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SSRN 2024年

作者： Liu, Wenbo Kuang, Zhian Zhang, Yongcong Zhou, Bo Li, Shihua School of Automation Southeast University Nanjing210096 China Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Nanjing210096 China Shanghai Friendess Electronic Technology Shanghai201100 China

In this article, the complicated task assignment, scheduling and planning of heterogeneous multi-robot welding process are studied. Firstly, for large-scaled tasks that involve heterogeneous multi-robot task allocation under different internal and external constraints, the traditional multi-robot task allocation (MRTA) framework is extended to a novel and unified heterogeneous multi-robot task allocation (H MRTA)***,robotsofdifferentconfigurations (including manipulators, positioners, gantries) are treated as unified robots. Secondly, taking into account constraints such as reachability, collision avoidance, kinematic and dynamic process constraints, the optimization model based on H-MRTA framework is established. The optimization objectives are formulated by combining the total execution time and load balance between robots. Then, a hierarchical optimization algorithm(TCO-HMRTA) is proposed to solve the H-MRTA problem with decoupled two-layer optimization sub-problems : task space segmentation subproblem and multi-robot path planning subproblem. For the task space segmentation subproblem, a task-centered optimization model is established, which aims to balance the workload among robots, considering the competition and cooperation between robots. For the multi-robot path planning problem, multiple process constraints are considered and the total working time is minimized as the objective function. Finally, The effectiveness of the optimization algorithm is verified by a case study on the welding task of a large plate element in a ship hull. Compared to two other state-of-the-art algorithms, TCO-HMRTA can save more than 50% of the waiting time and 10%-20% of the execution time, which demonstrates the effectiveness and feasibility of the hierarchical optimization-based task allocation algorithm for complicated heterogeneous multi-robots. © 2024, The Authors. All rights reserved.

关键词： Industrial robots

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A CROSS-CAMERA PEDESTRIAN TRAJECTORY TRACKING METHOD IN SHOPPING MALL ENVIRONMENT

A CROSS-CAMERA PEDESTRIAN TRAJECTORY TRACKING METHOD IN SHOP...

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2022 Jiangsu Annual Conference on Automation, JACA 2022

作者： Cao, Zhan Niu, Dan Gong, Hao Shi, Chunlei Zhang, Guangpei Yang, Yanlan Southeast University Suzhou215123 China School of Automation Southeast University Nanjing210096 China Key Laboratory of Measurement and Control of CSE Ministry of Education Research Laboratory China Vision Technology Co. Ltd. Shanghai200020 China

ISBN: (纸本)9781839538476

Pedestrian trajectory in the shopping mall environment plays an important role in criminal investigation, passenger flow statistics, big data recommendation and many other fields. In this paper, a pedestrian trajectory tracking method is proposed, which is based on artificial intelligence algorithms. The method is composed of three modules. First, YoloX is applied to detect pedestrians;secondly, the BYTE algorithm is applied to track pedestrians;finally, the FastReID network and matching algorithms are applied to identify pedestrians. In addition, we also use the BrainFrame platform to package and deploy the algorithm. Experiments show that this method can effectively perform person re-identification tasks with low performance requirements, thus contribute to pedestrian trajectory tracking task in shopping mall environment. Copyright© JACA 2022 All rights reserved.

关键词： Object detection

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Viral Tools for Neural Circuit Tracing

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Neuroscience Bulletin 2022年第12期38卷 1508-1518页

作者： Qing Liu Yang Wu Huadong Wang Fan Jia Fuqiang Xu The Brain Cognition and Brain Disease Institute(BCBDI) Shenzhen Key Laboratory of Viral Vectors for BiomedicineShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsNMPA Key Laboratory for Research and Evaluation of Viral Vector Technology in Cell and Gene Therapy Medicinal ProductsShenzhen Key Laboratory of Quality Control Technology for Virus-Based TherapeuticsGuangdong Provincial Medical Products AdministrationShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Key Laboratory of Magnetic Resonance in Biological SystemsWuhan Center for Magnetic ResonanceInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China Center for Excellence in Brain Science and Intelligence Technology Chinese Academy of SciencesShanghai 200031China University of Chinese Academy of Sciences Beijing 100049China

Neural circuits provide an anatomical basis for functional ***,dissecting the structure of neural circuits is essential to understanding how the brain *** neurotropic viruses are important tools for neural circuit tracing with many advantages over non-viral tracers:they allow for anterograde,retrograde,and trans-synaptic delivery of tracers in a cell type-specific,circuit-selective *** this review,we summarize the recent developments in the viral tools for neural circuit tracing,discuss the key principles of using viral tools in neuroscience research,and highlight innovations for developing and optimizing viral tools for neural circuit tracing across diverse animal species,including nonhuman primates.

关键词： Neural circuit Viral tool Anterograde Retrograde Trans-synaptic

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Wide-spectrum optical synthetic aperture imaging via spatial intensity interferometry

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Opto-Electronic Advances 2023年第12期6卷 27-35页

作者： Chunyan Chu Zhentao Liu Mingliang Chen Xuehui Shao Guohai Situ Yuejin Zhao Shensheng Han Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology Beijing 100081China School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China National Laboratory of Aerospace Intelligent Control Technology Beijing 100089China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China.

High resolution imaging is achieved using increasingly larger apertures and successively shorter *** aperture synthesis is an important high-resolution imaging technology used in *** long baseline amplitude interferometry is susceptible to uncontrollable phase fluctuations,and the technical difficulty increases rapidly as the wavelength *** intensity interferometry inspired by HBT experiment is essentially insensitive to phase fluctuations,but suffers from a narrow spectral bandwidth which results in a lack of effective *** this study,we propose optical synthetic aperture imaging based on spatial intensity *** not only realizes diffraction-limited optical aperture synthesis in a single shot,but also enables imaging with a wide spectral bandwidth,which greatly improves the optical energy efficiency of intensity *** this method is insensitive to the optical path difference between the *** and experiments present optical aperture synthesis diffraction-limited imaging through spatial intensity interferometry in a 100 nm spectral width of visible light,whose maximum optical path difference between the sub-apertures reaches 69λ.This technique is expected to provide a solution for optical aperture synthesis over kilometer-long baselines at optical wavelengths.

关键词： optical synthetic aperture imaging ghost imaging intensity interferometry

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Fabrication and Performance Investigation of Karma Alloy Thin Film Strain Gauge

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Journal of shanghai Jiaotong university(Science) 2021年第4期26卷 454-462页

作者： LEI Peng ZHANG Congchun PANG Yawen YANG Shengong ZHANG Meiju National Key Laboratory of Science and Technology on Micro/Nano Fabrication Shanghai Jiao Tong UniversityShanghai200240China Department of Micro/Nano Electronics School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai200240China AVIC Beijing Changcheng Aeronautical Measurement and Control Technology Research Institute Beijing100022China

Karma alloy thin film strain gauges were fabricated on alumina substrates by magnetron sputtering. The electrical properties of strain gauges annealed at different temperatures were then tested. The surface morphology and phase structure of the Karma alloy thin films were analyzed using X-ray diffraction and scanning electron microscopy. The effect of the annealing temperature on the performance of the Karma alloy thin film strain gauge was also investigated. As the annealing temperature increased, it was found that the resistivity of the thin films decreased, whereas the temperature coefficient of resistance (TCR) of the thin films increased. A Karma alloy thin film strain gauge was annealed at 200 °C, thereby obtaining a gauge factor of 1.7 and a corresponding TCR of 64.8 × 10−6 K−1. The prepared Karma alloy thin film strain gauge had a lower TCR than other strain gauges at room temperature. This result can provide a reference for the preparation and application of Karma alloy thin film strain gauges in specific scenarios.

关键词： thin film strain gauge Karma alloy magnetron sputtering coefficient of resistance(TCR) gauge factor

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Design and synthesis of three-dimensional hybrid Ruddlesden-Popper nickelate single crystals

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Physical Review Materials 2024年第5期8卷 053401-053401页

作者： Feiyu Li Ning Guo Qiang Zheng Yang Shen Shilei Wang Qihui Cui Chao Liu Shanpeng Wang Xutang Tao Guang-Ming Zhang Junjie Zhang State Key Laboratory of Crystal Materials and Institute of Crystal Materials Jinan Shandong 250100 China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China Key Laboratory of Artificial Structures and Quantum Control School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Frontier Science Center for Quantum Information Beijing 100084 China

The advancement of technologies relies on the discovery of new materials with emerging physical properties that are determined by their crystal structures. Ruddlesden-Popper (R-P) phases with a formula of An+1BnX3n+1 (n=1,2,3,...,∞) are among one of the most widely studied classes of materials due to their electrical, optical, magnetic, and thermal properties as well as their combined multifunctional properties. In R-P phases, intergrowth is well known in the short range; however, no existing compounds have been reported to have different n mixed in bulk single crystals. Here we design a hybrid R-P nickelate La2NiO4·La3Ni2O7 by alternatively stacking bilayers, which is the active structural motif in the high-Tc superconductor La3Ni2O7 and single layers of the antiferromagnetic insulator La2NiO4. We report the successful synthesis of La2NiO4·La3Ni2O7 single crystals, and x-ray diffraction and real-space imaging via scanning transmission electron microscopy (STEM) show that the crystal structure consists of single layers and bilayers of NiO6 octahedral stacking alternatively perpendicular to the ab plane, characterized by the orthorhombic Immm (No. 71) space group. Resistivity measurements indicate a metallic ground state and a peculiar resistivity maximum around 140 K. Density functional theory (DFT+U) calculations corroborate this finding and reveal that both the bilayer and the single layer are metallic and that the single layer becomes paramagnetic metallic due to the charge transfer via LaO layers. The discovery of La2NiO4·La3Ni2O7 opens a door to access a family of three-dimensional hybrid R-P phases with the formula of An+1BnX3n+1·Am+1′Bm′X3m+1′ (n≠m), which potentially host a plethora of emerging physical properties for various applications.

关键词： Metal-insulator transition Single crystal materials Crystal growth Magnetization measurements X-ray diffraction

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A rabies virus-based toolkit for efficient retrograde labeling and monosynaptic tracing

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Neural Regeneration Research 2023年第8期18卷 1827-1833页

作者： Kun-Zhang Lin Lei Li Wen-Yu Ma Xin Yang Zeng-Peng Han Neng-Song Luo Jie Wang Fu-Qiang Xu The Brain Cognition and Brain Disease Institute(BCBDI) Shenzhen Key Laboratory of Viral Vectors for BiomedicineShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsNMPA Key Laboratory for Research and Evaluation of Viral Vector Technology in Cell and Gene Therapy Medicinal ProductsShenzhenKey Laboratory of Quality Control Technology for Virus-Based TherapeuticsGuangdong Provincial Medical Products AdministrationShenzhenGuangdong ProvinceChina State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of Sciences-Wuhan National Laboratory for OptoelectronicsWuhanHubei ProvinceChina University of Chinese Academy of Sciences BeijingChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhanHubei ProvinceChina Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions ShenzhenGuangdong ProvinceChina Center for Excellence in Brain Science and Intelligence Technology Chinese Academy of SciencesShanghaiChina

Analyzing the structure and function of the brain's neural network is critical for identifying the working principles of the brain and the mechanisms of brain *** rabies viral vectors allow for the retrograde labeling of projection neurons and cell type-specific trans-monosynaptic tracing,making these vectors powerful candidates for the dissection of synaptic *** several attenuated rabies viral vectors have been developed,their application in studies of functional networks is hindered by the long preparation cycle and low yield of these *** overcome these limitations,we developed an improved production system for the rapid rescue and preparation of a high-titer CVS-N2c-ΔG *** results showed that the new CVS-N2c-ΔG-based toolkit performed remarkably:(1)N2cG-coated CVS-N2c-ΔG allowed for efficient retrograde access to projection neurons that were unaddressed by rAAV9-Retro,and the efficiency was six times higher than that of rAAV9-Retro;(2)the trans-monosynaptic efficiency of oG-mediated CVS-N2c-ΔG was 2–3 times higher than that of oG-mediated SAD-B19-ΔG;(3)CVS-N2c-ΔG could delivery modified genes for neural activity monitoring,and the time window during which this was maintained was 3 weeks;and(4)CVS-N2c-ΔG could express sufficient recombinases for efficient transgene *** findings demonstrate that new CVS-N2c-ΔG-based toolkit may serve as a versatile tool for structural and functional studies of neural circuits.

关键词： functional studies neural activity neural circuits projection neurons rAAV9-Retro rabies virus recombination retrograde labeling synaptic inputs trans-monosynaptic tracing

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Determination of hyperfine splittings and Landé gJ factors of 5s2S1/2 and 5p2P1/2,3/2 states of Cd+111,113 for microwave frequency standards

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Physical Review A 2022年第1期106卷 012821-012821页

作者： J. Z. Han R. Si H. R. Qin N. C. Xin Y. T. Chen S. N. Miao C. Y. Chen J. W. Zhang L. J. Wang State Key Laboratory of Precision Measurement Technology and Instruments Key Laboratory of Photon Measurement and Control Technology of Ministry of Education Department of Precision Instrument Tsinghua University Beijing 100084 China Shanghai EBIT Lab Key Laboratory of Nuclear Physics and Ion-Beam Application Institute of Modern Physics Department of Nuclear Science and Technology Fudan University Shanghai 200433 China Department of Physics Tsinghua University Beijing 100084 China

Regarding microwave frequency standards based on trapped ions, we report on the determination of the hyperfine splittings and the Landé gJ factors of Cd+111,113. The hyperfine splittings and Landé gJ factors of the 5s2S1/2 and 5p2P1/2,3/2 states of Cd+111,113 are calculated using the multiconfiguration Dirac-Hartree-Fock scheme. Furthermore, the hyperfine splittings of the 5p2P3/2 state of Cd+111,113 are derived based on the laser-induced fluorescence spectroscopy. The Cd+ ions are confined in a linear Paul trap and sympathetically cooled by laser-cooled Ca+ ions. The calculated values and the derived values are cross-checked, thereby guaranteeing the reliability of our results. The results provided in this paper can improve the signal-to-noise ratio of the clock transition and the accuracy of the second-order Zeeman shift correction, thus further improving the stability and accuracy of the microwave frequency standards based on trapped Cd+111,113 ions.

关键词： Atomic & molecular structure Atomic spectra Atomic, optical & lattice clocks Cooling & trapping Electron correlation calculations for atoms & ions Fine & hyperfine structure Optical pumping

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Heterogeneous Multi-Robot Cooperative Welding Task Allocation Based on Task-Centered Optimization: An Industrial Case Study

SSRN

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SSRN 2023年

作者： Liu, Wenbo Kuang, Zhian Zhou, Bo Li, Shihua School of Automation Southeast University Nanjing210096 China Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Nanjing210096 China Shanghai Friendess Electronic Technology Shanghai201100 China

In this article, the complex task assignment, scheduling and planning of complex heterogeneous multi-robot welding process are studied. For large workpiece welding tasks that involve complex heterogeneous multi-robot task allocation under different internal and external constraints, the traditional multi-robot task allocation (MRTA) framework is extended to a novel and unified heterogeneous multi-robot (H-MRTA) framework, and a hierarchical optimization algorithm is proposed. Firstly, an optimization model based on the H-MRTA framework is established. Taking into account constraints such as accessibility, collision and welding process, the optimization objectives are formulated by combining the total welding time and the task balance between robots. Then, to obtain the optimal solution, a stepwise optimization algorithm is devised to solve the MRTA problem from top to bottom in two layers: working area division problem and multi-robot path planning problem. For the working area division problem, a task-centered optimization model is proposed, which aims to balance the workload among robots, and is solved by branch-and-bound method. For the multi-robot path planning problem, multiple process constraints are considered and the total working time is minimized as the objective function. The effectiveness of the optimization algorithm is verified by a case study on the welding task of a large plate element in a ship hull. compared to two other state-of-the-art algorithms, the proposed optimization algorithm achieves a task allocation scheme with a shorter welding time, a shorter waiting time and a higher welding productivity, which demonstrates the effectiveness and feasibility of the stepwise optimization-based task allocation algorithm for complex heterogeneous multi-robot. © 2023, The Authors. All rights reserved.

关键词： Industrial robots

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A microwave photonic prototype for concurrent radar detection and spectrum sensing over an 8 to 40 GHz bandwidth

arXiv

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arXiv 2024年

作者： Shi, Taixia Liang, Dingding Wang, Lu Li, Lin Guo, Shaogang Gao, Jiawei Li, Xiaowei Lin, Chulun Shi, Lei Ding, Baogang Liu, Shiyang Yang, Fangyi Jiang, Chi Chen, Yang Shanghai Key Laboratory of Multidimensional Information Processing School of Communication and Electronic Engineering East China Normal University Shanghai200241 China Space Optoelectronic Measurement and Perception Lab Beijing Institute of Control Engineering Beijing100190 China Shanghai Lujie Communication Technology Company Limited Shanghai201613 China

In this work, a microwave photonic prototype for concurrent radar detection and spectrum sensing is proposed, designed, built, and investigated. A direct digital synthesizer and an analog electronic circuit are integrated to generate an intermediate frequency (IF) linearly frequency-modulated (LFM) signal with a tunable center frequency from 2.5 to 9.5 GHz and an instantaneous bandwidth of 1 GHz. The IF LFM signal is converted to the optical domain via an intensity modulator and then filtered by a fiber Bragg grating (FBG) to generate only two 2nd-order optical LFM sidebands. In radar detection, the two optical LFM sidebands beat with each other to generate a frequency-and-bandwidth-quadrupled LFM signal, which is used for ranging, radial velocity measurement, and imaging. By changing the center frequency of the IF LFM signal, the radar function can be operated within 8 to 40 GHz. In spectrum sensing, one 2nd-order optical LFM sideband is selected by another FBG, which then works in conjunction with the stimulated Brillouin scattering gain spectrum to map the frequency of the signal under test to time with an instantaneous measurement bandwidth of 2 GHz. By using a frequency shift module to adjust the pump frequency, the frequency measurement range can be adjusted from 0 to 40 GHz. The prototype is comprehensively studied and tested, which is capable of achieving a range resolution of 3.75 cm, a range error of less than ±2 cm, a radial velocity error within ±1 cm/s, delivering clear imaging of multiple small targets, and maintaining a frequency measurement error of less than ±7 MHz and a frequency resolution of better than 20 MHz. Copyright © 2024, The Authors. All rights reserved.

关键词： Fiber Bragg gratings

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