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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

基于形态学性状的洪平杏与近缘种种间关系研究

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植物科学学报 2024年第1期42卷 14-22页

作者：刘志娥屈定镰谭霄华胡丹杜巍汪小凡武汉大学生命科学学院武汉430072 神农架林区林业管理局湖北神农架442499 太原市第三十七中学太原030012

本研究通过野外调查获得洪平杏(Armeniaca hongpingensis ***&***)、杏(*** Lam.)、梅(*** Siebold)和杏梅(*** *** Makino)有关的叶、花、果、果核及枝条的21个定量性状和15个定性性状,并对这些数据进行了聚类分析。结果显示,无论是PA... 详细信息

本研究通过野外调查获得洪平杏(Armeniaca hongpingensis ***&***)、杏(*** Lam.)、梅(*** Siebold)和杏梅(*** *** Makino)有关的叶、花、果、果核及枝条的21个定量性状和15个定性性状,并对这些数据进行了聚类分析。结果显示,无论是PAM聚类还是UPGMA聚类分析都可清晰地将4种杏属植物分开,说明物种之间具有明显的区分特征。主成分分析的前3个主成分中,一年生枝颜色、被毛情况,叶及果实被毛,叶形指标(叶形、叶尖、叶基)和果核表面特征的绝对权重值都在0.9以上,表明这些性状在4种杏属植物的分类中具有重要的作用。电镜扫描观察结果发现,供试花粉均是单粒花粉,等极,辐射对称,具3孔萌发沟。杏、梅、杏梅的花粉表面纹饰均为条纹状,但洪平杏的表面纹饰为间断条纹,且有不明显穿孔。4种植物叶上表皮细胞均具条纹状角质增厚。与其他种相比,洪平杏细胞表面条纹常弯曲、交叠,无固定走向。根据聚类分析结果和微形态特征,支持将洪平杏作为区别于梅和杏的一个独立种的处理。

关键词：洪平杏种间关系微形态孢粉学

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基于无定河生态流量保障的水资源调度研究

陕西水利 2024年第4期 32-35页

作者：王小帆苗磊翟城武陕西水环境工程勘测设计研究院陕西西安710054

无定河是黄河一级支流,无定河流域是国家级榆林能源化工基底的核心组成部分。科学确定及保障无定河生态流量,事关新时期生态文明建设,事关黄河流域高质量发展。基于无定河的水文情势特征和生态、经济功能定位,考虑生态需水过程,科学计... 详细信息

无定河是黄河一级支流,无定河流域是国家级榆林能源化工基底的核心组成部分。科学确定及保障无定河生态流量,事关新时期生态文明建设,事关黄河流域高质量发展。基于无定河的水文情势特征和生态、经济功能定位,考虑生态需水过程,科学计算无定河干流生态需水量,并在“确保城镇生活用水,留足生态用水,调节工业用水与农业用水”的原则下提出符合当地环境条件并行之有效的水资源调度模型运行思路。在做好河流生态流量保障工作的前提下,实现有限水资源的高效利用,促进无定河流域高质量发展。

关键词：无定河流域生态流量水资源调度高质量发展

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角布鲁斯特效应

Science Bulletin 2024年第14期69卷 2170-2173页

作者：薛淑雯陈浩杰王笑凡胡传捷殷玉杭朱杉陈焕阳 Institute of Electromagnetics and Acoustics and Department of Physics College of Physical Science and TechnologyXiamen UniversityXiamen 361005China Department of Physics Xiamen University MalaysiaSepang 439000Malaysia Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen 518000China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

The Brewster reflectionless effect stands out as one of the simplest yet pivotal discoveries in manipulating waves[1,2].Initial investigations were limited to isotropic materials,but later,thanks to the advent of metamaterials,the phenomenon was found to expand into anisotropic *** anomalous Brewster effect has been recently demonstrated in metamaterials with rotation angle,thus increasing the number of degrees of freedom[3].In materials without magnetic responses,the Brewster effect exclusively applies to transverse-magnetic(TM,or p-wave polarization)waves[4].

关键词： materials 布鲁斯 effect