.org/10.14483/23448393.16601","url":null,"abstract":"Effect of Soiling on the Performance of Photovoltaic Modules in Bogotá Efecto de la suciedad en el desempeño de módulos fotovoltaicos en Bogotá Fabián León-Vargas∗ 1, Maira García-Jaramillo 2, Gelver Magín Yara 1, Alejandro Parra 3 1Universidad Antonio Nariño (Bogotá, Colombia), 2Universidad EAN (Bogotá, Colombia), 3Universidad de la Salle (Bogotá, Colombia). correspondence email: fabianleon@uan.edu.co","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47652117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparativa multi e hiperespectral del pasto Cynodon nlemfuensis bajo condiciones tropicales y de pastoreo con ganado lechero","authors":"Alberto Francisco Coto Fonseca, A. M. Rojas González","doi":"10.15517/ri.v32i1.46129","DOIUrl":"https://doi.org/10.15517/ri.v32i1.46129","url":null,"abstract":"La información espectral ha sido utilizada ampliamente en el estudio de las condiciones nutricionales y en el desarrollo de diversos cultivos empleados en el ámbito agrícola, pero existe un vacío de investigación en especies forrajeras para condiciones tropicales. El presente estudio contempló la comparación de información multi e hiperespectral correspondientes al cultivo de pasto Estrella Africana (Cynodon nlemfuensis) dedicado a la alimentación de ganadería lechera usando espectroscopia de campo e información satelital de Sentinel-2. Se determinó que existe una heterogeneidad de la firma espectral del cultivo, debido al patrón aleatorio de alimentación por parte del ganado y la variación de las condiciones ambientales. Se generaron zonas con distintas alturas del cultivo, influyendo directamente en los valores de reflectancia, índice de área foliar e índices de vegetación. Se compararon los índices espectrales calculados con información de campo y satelital, obteniéndose valores de R2 de 0,725 para el caso del NDVI y de 0,446 para el SAVI. La presente investigación es de gran relevancia ya que sienta la línea base del uso de información espectral para el estudio de pastos dedicados a la alimentación de ganado lechero a partir de sensores remotos y espectrorradiometría de campo.","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48445890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Renovando mucho m´as que la confianza","authors":"N. Diaz","doi":"10.14483/23448393.17819","DOIUrl":"https://doi.org/10.14483/23448393.17819","url":null,"abstract":"Nota editorial Vol. 26 No.1","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49123056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metodología FMECA para un aerogenerador doblemente alimentado","authors":"Andrey Alberto Solano, Brandon Cruz Jiménez, Cristian Andrés Ramos Fernández, Kevin Solís Guzmán, Oscar Núñez Mata, Aramis Pérez Mora","doi":"10.15517/ri.v31i2.46100","DOIUrl":"https://doi.org/10.15517/ri.v31i2.46100","url":null,"abstract":"Debido a la complejidad de los sistemas eólicos, la necesidad de contar con aerogeneradores fiables es de suma importancia, por ello se han desarrollado metodologías para mejorar sus características y desempeño. El método de análisis de modos de falla, efectos y criticidad se ha utilizado para estudiar la confiabilidad de diferentes sistemas de generación de energía. En este documento se presenta la aplicación de dicha metodología a un aerogenerador de inducción doblemente alimentado, para realizar una evaluación cualitativa y cuantitativa de las características de falla en el mismo. Además, para tomar en cuenta consideraciones económicas en el análisis, se presenta el enfoque del método basado en el riesgo, con el fin de mitigar las limitaciones que presenta el método tradicional. Como resultado se determina que la prioridad de atención debe enfocarse en el generador, luego el sistema eléctrico y posteriormente en las palas.  ","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44100328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"El sistema de distribución y la eficacia en programas de asistencia nutricional infantil. Caso Bienestarina-Colombia","authors":"Feizar Javier Rueda Velasco, Wilson Adarme-Jaimes, Jesus Gonzalez-Feliu","doi":"10.14483/23448393.15582","DOIUrl":"https://doi.org/10.14483/23448393.15582","url":null,"abstract":"La Revista INGENIERIA es una publicacion cuatrimestral de caracter cientifico editada por la Universidad Distrital Francisco Jose de Caldas. La Revista esta dirigida a la comunidad academica, investigadores, sectores productivos, institutos de investigacion y en general al publico interesado en los temas del campo de la Ingenieria y Tecnologia. Su principal objetivo es difundir y debatir avances en investigacion a traves de la publicacion de articulos originales e ineditos, con pertinencia local o internacional.","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42386463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fare inequities in public transit system in Costa Rica","authors":"Cristhian Santiago Quirós Calderón, Jonathan Agüero-Valverde","doi":"10.15517/RI.V31I2.45018","DOIUrl":"https://doi.org/10.15517/RI.V31I2.45018","url":null,"abstract":"Problems in transit fare equity affect the daily commute of specific groups that depend mostly on public transportation. Previous studies showed that some routes present operational characteristics that increased the price charged to the users. To address this issue, a methodology to identify the routes that have fares much higher than expected, after considering operational parameters, is developed. This paper presents a methodology implemented to evaluate fare inequities in public transport networks. The case study is the bus public transport network in Costa Rica. The evaluation is performed using fare per kilometer as independent variable and operational variables, such as route length, monthly ridership and vehicle occupancy by using cluster analysis and Bayesian multilevel modelling. The results indicate that random coefficients models perform better than independent models for clustered data. Furthermore, the routes with higher differences between observed and estimated (i.e. expected) fares are the ones to be addressed first in individual audits, because these are the routes who charge higher operational costs into the fare, increasing inequity among the population.","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41247467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Análisis de la calidad de aguas de vertido en el Distrito de Riego Arenal-Tempisque (DRAT)","authors":"Anayansi Wong Monge, A. M. Rojas González","doi":"10.15517/RI.V31I2.44123","DOIUrl":"https://doi.org/10.15517/RI.V31I2.44123","url":null,"abstract":"El Distrito de Riego Arenal-Tempisque (DRAT) es la dependencia gubernamental que regula la distribución del agua de riego en las fincas agrícolas de la provincia de Guanacaste.  El DRAT monitorea semestralmente la calidad del agua de vertido utilizada en irrigación, a través de reportes operacionales.  Sin embargo, no es una práctica común en distritos de riego realizar estudios donde se analice el comportamiento de los parámetros medidos en el tiempo. \u0000Este estudio desarrolló una evaluación multivariada y geoestadística a partir de la caracterización de dos variables microbiológicas y veinte parámetros físico-químicos de la calidad del agua con respecto a componentes espaciales como: localización, área y distancia. Además, se realizó un análisis de estadística descriptiva para doce puntos de muestreo evaluados en un período de diez años (2008-2018). Se aplicó un análisis de componentes principales (ACP), donde los autovectores no mostraron diferencias apreciables para visualizar el peso de las variables de forma independiente. No obstante, el análisis permitió agrupar los parámetros que explican el comportamiento dentro del sistema estudiado como: la concentración de sales (CP1); las sustancias activas al azul de metileno y el contenido de nitratos totales (CP2); y la dinámica biológica (CP3); que se pueden relacionar con prácticas agrícolas. \u0000Adicionalmente, se llevó a cabo un análisis de conglomerados jerárquicos para los lugares en estudio y una regresión de mínimos cuadrados parciales (PLS2) con respecto a las variables geoestadísticas, obteniéndose que para ambas pruebas los resultados fueron concordantes con el ACP. \u0000 ","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48975130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Método simplificado para estimar las respuestas sísmicas de puentes continuos de vigas de concreto presforzado","authors":"Mark Michel Rondón Salvatierra, Víctor I. Fernández-Dávila","doi":"10.15517/RI.V31I2.44199","DOIUrl":"https://doi.org/10.15517/RI.V31I2.44199","url":null,"abstract":"Continuous deck bridges of prestressed concrete beams are a type of bridge widely used in Peruvian engineering, due to the advantages that these bridges represent in the optimization of resources in the design and construction stages. The present investigation proposes simplified expressions in two directions of analysis to calculate the fundamental period of vibration of the bridge and the elastic seismic responses of lateral displacement, shear force, and a bending moment of the pier with the highest seismic demand. These expressions were obtained from the elastic seismic analysis carried out on a set of parametric models. As a seismic load, seismic design spectra were used according to isoacceleration maps specified in the bridge manual of the Peruvian Ministry of Transportation. Initially, a simplified model formulated that represents the structural elements of the bridge, then the parameters that define its seismic behavior were identified and a large number of cases of parametric models were generated. The most representative parameters are defined as longitudinal slenderness (H/B), transverse slenderness (H/D), the aspect ratio of the plan (R/L), number of spans (nt), and peak ground acceleration (PGA). To validate the simplified model, results of interest obtained from the proposed model were compared with those obtained from refined structural models carried out in a specialized engineering program, which includes the effects of common supports and seismic stoppers. Finally, the expressions of the simplified method allow estimating seismic responses with errors of less than 10%.","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48277480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Incertidumbre asociada a la indicación de los instrumentos para pesar verificados","authors":"Luis Omar Becerra Santiago, L. M. Peña","doi":"10.15517/RI.V31I2.45134","DOIUrl":"https://doi.org/10.15517/RI.V31I2.45134","url":null,"abstract":"espanolEn el presente trabajo se estima la incertidumbre asociada con la indicacion en uso de los instrumentos para pesar el funcionamiento no automatico, el cual ha sido verificado acorde con la recomendacion internacional OIML R76. Esta recomendacion de la Organizacion Internacional de Metrologia Legal (OIML) sirve de base para la verificacion de los instrumentos para pesar de funcionamiento no automatico para la gran mayoria de los paises; sin embargo, no se conoce de manera explicita el valor de incertidumbre relacionada con los resultados de los instrumentos verificados durante su uso EnglishIn the present work the uncertainty associated with the indication in the use of verified non-automatic weighing instruments according to the international recommendation OIML R76, is estimated. This recommendation of the International Organization of Legal Metrology (OIML) serves as the basis for the verification for most of the countries, however, the uncertainty associated with results of verified instruments during its use are not known explicitly.","PeriodicalId":41509,"journal":{"name":"Ingenieria","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48350505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}