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Data provider system——research and development of data service at Huairou Solar Observing Station (HSOS)

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Science China(Physics,Mechanics & Astronomy) 2009年第11期52卷 1778-1784页

作者： LIN GangHua wang xiaofan Key Laboratory of Solar Activity National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China

The data provider system has to provide users with reliable, constant and timely data information, and it has to guarantee further developments of new data applications. We develop a data provider system of hierarchical architecture with components, interactions and relationships in each layer. The system enables each layer to act in concert with each other without restrictions. It contributes to implementing the goal. The main frame of the data provider system has already been successfully implemented, the others of each layer are on the way according to the architecture.

关键词： data provider architecture solar active event prediction

Towards data-driven identiication and control of complex networks

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National Science Review 2014年第3期1卷 335-336页

作者： xiaofan wang Department of Automation Shanghai Jiao TongUniversity

Control theory has been well recognized as a‘mature’discipline,but research interest has repeatedly been renewed due to the emergence of new viewpoints and introduction of new methodologies[1].Recent interests on identiication and control of complex networks provide excellent examples of such evidence(Fig.1).Uncovering complex networked sys-

关键词： work Towards data-driven identiication and control of complex networks net data

ROBUST CONSENSUS FOR MULTI-AGENT SYSTEMS OVER UNBALANCED DIRECTED NETWORKS

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Journal of Systems Science & Complexity 2014年第6期27卷 1121-1137页

作者： LI Dequan wang xiaofan YIN Zhixiang School of Science Anhui University of Science and Technology Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China

In this paper,a distributed consensus protocol is proposed for discrete-time single-integer multi-agent systems with measurement noises under general fixed directed *** time-varying control gains satisfying the stochastic approximation conditions are introduced to attenuate noises,thus the closed-loop multi-agent system is intrinsically a linear time-varying stochastic difference *** the mean square consensus convergence analysis is developed based on the Lyapunov technique,and the construction of the Lyapunov function especially does not require the typical balanced network topology condition assumed for the existence of quadratic Lyapunov ***,the proposed consensus protocol can be applicable to more general networked multi-agent systems,particularly when the bidirectional and/or balanced information exchanges between agents are not *** the proposed protocol,it is proved that the state of each agent converges in mean square to a common random variable whose mathematical expectation is the weighted average of agents' initial state values;meanwhile,the random variable's variance is bounded.

关键词： Consensus directed network distributed algorithm stochastic approximation.

DISTRIBUTED QUANTIZED CONSENSUS FOR AGENTS ON DIRECTED NETWORKS

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Journal of Systems Science & Complexity 2013年第4期26卷 489-511页

作者： LI Dequan LIU Qipeng wang xiaofan Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China School of Science Anhui University of Science and Technology

Communication bandwidth and network topology are two important factors that affect performance of distributed consensus in multi-agent *** available works about quantized average consensus assume that the adjacency matrices associated with the digraphs are doubly stochastic,which amounts to that the digital networks are ***,this assumption may be unrealistic in *** this paper,without assuming double stochasticity,the authors revisit an existing quantized average consensus protocol with the logarithmic quantization scheme,and investigate the quantized consensus problem in general directed digital networks that are strongly connected but not necessarily *** authors first derive an achievable upper bound of the quantization precision parameter to design suitable logarithmic quantizer,and this bound explicitly depends on network ***,by means of the matrix transformation and the Lyapunov techniques,the authors provide a testable condition under which the weighted average consensus can be achieved with the proposed quantized protocol.

关键词： Consensus protocol digraph logarithmic quantization multi-agent systems.

SOCIAL LEARNING WITH TIME-VARYING WEIGHTS

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Journal of Systems Science & Complexity 2014年第3期27卷 581-593页

作者： LIU Qipeng FANG Aili wang Lin wang xiaofan Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China

This paper investigates a non-Bayesian social learning model, in which each individual updates her beliefs based on private signals as well as her neighbors＇ beliefs. The private signM is involved in the updating process through Bayes＇ rule, and the neighbors＇ beliefs are embodied in through a weighted average form, where the weights are time-varying. The authors prove that agents eventually have correct forecasts for upcoming signals, and all the beliefs of agents reach a consensus. In addition, if there exists no state that is observationally equivalent to the true state from the point of view of all agents, the authors show that the consensus belief of the whole group eventually reflects the true state.

关键词： Consensus social learning social networks time-varying weights.

Estimating optimal substitution scale of urban gasoline taxis by electric taxis in the era of green energy:a case study of Zhengzhou City

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Geo-Spatial Information Science 2023年第3期26卷 514-539页

作者： Zhixiang Fang xiaofan wang Ying Zhuang Xianglong Liu State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina Key Laboratory of Advanced Public Transportation Science China Academy of Transportation SciencesBeijingChina

Electric Taxis(ETs)are the most favored alternatives to Gasoline Taxis(GTs)in cities that aim to reduce environmental *** to develop a reasonable scale on which GTs are substituted by ETs remains a challenge to governments due to the dynamics and complexity of the taxi *** address this challenge,this paper develops a discrete-event-based simulation framework to simulate participants in the system and estimate the results under different substitution scales,which are helpful to understanding the status changing law of entities under different substitution scales,such as the operating indices of ETs,the unsatisfied travel requirements of passengers,and the usage state of charging *** framework abstracts the behavioral process of ETs into three elements,namely,entity,behavior,and *** entities are constructed from the information derived from the trajectory *** behaviors are defined by rules following behavioral logic under anxiety psychology,which is caused by the limited range of *** events are triggered based on rules from *** the help of this framework,a multi-objective optimization model is developed to obtain the optimal substitution scale of GTs in the case study area of Zhengzhou ***,the approach could provide a practical tool to address this challenge,which could support further studies of the effect of ETs on urban taxis.

关键词： Electric Taxi(ET) substitution scale discrete-event simulation decision support multi-objective optimization

Observational cross helicity on the solar surface

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Science China(Physics,Mechanics & Astronomy) 2014年第3期57卷 589-596页

作者： ZHAO MingYu wang xiaofan ZHANG HongQi Key Laboratory of Solar Activity National Astronomical ObservatoryChinese Academy of Sciences

We analyzed the correlation of the solar magnetograms and Dopplergrams from SOHO/MDI and SDO/HMI respectively. It is found that the full disk correlation coefficient of Dopplergrams is more than 0.80 between SOHO/MDI and SDO/HMI. The full disk correlation coefficient of magnetograms is about 0.73 and is more than 0.95 for active regions only. We also analyzed the distribution of the cross helicity （velocity-magnetic-field correlation） on the solar surface. It is found that the latitude distributions of the cross helicity based on SOHO/MDI data and SDO/HMI data have similar tendencies, and in the analysis of solar active regions the amplitude of the horizontal component of the mean cross helicity is about two times the line-of-sight one.

关键词： cross helicity photosphere magnetic fields solar activity

The Strength of Structural Diversity in Online Social Networks

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Research 2021年第1期2021卷 1203-1212页

作者： Yafei Zhang Lin wang Jonathan JHZhu xiaofan wang Alex‘Sandy’Pentland Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information ProcessingMinistry of Education of ChinaShanghai 200240China Department of Media and Communication and School of Data Science City University of Hong KongHong Kong S.A.R.China Department of Automation Shanghai UniversityShanghai 200444China Media Lab Massachusetts Institute of TechnologyCambridgeMA 02139USA

Understanding the way individuals are interconnected in social networks is of prime significance to predict their collective *** a large-scale dataset from a knowledge-sharing website,this paper presents an exploratory investigation of the way to depict structural diversity in directed networks and how it can be utilized to predict one’s online social *** capture the structural diversity of an individual,we first consider the number of weakly and strongly connected components in one’s contact neighborhood and further take the coexposure network of social neighbors into *** show empirical evidence that the structural diversity of an individual is able to provide valuable insights to predict personal online social reputation,and the inclusion of a coexposure network provides an additional ingredient to achieve that *** synthetically controlling several possible confounding factors through matching experiments,structural diversity still plays a nonnegligible role in the prediction of personal online social *** work constitutes one of the first attempts to empirically study structural diversity in directed networks and has practical implications for a range of domains,such as social influence and collective intelligence studies.

关键词： collective networks founding

Distributed Fault-Tolerant Consensus Tracking of Multi-Agent Systems Under Cyber-Attacks

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IEEE/CAA Journal of Automatica Sinica 2022年第6期9卷 1037-1048页

作者： Chun Liu Bin Jiang xiaofan wang Huiliao Yang Shaorong Xie School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444 School of Artificial Intelligence Shanghai UniversityShanghai 200444China IEEE College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Energy and Electrical Engineering Hohai UniversityNanjing 210016China School of Computer Engineering and Science Shanghai UniversityShanghai 200444China

This paper investigates the distributed fault-tolerant consensus tracking problem of nonlinear multi-agent systems with general incipient and abrupt time-varying actuator faults under ***,a decentralized unknown input observer is established to estimate relative states and actuator ***,the estimated and output neighboring information is combined with distributed fault-tolerant consensus tracking *** of reaching leader-following exponential consensus tracking of multi-agent systems under both connectivity-maintained and connectivity-mixed attacks are derived with average dwelling time,attack frequency,and attack activation rate technique,*** example verifies the effectiveness of the fault-tolerant consensus tracking algorithm.

关键词： Cyberattacks fault-tolerant consensus tracking incipient and abrupt actuator faults nonlinear multi-agent systems unknown input observer