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Density-matrix-formalism based scheme for polarization mode dispersion monitoring and compensation in optical fiber communication systems

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Optoelectronics Letters 2023年第12期19卷 739-743页

作者： DU Qiuping ZHANG Xia GUO Yao YANG Zhenshan ZHANG Xiaoguang School of Physics Science and Information Engineering Shandong Provincial Key Laboratory of Optical Communications Science and TechnologyLiaocheng UniversityLiaocheng 252000China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

We propose a density-matrix-formalism based scheme to study polarization mode dispersion(PMD)monitoring and compensation in optical fiber communication *** to traditional monitoring and compensation schemes based on the PMD vector in the Stokes space,the scheme we proposed requires no auxiliary matrices and can be handily extended to any higher-dimensional modal space,which is advantageous in mode-division multiplexing(MDM)systems.A 28 GBaud polarization division multiplexing quadrature phase-shift keying(PDM-QPSK)coherent simulation system is built to demonstrate that our scheme can implement the monitoring and compensation of 170 ps large differential-group-delay(DGD)that far exceeds the typical DGDs in practical optical communication *** results verify the effectiveness of the density-matrix-formalism based scheme in PMD monitoring and compensation,thus pave the way for further applications of the scheme in more general MDM optical communication systems.

关键词： polarization communication fiber

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Research on The Architecture of an Intelligent Assistant system for Commanders

Research on The Architecture of an Intelligent Assistant Sys...

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IEEE International Conference on Software engineering and Service sciences (ICSESS)

作者： Xin Jin Yu Wang Wei Wu Xiaodong Li Engineering Laboratory Science and Technology on Information System Nanjing China

Battle commanders in modern war are facing new challenges such as massive information and short time windows. There is an urgent demand of intelligent assistant system to communicate with the commanders and staff officers, think about what they think, answer their questions, offer advises to their decision making, learn their experiences, and significantly improve their performance. Based on capability requirements analysis of such system, its system architecture was proposed, which shares data, knowledge, functions and computing power with the command information system currently in use. An AI framework based technical architecture was proposed, which has five characteristics: natural human-computer interaction, flexible function integration, knowledge system driven, continues ability evolution, and powerful computing support.

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Nanowires mediated growth ofβ-Ga_(2)O_(3)nanobelts for hightemperature(>573 K)solar-blind photodetectors

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Nano Research 2023年第4期16卷 5548-5554页

作者： Xiaobin Zou Dongyu Xie Yong Sun Chengxin Wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies and Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China

β-Ga_(2)O_(3),with ultra-wide bandgap,high absorption coefficient for high-energy ultraviolet(UV)photons,and high structural stability toward harsh-environment,has been receiving persistent attention for deep ultraviolet photodetectors ***,realization of devices with high tolerance toward high temperature faces great challenges due to considerable background signals mainly arising from abundant thermal excited ***,nanowire-mediated high-qualityβ-Ga_(2)O_(3)nanobelts with ultra-thin thickness and length up to several hundred micrometers were achieved via a simple catalyst-free chemical vapor deposition *** resulted microdevice output superior optoelectric figure of merits among numerous reports aboutβ-Ga_(2)O_(3),i.e.,ultra-low dark current(below the detection limit of 10−12 A),high responsivity(1,320 A/W),and high spectral selectivity working under low voltage(~2 V).More importantly,the performance remains robust at elevated temperature higher than 573 *** results indicate a large prospect for low-voltage driven deep ultraviolet photodetectors with good sensitivity and stability at harsh environments.

关键词： β-Ga_(2)O_(3) low-dimensional nanostructures chemical vapor deposition high temperature photodetectors solar-blind photodetectors

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Simultaneous segmentation and classification of colon cancer polyp images using a dual branch multi-task learning network

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Mathematical Biosciences and engineering 2024年第2期21卷 2024-2049页

作者： Li, Chenqian Liu, Jun Tang, Jinshan School of Computer Science and Technology Wuhan University of Science and Technology Wuhan430065 China Hubei Province Key Laboratory of Intelligent Information Processing and Real-Time Industrial System Wuhan430065 China Department of Health Administration and Policy College of Public Health George Mason University FairfaxVA22030 United States

Accurate classification and segmentation of polyps are two important tasks in the diagnosis and treatment of colorectal cancers. Existing models perform segmentation and classification separately and do not fully make use of the correlation between the two tasks. Furthermore, polyps exhibit random regions and varying shapes and sizes, and they often share similar boundaries and backgrounds. However, existing models fail to consider these factors and thus are not robust because of their inherent limitations. To address these issues, we developed a multi-task network that performs both segmentation and classification simultaneously and can cope with the aforementioned factors effectively. Our proposed network possesses a dual-branch structure, comprising a transformer branch and a convolutional neural network (CNN) branch. This approach enhances local details within the global representation, improving both local feature awareness and global contextual understanding, thus contributing to the improved preservation of polyp-related information. Additionally, we have designed a feature interaction module (FIM) aimed at bridging the semantic gap between the two branches and facilitating the integration of diverse semantic information from both branches. This integration enables the full capture of global context information and local details related to polyps. To prevent the loss of edge detail information crucial for polyp identification, we have introduced a reverse attention boundary enhancement (RABE) module to gradually enhance edge structures and detailed information within polyp regions. Finally, we conducted extensive experiments on five publicly available datasets to evaluate the performance of our method in both polyp segmentation and classification tasks. The experimental results confirm that our proposed method outperforms other state-of-the-art methods. ©2024 the Author(s), licensee AIMS Press.

关键词： Classification (of information)

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Effect of growth interruption time on the quality of InAs/GaSb type-Ⅱ superlattice grown by molecular beam epitaxy

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Optoelectronics Letters 2023年第3期19卷 155-158页

作者： LIU Zhaojun ZHU Lianqing ZHENG Xiantong LU Lidan ZHANG Dongliang LIU Yuan School of Opto-Electronic Engineering Changchun University of Science and TechnologyChangchun 130022China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science&Technology UniversityBeijing 100192China

We systematically investigate the influence of growth interruption time on the properties of In As/Ga Sb type-II superlattices(T2SLs) epitaxial materials grown by molecular beam epitaxy(MBE). X-ray diffraction(XRD) and atomic force microscope(AFM) are used to characterize the material quality and morphology. The full width at half maximum(FWHM) of the XRD 0th satellite peaks ranges from 32″ to 41″, and the root mean square(RMS) roughness on a 5 μm×5 μm scan area is 0.2 nm. Photoluminescence(PL) test is used to reveal the influence of the growth interruption time on the optical property. Grazing incidence X-ray reflectivity(GIXRR) measurements are performed to analyze the roughness of the interface. The interface roughness(0.24 nm) is optimal when the interruption time is 0.5 s. The crystal quality of T2SLs can be optimized with appropriate interruption time by MBE, which is a guide for the material epitaxy of high performance T2SL infrared detector.

关键词： roughness interrupt beam

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Design and validation of a combined system for in situ measurement of photosensitizer fluorescence and tissue diffuse reflectance 14

Design and validation of a combined system for in situ measu...

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Optics in Health Care and Biomedical Optics XIV 2024

作者： Zhan, Huiqi Guo, Xingran Ke, Cheng Peng, Weijin Cui, Shengdong Huang, Zheng MOE Key Laboratory of Medical Optoelectronics Science and Technology Key Laboratory of Photonics Technology of Fujian Province School of Optoelectronics and Information Engineering Fujian Normal University Fuzhou China

ISBN: (纸本)9781510682122

Background: Quantitative measurement of photosensitizer during photodynamic therapy (PDT) is critical. One of the practical approaches is to measure photosensitizer’s fluorescence, however, the influence of tissue optic properties needs to be considered in in situ measurement. Objective: To design and validate a combined system for dual detection of fluorescence and tissue diffuse reflectance. Materials and Method:For fluorescence detection, a 405 nm laser was used for excitation, a power meter for monitoring laser power and a fiber optic spectrometer for recording fluorescence. For diffuse reflectance measurement, a halogen lamp was used as light source and a fiber optic spectrometer for recording diffuse reflectance. Hemoporfin (HMME) was used as a model photosensitizer. Mice were used to evaluate the dual detection function of fluorescence and tissue diffuse reflectance after i.v. injection of HMME. Results: Solutions of different concentrations of HMME were used to test the intensity responses of the fluorescence detection system. A linear correlation was observed at HMME concentration lower than 10 μg/ml. Dual-band correction using corresponding diffuse reflectance data was used for the correction of original fluorescence spectrum. Diffuse reflectance corrected fluorescence data might truly reflect HMME concentration in the skin tissue. Conclusion: The preliminary evaluation suggests that the combined system can be used for quantitative measurement of photosensitizer fluorescence. © 2024 SPIE.

关键词： Fluorescence Diffuse reflectance spectroscopy Tissues Photodynamic therapy Skin

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Space-Time Suppression of Self-Interference and Inter-Symbol Interference for Target Detection in ISAC systems

Space-Time Suppression of Self-Interference and Inter-Symbol...

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2024 Conference on Spectral technology and Applications, CSTA 2024

作者： Chen, Yating Wen, Cai Huang, Yan Chen, Zhanye Hong, Wei State Key Laboratory of Millimeter Waves School of Information Science and Engineering Southeast University Nanjing211100 China School of Information Science and Technology Northwest University Xi'an710127 China

ISBN: (纸本)9781510683082

Utilizing existing communication infrastructures and signals for target detection encounters many challenges. Among them, the inherent self-interference in monostatic multiple-input multiple-output (MIMO) systems, along with the inter-symbol interference resulting from continuous signal transmission, severely degrades the detection performance. To suppress the self-interference and inter-symbol interference at receiver, we propose a space-time processing method in this paper. Our approach involves the design of beamforming vectors to mitigate self-interference in the spatial domain, and the design of a filter in the time domain for suppressing inter-symbol interference. An optimization problem for beamforming vector is formulated to maximize the signal to interference plus noise ratio (SINR) at receiver. Successive convex approximation (SCA) is deployed to obtain optimal beamforming vectors. Additionally, a filter in time domain is designed to lower the sidelobe and retain the peak value of the filtering output at receiver. Meanwhile, the inter-symbol interference brought by continuous transmission is also constrained by designing the filter. Numerical simulation demonstrates the effectiveness of our space-time processing method in suppressing both self-interference and inter-symbol interference, thereby enhancing overall detection performance. © 2024 SPIE.

关键词： Intersymbol interference

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Dual Cross-Stage Partial Learning for Detecting Objects in Dehazed Images 24

Dual Cross-Stage Partial Learning for Detecting Objects in D...

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24th IEEE International Conference on Data Mining, ICDM 2024

作者： Zhao, Jinbiao Zhang, Zhao Ren, Jiahuan Zhang, Haijun Zhao, Zhongqiu Wang, Meng School of Computer Science and Information Engineering Hefei University of Technology Hefei China Yunnan Key Laboratory of Software Engineering Yunan China Harbin Institute of Technology Department of Computer Science Shenzhen China

ISBN: (纸本)9798331506681

Performing an object detection task after the restoration of a hazy image, or rather detecting with the network backbone directly, will result in the inclusion of information mixed with dehazing, which tends to interfere with detection performance. To address these issues, we propose a novel framework for detecting objects in dehazed images via Dual Cross-Stage Partial Learning (DCSP). Specifically, we introduce a Cross-Stage Partial (CSP) module for extracting clean feature information after dehazing. Secondly, to enhance data integrity, we employ a skip-input strategy to supplement information related to object detection features that may be lost during the dehazing task, while avoiding the gradient vanishing problem. In addition, CSP is also introduced to facilitate comprehensive learning of multiple feature representations. Finally, to avoid the inclusion of irrelevant dehazing information in detection, we apply a Ground-Truth Flow at detection network (at dark3), for fine feature information calibration. Additionally, we created a synthetic fog dataset to expand the training data for DCSP. Experimental results on both synthetic and real-world datasets demonstrate the effectiveness and accuracy of the proposed method. The code is available at https://***/zhaojinbiao/DCSP. © 2024 IEEE.

关键词： Demulsification

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Adaptive Containment Control for Fractional-Order Nonlinear Multi-Agent systems With Time-Varying Parameters

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IEEE/CAA Journal of Automatica Sinica 2022年第9期9卷 1627-1638页

作者： Yang Liu Huaguang Zhang Yingchun Wang Hongjing Liang the College of Information Science and Engineering Northeastern UniversityShenyang 110004China the State Key Laboratory of Synthetical Automation for Process Industries and also with the School of Information Science and EngineeringNortheastern UniversityShenyang 110004China the School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

This paper investigates adaptive containment control for a class of fractional-order multi-agent systems(FOMASs)with time-varying parameters and *** using the bounded estimation method,the difficulty generated by the timevarying parameters and disturbances is *** command filter is introduced to solve the complexity problem inherent in adaptive backstepping ***,in order to eliminate the effect of filter errors,a novel distributed error compensating scheme is constructed,in which only the local information from the neighbor agents is ***,a distributed adaptive containment control scheme for FOMASs is developed based on backstepping to guarantee that the outputs of all the followers are steered to the convex hull spanned by the *** on the extension of Barbalat's lemma to fractional-order integrals,it can be proven that the containment errors and the compensating signals have asymptotic ***,three simulation examples are given to show the feasibility and effectiveness of the proposed control method.

关键词： Adaptive backstepping control command filter fractional-order multi-agent system time-varying parameters

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Leveraging IR based sequence and graph features for source-binary code alignment 4

Leveraging IR based sequence and graph features for source-b...

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4th International Conference on Neural Networks, information and Communication engineering, NNICE 2024

作者： Yu, Zhouqian Zhang, Wei Xu, Tao Beijing Information Science and Technology University Computer School Beijing China Beijing Information Science and Technology University Beijing Laboratory of National Economic Security Early-Warning Engineering Beijing China Tsinghua University Department of Computer Science and Technology Beijing China

ISBN: (纸本)9798350394375

Code similarity analysis is a versatile technique that can be applied across various domains, including code clone detection, code search, malware detection, patch analysis, and vulnerability search. The core of source-binary code similarity analysis lies in effective modeling of the both of source code and binary code. Existing researches have overlooked the fact that code has both text and graph structure features, so they usually only use one of these features for modeling. In this paper, we propose a method that combines sequence features based on intermediate representation and program graph features derived from intermediate representation to enhance the capture of program semantics. Our approach involves the parallel embedding and learning of LLVM IR and the derived program graphs, leading to the extraction of the final code feature representation. Furthermore, we employ a triplet-loss network to identify code characteristic disparities and produce similarity rankings. The experimental results have demonstrated that our approach outperforms other models on the baseline, achieving a 6% improvement in accuracy for source-binary code similarity tasks. © 2024 IEEE.

关键词： Graph neural networks

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