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2024 International Conference on Computer Application and Information Security, ICCAIS 2024

作者： Wei, Xiaotan Li, Zhensong Wang, Yutong Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781510689312

Object detection technology serves as a crucial tool in remote sensing imagery analysis. However, the significant variations in object scales and complex backgrounds in remote sensing images pose substantial challenges, particularly for small object detection. To address these challenges, this paper proposes an improved network architecture based on YOLOv8n (You Only Look Once). First, the FAB (Feature Augmentation Block) module is introduced into the shallow and intermediate layers of the backbone network, enhancing feature representation through multi-scale convolution and residual connections to improve sensitivity to small objects. Second, the Dattention (Deformable Attention) module is incorporated into the deeper layers, leveraging deformable attention mechanisms to effectively focus on object regions while mitigating interference from complex backgrounds. Lastly, the original convolution modules in the Neck are replaced with the AKConv (Adaptive Kernel Convolution) module, which dynamically adjusts kernel sizes to enhance adaptability to multi-scale objects and improve feature extraction. Experimental results on the NWPU VHR-10 dataset demonstrate that the proposed model achieves a 2.5% improvement in mAP compared to the original YOLOv8n model, while reducing the parameter count to 2.6M, achieving lightweight optimization alongside enhanced detection accuracy. © The Authors.

关键词： Object detection

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Delayed optical feedback-regulated artificial soliton molecule in a femtosecond optical parametric oscillator

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PhotoniX 2024年第1期5卷 34-53页

作者： Yu Cai Jintao Fan Fanchao Meng Youjian Song Minglie Hu Ultrafast Laser Laboratory State Key Laboratory of Precision Measurement Technology and InstrumentsTianjin UniversityTianjin 300072China Ultrafast Laser Laboratory College of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin 300072China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

Soliton molecules(SMs)play a crucial role in nonlinear optical systems,enriching our understanding of nonlinear science through the study of their interaction *** passively mode-locked fiber lasers offer an efficient platform for generating diverse types of SMs,the complex internal dynamics of the laser often pose challenges in achieving predetermined temporal separations between ***,we implement a delayed optical feedback technique within a femtosecond optical parametric oscillator,enabling the generation of SMs with precise and controllable temporal separations.A theoretical model,which models the intracavity iterations of the signal with a simplified Ikeda map,is proposed to study the impact of parametric gain,intracavity feedback delay,and cavity length on the internal separations of the *** experimental results confirm that adjusting the cavity length allows for producing desired temporal separations within *** reveal the evolution dynamics of the SMs,we further develop a rigorous numerical model using the carrier-resolved Forward Maxwell Equation,which is capable of modeling ultra-broadband complex dynamics based on a single equation without relying on the slowly-varying envelope *** numerical model unveils the rich formation dynamics of the SMs at various separations,which confirms the critical role of the gain window provided by the *** work opens up new opportunities for the on-demand generation of SMs and provides valuable insights into the complex dynamics in femtosecond optical parametric oscillator systems with optical delayed feedback.

关键词： Soliton molecule Femtosecond Optical parametric oscillator Delayed optical feedback

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Segmented Real-time Dispatch Model and Stochastic Robust Optimization for Power-gas Integrated Systems with Wind Power Uncertainty

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Journal of Modern Power Systems and Clean Energy 2023年第5期11卷 1480-1493页

作者： Ying Wang Kaiping Qu Kaifeng Zhang Key Laboratory of Measurement and Control of CSE Ministry of EducationSchool of AutomationSoutheast UniversityNanjingChina School of Electrical Engineering China University of Mining and TechnologyXuzhouChina

This paper develops a segmented real-time dispatch model for power-gas integrated systems(PGISs), where power-to-gas(P2G) devices and traditional automatic generation control units are cooperated to manage wind power uncertainty. To improve the economics of the real-time dispatch in regard to the current high operation cost of P2Gs, the wind power uncertainty set is divided into several segments, and a segmented linear decision rule is developed, which assigns adjustment tasks differently when wind power uncertainty falls into different segments. Thus, the P2G operation with high costs can be reduced in real-time adjustment. Besides, a novel segmented stochastic robust optimization is proposed to improve the efficiency and robustness of PGIS dispatch under wind power uncertainty, which minimizes the expected cost under the empirical wind power distribution and builds up the security constraints based on the robust optimization. The expected cost is formulated using a Nataf conversion-based multi-point estimate method, and the optimal number of estimate points is determined through sensitivity analysis. Furthermore, a difference-ofconvex optimization with a partial relaxation rule is developed to solve the non-convex dispatch problem in a sequential optimization framework. Numerical simulations in two testing cases validate the effectiveness of the proposed model and solving method.

关键词： Power-gas integrated system robust optimization real-time dispatch multi-point estimate method differenceof-convex optimization

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Dual-species atomic interferometric sensor for simultaneous inertial measurement and clock operation 9

Dual-species atomic interferometric sensor for simultaneous ...

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9th Symposium on Frequency Standards and Metrology, FSM 2023

作者： Yan, Peiqiang Jia, Weichen Wang, Shengzhe Feng, Yanying State Key Laboratory of Precision Measurement Technology and Instruments China Department of Precision Instrument Tsinghua University Beijing Beijing China

The atomic interferometer, serving as a precise measurement tool for multiple physical quantities, holds the potential to establish a fully quantum autonomous "position, navigation, and timing (PNT)"unit. This paper introduces a method for simultaneous inertial measurement and clock operation based on atom interferometry with dual-isotope atomic beams. The corresponding related experimental progress is also reported. A 87Rb Raman-Mach-Zehnder interferometer is presented with a fringe contrast of C = 0.05, providing a foundational sample for further experiments. © Published under licence by IOP Publishing Ltd.

关键词： Atoms

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5G Ultra-Dense Network Fingerprint Positioning Method Based on Matrix Completion

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China Communications 2023年第3期20卷 105-118页

作者： Yuexia Zhang Chong Liu Key Laboratory of Information and Communication Systems Ministry of Information IndustryBeijing Information Science and Technology UniversityBeijing 100101China Key Laboratory of Modern Measurement and Control Technology Ministry of EducationBeijing Information Science and Technology UniversityBeijing 100101China

The problem of high-precision indoor positioning in the 5G era has attracted more and more attention.A fingerprint location method based on matrix completion(MC-FPL)is proposed for 5G ultradense networks to overcome the high costs of traditional fingerprint database construction and matching ***,a partial fingerprint database constructed and the accelerated proximal gradient algorithm is used to fill the partial fingerprint database to construct a full fingerprint ***,a fingerprint database division method based on the strongest received signal strength indicator is proposed,which divides the original fingerprint database into several sub-fingerprint ***,a classification weighted K-nearest neighbor fingerprint matching algorithm is *** estimated coordinates of the point to be located can be obtained by fingerprint matching in a sub-fingerprint *** simulation results show that the MC-FPL algorithm can reduce the complexity of database construction and fingerprint matching and has higher positioning accuracy compared with the traditional fingerprint algorithm.

关键词： indoor positioning fingerprint matching matrix completion 5G UDN RSSI

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STUDY ON COUPLING FAULT DIAGNOSIS OF THE PLANETARY TRANSMISSION GEARBOX BY USING WAVELET TRANSFORM AND 1DCNN 10

STUDY ON COUPLING FAULT DIAGNOSIS OF THE PLANETARY TRANSMISS...

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10th International Symposium on Test Automation and instrumentation, ISTAI 2024

作者： Qiu, Baolin Ma, Chao Wang, Shaohong Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology Beijing China Beijing Key Lab of Measurement and Control of Mechanical and Electrical System Beijing Information Science and Technology Beijing China

ISBN: (纸本)9781837242672

Considering the susceptibility of planetary transmission to strong noise interference, a fault diagnosis method is proposed based on Morlet wavelet transform and 1D Convolutional Neural Network (1DCNN). Firstly, the acceleration captured from the transmission is dealt with angle resampling to reduce the dependence of speed on signal characteristics, and band-pass filtering is performed, which parameter is determined by using the fast spectral kurtosis algorithm. Subsequently, the filtered data is decomposed into several multiple intrinsic mode function (IMF) components with the EEMD algorithm and reconstructed according to the correlation coefficient parameter. Then reconstructed data is subjected to further noise reduction processing using wavelet transform and the amplitude in the scale parameter with the highest kurtosis as the input to 1DCNN for training and fault diagnosis classification. The experimental results show that the proposed method can effectively reduce noise interference, the fault diagnosis accuracy of the processed data is relatively high. The fault diagnosis accuracy of the processed data is significantly higher than that of the raw data. © The Institution of Engineering & technology 2024.

关键词： Noise abatement

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High-operating-temperature mid-infrared photodetectors via quantum dot gradient homojunction

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Light(Science & Applications) 2023年第3期12卷 355-365页

作者： Xiaomeng Xue Menglu Chen Yuning Luo Tianling Qin Xin Tang Qun Hao School of Optics and Photonics Beijing Institute of TechnologyNo.5 Zhongguancun South StreetBeijingChina Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology BeijingChina Yangtze Delta Region Academy of Beijing Institute of Technology BeijingChina

Due to thermal carriers generated by a narrow mid-infrared energy gap,cooling is always necessary to achieve ideal *** quantum dot(QD),the electron thermal generation should be reduced with quantum confinement in all three *** a result,there would be a great potential to realize high-operating-temperature(HOT)QD mid-IR photodetectors,though not yet *** the advantages of colloidal nanocrystals’solution processability and precise doping control by surface dipoles,this work demonstrates a HOT mid-infrared photodetector with a QD gradient *** detector achieves background-limited performance with D^(*)=2.7×1011 Jones on 4.2μm at 80 K,above 10^(11) Jones until 200 K,above 10^(10 )Jones until 280 K,and 7.6×10^(9) Jones on 3.5μm at 300 *** external quantum efficiency also achieves more than 77%with responsivity 2.7 A/W at zero *** applications such as spectrometers,chemical sensors,and thermal cameras,are also approved,which motivate interest in low-cost,solution-processed and high-performance mid-infrared photodetection beyond epitaxial growth bulk photodetectors.

关键词： quantum gradient precise

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measurement techniques for aspheric surface parameters

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Light(Advanced Manufacturing) 2023年第3期4卷 292-310页

作者： Qun Hao Yiming Liu Yao Hu Xin Tao Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Aspheric surfaces are widely used in advanced optical *** the aspheric surface parameters(ASPs)with high accuracy is vital for manufacturing and aligning optical aspheric *** paper provides a review of various techniques for measuring ASPs and discusses the advantages/disadvantages of these *** aim of this review is to contribute to advancements in the fabrication and testing of aspheric optical elements and their practical applications in diverse fields.

关键词： measurement technique Aspheric surface Parameter

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DSCCNet for high-quality 4K computer-generated holograms

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Optics Express 2025年第6期33卷 13733-13747页

作者： Xu, Zhenqi Leng, Junmin Dai, Ping Wang, Chao Key Laboratory of Information and Communication Systems Ministry of Information Industry Beijing Information Science and Technology University Beijing100101 China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science and Technology University Beijing100101 China School of Information and Communications Engineering Beijing Information Science and Technology University Beijing100101 China

With the increasing demand for high-quality 3D holographic reconstruction, visual clarity and accuracy remain significant challenges in various imaging applications. Current methods struggle for higher image resolution and to resolve such issues as detail loss and checkerboard artifacts. To address these challenges, we propose the model Depthwise Separable Complex-valued Convolutional Network (DSCCNet) for phase-only computer-generated holography (CGH). This deep learning framework integrates complex-valued convolutions with depthwise separable convolutions to enhance reconstruction precision and improve model training efficiency. Additionally, the diffuser is employed to reduce checkerboard artifacts in defocused parts of 3D CGH. Experimental results demonstrate that DSCCNet can obtain 4K images reconstructed with more intricate details. The reconstruction quality of both 2D and 3D layered objects is enhanced. Validation on 100 images from the DIV2K dataset shows an average PSNR above 37 dB and an average SSIM above 0.95. The proposed model provides an effective solution for high-quality CGH applications. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Computer generated holography

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Joint Task Offloading and Resource Allocation Strategy for Space-Air-Ground Integrated Vehicular Networks

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清华大学学报自然科学版（英文版） 2025年第3期30卷 1027-1043页

作者： Yuanshuo Gang Yuexia Zhang Zhihai Zhuo School of Information and Communication Engineering Beijing Information Science and Technology UniversityBeijing 100101China Key Laboratory of Modern Measurement and Control Technology Ministry of EducationBeijing Information Science and Technology UniversityBeijing 100101China

Space-Air-Ground integrated Vehicular Network(SAGVN)aims to achieve ubiquitous connectivity and provide abundant computational resources to enhance the performance and efficiency of the vehicular ***,there are still challenges to overcome,including the scheduling of multilayered computational resources and the scarcity of spectrum *** address these problems,we propose a joint Task Offloading(TO)and Resource Allocation(RA)strategy in SAGVN(namely JTRSS).This strategy establishes an SAGVN model that incorporates air and space networks to expand the options for vehicular TO,and enhances the edge-computing resources of the system by deploying edge *** minimize the system average cost,we use the JTRSS algorithm to decompose the original problem into a number of subproblems.A maximum rate matching algorithm is used to address the channel allocation and the Lagrangian multiplier method is employed for computational *** acquire the optimal TO decision,a differential fusion cuckoo search algorithm is *** simulation results demonstrate the significant superiority of the JTRSS algorithm in optimizing the system average cost.

关键词： edge computing Resource Allocation(RA) Space-Air-Ground integrated Vehicular Network(SAGVN) Task Offloading(TO)

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