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Neural Dynamics for Distributed Collaborative Control of Manipulators With Time Delays

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IEEE/CAA Journal of Automatica Sinica 2022年第5期9卷 854-863页

作者： long jin Xin Zheng Xin Luo School of Information Science and Engineering Lanzhou UniversityLanzhou 730000 IEEE State Key Laboratory of Integrated Services Networks Xidian UniversityXi’an 710071China School of Computer Science and Technology Chongqing University of Posts and TelecommunicationsChongqing 400065 Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China

Time-delay phenomena extensively exist in practical systems,e.g.,multi-agent systems,bringing negative impacts on their *** work analyzes a collaborative control problem of redundant manipulators with time delays and proposes a time-delayed and distributed neural dynamics *** assumptions that the network topology is fixed and connected and the existing maximal time delay is no more than a threshold value,it is proved that all manipulators in the distributed network are able to reach a desired *** proposed distributed scheme with time delays considered is converted into a time-variant optimization problem,and a neural dynamics solver is designed to solve it ***,the proposed neural dynamics solver is proved to be stable,convergent and ***,the allowable threshold value of time delay that ensures the proposed scheme’s stability is *** examples and comparisons are provided to intuitively prove the validity of the proposed neural dynamics scheme and solver.

关键词： Distributed collaborative control neural dynamics redundancy resolution repetitive motion planning(RMP) time delay

Modeling and Analysis of Matthew Effect Under Switching Social Networks via Distributed Competition

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IEEE/CAA Journal of Automatica Sinica 2022年第7期9卷 1311-1314页

作者： Mei Liu Suibing Li long jin School of Information Science and Engineering Lanzhou UniversityLanzhou 730000 State Key Laboratory of Tibetan Intelligent Information Processing and Application Xining 810016China IEEE

Dear editor,This letter models and analyzes the Matthew effect under switching social networks via distributed competition.A competitive strategy is leveraged to trace the evolution of individuals in social systems under the Matthew *** addition,a consensus filter is utilized to decentralize the model with undirected graphs used to describe the interactions among individuals in social ***,a term is added to the dynamic consensus filter to compensate for the influence of the switching of communication networks on the *** this letter,the convergence of the proposed Matthew effect model is theoretically proved,and simulative experiments are conducted to verify the availability of the *** particular,this letter points out the state and evolution of each individual in social systems with distributed competition,and the influence of the social environment on the development of individuals is also intuitively displayed.

关键词： effect. letter intuitive

SP3-Hybridization Feature of Ag4 Superatom in Superatomic Molecules

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Chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： Li-juan Yan long-jiu Cheng jin-long Yang Hefei National Laboratory of Physical Science at the Microscale University of Science and Technology of China Hefei 230026 China Department of Chemistry Anhui University Hefei 230601 China Hefei National Laboratory of Physical Science at the Microscale University of Science and Technology of China Hefei 230026 ChinaSynergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China

Analogous to atoms, superatoms can be used as building blocks to compose molecules and materials. To demonstrate this idea, the possibility of using tetrahedral Ag4 cluster to form a series of superatomic molecules Ag4X4 (X=H, Li, Na, K, Cu, Ag, Au and F, Cl, Br) is discussed. Based on the super valence bond model, a tetrahedral Ag4 cluster can be viewed as a 4-electron superatom, which can mimic a sp3 hybridization C atom. By comparison of the representative superatomic molecules Ag4X4 (X=Au, Cl) with the corresponding simple molecules CX4 (X=H, Cl), the similarities in terms of chemical bonding patterns and molecular orbitals (MOs) are conspicuous. Energy calculations predict that the Ag4 superatom can bind with all the involved ligands. Furthermore, the stabilities of superatomic molecules are enhanced by the large gaps of the highest occupied molecular orbital and the lowest unoccupied molecular orbital (HOMO-LUMO gaps) and high aromaticity. Our studies may find applications in assembling materials with superatoms.

关键词： Superatom Magic numbers Super valence bond Binding energy Aromaticity

Gradient-Based Differential kWTA Network With Application to Competitive Coordination of Multiple Robots

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IEEE/CAA Journal of Automatica Sinica 2022年第8期9卷 1452-1463页

作者： Mei Liu Xiaoyan Zhang Mingsheng Shang long jin School of Information Science and Engineering Lanzhou UniversityLanzhou 730000 State Key Laboratory of Tibetan Intelligent Information Processing and Application Xining 810016China Chongqing Key Laboratory of Big Data and Intelligent Computing Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China Shenzhen Research Institute Lanzhou UniversityShenzhen 518063China

Aiming at the k-winners-take-all(kWTA)operation,this paper proposes a gradient-based differential kWTA(GDk WTA)*** obtaining the network,theorems and related proofs are provided to guarantee the exponential convergence and noise resistance of the proposed GD-kWTA ***,numerical simulations are conducted to substantiate the preferable performance of the proposed network as compared with the traditional ***,the GD-k WTA network,backed with a consensus filter,is utilized as a robust control scheme for modeling the competition behavior in the multi-robot coordination,thereby further demonstrating its effectiveness and feasibility.

关键词： Consensus filter k-winners-take-all(kWTA) multirobot coordination noise resistance

Applications of An Eddy-Viscosity Eliminator Based on Sigmoid Functions in Reynolds-Averaged Navier-Stokes Simulations of Sloshing Flow

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China Ocean Engineering 2020年第4期34卷 463-474页

作者： LI jin-long YOU Yun-xiang CHEN Ke State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Yazhou Bay Institute of Deepsea Technology Shanghai Jiao Tong UniversitySanya 572000China

Reynolds-averaged Navier-Stokes(RANS)turbulence modeling can lead to the excessive turbulence level around the interface in two-phase flow,which causes the unphysical motion of the interface in sloshing *** order to avoid the unphysical motion of the interface,a novel eddy-viscosity eliminator based on sigmoid functions is designed to reduce the excessive turbulence level,and the eddy-viscosity eliminator based on polynomials is extracted from the cavitation *** elevations by combining the eddy-viscosity eliminators and classical two-equation closure models are compared with the experiments,the ones by using the adaptive asymptotic model(AAM)and the ones by using the modified two-equation closure *** root-mean-squared error(RMSE)is introduced to quantify the accuracies of surface elevations and the *** relation between the turbulence level in the transition layer and RMSEs of surface elevations is ***,the parametric analysis of the eddy-viscosity eliminators is carried *** studies suggest that(1)the excessive turbulence level in the transition layer around the interface has a significant influence on the accuracies of surface elevations and the forces;(2)the eddy-viscosity eliminators can effectively reduce the excessive turbulence level in the transition layer to avoid the unphysical motion of the interface;(3)the k-ωSST model combined with the eddy-viscosity eliminators is appropriate for predicting surface elevations and forces in RANS simulations of sloshing flow.

关键词： sloshing excessive turbulence level eddy-viscosity eliminator sigmoid function the unphysical motion of the interface

Fiber laser technologies for photoacoustic microscopy

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Visual Computing for Industry,Biomedicine,and Art 2021年第1期4卷 91-103页

作者： long jin Yizhi Liang Guangdong Provincial Key Laboratory of Fiber Optic Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China

Fiber laser technology has experienced a rapid growth over the past decade owing to increased applications in precision measurement and optical testing,medical care,and industrial applications,including laser welding,cleaning,and manufacturing.A fiber laser can output laser pulses with high energy,a high repetition rate,a controllable wavelength,low noise,and good beam quality,making it applicable in photoacoustic ***,recent developments in fiber-laser-based photoacoustic microscopy(PAM)are *** PAM can be used to image oxygen saturation or lipid-rich biological tissues by applying a Q-switched fiber laser,a stimulated Raman scattering-based laser source,or a fiber-based supercontinuum source for photoacoustic *** can also incorporate a single-mode fiber laser cavity as a high-sensitivity ultrasound sensor by measuring the acoustically induced lasing-frequency *** of their small size and high flexibility,compact head-mounted,wearable,or hand-held imaging modalities and better photoacoustic endoscopes can be enabled using fiber-laser-based PAM.

关键词： Fiber lasers Fiber sensors Photoacoustic imaging Photoacoustic microscopy

Tandem intramolecular Diels–Alder/retro-Diels–Alder cycloaddition of 2H-chromen-2-one as dienes with the expulsion of CO_2

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Chinese Chemical Letters 2016年第9期27卷 1537-1540页

作者： Jian Zhang jin-long Wu Laboratary of Asymmetry Catalysis and synthesis Department of Chemistry Zhejiang University Hangzhou 310027 China

To study the intramolecular Diels-Alder cycloadditon of 2H-chromen-2-one as a diene, a series of chiral N-allyl-N-benzylamides that contain a 2H-chrornen-2-one moiety were designed for the synthesis of benzo[f]isoindol-1-ones via an intrarnolecular Diels-Alder and a subsequent retro-Diels-Alder cycloaddition with the expulsion of CO2. Both the yield （80%-89%） and absolute stereocontrol of the tandem reaction were high when an electron-withdrawing group was attached to the dienophile. The double bond in the styrene substructure remained in the products could be further derivatized by dihydroxylation.

关键词： 2H-Chromen-2-one Intramolecular Diels-Alder Retro-Diels-Alder Benzo[J]isoindol-1 -one Dihydroxylation

Simulation of the continuous casting process in a mold of free-cutting steel 38MnVS based on a MiLE method

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International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 562-569页

作者： Fu-mingWang Yun-jin Xia jin-long Wang Guo-zhong Li School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Key Lab of the Ministry of Education of China for Ecologic and Recycle Metallurgy University of Science and Technology Beijing Beijing 100083 China Jiangyin Xingcheng Iron and Steel Co. Ltd. Jiangyin 214429 China

A new method called mixed Lagrangian and Eulerian （MiLE） method was used to simulate the continuous casting process in a mold of free-cutting steel *** simulation results are basically in agreement with experimental data in the literature,achieving the three-dimensional visualization of temperature distribution,melt flow,shell thickness,and stress distribution of blooms in a *** is shown that the flow velocity of steel melt becomes smaller gradually as the casting *** the flow reaches a certain depth,two types of flow patterns can be observed in the upper zone of the *** first flow pattern is to flow downwards,and the second one is to flow upwards to the *** corner temperature is higher,and the thickness is thinner than those in the *** effective stress in the corner area is much bigger than that in the mid-face,indicating that the corner area is the dangerous zone of cracking.

关键词： free-cutting steel melt flow continuous casting computer simulation

On Graphs with Cut Vertices and Cut Edges

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Acta Mathematica Sinica,English Series 2014年第3期30卷 539-546页

作者： Kun Fu FANG jin long SHU Faculty of Science Huzhou Teachers College Department of Mathematics East China Normal University

Let G（n,k,t） be a set of graphs with n vertices,k cut edges and t cut *** this paper,we classify these graphs in G（n,k,t） according to cut vertices,and characterize the extremal graphs with the largest spectral ra... 详细信息

关键词： Spectral radius extremal graph cut vertex cut edge