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arXiv 2023年

作者： Shi, Baihua Wang, Yang Li, Danqi Cai, Wenlong Lin, Jinyong Zhang, Shuo Shi, Weiping Yan, Shihao Shu, Feng The School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing210094 China The School of Information and Communication Engineering Hainan University Haikou570228 China The National Key Laboratory of Science and Technology on Aerospace Intelligence Control Beijing Aerospace Automatic Control Institute Beijing100854 China The School of Science Security Research Institute Edith Cowan University PerthWA6027 Australia

Different with conventional reconfigurable intelligent surface (RIS), simultaneous transmitting and reflecting RIS (STAR-RIS) can reflect and transmit the signals to the receiver. In this paper, to serve more ground users and increase the deployment flexibility, we investigate an unmanned aerial vehicle equipped with a STAR-RIS (STAR-RIS-UAV) aided wireless communications for multi-user networks. Energy splitting (ES) and mode switching (MS) protocols are considered to control the reflection and transmission coefficients of STAR-RIS elements. To maximize the sum rate of the STAR-RIS-UAV aided coordinated multipoint cellular system for multi-user networks, the corresponding beamforming vectors as well as transmitted and reflected coefficients matrices are optimized. Specifically, instead of adopting the alternating optimization, we design an iteration method to optimize all variables for both ES and MS protocols at the same time. Simulation results reveal that STAR-RIS-UAV aided wireless communication system has a much higher sum rate than the system with conventional RIS or without RIS. Furthermore, the proposed structure is more flexible than a fixed STAR-RIS and could greatly promote the sum rate. Copyright © 2023, The Authors. All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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Raman Spectra, Chemical Bonds And Dielectric Properties of Calanbwo 8 Ceramics

SSRN

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SSRN 2024年

作者： Li, Yingxiang Liu, Wei Pang, Xianying Xiao, Lei Oad, Ammar Peng, Sen Liang, Deyin Tang, Bin Fang, Zixuan Shi, Zitao Chen, Jingjing Wang, Fei He, Chuansheng Hou, Zegui Liu, Weichun Sun, Yuxin Xue, Yan Li, Hao College of Information Engineering Shaoyang University Shaoyang422000 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu611731 China School of Civil Engineering and Geomatics Southwest Petroleum University Chengdu610500 China College of Electrical and Information Engineering Hunan University Changsha410082 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China Southwest Jiaotong University Hope College Chengdu610000 China School of Electronic and Communication Engineering Shenzhen Polytechnic Shenzhen518055 China

A novel CaLaNbWO8 (CLNWO) ceramic was prepared using traditional solid-state methods. The CLNWO ceramics that were sintered at 1440°C displayed noteworthy dielectric properties, with Εr = 11.18, Q×f = 32,998 GHz, and τf = −8.1 ppm/°C. The trends in Εr and Q×f were indirectly reflected through the Raman shift and FWHM in Raman spectroscopy. Through bond valence analysis, it was determined that Ca2+ and La3+ have significant compression effects in CLNWO ceramics, and the αc was less than αtheo. This discrepancy resulted in the Εr of CLNWO ceramics being less than Εtheo. According to Phillips-Vechten-Levine (P-V-L) theory, the W-O bond primarily determined τf, and Q×f, whereas Εr was noticeably influenced by the La-O bond. © 2024, The Authors. All rights reserved.

关键词： Raman scattering

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Reconfigurable Metagrating Enabled by Shape Memory Polymers

Reconfigurable Metagrating Enabled by Shape Memory Polymers

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IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

作者： Sidi Wang Kai Feng Jianjia Yi Key Laboratory of Integrated Services Network Xidian University Xi’an China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin China School of Information and Communications Engineering Xi’an Jiaotong University Xi’an China State Key Laboratory of Millimeter Waves Southeast University Nanjing China

We propose and demonstrate a shape-controlled metagrating with adjustable energy distribution based on shape memory Polymers (SMPs). The design consists of a capacitance printed on the top of the FR4 substrate, SMPs substrate (VeroWhitePlus) in the middle layer, and a metallic ground at the bottom. Using the perfect diffraction theory to design reconfigurable metagratings based on shape memory polymers is. Furthermore, the functionalities of the designed shape-controlled tunable metagrating are investigated by full-wave simulations. Simulation results show that the reconfigurable metagrating can achieve energy bisection of +1, -1 order and the energy trisection of +1, 0, -1 order. And the proposed reconfigurable metagrating is experimentally demonstrated. The design breaks through the limitation that the traditional electrically tunable reconfigurable metagratings need external power supply, and provides a new design idea for the dynamic control of energy distribution of the reconfigurable metagratings.

关键词： Radio frequency Shape Diffraction Simulation Switched mode power supplies Process control Holography

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Fast Fourier single-pixel imaging based on Sierra–Lite dithering algorithm

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Chinese Physics B 2019年第6期28卷 189-194页

作者： Zhen-Yu Liang Zheng-Dong Cheng Yan-Yan Liu Kuai-Kuai Yu Yang-Di Hu National University of Defense Technology State Key Laboratory of Pulsed Power Laser TechnologyHefei 230037China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300000China

The single-pixel imaging(SPI) technique is able to capture two-dimensional(2 D) images without conventional array sensors by using a photodiode. As a novel scheme, Fourier single-pixel imaging(FSI) has been proven capable of reconstructing high-quality images. Due to the fact that the Fourier basis patterns(also known as grayscale sinusoidal patterns)cannot be well displayed on the digital micromirror device(DMD), a fast FSI system is proposed to solve this problem by binarizing Fourier pattern through a dithering algorithm. However, the traditional dithering algorithm leads to low quality as the extra noise is inevitably induced in the reconstructed images. In this paper, we report a better dithering algorithm to binarize Fourier pattern, which utilizes the Sierra–Lite kernel function by a serpentine scanning method. Numerical simulation and experiment demonstrate that the proposed algorithm is able to achieve higher quality under different sampling ratios.

关键词： single-pixel imaging binary Fourier basis pattern the dithering algorithm

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Efficient Multi-Stage Network with Pixel-Wise Degradation Prediction for Real-Time Motion Deblurring

SSRN

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SSRN 2022年

作者： Hao, Zeyu Wang, Hang Zhang, Xuchong Li, Yuhai Sun, Hongbin Institute of Artificial Intelligence and Robotics Xi’an Jiaotong University Shaanxi Xi’an710049 China School of Microelectronics Xi’an JiaoTong University Shaanxi Xi’an710049 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China

Motion deblurring is an indispensable task in perceptual systems because motion blur can seriously influence the visual effect and the quality of subsequent perception tasks. In practical application, efficiency and effect of motion deblurring are both important. However, among the existing methods, there is no design that can meet the real-time and visual quality requirements at the same time. Thus, an efficient motion deblurring network is proposed by leveraging multi-stage pixel-wise degradation prediction. Specifically, some lightweight modules are designed to accelerate processing while attention and multi-scale mechanism are introduced to maintain quality. In addition, a pixel-wise degradation prediction module and a spatial-channel compensation module are further employed to improve the deblurring quality, such as the distortion of moving objects in the restoration images. Extensive experimental results show that the proposed network can achieve the same PSNR level as the SOTA lightweight deblurring methods and is far faster (5.3 times for DMPHN, 6.7 times for IFI-RNN). Therefore, the proposed design achieves a balance between quality and speed compared with the existing methods. © 2022, The Authors. All rights reserved.

关键词： Pixels

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Research on Space-Time Block Code technology in MIMO System

Research on Space-Time Block Code Technology in MIMO System

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International Conference on Computer and Communications (ICCC)

作者： Conglin Pan Si Chen Wei Wu Jiachuan Qian Lijun Wang Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of CETC Jiaxing China School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing China

ISBN: (纸本)9781665409513

MIMO technology has been widely used in the telecommunication systems nowadays, and the space-time coding is a key part of MIMO technology. A good coding scheme can exploit the spatial diversity to correct the error which is generated in transmission, and increase the normalized transfer rate with low decoding complexity. On the Basis of the research on different Space-Time Block Codes, this essay proposes a new STBC, Diagonal Block Orthogonal Space-Time Block Code. Then we will compare it with other STBCs in the performance of bit error rate, transfer rate, decoding complexity and peek-to-average power ratio, the final result will prove the superiority of DBOAST.

关键词： Spatial diversity Bit error rate Encoding Decoding Complexity theory Telecommunications Block codes

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SFNet: Stage Spatial Attention and Feature Waterfall Fusion for Mathematical Document Text Line Detection

SFNet: Stage Spatial Attention and Feature Waterfall Fusion ...

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IEEE International Symposium on Dependable, Autonomic and Secure Computing (DASC)

作者： Chang Liu Jiaxin Liu Yong Zhang Lei Huang University of Electronic Science and Technology of China Chengdu Sichuan China Science and Technology on Electro-Optical Information Security Control LaboratoryTianjinChina300308 China Sichuan College of Architectural Technology Deyang Sichuan China

ISBN: (纸本)9781665421751

Text line detection is an important technique in layout analysis. Due to the existence of non-text areas and the change of formula height, text line detection in mathematical documents has always been a huge challenge. In view of the complexity of the spatial structure of mathematical text lines, on the one hand, based on the existing attention mechanism, we proposed a composite network structure with Stage Spatial Attention, which has better feature extraction. In addition, a multi-scale feature fusion structure, called Feature Waterfall Fusion, adds features with low-resolution but stronger semantic information into the features with high-resolution but weaker semantic information indirectly and directly. Combining them results in SFNet. On the other hand, to explore the mathematical document text line detection, we constructed a dataset named Mathematical Document Text Line Dataset (MDTL-1850), which includes about 10,669 text line annotations in 1,850 images (1,280 for training and 570 for testing). We assembled SFNet and a learnable post-processing Progressive Scale Expansion (PSE) surpassed mainstream text detection networks such as PSENet and PANet in all metrics on MDTL-1850. Precision $(P)$ , Recall $(R)$ and $F_information$ , which improved by 1.0, 0.7 and 0.9 respectively. The experimental results strongly proved the superiority of SFNet network in detecting text line of mathematical documents.

关键词： Training Measurement Semantics Layout Feature extraction Software Robustness

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Metasurfaces with high-Q resonances governed by topological edge state

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Optics letters 2022年第7期47卷 1822-1825页

作者： Zhidong Gu Jiaxin Chen Bofeng Gao Wei Wu Zhenyu Zhao Wei Cai Xinzheng Zhang Mengxin Ren Jingjun Xu The Key Laboratory of Weak-Light Nonlinear Photonics Ministry of Education School of Physics and TEDA Applied Physics Institute Nankai University Tianjin 300071 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300308 China Department of Physics Shanghai Normal University Shanghai 200234 China e-mail: weicai@*** e-mail: jjxu@***

Achieving high-quality (Q)-factor resonances in metasurfaces is essential for various applications, including nano-lasers, nonlinear optics, and quantum optics. In this work, we propose a high-Q metasurface using a topological strategy: constructing the metasurface by stacking two conjugated nanopillar arrays with different topological invariants. Our study shows that a topological edge state steadily appears at the interfaces of the nanopillars, and a sharp transmission resonance with a Q-factor of more than 1000 can be obtained. The sensing application of such high-Q topological metasurface is also demonstrated, whose figure of merit reaches approximately 145. The proposed strategy and underlying theory can open up new avenues to realize ultrasharp resonances, which can promote numerous potential applications, such as biosensing, optical modulation, and slow-light devices.

关键词： electromagnetically induced transparency Nonlinear optics optical systems Quantum optics Refractive index Resonance

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Weapon Target Assignment for Surface-to-air Defense with an Improved Reinforcement Genetic Algorithm

Weapon Target Assignment for Surface-to-air Defense with an ...

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Chinese Automation Congress (CAC)

作者： Hua Gong Dalong Liu Yong Zhang Ke Xu School of Science Shenyang Ligong University Shenyang China School of Automation and Electrical Engineering Shenyang Ligong University Shenyang China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin China

ISBN: (纸本)9781665426480

Decision optimization in surface-to-air defense and coordinated weapon target assignment can improve the defense effect and the utilization rate of weapons. Considering the constraints of weapon capability, a multi-target optimization model is established to maximize the damage probability and minimize the weapon consumption cost. A dual population genetic algorithm improved by reinforcement learning is designed to solve this model. The chromosome exchange ratio is controlled by reinforcement learning to ensure population diversity. Experimental results verify the convergence speed and accuracy of the improved reinforcement genetic algorithm.

关键词： Costs Weapons Heuristic algorithms Sociology Reinforcement learning Statistics Optimization

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Ground-to-air-Defense Firepower Assignment Decision Based on Non-cooperative Game

Ground-to-air-Defense Firepower Assignment Decision Based on...

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Chinese Automation Congress (CAC)

作者： Hua Gong Mengya Cui Yong Zhang Wenjuan Sun School of Science Shenyang Ligong University Shenyang China School of Automation and Electrical Engineering Shenyang Ligong University Shenyang China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin China

ISBN: (纸本)9781665426480

The key problem of ground-to-air defense is how to make accurate and effective firepower assignment decision for attacking targets. A multi-objective optimization model of ground-to-air defense firepower assignment is established with the aim of maximizing the damage probability and minimizing the weapon consumption, and non-cooperative game theory is used to solve the problem. A non-cooperative game model is established by mapping the two objectives to players, and weapon assignment schemes to strategy profiles. An improved tabu genetic algorithm based on Nash equilibrium is designed to get the assignment scheme. Experimental results show that the proposed method has better convergence and stability than the improved genetic algorithm based on tabu search for multi-objective optimization model.

关键词： Automation Weapons Games Nash equilibrium Search problems Minimization Stability analysis

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