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Mr. Alfredo Alvarez-Diazcomas
Autonomous University of Queretaro

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0 Lithium-ion Batteries
0 DC-DC converters
0 Power converter
0 Electric vehicle technologies
0 battery equalizers

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battery equalizers

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Journal article
Published: 09 July 2021 in IEEE Transactions on Industrial Electronics
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This paper proposes a tracking controller for servomechanisms with a continuous friction model. The parameters of this model are estimated through a proposed two-step off-line identification methodology that uses a Linear Extended State Observer (LESO) based on the integral of position measurements, termed as ILESO. In the first step, the viscous and Coulomb coefficients of this friction model are estimated by the ordinary Least Squares (LS) method. The second step employs these estimates to obtain the initial guess for the Nonlinear Least Squares (NLLS) method that identifies all the parameters of the nonlinearly parameterized friction model. Finally, a backstepping controller is designed for reference tracking, which uses the estimated off-line friction model and on-line estimations of the servo position, velocity, and system uncertainty. These on-line estimations are provided by a modified ILESO, termed as FILESO, that has a similar structure to that of the ILESO but incorporates the identified off-line friction model into its dynamics. The convergence and stability of the proposed observer and controller are established using contraction analysis. Experimental results show that the proposed approach exhibits satisfactory performance.

ACS Style

Suresh Thenozhi; Antonio Concha; Juvenal Rodriguez Resendiz. A Contraction Theory-based Tracking Control Design With Friction Identification and Compensation. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.

AMA Style

Suresh Thenozhi, Antonio Concha, Juvenal Rodriguez Resendiz. A Contraction Theory-based Tracking Control Design With Friction Identification and Compensation. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Suresh Thenozhi; Antonio Concha; Juvenal Rodriguez Resendiz. 2021. "A Contraction Theory-based Tracking Control Design With Friction Identification and Compensation." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.

Journal article
Published: 01 July 2021 in Sensors
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The present research develops the parametric estimation of a second-order transfer function in its standard form, employing metaheuristic algorithms. For the estimation, the step response with a known amplitude is used. The main contribution of this research is a general method for obtaining a second-order transfer function for any order stable systems via metaheuristic algorithms. Additionally, the Final Value Theorem is used as a restriction to improve the velocity search. The tests show three advantages in using the method proposed in this work concerning similar research and the exact estimation method. The first advantage is that using the Final Value Theorem accelerates the convergence of the metaheuristic algorithms, reducing the error by up to 10 times in the first iterations. The second advantage is that, unlike the analytical method, it is unnecessary to estimate the type of damping that the system has. Finally, the proposed method is adapted to systems of different orders, managing to calculate second-order transfer functions equivalent to higher and lower orders. Response signals to the step of systems of an electrical, mechanical and electromechanical nature were used. In addition, tests were carried out with simulated signals and real signals to observe the behavior of the proposed method. In all cases, transfer functions were obtained to estimate the behavior of the system in a precise way before changes in the input. In all tests, it was shown that the use of the Final Value Theorem presents advantages compared to the use of algorithms without restrictions. Finally, it was revealed that the Gray Wolf Algorithm has a better performance for parametric estimation compared to the Jaya algorithm with an error up to 50% lower.

ACS Style

Omar Rodríguez-Abreo; Juvenal Rodríguez-Reséndiz; Francisco Velásquez; Alondra Ortiz Verdin; Juan Garcia-Guendulain; Mariano Garduño-Aparicio. Estimation of Transfer Function Coefficients for Second-Order Systems via Metaheuristic Algorithms. Sensors 2021, 21, 4529 .

AMA Style

Omar Rodríguez-Abreo, Juvenal Rodríguez-Reséndiz, Francisco Velásquez, Alondra Ortiz Verdin, Juan Garcia-Guendulain, Mariano Garduño-Aparicio. Estimation of Transfer Function Coefficients for Second-Order Systems via Metaheuristic Algorithms. Sensors. 2021; 21 (13):4529.

Chicago/Turabian Style

Omar Rodríguez-Abreo; Juvenal Rodríguez-Reséndiz; Francisco Velásquez; Alondra Ortiz Verdin; Juan Garcia-Guendulain; Mariano Garduño-Aparicio. 2021. "Estimation of Transfer Function Coefficients for Second-Order Systems via Metaheuristic Algorithms." Sensors 21, no. 13: 4529.

Journal article
Published: 04 June 2021 in Sustainability
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Humanity has developed recycling activities over time due to their benefits, the shortage of raw materials, or the footprint with regard to the environment. The absence of a recycling culture in Mexico has not allowed its development and growth despite the benefits. In 2012, Mexico only recycled less than 10% of urban solid waste. Most recycling activities are focused on plastic, paper, and cardboard products due to their prices in local markets. This article presents a semi-automated prototype focused on recycling glass bottles using the thermal shock phenomenon. It aims to develop a sustainable glass recycling culture by creating a new branch for the integral glass recycling process and a proposal base on Integrated Sustainable Waste Management (ISWM) and the Quintuple Helix Model. It helps to reduce waste and resource recovery from recycling and upcycling glass bottles. The products obtained from upcycling fulfill new uses and acquire new value, while glass leftovers continue the integral recycling process for glass. Additionally, this paper demonstrates the relation between the ISWM and the Quintuple Helix Model and the opportunity to implement the twelfth Sustainable Development Goal (SDG).

ACS Style

Jovheiry García Guerrero; Juvenal Rodríguez Reséndiz; Hugo Rodríguez Reséndiz; José Álvarez-Alvarado; Omar Rodríguez Abreo. Sustainable Glass Recycling Culture-Based on Semi-Automatic Glass Bottle Cutter Prototype. Sustainability 2021, 13, 6405 .

AMA Style

Jovheiry García Guerrero, Juvenal Rodríguez Reséndiz, Hugo Rodríguez Reséndiz, José Álvarez-Alvarado, Omar Rodríguez Abreo. Sustainable Glass Recycling Culture-Based on Semi-Automatic Glass Bottle Cutter Prototype. Sustainability. 2021; 13 (11):6405.

Chicago/Turabian Style

Jovheiry García Guerrero; Juvenal Rodríguez Reséndiz; Hugo Rodríguez Reséndiz; José Álvarez-Alvarado; Omar Rodríguez Abreo. 2021. "Sustainable Glass Recycling Culture-Based on Semi-Automatic Glass Bottle Cutter Prototype." Sustainability 13, no. 11: 6405.

Review
Published: 25 May 2021 in IEEE Access
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Dementia diseases are increasing rapidly, according to the World Health Organization (WHO), becoming an alarming problem for the health sector. The electroencephalogram (EEG) is a non-invasive test that records brain electrical activity and has a wide field of applications in the medical area, one of which is the detection of neurodegenerative diseases. The aim of this work is to present the results of a thorough review of the use of EEG systems for the detection of dementia diseases. Around 82 papers published between 2009 and 2020 were reviewed and compared obtaining data such as sampling time, number of electrodes, the most popular processing, classification, and validation techniques, as well as an analysis of the reported results. The relationship of the selected parameters with the efficiency obtained is shown. Some more common combinations in the reviewed papers that demonstrated to have reliability levels greater than 90%, and details to be considered at each stage of the process. An overview of the most commonly used classification tools and processing techniques is also described.

ACS Style

Luz-Maria Sanchez-Reyes; Juvenal Rodriguez-Resendiz; Gloria Nelida Avecilla-Ramirez; Maria-Luisa Garcia-Gomar; Jose-Billerman Robles-Ocampo. Impact of EEG Parameters Detecting Dementia Diseases: A Systematic Review. IEEE Access 2021, 9, 78060 -78074.

AMA Style

Luz-Maria Sanchez-Reyes, Juvenal Rodriguez-Resendiz, Gloria Nelida Avecilla-Ramirez, Maria-Luisa Garcia-Gomar, Jose-Billerman Robles-Ocampo. Impact of EEG Parameters Detecting Dementia Diseases: A Systematic Review. IEEE Access. 2021; 9 ():78060-78074.

Chicago/Turabian Style

Luz-Maria Sanchez-Reyes; Juvenal Rodriguez-Resendiz; Gloria Nelida Avecilla-Ramirez; Maria-Luisa Garcia-Gomar; Jose-Billerman Robles-Ocampo. 2021. "Impact of EEG Parameters Detecting Dementia Diseases: A Systematic Review." IEEE Access 9, no. : 78060-78074.

Journal article
Published: 26 April 2021 in IEEE Access
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PID controllers are widely used and adaptable to various types of systems. However, for the response to be adequate under different conditions, the PID gains must be adjusted. The tuning is made according to the difference between the reference value and the real value (error). This work presents a self-adjusting PID controller based on a backpropagation artificial neural network. The network calculates the appropriate gains according to the desired output, that is, the dynamic response desired which is composed of the transient part and the stationary part of the step response of a system. The contribution of the work is that in addition to using the error for network training, the maximum desired values of overshoots, settling times, and stationary errors were used as input data for the network. An offline training database was created using genetic algorithms to obtain the dynamic response data associated with PID gains. The genetic algorithm allows getting data in different operating ranges and allows using only stable gains combinations. The database was used for training. Subsequently, the neural network estimates an appropriate gain combination, adapting to the error and the desired response. The method performance is evaluated by controlling the speed of a direct current motor. The results indicate an average error of 4% for the database between the requested and system response. On the other hand, the gains estimated by the network in the test dataset (1544 combinations) did not cause instability and complying with the expected dynamic response in 86% of the dataset.

ACS Style

Omar Rodriguez-Abreo; Juvenal Rodriguez-Resendiz; Carlos Fuentes-Silva; Rodrigo Hernandez-Alvarado; Maria del Consuelo Patricia Torres Falcon. Self-Tuning Neural Network PID With Dynamic Response Control. IEEE Access 2021, 9, 65206 -65215.

AMA Style

Omar Rodriguez-Abreo, Juvenal Rodriguez-Resendiz, Carlos Fuentes-Silva, Rodrigo Hernandez-Alvarado, Maria del Consuelo Patricia Torres Falcon. Self-Tuning Neural Network PID With Dynamic Response Control. IEEE Access. 2021; 9 ():65206-65215.

Chicago/Turabian Style

Omar Rodriguez-Abreo; Juvenal Rodriguez-Resendiz; Carlos Fuentes-Silva; Rodrigo Hernandez-Alvarado; Maria del Consuelo Patricia Torres Falcon. 2021. "Self-Tuning Neural Network PID With Dynamic Response Control." IEEE Access 9, no. : 65206-65215.

Journal article
Published: 31 March 2021 in Sustainability
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This descriptive study intends to identify the satisfaction perception among the teachers of the Universidad del Valle de México (UVM) concerning the use of the Microsoft Teams platform in the transition from traditional model (face-to-face) to 100% online education [Emergency Remote Teaching (ERT)]. The proposal aims to determine the perspectives of teachers regarding the use of the Microsoft Teams platform during the crisis caused by COVID-19. UVM has 6938 full-time teachers and part-time teachers who collaborated in educational programs during January-June 2020 in the 33 campuses of UVM. And an instrument was developed and applied using finite population sampling, UVM perspective of teachers, which was distributed via Google Forms. The feasibility of the data collection instrument was determined by the Cronbach’s Alpha coefficient, with a result of 0.926. The data collection period was aligned with the first isolation period: 23 March to 20 April. The results in the perception of teacher satisfaction in the different sections of the instrument established an agreement in the answers (very satisfied or satisfied) regarding values that were higher than 60% in terms of satisfaction using the equipment. The analysis of the data collected was performed to verify the proposed hypothesis with the R version 4.0 software. A G-test was performed with the Logverosimilitude coefficient to test whether the categorical variables were independent (qualitative variables that are not defined continuously). The Krammer coefficient of association was then calculated to measure the correlation.

ACS Style

Marco Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Leticia Rodriguez Segura; Miguel Cruz Pérez; José Altamirano Corro; Wilfrido Paredes-Garcia; Hugo Rodríguez-Reséndiz. Analysis of Emergency Remote Education in COVID-19 Crisis Focused on the Perception of the Teachers. Sustainability 2021, 13, 3820 .

AMA Style

Marco Zamora-Antuñano, Juvenal Rodríguez-Reséndiz, Leticia Rodriguez Segura, Miguel Cruz Pérez, José Altamirano Corro, Wilfrido Paredes-Garcia, Hugo Rodríguez-Reséndiz. Analysis of Emergency Remote Education in COVID-19 Crisis Focused on the Perception of the Teachers. Sustainability. 2021; 13 (7):3820.

Chicago/Turabian Style

Marco Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Leticia Rodriguez Segura; Miguel Cruz Pérez; José Altamirano Corro; Wilfrido Paredes-Garcia; Hugo Rodríguez-Reséndiz. 2021. "Analysis of Emergency Remote Education in COVID-19 Crisis Focused on the Perception of the Teachers." Sustainability 13, no. 7: 3820.

Journal article
Published: 23 February 2021 in IEEE Access
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The existence of failures in photovoltaic systems causes energy losses, security problems, and damage to its components. Therefore, it is necessary to develop monitoring systems to improve their productivity, reliability, efficiency, and safety. This work proposes a method for detecting and indicating short-circuit failure and partial shading present in grid-connected photovoltaic modules. The novelty of this proposal is the processing of voltage and current signals generated (ripple signals) by the electrical interaction between the photovoltaic string, the photovoltaic inverter, the condition of the modules, temperature, and irradiance. The magnitudes of specific frequency components are obtained from these electrical signals using DFT, and Cartesian coordinates are formed in a three-dimensional plane. Coordinates belonging to each of the string conditions are mostly located in different octants from this plane. This distribution allows an assessment of the modules state. Certain scattering is solved with a K-nearest neighbors algorithm. The effectiveness of the methodology was experimentally validated in two PVG with different characteristics. In each test case, the method was adaptable to the real conditions of the photovoltaic system. The results show effectiveness greater than 90% in the first evaluation levels, there is a slightly lower detection certainty in anomalous conditions with coordinates that are very close to each other. However, the system has 100% certainty detecting the presence of an abnormal condition. The method allows adaptation to different conditions, and takes advantage of the electrical signals derived from the actual performance of the used devices.

ACS Style

Marco-Antonio Zuniga-Reyes; Jose-Billerman Robles-Ocampo; Perla-Yazmin Sevilla-Camacho; Juvenal Rodriguez-Resendiz; Orlando Lastres-Danguillecourt; Jorge-Evaristo Conde-Diaz. Photovoltaic Failure Detection Based on String-Inverter Voltage and Current Signals. IEEE Access 2021, 9, 39939 -39954.

AMA Style

Marco-Antonio Zuniga-Reyes, Jose-Billerman Robles-Ocampo, Perla-Yazmin Sevilla-Camacho, Juvenal Rodriguez-Resendiz, Orlando Lastres-Danguillecourt, Jorge-Evaristo Conde-Diaz. Photovoltaic Failure Detection Based on String-Inverter Voltage and Current Signals. IEEE Access. 2021; 9 ():39939-39954.

Chicago/Turabian Style

Marco-Antonio Zuniga-Reyes; Jose-Billerman Robles-Ocampo; Perla-Yazmin Sevilla-Camacho; Juvenal Rodriguez-Resendiz; Orlando Lastres-Danguillecourt; Jorge-Evaristo Conde-Diaz. 2021. "Photovoltaic Failure Detection Based on String-Inverter Voltage and Current Signals." IEEE Access 9, no. : 39939-39954.

Journal article
Published: 02 February 2021 in IEEE Access
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This research measures and compares the cortical activity at baseline and during light stimulation (LS) in patients with strabismus and amblyopia (SA) and healthy controls (HCs), to understand the differences in its functionality and propose LS as a potential brain stimulator. This observational, longitudinal, prospective study enrolled 17 SA patients and 17 HCs from Querétaro, México. Electroencephalography (EEG) and digital brain mapping (DBM) were used to identify changes in frequency, voltage, and brain coherence. A total of 68 DBM was analyzed for this purpose. Our results indicate that at baseline, patients with strabismus and amblyopia present: i) lower frequency of alpha-wave activity ( $p=0.029$ ) with an abnormal distribution within hemispheres, ii) theta-wave with a predominance in the frontal lobes, which relates these visual conditions to neurodevelopmental disorders, iii) higher values of low voltage ( $p < 0.001$ ) and lower values of and high voltage ( $p=0.001$ ) iv) interhemispheric asynchronicity with a predominance in the left hemisphere. On the other hand, the administration of LS modulates the brain activity of SA patients by i) modifying high and low voltages ( $p < 0.001$ and 0.022 respectively), which define the anteroposterior gradient ii) eliminating theta-waves, iii) distributing alpha-wave activity towards the occipital lobes iv) bringing synchronicity between hemispheres. For the HC group, LS alters the distribution of alpha waves within hemispheres, and the state of interhemispheric synchronicity. There were no statistically significant changes in the frequency of the alpha-wave or the anteroposterior gradient. To summarize, LS provokes a state of malleability in the brain of SA patients, by increasing the cortical connectivity, enhancing neural activation and bringing to balance the interhemispheric communication, which converts it into a potential brain stimulator that should be considered as a complementary therapy in the treatment of these patients.

ACS Style

Danjela Ibrahimi; Jorge Domingo Mendiola-Santibanez; Enoe Cruz Martinez; Juvenal Rodríguez-Reséndiz; Irineo Torres Pacheco. Cortical Activity at Baseline and During Light Stimulation in Patients With Strabismus and Amblyopia. IEEE Access 2021, 9, 22430 -22446.

AMA Style

Danjela Ibrahimi, Jorge Domingo Mendiola-Santibanez, Enoe Cruz Martinez, Juvenal Rodríguez-Reséndiz, Irineo Torres Pacheco. Cortical Activity at Baseline and During Light Stimulation in Patients With Strabismus and Amblyopia. IEEE Access. 2021; 9 ():22430-22446.

Chicago/Turabian Style

Danjela Ibrahimi; Jorge Domingo Mendiola-Santibanez; Enoe Cruz Martinez; Juvenal Rodríguez-Reséndiz; Irineo Torres Pacheco. 2021. "Cortical Activity at Baseline and During Light Stimulation in Patients With Strabismus and Amblyopia." IEEE Access 9, no. : 22430-22446.

Journal article
Published: 26 January 2021 in Sensors
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This manuscript presents a fully detailed methodology in order to identify the hydrodynamic parameters of a mini autonomous underwater vehicle (mini-AUV) and evaluate its performance using different controllers. The methodology consists of close-to-reality simulation using a Computed Fluid Dynamics (CFD) module of the ANSYS™ Workbench software, the processing of the data, obtained by simulation, with a set of Savistky–Golay filters; and, the application of the Least Square Method in order to estimate the hydrodynamic parameters of the mini-AUV. Finally, these parameters are considered to design the three different controllers that are based on the robot manipulators theory. Numerical simulations are carried out to evaluate the performance of the controllers.

ACS Style

José Castillo-Zamora; Karla Camarillo-Gómez; Gerardo Pérez-Soto; Juvenal Rodríguez-Reséndiz; Luis Morales-Hernández. Mini-AUV Hydrodynamic Parameters Identification via CFD Simulations and Their Application on Control Performance Evaluation. Sensors 2021, 21, 820 .

AMA Style

José Castillo-Zamora, Karla Camarillo-Gómez, Gerardo Pérez-Soto, Juvenal Rodríguez-Reséndiz, Luis Morales-Hernández. Mini-AUV Hydrodynamic Parameters Identification via CFD Simulations and Their Application on Control Performance Evaluation. Sensors. 2021; 21 (3):820.

Chicago/Turabian Style

José Castillo-Zamora; Karla Camarillo-Gómez; Gerardo Pérez-Soto; Juvenal Rodríguez-Reséndiz; Luis Morales-Hernández. 2021. "Mini-AUV Hydrodynamic Parameters Identification via CFD Simulations and Their Application on Control Performance Evaluation." Sensors 21, no. 3: 820.

Journal article
Published: 18 December 2020 in Applied Sciences
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This research focused on developing a methodology that facilitates the learning of control engineering students, specifically developing skills to design a complete control loop using fuzzy logic. The plant for this control loop is a direct current motor, one of the most common actuators used by educational and professional engineers. The research was carried out on a platform developed by a group of students. Although the learning techniques for the design and implementation of controllers are extensive, there has been a delay in teaching techniques that are relatively new compared to conventional control techniques. Then, the hands-on laboratory offers a tool for students to acquire the necessary skills in driver tuning. In addition to the study of complete systems, the ability to work in a team is developed, a fundamental skill in the professional industrial area. A qualitative and quantitative analysis of student learning was carried out, integrating a multidisciplinary project based on modern tools.

ACS Style

Hugo Torres-Salinas; Juvenal Rodríguez-Reséndiz; Adyr A. Estévez-Bén; M. A. Cruz Pérez; P. Y. Sevilla-Camacho; Gerardo I. Perez-Soto. A Hands-On Laboratory for Intelligent Control Courses. Applied Sciences 2020, 10, 9070 .

AMA Style

Hugo Torres-Salinas, Juvenal Rodríguez-Reséndiz, Adyr A. Estévez-Bén, M. A. Cruz Pérez, P. Y. Sevilla-Camacho, Gerardo I. Perez-Soto. A Hands-On Laboratory for Intelligent Control Courses. Applied Sciences. 2020; 10 (24):9070.

Chicago/Turabian Style

Hugo Torres-Salinas; Juvenal Rodríguez-Reséndiz; Adyr A. Estévez-Bén; M. A. Cruz Pérez; P. Y. Sevilla-Camacho; Gerardo I. Perez-Soto. 2020. "A Hands-On Laboratory for Intelligent Control Courses." Applied Sciences 10, no. 24: 9070.

Review
Published: 30 October 2020 in Energies
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Electric vehicles (EVs) are an alternative to internal combustion engine (ICE) cars, as they can reduce the environmental impact of transportation. The bottleneck for EVs is the high-voltage battery pack, which utilizes most of the space and increases the weight of the vehicle. Currently, the main challenge for the electronics industry is the cell equalization of the battery pack. This paper gives an overview of the research works related to battery equalizer circuits (BECs) used in EV applications. Several simulations were carried out for the main BEC topologies with the same initial conditions. The results obtained were used to perform a quantitative analysis between these schemes. Moreover, this review highlights important issues, challenges, variables and parameters associated with the battery pack equalizers and provides recommendations for future investigations. We think that this work will lead to an increase in efforts on the development of an advanced BEC for EV applications.

ACS Style

Alfredo Alvarez-Diazcomas; Adyr A. Estévez-Bén; Juvenal Rodríguez-Reséndiz; Miguel-Angel Martínez-Prado; Roberto V. Carrillo-Serrano; Suresh Thenozhi. A Review of Battery Equalizer Circuits for Electric Vehicle Applications. Energies 2020, 13, 5688 .

AMA Style

Alfredo Alvarez-Diazcomas, Adyr A. Estévez-Bén, Juvenal Rodríguez-Reséndiz, Miguel-Angel Martínez-Prado, Roberto V. Carrillo-Serrano, Suresh Thenozhi. A Review of Battery Equalizer Circuits for Electric Vehicle Applications. Energies. 2020; 13 (21):5688.

Chicago/Turabian Style

Alfredo Alvarez-Diazcomas; Adyr A. Estévez-Bén; Juvenal Rodríguez-Reséndiz; Miguel-Angel Martínez-Prado; Roberto V. Carrillo-Serrano; Suresh Thenozhi. 2020. "A Review of Battery Equalizer Circuits for Electric Vehicle Applications." Energies 13, no. 21: 5688.

Journal article
Published: 29 October 2020 in Sensors
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Servo systems are feedback control systems characterized by position, speed, and/or acceleration outputs. Nowadays, industrial advances make the electronic stages in these systems obsolete compared to the mechanical elements, which generates a recurring problem in technological, commercial and industrial applications. This article presents a methodology for the development of an open-architecture controller that is based on reconfigurable hardware under the open source concept for servo applications. The most outstanding contribution of this paper is the implementation of a Genetic Algorithm for online self tuning with a focus on both high-quality servo control and reduction of vibrations during the positioning of a linear motion system. The proposed techniques have been validated on a real platform and form a novel, effective approach as compared to the conventional tuning methods that employ empirical or analytical solutions and cannot improve their parameter set. The controller was elaborated from the Graphical User Interface to the logical implementation while using free tools. This approach also allows for modification and updates to be made easily, thereby reducing the susceptibility to obsolescence. A comparison of the logical implementation with the manufacturer software was also conducted in order to test the performance of free tools in FPGAs. The Graphical User Interface developed in Python presents features, such as speed profiling, controller auto-tuning, measurement of main parameters, and monitoring of servo system vibrations.

ACS Style

Edson E. Cruz-Miguel; José R. García-Martínez; Juvenal Rodríguez-Reséndiz; Roberto V. Carrillo-Serrano. A New Methodology for a Retrofitted Self-tuned Controller with Open-Source FPGA. Sensors 2020, 20, 6155 .

AMA Style

Edson E. Cruz-Miguel, José R. García-Martínez, Juvenal Rodríguez-Reséndiz, Roberto V. Carrillo-Serrano. A New Methodology for a Retrofitted Self-tuned Controller with Open-Source FPGA. Sensors. 2020; 20 (21):6155.

Chicago/Turabian Style

Edson E. Cruz-Miguel; José R. García-Martínez; Juvenal Rodríguez-Reséndiz; Roberto V. Carrillo-Serrano. 2020. "A New Methodology for a Retrofitted Self-tuned Controller with Open-Source FPGA." Sensors 20, no. 21: 6155.

Journal article
Published: 17 September 2020 in Sensors
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Motion control is widely used in industrial applications since machinery, robots, conveyor bands use smooth movements in order to reach a desired position decreasing the steady error and energy consumption. In this paper, a new Proportional-Integral-Derivative (PID) -type fuzzy logic controller (FLC) tuning strategy that is based on direct fuzzy relations is proposed in order to compute the PID constants. The motion control algorithm is composed by PID-type FLC and S-curve velocity profile, which is developed in C/C++ programming language; therefore, a license is not required to reproduce the code among embedded systems. The self-tuning controller is carried out online, it depends on error and change in error to adapt according to the system variations. The experimental results were obtained in a linear platform integrated by a direct current (DC) motor connected to an encoder to measure the position. The shaft of the motor is connected to an endless screw; a cart is placed on the screw to control its position. The rise time, overshoot, and settling time values measured in the experimentation are 0.124 s, 8.985% and 0.248 s, respectively. These results presented in part 6 demonstrate the performance of the controller, since the rise time and settling time are improved according to the state of the art. Besides, these parameters are compared with different control architectures reported in the literature. This comparison is made after applying a step input signal to the DC motor.

ACS Style

José R. García-Martínez; Edson E. Cruz-Miguel; Roberto V. Carrillo-Serrano; Fortino Mendoza-Mondragón; Manuel Toledano-Ayala; Juvenal Rodríguez-Reséndiz. A PID-Type Fuzzy Logic Controller-Based Approach for Motion Control Applications. Sensors 2020, 20, 5323 .

AMA Style

José R. García-Martínez, Edson E. Cruz-Miguel, Roberto V. Carrillo-Serrano, Fortino Mendoza-Mondragón, Manuel Toledano-Ayala, Juvenal Rodríguez-Reséndiz. A PID-Type Fuzzy Logic Controller-Based Approach for Motion Control Applications. Sensors. 2020; 20 (18):5323.

Chicago/Turabian Style

José R. García-Martínez; Edson E. Cruz-Miguel; Roberto V. Carrillo-Serrano; Fortino Mendoza-Mondragón; Manuel Toledano-Ayala; Juvenal Rodríguez-Reséndiz. 2020. "A PID-Type Fuzzy Logic Controller-Based Approach for Motion Control Applications." Sensors 20, no. 18: 5323.

Journal article
Published: 11 September 2020 in Sustainability
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At the onset of the crisis caused by COVID-19, the Mexican education system chose to join the global context and suspend face-to-face classes for all educational levels. For the continuity of educational processes, a transition from a traditional educational model (face-to-face) to emergency remote teaching (ERT) was made through virtual learning platforms and learning management system (LMS) schemes. Universidad del Valle de Mexico (UVM), in a collaboration agreement with Microsoft Co., chose to use Teams to continue its educational process. In this work, we intend to identify the factors that can be taken into account regarding the level of student satisfaction in the teaching–learning process in ERT using Teams, and validate the established educational strategy. Statistical analysis was carried out to analyze the academic environment for these scenario changes while considering knowledge assessment, and competencies achievement. A combined sampling method was applied with convenience and statistical analysis. The main results established significant percentages, where more than 60% of the students surveyed were manifested in the use of the teams and the organization of the class sessions by the teachers, and the activities developed. Using the Cronbach’s Alpha coefficient, the reliability of the data collection instruments was determined. The correlations of each of the survey questions were calculated to determine the relationship between themselves and the total answers, giving results similar to those obtained through data science tools. Taking advantage of the situation, data science tools were applied to compare the results with obtained values from RapidMiner software in the correlation of factors in of 0.440, 0.384, 0.246, 0.048 and 0.384.

ACS Style

Leticia Rodriguez-Segura; Marco Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Wilfrido Paredes-García; Antonio Altamirano-Corro; Miguel Cruz-Pérez. Teaching Challenges in COVID-19 Scenery: Teams Platform-Based Student Satisfaction Approach. Sustainability 2020, 12, 7514 .

AMA Style

Leticia Rodriguez-Segura, Marco Zamora-Antuñano, Juvenal Rodríguez-Reséndiz, Wilfrido Paredes-García, Antonio Altamirano-Corro, Miguel Cruz-Pérez. Teaching Challenges in COVID-19 Scenery: Teams Platform-Based Student Satisfaction Approach. Sustainability. 2020; 12 (18):7514.

Chicago/Turabian Style

Leticia Rodriguez-Segura; Marco Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Wilfrido Paredes-García; Antonio Altamirano-Corro; Miguel Cruz-Pérez. 2020. "Teaching Challenges in COVID-19 Scenery: Teams Platform-Based Student Satisfaction Approach." Sustainability 12, no. 18: 7514.

Journal article
Published: 13 August 2020 in Electronics
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The objective of this work is to design and implement a scalable Field-Programmable Gate Array (FPGA)-based motion control system for DC servo motors using a parabolic velocity profile for industrial applications. The implementation in this device allows the obtaining of a fast, flexible and low-cost system. The system is divided into control, communication and closed-loop coupling. The work also addresses a comparative analysis of the most used profiles, the trapezoidal and parabolic. The comparison is made considering the energy consumption of both profiles. As a consequence of the comparison made, the velocity profile can be selected to reduce production costs by saving energy and reducing wear on machinery. The discrete models of the velocity profiles are obtained through numerical methods that permit the control blocks to be implemented in an FPGA. To reduce maintenance costs and energy consumption in servo mechanisms, the derivation of the acceleration or jerk of the motor is shown. A Graphic User Interface (GUI) is presented, which allows monitoring the position, velocity and angular acceleration of the motor shaft. In addition, the developed interface supports modification of parameters of the final position and maximum velocity in the motor. The delivered current is compared, evaluating its decrease using a parabolic velocity profile. Finally, the experimental results are illustrated.

ACS Style

Victor Montalvo; Adyr A. Estévez-Bén; Juvenal Rodríguez-Reséndiz; Gonzalo Macias-Bobadilla; Jorge D. Mendiola-Santíbañez; Karla A. Camarillo-Gómez. FPGA-based Architecture for Sensing Power Consumption on Parabolic and Trapezoidal Motion Profiles. Electronics 2020, 9, 1301 .

AMA Style

Victor Montalvo, Adyr A. Estévez-Bén, Juvenal Rodríguez-Reséndiz, Gonzalo Macias-Bobadilla, Jorge D. Mendiola-Santíbañez, Karla A. Camarillo-Gómez. FPGA-based Architecture for Sensing Power Consumption on Parabolic and Trapezoidal Motion Profiles. Electronics. 2020; 9 (8):1301.

Chicago/Turabian Style

Victor Montalvo; Adyr A. Estévez-Bén; Juvenal Rodríguez-Reséndiz; Gonzalo Macias-Bobadilla; Jorge D. Mendiola-Santíbañez; Karla A. Camarillo-Gómez. 2020. "FPGA-based Architecture for Sensing Power Consumption on Parabolic and Trapezoidal Motion Profiles." Electronics 9, no. 8: 1301.

Journal article
Published: 01 August 2020 in International Journal of Hydrogen Energy
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Since 1996, the California Air Resources Board has established the OBD-II as a communication protocol that systems use to control gas emissions. Such a standard was created in 1988 and allows modern vehicles to obtain technical engine data such as fuel injection, speed, and air mass flow. In this article, an experimental test bench is presented using the Raspberry-Pi 3 programming board and a serial connection to the OBD-II port. Also, the standard ELM327 is employed as a connection adapter to analyze data sets and to calculate the ideal time for hydrogen injection. This process is achieved by an in-situ generator as a supplementary fuel source for internal combustion engines. It permits the reduction of greenhouse gas emissions and improves fuel efficiency, as it has already been reported in multiple previous types of research. The methodology describes the process of acquiring data through the OBD-II port, the type of hydrogen generator, and the calibration implemented according to expert system rules as well as the installation process of the system in the experimental vehicle. The developed algorithm is implemented using the programming language Python to determine the ideal time for activating the hydrogen generator. The results include simulation behavior of the fuzzy logic algorithm in Matlab of vehicle engine for its comparison with the validated results and offer a proposal to optimize hydrogen injection for future researches. Then, the efficiency of electrolyzer in ICE is improved by extending the lifetime of the entire device and the electrolyte.

ACS Style

G. Macias-Bobadilla; J.D. Becerra-Ruiz; Adyr A. Estévez-Bén; Juvenal Rodríguez-Reséndiz. Fuzzy control-based system feed-back by OBD-II data acquisition for complementary injection of hydrogen into internal combustion engines. International Journal of Hydrogen Energy 2020, 45, 26604 -26612.

AMA Style

G. Macias-Bobadilla, J.D. Becerra-Ruiz, Adyr A. Estévez-Bén, Juvenal Rodríguez-Reséndiz. Fuzzy control-based system feed-back by OBD-II data acquisition for complementary injection of hydrogen into internal combustion engines. International Journal of Hydrogen Energy. 2020; 45 (51):26604-26612.

Chicago/Turabian Style

G. Macias-Bobadilla; J.D. Becerra-Ruiz; Adyr A. Estévez-Bén; Juvenal Rodríguez-Reséndiz. 2020. "Fuzzy control-based system feed-back by OBD-II data acquisition for complementary injection of hydrogen into internal combustion engines." International Journal of Hydrogen Energy 45, no. 51: 26604-26612.

Journal article
Published: 13 July 2020 in Processes
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Although hydrogen is the most abundant element in the universe, it is not possible to find it in its purest state in nature. In this study, two-stage experimentation was carried out. The first stage was hydrogen production. The second stage was an electrochemical process to hydrogenate soybean oil in a PEM fuel cell. In the fist stage a Zirfon Perl UTP 500 membrane was used in an alkaline hydrolizer of separated gas to produce hydrogen, achieving 9.6 L/min compared with 5.1 L/min, the maximum obtained using a conventional membrane. The hydrogen obtained was used in the second stage to feed the fuel cell hydrogenating the soybean oil. Hydrogenated soybean oil showed a substantial diminished iodine index from 131 to 54.85, which represents a percentage of 58.13. This happens when applying a voltage of 90 mV for 240 min, constant temperature of 50 ∘ C and one atm. This result was obtained by depositing 1 mg of Pt/cm 2 in the cathode of the fuel cell. This system represents a viable alternative for the use of hydrogen in energy generation.

ACS Style

Jorge Eduardo Esquerre Verastegui; Marco Antonio Zamora Antuñano; Juvenal Rodríguez Resendiz; Raul García García; Pedro Jacinto Paramo Kañetas; Daniel Larrañaga Ordaz. Electrochemical Hydrogen Production Using Separated-Gas Cells for Soybean Oil Hydrogenation. Processes 2020, 8, 832 .

AMA Style

Jorge Eduardo Esquerre Verastegui, Marco Antonio Zamora Antuñano, Juvenal Rodríguez Resendiz, Raul García García, Pedro Jacinto Paramo Kañetas, Daniel Larrañaga Ordaz. Electrochemical Hydrogen Production Using Separated-Gas Cells for Soybean Oil Hydrogenation. Processes. 2020; 8 (7):832.

Chicago/Turabian Style

Jorge Eduardo Esquerre Verastegui; Marco Antonio Zamora Antuñano; Juvenal Rodríguez Resendiz; Raul García García; Pedro Jacinto Paramo Kañetas; Daniel Larrañaga Ordaz. 2020. "Electrochemical Hydrogen Production Using Separated-Gas Cells for Soybean Oil Hydrogenation." Processes 8, no. 7: 832.

Journal article
Published: 08 July 2020 in IEEE Access
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This paper analyzes a cohort of children diagnosed with congenital strabismus independent of the deviation direction, dissociated and non-dissociated, to identify anisocoria magnitude under scotopic conditions. This disease presents changes in the white matter affecting the nerve conduction in the cortical integrator, exacerbating the reflexes controlling pupil size, producing subtle changes in the pupil dimensions that are difficult to measure using current methods. The proposed indexes estimate the degree of anisocoria using the Feret diameter and the Pattern Pupil parameter. This research presents a prospective, transversal, and experimental study carried out on 168-Mexican children aged 5-15 years from Querétaro, México, diagnosed with dissociated and non-dissociated congenital strabismus. The utilized images come from videos of each patient recorded in scotopic lighting conditions (0.3 lux). The ophthalmologist measured the Feret diameters of both pupils using the ImageJ software. 11.9% of the sample group showed “Very significant,” and “Significant” degrees of anisocoria, whereas 88.1% of the sample group had “Non-significant,” and “Few significant” degrees of anisocoria. When comparing the results with those obtained using the perimeter, and the diameter, subtle variations of anisocoria were better detected using the area criterion. ANOVA experiments allowed the following: 1) dissociated and non-dissociated congenital strabismus identification using nidp index, and 2) the comparison of the anisocoria degrees identified by the nidp and Ddmm ≥0.4 mm indexes.

ACS Style

Martin Gallegos-Duarte; Jorge Domingo Mendiola-Santibanez; Danjela Ibrahimi; Carlos Paredes-Orta; Juvenal Rodriguez-Resendiz; Carlos Alberto Gonzalez-Gutierrez. A Novel Method for Measuring Subtle Alterations in Pupil Size in Children With Congenital Strabismus. IEEE Access 2020, 8, 125331 -125344.

AMA Style

Martin Gallegos-Duarte, Jorge Domingo Mendiola-Santibanez, Danjela Ibrahimi, Carlos Paredes-Orta, Juvenal Rodriguez-Resendiz, Carlos Alberto Gonzalez-Gutierrez. A Novel Method for Measuring Subtle Alterations in Pupil Size in Children With Congenital Strabismus. IEEE Access. 2020; 8 ():125331-125344.

Chicago/Turabian Style

Martin Gallegos-Duarte; Jorge Domingo Mendiola-Santibanez; Danjela Ibrahimi; Carlos Paredes-Orta; Juvenal Rodriguez-Resendiz; Carlos Alberto Gonzalez-Gutierrez. 2020. "A Novel Method for Measuring Subtle Alterations in Pupil Size in Children With Congenital Strabismus." IEEE Access 8, no. : 125331-125344.

Review
Published: 24 June 2020 in Energies
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At present, renewable energies represent 25% of the global power generation capacity. The increase in clean energy facilities is mainly due to the high levels of pollution generated by the burning of fossil fuels to satisfy the growing electricity demand. The global capacity of generating electricity from solar energy has experienced a significant increase, reaching 505 GW in 2018. Today, multilevel inverters are used in PV systems to convert direct current into alternating current. However, the use of multilevel inverters in renewable energies applications presents different challenges; for example, grid-connected systems use a transformer to avoid the presence of leakage currents. The grid-connected systems must meet at least two international standards analyzed in this work: VDE 0126-1-1 and VDE-AR-N 4105, which establish a maximum leakage current of 300 mA and harmonic distortion maximum of 5%. Previously, DC/AC converters have been studied in different industrial applications. The state-of-the-art presented in the work is due to the growing need for a greater use of clean energy and the use of inverters as an interface between these technologies and the grid. Also, the paper presents a comparative analysis of the main multilevel inverter voltage-source topologies used in transformerless PV systems. In each scheme, the advantages and disadvantages are presented, as well as the main challenges. In addition, current trends in grid-connected systems using these schemes are discussed. Finally, a comparative table based on input voltage, switching frequency, output levels, control strategy used, efficiency, and leakage current is shown.

ACS Style

Adyr Andrés Estévez De Bén; Alfredo Alvarez-Diazcomas; Juvenal Rodriguez-Resendiz. Transformerless Multilevel Voltage-Source Inverter Topology Comparative Study for PV Systems. Energies 2020, 13, 3261 .

AMA Style

Adyr Andrés Estévez De Bén, Alfredo Alvarez-Diazcomas, Juvenal Rodriguez-Resendiz. Transformerless Multilevel Voltage-Source Inverter Topology Comparative Study for PV Systems. Energies. 2020; 13 (12):3261.

Chicago/Turabian Style

Adyr Andrés Estévez De Bén; Alfredo Alvarez-Diazcomas; Juvenal Rodriguez-Resendiz. 2020. "Transformerless Multilevel Voltage-Source Inverter Topology Comparative Study for PV Systems." Energies 13, no. 12: 3261.

Journal article
Published: 22 May 2020 in Sustainability
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At present, supporting e-learning with interactive virtual campuses is a future goal in education. Models that measure the levels of acceptance, performance, and academic efficiency have been recently developed. In light of the above, we carried out a study to evaluate a model for which architecture design, configuration, metadata, and statistical coefficients were obtained using four Learning Management Systems (LMSs). That allowed us to determine reliability, accuracy, and correlation, using and integrating the factors that other researchers have previously used, only using isolated models, such as Anxiety–Innovation (AI), Utility and Use (UU), Tools Learning (TL), System Factors (SF), Access Strategies (AS), Virtual Library (VL), and Mobile Use (MU). The research was conducted over one year in nine groups. The results from an LMS Classroom, architecturally and configuration-wise, had the highest level of performance, with an average of 73% when evaluated using statistical coefficients. The LMS Classroom had a good acceptance and a greater impact: SF, 82%, AI, 80%, and VL, 43%, while out of the seven factors, those with the most significant impact on academic efficiency were TL, 80%, VL, 82%, and MU, 85%.

ACS Style

Brenda Juárez Santiago; Juan Manuel Olivares Ramírez; Juvenal Rodríguez-Reséndiz; Andrés Dector; Raúl García García; José Eli Eduardo González-Durán; Fermín Ferriol Sánchez. Learning Management System-Based Evaluation to Determine Academic Efficiency Performance. Sustainability 2020, 12, 4256 .

AMA Style

Brenda Juárez Santiago, Juan Manuel Olivares Ramírez, Juvenal Rodríguez-Reséndiz, Andrés Dector, Raúl García García, José Eli Eduardo González-Durán, Fermín Ferriol Sánchez. Learning Management System-Based Evaluation to Determine Academic Efficiency Performance. Sustainability. 2020; 12 (10):4256.

Chicago/Turabian Style

Brenda Juárez Santiago; Juan Manuel Olivares Ramírez; Juvenal Rodríguez-Reséndiz; Andrés Dector; Raúl García García; José Eli Eduardo González-Durán; Fermín Ferriol Sánchez. 2020. "Learning Management System-Based Evaluation to Determine Academic Efficiency Performance." Sustainability 12, no. 10: 4256.