Revista Visión Electrónica: algo más que un estado sólido

10-16

Authors: Laura Carolina Rozo Hoyos, Juan Pablo Pulgarín González, Paula Andrea Morales Fandiño, Jonathan Gallego Londoño

The episodes of Freezing of Gait (FOG) are a recurring symptom in people suffering from advanced stages of Parkinson's disease (PD). These are severe occurrences because they may cause falls to the patients, generating further traumas and concussions. In order to solve this yet ineffectively treated issue, this article describes the research that developed a device capable of predicting freezing episodes. On this project a wearable device was developed, which was able to predict freezing episodes based on the calculation of a freezing index (FI) determined by the signals obtained from an inertial measurement unit (IMU). This device was tested in three Patients and signals corresponding to normal gait and simulated Parkinson gait were taken. The results showed that FI obtained from Parkinson gait were much higher than those from a normal gait, validating this parameter as a key aspect in FOG prediction.

24-32

Authors: Adriana Marcela Molano Gómez, Andrés Felipe Neira Reyes, Luis Hernando Correa Salazar, Efraín Bernal Alzate

The importance of implementing solar generation systems in rural areas in Colombia lies not only in providing access to the electric power population, but also in the use of current technologies to enhance their socioeconomic growth. The difficulties for its realization lie in technical limitations and access to the site, preventing mayors, heads of council and communities in general can correctly estimate the topology that suits their needs, falling into deceptions by companies that offer them oversized systems or those that do not meet your technical needs. In this document an analysis is made of the different possible topologies for rural areas, offering a methodology for its implementation with two cases of use as real examples.

39-49

Authors: Fernando Campos Archila; Valentina Pinzón Saavedra; Faiber Robayo Betancourt

This paper aims to describe the design and implementation of the height control system for the quadrotor AR. Drone 2.0 making use of a fuzzy logic in a previously established environment. This device has a height control system both in simulation and in the real platform. Three controllers are developed by fuzzy logic whose parameters are obtained from the drone’s sensors in such a way that it allows to control height and angles of orientation (Pitch, Roll and Yaw) as long as certain levels of battery charge are considered so that the system does not become unstable. For the visualization and interaction with the drone a Matlab® interface is designed and implemented, that allows communication between the user and all system functions in such a way that the mode of execution can be chosen, follow the reference parameters autonomously, store data for a later analysis, and visualize the displacements to observe the efficiency of system.

57-74

Authors: Jhon Francined Herrera-Cubides; Paulo Alonso Gaona-García; Carlos Enrique Montenegro-Marín; Salvador Sánchez-Alonso; David Martin-Moncunill

Linked Data, as a strategy of the Semantic Web, is based on application of some basic principles that contribute to the growth of the Web, thus allowing the transit of the Web of Documents to the Web of Data. Developed process by Linked Data is supported in different scenarios, which interact in order to carry out the linking of resources on the Web. Some of these scenarios present a solid technological background, while others propose challenges when they are implemented. This paper aims to identify and expose a generic abstraction of Linked Data, in order to identify problem situations that restrict Linked Data process.

84-91

Authors: Ricardo Alonso Espinosa Medina; Hermes Darío Fuentes Muñoz

This study presents a modelling for the carotid artery that allows to analyze the theoretical behavior of pressure, flow and arterial volume in it, from the variation of both physical and physiological characteristics, such as: the thickness and length of the vessel blood, the viscosity and density of blood; determinants in the study of the normal functionality of the artery. The model of the arterial vessel –an adaptation of the Windkessel model of three elements, reported by Westerhof and Stergiopulos–, consists of an electrical circuit composed of passive RLC elements. The arterial segment was analyzed by mathematical and computational tools, relating Poiseuille’s laws and electric laws. The pressure, flow and volume curves were obtained when changes occurred in the measurable characteristics of the carotid artery, in order to facilitate the medical interpretation of possible pathologies related to these changes.

101-111

Authors: Oscar Gabriel Espejo Mojica

This article shows the process of designing a system of workbenches for laboratory practices oriented to virtual environments by using remote instrumentation techniques. The process was linked to a Research process in an Instrumentation Research Seeder in the Corporación Universitaria Minuto de Dios, Colombian University. The document also presents the design process from the concept generation and Embodiment Design to the construction of a Basic Electronics Functional Prototype, including a remote access, and a trainer. One of the most important conclusion of the project points to the fact that the Remote Laboratories system is a very powerful didactic tool, not only in Virtual Education Processes, but also it will be used in a lot of academic environments.

123-134

Authors: Sergio Alejandro Vaca; Esteban Serrano Vivas; Jorge Eliécer Rangel Díaz

The measurement of environmental variables turns out to be a wide field in which different techniques are used to capture the desired analog signals, all of the above in order to transform them and deliver them in such a way that their interpretation is clear. This article describes a research project, which was carried out for the Institute of Hydrology, Meteorology and Environmental Studies IDEAM –Colombia–, where a reverse engineering methodology was implemented aimed at the application of proprietary technologies to generate a new device capable of measuring soil temperature and moisture, starting from the design of the electronic circuit and arriving at the simulation. All based on existing equipment for the identification of electronic components, performance curves, and input and output signals, this with the aim of conceptualizing and generating bases for the final design.

144-151

Authors: Henry Alberto Hernández Martínez; Lely Adriana Luengas Contreras

An optimization process is a kind of process that systematically comes up with solutions that are better than a previous solution used before. Optimization algorithms are used to find solutions which are optimal or near-optimal with respect to some goals, to evaluate design tradeoffs, to assess control systems, to find patterns in data, and to find the optimum values (local or global) of mathematical functions. A genetic algorithm is one of the optimization techniques. In this way, a heuristic search that is inspired by Charles Darwin’s theory of natural evolution. This algorithm reflects the process of natural selection where the fittest individuals are selected for reproduction in order to produce offspring of the next generation which are population algorithms that emulate behavior similar to Darwinian natural selection. Taking into account these issues, this article shows the performance of a genetic algorithm designed, which allows to find several minimums within a function from the control of population diversity. To perform the tests, the algorithm with four different functions was used, with the particularity of having several minima with the same value. Proposed strategy was compared with a conventional genetic algorithm, the result was the conventional one can only find some of the minimums of the function and sometimes only one, while the proposal finds most of the minimums.

162-177

Authors: Yamir Alexander Arévalo Ortega; Sonia Rocio Corredor Vargas; Gustavo Adolfo Higuera Castro

Currently, the use of mobile terminals is becoming a necessity for a high number of people around the world which has driven the development of devices with Android operating system; In addition to this, the same indiscriminate access to resources of internet and weak local and international regulations on the use, they have become vulnerable to attacks on the network –injection of malware, ransomware–, among many others. Therefore, this article reviews the hacking tools for the forensic investigation of mobile terminals, proposing from the documentary research a forensic information acquisition model to determine tangible and significant evidences as a probative material.

195-210

Authors: Brian Villa Garzón; Jennifer Paola González Bustos; Manuel Alfonso Mayorga Morato

Currently, the production processes in Colombia are in a phase of continuous improvement, bringing together different specialties that seek to shape and potentiate a product or service, however it is necessary to considerably expand the panorama of possibilities to access the various branches of Creative Culture . From this perspective, entrepreneurship can generate added value that over time can become an opportunity for the sustainable development of the country. This article reviews the relationship between the Creative Economy and Production Engineering, explaining the potential of ideas from unconventional concepts and including them in business models that have managed to be pioneers in this new perspective, all of this through sustainable ideas, cultural heritage , administrative and pedagogical tools aswell as emerging technologies.