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Traffic Clustering Algorithm of Urban Data Brain Based on a Hybrid-Augmented Architecture of Quantum Annealing and Brain-Inspired Cognitive Computing

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Tsinghua Science and Technology 2020年第6期25卷 813-825页

作者： Ning wang Gege Guo Baonan wang chao wang Key laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200444China State Key Laboratory of Cryptology.Beijing 100878 China Center for Quantum Computing Peng Cheng LaboratoryShenzhen 518000China

In recent years,the urbanization process has brought modernity while also causing key issues,such as traffic congestion and parking ***,cities need a more intelligent"brain"to form more intelligent and efficient transportation *** present,as a type of machine learning,the traditional clustering algorithm still has limitations.K-means algorithm is widely used to solve traffic clustering problems,but it has limitations,such as sensitivity to initial points and poor ***,based on the hybrid architecture of Quantum Annealing(QA)and brain-inspired cognitive computing,this study proposes QA and Brain-Inspired Clustering Algorithm(QABICA)to solve the problem of urban taxi-stand *** on the traffic trajectory data of Xi’an and Chengdu provided by Didi Chuxing,the clustering results of our algorithm and K-means algorithm are *** find that the average taxi-stand location bias of the final result based on QABICA is smaller than that based on K-means,and the bias of our algorithm can effectively reduce the tradition K-means bias by approximately 42%,up to approximately 83%,with higher *** algorithm is able to jump out of the local suboptimal solutions and approach the global optimum,and brain-inspired cognitive computing provides search feedback and ***,we will further consider applying our algorithm to analyze urban traffic flow,and solve traffic congestion and other key problems in intelligent transportation.

关键词： cluster analysis intelligent transportation quantum annealing and brain-inspired clustering algorithm K-means

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Motion Planning for a Cable-Driven Lower Limb Rehabilitation Robot with Movable Distal Anchor Points

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Journal of Bionic Engineering 2023年第4期20卷 1585-1596页

作者： Jinghang Li Keyi wang Yanzhuo wang chao wang College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin150001China

This article introduces a cable-driven lower limb rehabilitation robot with movable distal anchor points(M-CDLR).The traditional cable-driven parallel robots(CDPRs)control the moving platform by changing the length of cables,M-CDLR can also adjust the position of the distal anchor point when the moving platform *** M-CDLR this article proposed has gait and single-leg training modes,which correspond to the plane and space motion of the moving platform,*** introducing the system structure configuration,the generalized kinematics and dynamics of M-CDLR are *** fully constrained CDPRs can provide more stable rehabilitation training than the under-constrained one but requires more ***,a motion planning method for the movable distal anchor point of M-CDLR is proposed to realize the theoretically fully constrained with fewer *** the expected trajectory of the moving platform is obtained from the motion capture experiment,and the motion planning of M-CDLR under two training modes is *** simulation results verify the effectiveness of the proposed motion planning *** study serves as a basic theoretical study of the structure optimization and control strategy of M-CDLR.

关键词： Bionic robot Cable-driven parallel robot(CDPR) Lower limb rehabilitation robot Movable anchor point Motion planning Simulation

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Resistant effect of non-equilibrium inter-particle collisions on dense solids transport

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Particuology 2010年第6期8卷 544-548页

作者： chao Zhu Dawei wang Department of Mechanical and Industrial Engineering NewJersey Institute of Technology Newark NJ 07102 USA

There exist big gaps between measurements and modeling predictions on solids holdup and pressure drop in dense solids transport, such as those occuring in the bottom sections of gas-solids risers. The inability of closing this gap by common modeling approaches indicates certain missing and/or misrepresentation of some controlling mechanisms in modeling the transport. Previous research efforts show that the gap can not be effectively narrowed by simply modifying the drag force formulations without inclusion of the collision effect. This paper explores the origin of some controlling mechanisms that might have been overlooked in previous modeling approaches, and recommends how to make the model dense solids transport better. Our analysis shows the presence of a resistant force arising from inter-particle collision when the solids are accelerated in dense-phase transport. This may be caused by non-equilibrium collision during solids acceleration, which differs from local-equilibrium assumptions on which the current kinetic theory modeling of granular particles is based. A complete modeling of this collision-induced resistance calls for a total revision of the kinetic theory, with the inclusion of non-equilibrium collisions and offcenter collisions in dense solids transport.

关键词： Dense solids transport Inter-particle collision Non-equilibrium collisions Resistant effect

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Factors influencing particle agglomeration during solid-state sintering

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Acta Mechanica Sinica 2012年第3期28卷 711-719页

作者： chao wang Shao-Hua Chen State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of Sciences100190 BeijingChina

Discrete element method （DEM） is used to study the factors affecting agglomeration in three-dimensional copper particle systems during solid-state sintering. A new parameter is proposed to characterize agglomeration. The effects of a series of factors are studied, including particle size, size distribution, inter-particle tangential viscosity, tem- perature, initial density and initial distribution of particles on agglomeration. We find that the systems with smaller particles, broader particle size distribution, smaller viscos- ity, higher sintering temperature and smaller initial density have stronger particle agglomeration and different distribu- tions of particles induce different agglomerations. This study should be very useful for understanding the phenomenon of agglomeration and the micro-structural evolution during sin- tering and guiding sintering routes to avoid detrimental ag- glomeration.

关键词： Solid-state sintering Discrete element simula-tion. Agglomeration. Densification

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The effect of agglomerate on micro-structural evolution in solid-state sintering

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Acta Mechanica Sinica 2012年第5期28卷 1323-1330页

作者： chao wang Shao-Hua Chen State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of Sciences

Discrete element method （DEM） is used in the present paper to simulate the microstructural evolution of a planar layer of copper particles during sintering. Formation of agglomerates and the effect of their rearrangement on densification are mainly focused on. Comparing to the existing experimental observations, we find that agglomerate can form spontaneously in sintering and its rearrangement could accelerate the densification of compacts. Snapshots of numerical simulations agree qualitatively well with experimental observations. The method could be readily extended to investigate the effect of agglomerate on sintering in a three- dimensional model, which should be very useful for understanding the evolution of microstructure of sintering systems.

关键词： Solid-state sintering Discrete element method Agglomerate Densification Micro-structural evolution

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WATER QUALITY MODELING AND POLLUTION CONTROL FOR THE EASTERN ROUTE OF SOUTH TO NORTH WATER TRANSFER PROJECT IN CHINA

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Journal of Hydrodynamics 2006年第3期18卷 253-261页

作者： wang chao wang Yan-ying wang Pei-fang Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes College of Environmental Science and Engineering Hohai University Nanjing 210098 China

South to North Water Transfer Project in China is the largest project over centuries to solve the water shortage problem in vast areas of northern China. It comprises of three routes： the eastern, central and western route and this study mainly focused on the eastern route. As water quality is the key factor for the eastern route, this paper examined the main factors influencing water quality of the main route south of the Yellow River, by investigating the point source, non-point source （diffusive source） and internal source pollutions along the main eastern route and in its drainage basins, and assessing the Current water quality in the waterways. According to the complicated and combined systems of rivers and lakes in this route, one-dimensional water quantity and quality model for rivers and two-dimensional model for lakes were developed to simulate the hydrodynamic and pollutant transport processes. The numerical method and model algorithm were described. The values of model parameters were estimated by using field-monitoring data along the main route and the inverse modeling technique. Established models were employed to predict the degradations of CODMn and NH4^＋-N in the main stream, under the conditions of current pollution loads and different hydrologic conditions. Schemes were present for controlling total quantities of pollutants from point source and non-point source along the main route to secure water quality for the eastern route.

关键词： South to North Water Transfer Eastern RouteProject water quality pollution loads pollution control

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NUMERICAL SIMULATION FOR CONTAMINANTS AND WATER TRANSPORT IN SOILS

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Journal of Hydrodynamics 1996年第3期8卷 102-110页

作者： wang, chao wang, Deguan wang, Huimin Hohai Univ Nanjing China

A numerical model for solving the problems of water and contaminant transportation and transformation in variably saturated porous media was presented, which uses the finite-difference approximation to solve the advection-dispersion equation, and in which the spatial derivatives in the flow equation are approximated by central difference written about grid-block boundaries, and the time derivatives are approximated by a fully implicit backward scheme. The numerical modelling of water and contaminants mixing was used to simulate the water and contaminant movements in the unsaturated soils. The results from numerical simulations were compared with the data from tests with good agreement.

关键词： Computer simulation Environmental protection Finite difference method Mathematical models Numerical analysis Soils

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Catalytic methane removal to mitigate its environmental effect

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Science China Chemistry 2023年第4期66卷 1032-1051页

作者： chao wang Youxun Xu Junwang Tang Department of Chemical Engineering University College LondonLondon WCIE 7JEUK

Large reserve of methane,in the form of natural gas and methane hydrate,has been discovered and it has been intensively used as a fuel,or as a building block for the chemical ***,severe environmental and climatic issues caused by the leakage of methane during the production,transportation and use of methane are *** offers incentives for the catalytic removal of ***,due to the inert nature of methane molecules,the activation of methane via thermocatalysis requires harsh reaction *** high reaction temperature not only increases the capital cost but also accelerates the deactivation of catalysts due to sintering and/or *** development of robust and stable catalysts with a low operating temperature has become the focus of the research on thermocatalytic methane ***,which uses the energy of photons instead of heat to drive chemical reactions under ambient conditions,offers another approach to methane *** review will cover the development of high-efficiency catalysts for methane combustion in both thermo-and ***,the fundamental understanding of the active sites,surface chemistry and reaction pathway will also be ***,the challenges facing in the catalytic removal of methane will be summarized and potential solutions will be *** review will be of interest to researchers in the field of heterogeneous catalysis,materials design,and chemical engineering.

关键词： methane oxidation environmental remediation thermocatalysis photocatalysis fundamental understandings

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Self-corrected unsupervised domain adaptation

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Frontiers of Computer Science 2022年第5期16卷 35-43页

作者： Yunyun wang chao wang Hui XUE Songcan CHEN School of Computer Science and Engineering Nanjing University of Posts&TelecommunicationsNanjing 210046China School of Computer Science and Engineering Southeast UniversityNanjing 210096China School of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210023China

Unsupervised domain adaptation(UDA),which aims to use knowledge from a label-rich source domain to help learn unlabeled target domain,has recently attracted much *** methods mainly concentrate on source classification and distribution alignment between domains to expect the correct target *** in this paper,we attempt to learn the target prediction end to end directly,and develop a Self-corrected unsupervised domain adaptation(SCUDA)method with probabilistic label *** adopts a probabilistic label corrector to learn and correct the target labels ***,besides model parameters,those target pseudo-labels are also updated in learning and corrected by the anchor-variable,which preserves the class candidates for *** on real datasets show the competitiveness of SCUDA.

关键词： unsupervised domain adaptation adversarial Learning deep neural network pseudo-labels label corrector

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Quantum Information Transfer Based on Frequency Modes in Circuit QED

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Chinese Physics Letters 2012年第8期29卷 115-117页

作者： wang chao-Quan Laboratory of Nanophotonic Functional Materials and Devices SIPSE&LQITSouth China Normal UniversityGuangzhou 510006

We propose a scheme for implementing quantum information transfer based on frequency modes of microwave photons in a superconducting *** our proposal,quantum information can be encoded on frequency modes of microwave photons,which act as a qubit in the *** for the qubit,which is a process involving parametric frequency conversion,can be implemented by adjusting biased-dc superconducting quantum interference(SQUID).The coupling between two resonators can be controlled by tuning the frequency of the LC circuit inserted by a dc SQUID with two Josephson-junctions(2JJ-SQUID).Compared with previous ones,our work can avoid dephasing and decoherence resulting from atom *** addition,the resonator which includes multiple photons in two frequency modes can play a role of an identical atomic ensemble,which could lead to photon blockade.

关键词： SQUID quantum microwave

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