Revista Ingenierías Universidad de Medellín <p>ISSN (print): <strong>1692-3324</strong> | ISSN (online): <strong>2248-4094</strong> |&nbsp;DOI:&nbsp;<strong><a href="">10.22395/rium</a><br></strong></p> <p><em>Revista Ingenierías Universidad de Medellín</em> - RIUM -&nbsp;&nbsp;is a scientific and technical journal with semiannual periodicity. We publish high-quality papers in different fields of engineering,&nbsp;according to accepted standards for its kind.</p> <p>&nbsp;</p> en-US <p>The total or partial reproduction of the contents of the journal for educational, research, or academic purposes is authorized as long as the source is cited. For reproduction for other purposes, express authorization from the Sello Editorial Universidad de Medellín is required.</p> (Fredy López-Pérez, Ph.D.) (Laura A. Calle) Mon, 22 Feb 2021 20:11:19 +0000 OJS 60 Estimación de los parámetros del modelo de un solo diodo del módulo fotovoltaico aplicando el método de optimización basado en búsqueda de patrones mejorado. <p>In this article, we propose the use of the optimization algorithm based on improved pattern search (IPSM), applying it to the estimation of the model parameters of a single diode of a photovoltaic cell. The parameters to be estimated are the photovoltaic current, the saturation current of the diode, the series resistance, the resistance in parallel, and the ideality factor of the diode. The estimation is made from the data obtained from a known curve, that is to say, that a photovoltaic cell could be characterized and from the data of the curve the parameters are extracted. The results are the identification of the parameters and the accuracy of the model concerning the reference at the point of maximum power (MPP). Additionally, a comparison is made with the model obtained with three estimations made with the particle swarm optimization algorithm (PSO), under the same conditions in the number of particles and iterations. The error found shows the similarity of the model with the reference obtained using the IPSM algorithm.</p> Andres Felipe Tobon Mejia Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Mon, 20 Apr 2020 17:47:08 +0000 Smart Campus at the Universidad Militar Nueva Granada: Creation of Base Map and Applications for Campus Tree Monitoring <p>The GIS smart campuses have been constituted as an efficient system that allows the integration of information from different agencies inside universities, with the use of geographic applications developed for different types of users. This research describes general considerations to begin implementation of a smart GIS at the Nueva Granada Campus, in Cajicá. This phase was developed based on the generation of a campus base map, which is used as a spatial reference for the elaboration of all applications that require associated geographic information, as well as the implementation of a Gisweb system for the monitoring, verification, and updating of the campus trees. The result of the work provides the basis for subsequent systems and applications of location, mobility and efficacy management related with the academic and administrative activities in the university campus.&nbsp;</p> Elsa Adriana Cárdenas Quiroga Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Mon, 04 May 2020 00:00:00 +0000 Finite Element Analysis of an Evaporation System to Synthesize Kesterite Thin Films <p>Currently, there is an interest within the scientific community in thin-film solar cells with a Kesterite (Cu<sub>2</sub>ZnSnS<sub>4</sub>) type absorber layer, since they report a theoretical efficiency greater than 32%. The synthesis of Kesterites by evaporation has allowed for efficiencies at the laboratory level of 11.6%. Although these are good results, the design of the evaporation chamber and the distribution of the electrodes is important to control synthesis parameters and evaporate each precursor in the corresponding stage. This project seeks to design an evaporation chamber that can achieve a vacuum of 10<sup>-5</sup> mbar, increase the deposition surface, and avoid each precursor evaporation in a non-corresponding stage. This last objective was studied using COMSOL multiphysics R. (licensed product) software, with the adequate disposition of metallic precursors (zinc, copper, and tin) determined by analyzing heat distribution. It was concluded that the lower the evaporation temperature of the precursor, the height of the copper electrode in the system must be lower. This is because with a lower height the concentration of heat in the container is lower. This article is classified as a research result and its financing was made by Universidad Industrial de Santander.</p> Carlos Eduardo Rondón Almeyda, Monica Andrea Botero Londoño, Rogelio Ospina Ospina Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Wed, 06 May 2020 15:53:48 +0000 SELECTION OF ONLINE NETWORK TRAFFIC DISCRIMINATORS FOR ON-THE-FLY TRAFFIC CLASSIFICATION <p>There are several techniques to select a set of traffic features to perform traffic classification. However, most studies ignore the domain knowledge where traffic analysis or classification is performed and do not consider that the information carried in the networks is always moving. This paper describes a selection process of online network traffic discriminators, obtaining 24 traffic features that can be processed on the fly, and proposes them as a set of base attributes for future domain aware online analysis, processing or classification. For the selection of a set of traffic features, and to avoid inconveniences mentioned, we carried out three steps. The first step is a context knowledge based manual selection of traffic attributes that meet the condition of being obtained on the fly of the flow. The second step is focused on the quality analysis of previously selected attributes to ensure the relevance of each one when performing a traffic classification. In the third step, the usefulness of the discriminators in online traffic classification processes is verified by implementing several incremental learning algorithms.</p> Angela María Vargas Arcila, Juan Carlos Corrales Muñoz, Alvaro Rendon Gallon, Araceli Sanchis Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 23 Jun 2020 21:02:17 +0000 Extraction of Student Interaction Data from an Open edX Platform <p>The Massive Open Online Courses (MOOC) are courses available to the general public without restrictions that are offered to hundreds or thousands of students and in recent years have been presented as a revolution in online education. They are presented as an alternative to the great demand in higher education for the characteristic of being open and massive because they allow access to education to a huge number of students. They have become an ideal environment for data collection and through the application of learning analytics techniques they have allowed a better understanding of how students learn. However, access to the data from thecurrent open-source MOOC platforms is limited and often difficult to collect and process. This paper presents a proposal for collecting and processing the data from students’ interaction with the Open edX platform through Scripts and a Collector based on Java code.&nbsp;</p> Daniel Jaramillo-Morillo, Mario Solarte, Gustavo Ramírez-González Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 00:00:00 +0000 ICTS USE, SINCE AN INTERDISCIPLINARY APPROACH FOR SUPPORT THE TRAINING ON OPHIDIMS, A PUBLIC HEALTH PROBLEM 1 <p>The present research and development work focuses on ophidism or ophidic accident<br>that is a forgotten public health problem, which is normally focused on antiophidic serum<br>application. Complications are sometimes caused by the patients; delay to go to a<br>medical centre and the health professionals lacking knowledge of the ophidism<br>treatment. In this work, we design under canvas model a Massive Open Online Course<br>(MOOC) on introduction to ophidic accident giving a new accessible, massive and<br>dynamic training strategy. It is nourished by the students’ contribution; unlike traditional<br>training programmes. For this reason, it is intended to promote other forms of training on<br>prevention and knowledge of the ophidic accident, which are priority activities in the<br>Colombian territory. To end, we highlight that there exist a considerable number of<br>underestimated cases due to the inadequate registration of the notification forms.</p> Jimmy Alexander Guerrero Vargas, Angie Marcela Rengifo Rios , Mary Luz Bueno Ospina, Santiago Ayerbe González, Luis Alejandro Cruz Ordóñez Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 21:51:34 +0000 SCAFFOLDING SYSTEM FOR SOLVING PROBLEMS IN ENGINEERING EDUCATION <p>The demands of today's world have induced necessary changes in education curricula, teaching methods, modernization of learning scenarios, pedagogies, didactics, among others. Students now require learning scenarios where they can interact with knowledge directly; turning them into active agents within their training process, capable of solving problems. The main purpose of this research is to evaluate a system of contextual awareness as learning scaffolding in problem solving activities in first semester students of systems engineering, in order to analyze the effect on academic performance and students’ participation in solving problems. Results show that students who had access to the context awareness system as scaffolding for learning had better scores.</p> Jorge Gómez Gómez, Helman Hernández Riaño, Velssy Hernández Riaño Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 21:52:36 +0000 Architecture proposal for MOOC and wearable integration <p>Conference Derivative Article. Every day, people need to be trained, either to complement their professional skills or because of personal interests that lead to their well-being. Online education, especially MOOC and SPOC are good alternatives for carrying out continuing educational processes, but are not enough when it comes to learning motor skills. This paper shows a research approach on how MOOC can expand its functionalities so that it can be applied to learning motor skills. It also proposes the development of a project to integrate three components: the integration component, the wearable component and the open edX component for the future development of a "salsa" course. Finally, it proposes an architecture based on the 4+1 view model, where the functionality in different areas of the design is shown.</p> Marlon-Felipe Burbano-Fernandez Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 21:53:37 +0000 ICT and Educational Innovation: Demands and Expectations <p>In the development of the research project "Strengthening and expanding the coverage of postgraduate training in Educational Innovation with ICTs through virtual education strategies relevant to the socio-cultural context of the region", the meaning of Educational Innovations for teachers was investigated. Through 7 focus groups, with the participation of 168 teachers from urban and rural schools, public and private schools, as well as teachers in training, schoolteachers and university professors, from 3 different departments in southwestern Colombia, it was identified, through the use of the grounded theory analysis method, that teachers associate educational innovations with changes in the way they teach in their classes. In this way, the incorporation of ICTs is seen as important, since it facilitates teaching processes, motivates learning and improves the quality and pertinence of education.</p> Mary Cristina Carrascal, emigdio andres lara silva, Ivan Eduardo Hernández , Ulises Hernández Pino Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 21:55:34 +0000 LexRank with threshold to identify EF-ISF navigation patterns in xMOOC of Open edX <p>Abstract: The use of the Open edX platform to offer xMOOC courses by different Universities in the world, has led to a growth in the participation of students in the courses, thus generating a set of navigation patterns when interacting with the xMOOC which are recorded in the tracking.log file. So far there is no study that identifies EF-ISF navigation patterns of the set of patterns, for this reason in this document propose the use of the LexRank with Threshold algorithm for the identification of the EF-ISF navigation patterns.</p> Fabián Andrés Ancona Anacona, Mario Fernando Solarte Sarasty, Gustavo Adolfo Ramírez González Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 21:58:32 +0000 COFFEE FUN, gamified tool based on agile development methodology SUM for videogames <p>In recent years serious games have been applied in different contexts of application, highlighting the contribution in the educational context<strong>. </strong>This original type article presents the design, construction and evaluation of the Coffe Fun video game. Coffe Fun is a video serious game aimed at children aged 8 to 12 years old, the game has a theme of growing coffee bean in a simulation environment in which each player helps the growth of this plant by a few tools provided at each level of the game; in this scenarios related to coffee growing environments are presented for each of its stages in a series of levels that the player must overcome to complete the game through a process of learning and entertainment.</p> Gabriel Elías Chanchí Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 21:59:23 +0000 MSMEs Co-Creation Model: Case Study in the Dairy Sector of Bogotá, Colombia <p class="Abstract">Las Micro y pequeñas empresas en Colombia requieren fortalecer sus ventajas competitivas, sostenibles y sustentables para responder, adaptar y sostenerse en el mercado; deben concentrar sus esfuerzos en la gestión del conocimiento, la innovación las TICs, el mejoramiento continuo, y la Co-Creación.</p> <p class="Abstract">En este documento presenta un modelo de Co-creación basado en gestión de conocimiento que permita innovar en el sector lácteo, como forma de adaptación y supervivencia, de diferenciación y competitividad como herramienta para la toma de decisiones.</p> Giovanny Mauricio Tarazona Bermudez, Olga Alexandra Rodríguez Chala, Lillyana María Giraldo M Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Wed, 15 Jul 2020 22:04:31 +0000 Minimización del makespan para el problema de máquinas paralelas no relacionadas con tiempos de setup dependientes de la secuencia mediante un algoritmo híbrido VND/ACO Se propone una heurística híbrida VND/ACO para resolver el problema de programación de máquinas paralelas no relacionadas con tiempos de preparación dependientes de la secuencia con el objetivo de minimizar el makespan. La búsqueda en entornos variables se propone con un esquema descendente resolviendo en una primera etapa el problema de programación de los trabajos a las máquinas a través de VND, y luego, en una segunda etapa, se aplica un algoritmo ACO, reordenando sucesivamente los trabajos en la máquina de mayor makespan. Se realizan pruebas experimentales sobre un conjunto de problemas de prueba de la literatura, mostrando que al aplicar la segunda etapa de la metaheurística propuesta se mejoran las soluciones obtenidas en la primera etapa del algoritmo. También se comparan los resultados obtenidos con otros métodos de la literatura, resultando ser un método competitivo. Eduardo Javier Salazar-Hornig, Gina Andrea Soto Gavilán Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Thu, 22 Oct 2020 14:46:49 +0000 RURAL B-LEARNING CONTEXTS TO SUPPORT THE AREA PHYSICS - A PERFORMANCE OF ACADEMICS ANALYSIS <p>In this work, the academic performance of a tenth-grade physics course of higth school is analyzed over three consecutive years, a b-Learning educational context is configured in a rural area based on by a framework that integrates Open Educational Resources to an LMS . The performance of students who used b-learning is compared to other groups that received the same classes in a traditional way.</p> Fabinton Sotelo Gomez, Mario Solarte, Gustavo Ramirez González Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 00:00:00 +0000 Methodological approach and technological framework to produce a Massive Open Online Course (MOOC) in biodegradable packing. <p><span style="font-weight: 400;">This article shows the different stages used for the design and production of a MOOC for biodegradable packing, the planning tools and methodologies used for the development of the themes and contents. Likewise, is shown the technological framework used making a surveillance technology to identify which stage the MOOC e-learning tech is and the search of terms related to biodegradable packing to identify potential topics. Finally, the software architecture for SELENE is explained and how is deployed in open edX platform. </span></p> Anabel Guzman Ordoñez, Carlos León Casanova , Héctor Samuel Villada Castillo, Jhon Jairo Palechor Tróchez, Carlos León Roa Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 00:00:00 +0000 Recommendation systems in education: A review of recommendation mechanisms in e-learning environment <p>In recent years, new trends and methodologies have emerged that greatly favor the education sector, e-learning as an alternative to regular teaching and learning processes has transformed the educational dynamics thanks to the inclusion of MOOCs, personal learning environments, allowing the educational process to be carried out at a personalized level where the focus is on learning styles and the profile of the student. This article presents a review of current works around machine learning mechanisms to make recommendations in the educational environment, where it is found that besides the discovery of the student’s learning style, it is important to know their level of knowledge and learning speed, in addition to the tools used by the student to carry out their studies. Finally, the opportunity for implementation and research of these issues in Colombia is highlighted</p> Paola Andrea Otero Cano, Edgar Camilo Pedraza Alarcón Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 00:00:00 +0000 A MOOC for farmers: agroclimatic tools for crop protection <p>Massive open online courses (MOOCs) are a key strategic for the digital education. The MOOCs contribute significantly to people’s knowledge about a wide range of topics. Nowadays, several web platforms as Coursera and edX offer MOOCs in different domains, however the platforms mentioned do not offer MOOCs focused on crop management through monitoring of climate elements and factors. In this paper, we present an overview of the MOOC titled: “agroclimatic tools for crop protection” for agricultural-sector Spanish speakers. We show a first MOOC evaluation based on a survey applied to 13 people of rural areas located in Cauca (Colombia) for one video of the MOOC unity “Temperature”. The results indicated that 100% of the respondents understood clearly the video content and 53.84% of the surveyed learners understood all the words used in the video.</p> David Camilo Corrales, Apolinar Figueroa Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 00:00:00 +0000 Challenges in the transformation of a face-to-face dance course into a MOOC course. <p><em>This article presents the experience in the design of the course "Folkloric dance as cultural heritage" to be offered under the modality "massive online course". It shows the main challenges faced in the exercise of the integration of two face-to-face courses, one practical and one theoretical, and its process of transformation into a MOOC. The course was designed for two academic credits with six hours of dedication per week and is offered to the community of the University of Cauca as an elective subject of the component of Integral Social and Human Formation FISH, through a space in the MOOC Open edX platform. This integration process of the face-to-face courses and their transformation into a MOOC brought with it several challenges related to the adjustment of contents, academic activities and the evaluation. This article presents how these challenges were faced in this experience.</em></p> Angela Rocio Chantre Astaiza, Claudia Patricia Burbano Astaiza, Mario Fernando Solarte Sarasty Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Tue, 14 Jul 2020 00:00:00 +0000 Assessing the Vulnerability of Power Systems Using Multilevel Programming: A Literature Review <p class="Abstractandkeywordscontent" style="line-height: 200%;"><span lang="EN-US" style="font-size: 12.0pt; line-height: 200%; font-family: 'Arial',sans-serif;">Vulnerability studies in power systems allow to identify critical elements, in order to take protective measures against scenarios that may lead the system to load shedding. These scenarios can be caused by natural events or deliberate attacks. This paper presents a literature review for the latter case, which is known as the interdiction problem. In this problem, it is assumed that there is a disruptive agent whose objective is to maximize the damage to the system, while the network operator acts as a defensive agent. The non-simultaneous interaction of these two agents results in a multilevel optimization problem. Various interdiction models and solution methods have been reported in the technical literature; as a main contribution, this paper presents the considerations to be taken into account when analyzing, modeling and solving the interdiction problem including the main solution techniques, the applied methodologies and future research. In the literature review, it was found that a large part of the studies focuses on the analysis of transmission systems considering linear network approximations. On the other hand, few interdiction studies use the AC model of the network or directly address distribution networks from a multilevel perspective. Future challenges in this research field lie in modeling and incorporating new defense strategies for the network operator such as the use of distributed generation, demand response and the topological reconfiguration of the system.</span></p> Jesus Maria Lopez-Lezama, Juan Pablo Hernandez Valencia, Bonie Johana Restrepo Cuestas Copyright (c) 2020 Revista Ingenierías Universidad de Medellín Fri, 31 Jul 2020 00:00:00 +0000