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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 *** battery is designed to balance the supply and the demand of power under different irradiation *** on conventional cascaded Dc-Dc converters,the proposed design is developed with the single switch technique reducing size,cost and power *** 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 *** a result,the PWM and PFM modules regulate the two stages of the proposed circuit separately with the same switching control *** this paper,the modes of operation of the circuit are discussed as well as the control *** 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)

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 *** model can be simplified into two parts:a control circuit and a variable *** can be used to easily verify theoretical presumptions about the switching properties of *** LDR-based memristor model can also be used in both simulations and experiments for future research into memristor *** paper includes mathematical models,simulations,and experimental results.

关键词： analogue model light-dependent resistor memristor simulator

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

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 ***, we derive the general formulae of the impedances for the conventional and fractional-order filter circuit *** 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 ***, 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

A Prepaid Smart Metering Scheme Based on WiMAX Prepaid Accounting Model

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Smart Grid and Renewable Energy 2010年第2期1卷 63-69页

作者： Reduan h. Khan Tanzim F. Aditi Victor Sreeram herbert h. c. iu 不详

Prepaid energy meters have been widely adopted by utilities in different countries across the world as an innovative solution to the problem of affordability and consumption management. however, the present smart card based systems have some inherent problems like added cost, low availability and lack of security. In the future Smart Grid paradigm, use of smart meters can completely overhaul these prepaid systems by introducing centralized accounting, monitoring and credit-control functions using state-of-the-art telecommunication technologies like WiMAX. In this paper we pro-pose a prepaid smart metering scheme for Smart Grid application based on centralized authentication and charging using the WiMAX prepaid accounting model. We then discuss its specific application to Demand Response and Roam-ing of Electrical Vehicles.

关键词： Smart Metering WiMAX Smart Grid Demand Response Electric Vehicles

A Simpler Memristor Emulator Based on Varactor Diode

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chinese Physics Letters 2018年第5期35卷 144-147页

作者： Dong-Sheng Yu Ting-Ting Sun ci-Yan Zheng h.h.c.iu T.Fernando School of Electrieal and Power Engineering China University of Mining and TechnologyXuzhou 221116 School of Electrical Electronic and Computer EngineeringThe University of Western AustraliaPerth WA 6009Australia

A new memristor（MR） emulator is designed by making use of only three current-feedback operational amplifiers,one varactor diode, one capacitor and five resistors. As compared with other reported MR emulators, only three active devices and ten components in total are required for realizing this MR emulator, and hence this emulator can be regarded as a simpler one for the moment. The results obtained by Multisim simulation and experimental prototypes are given to verify the practicality and feasibility of this MR emulator.

关键词： MR As

A study of different annealing schedules in SARNA-predict A permutation based SA algorithm for RNA folding

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International Journal of Intelligent computing and cybernetics 2015年第2期8卷 152-171页

作者： herbert h.Tsang Kay c.Wiese Applied Research Lab Trinity Western UniversityLangleyCanada School of computing Science Simon Fraser UniversitySurreyCanada

Purpose–The purpose of this paper is to present a study of the effect of different types of annealing schedules for a ribonucleic acid(RNA)secondary structure prediction algorithm based on simulated annealing(SA).Design/methodology/approach–An RNA folding algorithm was implemented that assembles the final structure from potential substructures(helixes).Structures are encoded as a permutation of *** SA searches this space of *** and annealing schedules were studied and fine-tuned to optimize algorithm ***–In comparing with mfold,the SA algorithm shows comparable results(in terms of F-measure)even with a less sophisticated thermodynamic *** terms of average specificity,the SA algorithm has provided surpassing *** limitations/implications–Most of the underlying thermodynamic models are too simplistic and incomplete to accurately model the free energy for larger *** is the largest limitation of free energy-based RNA folding algorithms in *** implications–The algorithm offers a different approach that can be used in practice to fold RNA sequences ***/value–The algorithm is one of only two SA-based RNA folding *** authors use a very different encoding,based on permutation of candidate *** in depth study of annealing schedules and other parameters makes the algorithm a strong *** benefit is that new thermodynamic models can be incorporated with relative ease(which is not the case for algorithms based on dynamic programming).

关键词： Annealing schedule Simulated annealing RNA secondary structure prediction Ribonucleic acid RNA folding Permutation

Avian introgression in the genomic era

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Avian Research 2017年第4期8卷 181-191页

作者： Jente Ottenburghs Robert h.S.Kraus Pim van hooft Sipke E.van Wieren Ronald c.Ydenberg herbert h.T.Prins Resource Ecology Group Wageningen UniversityDroevendaalsesteeg 3a6708 PB WageningenThe Netherlands Department of Biology University of Konstanz78457 ConstanceGermany Department of Migration and Immuno-Ecology Max Planck Institute for OrnithologyAm Obstberg 178315 RadolfzellGermany centre of Wildlife Ecology Simon Fraser UniversityBurnabyBC V5A 1S6Canada

Introgression,the incorporation of genetic material from one(sub)species into the gene pool of another by means of hybridization and backcrossing,is a common phenomenon in birds and can provide important insights into the speciation *** the last decade,the toolkit for studying introgression has expanded together with the development of molecular *** this review,we explore how genomic data,the most recent step in this methodological progress,impacts different aspects in the study of avian ***,the detection of hybrids and backcrosses has improved *** most widely used software package is *** discordance(*** loci resulting in discordant gene trees) is another means for the detection of introgression,although it should be regarded as a starting point for further analyses,not as a definitive proof of ***,disentangling introgression from other biological processes,such as incomplete lineage sorting,remains a challenging endeavour,although new techniques,such as the D-statistic,are being *** addition,phylogenetics might require a shift from trees to ***,the study of hybrid zones by means of geographical or genomic cline analysis has led to important insights into the complex interplay between hybridization and ***,because each hybrid zone study is just a single snapshot of a complex and continuously changing interaction,hybrid zones should be studied across different temporal and/or spatial scales.A third powerful tool is the genome *** debate on which evolutionary processes underlie the genomic landscape is still ongoing,as is the question whether loci involved in reproductive isolation cluster together in ‘islands of speciation' or whether they are scattered throughout the *** genomic landscapes across the avian tree of life will be an exciting field for further ***,the findings from these different methods shoul

关键词： Admixture cline theory D-statictic Genomic landscape hybridization Phylogenetic discordance

Synthesis of Fréchet-type dendritic homotriptycenes

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Science china chemistry 2009年第7期52卷 1051-1056页

作者： MEIER herbert School of chemistry and chemical Engineering South China University of Technology Institute of Organic chemistry University of Mainz

A rapid and efficient synthesis of novel dendrimer homotriptycenes is presented. The dendronized 9,10-dihydroanthracen-9-ols 4, having high electron densities in the benzene rings of the Fréchet-type dendrons, exhibited in the presence of acid a quantitative transannular ring closure to the corresponding dendritic homotriptycenes. The electron-donating Fréchet-type dendrons enabled the intramolecular Fc alkylation by a regioselective 1,7-elimination of h2O.

关键词： carbenium ions dendrimers ring closure reaction triptycene homotriptycene