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6th IEEE Information technology, Networking, Electronic and Automation control Conference, ITNEC 2023

作者： Pang, Bo Fu, Yongquan Ren, Siyuan Jia, Yan Harbin Institute of Technology College of Computer Science and Technology Shenzhen China National University of Defense Technology National Key Laboratory for Parallel and Distributed Processing College of Computer Changsha China Peng Cheng Laboratory Shen Zhen China

ISBN: (纸本)9781665460033

Network traffic classification is crucial for network security and network management and is one of the most important network tasks. Current state-of-the-art traffic classifiers are based on deep learning models to automatically extract features from packet streams. Unfortunately, current approaches fail to effectively combine the structural information of traffic packets with the content features of the packets, resulting in limited classification accuracy. In this paper, we propose a graph neural network model for network traffic classification, which can well perceive the interaction feature of packets in traffic. Firstly, we design a graph structure for packets' flows to hold the interaction information between packets, which embeds both packet contents and sequence relationships into a unified graph. Secondly, we propose a graph neural network framework for graph classification to automatically learn the structural features of the packets' flows together with the packets' features. Extensive evaluation results on real-world traffic data show that the proposed model improves the prediction accuracy of improves the prediction accuracy by 2% to 37% for malicious traffic classification. © 2023 IEEE.

关键词： Graph neural networks

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Design and Simulation Experiment of a New Magnetron Sputtering Cathode Surface Magnetic Field Structure 7

Design and Simulation Experiment of a New Magnetron Sputteri...

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7th IEEE International Electrical and Energy Conference, CIEEC 2024

作者： Junnru, Wang Yongke, Wang Yu, Yaowei Zongsheng, Chen Zhigang, Li Yahui, Wang Xiangyin, Lv Jiao, Peng College of Electronic Engineering National University of Defense Technology State Key Laboratory of Pulsed Power Laser Technology Hefei230037 China College of Electronic Engineering National University of Defense Technology Anhui Provincial Laboratory of Advanced Laser Technology Hefei230037 China College of Electronic Engineering National University of Defense Technology Infrared and Low Temperature Plasma Key Laboratory of Anhui Province Hefei230037 China Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China West Anhui University Lu'an237012 China

ISBN: (纸本)9798350359558

Magnetron sputtering is widely used in the field of material surface modification of low-temperature plasma, in which the magnetic field design of the cathode directly affects the quality of film formation and process cost. In order to optimize the magnetic field of the existing magnetron sputtering target, a structure with alternate distribution of internal and external magnetic yokes and permanent magnets is designed, and the finite element simulation experiment is carried out by using the method of parameter control variables. By studying the influence of magnetic circuit structure parameters on the magnetic field strength and distribution uniformity of the target surface, the parameters of key components such as permanent magnets and magnetic yokes were optimized and determined. The simulation results show that with the design structure of the cathode, the uniformity of the horizontal magnetic induction intensity on the surface of the cathode is 49.4% and the target utilization rate is 50.3%, which effectively improves the magnetic field uniformity and target utilization. © 2024 IEEE.

关键词： Cathodes

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A Multi-Agent Routing Algorithm with Trajectory Prediction for Highly Dynamic UAV Networks 22

A Multi-Agent Routing Algorithm with Trajectory Prediction f...

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22nd International Conference on Optical Communications and Networks, ICOCN 2024

作者： Zhao, Ziyi Zhang, Qi Li, Yuanfeng Xin, Xiangjun Ma, Jianxin Sun, Meng Zhao, Yi Chai, Furong Tian, Feng Wang, Fu Tian, Qinghua Wang, Yongjun Beijing100876 China BUPT Beijing Key Laboratory of Space-ground Interconnection and Convergence Beijing100876 China National University of Defense Technology Science and Technology on Information Systems Engineering Laboratory Changsha410073 China School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Institute of Control and Electronic Technology Beijing100038 China

To address the routing problems in high-dynamic UAV networks, a multi-agent routing algorithm with trajectory prediction is proposed. Simulations show the proposed algorithm can achieve better performance on the end-t... 详细信息

ISBN: (纸本)9798350367652

关键词： Unmanned aerial vehicles (UAV)

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A Survey on Unmanned Aerial Vehicle Swarm Communication and Navigation

A Survey on Unmanned Aerial Vehicle Swarm Communication and ...

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International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Lv, Chubing Yu, Ruihang Cao, Juliang Gong, Chen Wu, Wenqi Wang, Xueying College of Intelligence Science and Technology National University of Defense Technology Changsha410073 China Key Laboratory of Wireless-Optical Communications Chinese Academy of Sciences School of Information Science and Technology University of Science and Technology of China Hefei230052 China

ISBN: (纸本)9789811966125

Due to the advantages of quick response, low cost, and flexible deployment, unmanned aerial vehicle swarms have broad application prospects in the military and civilian fields. Compared with single aircraft, the swarms have the advantages of robustness, scalability and information interaction. The safety of unmanned aerial vehicle swarms is crucial to perform the flight mission successfully for the system. When performing tasks, communication and navigation technologies provide basic guarantees for cluster collaboration. This paper introduces the research status and development trend of unmanned aerial vehicle swarm communication and navigation technology. Two typical unmanned aerial vehicle swarm wireless communication architectures are introduced. Most systems still utilizes ground stations to control unmanned aerial vehicle swarms directly, called infrastructure-based swarm architecture. On the contrary, this paper mainly introduces swarm architecture based on Ad-hoc network, and points out its development direction. As satellite navigation signal easily suffer from interference, several new autonomous navigation technologies which do not rely on satellite navigation are introduced, including bionic navigation, visual-inertial integrated navigation, and cooperative navigation. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Antennas

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A Fast Heterogeneous Image Registration Method Based on the Human Skeleton Points 7

A Fast Heterogeneous Image Registration Method Based on the ...

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7th International Conference on Image, Vision and Computing, ICIVC 2022

作者： Wan, Duo Xiao, Shanzhu College of Electronic Science and Technology National University of Defense Technology National Key Laboratory of Science and Technology on Automatic Target Recognition Changsha410073 China

ISBN: (数字)9781665467346

ISBN: (纸本)9781665467346

Visible-infrared composite cameras are widely used in public health monitoring and intelligent security. Fast and accurate registration of visible-infrared images is the key to the further application of the information in different spectra. In the crowd scenario, aiming at the problem of poor consistency of traditional feature points such as corners, spots, and contour points in the two types of images, this paper proposes an effective method of heterogeneous image registration based on human skeleton points. Firstly, the human skeleton points are detected by a multi-person pose estimation network, which represents the common features of visible and infrared images decently. Then, the key points are matched by a top-down method that integrates the spatial information of point groups with the type of each point. Finally, the point pairs are put into the control points buffer and the transformational matrix is calculated. We capture and make a visible-infrared image sequence dataset in a crowd-oriented scene, and conduct qualitative and quantitative tests on it. The experiments show that the designed method outperforms traditional registration algorithms both in terms of accuracy and processing speed. © 2022 IEEE.

关键词： Image registration

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Impact of orbit determination methods on the characteristics of LEO satellites clock bias

Impact of orbit determination methods on the characteristics...

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2024 International Workshop on Automation, control, and Communication Engineering, IWACCE 2024

作者： Chen, Xi Gong, Hang Ma, Ming Peng, Jing Li, Zongnan Sun, Guangfu Chen, Meng Guo, Lei College of Electronic Science and Technology National University of Defense Technology Changsha410073 China Key Laboratory of Satellite Navigation Technology Changsha410073 China China Satellite Network System Co. Ltd Beijing100144 China

ISBN: (数字)9781510685420

ISBN: (纸本)9781510685413

On-board orbit determination and timing are the most convenient ways for low earth orbit (LEO) constellations to achieve spatiotemporal datum, but different calculation methods lead to different error coupling methods, and there is a lack of research on the impact of orbit determination methods on the characteristics of LEO clock bias. Therefore, this article is mainly based on the publicly measured data of 7 LEO satellites in orbit, including gravity recovery and climate experiment follow-on (GRACE-FO), sentinel-3, and swarm, combined with indicators such as accuracy, frequency stability and period term to comprehensively evaluate the impact of different orbit determination methods on the LEO clock bias characteristics. The results show that the clock bias calculated from reduced dynamic are smoother and less gross compared to kinematic, and the stability of clock bias obtained by reduced dynamic is higher based on better onboard clocks and observations. However, two orbit determination methods have no significant impact on the accuracy and periodic term of clock bias. Meanwhile, under the same orbit determination method, the GRACE-FO clock has the highest accuracy, better than 1ns, reach E-13 level for 100s and E-14 for 1000s stability, slightly better than BeiDou-2 rubidium clock, equivalent to Beidou-3 rubidium clock and inferior to BeiDou-3 Passive Hydrogen Maser clock. Next is sentinel-3, the worst is swarm, and the clock bias of sentinel-3 and swarm have obvious periodic characteristics. © 2024 SPIE. All rights reserved.

关键词： Frequency stability

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Erratum to:A nonlinear wake model of a wind turbine considering the yaw wake steering

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Journal of Oceanology and Limnology 2024年第3期42卷 1016-1017页

作者： Yunzhou LI Zhiteng GAO Shoutu LI Suiping QI Xiaoyu TANG College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Multi-function Towing Tank School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Energy and Power Engineering Lanzhou University of TechnologyLanzhou 730050China Institute of Oceanographic Instrumentation Qilu University of Technology(Shandong Academy of Sciences)Qingdao 266061China State Key Laboratory of Industrial Control Technology College of Control Science and EngineeringZhejiang UniversityHangzhou 310027China Laoshan Laboratory Qingdao 266237China

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Fault-Tolerant control for Electromagnetic Suspension System of Maglev Train: Comprehensive Research and Design 13

Fault-Tolerant Control for Electromagnetic Suspension System...

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13th IEEE Data Driven control and Learning Systems Conference, DDCLS 2024

作者： Liu, Junhao Dai, Chunhui Sun, Shangrongxi Wang, Hao Li, Xiaolong College of Intelligence Science and Technology National University of Defense Technology Hunan Changsha410073 China Hunan Provincial Key Laboratory of Electromagnetic Levitation and Propulsion Technology Hunan Changsha410073 China Northwest Institute of Electromechanical Technology Shanxi Xian712099 China

ISBN: (纸本)9798350361674

Maglev technology, as an advanced transit technology, have garnered global attention due to their remarkable high-speed performance, energy efficiency, environmental friendliness, and comfortable ride experience. They have been actively promoted and put into practical operation in numerous countries and regions worldwide. Given the complexity of magnetic levitation train systems and their sensitivity to external disturbances, enhancing their reliability and robust stability is of paramount importance. This paper takes the conventional electromagnetic suspension (EMS) maglev train developed by the national University of defense technology as a reference model, and systematically investigates the fault-tolerant control techniques for magnetic levitation trains based on accurate sensor fault detection and localization. The study encompasses the implementation of active fault tolerance through dynamic switching control strategies and sensor failures, as well as simultaneous passive fault-tolerant control schemes that exploit the inherent redundancy characteristics of the joining-structure within the magnetic levitation train system. Furthermore, the effectiveness and practicability of these fault-tolerant control methods were validated using a Digital Signal Processor (DSP) digital controller. The experimental results demonstrated that the summarized fault-tolerant control system meets the predefined performance criteria, thereby substantiating the validity and practicality of the relevant fault-tolerance control technologies. © 2024 IEEE.

关键词： Magnetic levitation

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Interference Suppression and Jitter Elimination Ability-Based Adaption Tracking Guidance for Robotic Fishes

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IEEE/CAA Journal of Automatica Sinica 2025年第1期12卷 126-137页

作者： Dongfang Li Jie Huang Rob Law Xin Xu Limin Zhu Edmond Q.Wu IEEE the School of Electrical Engineering and Automation Fuzhou University the Key Laboratory of System Control and Information Processing Ministry of Education the School of Electrical Engineering and Automation Fuzhou University 5G+Industrial Internet Institute Fuzhou University the University of Macau the College of Mechatronics and Automation National University of Defense Technology the School of Mechanical Engineering Shanghai Jiao Tong University the Department of Computer Science and Engineering Shanghai Jiao Tong University

This work presents an adaptive tracking guidance method for robotic fishes. The scheme enables robots to suppress external interference and eliminate motion jitter. An adaptive integral surge line-of-sight guidance rule is designed to eliminate dynamics interference and sideslip issues. Limited-time yaw and surge speed observers are reported to fit disturbance variables in the model. The approximation values can compensate for the system's control input and improve the robots' tracking ***, this work develops a terminal sliding mode controller and third-order differential processor to determine the rotational torque and reduce the robots' run jitter. Then, Lyapunov's theory proves the uniform ultimate boundedness of the proposed method. Simulation and physical experiments confirm that the technology improves the tracking error convergence speed and stability of robotic fishes.

关键词： Adaptive integral surge line-of-sight approximation robotic fish speed observer

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Numerical simulation of the effect of Faraday cage on the inductively coupled plasma discharge

Numerical simulation of the effect of Faraday cage on the in...

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2024 International Conference on Aerospace, Mechanical and Materials Engineering, AMME 2024

作者： Lei, Fan Zhang, Zhaoyang Wei, Xiaolong Han, Xinmin Wu, Hongzhi Liu, Zhiwei School of Electrical and Control Engineering Shaanxi University of Science and Technology Xi'an710016 China National Defense Key Laboratory of Aeronautical Plasma Dynamics Air Force Engineering University Xi'an710038 China China Academy of Aerospace Science and Innovation Beijing100032 China

Taking inductively coupled plasma (ICP) as the research object, a method of increasing the electron density of ICP by Faraday cage electromagnetic shielding is proposed. At the same time, the introduction of the Faraday cage can effectively prevent the electromagnetic interference caused by the discharge coil, which is helpful in reproducing the real near-space plasma environment in the laboratory. Based on COMSOL Multiphysics, a two-dimensional inductively coupled plasma discharge model was constructed, and the effect of the Faraday cage on ICP discharge parameters was comparatively studied. The simulation results show that the Faraday cage can effectively shield the electromagnetic interference caused by the discharge coil. At the same time, the Faraday cage can increase the electron density and the electron temperature of the plasma to a certain extent, and the plasma is evenly distributed in this case. With the increase of discharge power, the electromagnetic shielding effect of the Faraday cage is still effective, and the effect on the plasma electron density is more obvious. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Inductively coupled plasma

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