Revista Facultad De Ingenieria-universidad De Antioquia最新文献

{"title":"Use of Convolutional Neural Networks in Smartphones for the Identification of Oral Diseases Using a Small Dataset","authors":"Jormany Quintero-Rojas, Jesús David González","doi":"10.19053/01211129.V30.N55.2021.11846","DOIUrl":"https://doi.org/10.19053/01211129.V30.N55.2021.11846","url":null,"abstract":"espanolEl reconocimiento y procesamiento de imagenes es una herramienta adecuada en los sistemas que usan metodos de aprendizaje automatico. La adicion de telefonos inteligentes como herramientas complementarias en el area de la salud para el diagnostico es un hecho hoy en dia por las ventajas que presentan. Siguiendo la tendencia de proporcionar herramientas para el diagnostico, esta investigacion tuvo como objetivo desarrollar una aplicacion movil prototipo para la identificacion de lesiones bucales, incluyendo lesiones potencialmente malignas, basado en redes neuronales convolucionales, como la deteccion temprana de indicios de posibles tipos de cancer en la cavidad bucal. Se desarrollo una aplicacion movil para el sistema operativo Android que implemento la libreria de TensorFlow y el modelo de redes neuronales convolucionales Mobilenet V2. El entrenamiento del modelo se realizo por transferencia de aprendizaje con una base de datos de 500 imagenes distribuidas en cinco clases para el reconocimiento (Leucoplasia, Herpes Simple Virus Tipo 1, Estomatitis aftosa, Estomatitis nicotinica y Sin lesion). Se utilizo el 80% de las imagenes para el entrenamiento y el 20% para la validacion. Se obtuvo que la aplicacion presento al menos 80% de exactitud en el reconocimiento de cuatro clases. Se usaron las metricas de f1-valor y area bajo la curva para evaluar el desempeno. La aplicacion movil desarrollada presento un comportamiento aceptable con metricas mayores al 75% para el reconocimiento de tres lesiones, por otro lado, arrojo un desempeno desfavorable menor al 70% para identificar los casos de estomatitis nicotinica con el conjunto de datos elegido. EnglishImage recognition and processing is a suitable tool in systems using machine learning methods. The addition of smartphones as complementary tools in the health area for diagnosis is a fact nowadays due to the advantages they present. Following the trend of providing tools for diagnosis, this research aimed to develop a prototype mobile application for the identification of oral lesions, including potentially malignant lesions, based on convolutional neural networks, as early detection of indications of possible types of cancer in the oral cavity. A mobile application was developed for the Android operating system that implemented the TensorFlow library and the Mobilenet V2 convolutional neural network model. The training of the model was performed by transfer learning with a database of 500 images distributed in five classes for recognition (Leukoplakia, Herpes Simplex Virus Type 1, Aphthous stomatitis, Nicotinic stomatitis, and No lesion). The 80% of the images were used for training and 20% for validation. It was obtained that the application presented at least 80% precision in the recognition of four class. The f1-score and area under curve metrics were used to evaluate performance. The developed mobile application presented an acceptable performance with metrics higher than 75% for the recogn","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"28 1","pages":"5"},"PeriodicalIF":1.0,"publicationDate":"2021-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84860936","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":"Dynamic Lighting System to Increase the Attention of Design Students in the Classroom","authors":"Andrés Eduardo Nieto-Vallejo, J. E. Camacho, Roberto Cuervo-Pulido, Edgar Hernandez-Mihajlovic","doi":"10.19053/01211129.V30.N55.2021.12233","DOIUrl":"https://doi.org/10.19053/01211129.V30.N55.2021.12233","url":null,"abstract":"Dynamic lighting is playing a key role in education, by considering the main photometric variables such as the correlated color temperature and the illuminance to increase student’s attention levels inside the classroom. In the case of design students, the project component is fundamental for teaching, where students mainly need to develop activities such as presentation to listen to the teacher instructions, ideation and sketching to propose a solution according to the problem being addressed, and exhibition to present the work that has been done. These activities require specific and adequate lighting conditions to generate a positive impact on the performance of students. This article presents the design of a dynamic lighting system capable of adjusting the correlated color temperature in a range from 2500 K to 6500 K and the illuminance levels in a range from 0 lx to 800 lx to enhance the sustained and fixed attention of design students inside the classroom according to the type of activity that is being developed. The performance of the system was 1 M. Sc. Pontificia Universidad Javeriana (Bogotá-Distrito Capital, Colombia). nieto-andres@javeriana.edu.co. ORCID: 0000-0003-1934-8552 2 M. Sc. Pontificia Universidad Javeriana (Bogotá-Distrito Capital, Colombia). j-camacho@javeriana.edu.co. ORCID: 0000-0003-1357-4858 3 Ph. D. Pontificia Universidad Javeriana (Bogotá-Distrito Capital, Colombia). rcuervo@javeriana.edu.co. ORCID: 0000-0003-4624-0678 4 M. Sc. Pontificia Universidad Javeriana (Bogotá-Distrito Capital, Colombia). edgar.hernandez@javeriana.edu.co. ORCID: 0000-0003-1692-741X Dynamic Lighting System to Increase the Attention of Design Students in the Classroom evaluated experimentally by measuring student’s attention inside the ergonomics and usability laboratory by using the Gesell chamber, the Emotiv Epoc EEG Headset with 14 electrodes to measure the brain activity and obtain engagement and focus levels, the eye tracking Tobii glasses, and a protocol to evaluate performance including several surveys and camera observation. In conclusion, the dynamic lighting system can improve the attention of design students by configuring the photometric variables according to the type of activity that is being done.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"25 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81042556","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":"Internet of Things at the Service of Bioconstruction","authors":"Fabián Ricardo Corredor-Sanchéz, Juan Sebastián González-Sanabria, M. Mendoza-Moreno","doi":"10.19053/01211129.V30.N55.2021.12266","DOIUrl":"https://doi.org/10.19053/01211129.V30.N55.2021.12266","url":null,"abstract":"espanolEl enfoque de Internet de las Cosas (Internet of Things - IoT) promueve la interconexion de los objetos que el ser humano usa cotidianamente para que sean administrados, controlados y/o monitoreados a traves de tecnologias telematicas. Este paradigma tiene un amplio campo de aplicacion, como apoyo a diferentes esquemas de desarrollo en diversidad de areas. Para el caso de las construcciones, se cuenta con esquemas domoticos, pero existe el mito en este ambito de la incompatibilidad entre los sistemas digitalizados y los esquemas “bio”. Sin embargo, las bioconstrucciones requieren consideraciones esteticas, estructurales, ambientales y tecnologicas para integrar sistemas eficientes y amigables, contribuyendo a un medio ambiente sostenible, generando y regulando los recursos del entorno en el que son implementadas. De esta manera, se ha desarrollado un proceso de investigacion documental guiado a determinar el grado de aplicabilidad del IoT para bioconstrucciones. Como resultado, se identifica un conjunto de tecnologias propias del IoT que pueden promover la administracion y control de los agentes establecidos normativamente para una bioconstruccion de espacios habitacionales. EnglishThe Internet of Things (Internet of Things - IoT) approach promotes the interconnection of objects that humans use on a daily basis so that they are administered, controlled and/or monitored through telematic technologies. This paradigm has a wide field of application to support several development schemes in a variety of areas. In the case of construction, there are home automation schemes, but regarding bio-constructions, the myth of incompatibility between digitized systems and “bio” schemes exists. However, bio-constructions require aesthetic, structural, environmental and technological considerations to integrate efficient and friendly systems, contributing to a sustainable environment, generating and regulating the resources of the environment in which they are implemented. In this way, a documentary research process has been developed to determine the degree of applicability of IoT for green buildings. As a result, a set of IoT technologies was identified, which can promote the administration and control of the normatively established agents involved in a bio-construction for living spaces.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"19 1","pages":"2"},"PeriodicalIF":1.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75335582","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":"Constructive Technology Assessment: Systematic Review and Future Study Needs","authors":"Óscar Iván Rodríguez-Cardoso, V. Ballesteros-Ballesteros, Manuel Francisco Romero-Ospina","doi":"10.19053/01211129.V30.N55.2021.12459","DOIUrl":"https://doi.org/10.19053/01211129.V30.N55.2021.12459","url":null,"abstract":"Engineering, understood as the gathering of scientific and technological knowledge for innovation, creation, advancement and optimization of techniques, as well as a set of useful tools to meet social needs and solve technical problems of both individuals and the community, makes its main actors, engineers, key players in sustainable development and in the creation of alternatives that minimize the negative effects of technology on society. It is in this sense that technology assessment approaches should take importance among those who manage technology development and implementation policies. Generally, the undesirable effects of the intrusion of a new technology are acted upon when they already occur, and technology assessment is intended to anticipate the risk. This paper presents a bibliographic review of technology assessment, its approaches and future study needs. Based on an articulating axis that positions technological change and innovation as an imperative need for social development, an exhaustive review of related articles in specialized databases was carried out. The most important results of this work reveal that the field of technological assessment has been strongly inclined towards the health or sanitary sector; however, research is being developed 1 M. Sc. Fundación Universitaria Los Libertadores (Bogotá-Distrito Capital, Colombia). oscar.rodriguez@libertadores.edu.co. ORCID: 0000-0003-1203-4999 2 Ph. D. (c) Fundación Universitaria Los Libertadores (Bogotá-Distrito Capital, Colombia). vladimir.ballesteros@libertadores.edu.co. ORCID: 0000-0002-6920-789X 3 M. Sc. Fundación Universitaria Los Libertadores (Bogotá-Distrito Capital, Colombia). mfromeroo@libertadores.edu.co. ORCID: 0000-0002-6457-8827 Constructive Technology Assessment: Systematic Review and Future Study Needs Revista Facultad de Ingeniería (Rev. Fac. Ing.) Vol. 30 (55), e12459. Enero-Marzo 2021. Tunja-Boyacá, Colombia. L-ISSN: 0121-1129, e-ISSN: 2357-5328. DOI: https://doi.org/10.19053/01211129.v30.n55.2021.12459 in central engineering topics such as the development of nanotechnology, robotics, and the handling of big data, where the European model stands out as a reference for technological assessment processes due to its inclusive and democratic nature.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"17 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81755225","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":"Application of Micro-Raman Spectroscopy for the Quantitative Analysis of Vitrinite Reflectance in Medium and High Rank Colombian Coals","authors":"Ruben-Dario Urbano-Noguera, H. Estupiñán-Duran, Gustavo Neira-Arenas","doi":"10.19053/01211129.V29.N54.2020.12241","DOIUrl":"https://doi.org/10.19053/01211129.V29.N54.2020.12241","url":null,"abstract":"The structural changes and the degree of maturity of three Colombian coals from the Santander and Antioquia provinces were studied using a simple and fast curve fitting method of the RBS parameters (the distance between band G and band D), FWHM G (total width at half the maximum of the G band) and AR (area of the Raman spectrum), obtained by deconvolution and band resolution of the Micro-Raman spectra. The results were compared by morphological and chemical analysis using a SEM scanning electron microscope coupled with a solid state X ray EDS detector. A percentage of vitrinite reflectance (% Ro) of 4.3 %, 3.8 % and 0.07 % was obtained, a percentage of carbon by EDS analysis of 91.47 %, 87.78 %, 73.4 %, a morphological description by SEM analysis presenting smooth, rough surfaces and rough-lumpy and pore size between 0.7 μm 0.8 μm, 1.3 μm 1.5 μm and 0.2 μm 1 M. Sc. (c) Universidad Nacional de Colombia (Medellín-Antioquia, Colombia). rdurbanon@unal.edu.co. ORCID: 0000-0001-5289-0621. 2 Ph. D. Universidad Nacional de Colombia (Medellín-Antioquia, Colombia). haestupinand@unal.edu.co. ORCID: 0000-0002-9607-3364. 3 Ph. D. Universidad Nacional de Colombia (Medellín-Antioquia, Colombia). gneira@unal.edu.co. ORCID: 00000003-1178-1917. Application of Micro-Raman Spectroscopy for the Quantitative Analysis of Vitrinite Reflectance in Medium and High Rank Colombian Coals Revista Facultad de Ingeniería (Rev. Fac. Ing.) Vol. 29 (54), e12241. 2020. Tunja-Boyacá, Colombia. L-ISSN: 0121-1129, e-ISSN: 2357-5328, DOI: https://doi.org/10.19053/01211129.v29.n54.2020.12241 0.7 μm for the anthracite, semi-anthracite and bituminous samples, respectively. The results showed that based on this method, it was possible to obtain a model that allows to rapidly analyze and characterize the coal. The results compare very well to those of Colombian coals normalized by other methods to improve the precision of the measurement. The modified method, however, did not offer an appropriate fit for the lower range coal and produced extremely low reflectance values. This effect is possibly related with the molecular structure of organic matter in coal or the presence of fluorescence interference.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"11 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84837986","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":"Numerical Study of a Helical Heat Exchanger for Wort Cooling in the Artisanal Beer Production Process","authors":"Fernando Toapanta-Ramos, L. González-Rojas, E. Calero, Bryan Calderón, W. Quitiaquez","doi":"10.19053/01211129.V29.N54.2020.11632","DOIUrl":"https://doi.org/10.19053/01211129.V29.N54.2020.11632","url":null,"abstract":"The objective of the present work is to study the behavior of a helical tube and shell heat exchanger, for the cooling of the wort in the process of making craft beer with cold water, through the methodology of computational fluid dynamics (CFD) by finite volume models for heat exchanger modeling. This by using the ANSYS Fluent software, which allows to understand the behavior of the fluid through equations that describe their movement and behavior, using numerical methods and computational techniques. In the mesh convergence, two methods were used, orthogonality and obliquity, with which it was confirmed that the meshing is ideal in the simulations that were carried out. For the simulation, the k-epsilon turbulence model and the energy model were used. Through various simulations, it was obtained that by varying the mass flow, better results are reducing the outlet temperature, with a variation of 15.16 °C, while varying the inlet temperature of the water, there is just a variation 1 M. Sc. Universidad Politécnica Salesiana (Quito, Ecuador). ltoapanta@ups.edu.ec. ORCID: 0000-0002-0838-4702 2 Universidad Politécnica Salesiana (Quito, Ecuador). lgonzalezr1@est.ups.edu.ec. ORCID: 0000-0001-65734353 3 Universidad Politécnica Salesiana (Quito, Ecuador). ecalerp@est.ups.edu.ec. ORCID: 0000-0001-5595-5005 4 Universidad Politécnica Salesiana (Quito, Ecuador). bcalderons@est.ups.edu.ec. ORCID: 0000-0002-86023099 5 M. Sc. Universidad Politécnica Salesiana (Quito, Ecuador). wquitiaquez@ups.edu.ec. ORCID: 0000-00019430-2082 Numerical Study of a Helical Heat Exchanger for Wort Cooling in the Artisanal Beer Production Process Revista Facultad de Ingeniería (Rev. Fac. Ing.) Vol. 29 (54), e11632. 2020. Tunja-Boyacá, Colombia. L-ISSN: 0121-1129, e-ISSN: 2357-5328, DOI: https://doi.org/10.19053/01211129.v29.n54.2020.11632 from 2.71 °C to 0.01 °C. Therefore, a significant improvement in the performance of the heat exchanger was found. In the same way, it was confirmed that the number of spikes in the heat exchanger is adequate, since the outlet temperature would not be reached with less spikes.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"2 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2020-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78631185","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":"Learning about Programming and Epistemic Emotions: A Gendered Analysis","authors":"Beatriz Eugenia Grass, M. Coto, César A. Collazos-Ordóñez, P. Paderewski","doi":"10.19053/01211129.v29.n54.2020.12034","DOIUrl":"https://doi.org/10.19053/01211129.v29.n54.2020.12034","url":null,"abstract":"Programming courses often turn into courses with high percentage of desertion and, sometimes, result in a factor that drives students to abandon their careers, even when they are subjects highly relevant in the training of engineers in the areas of computer science, IT, and related careers. These courses demand high cognitive processes, which generate several emotions learning-related that, when taken into account and evaluated, could be used in favor of learning. Programming courses generate negative emotions in female students in a higher proportion than men, which may even lead them to abandon the career, widening the gender gap. In recent years, there has been a growing interest in the role of emotions in academic environments at university level, as well as for knowing the reason for the low participation of women, despite the importance of their role and skills, in computing areas. However, the interest in analyzing the emotions that emerge from students as they learn to program is quite recent. There is not an important number of studies around the emotions of women while they learn to program. The objective of this study is to analyze the behavior -at an emotional levelof students towards different 1 M Sc. Universidad de San Buenaventura (Cali-Valle del Cauca, Colombia). ORCID: 0000-0002-7118-2038 2 Ph. D. Universidad Nacional de Costa Rica (Heredia, Costa Rica). mcoto@una.ac.cr. ORCID: 0000-00024558-3671 3 Ph. D. Universidad del Cauca (Popayán-Cauca, Colombia). ccollazo@unicauca.edu.co. ORCID: 0000-00027099-8131 4 Ph. D. Universidad de Granada (Granada, España). patricia@ugr.es. ORCID: 0000-0001-6626-9633 Learning about Programming and Epistemic Emotions: A Gendered Analysis Revista Facultad de Ingeniería (Rev. Fac. Ing.) Vol. 29 (54), e12034. 2020. Tunja-Boyacá, Colombia. L-ISSN: 0121-1129, e-ISSN: 2357-5328, DOI: https://doi.org/10.19053/01211129.v29.n54.2020.12034 teaching activities, establishing gender level comparisons, and considering the incorporation of elements of collaboration and gamification to identify differences in the emotions originated by these activities.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2020-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79920353","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":"Effect of the Harmonic Voltage Distortion on the Efficiency of a Compact Fluorescent Lamp","authors":"Esteban Rojas-Osorio, A. Saavedra-Montes, C. Ramos-Paja","doi":"10.19053/01211129.v29.n54.2020.11604","DOIUrl":"https://doi.org/10.19053/01211129.v29.n54.2020.11604","url":null,"abstract":"This paper evaluates the effect of the voltage harmonic distortion over the efficiency of a compact fluorescent lamp that is fed with a constant RMS voltage and constant frequency. Several works have been published about the assessment of compact fluorescent lamps, but the effect of the voltage distortion over the efficiency is still an open topic. This work focuses on designing an experiment to estimate the efficiency of a compact fluorescent lamp while changing the voltage harmonic distortion of the power supply. First, a mathematical model that represents a bus susceptible to harmonic distortion (high impedance) that feeds the compact fluorescent lamp is analyzed. Then the mathematical model is reproduced through a test bench in a laboratory of rotating electrical machines. The test bench produces a three-phase bus with constant voltage and frequency, and variable voltage harmonic distortion. The compact fluorescent lamp is subjected to varying harmonic voltage distortion while recording its electrical variables and the produced lumens to estimate its efficiency. That is a practical approach to calculate the lamp efficiency while several 1 Universidad Nacional de Colombia (Medellín-Antioquia, Colombia). earojas@unal.edu.co. ORCID: 0000-00025385-3328 2 Ph. D. Universidad Nacional de Colombia (Medellín-Antioquia, Colombia). ajsaaved@unal.edu.co. ORCID: 0000-0002-2529-5082 3 Ph. D. Universidad Nacional de Colombia (Medellín-Antioquia, Colombia). caramosp@unal.edu.co. ORCID: 0000-0003-2231-4177 Effect of the Harmonic Voltage Distortion on the Efficiency of a Compact Fluorescent Lamp Revista Facultad de Ingeniería (Rev. Fac. Ing.) Vol. 29 (54), e11604. 2020. Tunja-Boyacá, Colombia. L-ISSN: 0121-1129, e-ISSN: 2357-5328, DOI: https://doi.org/10.19053/01211129.v29.n54.2020.11604 works limit their scope measuring only the efficiency of the input converter. The experimental results show that a variation of the voltage harmonic distortion of 8 % on a compact fluorescent lamp reduces its efficiency. Those results put into evidence the importance of regulating harmonic distortion limits to reduce or prevent the increment of power losses caused by harmonic components.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"3 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79747354","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":"SOPHIA: System for Ophthalmic Image Acquisition, Transmission, and Intelligent Analysis","authors":"O. J. Perdomo-Charry, Andrés Daniel Pérez-Pérez, Melissa De-la-Pava-Rodríguez, Hernán Andrés Ríos-Calixto, Víctor Alfonso Arias-Vanegas, Juan Sebastián Lara-Ramírez, Santiago Toledo-Cortés, Jorge Eliecer Camargo-Mendoza, F. Rodríguez-Alvira, Fabio Augusto González-Osorio","doi":"10.19053/01211129.V29.N54.2020.11769","DOIUrl":"https://doi.org/10.19053/01211129.V29.N54.2020.11769","url":null,"abstract":"Citation: O.-J. Perdomo-Charry, A.-D. Pérez, M. de-la-Pava-Rodríguez, H.-A. Ríos-Calixto, V.-A. Arias-Vanegas, J.-S. Lara-Ramírez, S. Toledo-Cortés, J.-E. Camargo-Mendoza, F.-J. Rodríguez-Alvira, F.-A. González-Osorio, “SOPHIA: System for Ophthalmic Image Acquisition, Transmission, and Intelligent Analysis,” Revista Facultad de Ingeniería, vol. 29 (54), e11769, 2020. https://doi.org/10.19053/01211129.v29.n54.2020.11769","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2020-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88234362","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":"Simulation of methanol production from residual biomasses in a Cu/ZnO/Al2O3 packed bed reactor","authors":"Carlos Esteban Aristizábal-Alzate, A. Vargas-Ramírez, P. N. Alvarado-Torres","doi":"10.17533/UDEA.REDIN.20200907","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.20200907","url":null,"abstract":"This article aims to simulate an algorithm constructed in MATLAB to represent the catalytic conversion of SYNGAS into methanol in a packed-bed reactor, based on chemical kinetics for a heterogeneous system with a Cu/ZnO/Al2O3 as a catalyst, and complementary math and phenomenological models, as a pressure drop and catalyst deactivation. Model validation is developed, comparing reference results and the results by running the algorithm in MATLAB using a reference SYNGAS composition. Also, the constructed model considers a catalyst deactivation by sintering and pressure drop along the reactor. Several parameters were evaluated to identify the pro conditions for methyl alcohol production; these parameters include the gasifying agent selection, the biomass and steam ratio effect, and the biomass origin. RESUMEN: El objetivo de este artículo es simular un algoritmo construido en MATLAB para representar la conversión catalítica de SYNGAS en metanol en un reactor de lecho empaquetado, basados en la cinética química para un sistema heterogéneo con un Cu/ZnO/Al2O3 como catalizador, y en modelos matemáticos y fenomenológicos, como caída de presión y desactivación del catalizador. Se realiza una validación del modelo, comparando los resultados de referencia y los resultados obtenidos al ejecutar en el algoritmo MATLAB la composición de referencia SYNGAS. Además, el modelo construido considera una desactivación del catalizador por sinterización y caída de presión a lo largo del reactor. Se evaluaron varios parámetros para identificar las condiciones para la producción de alcohol metílico; Estos parámetros incluyen la selección del agente gasificante, el efecto de la relación de biomasa y vapor y el origen de la biomasa. C. E. Artistizábal, A. F. Vargas and P. N. Alvarado. ”Simulation of methanol production from residual biomasses in a Cu/ZnO/Al2O3 packed bed reactor”, Revista Facultad de Ingeniería Universidad de Antioquia, no. 102, pp. 115-124, Jan-Mar 2022. [Online]. Available: https: //www.doi.org/10.17533/ udea.redin.20200907 ARTICLE INFO: Received: November 28, 2019 Accepted: September 23, 2020 Available online: September 23, 2020","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"73 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2020-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83744204","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}