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2nd IEEE International Conference on Signal, information and Data Processing, ICSIDP 2024

作者： Li, Renjie Hu, Zijun Tian, Dezhi He, Pufeng Liang, Zhennan Liu, Quanhua Beijing Institute of Technology Key Laboratory of Electronic and Information Technology in Satellite Navigation Beijing China Intelligent Science and Technology Academy Casic Beijing China Chongqing Innovation Center Beijing Institute of Technology Chongqing China

ISBN: (纸本)9798331515669

With the advancement of deception jamming and multi-radar cooperative anti-jamming technologies, multi-radar systems designed to counter multiple jammers have become a research hotspot, with jamming recognition being a critical step. In recent years, deep learning has been successfully applied to radar jamming recognition, where the jamming signal is transformed into a time-frequency map and subsequently treated as an image recognition problem. However, the performance of jamming recognition algorithms deteriorates significantly when multiple jamming signals overlap in the time-frequency domain. To address this issue, this paper proposes a distributed radar multi-jamming recognition method based on a Transformer network. This method employs adaptive beamforming to separate jamming echoes in the spatial domain, and then converts the jamming echoes from each radar node into time-frequency spectrograms using the short-time Fourier transform. These spectrograms are then input into the Transformer network to detect the type of jamming and estimate jamming parameters based on their relative positions in the time-frequency spectrograms. Finally, the multi-node processing results are fused to output the jamming type and the corresponding fused jamming parameters. Simulation experiments verify the effectiveness of the proposed algorithm. © 2024 IEEE.

关键词： Frequency domain analysis

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Experiment on protection performance of plasma array to 6GHz high-power microwave

Experiment on protection performance of plasma array to 6GHz...

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2023 Advanced Fiber Laser Conference, AFL 2023

作者： Liu, Yang Lv, Shouye Li, Jinzhou Meng, Gang Liao, Shuai Shi, Jiaming Satellite Information Intelligent Processing and Application Research Laboratory Beijing Institute of Remote Sensing Information Beijing100192 China State Key Laboratory of Pulsed Power Laser Technology National University of Defense Technology Hefei230037 China

ISBN: (纸本)9781510677661

For purpose of the electromagnetic pulse (EMP) protection research, a double-layer barrier of cylindrical plasma array was designed, and its protective performance to 6GHz high-power microwave (HPM) was conducted experimentally. Combining the distribution of the discharge plasma array, the shielding effectiveness of the double-layer plasma on 6GHz HPM pulse was studied. The main research contents and conclusions are as follows: The transmission energy of HPM decreased as the increase of plasma electron density, indicating an improved protection effect, with both double-layer and single-layer plasma array. Besides, the results showed that the transmission attenuation of HPM in double-layer structure was greater than that in single-layer structure because of the interlayer reflection. In addition, an interesting phenomenon was discovered during the experiment, which was that the boundary plasma units had a significant impact on the HPM transmission. The shielding effect of HPM was better with opening seven plasma units than that with opening whole plasma array. Finally, the spectral characteristics and transmission coefficients of the HPM were presented by Fourier transform, and the results of the protective performance were consistent with the above-mentioned time-domain analysis. The experiment results in this paper are of great significance in protecting against HPM based on plasma. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Carrier concentration

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Focus on sub-nanometer measurement accuracy:distortion and reconstruction of dynamic displacement in a fiber-optic microprobe sensor

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Light(Advanced Manufacturing) 2024年第4期5卷 121-135页

作者： Yisi Dong Wenrui Luo Wenwen Li Chen Zhang Pengcheng Hu Haijin Fu Hongxing Yang Ruitao Yang Yongkang Dong Jiubin Tan Center of Ultra-precision Optoelectronic Instrument Harbin Institute of TechnologyHarbin 150080China Key Lab of Ultra-precision Intelligent Instrumentation(Harbin Institute of Technology) Ministry of Industry and Information TechnologyHarbin 150080China National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of TechnologyHarbin 150001China

We established a complete model and relationship between laser source characteristics and measurement accuracy of high precision fiber microprobe sensor(FMS)based on phase generated carrier *** laser carried out high-bandwidth frequency modulation to improve the measurement ***,the laser also carried out large-amplitude frequency modulation to eliminate tens of nanometers of nonlinear error,thus improving the measurement ***,the laser center wavelength is required to be stabilized under the above modulation to achieve a high measurement *** conflict between laser frequency modulation and central stability is revealed and analyzed alongside the distortion of measurement accuracy.A modified frequency stabilization method for laser source under high-bandwidth and large-amplitude modulation is proposed for improving measurement accuracy to realize sub-nanometer *** experimental results showed that when the modulation bandwidth was 1 MHz and maximum modulation amplitude was 2.61 GHz,the distributed feedback laser central wavelength stability was 2.9×10^(−10)(τ=1s)according to Allan ***,the relative expanded uncertainty of the laser wavelength was demonstrated to be superior to 5×10^(−8)(k=2)within 3 hr,which was at least one order of magnitude higher than that of the traditional *** resolution and stability of FMS is better than 0.4 nm,and the nonlinear error is reduced from tens of nm to 0.8 nm,which meets the requirements of sub-nanometer measurements.

关键词： Displacement measurement Fiber microprobe sensor High-bandwidth and large-amplitude frequency modulation Central wavelength stability Sub-nanometer measurements

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Phase unwrapping method for 3D measurement based on multi-frequency asynchronous phase shift 2

Phase unwrapping method for 3D measurement based on multi-fr...

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2nd International Conference on Electronic information Engineering and Computer Communication, EIECC 2022

作者： Cao, Chunyang Deng, Chengzhi Wu, Zhaoming Zhang, Xiaoxiao Hu, Cheng Jiangxi Province Key laboratory of Water Information Cooperative Sensing and Intelligent Processing School of Information Engineering Nanchang Institute of Technology 330099 China

ISBN: (纸本)9781510663121

Aiming at the problems that 3D optical measurement is easy to be affected by peripheral noise, difficult to calculate relative height and low measurement accuracy, a multi-frequency asynchronous phase shift algorithm based on time series changes was proposed. In order to improve the measurement accuracy and anti-interference ability of the system, five kinds of frequency grating projections were adopted. In order to improve the efficiency of phase undoing, the asynchronous phase shift method was used to extract the phase principal value. In view of the multi-frequency heterodyne phase solution method is prone to produce phase jump error, a phase jump error correction method based on threshold discrimination is proposed. The experimental results show that the improved algorithm has better measurement accuracy than the original algorithm, and compared with the traditional multi-frequency heterodyne method, it has strong anti-interference ability and higher measurement accuracy. © 2023 SPIE.

关键词： Error correction

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Network intrusion detection method based on CAE-ResNet-BiLSTM 4

Network intrusion detection method based on CAE-ResNet-BiLST...

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4th International Conference on Advanced Algorithms and Neural Networks, AANN 2024

作者： Yansong, Liu Pin, Wang College of Computer Science and Technology Shenyang University of Chemical Technology Liaoning Key Laboratory of Intelligent Technology for Chemical Process Industry Shenyang110142 China Shenyang Institute of computing technology Chinese academy of sciences China

ISBN: (纸本)9781510686106

To address the issue of low detection accuracy in existing network intrusion detection technologies caused by insufficient learning of data feature information, this paper proposes a network intrusion detection model based on Convolutional Autoencoder (CAE), Residual Network (ResNet), and Bidirectional Long Short-Term Memory (BiLSTM) networks. This method first performs preliminary feature extraction using a CAE, then enhances feature processing capabilities with ResNet, and finally captures time series information with BiLSTM. Classification is carried out through a fully connected layer and an output layer. The validation results on the NSL-KDD dataset and UNSW-NB15 dataset show that the model achieved accuracy rates of 99.34% and 82.47%, with false positive rates of 0.376% and 6.088%, respectively. The experimental results indicate that the proposed model effectively addresses issues such as low detection accuracy caused by insufficient learning of data feature information. © 2024 SPIE.

关键词： Network intrusion

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Sliding Mode Control of Overhead Crane Based on RBF Neural Network 5

Sliding Mode Control of Overhead Crane Based on RBF Neural N...

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5th IEEE International Conference on Power, intelligent computing and Systems, ICPICS 2023

作者： Li, Xinqi Zhang, Yongli Shi, Lanting Pang, Dangfeng Tianjin University of Technology and Education Tianjin Key Laboratory of Information Sensing and Intelligent Control Tianjin China School of Information Technology Beijing Institute of Technology Zhuhai Zhuhai China

ISBN: (纸本)9798350333442

Aiming at the problems of trolley positioning and load anti-swing of bridge crane, the controller was designed in the framework of sliding mode control, and RBF neural network was introduced to solve the uncertainty of the bridge crane model. The stability of the designed control system was determined by using LaSalle invariance theorem. The simulation experiments of the controller were realized with MATLAB software. The experimental results shown that the presented control method can realize the rapid positioning of trolley and bridge and the load anti-swing, and has a good control effect. © 2023 IEEE.

关键词： Sliding mode control

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A Conformal AMC-Backed Array of Moderate Gain, Broad Coverage and Wide Bandwidth 12

A Conformal AMC-Backed Array of Moderate Gain, Broad Coverag...

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12th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2024

作者： Ding, Chuanfei Gao, Xiang Liu, Heng Bu, Xiangyuan An, Jianping Beijing Institute of Technology School of Information and Electronics Beijing100081 China Beijing Institute of Technology School of Cyberspace Science and Technology Beijing100081 China National Key Laboratory of Science and Technology on Space-Born Intelligent Information Processing Beijing100081 China

ISBN: (纸本)9798350351019

This paper presents a conformal array antenna for emergency communication applications. The array consists of six conformal AMC-backed Yagi antennas, for which approximately half-space beam coverage can be achieved via one-dimensional full-azimuthal beam switching. The Yagi antenna is comprised of a bowtie-shaped driven dipole and three directors with optimized lengths and spacing to achieve the desired radiation characteristics. To increase the gain and generate the oblique directional beam, the Yagi antenna is backed by an AMC reflector. To validate the design, a prototype of conformal array element was fabricated and measured. Experimental results have shown the proposed conformal antenna exhibit a bandwidth of 570 MHz at the 2.4-GHz band, a gain of 7.5 dBi and approximately half-space beam coverage. The superior performance has shown its huge potential in balloon-based emergency communication stations. © 2024 IEEE.

关键词： Microwave antennas

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Acute Observational Stimulus of Restrained Mice Induced Anxiolytic Effects in Observer Mice

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Neuroscience Bulletin 2024年第10期40卷 1545-1550页

作者： Chun-Hui Jia Fang-Qi Shu Pak-Ming Lau Hao Wang CAS Key Laboratory of Brain Function and Disease Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230026China Anhui Province Key Laboratory of Biomedical Imaging and Intelligent Processing Institute of Artificial IntelligenceHefei Comprehensive National Science CenterHefei 230088China Interdisciplinary Center for Brain Information The Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China National Engineering Laboratory for Brain-inspired Intelligence Technology and Application School of Information Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026China

Dear Editor,Ensuring an appropriate response to external stimuli is essential for animals'survival and *** indicates that such stimuli can affect animals'physiological state and hormone levels,including corticosterone(CORT)[1,2].The impact of these stimuli on animals'performance depends on their density and duration,as they can either facilitate or hinder *** chronic and intense stressors can have detrimental effects on animals'physiological health and behavioral performance,leading to psychiatric disorders such as depression,anxiety,and schizophrenia[3],the effects of acute and mild observational stimuli are still unclear.

关键词： evolution. Observation acute

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AlphaFold2 and its applications in the fields of biology and medicine

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Signal Transduction and Targeted Therapy 2023年第4期8卷 1630-1643页

作者： Zhenyu Yang Xiaoxi Zeng Yi Zhao Runsheng Chen West China Biomedical Big Data Center West China HospitalSichuan UniversityChengdu 610041China Key Laboratory of Intelligent Information Processing Advanced Computer Research CenterInstitute of Computing TechnologyChinese Academy of SciencesBeijing 100190China Key Laboratory of RNA Biology Center for Big Data Research in HealthInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China Pingshan Translational Medicine Center Shenzhen Bay LaboratoryShenzhen 518118China

AlphaFold2(AF2)is an artificial intelligence(AI)system developed by DeepMind that can predict three-dimensional(3D)structures of proteins from amino acid sequences with atomic-level *** structure prediction is one of the most challenging problems in computational biology and chemistry,and has puzzled scientists for 50 *** advent of AF2 presents an unprecedented progress in protein structure prediction and has attracted much *** release of structures of more than 200 million proteins predicted by AF2 further aroused great enthusiasm in the science community,especially in the fields of biology and ***2 is thought to have a significant impact on structural biology and research areas that need protein structure information,such as drug discovery,protein design,prediction of protein function,et *** the time is not long since AF2 was developed,there are already quite a few application studies of AF2 in the fields of biology and medicine,with many of them having preliminarily proved the potential of *** better understand AF2 and promote its applications,we will in this article summarize the principle and system architecture of AF2 as well as the recipe of its success,and particularly focus on reviewing its applications in the fields of biology and *** of current AF2 prediction will also be discussed.

关键词： system fields Fold

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Linear magnetoresistance and structural distortion in layered SrCu_(4-x)P_(2) single crystals

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Chinese Physics B 2024年第1期33卷 591-594页

作者：聂勇陈正韦文森李慧杰张勇梅明王园园宋文海宋东升王钊胜朱相德宁伟田明亮 Anhui Key Laboratory of Low-energy Quantum Materials and Devices High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Department of Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China School of Physics Anhui UniversityHefei 230601China

We report a systematic study on layered metal SrCu_(4-x)P_(2) single crystals via transport, magnetization, thermodynamic measurements and structural characterization. We find that the crystals show large linear magnetoresistance without any sign of saturation with a magnetic field up to 30T. We also observe a phase transition with significant anomalies in resistivity and heat capacity at T_(p)~140 K. Thermal expansion measurement reveals a subtle lattice parameter variation near Tp, i.e.,?L_(c)/L_(c)~0.062%. The structural characterization confines that there is no structure transition below and above T_(p). All these results suggest that the nonmagnetic transition of SrCu_(4-x)P_(2) could be associated with structural distortion.

关键词： linear magnetoresistance thermal expansion specific heat structural distortion

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