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Seroprevalence and humoral immune durability of anti-SARS-CoV-2 antibodies in Wuhan, China: a longitudinal, population-level, cross-sectional study

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The Lancet 2021年第10279期397卷 1075-1084页

作者： He, Zhenyu Ren, Lili Yang, Juntao Guo, Li Feng, Luzhao Ma, Chao Wang, Xia Leng, Zhiwei Tong, Xunliang Zhou, Wang Wang, Geng Zhang, Ting Guo, Yan Wu, Chao Wang, Qing Liu, Manqing Wang, Conghui Jia, Mengmeng Hu, Xuejiao Wang, Ying Zhang, Xingxing Hu, Rong Zhong, Jingchuan Dai, Juan Chen, Lan Zhou, Xiaoqi Wang, Jianwei Yang, Weizhong Wang, Chen Wuhan Center for Disease Control & Prevention Wuhan China National Health Commission Key Laboratory of Systems Biology of Pathogens and Christophe Mérieux Laboratory Institute of Pathogen Biology Chinese Academy of Medical Sciences & Peking Union Medical College Beijing China State Key Laboratory of Medical Molecular Biology Department of Biochemistry and Molecular Biology Institute of Basic Medical Sciences Chinese Academy of Medical Sciences & Peking Union Medical College Beijing China School of Population Medicine and Public Health Chinese Academy of Medical Sciences & Peking Union Medical College Beijing China Key Laboratory of Respiratory Disease Pathogenomics Chinese Academy of Medical Sciences Beijing China National Immunization Program Chinese Center for Disease Control and Prevention Beijing China Department of Pulmonary and Critical Care Medicine Beijing Hospital National Center for Gerontology Institute of Geriatric Medicine of Chinese Academy of Medical Sciences Beijing China Department of Pulmonary and Critical Care Medicine Center of Respiratory Medicine National Clinical Research Center for Respiratory Diseases China-Japan Friendship Hospital Beijing China National Center for Respiratory Medicine Beijing China Chinese Academy of Engineering Beijing China

Background: Wuhan was the epicentre of the COVID-19 outbreak in China. We aimed to determine the seroprevalence and kinetics of anti-SARS-CoV-2 antibodies at population level in Wuhan to inform the development of vaccination strategies. Methods: In this longitudinal cross-sectional study, we used a multistage, population-stratified, cluster random sampling method to systematically select 100 communities from the 13 districts of Wuhan. Households were systematically selected from each community and all family members were invited to community health-care centres to participate. Eligible individuals were those who had lived in Wuhan for at least 14 days since Dec 1, 2019. All eligible participants who consented to participate completed a standardised electronic questionnaire of demographic and clinical questions and self-reported any symptoms associated with COVID-19 or previous diagnosis of COVID-19. A venous blood sample was taken for immunological testing on April 14–15, 2020. Blood samples were tested for the presence of pan-immunoglobulins, IgM, IgA, and IgG antibodies against SARS-CoV-2 nucleocapsid protein and neutralising antibodies were assessed. We did two successive follow-ups between June 11 and June 13, and between Oct 9 and Dec 5, 2020, at which blood samples were taken. Findings: Of 4600 households randomly selected, 3599 families (78·2%) with 9702 individuals attended the baseline visit. 9542 individuals from 3556 families had sufficient samples for analyses. 532 (5·6%) of 9542 participants were positive for pan-immunoglobulins against SARS-CoV-2, with a baseline adjusted seroprevalence of 6·92% (95% CI 6·41–7·43) in the population. 437 (82·1%) of 532 participants who were positive for pan-immunoglobulins were asymptomatic. 69 (13·0%) of 532 individuals were positive for IgM antibodies, 84 (15·8%) were positive for IgA antibodies, 532 (100%) were positive for IgG antibodies, and 212 (39·8%) were positive for neutralising antibodies at baseline. The pro

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Off-Policy Q-Learning for Anti-Interference control of Multi-Player systems ⁎

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IFAC-PapersOnLine 2020年第2期53卷 9189-9194页

作者： Jinna Li Zhenfei Xiao Tianyou Chai Frank. L. Lewis Sarangapani Jagannathan School of Information and Control Engineering Liaoning Shihua University Fushun 113001 China State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang 110819 China UTA Research Institute the University of Texas at Arlington Arlington TX 76118 USA Department of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO 65409 USA

This paper develops a novel off-policy game Q-learning algorithm to solve the anti-interference control problem for discrete-time linear multi-player systems using only data without requiring system matrices to be known. The primary contribution of this paper lies in that the Q-learning strategy employed in the proposed algorithm is implemented in an off-policy policy iteration approach other than on-policy learning due to the well-known advantages of off-policy Q-learning over on-policy Q-learning. All of the players work hard together for the goal of minimizing their common performance index meanwhile defeating the disturbance that tries to maximize the specific performance index, and finally they reach the Nash equilibrium of the game resulting in satisfying disturbance attenuation condition. In order to find the solution to the Nash equilibrium, the anti-interference control problem is first transformed into an optimal control problem. Then an off-policy Q-learning algorithm is proposed in the framework of typical adaptive dynamic programming (ADP) and game architecture, such that control policies of all players can be learned using only measured data. Comparative simulation results are provided to verify the effectiveness of the proposed method.

关键词： H ∞ control off-policy Q-learning game theory Nash equilibrium

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EXACT ISOHOLONOMIC MOTION of the PLANAR PURCELL S SWIMMER

arXiv

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arXiv 2019年

作者： Kadam, Sudin Phogat, Karmvir Singh Banavar, Ravi N. Chatterjee, Debasish Systems and Control Engineering Department Indian Institute of Technology Bombay MUMBAI India

In this article we present the discrete-Time isoholonomic problem of the planar Purcell s swimmer and solve it using the Discrete-Time Pontryagin maximum principle. The 3-link Purcell s swimmer is a locomotion system moving in a low Reynolds number environment. The kinematics of the system evolves on a principal fiber bundle. A structure preserving discrete-Time kinematic model of the system is obtained in terms of the local form of a discrete connection. An adapted version of the Discrete Maximum Principle on matrix Lie groups is then employed to come up with the necessary optimality conditions for an optimal state transfer while minimizing the control effort. These necessary conditions appear as a two-point boundary value problem and are solved using a numerical technique. Results from numerical experiments are presented to illustrate the algorithm. Copyright © 2019, The Authors. All rights reserved.

关键词： Maximum principle

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Dynamic Behavioral Analysis of Stimulus Response of Running Ants by High-Speed Robotic Platform 30

Dynamic Behavioral Analysis of Stimulus Response of Running ...

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30th International Symposium on Micro-NanoMechatronics and Human Science, MHS 2019

作者： Kawahara, Tomohiro Kawajiri, Yuuki Furukawa, Motoki Belal, Ahmad Ohtsuka, Hirofumi Ishii, Idaku Kyushu Institute of Technology Department of Biological Functions and Engineering Kitakyushu808-0196 Japan AS2M Department FEMTO-ST Institute BesanconF-25000 France National Institute of Technology Kumamoto College Department of Control and Information Systems Engineering Kumamoto861-1102 Japan Hiroshima University Department of System Cybernetics Higashi-Hiroshima739-0046 Japan

ISBN: (纸本)9781728126746

We have developed a novel system for applying local area stimulation to freely running/walking single ant on a 2D space. It allows us to inspect more natural characteristics and stimulus response of the ants, because they are not fixed and modified. The system is constructed by integrating the tracking part to take magnified view continuously using a high-speed vision sensor and the stimulation part to apply droplet stimulus using a highspeed inkjet mechanism. In order to clarify the effectiveness of the stimulation, examples of analysis of the dynamic stimulus response of single ant using the captured images are shown and discussed in this paper. © 2019 IEEE.

关键词： Robotics

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Human Motion Prediction Based on Visual Tracking 4

Human Motion Prediction Based on Visual Tracking

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4th International Conference on Robotics and automation engineering, ICRAE 2019

作者： Zou, Juncheng Yin, Weihua Wang, Everett X. Wang, Jiancheng Lu, Yan-Feng School of Mechanical Engineering Beijing University of Science and Technology China Institute of Science and Technology Innovation Dongguan University of Technology China School of Information Engineering Guangdong University of Technology Guangzhou China Cloud Computing Center Chinese Academy of Sciences China State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China

ISBN: (数字)9781728147406

ISBN: (纸本)9781728147406

Following and moving according to human motion is an important task for mobile robots. To ensure more compliant motion planning and execution of mobile robots, they can not be controlled by real-time visual information. In the tracking process, robots need to recognize and track the target then, plan the motion and execute the motion. In practical applications, the environments are very complex, such as illumination, shadows and occlusion, which the traditional visual tracking algorithms often deviate or lose the target. Therefore, to achieve fast human motion tracking, it is necessary to predict human motions by video prediction. In this paper, we propose a human motion tracking algorithm of mobile robot based on video prediciton. (1) The multi-layer generation adversarial loop network, which trained by off-line video dataset and learn how to predict human motion. (2) We used the pre-trained model to predict the state of the tracking target in the video. (3) This video prediction model was integrated into human-to-robot tracking algorithms of mobile robot following human system. Experiments show that the proposed algorithm can track human motion at a certain speed and precision. © 2019 IEEE.

关键词： Mobile robots

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State of charge estimation of parallel connected battery cells via descriptor system theory

arXiv

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arXiv 2020年

作者： Zhang, Dong Couto, Luis D. Benjamin, Sebastien Zeng, Wente Coutinho, Daniel F. Moura, Scott J. Department of Civil and Environmental Engineering University of California BerkeleyCA United States Department of Control Engineering and System Analysis Université Libre de Bruxelles BrusselsB-1050 Belgium Saft Batteries Total S.A. Total S.A. Department of Automation and Systems UFSC PO BOX 476 88040-900 Florianópolis SC Brazil

— This manuscript presents an algorithm for individual Lithium-ion (Li-ion) battery cell state of charge (SOC) estimation when multiple cells are connected in parallel, using only terminal voltage and total current measurements. For battery packs consisting of thousands of cells, it is desirable to estimate individual SOCs by only monitoring the total current in order to reduce sensing cost. Mathematically, series connected cells yield dynamics given by ordinary differential equations under classical full voltage sensing. In contrast, parallel connected cells are evidently more challenging because the dynamics are governed by a nonlinear descriptor system, including differential equations and algebraic equations arising from voltage and current balance across cells. An observer with linear output error injection is formulated, where the individual cell SOCs and local currents are locally observable from the total current and voltage measurements. The asymptotic convergence of differential and algebraic states is established by considering local Lipschitz continuity property of system nonlinearities. Simulation results on LiNiMnCoO2/Graphite (NMC) cells illustrate convergence for SOCs, local currents, and terminal voltage. Copyright © 2020, The Authors. All rights reserved.

关键词： Nonlinear equations

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Applications of Game Theory in Vehicular Networks: A Survey

arXiv

引用

arXiv 2021年

作者： Sun, Zemin Liu, Yanheng Wang, Jian Li, Guofa Anil, Carie Li, Keqiang Guo, Xinyu Sun, Geng Tian, Daxin Cao, Dongpu College of Computer Science and Technology Jilin University Changchun130012 China Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun130012 China Institute of Human Factors and Ergonomics College of Mechatronics and Control Engineering Shenzhen University Guangdong Shenzhen518060 China School of Computer Science and Engineering VIT-AP Andhra Pradesh Amaravati522237 India College of Engineering Nanjing Agricultural University Nanjing210031 China State Key Laboratory of Automotive Safety and Energy Department of Automotive Engineering Tsinghua University Beijing100084 China Beijing Advanced Innovation Center for Big Data and Brain Computing Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control School of Transportation Science and Engineering Beihang University Beijing100191 China Waterloo Cognitive Autonomous Driving Lab University of Waterloo N2L 3G1 Canada

In the Internet of things (IoT) era, vehicles and other intelligent components in an intelligent transportation system (ITS) are connected, forming vehicular networks (VNs) that provide efficient and safe traffic and ubiquitous access to various applications. However, as the number of nodes in an ITS increases, it is challenging to satisfy a varied and large number of service requests with different quality of service (QoS) and security requirements in highly dynamic VNs. Intelligent nodes in VNs can compete or cooperate for limited network resources to achieve the objective for either an individual or a group. Game theory (GT), a theoretical framework designed for strategic interactions among rational decision makers sharing scarce resources, can be used to model and analyze individual or group behaviors of communicating entities in VNs. This paper primarily surveys the recent developments of GT in solving various challenges of VNs. This survey starts with an introduction to the background of VNs. A review of GT models studied in the VNs is then introduced, including the basic concepts, classifications, and applicable vehicular issues. After discussing the requirements of VNs and the motivation of using GT, a comprehensive literature review on GT applications in dealing with the challenges of current VNs is provided. Furthermore, recent contributions of GT to VNs that are integrated with diverse emerging 5G technologies are surveyed. Finally, the lessons learned are given, and several key research challenges and possible solutions of applying GT in VNs are outlined. Copyright © 2021, The Authors. All rights reserved.

关键词： Quality of service

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Subtropical vegetation damage and recovery dynamics after the great 2008 Chinese ice storm

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Agricultural and Forest Meteorology 2025年 372卷

作者： Xiong, Yujiu Yan, Wenjie Wang, Xu Luo, Yong Feng, Hanhua Zhao, Wenli Zhu, Biqing Ye, Zhenhua Li, Hao School of Civil Engineering Sun Yat-Sen University Guangdong Zhuhai 519082 China Guangdong Engineering Technology Research Center of Water Security Regulation and Control for Southern China Sun Yat-sen University Guangzhou 510275 China Research Institute of Tropical Forestry Chinese Academy of Forestry Guangzhou 510520 China Beijiangyuan National Forest Ecosystem Research Station Nanling Mts Guangzhou 510520 China Guangdong Forestry Survey and Planning Institute Guangzhou 510520 China Department of Earth and Environmental Engineering Columbia University 10027 NY United States Max Planck Institute for Biogeochemistry Jena Germany The International Institute for Applied Systems Analysis (IIASA) Vienna Austria Guangzhou Institute of Forestry and Landscape architecture Guangzhou 510405 China

In early 2008, an extreme ice storm struck southern China, including the subtropical Guangdong Province, causing substantial ecological damage and economic losses. Previous evaluations of vegetation damage during this event primarily focused on the immediate physical structure damage caused by ice, overlooking the delayed physiological damage from extreme low-temperature stress, especially in adjacent non-frozen regions. Combining remotely-sensed (i.e., MODIS Gross Primary Productivity (GPP) and Enhanced Vegetation index (EVI)) and in-situ data, we conducted a more complete assessment of subtropical vegetation damage and recovery following the 2008 Chinese ice storm by considering time-lag effects. We found vegetation damage and subsequent recovery exhibited distinct spatial patterns correlated to ice storm severity. Assessments that accounted for time-lag effects were more aligned with ground truth, revealing that vegetation damage signal typically lagged the event onset by 1–2 months. The time-lag effect showed distinct patterns in non-frozen regions experiencing secondary low-temperature stress (without direct ice storm exposure). Physiological damage dominated these areas, reducing GPP by 62 %. In contrast, physical structural damage caused a comparatively smaller decline (51 %) in EVI. We also found a positive correlation between frozen time and the severity of vegetation damage, with 37 % of vegetation damaged in less frozen zone versus 70 % in severe frozen zone. Subsequent recovery of GPP and EVI to pre-ice storm conditions took 4–9 months, with GPP recovering faster than EVI, especially in severe frozen forests. Such positive correlation also existed between damage severity (or recovery time) and elevation and slope, but the pattern varied across different freezing zones. Our findings highlight the delayed physiological damage from extreme low-temperature stress and provide new insights into subtropical vegetation dynamics following extreme ice storms. © 20

关键词： EVI Extreme climate event GPP Guangdong Nanling mountain region Subtropical ecosystem

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Correction: Bubble-enhanced ultrasonic microfluidic chip for rapid DNA fragmentation

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Lab on a chip 2023年第8期23卷 2141页

作者： Lin Sun Thomas Lehnert Songjing Li Martin A M Gijs Laboratory of Microsystems Ecole Polytechnique Fédérale de Lausanne CH-1015 Switzerland. martin.gijs@epfl.ch. Department of Fluid Control and Automation School of Mechatronics Engineering Harbin Institute of Technology Harbin Heilongjiang 150000 P. R. China.

Correction for 'Bubble-enhanced ultrasonic microfluidic chip for rapid DNA fragmentation' by Lin Sun , , 2022, , 560-572, https://***/10.1039/D1LC00933H.

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Development of power drive technology for high lift system of commercial aircraft

Development of power drive technology for high lift system o...

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CSAA/IET International Conference on Aircraft Utility systems (AUS 2020)

作者： T. Liu Y. Zhang W. Wang J. Ju W. Yu Shanghai Aircraft Design and Research Institute Department of Flight Control System China Commercial Aircraft Corporation of China Ltd. Department of Science and Technology Management China Shanghai Jiaotong University Department of Automation School of Electronic Information and Electrical Engineering China

In this paper, the development of power driving technology for high lift system of modern commercial aircraft is presented. Three kinds of power driving technical schemes of high lift system are demonstrated together with their characteristics. Various applications of power drive technology on present mainstream aircrafts have been addressed and analyzed respectively. In addition to the analysis of existing power drive technology, this work presented that distributed electric power drive technology could be a potential future development trend. The paper can be read as a reference for selecting power driving technical scheme of high lift systems at conceptual design phase of a commercial aircraft.

关键词： aircraft power systems aircraft design engineering electric drives

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