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International Conference on Communication technology (ICCT)

作者： Tianyu Zheng Hui Zhang Lei Fei Luan Li Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University Tianjin China

D2D technology is a communication method in which two users can communicate directly by multiplexing cellular channels. Due to the existence of co-channel interference, research on resource allocation is particularly significant. We first describe the D2D communication scenario and discuss the difference of path loss model between D2D users and cellular users, then summarize the problem as an optimization model to maximize the multiplexed channel throughput. According to this optimization goal, a resource allocation algorithm based on immune theory is proposed, which can find the best multiplexed channels for D2D pairs. The simulation results show that the proposed algorithm can effectively improve the channel throughput compared with the existing literature algorithms.

关键词： Device-to-device communication Multiplexing Throughput Sociology Statistics Optimization Resource management

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Long-term ultra-precision phase synchronization technique for locking the repetition rate of OFCs based on FLOM-PD

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optoelectronics Letters 2022年第12期18卷 712-716页

作者： ZHOU Weifeng HAO Shijie CHEN Xing ZHANG Wanpeng YUE Zongjie WU Hong College of Electronic Information and Optical Engineering Nankai UniversityTianjin300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai UniversityTianjin300350China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing100876China Engineering Research Center of Thin Film Optoelectronics Technology Nankai UniversityTianjin300350China

Long-term ultra-precision synchronization between optical frequency combs(OFCs) and microwave oscillators is important for various fields, including scientific observation, smart grid, positioning and navigation, etc. Here, a phase-locked loop system based on fiber loop optical-microwave phase detector(FLOM-PD) is proposed to realize the synchronization of the repetition rate of OFCs and rubidium atomic clocks. Firstly, the scheme and locking process of the system are elaborated, then the mathematical model of the system is established, and the feasibility of the scheme is proved by theoretical analysis and experimental verification. After synchronization, the instability of the system reaches 8.69×10^(-12)at 1 s and 2.94×10^(-13)at 1 000 s, indicating that the phase synchronization system can achieve ultra-precision and stability of OFCs repetition rate.

关键词： synchronization repetition phase

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Two-person device-free localization system based on ZigBee and transformer

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High technology Letters 2024年第1期30卷 61-67页

作者：刘天蒙 YANG Hai xiao WU Hong School of Electronic Information and Optical Engineering Nankai UniversityTianjin 300350P.R.China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai UniversityTianjin 300350P.R.China Engineering Research Center of Thin Film Optoelectronics Technology Nankai UniversityTianjin 300350P.R.China

Most studies on device-free localization currently focus on single-person *** paper proposes a novel method for device-free localization that utilizes ZigBee received signal strength indication(RSSI)and a Transformer network *** method aims to address the limited research and low accuracy of two-person device-free *** paper first describes the construction of the sensor network used for collecting ZigBee *** then examines the format and features of ZigBee data *** algorithm design of this paper is then *** box plot method is used to identify abnormal data points,and a neural network is used to establish the mapping model between ZigBee RSSI matrix and localization *** neural network includes a Transformer encoder layer as the encoder and a fully connected network as the *** proposed method's classification accuracy was experimentally tested in an online test stage,resulting in an accuracy rate of 98.79%.In conclusion,the proposed two-person localization system is novel and has demonstrated high accuracy.

关键词： device-free localization deep learning ZigBee

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High-Precision Demodulation Method of MEMS Gyroscope Signal 3

High-Precision Demodulation Method of MEMS Gyroscope Signal

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3rd International Conference on sensing, Measurement and Data Analytics in the Era of Artificial Intelligence, ICSMD 2022

作者： Li, Jiawei Qin, Jun Sun, Xinyue Zhao, Ergang Yue, Zhao College of Electronic Information and Optical Engineering Nankai University Tianjin China College of Electronic Information and Optical Engineering Smart Sensing Interdisciplinary Science Center Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University Tianjin China

ISBN: (纸本)9781665492812

The output signal components of the sensitive end of micro-electro-mechanical system (MEMS) gyroscope are complex, and the design error of the back-end demodulation circuit can greatly affect the detection accuracy of the gyroscope. Therefore, this paper designs a high-precision signal demodulation scheme applicable to MEMS gyroscope sensors. The scheme improves the traditional signal demodulation technology by combining the correlation demodulation technology and the fast Fourier transform (FFT) technology, and after the correlation demodulation of the gyroscope-sensitive signal, the infinite impulse response (IIR) filter and the FFT transform are used to jointly extract the amplitude information of the fundamental frequency signal and do the fusion processing, so as to achieve the very high precision extraction of the input angular velocity. The feasibility of the demodulation scheme is verified by field programmable gate array (FPGA) simulation. The experimental results show that the combined IIR and FFT filtering algorithm has higher demodulation accuracy than the single low-pass finite impulse response (FIR) filtering algorithm. © 2022 IEEE.

关键词： digital low-pass filter fast Fourier transform MEMS gyroscope switch demodulation

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Miniature Fiber-optic Modal Interferometer Based on Ultrasonic-Cutting Technique for Low-range Refractive Index sensing 19

Miniature Fiber-optic Modal Interferometer Based on Ultrason...

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19th International Conference on Optical Communications and networks, ICOCN 2021

作者： Wang, Qian Wu, Jixuan Song, Binbin Bai, Hua Liu, Bo Duan, Shaoxiang Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems School of Electrical and Electronic Engineering Tiangong University Tianjin300387 China Key Laboratory of Computer Vision and Systems Ministry of Education School of Computer Science and Engineering Tianjin University of Technology Tianjin300384 China Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China

A fiber-optic modal interferometer is proposed and experimentally investigated for low-range refractive index sensing. This interferometer is fabricated by ultrasonic-cutting technique with a sensitivity of 12085.1 nm... 详细信息

ISBN: (纸本)9781665424462

关键词： Refractive index

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Motion artifact correction for MR images based on convolutional neural network

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optoelectronics Letters 2022年第1期18卷 54-58页

作者： ZHAO Bin LIU Zhiyang DING Shuxue LIU Guohua CAO Chen WU Hong College of Electronic Information and Optical Engineering Nankai UniversityTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai UniversityTianjin 300350China School of Artificial Intelligence Guilin University of Electronic TechnologyGuilin 541004China Department of Medical Imaging Tianjin Huanhu HospitalTianjin 300350China

Magnetic resonance imaging(MRI)is a common way to diagnose related ***,the magnetic resonance(MR)images are easily defected by motion artifacts in their acquisition process,which affects the clinicians’*** order to correct the motion artifacts of MR images,we propose a convolutional neural network(CNN)-based method to solve the *** method achieves a mean peak signal-to-noise ratio(PSNR)of(35.212±3.321)dB and a mean structural similarity(SSIM)of 0.974±0.015 on the test set,which are better than those of the comparison methods.

关键词： neural methods. problem.

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A Novel FPGA-Based Delay-Line Implementation and Interpolation Method Using TDCs

A Novel FPGA-Based Delay-Line Implementation and Interpolati...

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2023 International Conference on sensing, Measurement and Data Analytics in the Era of Artificial Intelligence, ICSMD 2023

作者： Sun, Xinyue Shi, Yuchen Li, Jiawei Ren, Yichen Zhao, Ergang Yue, Zhao College of Electronic Information and Optical Engineering Nankai University Tianjin China College of Electronic Information and Optical Engineering Smart Sensing Interdisciplinary Science Center of Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University Tianjin China

ISBN: (纸本)9798350318012

Precision time digital converter (i.e., TDC) is a crucial technique for sensing and detecting and is frequently employed in a variety of contexts, including inertial navigation, aviation, space physics, and optical fiber communication. However, the implementation of a stable and uniform delay line and the accurate time interpolation are frequent trouble in the implementation process but are hardly ever analyzed as a whole. In order to develop a full and exact system, this manuscript examines the two primary issues and offers practical solutions. The system is tested in the low-cost FPGA of the Altera Cyclone IV series. According to the test results, the precision TDC system performs admirably, with an RMS accuracy of approximately 18.54 ps. © 2023 IEEE.

关键词： Field programmable gate arrays (FPGA)

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0.35%THz pulse conversion efficiency achieved by Ti:sapphire femtosecond laser filamentation in argon at 1 kHz repetition rate

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Opto-Electronic Advances 2022年第9期5卷 26-33页

作者： Zhiqiang Yu Nan Zhang Jianxin Wang Zijie Dai Cheng Gong Lie Lin Lanjun Guo Weiwei Liu Institute of Modern Optics Nankai UniversityTianjin 300350China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

In this study,an optical setup for generating terahertz(THz)pulses through a two-color femtosecond laser filament was carefully designed to achieve a precise overlap of two-color laser pulses in space and time.β-barium borate(BBO),α-BBO,and a dual-wavelength plate were used to compensate the phase delay of the two-color *** ofα-BBO could further realize the precise spatial overlap of the two beams by counteracting the walk-off *** maximum out-put THz pulse energy reached 21μJ in argon gas when using a commercial Ti:sapphire laser with a pulse energy of 6 mJ at a 1 kHz repetition *** corresponding conversion efficiency exceeded 0.35%.

关键词： femtosecond laser filaments walk-off effect conversion efficiency

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Reverse Attention U-Net for Brain Grey Matter Nuclei Segmentation 1

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3rd International Conference on Artificial Intelligence, 2022

作者： Wu, Mengran Zhao, Bin Chai, Chao Liu, Guohua Liu, Zhiyang Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China School of Medicine Tianjin First Central Hospital Nankai University Tianjin300192 China

ISBN: (数字)9789811694233

ISBN: (纸本)9789811694226

It has been reported that abnormal high iron deposition in brain grey matter nuclei is closely related to neurodegenerative diseases. Therefore, precise nuclei segmentation is beneficial to further explore the pathological mechanism of neurodegenerative diseases. However, segmenting nuclei manually is an extremely time-consuming work. To this end, we proposed a Reverse Attention U-Net (RAU-Net) for segmenting nuclei automatically, where multiple reverse attention (RA) modules are added between the encoder and decoder to aggregate different features. In the meanwhile, we use the estimations of segmentation maps at multiple levels as the guide information for the RA module. The model with RA module implicitly erases the predicted nuclei regions while highlighting background, which guides the network to explore the missing nuclei parts sequentially. Experimental results on our nuclei dataset imply that the RAU-Net performs favorably against the state-of-the-art methods. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Neurodegenerative diseases

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Research on access solution of communication network for smart home energy monitoring system 9

Research on access solution of communication network for sma...

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9th China International Conference on Electricity Distribution, CICED 2021

作者： Liu, Jin Feng, Yingmin Huang, Liyan Ren, Guoqi Zhao, Jing Zhang, Hui Economic and Technology Research Institue Planning and Review Cener State Grid Tianjin Electric Power Tianjin China Nankai University Tianjin Key Lab. of Optoelectronic Sensor and Sensing Network Technology Tianjin China

ISBN: (纸本)9781728192291

This paper describes the communication technology used in the smart home energy monitoring system from two aspects. On the one hand, users can realize two-way interaction of electricity through the company communication network;On the other hand, the real-time monitoring of smart home can be realized through the telecom operator network and the home domain ZigBee network. This paper focuses on the technical characteristics of ZigBee and networking application of Internet of things in home domain. © 2021 IEEE.

关键词： Internet of things

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