Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Learning and Knowledge Technologies (TAC) are an essential component for education, facilitates the teaching process and allows the dynamic, interactive and innovative acquisition of knowledge. In this sense, this article aims to analyze the degree of acceptance of the technological implementation of TAC tools in the whole number theme, based on the Technological Acceptance Model (TAM). The methodology had a quantitative, exploratory, descriptive and correlational approach; 30 students of the eighth year of Basic General Education (EGB) participated, parallel "A", of the Educational Unit "La Salle". The instruments used were the survey, diagnostic pretest and posttest; Their results show that 32.1% of teachers use Microsoft Office programs for the development of classes, compared to 2.6% who use interactive presentations, there is some lack of knowledge in the management or application and resistance to implement them; Regarding the perceived usefulness, they agree that the use of TACs would increase their academic performance, in the same way the perceived ease of use is free of mental and physical effort. It is concluded that the technological implementation facilitates the construction of knowledge about integers.

The present study consists of the design and implementation of an IVR system implemented in Elastix in the Department of Information and Communication Technologies for the students of the Technical University of Ambato. For the development of this project free software tools such as Elastix, MySQL, PHP are used; same that allow by programming a script generated in PHP to make queries and access a database to obtain the information desired by the students. The php-agi library was also used, which has several functions that are very useful when using PHP as a programming language on the Elastix server. The research project allows students through a call to access their personal information within the university, entering their ID number, as well as information related to the academic part.

The purpose of this academic article is to present a proposed theoretical framework for the construction and generation of a collaborative governance model for universities in Ecuador through the development of software that allows automating the co-governance process, balancing power asymmetries. among those who make up the group of relevant actors within the universities, thereby improving the quality (efficiency and effectiveness) in the planning process through the application of collective intelligence and optimizing institutional management to achieve substantial improvements in compliance with what is planned, taking into account continuous monitoring and evaluation.

O objetivo do artigo é analisar a correspondência histórico-objetiva entre o fordismo e o setor metalmecânico no Brasil entre 1920 e 2015. Entendendo o fordismo como um método de intensificação do trabalho adequado à base técnica da manufatura, realizou-se uma pesquisa com dados históricos acerca do processo de trabalho no setor, cuja principal conclusão apontou para a ausência de tal correspondência. As evidências sugerem um desenvolvimento desigual entre os processos de usinagem, que chegou mais rapidamente à sistema de máquinas, e de montagem, que permaneceu como um processo manufatureiro em que o tipo de produto e sua escala foram igualmente restritivos ao método fordista.

This article aims to analyze the “evolution” of macroeconomics, both in terms of theory and economic practices, based on the dynamics of distributive conflict. In this sense, it is argued that the major inflections of macroeconomics (from nineteenth century liberalism to post-war Keynesianism, and from there to neoliberalism from the 1970s onwards) took place in contexts of distributive imbalance in favor of one or the other social class. Finally, the article makes some conjectures about the future of macroeconomics in the context of the current global pandemic.

This article studies the history of hotel entrepreneurs in Chile between 1930 and 1950, highlighting their participation in the development of tourism. Background is presented on hotel growth, its links with tourism and the Asociación de Propietarios Hoteleros y Similares de Chile (APH) created in 1929 is analyzed. As a result, it is noted that the strategy of the APH was to link the development of tourism with the growth of the hotel industry, fighting against a series of measures that they considered to be detrimental to their sector, such as social legislation and taxes. These disputes led to the articulation of the hoteliers’ union and its pressure for State to support the construction of hotels.

At this research paper presents the design of a box classification system based on artificial vision, which allows detecting the color of each of the boxes that enter the station. The system is based on the implementation of a cylindrical robot, a Cartesian robot (each one with its respective PLC) and a conveyor belt. The operation begins with the detection of boxes by means of a capacitive sensor which activates the cylindrical robot to position the boxes on the conveyor belt that it will take the boxes to the palletizing area, that band is activated through a signal sent by the robot cylindrical to the PLC of the Cartesian robot by a Profinet connection. Artificial vision is incorporated in the palletizing area for the classification of boxes by colors, where the Labview and Tia Portal software for data processing are linked through an OPC connection. At the moment the color is detected, the Cartesian robot is activated, which put each box in their respective position and groups them into batches of 3. Once the two types of boxes have been palletized, the system restarts its operating again. On the other hand, and as a complement, a web environment is designed for the management of an alarm system for making easier the interaction between the user and the implemented system.

In the field of engineering, Virtual Reality (VR) has emerged as a training option for students to generate practical skills in automatic process control. The article presents a VR application of a closed tank, which allows the introduction of control strategies for the pressure variable, using a microcontroller and a computer. The VR interface was implemented in Unity with the three-dimensional design of the plant shown to the user on the computer monitor, the mathematical model that characterizes the dynamic behavior of the process and the PID control strategy was established in the Arduino Uno module. Communication between the Arduino and the PC was established via RS-232 protocol. The VR environment consists of a panel for the selection and serial connection with the Arduino, also with inputs that allows to evaluate the control strategy as the SetPoint (SP) and the manual valve (a2), which is the actuator to introduce disturbance to the model. With the SP entered to the control system with perturbations of 20, 60 and 90%, the PID control performed well with minimal steady state errors.  The dynamic behavior of the process is visualized in the VR environment with the movement of the control valve stem (a1), the process variable (PV) is displayed on the PIT 100-A transmitter and the trends of the variables (SP, PV and CV). The proposal can be replicated to other processes and different variables such as level, flow, etc.

This paper presents the evaluation of the influence of the altitude and the length of the insulator string on the risk of insulation failure of a 500 kV overhead transmission line. Switching and Lightning impulses were simulated and the overvoltages generated were calculated using the Monte Carlo Method to compute the probability of insulation failure of a high voltage transmission. A MATLAB routine was developed to compute the density distribution of overvoltages f(U) and the probability of discharge of an insulation F(U); two different study cases (switching impulses and lightning impulses) and five different scenarios for lightning impulses were analyzed considering the random nature of the atmospheric discharges. The results of the simulations show the values and graphics of the risk of insulation failure in each study cases.