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Research on Human Activity Recognition Algorithm Based on LSTM-1DCNN

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Computers, Materials & Continua 2023年第12期77卷 3325-3347页

作者： Yuesheng Zhao Xiaoling Wang Yutong Luo Muhammad Shamrooz Aslam School of Automation Guangxi University of Science and TechnologyLiuzhou545006China Student Mental Health Education center Guangxi University of Science and TechnologyLiuzhou545006China Artificial Intelligence Research Institute China University of Mining and TechnologyXuzhou221116China

With the rapid advancement of wearable devices,Human Activities Recognition(HAR)based on these devices has emerged as a prominent research field.The objective of this study is to enhance the recognition performance of HAR by proposing an LSTM-1DCNN recognition algorithm that utilizes a single triaxial accelerometer.This algorithm comprises two branches:one branch consists of a Long and Short-Term Memory Network(LSTM),while the other parallel branch incorporates a one-dimensional Convolutional Neural Network(1DCNN).The parallel architecture of LSTM-1DCNN initially extracts spatial and temporal features from the accelerometer data separately,which are then concatenated and fed into a fully connected neural network for information fusion.In the LSTM-1DCNN architecture,the 1DCNN branch primarily focuses on extracting spatial features during convolution operations,whereas the LSTM branch mainly captures temporal features.Nine sets of accelerometer data from five publicly available HAR datasets are employed for training and evaluation purposes.The performance of the proposed LSTM-1DCNN model is compared with five other HAR algorithms including Decision Tree,Random Forest,Support Vector Machine,1DCNN,and LSTM on these five public datasets.Experimental results demonstrate that the F1-score achieved by the proposed LSTM-1DCNN ranges from 90.36%to 99.68%,with a mean value of 96.22%and standard deviation of 0.03 across all evaluated metrics on these five public datasets-outperforming other existing HAR algorithms significantly in terms of evaluation metrics used in this study.Finally the proposed LSTM-1DCNN is validated in real-world applications by collecting acceleration data of seven human activities for training and testing purposes.Subsequently,the trained HAR algorithm is deployed on Android phones to evaluate its performance.Experimental results demonstrate that the proposed LSTM-1DCNN algorithm achieves an impressive F1-score of 97.67%on our self-built dataset.In conclusion,the fusion of temporal and spatial informa

关键词： Human activity recognition accelerometer CNN LSTM deployment temporal and spatial information

基于变分原理的自适应网格技术及其权函数问题研究(英文)

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Advances in Atmospheric Sciences 2002年第4期19卷 705-718页

作者：康红文谷湘潜柳崇健王鹏云 The Research center for Disastrous Weather Chinese Academy of Meteorological Sciences Beijing 100081

利用两个具有解析解的算例研究基于变分原理的自适应网格技术。结果表明,对运动激波算例,权函数考虑二阶导数项比考虑梯度项更能有效地减小误差;对气旋锋生算例,仅以梯度作为权函数亦不能提高精度,考虑速度场、锋生函数分布的权函数能... 详细信息

利用两个具有解析解的算例研究基于变分原理的自适应网格技术。结果表明,对运动激波算例,权函数考虑二阶导数项比考虑梯度项更能有效地减小误差;对气旋锋生算例,仅以梯度作为权函数亦不能提高精度,考虑速度场、锋生函数分布的权函数能更合理地安排网格;对照解析解,发现提出的自适应网格技术能明显提高计算精度,在节省内存等方面显示了突出的优点。

关键词：变分原理自适应网络权函数数值模拟气旋速度场运动激波

Implementation of advanced peripheral bus interface for MV10 MCU

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Journal of Shanghai University(English Edition) 2011年第4期15卷 287-291页

作者：胡越黎黄俊凉周俊 School of Mechatronics Engineering and Automation Shanghai University Micro-electronic Research and Development center Shanghai University

MV10 is an MCU which consists of PWM, ADC,CAN and some other function blocks. It is designed for car body＇s control. Advanced peripheral bus （APB） is a low speed AMBA bus connecting low-power peripherals. This paper presents an implementation of APB interface for MV10 MCU. After that, MV10 can be integrated into any AMBA system on chips （SoCs） easily. We have built a multi-core system with ABMA to verify this design, In this system ARM9 is a main processor mounted on AHB and MV10 acts as a low-power and low-speed slaver on APB. Before building this system, some operations are encapsulated into a task with dedicated ID. MV10 works as a co-processor with ARM by acquiring task ID from ARM. The result of simulation indicates that MCU can work well as expected. Based on our design, MV10 can be mounted on any AMBA system from now on.

关键词： MV10 MCU advanced peripheral bus （APB） system on chip （SoC）

Finite particle method for kinematically indeterminate bar assemblies

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第5期10卷 669-676页

作者： Ying YU Yao-zhi LUO Space Structures Research center Zhejiang University Hangzhou 310058 China

This study presents a structural analysis algorithm called the finite particle method (FPM) for kinematically indeterminate bar assemblies. Different from the traditional analysis method, FPM is based on the combination of the vector mechanics and numerical calculations. It models the analyzed domain composed of finite particles. Newton's second law is adopted to de-scribe the motions of all particles. A convected material frame and explicit time integration for the solution procedure is also adopted in this method. By using the FPM, there is no need to solve any nonlinear equations, to calculate the stiffness matrix or equilibrium matrix, which is very helpful in the analysis of kinematically indeterminate structures. The basic formulations for the space bar are derived, following its solution procedures for bar assemblies. Three numerical examples are analyzed using the FPM. Results obtained from both the straight pretension cable and the suspension cable assembly show that the FPM can produce a more accurate analysis result. The motion simulation of the four-bar space assembly demonstrates the capability of this method in the analysis of kinematically indeterminate structures.

关键词：粒子方法酒吧结构分析牛顿第二定律非线性方程组数值计算空间组合运动仿真

Burst behavior due to the quasimode excited by stimulated Brillouin scattering in high-intensity laser-plasma interactions

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High Power Laser Science and Engineering 2019年第4期7卷 1-7页

作者： Q.S.Feng L.H.Cao Z.J.Liu C.Y.Zheng X.T.He Institute of Applied Physics and Computational Mathematics Beijing 100094China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China Collaborative Innovation center of IFSA(CICIFSA) Shanghai Jiao Tong UniversityShanghai 200240China

The strong-coupling mode,called the"quasimode",is excited by stimulated Brillouin scattering(SBS)in high-intensity laser-plasma interactions.Also SBS of the quasimode competes with SBS of the fast mode(or slow mode)in multiion species plasmas,thus leading to a low-frequency burst behavior of SBS reflectivity.Competition between the quasimode and the ion-acoustic wave(IAW)is an important saturation mechanism of SBS in high-intensity laser-plasma interactions.These results give a clear explanation of the low-frequency periodic burst behavior of SBS and should be considered as a saturation mechanism of SBS in high-intensity laser-plasma interactions.

关键词： Brillouin amplification inertial confinement fusion ion-acoustic waves quasimode stimulated Brillouin scattering

Achieve load balancing with a dynamic re-routing CICQ switching scheme

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Science China(Information Sciences) 2012年第2期55卷 407-418页

作者： HU HongChao,GUO YunFei,YI Peng & LAN JuLong Department of Broadband Information Networks,National Digital Switching System Engineering & Technological R&D center(NDSC),Zhengzhou 450002,China Department of Broadband Information Networks National Digital Switching System Engineering & Technological R&D Center (NDSC) Zhengzhou China

Multi-path based routing and switching can achieve network-wide load balancing and reduce the port conflicts of switching devices.Motivated by this novel idea,in this paper,through analyzing the feasibility of implementing multi-next-hops in core switching networks comprehensively,we advance a switching scheme called MHRS(multi-next-hop re-routing switch)and a forwarding table management scheme called HMFT(hierarchical multi-stage forwarding table)to support multi-next-hop dynamical re-routing.MHRS implements dynamical re-routing in the switches according its congestion status to achieve real-time load balancing,while HMFT can provide traffic with different forwarding paths based on their QoS requirements.Theoretical analysis and simulation results show that switches equipped with HMFT and MHRS can provide good delay and throughput performance.Besides,they can reduce port conflicts significantly.

关键词： switching fabric scheduling policy load balancing dynamical re-routing

Lossless Digital Watermarking Scheme for Image Maps

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China Communications 2014年第8期11卷 125-130页

作者： SUN Jianguo ZHENG Chonghui GAO Di Research center of Data Secrecy and Secrecy Technology College of National SecrecyHarbin Engineering University Harbin 150001 Heilongjiang Province E R. China

A lossless digital watermarking scheme,which was zero- perturbation on the content and graphics for the digital image maps,is proposed.During the simulation,the scheme has been utilized to model the copyright protection program as a commerce application.Compared to the traditional digital watermarking schemes,our scheme operates in redundancy areas of maps and is scalable to topology changes.Experimental results show that,with respect to the geometric attacks and image transformed,the performance of our scheme is better than the classical algorithms based space or frequency domain with much lower complexity..

关键词：数字水印算法图像映射无损数字影像地图模拟过程商务应用保护程序拓扑变化

Active resilient defense control against false data injection attacks in smart grids

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Control Theory and Technology 2023年第4期21卷 515-529页

作者： Xiaoyuan Luo Lingjie Hou Xinyu Wang Ruiyang Gao Shuzheng Wang Xinping Guan School of Electrical Engineering Yanshan UniversityQinhuangdao066004HebeiChina School of Electrical Engineering Jiangsu Collaborative Innovation Center for Smart Distribution NetworkNanjing636600JiangsuChina School of Electronic and Electric Engineering Shanghai Jiao Tong UniversityShanghai200240China

The emerging of false data injection attacks(FDIAs)can fool the traditional detection methods by injecting false data,which has brought huge risks to the security of smart grids.For this reason,a resilient active defense control scheme based on interval observer detection is proposed in this paper to protect smart grids.The proposed active defense highlights the integration of detection and defense against FDIAs in smart girds.First,a dynamic physical grid model under FDIAs is modeled,in which model uncertainty and parameter uncertainty are taken into account.Then,an interval observer-based detection method against FDIAs is proposed,where a detection criteria using interval residual is put forward.Corresponding to the detection results,the resilient defense controller is triggered to defense the FDIAs if the system states are affected by FDIAs.Linear matrix inequality(LMI)approach is applied to design the resilient controller with H_(∞)performance.The system with the resilient defense controller can be robust to FDIAs and the gain of the resilient controller has a certain gain margin.Our active resilient defense approach can be built in real time and show accurate and quick respond to the injected FDIAs.The effectiveness of the proposed defense scheme is verified by the simulation results on an IEEE 30-bus grid system.

关键词： Active resilient defense Attack detection Cyber attacks Cyber-attack detection Cyber grid elements Cyber threat False data injection attack Smart grids security Interval observer

Dual transponder ranging performance in the presence of oscillator phase noise

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Journal of Central South University 2015年第4期22卷 1350-1357页

作者：赵明臣王春晖金小军金仲和 Department of Information Science and Electronic Engineering Zhejiang University Micro-Satellite Research center Zhejiang University

A dual transponder carrier ranging method can be used to measure inter-satellite distance with high precision by combining the reference and the to-and-fro measurements. Based on the differential techniques, the oscillator phase noise, which is the main error source for microwave ranging systems, can be significantly attenuated. Further, since the range measurements are derived on the same satellite, the dual transponder ranging system does not need a time tagging system to synchronize the two satellites. In view of the lack of oscillator noise analysis on the dual transponder ranging model, a comprehensive analysis of oscillator noise effects on ranging accuracy is provided. First, the dual transponder ranging system is described with emphasis on the detailed analysis of oscillator noise on measurement precision. Then, a high-fidelity numerical simulation approach based on the power spectrum density of an actual ultra-stable oscillator is carried out in both frequency domain and time domain to support the presented theoretical analysis. The simulation results under different conditions are consistent with the proposed concepts, which makes the results reliable. Besides, the results demonstrate that a high level of accuracy can be achieved by using this oscillator noise cancelation-oriented ranging method.

关键词：相位噪声振荡器转发测距性能数值模拟方法距离测量测距系统测距方法