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PrivBV:Distance-Aware Encoding for Distributed Data with Local Differential Privacy

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Tsinghua Science and Technology 2022年第2期27卷 412-421页

作者： lin sun Guolou Ping Xiaojun Ye School of Software Tsinghua UniversityBeijing 100084China

Recently,local differential privacy(LDP)has been used as the de facto standard for data sharing and analyzing with high-level privacy *** LDP-based mechanisms mainly focus on learning statistical information about the entire population from sensitive *** the first time in the literature,we use LDP for distance estimation between distributed data to support more complicated data ***,we propose PrivBV—a locally differentially private bit vector mechanism with a distance-aware property in the anonymized *** also present an optimization strategy for reducing privacy leakage in the high-dimensional *** distance-aware property of PrivBV brings new insights into complicated data analysis in distributed *** study cases,we show the feasibility of applying PrivBV to privacy-preserving record linkage and non-interactive *** analysis and experimental results demonstrate the effectiveness of the proposed scheme.

关键词： local differential privacy privacy-preserving data publishing non-interactive clustering

A fast, accurate and dense feature matching algorithm for aerial images

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Journal of Systems Engineering and Electronics 2020年第6期31卷 1128-1139页

作者： LI Ying GONG Guanghong sun lin School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

Three-dimensional(3D)reconstruction based on aerial images has broad prospects,and feature matching is an important step of ***,for high-resolution aerial images,there are usually problems such as long time,mismatching and sparse feature pairs using traditional ***,an algorithm is proposed to realize fast,accurate and dense feature *** algorithm consists of four ***,we achieve a balance between the feature matching time and the number of matching pairs by appropriately reducing the image ***,to realize further screening of the mismatches,a feature screening algorithm based on similarity judgment or local optimization is ***,to make the algorithm more widely applicable,we combine the results of different algorithms to get dense ***,all matching feature pairs in the low-resolution images are restored to the original *** between the original algorithms and our algorithm show that the proposed algorithm can effectively reduce the matching time,screen out the mismatches,and improve the number of matches.

关键词： feature matching feature screening feature fusion aerial image three-dimensional(3D)reconstruction

Coalitional game-based WiFi offloading algorithm in heterogeneous networks

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The Journal of China Universities of Posts and Telecommunications 2019年第4期26卷 25-35页

作者： sun lin Zhu Qi Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China Engineering Research Center of Health Service System Based on Ubiquitous Wireless Networks Nanjing University of Posts and TelecommunicationsMinistry of EducationNanjing 210003China

Aiming at the coexistence of cellular network and wireless fidelity(WiFi)network,a coalitional game-based WiFi offloading algorithm in heterogeneous networks is ***,this paper defines the user fairness utility function that comprehensively considers the user communication rate,cost and ***,the coalitional game model including two types of coalitions is *** control the transfer of users among coalitions,a coalition transfer criterion that simultaneously improves the user's individual utility and the total system utility is *** addition,this paper presents a channel allocation scheme that ensures full utilization of system resources to maximize the total utility of the *** simulation results show that the proposed offloading algorithm can reasonably utilize the resources of cellular network and WiFi network,and improve the utility of users and system.

关键词： WiFi offloading fairness coalitional game resource allocation

A novel ternary JK flip-flop using the resonant tunneling diode literal circuit

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第12期13卷 944-950页

作者： Mi lin ling-ling sun School of Electronics and Information Hangzhou Dianzi University Hangzhou 310018 China

A literal circuit with a three-track-output structure is presented based on resonant tunneling diodes(RTDs).It can be transformed conveniently into a single-track-output structure according to the definition and properties of the literal operation.A ternary resonant tunneling JK flip-flop is created based on the RTD literal circuit and the module-3 operation,and the JK flip-flop also has two optional types of output *** design of the ternary RTD JK flip-flop is verified by *** RTD literal circuit is the key design component for achieving various types of multi-valued logic(MVL) *** can be converted into ternary D and JK flip-flops,and the ternary JK flip-flop can also be converted simply and conveniently into ternary D and ternary T flip-flops when the input signals satisfy certain logical *** these types of flip-flops can be realized using the traditional Karnaugh maps combined with the literal and module-3 *** approach offers a novel design method for MVL resonant tunneling flip-flop circuits.

关键词： Resonant tunneling diode(RTD) Ternary logic Literal circuit Module-3 operation JK flip-flop

Dynamic responses of a piezoelectric cantilever plate under high-low excitations

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Acta Mechanica Sinica 2020年第1期36卷 234-244页

作者： Xiangying Guo Shuaibo Wang lin sun Dongxing Cao College of Mechanical Engineering Beijing University of TechnologyBeijing100124China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures Beijing100124China School of Mechanical Engineering Liaoning Shihua UniversityFushun113001China

In this paper,the nonlinear dynamic responses of a piezoelectric cantilever plate near the first-order and second-order natural frequencies under the action of electromechanical coupling are studied by experiments and finite element(FE)*** influence of different excitation frequencies on the dynamical characteristics of piezoelectric cantilever plates is analyzed with the fixed excitation ***,an experimental setup is built,including a carbon fiber cantilever plate attached to a macro fiber composite(MFC)***,the electromechanical coupling excitations are subjected to the plate with different frequencies,which are chosen near the first and second-order natural frequencies of the *** piezoelectric cantilever plate has periodical motions under a lower frequency excitation,and the motions of the plate become more complex after another high frequency excitation added in the physical *** experimental results show that the motion of the piezoelectric cantilever plate changes from stable to unstable with high-low coupled resonant *** last,the FE study is carried out to compare and verify the experimental results and the effects of isotropic and orthotropic materials on the accuracy of natural frequencies results are also compared.

关键词： Macro fiber composite Piezoelectric cantilever plate Dynamics Electromechanical coupling

Nonlinear Dynamics of Composite Microsheet with Graphene Skins in Non-uniform Thermal Field

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Acta Mechanica Solida Sinica 2020年第5期33卷 707-718页

作者： Xiangying Guo Pan Jiang lin sun Dongxing Cao College of Mechanical Engineering Beijing University of TechnologyBeijing100124China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures Beijing100124China School of Mechanical Engineering Liaoning Shihua UniversityFushun113001China

The effects of different parameters on the nonlinear dynamic characteristics of macrofiber composite(MFC)microsheet with graphene(GP)skin under non-uniform thermal field are ***,the physical parameters of the MFC–GP structure are calculated by the mixing rule,and the constitutive equations of the structure are set up by employing the Eringen *** nonlinear dynamic equations of the microsheet are obtained by using Hamilton’s ***,the heat conduction equations of the microsheet are considered,adopting Green and Naghdi’s generalized thermoelasticity *** to the Galerkin weighted residual method,the thermoelasticity coupling equations of the structure are ***,the influence of the positive piezoelectric effect of GP and MFC on the vibration response of the structure is also *** nonlinear dynamic governing equations including displacement,coupled thermoelasticity,and electricity field are discretized by the Galerkin *** effects of non-local parameter,volume fraction of GP,and thermal and electricity coupling coefficients on structural dynamic behavior are discussed in the numerical simulation.

关键词： MFC-GP microsheet Non-uniform thermal field Nonlocal parameter Nonlinear dynamic responses

Spectral clustering eigenvector selection of hyperspectral image based on the coincidence degree of data distribution

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International Journal of Digital Earth 2023年第1期16卷 3489-3512页

作者： Zhongliang Ren Qiuping Zhai lin sun College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdaoPeople’s Republic of China Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection School of Resource and Environmental SciencesLinyi UniversityPeople’s Republic of China

Spectral clustering is a well-regarded subspace clustering algorithm that exhibits outstanding performance in hyperspectral image classification through eigenvalue decomposition of the Laplacian ***,its classification accuracy is severely limited by the selected eigenvectors,and the commonly used eigenvectors not only fail to guarantee the inclusion of detailed discriminative information,but also have high computational *** address these challenges,we proposed an intuitive eigenvector selection method based on the coincidence degree of data distribution(CDES).First,the clustering result of improved k-means,which can well reflect the spatial distribution of various types was used as the reference ***,the adjusted Rand index and adjusted mutual information were calculated to assess the data distribution consistency between each eigenvector and the reference ***,the eigenvectors with high coincidence degrees were selected for clustering.A case study on hyperspectral mineral mapping demonstrated that the mapping accuracies of CDES are approximately 56.3%,15.5%,and 10.5%higher than those of the commonly used top,high entropy,and high relevance eigenvectors,and CDES can save more than 99%of the eigenvector selection ***,due to the unsupervised nature of k-means,CDES provides a novel solution for autonomous feature selection of hyperspectral images.

关键词： Eigenvector selection spectral clustering coincidence degree of data distribution hyperspectral mineral mapping

Two-Stage Stochastic Variational Inequalities: Theory, Algorithms and Applications

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Journal of the Operations Research Society of China 2021年第1期9卷 1-32页

作者： Hai-lin sun Xiao-Jun Chen School of Mathematical Sciences Jiangsu Key Laboratory for NSL SCSNanjing Normal UniversityNanjing 210023China Department of Applied Mathematics The Hong Kong Polytechnic UniversityHong KongChina

The stochastic variational inequality(SVI)provides a unified form of optimality con-ditions of stochastic optimization and stochastic games which have wide applications in science,engineering,economics and *** the recent two decades,one-stage SVI has been studied extensively and widely used in modeling equilibrium problems under ***,the recently proposed two-stage SVI and multistage SVI can be applied to the case when the decision makers want to make decisions at different stages in a stochastic *** two-stage SVI is a foundation of multistage SVI,which is to find a pair of“here-and-now”solution and“wait-and-see”*** paper provides a survey of recent developments in analysis,algorithms and applications of the two-stage SVI.

关键词： Two-stage stochastic variational inequality Two-stagestochastic complementary problem Two-stage stochastic games

Baseflow Characteristics in Alpine Rivers-a Multicatchment Analysis in Northwest China

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Journal of Mountain Science 2015年第3期12卷 614-625页

作者： GAN Rong sun lin LUO Yi Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences University of Chinese Academy of Sciences

As a component of streamflow, baseflow is critical for regulating seasonal distribution of river fows and stabilizing water supplies. Water resources in the arid area of Northwest China are mainly from multiple catchments in the alpine that could be influenced by varieties of climatic, land cover, soil and geological factors. While numerous studies have been done on streamflow, systematic analysis of baseflow in the alpine river systems is scare. Based on historical daily streamflow data and the automated digital filter method of baseflow separation, this study investigated characteristics of hydrographs of overland flow, streamflow and baseflowof river systems fed by rainfall, snowmelt, glacier melt or mixtures of these. This study also calculated the recession constants and baseflow indices of 65 river systems. While the recession constant was ***34- o.o728 with a mean of o.o18, the baseflow index was 0.27-0.79 with a mean of 0.57. Further, Spearman＇s correlation analysis showed that the baseflow index was significantly correlated with catchment climatic factors （e.g., precipitation and temperature）, topographic factors （e.g., elevation and slope） and aquifer properties represented by the recession constant. Multiple regression analysis indicated that the factors explained 65% of the variability of baseflow index in the studv area.

关键词： Baseflow index Recession constant Snowmelt Glacier melt Streamflow