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PREVENTING RUMOR SPREADING ON SMALL-WORLD NETWORKS

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Journal of Systems Science & Complexity 2011年第3期24卷 449-456页

作者： jinyu HUANG xiaogang jin AI Institute School of Computer Science Zhejiang University Hangzhou 310027 China Ningbo Institute of Technology Zhejiang University Ningbo 315100 China

Since the spreading of harmful rumors can deeply endanger a society, it is valuable to investigate strategies that can efficiently prevent hazardous rumor propagation. To conduct this investigation, the authors modify the SIR model to describe rumor propagation on networks, and apply two major immunization strategies, namely, the random immunization and the targeted immunization to the rumor model on a small-world network. The authors find that when the average degree of the network is small, both two strategies are effective and when the average degree is large, neither strategy is efficient in preventing rumor propagation. In the latter case, the authors propose a new strategy by decreasing the credibility of the rumor and applying either the random or the targeted immunization at the same time. Numerical simulations indicate that this strategy is effective in preventing rumor spreading on the small-world network with large average degree.

关键词： Complex networks credibility immunization strategy rumor propagation

Efficient polygonization of tree trunks modeled by convolution surfaces

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Science China(Information Sciences) 2013年第3期56卷 48-59页

作者： ZHU XiaoQiang GUO XueKun jin xiaogang State Key Laboratory of CAD & CG Zhejiang University

We present an efficient polygonization approach for tree trunks modeled by line skeleton-based convolution surfaces.A quad-dominated non-convex bounding polyhedron is firstly created along the skeleton,which is then tetrahedralized and subdivided into the pre-defined *** that,the iso-surface within each tetrahedron is extracted using marching *** algorithm can generate polygons with adaptive edge lengths according to the thickness of the *** addition,we present an efficient CUDA-based parallel algorithm utilizing the high parallelism of the tetrahedron subdivision,the potential field calculation,and the iso-surface extraction.

关键词： trunk modeling skeleton-based modeling convolution surface tetrahedral subdivision CUDA

Experimental and numerical studies of Ca(OH)_(2)/CaO dehydration process in a fixed-bed reactor for thermochemical energy storage

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Chinese Journal of Chemical Engineering 2023年第10期62卷 11-20页

作者： Zhihao Zhang Danyang Song Hengxing Bao Xiang Ling xiaogang jin School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816China

The Ca(OH)_(2)/CaO thermochemical energy storage(TCES)system based on calcium looping has received extensive attention owing to its high energy storage density,prolonged energy storage time,and environmental *** heat storage process of the Ca(OH)_(2)/CaO TCES system in a mixed heating reactor was evaluated in this study,by employing a combination of direct and indirect heating *** dehydration process was studied experimentally,and a numerical model was established and verified based on the experimental *** dehydration behavior of 500 g of Ca(OH)_(2) powder was investigated in a fixed-bed reactor with mixed *** experimental and simulation results indicated that mixed heating causes combined centripetal and horizontal *** input is the main limiting factor in the heat storage process,because the radial advance of the reaction is hindered by the low thermal conductivity of the solid reactant *** transmission partitions were added to enhance the performance of the *** performance of the modified reactor was compared with that of a conventional *** radial heat transmission partitions in the modified reactor effectively enhance the energy storage rate and reduce the reaction time by 59.5%compared with the reactor without partitions.

关键词： Thermochemical energy storage Reactor Ca(OH)_(2)/CaO Dehydration Experiment research Numerical simulation

Flow characteristics simulation of spiral coil reactor used in the thermochemical energy storage system

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Chinese Journal of Chemical Engineering 2022年第2期35卷 364-379页

作者： Xiaoyi Chen Danyang Song Dong Zhang xiaogang jin Xiang Ling Dongren Liu School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816China School of Mechanical Engineering Shanghai Institute of TechnologyShanghai 201418China Mechanical Engineering College Yangzhou UniversityYangzhou 225009China

According to environmental and energy issues,renewable energy has been vigorously *** solar power is widely used in many areas but it is limited by the weather conditions and cannot work *** storage is a considerable solution for this problem and thermochemical energy storage is the most promising way because of its great energy density and ***,this technology is not mature enough to be applied to the *** reactor is an important component in the thermochemical energy storage system where the charging and discharging process *** this paper,a spiral coil is proposed and used as a reactor in the thermochemical energy storage *** advantages of the spiral coil include simple structure,small volume,and so *** investigate the flow characteristics,the simulation was carried out based on energy-minimization multi-scale model(EMMS)and Eulerian two-phase ***_(3) particles were chosen as the *** distribution was shown in the *** gas initial velocity was set to 2 m·s^(-1),3 m·s^(-1),and 4 m·s^(-1).When the particles flowed in the coil,gravity,centrifugal force and drag force influenced their *** the Reynold numbers increasing,centrifugal and drag force got *** phenomenon existed in the coil and results showed with the gas velocity increasing,accumulation moved from the bottom to the outer wall of the ***,the accumulation phenomenon was stabilized whenφ>720°.Also due to the centrifugal force,a secondary flow formed,which means solid particles moved from the inside wall to the outside *** secondary flow could promote turbulence and mixing of particles and *** addition,when the particle volume fraction is reduced from 0.2 to 0.1,the accumulation at the bottom of the coil decreases,and the unevenness of the velocity distribution becomes larger.

关键词： Thermochemical energy storage CaCO3/CaO Reactors Simulation Two-phase flow Energy-minimization multi-scale model(EMMS)

Example-based large-scale marine scene authoring using Wang Cubes

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Visual Informatics 2022年第3期6卷 23-34页

作者： Siyuan Zhu Xinjie Wang Ming Wang Yucheng Wang Zhiqiang Wei Bo Yin xiaogang jin Ocean University of China Shandong266100China Pilot National Laboratory for Marine Science and Technology(Qingdao) Shandong266237China Zhejiang University Zhejiang310058China

Virtual marine scene authoring plays an important role in generating large-scale 3D scenes and it has a wide range of applications in computer animation and *** marine scene authoring methods either produce periodic patterns or generate unnatural group distributions when tiling marine entities such as schools of fish and groups of *** this end,we propose a new large-scale marine scene authoring method based on real examples in order to create more natural and realistic *** method first extracts the distribution of multiple marine entities from real images to create Octahedral Blocks,and then we use a modified Wang Cubes algorithm to quickly tile the 3D marine *** a result,our method is able to generate aperiodic tiling results with diverse distributions of density and orientation of *** validate the effectiveness of our method through intensive comparative *** study results show that our method can generate satisfactory results which are in accord with human preferences.

关键词： Wang Cubes Marine scene authoring Virtual environments

Character Modelling with Sketches and ODE-Based Shape Creation

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Numerical Mathematics(Theory,Methods and Applications) 2023年第3期16卷 720-751页

作者： Ouwen Li Haibin Fu Shaojun Bian Xiaosong Yang xiaogang jin Andres Iglesias Algirdas Noreika Lihua You Jian Jun Zhang National Centre for Computer Animation Bournemouth UniversityUnited Kingdom State Key Lab of CAD&CG Zhejiang UniversityChina Department of Applied Mathematics and Computational Sciences University of CantabriaSpain Department of Information Science Toho UniversityJapan Indeform Ltd Lithuania

Character models have enormous applications in *** creation of detailed character models is an important *** paper proposes a new and easy-to-use technique to quickly create detailed character models from *** proposed technique consists of two main components:primitive deformer and shape *** this technique,2D silhouette contours of a character model are drawn or extracted from an image or ***,proper geometric primitives are selected and aligned with the corresponding 2D silhouette *** that,a primitive deformer is used to create a base mesh and three shape generators are used to add 3D details to the base *** primitive deformer and three shape generators are developed from ODE-driven *** primitive deformer deforms the aligned geometric primitives to exactly match the 2D silhouette contours in one view plane and obtains a base mesh of a character model consisting of deformed *** shape generators are used to add 3D details to the base mesh by creating local 3D *** experimental results demonstrate that the new technique can quickly create detailed 3D character models from sketches with few manual *** new technique is physics-based and easy to learn and use.

关键词： Sketch-based character modelling shape generators ordinary differential equations finite difference solution

Copy-and-paste operation of planar polygonal shapes

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Progress in Natural Science:Materials International 2007年第7期17卷 859-866页

作者： Yang Wenwu Feng Jieqing Huang Shengsheng jin xiaogang(State Key Laboratory of CAD&CG,Zhejiang University,Hangzhou 310027,China) State Key Laboratory of CAD&CG Zhejiang University Hangzhou 310027 China

A 2D polygonal shape copy-and-paste method is proposed which is based on a multiple planar shapes blending algorithm. First sub-shapes are specified and selected,which correspond to user-defined visual features on the input *** they are copied and pasted with contribution weights to generate new shapes via a modified intrinsic 2D shape blending *** can edit the generated shape intuitively and interactively by adjusting the contribution *** proposed method fills the gap in the object modeling method- ology based on the copy-and-paste *** the static 2D copy-and-paste operation,the proposed method can also be applied to 2D metamorphosis among multiple planar shapes.

关键词： copy-and-paste 2D shape blending metamorphosis

Developing an atmospheric aging evaluation model of acrylic coatings:A semi-supervised machine learning algorithm

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1617-1627页

作者： Yiran Li Zhongheng Fu Xiangyang Yu Zhihui jin Haiyan Gong Lingwei Ma xiaogang Li Dawei Zhang Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China BRI Southeast Asia Network for Corrosion and Protection(MOE) Shunde Innovation School of University of Science and Technology BeijingFoshan 528399China

To study the atmospheric aging of acrylic coatings,a two-year aging exposure experiment was conducted in 13 representative climatic environments in *** atmospheric aging evaluation model of acrylic coatings was developed based on aging data including11 environmental factors from 567 cities.A hybrid method of random forest and Spearman correlation analysis was used to reduce the redundancy and multicollinearity of the data set by dimensionality reduction.A semi-supervised collaborative trained regression model was developed with the environmental factors as input and the low-frequency impedance modulus values of the electrochemical impedance spectra of acrylic coatings in 3.5wt%NaCl solution as *** model improves accuracy compared to supervised learning algorithms model(support vector machines model).The model provides a new method for the rapid evaluation of the aging performance of acrylic coatings,and may also serve as a reference to evaluate the aging performance of other organic coatings.

关键词： acrylic coatings coatings aging atmospheric environment machine learning

A comparative study of proliferation and osteogenic differentiation of rat adipose-derived stem cells in β-tricalcium phosphate (β-TCP), forsterite (Mg_2SiO_4 ) and clinoenstatite (MgSiO_3)

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Chinese Science Bulletin 2013年第24期58卷 3033-3042页

作者： LENG Bin jin xiaogang LIN QiuXia CHEN Lei WANG Yan DU ZhiYan LIN KaiLi CHANG Jiang GU XiaoMing WANG ChangYong Department of Implantology of People's Armed Police General Hospital Department of Advanced Interdisciplinary Studies Institute of Basic Medical Sciences and Tissue Engineering Research Center Academy of Military Medical Sciences State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences

In this study, the effects of forsterite and clinoenstatite powder extracts on the proliferation and osteogenic differentiation of rat adipose-derived stem cells (ASCs) were investigated and compared with the β-tricalcium phosphate (β-TCP) powder extracts. Methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay and live-dead staining were performed to evaluate the viability and proliferation of rat ASCs. Osteogenic differentiation of rat ASCs were assayed by alkaline phosphatase (ALP) staining and ALP activity test. The expression of osteogenic marker genes (alkaline phosphatase (ALP), runt related transcription factor 2 (Runx2), collagen type Iα1 (Col1α1), secreted phosphoprotein1 (Spp1, osteopontin), integrin binding sialoprotein (Ibsp), bone gla protein (Bglap)) were detected by real-time polymerase chain reaction (PCR). The MTT assay and the live-dead staining showed that all the three ceramics possessed good cytocompatibility with rat ASCs. Furthermore, forsterite and clinoenstatite promoted the proliferation of rat ASCs compared with β-TCP. The results of the ALP activity test and the real-time PCR demonstrated that forsterite and clinoenstatite promoted the osteogenic differentiation of rat ASCs. These results suggested that forsterite and clinoenstatite are bioactive ceramics that may be used for preparation of bone tissue engineering (BTE) scaffolds.

关键词：脂肪干细胞成骨分化细胞增殖镁橄榄石 TCP相磷酸三钙 Mg2SiO4 MgSiO3