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基于神经网络和光流场的嵌入式高速目标识别与跟踪（英文）

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中国公路学报 2015年第11期28卷 112-123页

作者：苏金泷 hERBERT h c iu FERNANDO T 西澳大学电气与电子工程学院泉州师范学院陈守仁工商信息学院福建泉州362000

研究了面向嵌入式硬件平台的高速视频图像处理与高速目标跟踪算法。基于神经网络的光流场算法能有效减少程序对硬件系统的内存要求和运算要求,该算法能够比传统算法更加容易的应用于以DSP(数字信号处理)芯片为核心的嵌入式硬件平台中。... 详细信息

研究了面向嵌入式硬件平台的高速视频图像处理与高速目标跟踪算法。基于神经网络的光流场算法能有效减少程序对硬件系统的内存要求和运算要求,该算法能够比传统算法更加容易的应用于以DSP(数字信号处理)芯片为核心的嵌入式硬件平台中。首先设计了一个基于hopfield神经网络控制器的自适应滤波器,以图像信噪比为控制指标,对需进行目标识别的视频图像进行图像预处理;然后,利用补偿模糊神经网络控制器对光流场计算方法进行优化,这是一种通过参数控制平滑度实现的平均速度的角度误差和标准角误差的cFNN(补偿模糊神经网络)控制器识别跟踪算法。微机仿真及嵌入式系统试验结果均表明:该算法能够在同等条件下显著提高目标辨别与跟踪能力,显示其具有较高的有效性和实用性。

关键词：交通工程图像去噪补偿模糊神经网络光流场目标识别

A Design of Single-Switch Two-Stage Dc-Dc converters With PWM And PFM for Off-Grid Solar Power System

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chinese Journal of Electrical Engineering 2017年第3期3卷 44-51页

作者： Junkai Zhao herbert h.c.iu Tyrone Fernando School of Electrical Electronic and Computer EngineeringThe University of Western Australia35 Stirling HighwayCrawleyWA 6009Australia

In this paper,a single-switch two-stage Dc-Dc conversion circuit is proposed for an off-grid solar power application.A photovoltaic(PV)panel powers the load and a storage unit(battery)via the proposed circuit.The battery is designed to balance the supply and the demand of power under different irradiation situations.Based on conventional cascaded Dc-Dc converters,the proposed design is developed with the single switch technique reducing size,cost and power loss.The control scheme in this design is pulse width modulation(PWM)with pulse frequency modulation(PFM).The PWM module is similar to conventional design except its ramp signal with a variable frequency is provided by a resettable integrator.As a result,the PWM and PFM modules regulate the two stages of the proposed circuit separately with the same switching control signal.In this paper,the modes of operation of the circuit are discussed as well as the control schemes.The design process is described along with the circuit analysis and comparisons with conventional design are made as well.A prototype has been built to verify the proposed circuit with simulation and experimental results.

关键词： Single-switch technique photovoltaic power system off-grid solar system Dc-Dc conversion resettable integrator pulse frequency modulation(PWM) pulse width modulation(PFM)

Mutator for transferring a memristor emulator into meminductive and memcapacitive circuits

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chinese Physics B 2014年第7期23卷 366-376页

作者：于东升梁燕 herbert h.c.iu 胡义华 School of Information and Electrical Engineering China University of Mining and Technology School of Electrical Electronic and Computer EngineeringThe University of Western Australia School of Electronic and Electrical Engineering University of Strathclyde

In this paper, a concise but effective interface circuit for transforming a memristor into meminductive and memcapac- itive systems is designed. This newly proposed interface circuit, constructed by only two current conveyors, is equipped with three available ports, which can provide six connecting combinations in terms of one resistor, one capacitor, and one memristor. For the sake of confirming the design effectiveness, theoretical and simulation discussions are hence introduced and all the experimental waveforms provide conclusive evidence to validate the correctness of these new mutators. The most attractive features of this new interface circuit are the floating terminals and convenient practical implementation.

关键词： memristor meminductive memcapacitive self-excited oscillator

Fractional-order L_βc_a filter circuit network

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chinese Physics B 2015年第8期24卷 149-158页

作者：洪铮钱晶陈帝伊 herbert h.c.iu college of Electric Power Engineering Kunming University of Science and Technology Department of Electrical Engineering Northwest A & F University School of Electrical Electronic and Computer Engineering The University of Western Australia

In this paper we introduce the new fundamentals of the conventional Lc filter circuit network in the fractional domain.First, we derive the general formulae of the impedances for the conventional and fractional-order filter circuit network.Based on this, the impedance characteristics and phase characteristics with respect to the system variables of the filter circuit network are studied in detail, which shows the greater flexibility of the fractional-order filter circuit network in design.Moreover, from the point of view of the filtering property, we systematically study the effects of the filter units and fractional orders on the amplitude–frequency characteristics and phase–frequency characteristics. In addition, numerical tables of the cut-off frequency are presented. Finally, two typical examples are presented to promote the industrial applications of the fractional-order filter circuit network. Numerical simulations are presented to verify the theoretical results introduced in this paper.

关键词： fractional-order circuit,circuit networks,amplitude–frequency characteristics,phase–frequency characteristics

hepatitis B virus genotypes in precision medicine of hepatitis Brelated hepatocellular carcinoma:Where we are now

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World Journal of Gastrointestinal Oncology 2024年第4期16卷 1097-1103页

作者： caecilia h c Sukowati Sri Jayanti Turyadi Turyadi David h Muljono claudio Tiribelli Eijkman Research center for Molecular Biology Research Organization for HealthNational Research and Innovation Agency of IndonesiaJakarta 10340Indonesia Liver cancer Unit Fondazione Italiana Fegato ONLUSTrieste 34149Italy Faculty of Medicine Hasanuddin UniversityMakassar 90245South SulawesiIndonesia Faculty of Medicine and health University of SydneySydney 2050Australia

hepatitis B virus(hBV)infection is a major player in chronic hepatitis B that may lead to the development of hepatocellular carcinoma(hcc).hBV genetics are diverse where it is classified into at least 9 genotypes(A to I)and 1 putative genotype(J),each with specific geographical distribution and possible different clinical outcomes in the patient.This diversity may be associated with the precision medicine for hBV-related hcc and the success of therapeutical approaches against hcc,related to different pathogenicity of the virus and host response.This Editorial discusses recent updates on whether the classification of hBV genetic diversity is still valid in terms of viral oncogenicity to the hcc and its precision medicine,in addition to the recent advances in cellular and molecular biology technologies.

关键词： hepatitis B virus hepatocellular carcinoma Genotypes Pathogenesis Precision medicine

Implementation of an analogue model of a memristor based on a light-dependent resistor

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chinese Physics B 2012年第10期21卷 500-507页

作者：王晓媛 Andrew L.Fitch herbert h.c.iu Victor Sreeram 齐维贵 School of Electrical Engineering Harbin Institute of Technology School of Electrical Electronicand Computer EngineeringThe University of Western Australia 35 Stirling HighwayCrawleyWA 6009Australia

In this paper,an analogue model of a memristor using a light-dependent resistor(LDR) is presented.This model can be simplified into two parts:a control circuit and a variable resistor.It can be used to easily verify theoretical presumptions about the switching properties of memristors.This LDR-based memristor model can also be used in both simulations and experiments for future research into memristor applications.The paper includes mathematical models,simulations,and experimental results.

关键词： analogue model light-dependent resistor memristor simulator

Machine learning prediction of magnetic properties of Fe-based metallic glasses considering glass forming ability

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Journal of Materials Science & Technology 2022年第8期103卷 113-120页

作者： Xin Li Guangcun Shan c.h.Shek School of Instrumentation Science and Opto-electronics Engineering Beihang UniversityBeijing 100191China Department of Materials Science and Engineering City University of Hong KongKowloon TongHong Kong SARChina

Fe-based metallic glasses(MGs)have shown great commercial values due to their excellent soft magnetic properties.Magnetism prediction with consideration of glass forming ability(GFA)is of great signifi-cance for developing novel functional Fe-based MGs.however,theories or models established based on condensed matter physics exhibit limited accuracy and some exceptions.In this work,based on 618 Fe-based MGs samples collected from published works,machine learning(ML)models were well trained to predict saturated magnetization(B_(s))of Fe-based MGs.GFA was treated as a feature using the experimental data of the supercooled liquid region(△T_(x)).Three ML algorithms,namely eXtreme gradient boosting(XGBoost),artificial neural networks(ANN)and random forest(RF),were studied.Through feature selection and hyperparameter tuning,XGBoost showed the best predictive performance on the randomly split test dataset with determination coefficient(R^(2))of 0.942,mean absolute percent error(MAPE)of 5.563%,and root mean squared error(RMSE)of 0.078 T.A variety of feature importance rankings derived by XGBoost models showed that T_(x) played an important role in the predictive performance of the models.This work showed the proposed ML method can simultaneously aggregate GFA and other features in ther-modynamics,kinetics and structures to predict the magnetic properties of Fe-based MGs with excellent accuracy.

关键词： Metallic glasses Soft magnetic properties Glass forming ability Machine learning Non-linear regression

Model-based adaptive locomotion and clustering control of microparticles through ultrasonic topological charge modulation

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Applied Mathematics and Mechanics(English Edition) 2023年第4期44卷 623-640页

作者： h.S.LEE h.X.cAO D.JUNG c.S.KIM School of Mechanical Engineering Chonnam National UniversityGwangju 61186South Korea Korea Institute of Medical Microrobotics Gwangju 61011South Korea

We present a novel motion control technique for microrobot clusters to exploit the characteristics of the ultrasonic field.The method comprises two steps,i.e.,introducing an ultrasonic actuation(UA)linear model for three-dimensional(3D)locomotion and controlling the topological charge(Tc)in the ultrasonic vortex for microrobot clustering.here,the Tc is a controllable parameter for the expansion and contraction of the pressure null space inside the vortex.We present a Tc control method to cluster sporadically distributed microrobots in a specific workspace.To validate the concept,a UA system composed of 30 ultrasonic transducers with 1 Mhz frequency is fabricated,and the characteristics of the generated acoustic pressure field are analyzed through simulations.Subsequently,the performances of the adaptive controller for precise 3D locomotion and the Tc control method for clustering are evaluated.Finally,the UA technology,which performs both clustering and locomotion in a complex manner,is validated with a gelatin phantom in an in-vitro environment.

关键词： ultrasonic actuation(UA) topological charge(Tc) adaptive control particle manipulation

construction of conservative Numerical Fluxes for the Entropy Split Method

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communications on Applied Mathematics and computation 2023年第2期5卷 653-678页

作者： Björn Sjögreen h.c.Yee Multid Analyses AB GothenburgSweden NASA Ames Research center Moffett FieldCA 94035USA

The entropy split method is based on the physical entropies of the thermally perfect gas Euler equations.The Euler flux derivatives are approximated as a sum of a conservative portion and a non-conservative portion in conjunction with summation-by-parts(SBP)difference boundary closure of(Gerritsen and Olsson in J comput Phys 129:245-262,1996;Olsson and Oliger in RIAcS Tech Rep 94.01,1994;Yee et al.in J comp Phys 162:33-81,2000).Sj?green and Yee(J Sci comput)recently proved that the entropy split method is entropy conservative and stable.Stand-ard high-order spatial central differencing as well as high order central spatial dispersion relation preserving(DRP)spatial differencing is part of the entropy stable split methodol-ogy framework.The current work is our first attempt to derive a high order conservative numerical flux for the non-conservative portion of the entropy splitting of the Euler flux derivatives.Due to the construction,this conservative numerical flux requires higher oper-ations count and is less stable than the original semi-conservative split method.however,the Tadmor entropy conservative(Ec)method(Tadmor in Acta Numerica 12:451-512,2003)of the same order requires more operations count than the new construction.Since the entropy split method is a semi-conservative skew-symmetric splitting of the Euler flux derivative,a modified nonlinear filter approach of(Yee et al.in J comput Phys 150:199-238,1999,J comp Phys 162:3381,2000;Yee and Sj?green in J comput Phys 225:910934,2007,high Order Filter Methods for Wide Range of compressible flow Speeds.Proceedings of the IcOSAhOM09,June 22-26,Trondheim,Norway,2009)is proposed in conjunction with the entropy split method as the base method for problems containing shock waves.Long-time integration of 2D and 3D test cases is included to show the com-parison of these new approaches.

关键词： Finite-difference method Entropy conservation Entropy splitting Shock capturing