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Pacific Rim Conference on Lasers and Electro-optics (CLEO/Pacific Rim)

作者： Liheng Shi Jinxu Zhang Yingying GU Fangqin Gai Jing Liu Guanhao Wu Department of Precision Instrument State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing China Research Center of Opto-electronic Sensing Yangtze Delta Region Institute of Tsinghua University Zhejiang Zhejiang China Space Optoelectronic Measurement and Perception Lab. Beijing Institute of Control Engineering Beijing China National Key Laboratory of Space Intelligent Control China Academy of Space Technology Beijing China

We introduce a method for measuring three degrees of freedom using low-coherence light and temporal phase-shifting to discern position and orientation from the coherence envelope shape, enabling direct measurement wit... 详细信息

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Phase measurement Shape Shape measurement Measurement by laser beam Coherence Position measurement Lasers and electrooptics

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Predictive direct power control of three-phase PWM rectifier based on TOGI grid voltage sensor free algorithm

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Journal of Measurement Science and Instrumentation 2022年第4期13卷 451-459页

作者： ZHAO Feng LI Shute CHEN Xiaoqiang WANG Ying GAN Yanqi NIU Xinqiang ZHANG Fan School of Automation&Electrical Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Key Lab of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong UniversityLanzhou 730070China

In predictive direct power control(PDPC)system of three-phase pulse width modulation(PWM)rectifier,grid voltage sensor makes the whole system more complex and ***,third-order generalized integrator(TOGI)is used to generate orthogonal signals with the same frequency to estimate the grid *** addition,in view of the deviation between actual and reference power in the three-phase PWM rectifier traditional PDPC strategy,a power correction link is designed to correct the power reference *** grid voltage sensor free algorithm based on TOGI and the corrected PDPC strategy are applied to three-phase PWM rectifier and simulated on the simulation *** results show that the proposed method can effectively eliminate the power tracking deviation and the grid *** effectiveness of the proposed method is verified by comparing the simulation results.

关键词： three-phase PWM rectifier predictive direct power control grid voltage sensor free algorithm third-order generalized integrator power correction

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Deep and Localized Transcranial Magnetic Stimulation in Rat Using Conventional Round Coil

Deep and Localized Transcranial Magnetic Stimulation in Rat ...

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General Assembly and Scientific Symposium, URSI

作者： Mai. Lu Shoogo Ueno Key Lab. of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong University Lanzhou Gansu China Graduate School of Engineering Kyushu University Fukuoka Japan

Transcranial magnetic stimulation (TMS) shows significant values in both brain research and therapeutic applications in the treatment of various psychiatric and neurological disorders. Animal studies of TMS plays an important role in understanding of the cellular and molecular mechanisms underlying TMS induced effects in the brain. This work investigated TMS in rat brain by employing conventional round coil with varied coil positions. Three dimensional distributions of induced electric field in realistic rat model were calculated by 3-D impedance method. Simulations results indicated that the conventional round coil can be applied to rat TMS with improved focality while also keeping high stimulation intensities in deep brain regions.

关键词： Neurological diseases Solid modeling Impedance measurement Transcranial magnetic stimulation Simulation Rats Brain modeling

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intelligent Mobile Power Sharing and Rental System Based on BeiDou Navigation

Intelligent Mobile Power Sharing and Rental System Based on ...

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electronic Information technology and Smart Agriculture (ICEITSA), International Conference on

作者： Hui Hu Xinhu Li Jiaxin Wu Qingli Zeng Renmin Zhang College of Communication and Electronic Engineering Jishou University Jishou Hunan P.R. China Hunan Provincial Key Lab. of Intelligent Control Technology for Ecological Agriculture in Wuling Mountain Area Huaihua University Huaihua Hunan P.R. China

ISBN: (纸本)9781665464024

Aiming at the problems that the mobile power supply in the market cannot output AC voltage and manually adjustable DC voltage at the same time, expensive and cannot be accurately located, an intelligent mobile power sharing and rental system based on BeiDou navigation is designed. The device mainly consists of three major parts: power circuit module, controller module and mobile APP, which solves a series of problems such as location finding, rental use, visual power management and positioning return of shared power by users. The power circuit module converts the battery voltage into 220V AC output and adjustable DC precision output. The controller module realizes the functions of power supply DC output voltage collection, Battery power Detection, Beidou positioning and data uploading to the server. The mobile APP realizes the functions such as displaying the location, voltage, power and other data of multiple power supply units and sharing the rental under the shared rental mode by the APP. The system realized in this paper can greatly promote the development of China's shared energy storage industry and effectively change the current dilemma that people have difficulties in using electricity outdoors.

关键词： Smart agriculture Visualization Technological innovation Costs Power supplies Navigation Voltage

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Research on Adaptive Navigation System of Mountain Orchard Plant Protection Unmanned Aerial Vehicle Based on Simultaneous Localization and Mapping and Global Navigation Satellite System Fusion

Research on Adaptive Navigation System of Mountain Orchard P...

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electronic Information technology and Smart Agriculture (ICEITSA), International Conference on

作者： Xuan Ouyang Xujun Liu Xiangkai Xu Yingjing Qian Qingli Zeng College of Communication and Electronic Engineering Jishou University Jishou Hunan P.R. China College of Automation and Electronic Information Xiangtan University Xiangtan Hunan P.R. China Hunan Provincial Key Lab. of Intelligent Control Technology for Ecological Agriculture in Wuling Mountain Area Huaihua University Huaihua Hunan P.R. China

ISBN: (纸本)9781665464024

China's western terrain is dominated by mountains, plateaus and basins, and the east is dominated by plains and hills. The mountainous area occupies 2/3 of the total national area. Due to the restriction of terrain conditions, the mechanization degree of orchard management is not high, and the lab.r intensity of fruit farmers is large and the cost is high. The desire of fruit farmers for orchard mechanization management and protection is very urgent. This system in view of the four rotor unmanned aerial vehicle developed a terrain adaptive landing gear, analysis of the terrain recognition algorithm, combined with mountain orchard plant protection drone operation requirements, the plant protection drones take operation line extraction method, the optimal path for homework, according to the characteristics of the fruit tree distribution research combines visual simultaneous localization and mapping technology and global navigation satellite system technology level of unmanned aerial vehicle navigation control method, It is of great research and economic value to combine the above methods and build an adaptive navigation control system suitable for quadrotor plant protection unmanned aerial vehicle operation in mountain orchards, and to establish an adaptive navigation system for mountain orchard plant protection unmanned aerial vehicle.

关键词： Solid modeling Global navigation satellite system Adaptive systems Simultaneous localization and mapping Gears Autonomous aerial vehicles control systems

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Edge Detection Operator for Underwater Target Image 3

Edge Detection Operator for Underwater Target Image

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3rd IEEE International Conference on Image, Vision and Computing, ICIVC 2018

作者： Xiaoheng, Dong Minghang, Li Jiashu, Miao Zhengyu, Wang Shanghai Marine Electronic Equipment Research Institute Shanghai China Shanghai University Key Lab. of Intelligent Manufacturing and Robotics School of Mechatronic Engineering and Automation Shanghai China Shanghai Aerospace Control Technology Institute Shanghai China

ISBN: (纸本)9781538649916

Image edge detection is an important basis for image recognition extraction. The traditional segmentation algorithm can't effectively extract important edge information of digital image. In view of the low contrast and edge blur of underwater image, a new feature based on wavelet transform Edge extraction algorithm has been proposed. On the basis of this, an edge detection method based on the details of two-dimensional image wavelet decomposition is further studied. This method eliminates a large number of remaining edges and false edges, and the feature edge of the image is extracted effectively, so it provides reliable information for the subsequent target recognition. © 2018 IEEE.

关键词： Wavelet decomposition

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2D Structured Turbo Compressed Sensing for Channel Estimation in OTFS Systems

2D Structured Turbo Compressed Sensing for Channel Estimatio...

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International Conference on Communication Systems

作者： Mingchen Zhang Fanggang Wang Xiaojun Yuan Lei Chen Center for Intelligent Networking and Commun National Key Lab. of Sci. and Tech. on Commun University of Electronic Sci. and Tech. of China Chengdu China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China School of Information Science and Technology ShanghaiTech University Shanghai China

ISBN: (纸本)9781538678657;9781538678640

High-speed mobility is a challenging scenario in wireless communications since it involves fast-varying channels, in which orthogonal frequency-division multiplexing (OFDM) could degrade significantly without accurate Doppler compensation. Recently, a modulation called orthogonal time frequency space (OTFS) was proposed for the specific scenario. The advantages are two-fold, i.e., the orthogonality in the time-frequency domain and the clustered sparsity of channel information in the delay-Doppler domain. In this paper, we propose a two-dimensional structured Turbo compressed sensing (CS) algorithm based on our previous work on Turbo CS for fast time-varying channel estimation. Markov random field is applied to model the clustered sparse prior of the channel in the two-dimensional delay-Doppler domain. In contrast to the conventional Turbo CS, a two-dimensional structured minimum mean-square error (MMSE) estimator is designed by message passing over a Markov random field. The convergence and the MSE performance of the proposed algorithm is evaluated, and the simulation results validate that the proposed algorithm outperforms the existing algorithms.

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Deep transcranial magnetic stimulation using deformed halo-circular assembly coil 7

Deep transcranial magnetic stimulation using deformed halo-c...

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7th Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2016

作者： Lu, Mai Dong, Xu-Wei Ueno, Shoogo Key Lab. of Opt-Electronic Technology and Intelligent Control Lanzhou Jiaotong University Ministry of Education Lanzhou730070 China Department of Applied Quantum Physics Graduate School of Engineering Kyushu University Fukuoka812-8581 Japan

ISBN: (纸本)9781467394949

Direct stimulation of deeper brain tissues by transcranial magnetic stimulation (dTMS) plays an important role in the study of reward and motivation mechanisms, which may be beneficial in the treatment of several neurological and psychiatric disorders. This paper presents numerical simulation of dTMS by considering the deformed Halo-circular assembly coil (dHCA coil). Three-dimensional distributions of the induced magnetic field and electric field in realistic head model by applying the dHCA coil were obtained by impedance method, and the results were compared with the normal Halo-circular assembly coil (HCA coil). The improved stimulation focality with reasonable stimulation depth can be achieved by employing the dHCA coil. © 2016 IEEE.

关键词： Electric fields

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Implementation of Hodgkin-Huxley neuron model in FPGAs

Implementation of Hodgkin-Huxley neuron model in FPGAs

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Mai Lu Jin-Long Wang Jia Wen Xu-Wei Dong Ministry of Education Key Lab. of Opt-Electronic Technology and Intelligent Control (Lanzhou Jiaotong University) Lanzhou China

ISBN: (纸本)9781467383103

In this paper, the biophysically plausible neuron model i.e. the Hodgkin-Huxley neuron model has been implemented in the field programmable gate arrays (FPGAs) by employing Altera DSP Builder. The action potential generated by Hodgkin-Huxley neurons implemented in FPGA has been compared with the numerical prediction, leading to a good agreement between them. It is believed that this approach could greatly speed up simulations of both highly complex single neuron model and network of neurons.

关键词： Neurons Mathematical model Field programmable gate arrays MATlab

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Age-dependent of Electromagnetic Absorption in Human Endocrine Glands for Using Mobile Phones

Age-dependent of Electromagnetic Absorption in Human Endocri...

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Progress in Electromagnetic Research Symposium

作者： Mai Lu Xiao-Yan Wu Key Lab. of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong University Department of Endocrinology The First Hospital of Lanzhou University

ISBN: (纸本)9781509060948

With the quick development and widespread use of mobile phones, especially mobile phones by children, has led to a rising concern about the possible adverse health effects of radio frequency electromagnetic field exposure. This study aims to present the dosimetry analysis of the electromagnetic fields induced by mobile phones on the endocrine glands for both child and adult. A finite-difference time-domain method was employed to calculate the specific absorption rate in the realistic child and adult head-neck models from exposure to a generic handset at 1750 MHz. The results show that the locally induced specific absorption rate in endocrine glands of child is larger than that of adult. The thyroid gland is the most exposed organ compared to the hypophysis and hypothalamus glands. In all of the examined cases, the specific absorption rate values in endocrine glands of child and adult are below the IEEE safety standard.

关键词： Endocrine Glands Mobile phones Specific absorption rate Child electromagnetic absorption Electromagnetic fields Infant Adverse Reaction Pituitary gland Adults Thyroid Gland

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