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16th IEEE Latin American Symposium on Circuits and Systems, LASCAS 2025

作者： Johnson, Emmanuel K. M. Lima, Luis Victor N. Campagnucci, Pamela. R. A. N. Haddad, Sandro A. P. Amaral, Wellington A. Munoz, Daniel M. University of Brasilia Mechatronics Graduate Program Department of Mechanical Engineering DF Brasilia Brazil University of Brasilia Faculty of Gama Electronics Engineering Undergraduate Program DF Brasilia Brazil

ISBN: (纸本)9798331522124

This paper presents a comparison between two LDOs (Low Dropout Regulators) developed for a PMIC (Power Management Integrated Circuit) responsible for powering a 32-bit microcontroller based on the RISC-V microarchitecture, designed in 22 nm technology. The microcontroller will be integrated with a radio frequency interface for IoT (Internet of Things) applications. Two LDOs were designed: one with external compensation and the other a capacitor-less LDO. Both operate with an input voltage of 2.5V, an output voltage of 0.8V, and a maximum current of 150mA. The externally compensated LDO exhibited greater stability in response to load variations and a higher PSRR (Power Supply Rejection Ratio), while the capacitor-less LDO demonstrated faster regulation speed and occupied a chip area similar to the externally compensated LDO. © 2025 IEEE.

关键词： Low power electronics

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Self-Attenuating Graphene-Based Antennas Utilizing Polyvinylidene Fluoride (PVDF) Substrates 2

Self-Attenuating Graphene-Based Antennas Utilizing Polyvinyl...

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2nd International Microwave and Antenna Symposium, IMAS 2024

作者： Frankhouse, Josef Addo-Mensah, Evans Wejinya, Uche University of Arkansas Department of Mechanical Engineering Fayetteville United States Graduate Program University of Arkansas Fayetteville United States

ISBN: (纸本)9798350356359

In this study, a Terahertz (THz) band antenna which can regulate its own resonant frequency without the requirement of manual adjustment is simulated. A polyvinylidene fluoride (PVDF) substrate is applied onto a rectangular graphene patch antenna. With a voltage potential applied onto the PVDF, the patch antenna can attenuate its frequency by physically changing the shape of the antenna, and in turn its resonant frequency. These antennas are within a 0.1 THz band between 1.32 THz to 1.22 THz measured from a radial bend of a flat surface to r = 75 μm, fitting into a return loss (S11) above -30 dB. Although the return loss did not show consistency, the resonating frequency shifted at a linear rate relative to the cylindrical bending. © 2024 IEEE.

关键词： Microstrip antennas

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Application of Linear Electromagnetic Actuators in Vehicular Suspensions 12

Application of Linear Electromagnetic Actuators in Vehicular...

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12th SAE BRASIL Colloquium on Suspensions and Road Implements and engineering Exhibition, BRASILCOLL 2023

作者： Eckert, Paulo Roberto Boff, Ben Hur Bandeira Follmann, Lucas Da Silva Oliveira, Eduardo Filho, Aly Ferreira Flores Flores, Jeferson Vieira Perondi, Eduardo Andre Lenz, Augusto Schmidt Poli, Mariana Damm Marcolin, Vinicius Campagnaro Struck, Rodrigo Graduate Program in Electrical Engineering Federal Universi Russia Graduate Program in Mechanical Engineering Federal Universi Russia Suspensys Automotive Systems RS Caxias do Sul Brazil

This study comprehensively describes the application of linear electromagnetic actuators in automotive suspension systems, focusing on the electromagnetic force necessary in suspension systems operating in passive, semi-active, and active modes and their capability for energy regeneration. The use of electromagnetic actuators as an alternative to traditional shock absorbers makes easy the energy harvesting that is typically lost during vertical vehicle displacement. An initial sizing technique for dimensioning electromagnetic actuators is applied to estimate the requirements for heavy vehicles. Experimental tests are conducted to validate the proposed method and assess the performance of the electromagnetic actuator in the suspension system for passive, semi-active, and active operations. A suitable extrapolation of the validated data is performed to determine the feasibility of the application of the proposed solution for heavy vehicles and identify potential applications and markets based on the road conditions of the ISO 8608 standard. This study offers a comprehensive approach to determining the actuator force for the suspension system and/or studying its potential for energy regeneration. As a result, it becomes possible to analyze the viability of the actuator replacement and provides important insights for further research and development. © 2023 SAE International. All rights reserved.

关键词： Shock absorbers

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Bringing Bearing Fault Detection to Embedded Systems Using Low-Cost Machine Learning Techniques

Bringing Bearing Fault Detection to Embedded Systems Using L...

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2024 IEEE Latin American Conference on Computational Intelligence, LA-CCI 2024

作者： Teixeira, Natalia S. Pastrana, M.A. Moura, Henrique G. Munoz, Daniel M. University of Brasilia Faculty of Gama Automotive Engineering Undergraduate Program Brasilia Brazil University of Brasilia Department of Mechanical Engineering Mechatronics Graduate Program Brasilia Brazil University of Brasilia Faculty of Gama Electronics Engineering Undergraduate Program Brasilia Brazil

ISBN: (纸本)9798350374575

Vibration analysis is crucial for predictive maintenance of bearing systems, aiming to reduce costs and prevent failures. This paper investigates signal processing techniques such as FFTs and Hilbert Transforms for fault diagnosis, alongside decision tree models, particularly the J48 algorithm within the WEKA environment, for fault classification. The study emphasizes the integration of signal processing and machine learning for effective fault diagnosis and maintenance. Notably, a classification model with low computational cost has been chosen, facilitating implementation in embedded systems. This model also offers interpretability of outputs, as it is based on decision trees of frequency components obtained through preprocessing. © 2024 IEEE.

关键词： Predictive maintenance

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Sub-optimal Perceptron Controller Using WOA Algorithm for Farming Watering Mobile Robot

Sub-optimal Perceptron Controller Using WOA Algorithm for Fa...

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2024 IEEE Latin American Conference on Computational Intelligence, LA-CCI 2024

作者： Pastrana, M.A. Oliveira, L.H. Bautista, J. Pinto-Lopera, Jesus Mendoza-Penaloza, Jose Munoz, Daniel M. University of the Amazonia Faculty of Engineering Systems Undergraduate Program Florencia Caquetá Colombia University of Brasilia Mechatronics Graduate Program Department of Mechanical Engineering Brasilia Brazil University of Brasilia Faculty of Gama Electronics Engineering Undergraduate Program Brasilia Brazil

ISBN: (纸本)9798350374575

Artificial neural networks (ANNs) are intricate mathematical models, drawing inspiration from the biological nervous system, and offering intelligence alongside nonparametric capabilities. The efficacy of ANNs heavily relies on their learning process. Heuristic search algorithms have been proposed in literature as reliable options for optimizing neural networks utilizing the Perceptron architecture. This paper presents an suboptimal neural network Perceptron training method employing the Whale Optimization Algorithm for the application of farming watering mobile robots. To achieve this, a fitness function based on system responses such as overshoot, settling Time, and steady-state Error was developed. The sub-optimal Perceptron controller was then implemented using MATLAB, CoppeliaSim software and the EVA robot, resulting in a 66.17% overshoot, a 4.7% steady-state error, and a settling time of 3.05 seconds. Moreover, the sub-optimal Perceptron controller was mapped onto a System on Chip FPGA AMD-Xilinx Zynq 7020, resulting in a hardware resources consumption of 1,870 (3.52%) Lookup table, 2 (0.9%) Digital Signal Processing blocks, 1,019 (0.96%) Flip-Flops and a power consumtion of 0.005 W. Finally, Hardware-in-The-Loop validation was performed using CoppeliaSim, Python, Universal Direct Memory Access, and the EVA robot. The results showed an overshoot of 94.83%, a settling time of 2 seconds, and a steady-state error of 4.5%. © 2024 IEEE.

关键词： MATLAB

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An Electrochemical HbA1c Immunosensor With a Simple Electrode of Gold Nanoparticle Monolayer

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IEEE Sensors Journal 2023年第15期23卷 16579-16584页

作者： Tseng, Chun-Chiang Lin, Ying-Ting Wang, Gou-Jen National Chung-Hsing University Department of Mechanical Engineering Taichung40227 Taiwan National Chung-Hsing University Program in Tissue Engineering and Regenerative Medicine Taichung40227 Taiwan National Chung-Hsing University Department of Mechanical Engineering The Graduate Institute of Biomedical Engineering Taichung40227 Taiwan

This study developed a novel electrochemical glycosylated hemoglobin (HbA1c) immunosensor. Polyethylene terephthalate (PET) was used as a substrate. After gold (Au) film sputtering on the PET surface, 1,6-hexanedithol with thiol groups on both terminals was used as an intermediary to attach a monolayer of uniformly distributed Au nanoparticles (AuNPs) to the Au thin film to form a nanostructured electrode. HbA1c antibodies were successfully immobilized on the AuNP monolayer via the self-assembled monolayer (SAM) approach. To mimic a real clinical detection environment, a calibration curve for HbA1c detection was performed in a mixture solution containing heparin sodium, red blood cell (RBC) lysis buffer, artificial human serum, and hemoglobin. The experimental results revealed that the proposed HbA1c immunosensor detected HbA1c in a linear range from 2500 to 10 000 ng/mL with a limit of detection of 2253 ng/mL. The developed HbA1c-sensing chip offers the advantages of simple operation, low cost, short detection time, and provides high feasibility for clinical application. © 2001-2012 IEEE.

关键词： Gold nanoparticles

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A Novel SERS Substrate Containing Silver Nanoparticle-Deposited Photoresist Microcone Array for Sensitive Biosensing

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IEEE Sensors Journal 2024年第2期24卷 1398-1404页

作者： Lin, Ying-Ting Wang, Sheng-Hsiang Tseng, Yu-Hsin Lin, Ze-Cheng Chen, Jyun-Tu Chang, Cheng-Chung Wang, Gou-Jen National Chung Hsing University Program in Tissue Engineering and Regenerative Medicine Taichung40227 Taiwan National Chung Hsing University Department of Mechanical Engineering Taichung40227 Taiwan Graduate Institute of Biomedical Engineering National Chung Hsing University Taichung40227 Taiwan

In this study, we developed a novel surface-enhanced Raman scattering (SERS) substrate formed by depositing silver nanoparticles (AgNPs) on a silver thin film-coated photoresist (PR) microcone array. The semiconductor photolithographic process was adopted for fabricating the PR microcone array. The hotspot enhancement effect of the SERS substrates was optimized by adjusting the concentration of the trisodium citrate, which was used as a reducing agent and a stabilizing agent for the synthesis of AgNPs. Experimental results showed that the proposed SERS substrate could detect the indicating peaks of Rhodamine 6G (R6G) at a relatively low concentration of 10-12 M. A standard detection curve for HbA1c detection with a linear detection range of 5000-20000 ng/mL with good linearity of 0.994 and a limit of detection (LOD) of 850.2 ng/mL was further established by adding HbA1c agent to artificial blood to simulate a real environmental condition. Recovery rate detection experiments confirmed the reproducibility of the established standard detection curve. © 2001-2012 IEEE.

关键词： Silver nanoparticles

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Materials science and engineering studies in mechanical engineering Department – high temperature deformation, microstructural control and welding/ joining technology

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Keikinzoku/Journal of Japan Institute of Light Metals 2023年第6期73卷 286-296页

作者： Takayama, Yoshimasa Mechanical and Intelligent Engineering Program Graduate School of Regional Development and Creativity Utsunomiya University 7-1-2 Yoto Utsunomiya-shi Tochigi321-8585 Japan

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Experimental study on open-end correction of a Helmholtz resonator narrow slit neck

Noise Control Engineering Journal

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Noise Control engineering Journal 2022年第2期70卷 128-135页

作者： Sakamoto, Shuichi Akiba, Yuki Iizuka, Ryo Watanabe, Shunsuke Kominami, Ryota Shintani, Tetsushi Mechanical Engineering Program Faculty of Engineering Niigata University Niigata Japan Graduate School of Science and Technology Niigata University Niigata Japan

In general, the acoustic effective length of the open end of an air column is longer than its geometric length. Here, the effective increment of the geometric length of an air column is called the open-end correction length, which is an acoustically crucial issue. The purpose of this study is to experimentally clarify the open-end correction length for a slit shape with a narrow clearance. For this reason, the sound absorption coefficient was measured using a sample in which the neck of the Helmholtz resonator was shaped as a slit with a narrow clearance. Next, the open-end correction length (i.e., mass end correction length and resistive end correction length) was calculated backward by comparing the experimental and theoretical sound absorption curves. The resistive end correction increased as the slit width became narrower within the range of 0.5 mm or less for both the center slit and the slit near the wall, indicating a significant discrepancy between the theoretical equation and the estimated value. For the mass end correction, in the case the center slit, the estimated value is close to the theoretical value of in the slit width range from 0.3 mm to 1.0 mm. The results of this study may be useful in eliminating discrepancies in correction values for open-end correction in slits with narrow clearance. © 2022 Institute of Noise Control engineering.

关键词： Acoustic wave absorption

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Project Edubot: Exploring Pedagogical Approaches in High School Robotics Education 16

Project Edubot: Exploring Pedagogical Approaches in High Sch...

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16th Brazilian Symposium on Robotics and 15th Workshop on Robotics in Education, SBR-WRE 2024

作者： Nunes Daltro, Isabela Silva Santos, João Victor de Sousa, Guilherme Barbosa Martins, Rodrigo Pastrana, M.A. de Souza Baptista, Roberto Mechatronics Engineering Undergraduate Program University of Brasilia DF Brasilia Brazil Department of Mechanical Engineering Mechatronics Graduate Program University of Brasilia DF Brasilia Brazil Faculty of Gama Electronics Engineering Undergraduate Program University of Brasilia DF Brasilia Brazil

ISBN: (纸本)9798350391084

This study focus on passive and active learning within the context of robotics education on public high schools. By synthesizing research findings and practical insights, this paper offers valuable recommendations for educators aiming to optimize the delivery of robotics education in public high schools, addressing the significance of the utilization of appropriate resources and technologies to support effective instruction. We implemented two distinct teaching methodologies to compare and study students’ reactions and learning outcomes: Group A experienced a passive methodology, while Group B engaged with an active methodology. We conducted a survey and the results show that the majority of the students prefer the active approach used in classes. ©2024 IEEE.

关键词： Contrastive Learning

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