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Research and design of elderly health monitoring and anti-fall positioning alarm device based on STM32 4

Research and design of elderly health monitoring and anti-fa...

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4th International Conference on Advanced Electronic Materials, Computers and Software Engineering, AEMCSE 2021

作者： Shen, Lei Xu, An-Fei Xi, Ziqiang Wang, Chaoran Zhao, Mengzhen Hubei University of Technology Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Wuhan430068 China

ISBN: (纸本)9781665415965

With the economic development and the improvement of living standards, the aging problem has become more and more serious, and the health and safety of the elderly have also attracted much attention. In order to detect and rescue the elderly when they fall and monitor the vital signs of the elderly in real time, this paper designs an elderly health monitoring and fall prevention positioning alarm device. The device is based on STM32 single chip microcomputer system and adopts modular design. It is equipped with SIM800 C mobile communication module and GPS positioning module. When the old man falls unexpectedly and does not stand up in a certain period of time, the device automatically calls the bound guardian's cell phone and sends SMS to display the location and state of the old man. Sensors such as body temperature, heart rate and step number are integrated to detect the health data of the elderly in real time, and alarm quickly when the data are abnormal. At the same time, cloud monitoring app is developed based on E4A platform to monitor the physical state of the elderly in real time. The experimental results show that the device can correctly identify most fall states, and the false alarm rate and missed alarm rate are low. It can effectively distinguish fall and daily life behavior. The test accuracy reaches 92 %, and has high stability and reliability. © 2021 IEEE.

关键词： Mobile telecommunication systems

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A Modified SVM Strategy for Single-Phase Cascaded Photovoltaic Inverter 5

A Modified SVM Strategy for Single-Phase Cascaded Photovolta...

引用

5th International Conference on New Energy and Future Energy system, NEFES 2020

作者： Xiong, L. Zhu, Y.J. Zhang, W.Y. Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China

The DC voltage imbalance of a single-phase cascaded photovoltaic inverter will decrease the quality of output voltage. The general modulation method needs to add power balance control to restrain the imbalance and make the control system complicated. To address the issue, a modified Space Vector Modulation (SVM) method is presented in this paper. The modulation method combines the DC voltage control of each unit with the modulation method to achieve DC voltage control of each unit in vector selection, eliminating the need for additional power balance control, thereby simplifying the control system. The modified space vector modulation can not only make the DC voltage rapidly track the DC voltage instruction of each cell through vector selection but also ensure the quality of output voltage waveform when the DC voltage of each cell is imbalanced. The effectiveness of the modified SVM method is verified, and the simulation model has built by using MATlab.Simulink. © Published under licence by IOP Publishing Ltd.

关键词： Control systems

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Research on a novel power quality conditioner with PV for electrified railway 3

Research on a novel power quality conditioner with PV for el...

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3rd International Conference on New Energy and Future Energy system, NEFES 2018

作者： Wang, Q. Zhang, C.Z. Shu, Y.H. Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China

With the fast development of electric railway, harmonics and reactive power problems caused by electric locomotive load remains to be further improved. This paper presents a novel power quality conditioner based on multiple H-bridges with photovoltaic power. The proposed structure utilizes a hybrid cascaded 81-level converter in series with a PWM converter to achieve a high-voltage and large-capacity power quality conditioner, and photovoltaic power connects with the DC bus side of the hybrid cascaded 81-level converter to reduce active consumption for electric railway. The fundamental voltage of the hybrid cascaded 81-level converter is controlled by the traction network. The active component of the PWM converter output current is controlled by DC link voltage of the hybrid cascaded 81-level converter, and its reactive and harmonic components are controlled by reactive and harmonic currents from the load. The system structure, working principle and control method of the novel power quality regulator are analysed. A single-phase traction system simulation model is built in MATlab.Simulink. Simulation results are presented to verify the feasibility and effectiveness of the proposed PQC. © Published under licence by IOP Publishing Ltd.

关键词： Power quality

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A Novel Wind DC Microgrid Energy Management Strategy Based on LSTM forecast Model 6

A Novel Wind DC Microgrid Energy Management Strategy Based o...

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2021 6th International Symposium on Advances in Electrical, Electronics and Computer Engineering, ISAEECE 2021

作者： Hui, Liu Fang, Lin Dihuang, Chen Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China

In order to improve the accuracy of wind power DC microgrid scheduling, especially in the case of LSTM prediction errors, this paper proposes a WOA optimized DC microgrid energy scheduling control strategy based on LSTM prediction algorithm. MATlab.software is used to simulate the scheduling process. Compared with the traditional LSTM-PID method, the WOA scheduling control strategy reduces the average absolute deviation of the SOC from 0.7043 to 0.1755, a reduction of 75.08%. While the median absolute deviation decreases from 0.5812 to 0.1316, a reduction of 77.36%. © Published under licence by IOP Publishing Ltd.

关键词： MATlab

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Wind Power Short-Term Forecasting Based on LSTM Neural Network with Dragonfly Algorithm 5

Wind Power Short-Term Forecasting Based on LSTM Neural Netwo...

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2020 5th International Seminar on Computer Technology, Mechanical and Electrical Engineering, ISCME 2020

作者： Liu, Hui Chen, Dihuang Lin, Fang Wan, Zhouli Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China

The volatility and randomness of wind energy limit its large-scale usage in power systems. Accurate short-term wind power prediction can provide effective criteria for wind energy parallel in the grid and provide favorable conditions for the commercial utilization of wind energy. Therefore, the paper proposes a short-term wind power prediction model based on the dragonfly algorithm optimize long-term and short-term neural networks. Firstly, the model preprocesses the collected data and divides the data into a training set and a testing set. Then, the DA used the training set to optimize the relevant hyperparameters in the long and short-term memory neural network. Finally, the DA-LSTM prediction model constructed with excellent hyperparameters will use the test set to obtain the prediction results. The simulation results of the examples show that, compared with the GWO-BP, ELM, and LSTM models, the DA-LSTM model can effectively use time series data for short-term forecasting of wind power and has higher prediction accuracy. © Published under licence by IOP Publishing Ltd.

关键词： Wind power

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Research on Ultrasonic Power Supply Based on Cascade Buck Technology 5

Research on Ultrasonic Power Supply Based on Cascade Buck Te...

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5th International Conference on New Energy and Future Energy system, NEFES 2020

作者： Zhang, W.Y. Zhang, C.Z. Zhou, C.H. Zhu, Y.J. Shu, Y.H. Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China

In view of the large voltage harmonics and low power density of the low-power ultrasonic power supply, a low-power ultrasonic power supply based on the cascade buck technology is proposed. The converter of the power supply is composed of two buck units in cascade, and the output of the unit is forward Sinusoidal half-wave DC voltage waveform, and then commutated by the full-bridge inverter every half cycle to output sine wave AC voltage waveform, can significantly reduce the voltage harmonics of the ultrasonic power supply, reduce the inductance of the matching network, and improve the ultrasonic wave Power density. Through the combination of voltage and current phase detection and PI regulator, the tracking resonance frequency is controlled. By analyzing the system structure, working principle and control strategy of the ultrasonic power supply, modeling and simulation are carried out on Matlab./ Simulink, and the feasibility and effectiveness of the scheme are verified. © Published under licence by IOP Publishing Ltd.

关键词： MATlab

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Simulation and implementation of DPWM algorithm for NPC three-level inverter 2

Simulation and implementation of DPWM algorithm for NPC thre...

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2nd International Conference on Computer Information Science and Application Technology, CISAT 2019

作者： Hang, Xia Jie, Zhang Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Hubei Province Wuhan430068 China

The application of discontinuous pulse width modulation (DPWM) in high-power inverters can effectively improve the equivalent switching frequency of the inverter and improve the control performance of the system. In this paper, the DPWM3 algorithm of NPC type three-level inverter is researched in detail from the judgment of the sector where the reference vector is located, the calculation of the action time of the space vector, and the selection of the switching sequence. Finally, simulation and experimental results verify the rationality of the proposed algorithm. It provides a certain reference value for the research of NPC three-level inverter discontinuous pulse width modulation algorithm. © Published under licence by IOP Publishing Ltd.

关键词： Pulse width modulation

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Design of driving power supply with high isolation and small coupling capacitance based on current transformere

Design of driving power supply with high isolation and small...

引用

2019 International Conference on Civil Engineering, Environment Resources and Energy Materials, CCESEM 2019

作者： Zhang, Daojian Xiong, Lan Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Hubei Province Wuhan430068 China

General drive power supply can not meet the requirements of high-voltage isolation under high-voltage and high-frequency (HV-HF) conditions, and the larger coupling capacitance of general power supply will bring common-mode noise. In this paper, a 10kV isolation power supply with 1.55pF low coupling capacitance and multiple output is designed. The power supply adopts LCL-T resonant circuit to produce a 100kHz current source. The current transformer is used to isolate the power supply, which realizes high voltage isolation and small coupling capacitance. The number of output circuits is changed by increasing or decreasing the magnetic core. © Published under licence by IOP Publishing Ltd.

关键词： Resonant circuits

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PS-TTL: Prototype-based Soft-lab.ls and Test-Time Learning for Few-shot Object Detection 24

PS-TTL: Prototype-based Soft-labels and Test-Time Learning f...

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32nd ACM International Conference on Multimedia, MM 2024

作者： Gao, Yingjie Zhang, Yanan Huang, Ziyue Liu, Nanqing Huang, Di SKLCCSE Beihang University Beijing China SIST Southwest Jiaotong University Chengdu China Zhejiang Industrial Big Data and Robot Intelligent System Key Lab. Hangzhou China

ISBN: (纸本)9798400706868

In recent years, Few-Shot Object Detection (FSOD) has gained widespread attention and made significant progress due to its ability to build models with a good generalization power using extremely limited annotated data. The fine-tuning based paradigm is currently dominating this field, where detectors are initially pre-trained on base classes with sufficient samples and then fine-tuned on novel ones with few samples, but the scarcity of lab.led samples of novel classes greatly interferes precisely fitting their data distribution, thus hampering the performance. To address this issue, we propose a new framework for FSOD, namely Prototype-based Soft-lab.ls and Test-Time Learning (PS-TTL). Specifically, we design a Test-Time Learning (TTL) module that employs a mean-teacher network for self-training to discover novel instances from test data, allowing detectors to learn better representations and classifiers for novel classes. Furthermore, we notice that even though relatively low-confidence pseudo-lab.ls exhibit classification confusion, they still tend to recall foreground. We thus develop a Prototype-based Soft-lab.ls (PS) strategy through assessing similarities between low-confidence pseudo-lab.ls and category prototypes as soft-lab.ls to unleash their potential, which substantially mitigates the constraints posed by few-shot samples. Extensive experiments on both the VOC and COCO benchmarks show that PS-TTL achieves the state-of-the-art, highlighting its effectiveness. The code and model are availab.e at https://***/gaoyingjay/PS-TTL. © 2024 ACM.

关键词： Object recognition

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Study of aerodynamic characteristics in hard disk drives by numerical simulation

Study of aerodynamic characteristics in hard disk drives by ...

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Asia-Pacific Magnetic Recording Conference, APMRC 2000

作者： Shimizu, H. Tokuyama, M. Imai, S. Nakamura, S. Sakai, K. Mechanical Engineering Reserch Lab. Hitachi Ltd. 502 Kandatu TsuchiuraIbaraki300-0013 Japan Data Storage and Retrieval System Division Hitachi Ltd. 2880 Kozu OdawaraKanagawa256-8510 Japan

ISBN: (纸本)0780362543

The behavior of the air flow inside a hard disk drive is evaluated by a three-dimensional unsteady-flow analysis technique called large eddy simulation (LES). The simulation shows that the fluctuation of the aerodynamic force is strongly correlated with the amplitude of the disk vibration, which causes positioning error of the read/write head. It also shows that the power loss caused by the friction of the air on the disks, which accounts for most of the power consumption of hard disk drives at a high-speed revolution, can be qualitatively predicted. © 2000 IEEE.

关键词： Large eddy simulation

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