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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Wai-Kit Sou Rui P. Martins Chi-Seng Lam State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macau China Institute of Microelectronics University of Macau Macau China Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macau China On leave from Instituto Superior Técnico Universidade de Lisboa Lisbon Portugal

ISBN: (数字)9798350394085

ISBN: (纸本)9798350394092

The Thyristor-controlled LC-coupling hybrid active power filter (TCLC-HAPF) exhibits the characteristics of low DC-link voltage and a wide reactive power compensation range, making it a promising compensator for medium-voltage-level power systems power quality conditioning. Conventional finite-set model predictive control (FS-MPC) typically utilizes a single switching vector in each control period, resulting in a variable switching frequency and noticeable output ripple. This article addresses these concerns by presenting an enhanced MPC that incorporates a fixed switching frequency, thereby resolving these challenges. Preliminary simulation studies are provided to verify the feasibility and performance of the proposed method.

关键词： Industrial electronics Reactive power Switching frequency Power quality Switches Active filters Control systems

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Preliminary Investigation of Electromagnetic Compatibility Analysis for Magnetic Resonance Human Body Communication

Preliminary Investigation of Electromagnetic Compatibility A...

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Cross Strait Quad-Regional Radio science and Wireless technology Conference (CSRWTC)

作者： Shaoze Jiang Han Wang Dongming Li Jiamei Wang Sio Hang Pun Mang I. Vai Yueming Gao Nan'an Public Security Bureau Quanzhou City Fujian Province China College of Physics and Information Engineering Fuzhou University China The International Joint Laboratory on Health Intelligent Monitoring Systems Fuzhou University China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau China Faculty of Science and Technology University of Macau China

ISBN: (数字)9798331507794

ISBN: (纸本)9798331507800

This paper presents a preliminary exploration of the electromagnetic distribution and electromagnetic compatibility issues related to Magnetic Resonance Human Body Communication (MR-HBC) technology. Through the design of magnetic resonant coils and finite element simulation analysis, the distribution of magnetic field strength and current density within the human body was evaluated. The results indicate that both the magnetic field strength and current density decrease logarithmically as the depth within the body increases (from 10 mm to 150 mm). Notably, high coupling strength remains relatively stable within a depth of 50 mm. Further analysis confirms that the induced currents in MR-HBC are dominated by variations in the magnetic field, exhibiting the volume conductor characteristics of human tissue under specific conditions. MR-HBC technology demonstrates excellent electromagnetic biocompatibility, with current density at operational frequencies well below safety limits, thereby providing a safe foundation and theoretical basis for the application of implanted and wearable medical devices.

关键词： Medical devices Magnetic resonance Medical services Electromagnetic compatibility Safety Finite element analysis Magnetic analysis Magnetic fields Current density Electromagnetics

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Development of a Pupillary Plant Model for Investigating the Effects of Range Nonlinearity on Pupil Size Variability signal

Development of a Pupillary Plant Model for Investigating the...

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IEEE Region 10 International Conference TENCON

作者： Kevin Hung Bingo Wing-Kuen Ling Daniel Hung-Kay Chow Sio-Hang Pun Gary Man-Tat Man School of Science and Technology Hong Kong Metropolitan University Hong Kong School of Information Engineering Guangdong University of Technology Guangdong Province PRC Department of Health and Physical Education The Education University of Hong Kong Hong Kong State key Laboratory of Analog and Mixed Signal VLSI University of Macau Macau

ISBN: (数字)9798350350821

ISBN: (纸本)9798350350838

Pupil Size Variability (PSV), referring to the continuous fluctuation of pupil size without visual accommodation or light stimulation, results from the coupling of cardiovascular regulation signals from the brainstem to the pupil. This phenomenon can provide useful trend data for assessing the condition of the Autonomic Nervous System (ANS). It has been proposed that PSV can be monitored through a mobile health (m-health) system in the form of smart eyewear. The pupillary plant displays a range nonlinearity (RNL) property, causing the level of pupil size fluctuations to change nonlinearly with the mean pupil size. Before PSV can be accurately used to estimate ANS condition, a deeper understanding of the biomechanical mechanisms behind RNL is required. A model incorporating the biomechanical properties of the pupillary muscle plant and the regulation of the ANS has been developed to simulate PSV under the effects of RNL. Our study found that RNL contributes to a nonlinear lowpass filtering effect. The simulation results suggest that a compensation technique will be necessary for estimating ANS condition based on PSV.

关键词： Biomechanics Visualization Fluctuations Filtering Biological system modeling Simulation Muscles Regulation Pupils Monitoring

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Maximizing hydrogen evolution via Co-Ni dual atoms and nanoclusters on hierarchically ordered porous carbon framework

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science China Materials 2024年第10期67卷 3197-3205页

作者： Qian Li Pan Zhang Huaiguang Li Yuan Wang Dongsheng Tang Qun Li Jiabin Wu Synergetic Innovation Center for Quantum Effects and Application Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of EducationCollege of Physics and Information ScienceHunan Normal UniversityChangsha 410081China National Key Laboratory of Advanced Micro and Nano Manufacture Technology School of Integrated CircuitsPeking UniversityBeijing 100871China The Chinese University of Hong Kong ShenzhenShenzhen 518172China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication&CAS Center for Excellence in Nanoscience National Center for Nanoscience and TechnologyBeijing 100190China Department of Chemistry Tsinghua UniversityBeijing 100084China Insititute of Microelectronics State Key Laboratory of Analog and Mixed-Signal VLSIUniversity of MacaoMacao 519000China

Efficient hydrogen production through water splitting relies on the development of high-performance catalysts for the hydrogen evolution reaction(HER).In this study,we synthesized the CoNi SAs@NPs-NC catalyst using multi-metal single-crystal ordered macroporous metal-organic frameworks(MOFs)as *** catalyst features a hierarchical porous structure with ordered macropores and micropores,which not only provides a high specific surface area but also promotes efficient mass ***,the incorporation of bimetallic components,coupled with synergistic interactions between single atoms(SAs)and nanoparticles(NPs),significantly enhances its catalytic *** CoNi SAs@NPs-NC nanocatalysts demonstrated exceptional activity in the HER,recording overpotentials of 90 mV in 1 M KOH and 61 mV in 0.5 M H_(2)SO_(4),both at a current density of 10 mA cm^(−2).In addition,density functional theory(DFT)analysis was employed to investigate the synergistic interactions among CoNi NPs,SAs,and nitrogen *** finding highlights the promising potential of the CoNi SAs@NPs-NC catalyst for efficient hydrogen evolution,making it a valuable candidate for advancing the field of water splitting.

关键词： three dimensional ordered macroporous Co-Ni dual atoms Co-Ni nanoclusters HER synergistic effect

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Model and Data Hybrid Reinforcement Learning for Optimal Voltage-Current Control of Hybrid Active Power Filter

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IEEE Transactions on Power Electronics 2025年

作者： Gong, Cheng Lam, Chi-Seng University of Macau State Key Laboratory of Analog and Mixed-Signal VLSI 999078 China University of Macau Institute of Microelectronics 999078 China University of Alberta Department of Electrical and Computer Engineering EdmontonAB Canada University of Macau Department of Electrical and Computer Engineering Faculty of Science and Technology 999078 China

In this paper, a novel design for optimal voltage and current control (OVCC) is introduced, employing a hybrid model-data reinforcement learning (MDRL) approach for hybrid active power filters (HAPF). High steady-state accuracy and rapid dynamic response are achieved by the MDRL-based OVCC, which also maintains low sampling and computational demands. The limitations of dynamic response, inherent in traditional control methods that require significantly lower bandwidth for DC voltage control compared to AC current control, are effectively addressed. Initially, a circuit configuration and mathematical model for the HAPF are proposed. Subsequently, an MDRL-OVCC structure for optimal control is established. The training of the MDRL-OVCC is conducted using an online robust policy iteration method, and the safety of the system is ensured through a proposed robust stability analysis. Comprehensive simulation and experimental results are presented, demonstrating the superior performance of the MDRL-OVCC compared to existing state-of-the-art methods. © 1986-2012 IEEE.

关键词： Optimal control systems

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An Improved Pseudo-Resistor with Well-Biased Technique and Proportional Calibration Technique for Neural Amplifiers

An Improved Pseudo-Resistor with Well-Biased Technique and P...

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IEEE Biomedical Circuits and Systems (BIOCAS)

作者： Yu Xia Liyang Wang Ruihan Zheng Hong Liang Loo Hung Chun Li Yanyan Xu Baijun Zhang Zhen Yuan Sio Hang Pun State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macau China Li ngyange Semiconductor Incorporated Joint Laboratory of Zhuhai UM Science and Technology Research Institution Zhuhai School of Electronics and Information Technology Sun Yat-sen University Guangzhou China Faculty of Health Sciences Centre for Cognitive and Brain Sciences University of Macau Taipa Macau SAR China

ISBN: (数字)9798350354959

ISBN: (纸本)9798350354966

Pseudo-resistors are widely used in neural amplifiers to generate a very low cut-off frequency and avoid DC offset while recording neural signals. However, conventional pseudo-resistors suffer from process variation, temperature variation and body leakage problems, leading to neural amplifier saturation and even instability. To solve these problems, an improved pseudo-resistor is designed with a well-biased technique to minimize the body leakage current and with the proportional calibration technique to achieve process and temperature robustness. The improved pseudo-resistor could achieve a $208.997 \mathrm{G} \Omega$ at 1000 Hz with 8.3% process variation and with mean crossed voltage(caused by body leakage current) 19.1 mV with 0.97% process variation within three standard deviations. The improved pseudo-resistor’s resistance varies by 3.4% and crossed voltage varies by 10 mV with the temperature from $0^{\circ} \mathrm{C}$ to $100^{\circ} \mathrm{C}$. As proof of concept, a capacitively coupled neural amplifier with this improved pseudo-resistor is also designed for testing. This work is designed using a 65 nm process.

关键词： Temperature Simulation Voltage Robustness Calibration Recording Leakage currents Standards Immune system Testing

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Boundary conditions analysis of circular capacitive micromachined ultrasonic transducer (CMUT) devices

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Recent Patents on Engineering 2021年第3期15卷 287-293页

作者： Wang, Jiujiang Yu, Yuanyu Kuang, Jiangming Zhang, Shuang Xu, Jing Liu, Xin Data Recovery Key Laboratory of Sichuan Province College of Computer Science Neijiang Normal University Nei-jiang641100 China BeiDou and Wisdom Medical Doctor Workstation Neijiang Normal University Neijiang641110 China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macau999078 China

Background: Capacitive Micromachined Ultrasonic Transducer (CMUT) is a new type of ultrasound transducer that has gained much research interest in ultrasound imaging because of its wider bandwidth, higher receiving sensitivity, and is more likely to be integrated with an integrated circuit (IC). The analytical solution is intuitive, fast, and convergent among simulation methods. The membrane deflection is important to the CMUT performance. The deformation of a circular CMUT under an external force can be described by von Kármán equations. Objective: To find suitable boundary conditions that are crucial for the governing equations to be properly solved to get the analytical solutions for membrane deformation. Methods: Features of two commonly used CMUT fabrication methods, Sacrificial Release method (SR) and Wafer Bonding (WB) method, are introduced. The force and moment equilibrium conditions of the supporting post are analyzed to get the boundary condition equations. Results: The analytical results match well with the Finite Element Method (FEM) results for the fixed boundary condition while there are still some differences for the elastic boundary condition. Conclusion: The boundary conditions for SR fabricated devices are elastic support while the boundary conditions for WB fabricated devices are fixed. © 2021 Bentham science Publishers.

关键词： Fabrication

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Initial Study of Emotion Recognition Using Brain Rhythm Sequencing Method 1

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11th Asian-Pacific Conference on Medical and Biological Engineering, APCMBE 2020

作者： Li, Jia Wen Barma, Shovan Pun, Sio Hang Vai, Mang I. Wang, Pan Ke Liu, Xin Yu, Yuan Yu Wang, Jiu Jiang Zhang, Shuang Mak, Peng Un Institute of Microelectronics University of Macau China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau China Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau China Guwahati India College of Computer Science and AI Neijiang Normal University Neijiang China

ISBN: (数字)9783030661694

ISBN: (纸本)9783030661687

A method named brain rhythm sequencing has been proposed to interpret Electroencephalography (EEG) signal for emotion recognition. For this purpose, first, the reassigned smoothed pseudo Wigner-Ville distribution (RSPWVD) has been adopted. Then, all generated sequences have been evaluated for classifying the emotional states based on arousal and valence. Moreover, the classification was by similarity measurements between pairwise of the sequences. After evaluating the accuracies by using the sequences from different channels and time durations, on one hand, the significant channel for classification has been identified so that the recognition can be accomplished by considering single-channel. On the other hand, the particular duration which was valuable for classification has been found so that the size of required data can be reduced. Thus, emotion recognition can be performed by fewer data resource. Results revealed that the accuracy of ~70% has been realized and hence, the proposed method could open a new way to implement data analysis for EEG-based applications such as emotion recognition. © 2021, Springer Nature Switzerland AG.

关键词： Electroencephalography

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Preliminary Research on Super-Regenerative Receiver for Intracardiac Communication

Preliminary Research on Super-Regenerative Receiver for Intr...

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Cross Strait Quad-Regional Radio science and Wireless technology Conference (CSRWTC)

作者： Xueyu Weng Dongming Li Wenxiang Zhao Sio Hang Pun Mang I. Vai Yueming Gao College of Advanced Manufacturing Fuzhou University China The International Joint Laboratory on Health Intelligent Monitoring Systems Fuzhou University China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau China Faculty of Science and Technology University of Macau China College of Physics and Information Engineering Fuzhou University China

Existing commercial pacemakers only provide single-chamber pacing and cannot achieve multi-chamber sequential pacing. Conduction Intracardiac Communication(CIC) has the characteristics of low power consumption and high security, which is very suitable for communication between multi-chamber leadless pacemakers. Because the pacemaker needs to be implanted into the heart, which limits its volume, power consumption, and other related parameters, and the super-regenerative circuit has its low power consumption and simple circuit structure, the super-regenerative receiver scheme is a good choice for intracardial communication where power consumption is the main problem. In this paper, a prototype super-regenerative receiver suitable for intracardiac communication is proposed. The differential instrument amplifier with high input impedance is used to filter out the external electromagnetic interference, reduce the input equivalent noise, and improve the signal-to-noise ratio. A super-regenerative oscillator and a filter amplifier circuit are designed to enhance the effectiveness and reliability of the communication. The experimental results show that the bit error rate of the circuit is lower than $\boldsymbolsignal \times \boldsymbol{10^{-5}}$ for the received signal of -92 dBm.

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Fast Phase Demodulation Method for Heterodyne Phase-Sensitive OTDR

Fast Phase Demodulation Method for Heterodyne Phase-Sensitiv...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Shuaiqi Liu Feihong Yu Liyang Shao Mang I Vai Department of Electronic and Electrical Engineering Southern University of Science and Technology Shenzhen China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macau S.A.R. China

We propose a fast and effective phase demodulation method based on the spatial phase shifting technique for heterodyne phase-sensitive OTDR. An orthogonal signal can be directly obtained using the spatially shifted original signal, without the need for digital I/Q demodulation or Hilbert transform. The proposed method has experimentally demonstrated at least 30% phase demodulation speed improvement with no deterioration in the demodulation results compared to the conventional methods. This technique may prove useful for practical distributed acoustic sensing applications, because of its simpler computation process and faster computation speed.

关键词： Optical fibers Optical mixing Transforms Reflectometry Acoustics Real-time systems Optical reflection

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