Revista Ingenierías Universidad de Medellín
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Vol 20, No 39 (2021): July-December
PublishedNovember 27, 2021
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-ALL- Articles
ICTs use since an interdisciplinary approach for support the training on ophidism a public health problem
Jimmy Alexander Guerrero Vargas, Angie Marcela Rengifo Rios , Mary Luz Bueno Ospina, Santiago Ayerbe González, Luis Alejandro Cruz Ordóñez
Online date: 2019-10-08 00:58:12
DOI https://doi.org/10.22395/rium.v20n39a1
Jimmy Alexander Guerrero Vargas, Angie Marcela Rengifo Rios , Mary Luz Bueno Ospina, Santiago...
The present research and development work focuses on ophidism or ophidic accident
that is a forgotten public health problem, which is normally focused on antiophidic serum
application. Complications are sometimes caused by the patients; delay to go to a
medical centre and the health professionals lacking knowledge of the ophidism
treatment. In this work, we design under canvas model a Massive Open Online Course
(MOOC) on introduction to ophidic accident giving a new accessible, massive and
dynamic training strategy. It is nourished by the students' contribution; unlike traditional
training programmes. For this reason, it is intended to promote other forms of training on
prevention and knowledge of the ophidic accident, which are priority activities in the
Colombian territory. To end, we highlight that there exist a considerable number of
underestimated cases due to the inadequate registration of the notification forms.
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Scaffolding system for solving problems in engineering education
Jorge Gómez Gómez, Helman Hernández Riaño, Velssy Hernández Riaño
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.
Architecture proposal for MOOC and wearable integration
Marlon-Felipe Burbano-Fernandez
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.
ICT and Educational Innovation: Demands and Expectations
Mary Cristina Carrascal, Emigdio Andrés Lara Silva, Ivan Eduardo Hernández , Ulises Hernández Pino
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.
LexRank with threshold to identify EF-ISF navigation patterns in xMOOC of Open edX
Fabián Andrés Ancona Anacona, Mario Fernando Solarte Sarasty, Gustavo Adolfo Ramírez González
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.
Monitoring of Earth's Crust Movements Associated to Earthquakes through GPS Observations in the Gulf of California
Rosendo Romero-Andrade, Manuel Edwiges Trejo-Soto, Alonso Alejandro Arellano-Baeza, Juan Luis Cabanillas-Zavala
Rosendo Romero-Andrade, Manuel Edwiges Trejo-Soto, Alonso Alejandro Arellano-Baeza, Juan Luis...
The distribution of the velocities of the Pacific and North American plates and their possible alteration by earthquakes has been studied using the GPS continuous measurements in the lapse from 2010 to 2016. The GPS data were processed with GAMIT/GLOBK to estimate the position and velocity of the continuous stations. Subsequent analysis has shown that the average relative movement between the Pacific and North American plates is consistent with previous studies, estimating 7.33 mm/year for the north component, and -9.50 mm/year for the east component with an absolute value of 500 mm/yr. A possible relationship between sudden changes in velocity associated with coseismic events and a trend indicates that the probability of having an earthquake of magnitude Mw ≥ 5.0 increases with an increase of the relative velocity between plates is presented.
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A Look at Algorithm BEPtoPNST
Juan Carlos García Ojeda
This work analyzes the computational complexity of algorithm BEPtoPNST which transforms a building-evacuation problem (BEP) into a time-ex-panded, process-network synthesis (PNST) problem. The solution of the latter is achieved by resorting to the P-graph method which exploits the combinatorial nature of a BEP. Unlike other approaches, the P-graph method provides not only the optimal solution (best evacuation route as a function of egress time), but also the best n sub-optimal solutions. For the complexity analysis, a generic processor, and a Random-access machine (RAM) model were deployed as well as a mathematical model to calculate the number and cost of the operations performed. It was observed that algorithm BEPtoPNST exhibits an asymptotic complexity of order O ( T | A | (| N | –k)). When solving a BEP, however, the total complexity grows exponentially with order O (T | A | (| N | –k)) + O (2h)) in the worst case; where h represents the total number of operating units specified in the corresponding PNST problem. Nevertheless, the computational comple-xity can be reduced significantly when the P-graph method is deployed.
Monitoring of Fine Particulate Matter and Black Carbon, in Micro-Environments of Manizales Andean City: Pilot Study
Angel David Gálvez Serna, Carlos Mario González Duque, Juan Felipe Franco Ramírez, Ricardo Morales Betancourt, Juan Manuel Rincón Riveros, Beatriz Helena Aristizábal Zuluaga
Angel David Gálvez Serna, Carlos Mario González Duque, Juan Felipe Franco Ramírez, Ricardo...
Manizales has an air quality network which measure particulate matter (PM) in ambient air concentrations. However, this monitoring system does not have information of pollutant concentrations in the vicinity of roads. The objective of this study was to determine the concentration of the fine parti-culate matter (PM2.5) and black carbon (BC) near main roads of Manizales. The evaluation considered micro-environments related with pedestrians of roads and passengers of public transport buses. PM2.5 and BC concen-trations were measured during two weeks for periods of five hours per day in the morning. The instruments used were two DustTrack photometers (model 8533) and a Microethalometer model AE51. The data were analyzed according to each micro-environment and three different zones of the city.
The median values of PM2.5 and BC concentrations were 10 % and 30 % lower in the eastern zone than in the center zone, showing the impact of vehicular emissions in ambient air concentrations. In public transport buses, the median of PM2.5 and BC concentrations were 57 % and 54 % higher than those obtained near roads. In terms of inside the public trans-port buses micro-environment, the contribution of BC was approximately 41 % of the total PM concentrations. This is the first study performed in Manizales in which concentrations of fine particles and BC near roads and public transport (pedestrians and passengers) were evaluated. These types of studies are important for adding new information for air quality management in the city and for complementing the official air quality monitoring.
Thermal Characteristics of TIO2 Nanocomposite in a Polyurethane Matrix Made with Castor Oil
Fernando Gordillo Delgado, Hector Hernán Hernández Zarta
Nanocomposites are multiphase structures with at least one phase dimension of nanometric order size. Polymer-based materials mixed with low proportions of titanium dioxide nanoparticles (NPs-TiO2) present a versatile alternative in different industrial applications, considering the optimization of mechanical and thermal properties with respect to pure polymers and conventional materials. In this work, the synthesis and measurement of thermal characteristics of a nanocomposite formed by NPs-TiO2, 5 nm particle size Anatase phase, in a polyurethane matrix, made with castor oil is reported. The polymeric matrix was obtained through the reaction between the self-condensation of castor oil and diphenylmethane diisocyanate (MDI), while in the synthesis of NPs-TiO2 the sol-gel technique was used, using as precursor titanium (IV)-bis(acetylacetonate) diisopropoxide. The specific heat (Cp) of the samples was measured by means of the thermal relaxation method and the thermal diffusivity was determined with the photoacoustic technique (α). Cp of the nanocomposite increased by 12.98 % due to addition of the NPs, while α decreased by 98.63 %, compared to the corresponding values of the polyurethane matrix. With a concentration of 3 wt % of NPs-TiO2 in the matrix, these thermal parameters were found to be below the average values of conventional plastics.
Drying kinetics of organic parchment coffee beans (Coffea arabica L.) using microwave fluidised bed: Semi-theoretical modeling
Marcelo Fernando Valle Vargas, Ricardo Durán Baron, Jader Alean , Héctor J. Ciro Velasquez
DOI https://doi.org/10.22395/rium.v20n39a10
The aim of this study was to model the drying kinetics of microwave and fluidised bed of parchment coffee bean (Coffea arabica L.) using a semi-theoretical approach. A completely randomized design with six treatments: three with microwave drying (MD) and the rest combined with fluidized bed drying (MFBD) was carried out. The drying curves were established until reaching a final moisture content between 10 to 12% w.b. The results indicated that the drying time decreased as the microwave power level increased. When MFBD was used, drying times increased approximately 4-fold compared to MD treatments. The values of effective diffusivity for coffee beans treated with MD and MFBD ranged from 0.913 to1.72×10-9 m2.s-1 and 0.23 to 0.42×10-9 m2.s-1, respectively. Although all the models presented high goodness of fit, the two-term model presented the highest R2 (0.9855 – 0.9978) and lowest RMSE (0.0128-0.0285). In general, all models adequately fitted the experimental data so they can be used to predict the drying kinetics, therefore they could be very useful in equipment design and optimization of the coffee drying process.
Dynamic simulation of a R,S stock politic of hardware supply chain
Andrés Mauricio Paredes Rodríguez, Juan Carlos Osorio Gómez
DOI https://doi.org/10.22395/10.22395/rium.v20n39a11
Nowadays, stock management became a strategic decision used by organizations due to the high impact it has on the overall performance of supply chains. This paper evaluates the impact of the implementation of a R, S inventory policy in the finances of a distribution network. The research involves the functioning of a hardware supply chain conformed by a retailer and a manufacturer, which is simulated trough system dyna- mics. The main results of the study validate the positive impact that the policy about network liquidity have. Likewise, it is possible to determine the dominance of parameters such as demand, the review period and the maximum production capacity over the overall performance of the system.
Analysis of Financial Indicators in Bidding Processes in Colombia
Miguel David Rojas Lopez, Susana María Valencia, Luis Miguel Jiménez Gómez
State contracting is the mechanism by which public resources are invested in order to meet government objectives focused on collective progress. The primary objective of bidding processes is to ensure stakeholder participation in public procurement processes, allowing competition among bidders, as long as plurality is guaranteed.
In Colombia, the state contracting process is regulated by Law 80-1993, which provides rules and principles that govern contracts of state entities. One of the stages to participate in bidding processes is the fulfillment of enabling financial capacity requirements which should show solidity in the organizations to continue the selection process. Bearing in mind that each contracting entity has the autonomy to draft the requirements presented in the bidding document, including the value requested for compliance with the financial indicators, an alert is presented on the possibilities of corruption that threaten State resources, which can be explained by the fact that most of the bidding documents are complex or clearly directed, raising the problems of investigation and the need to analyze the possibility of compliance with the requirements of financial capacity in the bidding processes analyzed in 2017 in the Land, Buildings, Structures and Roads segment.
The research derived article begins with an introduction to the problems and impor- tance of the market for public goods and services, and then illustrates the reader with current regulations for state contracting in Colombia, starting the current public bids for 2017. After generating contextualization, the enabling requirements of financial capacity, which is the object of study ,are presented. Qualitative methodology is used for the bibliometric analysis and characterization of the bidding processes and finally quantitative analysis is carried out on the 452 bidding processes and the qualifying requirements demanded are compared with the sector.
Perception of Engineering Students on Remote Teaching with the Flipped-Classroom Strategy
Said Pertuz
This text reports the results of a perception study of the students of remote teaching of the flipped-classroom method in comparison to two strategies of regular face-to-face teaching: classic elñcturing and learning based on projects. The perceptions study follows a cohort design where the students have the chance of experimenting the different pedagogic strategies in a sequence and perform an assessment at the course's end. The perception evaluation takes into account six criteria: comprehension, theoretical concepts appropriation, disciplinary formation, integral formation, dedication and academic burden, interaction among the subjects of the process and active learning. In a pilot study with 36 students of an engineering undergraduate program, remote teaching through flipped classrooms is always better or equally valued than those face-to-face strategies in all the considered criteria.
Magnetic Field Effects on Charge and Current Density in Finite Monolayer Graphene
Carlos Jose Paez Gonzalez, Jorge Hernan Quintero Orozco, Andrés Camilo García Castro
In this work, we study the effects of an external magnetic field on the charge and current density in finite monolayer graphene, i.e., with zig-zag and armchair edges. We use the tight-binding model to include the effects of the magnetic field and the effect of the edges. By using the transmission probability and analyzing the local density of states (charge density) ob- tained from Green's function method, we find an energy region where the wave functions are more localized in the edges and, consequently, the current flow across the borders. On the other hand, for energies close to Landau levels, the charge and current density are localized on the bulk of the system.
Biological and Physiochemical Conditions of the Surface Waters of the Cauca River in the Urban Area of Popayán, Colombia
Rafael Mauricio Padilla Moreno, Carlos Alberto Ospina Parra
The homes and companies located on the banks of the Cauca River have altered the conditions of the quality of the water generated by residual discharges. Therefore, this paper proposes to analyze the biological and physicochemical conditions of the surface waters that cross the urban area of Popayán, Colombia, and determine if they are suitable for human consumption. For this, an in-situ sampling was carried out in the two river stations. The two points were covered taking into account the dry and rainy seasons. At each point, the parameters were measured to calculate the contamination indicators. Likewise, Ph, diluted oxygen, conductivity and temperature parameters were measured, also other physicochemical parameters such as total alkalinity, total hardness, total phosphorus and suspended total solids were measured as well as the microbiological parameters like total coliforms. It was found that the water source contains high levels of pollutant load and that biological discharge is one of the main causes that alters the quality of the water for drinking. The number of macroinvertebrates in the river decreases by 48% as the river advances through the urban area of the city. According to the BMWP values, highly contaminated carbonated waters enter the urban area. However, due to the flow throughout the water source, the Cauca River can regulate the pollution load according to the result evidenced in the Icomi, Icomo, and Icosus indices.
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