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A Double-Compensation-Based Federated Learning Scheme for Data Privacy Protection in a Social IoT Scenario

Computers, Materials & Continua 2023年第7期76卷 827-848页

作者： junqi guo Qingyun Xiong Minghui Yang Ziyun Zhao School of Artificial Intelligence Beijing Normal UniversityBeijing100875China Engineering Research Center of Intelligent Technology and Educational Application Ministry of EducationBeijing100875China

Nowadays,smart wearable devices are used widely in the Social Internet of Things(IoT),which record human physiological data in real *** protect the data privacy of smart devices,researchers pay more attention to federated *** the data leakage problem is somewhat solved,a new challenge has *** federated learning shortens the convergence time,while it has time delay and data heterogeneity *** of the two problems harm the *** overcome these issues,we propose an asynchronous federated learning scheme based on double compensation to solve the problem of time delay and data heterogeneity *** scheme improves the Delay Compensated Asynchronous Stochastic Gradient Descent(DC-ASGD)algorithm based on the second-order Taylor expansion as the delay *** adds the FedProx operator to the objective function as the heterogeneity ***,the proposed scheme motivates the federated learning process by adjusting the importance of the participants and the central *** conduct multiple sets of experiments in both conventional and heterogeneous *** experimental results show that our scheme improves the accuracy by about 5%while keeping the complexity *** can find that our scheme converges more smoothly during training and adapts better in heterogeneous environments through numerical *** proposed double-compensation-based federated learning scheme is highly accurate,flexible in terms of participants and smooth the training *** it is deemed suitable for data privacy protection of smart wearable devices.

关键词： Social Internet of Things smart wearable devices data privacy asynchronous federated learning

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Research on the balance optimization algorithm of image recognition accuracy and speed based on autocollimator measurement

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Optoelectronics Letters 2025年第2期 121-128页

作者： LI Renpu MA Long CUI Jiwen guo junqi Andrei KULIKOV WEN Dandan Chongqing Engineering Research Center of Intelligent Sensing Technology and Microsystem Chongqing University of Post and Telecommunications School of Instrumentation Science and Engineering Harbin Institute of Technology Higher School of Engineering and Technology ITMO University

The autocollimator is an important device for achieving precise,small-angle,non-contact *** primarily obtains angular parameters of a plane target mirror indirectly by detecting the position of the imaging *** is limited report on the core algorithmic techniques in current commercial products and recent scientific *** paper addresses the performance requirements of coordinate reading accuracy and operational speed in autocollimator image *** proposes a cross-image center recognition scheme based on the Hough transform and another based on Zernike moments and the least squares *** experimental evaluation of the accuracy and speed of both schemes,the optimal image recognition scheme balancing measurement accuracy and speed for the autocollimator is *** these,the center recognition method based on Zernike moments and the least squares method offers higher measurement accuracy and stability,while the Hough transform-based method provides faster measurement speed.

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A PILOT-ASSISTED NON-CYCLIC PREFIXED MIMO-SCFDE SYSTEM

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Journal of Electronics(China) 2009年第4期26卷 479-486页

作者： Ren Shubo guo junqi Xiang Haige Satellite and Wireless Communication Lab Peking University Beijing 100871 China

A non-Cyclic Prefixed Multiple-Input Multiple-Output Single-Carrier Frequency-Domain Equalization (non-CP MIMO-SCFDE) system based on a recursive algorithm of Joint Channel Es- timation and Data Detection (recursive-JCEDD) is proposed in this paper. Unlike the traditional CP MIMO-SCFDE system, the transmitted block of the proposed system is designed in the way that block-type pilot sequences and Single-Carrier (SC) information sequences have been arranged alter- nately without any cyclic prefix before each SC information sequence. Moreover, a recursive-JCEDD algorithm based on interference cancellation is proposed for the corresponding receivers. Simulation results show that the Bit Error Rate (BER) of the proposed system based on the recursive-JCEDD algorithm is lower than traditional CP MIMO-SCFDE or MIMO-OFDM with channel estimation for more than 0.5 dB.

关键词： Non-Cyclic Prefixed Multiple-Input Multiple-Output Single-Carrier Frequency-Domain Equalization (non-CP MIMO-SCFDE) Recursive algorithm of Joint Channel Estimation and Data Detection (recursive-JCEDD) Interference cancellation

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Novel On-Line North-Seeking Method Based on a Three-Axis MEMS Gyroscope

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Journal of Beijing Institute of Technology 2018年第4期27卷 623-629页

作者： Yu Liu Gaojun Xiang junqi guo Min Zhou and Hongzhi Liu Chongqing Municipal Level Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology Chongqing University of Post and TelecommunicationsChongqing 400065China

A novel on-line north-seeking method based on a three-axis micro-electro-mechanical system(MEMS)gyroscope is *** system processes data by using a Kalman filter to calibrate the installation error of the three-axis MEMS gyroscope in complex *** attitude angle updating for quaternion,based on which the attitude instrument will be rotated in real-time and the true north will be *** experimental platform constitutes the dual-axis electric rotary table and the attitude instrument,which is developed independently by our scientific research *** experimental results show that the accuracy of north-seeking is higher than 1°,while the maximum root mean square error and the maximum mean absolute error are 0.906 7 and 0.910 0,*** accuracy of north-seeking is much higher than the traditional method.

关键词： micro-electro-mechanical system(MEMS)gyroscope quaternion rotating system in realtime north-seeking

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Phase-sensitive manipulation of squeezed state by a degenerate optical parametric amplifier inside coupled optical resonators

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Optoelectronics Letters 2022年第3期18卷 135-142页

作者： DI Ke WANG Wenbo CUI Wei guo junqi LIU Yu DU Jiajia Chongqing Engineering Research Center of Intelligent Sensing Technology and Microsystem Chongqing University of Post and TelecommunicationsChongqing 400065China

In this paper, we investigate the quantum fluctuations of subharmonic reflected field from a triple-resonant degenerate optical parametric amplifier(OPA) inside coupled optical resonators, which is driven by the squeezed beam at signal frequency. By controlling the relative phase between the pump beam and the injected signal beam, we can see the quantum fluctuation in the phase direction and amplitude direction due to the parametric down-conversion process in the cavity. Thus, the phase sensitive operation of the compression field is realized due to the quantum interference between the harmonic field of the down converter of OPA and the inner field of the coupled optical resonator. We verified the quantum coherent phenomena of OPA in coupled optical resonators and phase-sensitive manipulations of quantum entanglement for quantum information processing. We realized the electromagnetically induced transparency-like(EIT-like) effect and the optical parameter conversion process at the same time in one optical device. These properties can favor higher manipulation precision and control efficiency, which is more suitable for the integration of quantum-on-chip systems, laying a foundation for the practical application of quantum information.

关键词： quantum parametric degenerate

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Landslide hazard susceptibility evaluation based on SBAS-InSAR technology and SSA-BP neural network algorithm:A case study of Baihetan Reservoir Area

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Journal of Mountain Science 2024年第3期21卷 952-972页

作者： guo junqi XI Wenfei YANG Zhiquan SHI Zhengtao HUANG Guangcai YANG Zhengrong YANG Dongqing Faculty of Geography Yunnan Normal UniversityKunming 650500China Key Laboratory of Early Rapid Identification Prevention and Control of Geological Diseases in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan ProvinceKunming 650093China Faculty of Public Safety and Emergency Management Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Geological Disaster Risk Prevention and Control and Emergency Disaster Reduction of Ministry of Emergency Management of the People’s Republic of China Kunming University of Science and TechnologyKunming 650093China Guizhou Geological Survey Institute Guiyang 550081China College of Big Data and Intelligent Engineering Southwest Forestry UniversityKunming 650224China

Landslide hazard susceptibility evaluation takes on critical significance in early warning and disaster prevention and *** order to solve the problems of poor effectiveness of landslide data and complex calculation of weights for multiple evaluation factors in the existing landslide susceptibility evaluation models,in this study,a method of landslide hazard susceptibility evaluation is proposed by combining SBAS-InSAR(Small Baseline Subsets-Interferometric Synthetic Aperture Radar)and SSA-BP(Sparrow Search Algorithm-Back Propagation)neural network *** SBAS-InSAR technology is adopted to identify potential landslide hazards in the study area,update the cataloging data of landslide hazards,and 11 evaluation factors are chosen for constructing the SSA-BP model for training and *** Reservoir area is selected as a case study for *** indicated by the results,the application of SBAS-InSAR technology,combined with both ascending and descending orbit data,effectively addresses the incomplete identification of landslide hazards caused by geometric distortion of single orbit SAR data(e.g.,shadow,overlay,and perspective contraction)in deep canyon areas,thereby enabling the acquisition of up-to-date landslide hazard ***,in comparison to the conventional BP(Back Propagation)algorithm,the accuracy of the model constructed by the SSA-BP algorithm exhibits a significant increase,with mean squared error and mean absolute error reduced by 0.0142 and 0.0607,***,during the process of susceptibility evaluation,the SSA-BP model effectively circumvents the issue of considerable manual interventions in calculating the weight of evaluation *** area under the curve of this model reaches 0.909,surpassing BP(0.835),random forest(0.792),and the information value method(0.699).The risk of landslide occurrence in the Baihetan Reservoir area is positively correlated with slope,surface temperature,and deformation ra

关键词： Baihetan SBAS-InSAR SSA-BP Landslide hazard susceptibility evaluation

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A biological fluid fiber Sagnac sensor based on SPF-PCF-SPF structure

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Optoelectronics Letters 2023年第4期19卷 210-214页

作者： guo junqi WANG Changle DI Ke LI Zhehao LI Renpu LIU Yu Chongqing Key Laboratory of Autonomous Navigation and Microsystem Chongqing University of Post and TelecommunicationsChongqing 400065China Chongqing Engineering Research Center of Intelligent Sensing Technology and Microsystem Chongqing University of Posts and TelecommunicationsChongqing 400065China

A biological solution concentration sensor based on a side-polished fiber(SPF)assisted fluid system is *** birefringence properties of the asymmetrically filled fluid in this structure and the relationship between the concentration of the biological solution and the refractive index are theoretically *** was found that the interference peaks had red-shifted with increasing concentration.A sensing sensitivity of 1.3871×10^(4)nm·mL/mol at 14.68×10^(-4)mol/mL was achieved within the experimental range after different concentrations of arginine solutions were injected into the sensing *** sensing system can also be applied to measure the concentration of other biological solutions,providing the feasibility of real-time detection of biological solutions.

关键词： fiber fluid structure

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Design and numerical simulation of SPF-PCF-SPF fluid sensing system based on photoelectric oscillator

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Optoelectronics Letters 2022年第6期18卷 326-330页

作者： guo junqi YUE Yiting CUI Wei ZOU Xinhai YANG Haoyu YANG Junkai Chongqing Engineering Research Center of Intelligent Sensing Technology and Microsystem Chongqing University of Post and TelecommunicationsChongqing 400065China

In this paper,an optical fiber fluid sensing system based on optoelectronic oscillator(OEO)was proposed and studied *** fluid sensor head is constructed by splicing two sections of side-polished fiber(SPF)to one section of photonic crystal fiber(PCF).Fluid sample can flow continuously through the holes of *** refractive index(RI)change of the fluid sample can lead to the effective RI change of the fiber,resulting in frequency change of microwave signal generated by *** monitoring the oscillation frequency using an electronic spectrum analyzer(ESA),the RI of fluid sample can be *** to the fast interrogation speed of ESAs,the measuring speed can be increased significantly compared to traditional optical fiber RI sensing systems using optical *** sensing principle of the system was *** sensitivity of the proposed system was evaluated by simulation,and an RI sensitivity of-14.20 MHz/RIU can be *** results show that with proper system design,real-time RI measurement with high sensitivity can be *** the length of the PCF while under the premise of the fluid parameters will be the most reasonable way to improve the *** proposed design and simulation results can provide suggestions for the fabrication and optimization of fluid sensing systems used for real-time detection and measurement of biological elements and heavy metal ions in liquid environment.

关键词： fiber oscillator system

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Simulation and experimental verification of off-axis fiber Bragg grating bending sensor with high refractive index modulation

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Optoelectronics Letters 2022年第4期18卷 200-203页

作者： CUI Wei ZHOU Yanfang YAN Zhonghua guo junqi YUE Yiting CHEN Hao Chongqing Engineering Research Center of Intelligent Sensing Technology and Microsystem Chongqing University of Post and TelecommunicationsChongqing 400065China

Off-axis FBG simulations were performed in this paper using a finite element method in conjunction with the conformal mapping technique to study the bending sensing characteristics of the off-axis FBG with high index *** refractive index(RI)increase of the grating region is taken into consideration for the mode field *** influences of high RI increase and the offset distance of the grating on the bending sensitivity were ***-axis FBGs with different offset distances were fabricated using femtosecond laser with phase mask technique in standard single-mode *** simulation results were verified by the experiment.A bending sensitivity of 0.055 d B/m^(-1) was achieved with an offset distance of 4μ*** simulation and experiment results suggest that the grating offset distance has a greater influence on the sensitivity of the off-axis FBG with high RI modulation than that with low RI *** proposed sensor structure and simulation results can provide suggestion for the design and processing of off-axis FBG bending sensors.

关键词： fiber bending offset

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Research on a fiber sensing system for metal ion detection based on SPF-PCF-SPF structure and coated LPFG

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Optoelectronics Letters 2024年第4期20卷 211-215页

作者： guo junqi ZHOU Yanfang ZHENG Wenyue XU Qianwen LIU Yu LI Renpu Chongqing Key Laboratory of Autonomous Navigation and Microsystem Chongqing University of Post and TelecommunicationsChongqing 400065China Chongqing Engineering Research Center of Intelligent Sensing Technology and Microsystem Chongqing University of Posts and TelecommunicationsChongqing 400065China

In order to provide a method for accurately detecting the concentration and types of heavy metal ions in water,a fluid ion detection system is *** consists of a side-polished fiber-assisted fluid structure and a long-period fiber grating(LPFG)coated with a metal chelating agent *** this study,both theoretical and experimental investigations are conducted to examine the sensing characteristics of the system towards copper ion and iron ion *** results demonstrate that under the premise of ensuring solution flow,the system can achieve specific identification of different types of heavy metal ***,it exhibits concentration sensing sensitivities of 9.23×10^(4) mL·nm/mol and 7.13×10^(4) mL·nm/mol for copper sulfate(CuSO_(4))and ferric chloride(FeCl_(3))solutions,***,this sensing system offers the potential for real-time detection of metal ions.

关键词： system fiber structure

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