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检索条件"机构=Key Lab of Opt-Electronic Technology and Intelligent Control of Minisitry of Education"

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Performance Prediction of Dual-band Power Divider Using Multi-layer Fully Connected Neural Network 13

Performance Prediction of Dual-band Power Divider Using Mult...

引用

13th International Conference on Microwave and Millimeter Wave technology, ICMMT 2021

作者： Sun, Siyue Zhou, Wenying Zhu, Yabo Lanzhou Jiaotong University Key Lab Of Opt-Electronic Technology And Intelligent Control Of Ministry Of Education Lanzhou730070 China School Of Physical Science And Technology Lanzhou University Gansu Lanzhou730000 China School Of Electronic And Information Engineering Lanzhou Jiaotong University Gansu Lanzhou730070 China

ISBN: (纸本)9781665434379

Using multi-layer fully connected neural network (FCNN), this paper provides a predictive analysis on the geometric parameters and corresponding performance of the proposed dual-band coupled line power divider. The results show that the trained network can quickly and effectively predict S-parameters of the proposed power divider with varying geometric parameters in correspondence to different resonant frequency. The prediction results match the simulated values of EM-simulation and meet the requirements of engineering design, which demonstrates the advantage of using multilayer FCNN to design power divider. © 2021 IEEE.

关键词： Scattering parameters

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A Dual-function Quasi-static Magnetic Device with Cloaking and Concentrating Functions Simultaneously

A Dual-function Quasi-static Magnetic Device with Cloaking a...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Chen, Hanchuan Liu, Yichao Sun, Fei Taiyuan University of Technology Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan030024 China

ISBN: (纸本)9798350375909

In previous study, many single-function static/quasi-static magnetic devices, such as cloak and concentrator, have been designed base on transformation optics. However, few have explored devices capable of simultaneously generating two different functions on the static/quasi-static magnetic field. In this study, we propose a dual-function quasi-static magnetic device, which can create a concealed region and concentrated region for quasi-static magnetic field simultaneously. The dual-function quasi-static magnetic device is designed via twice extreme spatial stretching transformation and magnetic null medium, which can be realized by using arrays of superconductors and ferromagnetic materials in specific arrangement. The simulated results verify the performance of the proposed dual-function quasi-static magnetic device, which can simultaneously achieve cloaking and concentrating effect for the magnetic field from DC to 1000 Hz. The quasi-static magnetic field can be enhanced 9 times than the background magnetic field when the side lengths of the internal square pillar and external square pillar of the proposed structure are selected as a = 10 mm and b = 90 mm, respectively. Moreover, the concentrating ratio obtained from theoretical calculation fits well with the results obtained through numerical simulation. The dual-function quasi-static magnetic device designed in this study may have essential application in medical testing for special occasions. © 2024 IEEE.

关键词： Wigglers

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Electromagnetic-acoustic Beam Compressor by Double-physical-fields Null Medium

Electromagnetic-acoustic Beam Compressor by Double-physical-...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Sun, Ran Sun, Fei Liu, Yichao Zhang, Zeyu Yang, Chao Taiyuan University of Technology Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan030024 China

ISBN: (纸本)9798350375909

In this study, double-physical-fields null medium, i.e., a subwavelength air channels surrounded by a carefully arranged metal plates, is utilized to design an electromagnetic-acoustic beam compressor capable of simultaneously compressing electromagnetic waves and acoustic waves. Numerical simulation results verify its ability to simultaneously produce the expected compression ratios for both electromagnetic waves and acoustic waves. Moreover, the compression ratio precisely matches the geometric size ratio of the input and output planes of the compressor. This work may have potential applications in electromagnetic-acoustic coupling systems and electromagnetic-acoustic processing/detection. © 2024 IEEE.

关键词： Acoustic waves

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Design of the MIMO Antenna for Mobile Communication Terminal

Design of the MIMO Antenna for Mobile Communication Terminal

引用

Progress in Electromagnetic Research Symposium (PIERS)

作者： Yuxin Li Wenying Zhou Jinjing Xu Key Lab of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong University Lanzhou China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

The MIMO antenna for mobile communication terminals is proposed for improving its communication ability in different networks. It can avoid the problem of signal attenuation and poor signal quality caused by antenna band mismatch. The dimension of the overall antenna size is 58mm×120mm (0.68λ 0 ×1.41λ 0 , where λ 0 is the wavelength of 3.5GHz). The MIMO antenna can cover the following areas: GSM 1800, UMTS, LTE, and 5G band N78. The proposed antenna consists of two types of radiating units, including an E-type radiating unit and an L-type radiating unit. The E-type radiating unit contains two frequency bands of 1.71 ∼ 1.75GHz and 3.36 ∼ 3.61GHz respectively, which is worked for GSM1800 and 5G band N78. The L-type radiating unit covers 2.58 ∼ 2.69GHz, after moving the L-type patch, it can cover 2.05 ∼ 2.17GHz, which works for UMTS and 5G band LTE. The E-type patch antenna is center symmetric loaded to improve the gain of the proposed MIMO antenna. The simulation results show that the antenna’s efficiency is higher than 80% in 2.1GHz, 2.6GHz, and 3.5GHz bands with ECC (Envelope Correlation Coefficient) less than 0.16. A prototype of the proposed 6-antenna array is manufactured and measured. The measurement results show a return loss of 8.72dB and an isolation of 14.83dB, basically consistent with simulation results. It is also worth noticing that the proposed antenna could operate in the highly anticipated next-generation Wi-Fi 6E.

关键词： Correlation coefficient 5G mobile communication Simulation 3G mobile communication Mobile antennas Loss measurement Antennas

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Radiation Effect Analysis on Human Head Caused by Different Frequencies of Mobile Phone Antenna

Radiation Effect Analysis on Human Head Caused by Different ...

引用

International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Xi-Yu Zhang Wen-Ying Zhou Key Lab of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong University Gansu Lanzhou

This article discusses the bio-electromagnetic effects of the human head who exposure to the different operation frequency of three kinds of mobile phones. Three kinds of exposure sources with microwave and millimeter-wave bands respectively, which include the dual-band PIFA antenna operating at 900 MHz and 1860 MHz, the patch antenna operating at 3.5 GHz and the dual-band millimeter-wave antenna operating at 27 GHz and 40 GHz. We take a three-layer ball head model as the human head, and use the COMSOL Multiphysics software to simulate the specific absorption rate (SAR) and the absorbed power density (Sab) and temperature rise performance in the human head. The maximum SAR in human head is 1.41 W/kg and 4.4 W/kg, when it exposed to the microwave antenna and millimeter-wave antenna respectively. The results show that the millimeter-wave antennas have higher radiation energy than the microwave antennas for the human head model. The radiation dose absorbed in the human tissues are all below the limit restriction.

关键词： Microwave antennas Microwave integrated circuits Radiation effects Dual band Mobile handsets Specific absorption rate Software

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A Quantized Kernel Least-mean-square Algorithm Based on Echo State Network for Online Time-series Prediction 11

A Quantized Kernel Least-mean-square Algorithm Based on Echo...

引用

11th International Conference on Information Science and technology, ICIST 2021

作者： Zhao, Chaochao Han, Min Wang, Jun Dalian University of Technology Faculty of Electronic Information and Electrical Engineering Dalian China Dalian University of Technology Key Lab. of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education Dalian China

ISBN: (纸本)9781665412667

Kernel least mean square (KLMS) algorithm is a popular method for online time-series prediction. It has the advantages of high robustness, low computational complexity, model simplicity, and online learning ability. Unfortunately, as input data grows, its dictionary size increases and the computational complexity rises significantly. In addition, how to improve the adaptability in uncertain environments with noise is also one of the main challenges. In this paper, we propose a Quantized Kernel Least-mean-square Based on Echo State Network (ES-QKLMS) algorithm in response to the above problems. In the new algorithm, the reservoirs of the echo state network (ESN) are integrated with the KLMS algorithm for online prediction. The ESN reservoir can store the associated information of historical data, which improves the algorithm's ability to track temporal characteristics. Then, the vector quantization method is adopted to suppress the size of the KLMS dictionary. Moreover, the adaptive weight adjustment is used to improve the noise immunity in an uncertain environment. At last, The Lorenz time series and the El Nino-Southern Oscillation (ENSO) time series are discussed to demonstrate the efficacy of the ES-QKLMS algorithm. © 2021 IEEE.

关键词： Time series

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An Aerial Image Stitching Algorithm Based on Long-distance Features 11

An Aerial Image Stitching Algorithm Based on Long-distance F...

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11th International Conference on Information Science and technology, ICIST 2021

作者： Liu, Qiang Han, Min Wang, Jun Dalian University of Technology Faculty of Electronic Information and Electrical Engineering Dalian China Dalian University of Technology Key Lab. of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education Dalian China

ISBN: (纸本)9781665412667

Aerial image stitching is very important in obtaining UAV information. The Speeded Up Robust Features Algorithm (SURF) is an image matching method with high robustness. However, the SURF algorithm subjects to the problems of inexact edge positioning and low matching accuracy. In order to obtain high-precision aerial stitching images with high efficiency, an aerial image stitching algorithm based on long-distance features is proposed in this paper. First, the Canny-SURF algorithm is used for feature detection. After that, the Long-Fast Retina keypoint (L-FREAK) binary symbol is used to describe and match the feature points. Finally, the Random Sample Consensus Algorithm (RANSAC) is used to compute the projection transformation model, and the weighted average fusion algorithm is used to fuse the pixels. Experimental results show that the proposed algorithm is outperform the SIFT, SURF, ORB, and BRISK algorithms. The proposed algorithm has good stitching accuracy, and can stitch aerial images with wide rotation characteristics. © 2021 IEEE.

关键词： Antennas

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Implementation of Hodgkin-Huxley neuron model in FPGAs

Implementation of Hodgkin-Huxley neuron model in FPGAs

引用

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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Hierarchy-based extended CBBA for multi-robot task assignment

Hierarchy-based extended CBBA for multi-robot task assignmen...

引用

2022 Chinese Automation Congress, CAC 2022

作者： Liu, Jiajun Xia, Weiguo Li, Fuqiang Wang, Peng China National Aeronautical Radio Electronic Research Institute National Key Laboratory of Science and Technology on Avionics System Integration China Dalian University of Technology Key Lab. of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education School of Control Science and Engineering China

ISBN: (纸本)9781665465335

This paper studies the task assignment problem of a multi-robot system with complex constraints including the robot speed limit, the task execution time window constraints, the arrival time, the trip cost, and different priorities of the tasks. A new bidding function is then designed for each robot. Based on the k-means algorithm, a hierarchy-based extended consensus-based bundle algorithm (CBBA) is proposed to find the optimal solution for the task allocation problem. Finally, simulation examples are presented to show the feasibility of the proposed algorithm and comparisons with existing algorithms show that the proposed algorithm can reduce the task assignment time with guaranteed reward values. © 2022 IEEE.

关键词： Multipurpose robots

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Occupational Exposure of Therapeutic Staff in Deep Transcranial Magnetic Stimulation 35

Occupational Exposure of Therapeutic Staff in Deep Transcran...

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35th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2023

作者： Lu, Mai Ueno, Shoogo Lanzhou Jiaotong University Key Lab. of Opto-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou China The University of Tokyo Graduate School of Medicine Department of Biomedical Engineering Tokyo Japan

ISBN: (纸本)9789463968096

This study presented dosimetry analysis for therapeutic staff exposed to magnetic pulses from double cone and Halo-circular assembly (HCA) coils during deep transcranial magnetic stimulation (dTMS) applications. The magnetic field and the induced electric field in realistic human body model exposure to dTMS coils have been obtained by employing the impedance method. The exposure level by both double cone and HCA coils were assessed according to the limits defined by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines. The HCA coil generates higher exposure to therapeutic staff compared to that of double cone coil. © 2023 International Union of Radio Science.

关键词： Electric fields

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