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Hierarchical Layout Deduction for Furniture Model Retrieval

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Chinese Journal of Electronics 2018年第2期27卷 359-366页

作者： PAN Wanbin LI Shi WANG Yigang JI Zhongping School of Media and Design Hangzhou Dianzi University

3D CAD model retrieval plays a fundamental role in producing impressive and innovative designs easier and faster. However, after decades of efforts, effective retrieval approach for furniture models is still rare. A novel retrieval approach for furniture models, based on a hierarchical layout deduction, is proposed according to the common structure characteristics of furniture. In order to discriminate furniture models effectively both on topological, geometrical and semantic layers, special components for furniture model are defined and a multiresolution furniture model descriptor, attributed hierarchy layout graph,is adopted. To promote the retrieval efficiency, a filtering process, based on random walks method, is applied. Based on hierarchy graph matching, the similarity between two furniture models, is determined. A prototype system is implemented to verify the proposed approach effectiveness.

关键词： Furniture model retrieval Hierarchy layout deduction Assembly model retrieval 3D CAD model

Local structure-preserving methods for the generalized Rosenau-RLW-KdV equation with power law nonlinearity

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Chinese Physics B 2017年第10期26卷 7-11页

作者：蔡加祥洪旗杨斌 School of Mathematical Science Huaiyin Normal University Graduate School of China Academy of Engineering Physics

Local structure-preserving algorithms including multi-symplectic, local energy- and momentum-preserving schemes are proposed for the generalized Rosenau-RLW-KdV equation based on the multi-symplectic Hamiltonian formula of the equation. Each of the present algorithms holds a discrete conservation law in any time-space region. For the original problem subjected to appropriate boundary conditions, these algorithms will be globally conservative. Discrete fast Fourier transform makes a significant improvement to the computational efficiency of schemes. Numerical results show that the proposed algorithms have satisfactory performance in providing an accurate solution and preserving the discrete invariants.

关键词： Rosenau-type equation multi-symplectic conservation law energy conservation law structure- preserving algorithm

The interplay of diffusion and heterogeneity in nucleation of the networked Ising model

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Communications in Theoretical Physics 2021年第11期73卷 150-156页

作者： Chuansheng Shen Hanshuang Chen School of Mathematics and Physics Anqing Normal UniversityAnqing 246011China School of Physics and Optoelectronics and Engineering Anhui UniversityHefei 230601China

Nucleation underlies the dynamics of most first-order phase transitions in natural and man-made ***,most of the systems of interest are out of *** is known on the effect of nonequilibrium factors on the dynamics of ***,we use the forward flux sampling method to investigate the effect of nonequilibrium diffusion on nucleation in small-world Ising networks,wherein spins can be exchanged between nearest-neighboring *** introduce a parameterαto quantify the difference of nucleation rate with and without *** find thatαshows a nonmonotonic dependence on the rewiring probability p of small-world *** particular,for different diffusion probability D,a crossover happens at p■0.17,below which the nucleation rate decreases as D increases,suggesting that the diffusion is against nucleation;while above which the nucleation rate increases with D,indicating that the diffusion is in favor of *** identifying the distinct features of nucleating clusters along the pathways for different randomness of networks,we reveal the underlying mechanism of such a nontrivial dependence.

关键词： complex networks phase transitions nucleation nonequilibrium

A Novel Class of Energy-Preserving Runge-Kutta Methods for the Korteweg-de Vries Equation

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Numerical Mathematics(Theory,Methods and Applications) 2022年第3期15卷 768-792页

作者： Yue Chen Yuezheng Gong Qi Hong Chunwu Wang Department of Mathematics Nanjing University of Aeronautics and AstronauticsNanjing 211106China key laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles(NUAA) MIITNanjing 211106China Jiangsu key laboratory for Numerical simulation of Large Scale complex systems Nanjing 210023China

In this paper,we present a quadratic auxiliary variable approach to develop a new class of energy-preserving Runge-Kutta methods for the Korteweg-de Vries *** quadratic auxiliary variable approach is first proposed to reformulate the original model into an equivalent system,which transforms the energy conservation law of the Korteweg-de Vries equation into two quadratic invariants of the reformulated *** the symplectic Runge-Kutta methods are directly employed for the reformulated model to arrive at a new kind of time semi-discrete schemes for the original *** consistent initial conditions,the proposed methods are rigorously proved to maintain the original energy conservation law of the Korteweg-de Vries *** addition,the Fourier pseudo-spectral method is used for spatial discretization,resulting in fully discrete energy-preserving *** implement the proposed methods effectively,we present a very efficient iterative technique,which not only greatly saves the calculation cost,but also achieves the purpose of practically preserving *** numerical results are addressed to confirm the expected order of accuracy,conservative property and efficiency of the proposed algorithms.

关键词： Quadratic auxiliary variable approach symplectic Runge-Kutta scheme energypreserving algorithm Fourier pseudo-spectral method

Arbitrarily High-Order Energy-Preserving Schemes for the Camassa-Holm Equation Based on the Quadratic Auxiliary Variable Approach

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Advances in Applied Mathematics and Mechanics 2023年第5期15卷 1233-1255页

作者： Yuezheng Gong Qi Hong Chunwu Wang Yushun Wang School of Mathematics Nanjing University of Aeronautics and AstronauticsNanjingJiangsu 211106China key laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles(NUAA) MIITNanjingJiangsu 211106China Jiangsu key laboratory for Numerical simulation of Large Scale complex systems School of Mathematical SciencesNanjing Normal UniversityNanjingJiangsu 210023China

In this paper,we present a quadratic auxiliary variable(QAV)technique to develop a novel class of arbitrarily high-order energy-preserving algorithms for the Camassa-Holm *** QAV approach is first utilized to transform the original equation into a reformulated QAV system with a consistent initial *** the reformulated QAV system is discretized by applying the Fourier pseudo-spectral method in space and the symplectic Runge-Kutta methods in time,which arrives at a class of fully discrete *** the consistent initial condition,they can be rewritten as a new fully discrete system by eliminating the introduced auxiliary variable,which is rigorously proved to be energy-preserving and *** numerical experiments are conducted to confirm the expected order of accuracy,conservative property and efficiency of the proposed *** presented numerical strategy makes it possible to directly apply a special class of Runge-Kutta methods to develop energy-preserving algorithms for a general conservative system with any polynomial energy.

关键词： Camassa-Holm equation quadratic auxiliary variable high-order energy-preserving schemes symplectic Runge-Kutta methods

A Physics-Informed Structure-Preserving Numerical Scheme for the Phase-Field Hydrodynamic Model of Ternary Fluid Flows

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Numerical Mathematics(Theory,Methods and Applications) 2023年第3期16卷 565-596页

作者： Qi Hong Yuezheng Gong Jia Zhao School of Mathematics Nanjing University of Aeronautics and Astronautics/Key Laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles(NUAA)MIITNanjing 211106China Department of Mathematics and Statistics Utah State UniversityLoganUT84322USA

Phase-field models are widely used in studying multiphase flow *** the complexity and strong nonlinearity,designing accurate,efficient,and stable numerical algorithms to solve these models has been an active research field for *** paper proposes a novel numerical scheme to solve a highly cited and used phase field hydrodynamic model for simulating ternary phase fluid *** main novelty is the introduction of a supplementary variable to reformulate the original problem into a constrained optimization *** reformulation leads to several advantages for our proposed numerical algorithms compared with many existing numerical techniques for solving this ***,the developed schemes allow more straightforward calculations for the hydrodynamic phase-field models by solving a few decoupled Helmholtz or Poisson-type systems with a constant precomputable coefficient matrix,remarkably reducing the computational ***,the numerical schemes can maintain mass conservation and energy dissipation at the discrete ***,the developed scheme based on the secondorder backward difference formula respects the original energy dissipation law that differs from many existing schemes,such as the IEQ,SAV,and Lagrange multiplier approaches for which a modified energy dissipation law is ***,rigorous proof of energy stability and practical implementation strategies are *** conduct adequate 2D and 3D numerical tests to demonstrate the proposed schemes’accuracy and effectiveness.

关键词： Energy stable phase field Cahn-Hilliard-Navier-Stokes supplementary variable method

Special Issue for the 14th Global Chinese Chemical Engineering Symposium

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Frontiers of Chemical Science and Engineering 2023年第10期17卷 1321-1322页

作者： Jesse Zhu Junwu Wang Particle Technology Research Centre Western UniversityLondonOntario N6A 5B9Canada State key laboratory of Multiphase complex systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The Global Chinese Chemical Engineering Symposium(GCCES)is a prestigious and world-wide platform for the communication and academic exchange of chemical science and *** special issue is a collection of the keynote lectures presented by the winners of Future Chemical Engineering Scholars,the Global Award for Outstanding Young Female Chemical Engineers,and the International Award for Outstanding Young Chemical Engineers,selected by the International Scientific Committee of the GCCES.

关键词： engineering. Global Engineers

Special Issue for the Future Chemical Engineering Scholars of Global Chinese Chemical Engineering Symposium

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Frontiers of Chemical Science and Engineering 2022年第6期16卷 775-776页

The Global Chinese Chemical Engineering Symposium(GCCES)is a prestigious and world-wide platform for the communication and academic exchange of chemical science and *** addition to its key roles in international academic exchanges and collaborations,as well as cross-disciplinary integration and industrial-academic co-operation,the GCCES strongly promotes the professional development of young Chinese chemical engineers and scientists by founding series of special forums for the winners of the Excellent Postgraduate Academic Forum,the Young Researchers Forum,the Future Chemical Engineering Scholars,and the International Award for Outstanding Young Chemical Engineers.

关键词： founding Global Scholars

A Knowledge Graph-Based Deep Learning Framework for Efficient Content Similarity Search of Sustainable Development Goals Data

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Data Intelligence 2023年第3期5卷 663-684页

作者： Irene Kilanioti George A.Papadopoulos School of Electrical and Computer Engineering National Technical University of Athens9 Heroon Polytechneiou St.Zografou Campus Athens15780Greece Department of Computer Science University of Cyprus1 University AvenueAglantziaCY-2109NicosiaCyprus

Sustainable development denotes the enhancement ofliving standards in the present without compromising future generations'*** Development Goals(SDGs)quantify the accomplishment of sustainable development and pave the way for a world worth living in for future *** can contribute to the achievement of the SDGs by guiding the actions of practitioners based on the analysis of SDG data,as intended by this *** propose a framework of algorithms based on dimensionality reduction methods with the use of Hilbert Space Filling Curves(HSFCs)in order to semantically cluster new uncategorised SDG data and novel indicators,and efficiently place them in the environment of a distributed knowledge graph ***,a framework of algorithms for insertion of new indicators and projection on the HSFC curve based on their transformer-based similarity assessment,for retrieval of indicators and loadbalancing along with an approach for data classification of entrant-indicators is ***,a thorough case study in a distributed knowledge graph environment experimentally evaluates our *** results are presented and discussed in light of theory along with the actual impact that can have for practitioners analysing SDG data,including intergovernmental organizations,government agencies and social welfare *** approach empowers SDG knowledge graphs for causal analysis,inference,and manifold interpretations of the societal implications of SDG-related actions,as data are accessed in reduced retrieval *** facilitates quicker measurement of influence of users and communities on specific goals and serves for faster distributed knowledge matching,as semantic cohesion of data is preserved.

关键词： Content similarity Distributed knowledge graphs Sustainable Development Goals Hilbert space filling curves Deep learning