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A Rapid Adaptation Approach for Dynamic Air‑Writing Recognition Using Wearable Wristbands with Self‑Supervised Contrastive Learning

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Nano-Micro Letters 2025年第2期17卷 417-431页

作者： Yunjian Guo Kunpeng Li Wei Yue Nam‑Young Kim Yang Li Guozhen Shen Jong‑Chul Lee Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897South Korea Radio Frequency integrated Circuit(RFIC)Bio Centre Kwangwoon UniversitySeoul 01897South Korea Department of Electronic Engineering Kwangwoon UniversitySeoul 01897South Korea School of Microelectronics Shandong UniversityJinan 250101People’s Republic of China State key laboratory of integrated Chips and Systems Fudan UniversityShanghai 200433People’s Republic of China School of integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081People’s Republic of China

Wearable wristband systems leverage deep learning to revolutionize hand gesture recognition in daily *** existing approaches that often focus on static gestures and require extensive labeled data,the proposed wearable wristband with selfsupervised contrastive learning excels at dynamic motion tracking and adapts rapidly across multiple *** features a four-channel sensing array composed of an ionic hydrogel with hierarchical microcone structures and ultrathin flexible electrodes,resulting in high-sensitivity capacitance *** wireless transmission from a Wi-Fi module,the proposed algorithm learns latent features from the unlabeled signals of random wrist ***,only few-shot labeled data are sufficient for fine-tuning the model,enabling rapid adaptation to various *** system achieves a high accuracy of 94.9%in different scenarios,including the prediction of eight-direction commands,and air-writing of all numbers and *** proposed method facilitates smooth transitions between multiple tasks without the need for modifying the structure or undergoing extensive task-specific *** utility has been further extended to enhance human–machine interaction over digital platforms,such as game controls,calculators,and three-language login systems,offering users a natural and intuitive way of communication.

关键词： Wearable wristband Self-supervised contrastive learning Dynamic gesture Air-writing Human-machine interaction

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Linear shallow neural network to accelerate transmitter dispersion eye closure quaternary(TDECQ) assessment

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Science China(Information Sciences) 2024年第4期67卷 337-338页

作者： Junjiang XIANG Zejun CHEN Yijun CHENG Hailin YANG Xuancheng HUO Meng XIANG Gai ZHOU Yuwen QIN Songnian FU Institute of Advanced photonics technology School of Information EngineeringGuangdong University of Technology School of Optical and Electronic Information Huazhong University of Science and Technology key laboratory of photonic technology for integrated sensing and communication Ministry of Education of ChinaGuangdong University of Technology Guangdong Provincial key laboratory of Information photonics technology Guangdong University of Technology

To support the ever-emerging capacity requirement of datacenter interconnection(DCI) applications, transmitter dispersion eye closure quaternary(TDECQ) has been proposed by IEEE802.3 standard [1], which is specifically employed for the four-level pulse amplitude modulation(PAM-4) signals. However, the traditional scheme of TDECQ assessment needs several iterative operations,

关键词： IEEE Standards

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Gastroscopy-conjugated photoacoustic and ultrasonic dual-mode imaging for detection of submucosal gastric cancer:in vitro study

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Chinese Physics B 2020年第6期29卷 185-190页

作者： Huaqin Wu Haiyang Song Yudian Huang Zhifang Li Shulian Wu Xiaoman Zhang Hui Li College of photonic and Electronic Engineering Fujian Normal UniversityFujian Provincial Engineering Research Center for OptoElectronic Sensing TechnologyFujian Provincial Key Laboratory of Photonic TechnologyKey Laboratory of Optoelectronic Science and Technology for MedicineMinistry of EducationFuzhou 350007China Department of Pathology Fuzhou First Hospital Affiliated to Fujian Medical UniversityFuzhou 350009China

This paper presents photoacoustic and ultrasonic dual-mode imaging for real-time detection of submucosal gastric cancer with a combination of *** diagnostic capacity was directly addressed via several phantoms and ex vivo *** demonstrated that superficial and submucosal gastric cancer can be diagnosed with a perceptible depth of 6.33 mm,a lateral accuracy of 2.23 mm,and a longitudinal accuracy of 0.17 mm though capturing the morphology of angiogenesis,which is a main character of the therioma-related *** capability of gastroscopy-conjugated photoacoustic and ultrasonic dual-mode imaging system will own great potential in improving the clinical diagnostic rate of submucosal gastric cancer.

关键词： photoacoustic imaging intracavity pulsed laser irradiation extra abdominal receiving photoacoustic signal submucosal gastric cancer

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A real-time performance improvement method for composite time scale

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Chinese Physics B 2024年第9期33卷 350-357页

作者： Fangmin Wang Wenlin Li Hongfei Dai Chunyi Li Jianhua Zhou Shenhui Xue Bo Wang State key laboratory of Precision Space–time Information sensing technology Department of Precision InstrumentTsinghua UniversityBeijing 100084China key laboratory of photonic Control technology(Tsinghua University) Ministry of EducationBeijing 100084China Beijing Satellite Navigation Center Beijing 100094China

The composite time scale(CTS)provides a stable,accurate,and reliable time scale for modern *** improvement of CTS’s real-time performance will improve its stability,which strengths related applications’*** at this goal,a method achieved by determining the optimal calculation interval and accelerating adjustment stage is proposed in this *** determinants of the CTS’s calculation interval(characteristics of the clock ensemble,the measurement noise,the time and frequency synchronization system’s noise and the auxiliary output generator noise floor)are studied and the optimal calculation interval is *** also investigate the effect of ensemble algorithm’s initial parameters on the CTS’s adjustment stage.A strategy to get the reasonable initial parameters of ensemble algorithm is *** results show that the adjustment stage can be finished rapidly or even can be shorten to zero with reasonable initial *** this basis,we experimentally generate a distributed CTS with a calculation interval of 500 s and its stability outperforms those of the member clocks when the averaging time is longer than1700 *** experimental result proves that the CTS’s real-time performance is significantly improved.

关键词： composite time scale real-time performance calculation interval adjustment stage

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The Absorbing Properties of Two-Dimensional Plasma photonic Crystals

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Plasma Science and technology 2015年第1期17卷 4-9页

作者：亓丽梅李超方广有高翔 key laboratory of Electromagnetic Radiation and sensing technology Institute of ElectronicsChinese Academy of Sciences

Plasma photonic crystals composed of periodic plasma and dielectric materials have attracted considerable attention because of their tunable photonic band gaps,but only their band structures or negative refractive index properties have been addressed in previous *** this paper,through studying the transmission and reflection characteristics of two types of twodimensional plasma photonic crystals,it is found that plasma photonic crystals play an important role in absorbing waves,and they show broader band and higher amplitude absorption characteristics than bulk ***,the absorption of plasma photonic crystals can be tuned via plasma parameters;varying the collision frequency can make the bandwidth and amplitude tunable,but cannot change the central frequency,whereas varying the plasma frequency would control both the location and the amplitude of the *** features of plasma photonic crystals have potential for terahertz tunable absorber applications.

关键词： plasma photonic crystal absorber tunable plasma frequency collision frequency

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Differential mode-gain equalization via femtosecond laser micromachining-induced refractive index tailoring

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Light(Advanced Manufacturing) 2024年第2期5卷 24-32页

作者： Cong Zhang Senyu Zhang Yan Zeng Yue Wang Meng Xiang Di Lin Songnian Fu Yuwen Qin Institute of Advanced photonics technology School of Information EngineeringGuangdong University of TechnologyGuangzhou510006China key laboratory of photonic technology for integrated sensing and communication Ministry of Education of ChinaGuangdong University of TechnologyGuangzhou510006China Guangdong Provincial key laboratory of Information photonic technology Guangdong University of TechnologyGuangzhou 510006China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China

The mode-division multiplexing technique combined with a few-mode erbium-doped fiber amplifier(FM-EDFA)demonstrates significant potential for solving the capacity limitation of standard single-mode fiber(SSMF)transmission ***,the differential mode gain(DMG)arising in the FM-EDFA fundamentally limits its transmission capacity and ***,an innovative DMG equalization strategy using femtosecond laser micromachining to adjust the refractive index(RI)is *** mode-dependent attenuations can be achieved according to the DMG profile of the FM-EDFA,enabling DMG *** validate the proposed strategy,DMG equalization of the commonly used FM-EDFA configuration was *** results revealed that by optimizing both the length and RI modulation depth of the femtosecond laser-tailoring area,the maximum DMG(DMGmax)among the 3 linear-polarized(LP)mode-group was mitigated from 10 dB to 1.52 dB,whereas the average DMG(DMGave)over the C-band was reduced from 8.95 dB to 0.78 ***,a 2-LP mode-group DMG equalizer was experimentally demonstrated,resulting in a reduction of the DMGmax from 2.09 dB to 0.46 dB,and a reduction of DMGave over the C band from 1.64 dB to 0.26 dB,with only a 1.8 dB insertion ***,a maximum range of variable DMG equalization was achieved with 5.4 dB,satisfying the requirements of the most commonly used 2-LP mode-group amplification scenarios.

关键词： Mode-division multiplexing Few-mode Erbium-doped fiber amplifier Differential mode gain Femtosecond laser micromachining

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A measurement of epidermal thickness of fingertip skin from OCT images using convolutional neural network

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Journal of Innovative Optical Health Sciences 2021年第1期4卷 56-62页

作者： Yongping Lin Dezi Li Wang Liu Zhaowei Zhong Zhifang Li Youwu He Shulian Wu Fujian Provincial key laboratory of Optoelectronic technology and Devices School of Optoelectronic and communication Engineering Xiamen University of technology Xiamen 361024P.R.China key laboratory of Optoelectronic Science and technology for Medicine Ministry of Education Fujian Provincial Key Laboratory of Photonics Technology Fujian Provincial Engineering Technology Research Center of Photoelectric Sensing Application College of Photonic and Electronic Engineering Fujian Normal UniversityFuzhouFujian 350007P.R.China

In this study,we proposed a method to measure the epidermal thickness(ET)of skin based on deep convolutional neural network,which was used to determine the boundaries of skin surface and the ridge portion in dermal-epidermis junction(DE J)in cross-section optical coherence tomography(OCT)images of fingertip *** ET was calculated based on the row difference between the surface and the ridge top,which is determined by search the local maxima of boundary of the ridge *** results demonstrated that the region of ridge portion in DEJ was well determined and the ET measurement in this work can reduce the effect of the papillae valley in DEJ by 9.85%.It can be used for quantitative characterization of skin to differentiate the skin diseases.

关键词： Epidermal thickness cross-section OCT images convolutional neural network

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Hybrid quantum private communication with continuous-variable and discrete-variable signals

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Science China(Physics,Mechanics & Astronomy) 2015年第2期58卷 14-20页

作者： LIU WeiQi PENG JinYe WANG Chao CAO ZhengWen HUANG Duan LIN DaKai HUANG Peng ZENG GuiHua College of Information Science and technology Northwest University State key laboratory of Advanced Optical communication Systems and Networks and Center of Quantum Information Sensing and ProcessingShanghai Jiaotong University

The quantum key distribution(QKD) has been entering the practical application era. Subsequently, hybrid quantum private communication with discrete-variable signals, continuous-variable signals, and classic optical signals becomes inevitable in the practical scenario. In this paper, we experimentally investigated the mutual effects between the discrete-variable QKD(DVQKD) and the continuous-variable QKD(CVQKD) via a fiber channel. The experimental results show that the DVQKD will be influenced by the continuous-variable quantum signals and classic optical signals, while the CVQKD is not sensitive to the discrete-variable quantum signals.

关键词： hybrid quantum private communication Gaussian-modulated CVQKD protocol BB84 protocol mutual influences

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Enhancement of magnetic and dielectric properties of low temperature sintered NiCuZn ferrite by Bi_(2)O_(3)-CuO additives

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Chinese Physics B 2022年第4期31卷 660-666页

作者： Jie Li Bing Lu Ying Zhang Jian Wu Yan Yang Xue-Ning Han Dan-Dan Wen Zheng Liang Huai-Wu Zhang State key laboratory of Electronic Thin Film and integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China College of communication Engineering Chengdu University of Information TechnologyChengdu 610225China Chongqing Engineering Research Center of Intelligent sensing technology and Microsystem Chongqing University of Post and TelecommunicationsChongqing 400065China

With a series of 1.0 wt%Bi_(2)O_(3)-x wt%CuO(x=0.0,0.2,0.4,0.6,and 0.8)serving as sintering additives,Ni_(0.23)Cu_(0.32)Zn_(0.45)Ee_(2)O_(4)ferrites are successfully synthesized at a low temperature(900℃)by using the solid state reaction *** effects of the additives on the phase formation,magnetic and dielectric properties as well as the structural and gyromagnetic properties are *** x-ray diffraction(XRD)results indicate that the added Bi_(2)O_(3)-CuO can lower the synthesis temperature significantly without the appearing of the second *** scanning electron microscope(SEM)images confirm that Bi_(2)O_(3)is an important factor that determines the sintering behaviors,while CuO affects the grain size and *** CuO content x=0.4 or 0.6,the sample shows high saturation magnetization,low coercivity,high real part of magnetic permeability,dielectric permittivity,and small ferromagnetic resonance linewidth(ΔH).The NiCuZn ferrites are a promising new generation of high-performance microwave devices,such as phase shifters and isolators.

关键词： NiCuZn ferrite Bi_(2)O_(3)-CuO additive magnetic properties dielectric properties ferromagnetic resonance(FMR)linewidth

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High-Resolution Plasmonic Refractive-Index Sensor Based on a Metal-Insulator-Metal Structure

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Chinese Physics Letters 2011年第5期28卷 120-123页

作者： ZHU Jia-Hu HUANG Xu-Guang MEI Xian key laboratory of photonic Information technology of Guangdong Higher Education Institutes South China Normal UniversityGuangzhou 510006

A high-resolution plasmonic refractive-index sensor based on a metal-insulator-metal structure consisting of a straight bus waveguide and a resonator waveguide is proposed and numerically simulated by using the finite difference time domain method under a perfectly matched layer absorbing boundary *** analytic and simulated results show that the resonant wavelengths of the sensor have a linear relationship with the refractive index of material under *** on the relationship,the refractive index of the material can be obtained from the detection of one of the resonant *** resolution of refractive index of the nanometeric plasmonic sensor can reach as high as 10-6,giving the wavelength resolution of 0.01 *** could be applied to highly-resolution biological sensing.

关键词： waveguide resonator refractive

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