The transcendence of the COVID-19 pandemic in education has transformed the way students use information and communication technologies (ICT) to take virtual classes since the closure of universities, so this research aims to describe how students in the School of Administrative Sciences at the Autonomous University of Baja California use ICT in times of COVID-19 to take their classes. The results obtained show that ICT management directly and indirectly influences students’ collaborative work, and in a direct way, the responsible use of ICT in the teaching–learning process. It also includes a construct validation of the ICT factor in the teaching–learning process and COVID-19 by means of confirmatory factor analysis (CFA), an analysis procedure in structural equation modeling (SEM).

The Linux operating system has been employed to execute numerous real-time applications. However, it is limited to support soft real-time systems by two scheduling policies: First-In-First-Out and Round Robin. For real-time systems with critical constraints, the soft real-time support and these scheduling policies are still insufficient. In this work, the Earliest Deadline First scheduling policy, which has been shown in theory to be an optimal one in uniprocessor systems, is introduced as an extension of the Linux kernel. This policy is implemented into the real-time class, without the necessity of defining an additional class. The Linux kernel affords capabilities of a hard real-time operating system by an RT-Preempt patch, enabling the use of Linux to implement hard realtime systems. The integration is compliant with the POSIX real-time and thread standards, ensuring applications portability, employing the GLIBC library. In order to validate the proposed implementation, a set of experiments is conducted, showing that a real-time system that cannot be feasibly scheduled using existing policies, attains feasibility when it is scheduled using the integrated Earliest Deadline First policy.

TIME RESTRICTION ASPECTS IN THE MODELING OF CYBER-PHYSICAL SYSTEMS FOR INDUSTRY 4.0

Se presenta una solución en el monitoreo de las condiciones del pH del agua para reducir la mano de obra y la mortalidad en los cultivos de camaroneros en el puerto de San Felipe B.C. Se utilizó una red de sensores inalámbricos basada en ZigBee para monitorear las condiciones críticas y todos los procesos de control donde realizaron con la ayuda de una serie de microcontroladores PIC16F886 incluyendo código en C en tiempo real. Este sistema es capaz de recopilar y presentar datos en una interfaz gráfica de usuario (GUI) local. También permite al usuario obtener información actualizada del sensor de pH vía web y en una aplicación móvil basada en Android, a través de la conectividad a Internet o en cualquier momento mediante alertas que recibe el usuario al correo electrónico. De este modo, el sistema minimiza los efectos negativos que causa el cambio repentino del valor del pH del agua en los camarones, reduce la mano de obra de las granjas. Debido a eso, el sistema propuesto ahorra el costo de contratar mano de obra y el uso de electricidad. El diseño es de bajo costo que funcionara mejor para las operaciones en la acuicultura de tamaño pequeño a mediano, ya que no requiere ninguna modificación en lo absoluto del estanque.