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Noninvasive in vivo study of NADH fluorescence and its real-time intrinsic dynamical changes: Experiments and seven-layered skin model Monte Carlo simulations

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Journal of Innovative optical Health Sciences 2022年第3期15卷 10-22页

作者： Huayi Hou Gongzhi Du Yuancheng Wang Chunping Su Lianbo Guo Xiangbai Chen Hubei Key Laboratory of Optical Information and Pattern Recognition and School of Chemistry and Environmental Engineering Wuhan Institute of Technology WuhanHubei 430205P.R.China Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology Wuhan Hubei 430074P.R.China

Reduced nicotinamide adenine dinucleotide(NADH)plays a crucial role in many biochemical reactions in human *** this work,a flow-mediated skin fluorescence(FMSF)-postocclusion reactive hyperaemia(PORH)system was developed for noninvasive and in vivo measurement of NADH fluorescence and its real-time dynamical changes in human skin *** real-time dynamical changes of NADH fluorescence were analyzed with the changes of skin blood flow measured by laser speckle contrast imaging(LSCI)experiments simultaneously with FMSFPORH measurements,which suggests that the dynamical changes of NADH fluorescence would be mainly correlated with the intrinsic changes of NADH level in the skin *** addition,Monte Carlo simulations were applied to understand the impact of optical property changes on the dynamical changes of NADH fluorescence during the PORH process,which further supports that the dynamical changes of NADH fluorescence measured in our system would be intrinsic changes of NADH level in the skin tissue.

关键词： Reduced nicotinamide adenine dinucleotide(NADH) fluorescence laser speckle contrast imaging(LSCI) Monte Carlo simulation dynamical change

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A study on soft x-ray spectra from pulsed 1 μm Nd:YAG laser-induced ytterbium plasmas

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Plasma Science and Technology 2020年第10期22卷 119-125页

作者： Tao WU Jun HE Li YANG Peixiang LU Hubei Key Laboratory Optical Information and Pattern Recognition School of Optical Information and Energy EngineeringWuhan Institute of TechnologyWuhan 430205People's Republic of China Guangdong Intelligent Robotics Institute Dongguan 523808People's Republic of China

The Nd:YAG laser with a wavelength of 1.064 μm was used to generate plasmas on a high-purity solid ytterbium(70 Yb) target in a vacuum chamber. The soft x-ray time-and space-integration spectra from the Yb plasmas were measured in the wavelength range of 1.0–8.5 nm under different power densities. The atomic spectral data of the unresolved transition arrays from highly charged Yb ions were calculated based on Cowan's suite of codes, including configuration interaction. The calculated Gaussian envelope of the emission determined by the weighted spontaneous transition rates was compared with the experimental spectra, and a good agreement between them was obtained. The spatial-temporal evolutions of the plasmas under the experimental conditions are simulated based on the collisional-radiative model, enabling the understanding of the mechanism of the plasma conditions for optimal water window waveband emission output.

关键词： laser produced plasma water window sources unresolved transition arrays ytterbium

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Epitaxial growth of 2D gallium selenide flakes for strong nonlinear optical response and visible-light photodetection

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Frontiers of physics 2023年第5期18卷 237-244页

作者： Mengting Song Nan An Yuke Zou Yue Zhang Wenjuan Huang Huayi Hou Xiangbai Chen Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

As an emerging groupⅢ–Ⅵsemiconductor two-dimensional(2D)material,gallium selenide(GaSe)has attracted much attention due to its excellent optical and electrical *** this work,high-quality epitaxial growth of few-layer GaSe nanoflakes with different thickness is achieved via chemical vapor deposition(CVD)*** to the non-centrosymmetric structure,the grown GaSe nanoflakes exhibits excellent second harmonic generation(SHG).In addition,the constructed GaSe nanoflake-based photodetector exhibits stable and fast response under visible light excitation,with a rise time of 6 ms and decay time of 10 *** achievements clearly demonstrate the possibility of using GaSe nanoflake in the applications of nonlinear optics and(opto)-electronics.

关键词： 2D materials gallium selenide second harmonic generation chemical vapor deposition photodetector

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DSP Fast Processing Technology Based on BP Algorithm 7

DSP Fast Processing Technology Based on BP Algorithm

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7th International Conference on information Science and Control Engineering, ICISCE 2020

作者： Meng, Fanchen Zhang, Tianxu Wuhan Institute of Technology Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan China Institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728164069

Image recognition has always been an important research topic in the field of pattern recognition. This article uses the printed character recognition of bills as the research background. Through the detailed analysis of the recognition process, some preprocessing algorithms are selected and implemented, including image enhancement, binarization, filtering, character cutting, skew correction, etc. Finally, transplant each algorithm to the simulation platform, mainly for BP algorithm, according to the characteristics of DSP, optimize from two aspects of compilation options and source code to meet the requirements of fast processing. Finally, the requirements of better recognition effect and fast processing speed are realized. © 2020 IEEE.

关键词： Image enhancement

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Bounding Box Repairing Algorithm for Underwater Object Detection Based on IoU Optimization 7

Bounding Box Repairing Algorithm for Underwater Object Detec...

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7th International Conference on information Science and Control Engineering, ICISCE 2020

作者： Chen, Bingchuan Ma, Lei Wu, Jinmeng Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan China School of Electrical and Information Engineering Wuhan Institute of Technology Wuhan China

ISBN: (纸本)9781728164069

In recent years, deep learning based methods have achieved excellent performance in standard object detection. However, these methods lack sufficient capabilities to handle underwater object detection due to these challenges: (1) underwater images have color shift and low contrast, and (2) various noises (sediments, bubbles, etc.) would cause blurring in underwater images. To address these problems, our work investigates optimization policies to detect low-contrast and blurred mine. We propose a bounding box repairing algorithm based on Intersection over Union (IoU) optimization. The algorithm mainly optimizes Mask Scoring R-CNN network. Firstly, we use the Mask Scoring R-CNN model to generate the coarse-grained detection results of mines. Secondly, we perform IoU between the coarse-grained boxes and the annotated boxes in the dataset to obtain the best matching area. Finally, we use the best matching area to repair the coarse-grained boxes. Experimental results show that our method achieves promising object detection and localization performance in underwater environment. © 2020 IEEE.

关键词： Deep learning

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MoS_(2)core-shell nanoparticles prepared through liquid-phase ablation and light exfoliation of femtosecond laser for chemical sensing

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Science China(Technological Sciences) 2023年第3期66卷 853-862页

作者： ZUO Pei JIANG Lan LI Xin TIAN MengYao YUAN YongJiu HAN WeiNa MA Le HU LiFei HE ZhiCong LI Fang School of Mechanical and Electrical Engineering Hubei Key Laboratory of Optical Information and Pattern RecognitionSchool of Optical Information and Energy EngineeringWuhan Institute of TechnologyWuhan 430073China Laser Micro/Nano Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

Molybdenum disulfide(MoS_(2))-based nanostructures are highly desirable for applications such as chemical and biological sensing,photo/electrochemical catalysis,and energy storage due to their unique physical and chemical *** this work,MoS_(2)core-shell nanoparticles were first prepared through the liquid-phase processing of bulk MoS2by a femtosecond *** core of prepared nanoparticles was incompletely and weakly crystalline MoS_(2);the shell of prepared nanoparticles was highly crystalline MoS_(2),which wrapped around the core layer by *** femtosecond laser simultaneously achieved liquid-phase ablation and light *** formation mechanism of the core-shell nanoparticles is to prepare the nanonuclei first by laser liquid-phase ablation and then the nanosheets by light exfoliation;the nanosheets will wrap the nanonuclei layer by layer through van der Waals forces to form core-shell *** MoS_(2)core-shell nanoparticles,because of Mo-S bond breakage and recombination,have high chemical activity for chemical ***,the nanoparticles were used as a reducing agent to directly prepare three-dimensional(3D)Au-MoS_(2)micro/nanostructures,which were applied as surface-enhanced Raman spectroscopy(SERS)substrates to explore chemical sensing *** ultrahigh enhancement factor(1.06×10^(11)),ultralow detection limit(10-13M),and good SERS adaptability demonstrate highly sensitive SERS activity,great ability of ultralow concentration detection,and ability to detect diverse analytes,*** work reveals the tremendous potential of 3D Au-MoS_(2)composite structures as excellent SERS substrates for chemical and biological sensing.

关键词： MoS_(2)core-shell nanoparticle femtosecond laser liquid-phase ablation light exfoliation 3D Au-MoS_(2)composite structure chemical sensing

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Compact topological edge modes through hybrid coupling of orbital angular momentum modes

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Physical Review A 2024年第6期109卷 063516-063516页

作者： Yang Wang Chuang Jiang Miaomiao Zhao Dong Zhao Shaolin Ke School of Electrical and Information Engineering Hubei Key Laboratory of Optical Information and Pattern Recognition

Topological waveguide arrays, which support robust light propagation through edge modes, offer a promising solution for fault-tolerant photonic chips. However, these arrays commonly require a considerable number of waveguide elements to ensure their topological protection, leading to increased footprint and fabrication costs. Here, we propose a topological waveguide array with only a few cells based on a photonic Aharonov-Bohm (AB) cage. This design is advantageous because the edge modes become compactly localized at the boundary waveguides. We achieve this by utilizing the orbital hybridization of the fundamental mode and first-order orbital angular momentum (OAM) modes to construct the AB cage, where arbitrary flux of artificial gauge fields (AGFs) can be generated and controlled by adjusting the angle between adjacent waveguides. Notably, these edge modes exhibit robustness against disorders of on-site potential and coupling, even within a small lattice. Furthermore, we demonstrate the extension of this mechanism to high-order OAM modes. Our work paves the way for miniaturizing topological devices using the orbital degree of freedom, holding the potential for exploring other AGF-enriched phenomena.

关键词： Topological effects in photonic systems Waveguides

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Orientation dependence in high harmonics of ZnO with polarization corrections to counteract the birefringent effect

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Chinese Physics B 2021年第7期30卷 269-273页

作者： Yin-Fu Zhang Teng-Fei Huang Jia-Peng Li Ke Yang Liang Li Xiao-Song Zhu Peng-Fei Lan Pei-Xiang Lu School of Physics and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205China CAS Center for Excellence in Ultraintense Laser Science Shanghai 201800China

We investigate the influence of the birefringence on the high-order harmonics in an a-cut Zn O crystal with midinfrared laser *** high harmonics exhibit strong dependence on the alignment of the crystal with respect to the laser *** introduce the Jones calculus to counteract the birefringent effect and obtain the harmonics with polarization corrections in Zn *** show that the birefringent effect plays an important role in the orientation dependence of HHG.

关键词： high-order harmonics birefringent effect Jones calculus

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A correction method for aero-optics thermal radiation effects based on gradient distribution and dark channel

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Optoelectronics Letters 2019年第5期15卷 374-380页

作者： HONG Han-yu SHI Yu ZHANG Tian-xu LIU Zhao Hubei Key Laboratory of Optical Information and Pattern Recognition Hubei Research Centre of Video Image and High Definition Projection School of Electrical and Information Engineering Wuhan Institute of Technology Wuhan 430074 China National Key Laboratory of Science and Technology on Multi-Spectral Information Processing School of Automation Huazhong University of Science and Technology Wuhan 430074 China

In this paper, a new algorithm is proposed to remove the effects of aerodynamic optical thermal radiation from a single infrared image. In this method, the joint probability model of gradient distribution is introduced by studying the "global smoothing and local fluctuation" characteristics of the bias field. A prior L0 norm of dark channel is introduced to constrain the latent clear image. Finally, the split Bregman method is used to solve the optimization problem. The effectiveness of the proposed method is verified by a series of experiments, and the results are compared with the results of the existing methods for the correction of thermal radiation effects.

关键词： aero-optics thermal radiation effects gradient distribution dark channel

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Question-Driven Multiple Attention(DQMA) Model for Visual Question Answer

Question-Driven Multiple Attention(DQMA) Model for Visual Qu...

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2022 International Conference on Artificial Intelligence and Computer information Technology, AICIT 2022

作者： Wu, Jinmeng Ge, Fulin Shu, Pengcheng Ma, Lei Hao, Yanbin Wuhan Institute of Technology Hubei Key Laboratory of Optical Information and Pattern Recognition China University of Science and Technology of China College of Information Science and Technology China

ISBN: (数字)9781665450874

ISBN: (纸本)9781665450874

Visual Question and Answer (VQA) refers to a typical multimodal problem in the fields of computer vision and natural language processing, which aims to give an open-ended question about an image that can be answered accurately. The currently existing visual question answer models inevitably introduce redundant and inaccurate visual information when exploring the rich interaction between complex image targets and texts, and they also fail to focus effectively on the targets in the scene. To address this problem, the Question-Driven Multiple Attention Model (QDMA) is proposed. Firstly, Faster R-CNN and LSTM are used to extract visual features of images and textual features of questions. Then we design a question-driven attention network to obtain question regions of interest in images so that the model can accurately target relevant targets in complex scenes. To establish intensive interaction between the image region of interest and the question word, the co-attentive network consisting of self-attentive and guided-attentive units is introduced. Finally, the correct answer is obtained by inputting question features and image features into an answer prediction module consisting of two-layer Multi-Layer Perceptron. On the VQA2.0 dataset, the suggested method is empirically compared with other methods. The results reveal that the model outperforms other methods, demonstrating the usefulness of the framework. © 2022 IEEE.

关键词： Long short-term memory

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