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2nd International Conference on New Materials, Machinery, and Vehicle engineering, NMMVE 2023

作者： Wei, Naikun Yin, Xuyue Li, Zufa Xi, Juntong Yang, Rundang Kong, Ning School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China Shanghai Shipbuilding Technology Research Institute Shanghai200032 China National Engineering Research Center of Ship Intelligent Manufacturing Shanghai200032 China School of Mechanical Engineering Tong Ji University Shanghai201804 China Shanghai Waigaoqiao Shipbuilding Co. Ltd. Shanghai200137 China

ISBN: (纸本)9781643684208

Thin plates constitute more than 80% of the structural components in shipbuilding, and butt welding is an essential technological process in ship manufacturing. Different from general butt welding, thin plate welding for shipbuilding is characterized by long length (≥ 15 m), narrow seam width (≤ 1 mm), and high precision demands (≤ 0.5 mm). The clamping deformation, arc sparks, and noise pollution during the welding seriously affect the tracking precision in automated welding. To address this problem, this paper presents a seam tracking algorithm combining image processing techniques and spatiotemporal tracking data filtering techniques to acquire a steady and smooth torch trajectory with less position variation. In the image processing stage, a spatiotemporal density mask image processing method is proposed to preserve effective pixels in spatiotemporal laser images to resist noises and improve the accuracy of welding point position estimation. Experimental results show that the frequency of the proposed seam tracking method can reach 30 Hz, the average absolute tracking error is less than 0.25 mm, and the maximum tracking error is less than 0.4 mm. The welding torch runs more smoothly during welding thus leading to higher welding quality. © 2023 The authors and IOS Press.

关键词： Butt welding

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Preparation and 3D printing of high-thermal-conductivity continuous mesophase-pitch-based carbon fiber/epoxy composites

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2023年第2期24卷 162-172页

作者： Haiguang ZHANG Kunlong ZHAO Qingxi HU Jinhe WANG Rapid Manufacturing Engineering Center School of Mechatronical Engineering and AutomationShanghai UniversityShanghai 200444China Shanghai Key Laboratory of Intelligent Manufacturing and Robotics Shanghai UniversityShanghai 200072China National Demonstration Center for Experimental Engineering Training Education Shanghai UniversityShanghai 200444China Nano-Science&Technology Research Center School of ScienceShanghai UniversityShanghai 200444China

To meet the requirements of spacecraft for the thermal conductivity of resins and solve the problem of low thermal conduction efficiency when 3D printing complex parts,we propose a new type of continuous mesophase-pitch-based carbon fiber/thermoplastic polyurethane/epoxy(CMPCF/TPU/epoxy)composite filament and its preparation process in this *** composite filament is based on the high thermal conductivity of CMPCF,the high elasticity of TPU,and the high-temperature resistance of *** tensile strength and thermal conductivity of the CMPCF/TPU/epoxy composite filament were *** CMPCF/TPU/epoxy composites are formed by 3D printing technology,and the composite filament is laid according to the direction of heat conduction so that the printed part can meet the needs of directional heat *** experimental results show that the thermal conductivity of the printed sample is 40.549 W/(m·K),which is 160 times that of pure epoxy resin(0.254 W/(m·K)).It is also approximately 13 times better than that of polyacrylonitrile carbon fiber/epoxy(PAN-CF/epoxy)*** study breaks through the technical bottleneck of poor printability of *** provides a new method for achieving directional thermal conductivity printing,which is important for the development of complex high-performance thermal conductivity products.

关键词： Thermal conductivity 3D printing Continuous mesophase-pitch-based carbon fiber(CMPCF) Thermoplastic polyurethane(TPU) Epoxy composite filament

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Comparative Analysis of Classification Methods for Diagnosing Myasthenia Gravis based on Lumbar Electromyography 12

Comparative Analysis of Classification Methods for Diagnosin...

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12th International Conference on Computing and Pattern Recognition, ICCPR 2023

作者： Ma, Yue Yang, Banghua Zan, Peng Zhang, Yonghuai Shanghai University School of Mechanical and Electrical Engineering and Automation Shanghai China Engineering Research Center of Traditional Chinese Medicine Intelligent Rehabilitation Ministry of Education Shanghai University of Traditional Chinese Medicine Shanghai201203 China Shanghai Shaonao Technology Co. Ltd. Shanghai China

ISBN: (纸本)9798400707988

Sarcopenia is a disease of the elderly characterized by a loss of muscle strength and muscle mass that significantly affects health status, functional independence and quality of life in older adults. In order to reduce the negative impact of the disease on individuals, diagnosis alone is not enough;we need a deeper understanding of the disease. With the widespread use of smart and minimally invasive wearable devices, surface electromyography (sEMG) is becoming increasingly important in the prevention and diagnosis of sarcopenia. The availability of these technologies provides a non-invasive way to monitor muscle activity and provide detailed information about muscle health status. The application of sEMG allows us to gain a more comprehensive understanding of the development and progression of sarcopenia so that we can adopt appropriate prevention and treatment strategies to improve the quality of life of the elderly. In this study, surface EMG signals were extracted from the multifidus and lumbar iliac rib muscles and used to diagnose the presence of sarcopenia. Twenty-eight subjects aged ≥50 years were recruited through shanghai Pudong Gongli Hospital and compared using multiple classifiers, of which the support vector machine classifier had the highest accuracy rate. © 2023 ACM.

关键词： Muscle

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A Wearable Brain-Computer Interface System for Fatigue Detection in Driving 12

A Wearable Brain-Computer Interface System for Fatigue Detec...

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12th International Conference on Computing and Pattern Recognition, ICCPR 2023

作者： Shen, Ying Yang, Banghua Yang, Aolei Xia, Xinxing Zhang, Yonghuai Gao, Shouwei Shanghai University School of Mechanical and Electrical Engineering and Automation Shanghai China Engineering Research Center of Traditional Chinese Medicine Intelligent Rehabilitation Ministry of Education Shanghai University of Traditional Chinese Medicine Shanghai201203 China Shanghai Shaonao Technology Co. Ltd. Shanghai China

ISBN: (纸本)9798400707988

Fatigue driving poses a significant threat to driver safety, leading to an increased risk of traffic accidents and potential harm to both life and property. Traditional fatigue detection methods, such as machine vision, are low effective due to factors such as lighting conditions and obstructions such as the presence of glasses. To address this issue and achieve more accurate fatigue detection, we design a Brain-computer interface (BCI) fatigue driving detection system based on electroencephalography (EEG) and electrooculography (EOG), specifically for measuring the fatigue level of drivers. The system includes three categories of fatigue level recognition. EEG and EOG data obtained from 10 subjects are classified using algorithms encapsulated in the main system. Remarkably, the system achieves an impressive average accuracy of 80.475% in recognizing fatigue levels, providing timely fatigue driving warnings as crucial feedback to the subjects. Additionally, the main system offers interactive features, including managing driver information and monitoring driver status. The system achieves real-time fatigue driving warnings and proposes a new method for detecting driving fatigue. © 2023 ACM.

关键词： Electroencephalography

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Semantic Dependency Parsing with Edge GNNs

Semantic Dependency Parsing with Edge GNNs

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2022 Findings of the Association for Computational Linguistics: EMNLP 2022

作者： Yang, Songlin Tu, Kewei School of Information Science and Technology ShanghaiTech University Shanghai Engineering Research Center of Intelligent Vision and Imaging China

Second-order neural parsers have obtained high accuracy in semantic dependency parsing. Inspired by the factor graph representation of second-order parsing, we propose edge graph neural networks (E-GNNs). In an E-GNN, each node corresponds to a dependency edge, and the neighbors are defined in terms of sibling, co-parent, and grandparent relationships. We conduct experiments on SemEval 2015 Task 18 English datasets, showing the superior performance of E-GNNs. © 2022 Association for Computational Linguistics.

关键词： Semantics

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Attenuated niacin-induced skin flush response in individuals with clinical high risk for psychosis

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General Psychiatry 2022年第2期35卷 92-100页

作者： Ranpiao Gan Yanyan Wei Guisen Wu Jiahui Zeng Yegang Hu Lihua Xu Xiaochen Tang Xiaohua Liu Haichun Liu Tao Chen Jijun Wang Tianhong Zhang Shanghai Intelligent Psychological Evaluation and Intervention Engineering Technology Research Center Shanghai Key Laboratory of Psychotic DisordersShanghai Mental Health CenterShanghai Jiao Tong University School of MedicineShanghaiChina Department of Automation Shanghai Jiao Tong UniversityShanghaiChina Big Data Research Lab University of WaterlooWaterlooOntarioCanada Center for Excellence in Brain Science and Itelligence Technology(CEBSIT) Chinese Academy of ScienceShanghaiChina Brain Science and Technology Research Center Shanghai Jiao Tong UniversityShanghaiChina

Background Im paired sesitwity of he soin Mlush response bo miacin is one of the most rpicated findngs in patents with schizoprenia *** studies have usaly focused on postonset psychusis,and ll is knowm about the dinical high-risk(CHR)phase of niacin senstity in psychosis Aims To proftle and compare the miacin flush responsge among CHR individuals(converters and non-coverters)patients with frstepso schinophrenia(FES)and healty controls(HCs).Methods Sensivily 1o ftour concentralions (0.1-0001M)of aqueous methylnicotinate was tested in 105 CHR individuals,57 patients with FES and 52 *** individuals were further grouped as converters and non converters according to the 2-year follow-up *** flush response scores were rated on a 4-point *** Of the 105 CHR individuals,21 individuals were lost during the study,leaving 84 CHR individuals;16(19.0%)converted to full psychosis at 2 years of *** response scores identifed in the CHR samples were characterised as modest degree levels,intermediate between those of HC individuals and patients with *** flush responses in the CHR group mimicked the responses observed in the FES group at higher concentrations(0.01 M,0.1 M)and longer time points(15 min,20min);however,these became comparable vith the responses in the HC group at the shorter time points and at lower concentr *** converters exhibited lower mean flush response scores than the *** Attenuated niacin-induced flushing emerged during the early phase of *** devices should be developed and verified for objective quantification of skin responses in the CHR population.

关键词： Skin high shorter

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CdS/Ti-Si-O Composite Photoanode for Photoelectrochemical Hydrogen Generation

CdS/Ti-Si-O Composite Photoanode for Photoelectrochemical Hy...

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10th Symposium on Dielectrics for Nanosystems: Materials Science, Processing, Reliability, and Manufacturing, held at the 245th ECS Meeting

作者： Feng, Weilong Ding, Dongyan Chen, Zhi SJTU-Zhongmu Joint Research Center for Materials and Technology of Intelligent and Connected Vehicles Institute of Electronic Materials and Technology School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Department of Electrical & Computer Engineering Center for Nanoscale Science & Engineering University of Kentucky LexingtonKY40506 United States

ISBN: (纸本)9781623326784

Advancements in clean energy drive socio-economic development and foster a sustainable future by restructuring energy systems and promoting low-carbon development. In this paper, we presented a comprehensive investigation on the design and performance characterization of CdS/Ti-Si-O composite photoanodes for photoelectrochemical (PEC) hydrogen generation. Silicon-doped TiO2 nanotube arrays were fabricated through anodization of Ti-5Si alloy, followed by the deposition of CdS using the SILAR (successive ionic layer adsorption and reaction) process, resulting in nanostructured Ti-Si-O photoanodes modified with CdS. The composite photoanodes were characterized in terms of their composition, microstructure, optical properties and photoelectrochemical hydrogen production performance. The composite photoanodes revealed a notable enhancement in PEC hydrogen generation properties with a photocurrent density of 7.86 mA/cm2,which was 19.15 times and 9.59 times to those of the undoped TiO2 photoanode and Ti-Si-O photoanode, respectively. The Si-doping mechanism of the photoanodes was elucidated through Density Functional Theory (DFT) calculations. The synergistic combination of Si-doping and CdS modification represents a novel and promising approach for the design of efficient nanostructured photoanodes. © The Electrochemical Society.

关键词： Cadmium sulfide

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Pulse-doubling perovskite nanowire lasers enabled by phonon-assisted multistep energy funneling

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Light(Science & Applications) 2024年第8期13卷 1645-1654页

作者： Chunhu Zhao Jia Guo Jiahua Tao Junhao Chu Shaoqiang Chen Guichuan Xing Hunan Provincial Key Laboratory of Carbon Neutrality and Intelligent Energy School of Resource&EnvironmentHunan University of Technology and Business410205 ChangshaChina Engineering Research Center for Nanophotonics and Advanced Instrument Ministry of EducationSchool of Physics and Electronic ScienceEast China Normal University200241 ShanghaiChina Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of Macao999078 MacaoChina

Laser pulse multiplication from an optical gain medium has shown great potential in miniaturizing integrated optoelectronic *** multiple quantum wells(MQWs)structures have recently been recognized as an effective gain media capable of doubling laser pulses that do not rely on external optical *** the light amplifications enabled with pulse doubling are reported based on the perovskite MQWs thin films,the micronanolasers possessed a specific cavity for laser pulse multiplication and their corresponding intrinsic laser dynamics are still ***,a single-mode double-pulsed nanolaser from self-assembled perovskite MQWs nanowires is realized,exhibiting a pulse duration of 28 ps and pulse interval of 22 ps based on single femtosecond laser pulse *** is established that the continuous energy building up within a certain timescale is essential for the multiple population inversion in the gain medium,which arises from the slowing carrier localization process owning to the stronger exciton–phonon coupling in the smaller-n ***,the double-pulsed lasing is achieved from one fast energy funnel process from the adjacent small-n QWs to gain active region and another slow process from the spatially separated *** report may shed new light on the intrinsic energy relaxation mechanism and boost the further development of perovskite multiple-pulse lasers.

关键词： doubling energy phonon

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A Meta-learning System for Automatic Objects Tracking 4

A Meta-learning System for Automatic Objects Tracking

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4th International Conference on Applied Machine Learning, ICAML 2022

作者： Li, Qiaolin Wang, Wenfeng Zhang, Jingjing Research Institute of Intelligent Engineering and Data Applications Shanghai Institute of Technology Shanghai China Research Center of Artificial Intelligence and Robotics Interscience Institute of Management and Technology Bhubaneswar India

ISBN: (纸本)9781665462655

Recent years, reinforcement learning has been developed in many area and achieve high performance in many application. However, for huge amount data and training will make hard leaning for the agent of reinforcement learning, in the project, the agent of DDQN Network was integrated with LSTM meta learner for learning the game called Cartpole and LunarLander. It get a good performance for large train. © 2022 IEEE.

关键词： Reinforcement learning

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Polarization‑entangled photon‑pair source with van der Waals 3R‑WS_(2) crystal

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eLight 2024年第1期4卷 99-106页

作者： Jiangang Feng Yun‑Kun Wu Ruihuan Duan Jun Wang Weijin Chen Jiazhang Qin Zheng Liu Guang‑Can Guo Xi‑Feng Ren Cheng‑Wei Qiu Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Optical Science and Engineering and Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and PerceptionFudan UniversityShanghai 200433China

Ultracompact entangled photon sources are pivotal to miniaturized quantum photonic *** der Waals(vdW)nonlinear crystals promise efficient photon-pair generation and on-chip monolithic integration with nanophotonic ***,it remains challenging to generate maximally entangled Bell states of photon pairs with high purity,generation rate,and fidelity required for practical ***,we realize a polarization-entangled photon-pair source based on spontaneous parametric down conversion in an ultrathin rhombohedral tungsten disulfide(3R-WS2)*** vdW entangled photonic source exhibits a high photon-pair purity with a coincidenceto-accidental ratio of above 800,a generation rate of 31 Hz,and two maximally polarization-entangled Bell states with fidelities exceeding 0.93 and entanglement degree over *** results stem from scalable optical nonlinearity,enhanced second-order susceptibility by electronic transitions,and a well-defined symmetry-enabled selection rule inherent in *** polarization entangled photon source can be integrated with photonic structures for generating more complex entangled states,thus paving an avenue for advanced quantum photonic systems toward computation and metrology.

关键词： purity maximal Polarization

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