The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The water tank system is widely used for demonstration purposes in control engineering. This paper describes a training system for process automation, an ideal way to teach and learn about important aspects of automation. We present the implementation of a micro plant incorporating intelligent instruments. We also describe a set of teaching tools to facilitate the learning of concepts related to linear...
Cyber-Physical Systems (CPSs) may fail during runtime on supporting decision making if they are not capable of detecting and correcting their own failures. Thus, it has been proposed that CPSs should be self-aware, context-aware and goal-aware. In this paper we present preliminary results about how an architecture built over the Extensible Messaging and Presence Protocol (XMPP) may implement a distributed...
This paper presents the use of a new concept: Internet of Things (IoT), applied to the fermentation process of Cocoa at the Piura's mountain range. A prototype was designed and built with sensors that record the variables of temperature, oxygen and carbon dioxide during the process and send this information to the Internet. Finally a system has been developed that receives this information, visualizes...
The analytical evaluation of the Pocklington's integro-differential equation for thin wires has been solved by the Method of Moments in many different versions. However, the least square procedure proposed here is a variant that uses only real algebra and is slightly more complex and computer intensive as opposed to using the Method of the Moments. Good convergence for the current is obtained and...
This paper tackles the problem of finding the list of solutions with strictly increasing cost for the Semi-Assignment Problem. Four different algorithms are described and compared. The first two algorithms are based on a mathematical model and on a modification of Murty's algorithm, which was designed to find the list of solutions for the classical assignment problem. The third approach is a heuristic...
This paper studies the dynamic performance of BLDC motor with MatLab/Simulink, and the results of torques and speeds are verified with Mathematica software. MatLab/Simulink provides suitable environment for control application and power electronic design, whereas Mathematica is better for symbolic part and therefore it could be preferred for design and control applications for electrical motors. By...
Knowing the wind speed is an important factor that includes several scientific areas. For the types of existing anemometers, the ultrasonic model is what can be used in most applications. As part of the necessary calculus for wind speed acquisition, it is needed to find the correct ultrasonic echo emitted that has been corrupted by the environmental conditions imposed on it, and is the bigger challenge...
At present time Universidad de Las Américas (UDLA) is processing a huge amount of information between their campuses. An alternative network technology can provide communications to main offices and data center. Wireless networks have limits for area coverage and bit rates including spectrum licensing. FSO technology (Free Space Optics) allows configuring a dedicated link with high bit rates and no...
We present a virtual system for strengthening of lower limbs focused on children with cerebral palsy, in the implementation we use sensors that allow to obtain the angular velocity and rotation of direction of the bicycle, for the design of the virtual environment we use the Labview software, in which two scenarios of different difficulty are created to visualize in virtual form the trajectory that...
The implementation of devices developed in microstrip technology is commonly found in radio frequency and microwave communications, where it has evolved with a variety of applications, among which fast response filters stand out. In this study, we present the design and behavior of a microstrip Hairpin bandpass filter for a frequency of 2.45 GHz, with a bandwidth greater than 100 MHz, and an insertion...
This article describes a monitoring system that uses wearable devices for vital signs monitoring through clothes and transferring them wirelessly to an Android mobile interface. Allowing emissions of emergency signals when vital signs exceed the nominal values. The reliability of the implemented clothing has been determined with collected data on experimental tests and compared with values from medical...
We present a mobile application for the vowels learning of in children with SD, the methodology of the application design and the description of utilization are explained. The application was used by 4 children for one month (5 sessions per week), the results show that the application is an aid to primary teachers in teaching vowels in children with DS.
The acoustic wave propagation in solid structures has a specific impulse response pattern, that allows to identify the impact location over a structure. By using piezoelectric transducers, the vibration on the surface is translated into a voltage signal which is later analyzed to determine the position of the impact. This technique has the potential to transform any solid object into an interactive...
An introduction to the study of the behavior of the acoustic wave propagation in a homogeneous dispersive medium is presented in this work. We consider the stationary problem for a two-fluid channel waveguide. The classical normal mode theory as a solution of the scalar wave equation for an idealized stratified fluid layer lying on a semi-half space is described. Graphical solution of the stationary...
Electrical sub-transmission systems must ensure the reliability of the electrical system in the event of sudden changes in voltage and current, especially when there are atmospheric discharges. This document shows the influence of high resistivity on grounding, connected to guard wires in the San Rafael — Mulaló 69 KV Subtansmision line of ELEPCO S.A. By means of a field study, there are resistivities...
In this paper we analize the behaviour of model predictive control (MPC) on induction machine as an application for electric traction. We did a simulation on MATLAB/SIMULINK of a squirrel cage induction machine fed by a two level voltage inverter controlled by the MPC scheme with an electric vehicle as a load. We present the equations from the induction machine required by the control scheme, the...
Wireless technologies have attracted the attention of the industrial sector, due to their multiple advantages such as ease of installation, flexibility and mobility. However, the application of wireless in industry is most limited to non-critical sensing applications, making the communication of critical instruments and control systems almost exclusively with wired media. Despite this, wireless technologies...
This paper presents the design of coupled-line directional couplers using microstrip technology. It is verified that by attaching sections to a coupled-line directional coupler, the working bandwidth of the device can be increased, this increase is also achieved by varying the length (L), width (W) and separation (Se) of microstrip lines within the coupler sections. For such purpose, couplers of 1,...
Nonintrusive monitoring is a powerful tool to increase the quality, reliability, and efficiency of power electronics systems. In recent years, the use of intelligent systems to perform this type of tasks has been increased due to its high capacity to correctly predict the values of the parameters under monitoring. Support Vector Machines (SVM) is a supervised learning method that maps input data into...
Various models have been proposed to analyze the impact of synthetic inertia on frequency response. On one hand, the models that are detailed and realistic in terms power system impact normally overlook detailed representation of inertia emulation, which prevents the analysis of the impact of different control/optimization synthetic inertia policies on power systems. On the other hand, systematic...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.