Revista Visión Electrónica: algo más que un estado sólido

247-253

Authors: Juan Camilo Conto-Campis, Jessica Marlen Ortiz-Guzmán, Ivonne Angélica Castiblanco-Jiménez, Johan Enrique Ortiz-Guzmán

It is given that in Bogota public transport system moves approximately 29.18% of the population, it is essential to ensure that the features of the service provision are the most appropriate for its users; for example, the support bars inside the vehicle are not at an adequate height according to the physical characteristics of the users, generating risks within the vehicles. Due to this failure has not been resolved in its entirety by the service provider is important to implement a method that allows adequate grip to the fasteners, considering this, the project aims to develop a system of grip and support that reduces the risks of physical damage to the user during his trip. This system will allow users who are in the orthostatic position (standing) to anchor themselves in a simple way of the elements incorporated in the vehicle. The development process was carried out using a combination of the Ulrich and Schnarch methodologies.

262-273

Authors: Ernesto Jair Eguis-Eslava, Kelly Marcela Padilla-García, Luis Alberto López-Díaz, José Daniel Soto-Ortiz, Rafael Castillo-Sierra, Mauricio Pardo-González, Cesar Augusto Orozco-Henao, Elvin Arnaldo Jiménez-Matos, Ingrid Oliveros-Pantoja

This article presents analysis of the operation results of a modied IEEE-13 distribution feeder, which was built to scale in the laboratory at the Universidad del Norte. In this article, we show the operating regime cases of the modied IEEE-13, under dierent levels of wind energy penetration. A modied IEEE-13 distribution feeder was built, considering the functionality of each scaled module and its generator-load under the Universidad del Norte laboratory conditions. An experimental methodology was used to compare the results obtained in the actual scaled model with the results of specialised programme simulations. The conclusions describe the amount of wind energy that can be injected into an electrical system that includes conventional power generation, while maintaining operation in compliance with the current regulatory framework.

280-288

Authors: Vanessa Cruz-Carbonell, Ricardo Andrés Castillo-Estepa

This paper describes a quadrupedal architecture assembly process using the modular robotic system Mecabot. Several possible topologies are considered, justifying the nal design that allows using an active column. Based on this, a mathematical model of control is proposed to perform movements of displacement, open turn and rotation. The locomotion proles for the rst two movement modalities are bioinspired. For the rotation modality, a characteristic quadrupedal robot transition is used to allow the correct rotation without using a large number of degrees of freedom. The proposed control model was deployed in a robot tested on structured and unstructured terrains by measuring its speed as a function of the movement frequency variation. For the open turn modality, the turn radius was measured as a function of the oset variation. Based on the test results, the second Mecabot conguration with legs was nally obtained, complementing our research work on apodal (snake, wheel caterpillar) and hexapod congurations.

294-299

Authors: Juan Carlos Martínez-Quintero, Edith Paola Estupiñan-Cuesta, Victor Daniel Rodríguez-Ortega

Radio frequency signal generators (RF) are instruments used to test reception equipment and RF components like lters, ampliers, attenuators, among others. On the other hand, they reinforce the teaching-learning processes and they are widely used in research in the telecommunications eld. This document provides the rst stage of a low-cost signal generator design by using RaspBerry Pi 3, with the documentary exploration about this kind of applications. After that, a recognition of the RaspBerry Pi 3 is done at hardware and software level. Finally, an application of an FM signal generator with RaspBerry in a frequency of 101.3 MHz is evaluated, which does not require any additional hardware. This signal was captured using a spectrum analyzer, which determined good quality of the modulated signal in terms of power, bandwidth and SNR (Signal Noise Ratio). However, there are some unwanted harmonic components.

305-311

Authors: Andrés Felipe Forero-García, Nicholas David Carreño-Pardo, Ruben Dario Hernández-Beleño, Robinson Jiménez-Moreno

This paper shows a mobile robot whose purpose is to provide comfort and meet various needs that may arise in family homes. This mobile has dierent sensors that allow monitoring the house remotely, since it has a direct connection between the user and the robot through a graphical interface connected to a wireless network, which shows all the readings of the sensors among other things. The sensory system sends orders to the dierent actuators that perform the order programmed by the user.

323-330

Authors: Orlando García-Hurtado, Mauro Misael García-Pupo, Roberto Poveda-Chaves

A methodological strategy is proposed for the teaching of Linear Algebra in engineering programs focused on plausible reasoning. These concepts were developed by [1] and [2], through the formulation and adaptation of interesting problems, whose design admitted a didactic model and a methodological procedure for the generation of conjectures through the mediation of technology and geometric visualization as key factors in the construction of the main concepts of the discipline by the students. The diculties in the teaching and learning of Linear Algebra have been studied since last century, in particular since the nineties. The LACSG (Linear Algebra Curriculum Study Group) in the USA is a reference point. On the other hand, Anna Sierpinska and Jean-Luc Dorier lead another group in Canada and Europe. Both groups coincide that one of the greatest problems in the teaching and learning of Linear Algebra is the formal approach of the classes that are traditionally taught. The starting point of this study is the great diculties students experience when assimilating denitions, theorems and demonstrations, which are elusive for the future engineers.

337-349

Authors: Oscar Hernán Cerquera-Losada, Luisa Fernanda Campos-Fajardo, Laura Sofía Cuéllar-Torrecillas, Luisa Alejandra Durán-Vargas, María Camila López-Tovar, Elizabeth Perea-Rodríguez, Erika Andrea Valero-Nieto, Delcy Angélica Villate-Montañez

The present inquiry arises as a result of a constant search of problems that aect cities of the country, by the Hotbed of Investigation of Surcolombian Socioeconomic Studies HISSS, of the Surcolombiana University of Neiva (Colombia) -.In this way, we found those factors and actions that contribute to making Bogota, Medellin, Barranquilla, Neiva, Tunja and Cucuta, cities that the Ministry of Environment and Sustainable Development through the urban environmental quality indexes (UEQUI) categorizes, at medium, low and very low levels. A methodology was developed that projects positivist and qualitative investigation, corresponding to a descriptive and explanatory study of the environmental sustainability of the cities is obtained from factors such as: public space; green areas; environmental pollution; mobility, public transport. The results obtained are of a relevant nature because they show old direct eects on the quality of life of the inhabitants, so that from them, alternative solutions are interpreted and proposed.

358-373

Authors: Carlos Yezid Rozo-Álvarez, Lindsay Álvarez-Pomar, Ernesto Gómez-Vargas, Imelda Lizcano-Caro

This study shows the results of the analysis of the liqueed petroleum gas (LPG) sector, by covering aspects related to its production and consumption. Initially addressing the international scenario with countries such as Spain, Brazil, China, India and Ghana later, it makes the analysis of the national scenario with a look at the participation of the sector within the energy matrix. Likewise, a comparison with a matrix Colombian national level to investigate the participation of the sector within the energy matrix and compare international and national scenarios. Despite its favourable environmental characteristics such as lower emissions of carbon monoxides, hydrocarbons and nitrogen oxides, as well as fewer greenhouse gases. LPG has a low contribution to the national energy sector considering that energy demand is concentrated in 69% of liquid fuels, the LPG sector can barely reFLect a growth of 0.4% and it is not competitive. Intervention of public policy is thus required to increase its competitiveness within the basket of liquid fuels, in such a way that it becomes a viable energetic alternative and its sectorial structure established from a public policy, allowing to supply a market and to satisfy the social and economic necessities.