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Federated Learning Based on Data Divergence and Differential Privacy in Financial Risk Control Research

Computers, Materials & Continua 2023年第4期75卷 863-878页

作者： Mao Yuxin wang honglin School of Artificial Intelligence/School of Future Technology Nanjing University of Information Science and TechnologyNanjing210044China

In the financial sector, data are highly confidential and sensitive,and ensuring data privacy is critical. Sample fusion is the basis of horizontalfederation learning, but it is suitable only for scenarios where customershave the same format but different targets, namely for scenarios with strongfeature overlapping and weak user overlapping. To solve this limitation, thispaper proposes a federated learning-based model with local data sharing anddifferential privacy. The indexing mechanism of differential privacy is used toobtain different degrees of privacy budgets, which are applied to the gradientaccording to the contribution degree to ensure privacy without affectingaccuracy. In addition, data sharing is performed to improve the utility ofthe global model. Further, the distributed prediction model is used to predictcustomers’ loan propensity on the premise of protecting user privacy. Usingan aggregation mechanism based on federated learning can help to train themodel on distributed data without exposing local data. The proposed methodis verified by experiments, and experimental results show that for non-iiddata, the proposed method can effectively improve data accuracy and reducethe impact of sample tilt. The proposed method can be extended to edgecomputing, blockchain, and the Industrial Internet of Things (IIoT) *** theoretical analysis and experimental results show that the proposedmethod can ensure the privacy and accuracy of the federated learning processand can also improve the model utility for non-iid data by 7% compared tothe federated averaging method (FedAvg).

关键词： Data privacy federated learning machine learning data difference

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Analysis of CLARANS Algorithm for Weather Data Based on Spark

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Computers, Materials & Continua 2023年第8期76卷 2427-2441页

作者： Jiahao Zhang honglin wang College of Artificial Intelligence Nanjing University of Information Science and TechnologyNanjing210044China

With the rapid development of technology,processing the explosive growth of meteorological data on traditional standalone computing has become increasingly time-consuming,which cannot meet the demands of scientific research and ***,this paper proposes the implementation of the parallel Clustering Large Application based upon RANdomized Search(CLARANS)clustering algorithm on the Spark cloud computing platformto cluster China’s climate regions usingmeteorological data from1988 to *** aim is to address the challenge of applying clustering algorithms to large *** this paper,the morphological similarity distance is adopted as the similarity measurement standard instead of Euclidean distance,which improves clustering ***,the issue of local optima caused by an improper selection of initial clustering centers is addressed by utilizing the max-distance *** to the k-means clustering algorithm already implemented in the Spark platform,the proposed algorithm has strong robustness,can reduce the interference of outliers in the dataset on clustering results,and has higher parallel performance than the frequently used serial algorithms,thus improving the efficiency of big data *** experiment compares the clustered centroid data with the annual average meteorological data of representative cities in the five typical meteorological regions that exist in China,and the results show that the clustering results are in good agreement with the meteorological data obtained from the National Meteorological Science Data *** algorithm has a positive effect on the clustering analysis of massive meteorological data and deserves attention in scientific research activities.

关键词： Clustering analysis cloud computing platform parallel algorithm

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Estimation of the 2001 Kunlun earthquake fault slip from GPS coseismic data using Hori’s inverse method

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Earthquake Science 2009年第6期22卷 609-614页

作者： honglin Jin Hui wang Institute of Earthquake Science China Earthquake Administration Beijing 100036 China

The Hori＇s inverse method based on spectral decomposition was applied to estimate coseismic slip distribution on the rupture plane of the 14 November 2001 Ms8.1 Kunlun earthquake based on GPS survey results. The inversion result shows that the six sliding models can be constrained by the coseismic GPS data. The established slips mainly concentrated along the eastern segment of the fault rupture, and the maximum magnitude is about 7 m. Slip on the eastern segment of the fault rupture represents as purely left-lateral strike-slip. Slip on the western segment of the seismic rupture represents as mainly dip-stip with the maximum dip-slip about 1 m. Total predicted scalar seismic moment is 5.196× 10^2° N.m. Our results constrained by geodetic data are consistent with seismological results.

关键词： Kunlun Ms8.1 earthquake coseismic GPS data fault slip inversion

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Symbiotic mycorrhizal types affect patterns of tree aboveground and belowground C allocation in Northeast China

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Ecological Processes 2023年第1期12卷 379-387页

作者： Qinggui wang Guoyong Yan Xi Luo Guancheng Liu honglin wang Yajuan Xing School of Life Sciences Qufu Normal UniversityQufu 273165China College of Modern Agriculture and Ecological Environment Heilongjiang UniversityHarbin 150080China

Background Given the ubiquitous nature of mycorrhizal symbioses,different symbiotic fungi have obvious differences in structure and function,which may affect associated tree aboveground and belowground C allocation ***,the mechanisms underlying tree aboveground and belowground C allocation and its response to symbiotic mycorrhizal types and other factors(e.g.,resource availability)remain poorly *** We used forest inventory data to explore the potential mechanism of tree aboveground and belowground C allocation patterns in Northeast *** results showed that tree-fungal symbioses were related to the patterns of tree C *** ratio of aboveground to belowground C pool was significantly higher in ectomycorrhizal(EM)-associated trees than that in arbuscular mycorrhizal(AM)-associated *** mycorrhizal types were associ-ated with the responses of tree aboveground and belowground C allocation to different factors,such as mean annual precipitation(MAP)and mean annual temperature(MAT).Almost all factors significantly increased aboveground C allocation in AM-associated trees but significantly decreased it in EM-associated ***,after controlling the other factors,the effects of climate factors(MAT and MAP)on the C allocation of AM-and EM-associated trees were *** in MAT and MAP significantly increased belowground and aboveground C allocation,*** Our results demonstrate symbiotic mycorrhizal types play an important role in controlling tree aboveground and belowground C allocation and dynamics.

关键词： Symbiotic mycorrhizal type Tree carbon allocation pattern Forest carbon cycling Plant-climate interaction Temperate forest

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Microstructure of in-situ Synthesized (TiB+TiC)/Ti Composites Prepared by Hot-pressing

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Journal of Materials Science & Technology 2003年第Z1期19卷 101-102页

作者： Zhenzhu ZHENG Lin GENG honglin wang Weimin ZHOU Hongyu XU School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Hei Long Jiang Education College Harbin 150008 China

In-situ 5 *** TiB whiskers and TiC particulates reinforced Ti composites were fabricated by blending Ti powderand B4C particulates followed by reactive hot-pressing. The microstructure of the composites was investigated byusing differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscope (TEM)and scanning electron microscope (SEM). The results showed that the reactive temperature between Ti and B4C isabove 570°. Two kinds of reinforcements with different shapes were formed during hot-pressing: TiB short-fiber andequiaxed TiC particles. The interracial bonding between the reinforcements and Ti matrix is perfect. No interracialreaction between reinforcements and Ti matrix was found.

关键词： Ti matrix composite, In-situ synthesis, Powder metallurgy

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Dual-photoconductivity in monolayer PtSe_(2) ribbons

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Nano Research 2024年第11期17卷 10189-10195页

作者： Zechen Li honglin wang Huaipeng wang Jing Li Fangzhu Qing Xuesong Li Dan Xie Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China School of Integrated Circuits Beijing National Research Center for Information Science and Technology Tsinghua University Beijing 100084 China State Key Lab of Solid Waste Reuse for Building Materials Beijing Building Materials Academy of Science Research Beijing 100041 China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen 518110 China

Two-dimensional platinum diselenide (PtSe_(2)) has been explored for applications in visible and infrared photodetectors, owing to its tunable electrical and optoelectronic properties governed by layer-dependent bandgaps. Studies have explored both positive photoconductivity (PPC) and negative photoconductivity (NPC) behaviors in few-layer PtSe_(2) thin films, proposing mechanisms related to gas molecule adsorption. However, these proposed mechanisms, typically based on models with ideal limit structures, often lacked consistency with the structure and scale of polycrystalline thin films employed in actual experiments. Here, photodetectors utilizing monolayer PtSe_(2) ribbons were designed, demonstrating a significant NPC effect upon exposure to visible light in atmospheric conditions, with device resistance increasing to over threefold the initial state. Under vacuum conditions, the device demonstrated PPC characteristics. Density functional theory calculations indicated that oxygen molecules physically adsorbed at the edges of PtSe_(2) ribbons were integral. Laser irradiation prompted the detachment of oxygen molecules from the ribbon’s edges, leading to a decreased carrier concentration in channel conductivity. The abundant edge sites of the ribbons endowed the photodetectors with a pronounced NPC response. This study diverted from traditional multilayer PtSe_(2) films to explore monolayer PtSe_(2) ribbons. These ribbons, as limit structures, offered a more fundamental insight into the intrinsic photoconductivity properties of PtSe_(2). Photodetectors employing PtSe_(2) ribbons presented novel application prospects in low-power photodetection, gas detection, and additional fields.

关键词： platinum diselenide photodetector negative photoconductivity positive photoconductivity photoinduced desorption

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Single-atom alloys prepared by two-step thermal evaporation

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Nano Research 2024年第4期17卷 2808-2813页

作者： honglin wang Jing Li Meirong Huang Jizhe Cui Zhiying Cheng Rong Yu Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Lab of Solid Waste Reuse for Building Materials Beijing Building Materials Academy of Science ResearchBeijing 100041China

Single-atom alloys(SAAs)have gained significant attention due to their remarkable atomic utilization efficiency,interactions between single atoms(SAs)and metal supports,and free-atom-like electronic structure of dopant *** this work,we observed the formation of SAs in pre-deposited metal particles by a two-step thermal evaporation technique,thereby establishing the first instance of discovering SAAs by thermal *** discovery of SAAs by thermal evaporation extends the range of SAAs preparation methods to include this traditional synthetic technique,which offers convenience,cost-efficiency,and *** formation mechanism of SAAs prepared using this technique was elucidated by density functional theory *** was demonstrated that thermal evaporation can be utilized to prepare SAAs with multiple SAs,further highlighting its universal applicability.

关键词： single-atom alloys thermal evaporation density functional theory

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Parameter optimization of control system design for uncertain wireless power transfer systems using modified genetic algorithm

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CAAI Transactions on Intelligence Technology 2022年第4期7卷 582-593页

作者： Xudong Gao Wenjie Cao Qiang Yang honglin wang Xiaolei wang Guang Jin Jun Zhang School of Artificial Intelligence/School of Future Technology Nanjing University of Information Science and TechnologyNanjingChina School of Electronic and Information Zhongyuan University of TechnologyZhengzhouChina Graduate School of Engineering Tokyo University of Agriculture and TechnologyKoganeiTokyoJapan

The closed-loop wireless power transfer(WPT)system can realize constant voltage output in the presence of ***,the parameter design of the controller is a difficult *** traditional trial-and-error method is time-consuming and difficult to find optimal parameters.A parameter optimization strategy of control systems for uncertain WPT systems using the modified genetic algorithm(MGA)is ***,because the system has different characteristics at different periods,the simulation process is divided into three *** first one is the start-up stage,in which we mainly consider the overshoot and the rate of the voltage *** second one is the tracking stage,in which the tracking time and switching loss are mainly *** third one is the stabilisation stage,in which the steady-state error and switching loss are mainly ***,three cost functions are designed according to the characteristics of the three stages,and then the optimal controller parameters of each stage are obtained by using ***,the effectiveness of the proposed method is verified by *** optimization results show that compared with the previous parameter optimization method,the optimal controller parameters obtained by the proposed method make the WPT system achieve better performance.

关键词： power optimization system

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Adaptive coherence estimator based on the Krylov subspace technique for airborne radar

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Journal of Systems Engineering and Electronics 2015年第4期26卷 705-712页

作者： Weijian Liu Wenchong Xie Haibo Tong honglin wang Cui Zhou Yongliang wang College of Electronic Science and Engineering National University of Defense Technology Air Force Early Warning Academy

A novel adaptive detector for airborne radar space-time adaptive detection （STAD） in partially homogeneous environments is proposed. The novel detector combines the numerically stable Krylov subspace technique and diagonal loading technique, and it uses the framework of the adaptive coherence estimator （ACE）. It can effectively detect a target with low sample support. Compared with its natural competitors, the novel detector has higher proba- bility of detection （PD）, especially when the number of the training data is low. Moreover, it is shown to be practically constant false alarm rate （CFAR）.

关键词： airborne radar space-time adaptive detection (STAD),constant false alarm rate (CFAR) adaptive coherence estimator(ACE) Krylov subspace numerical stability partially homoge-neous environments.

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Variations in the natural 13C and 15N abundance of plants and soils under long-term N addition and precipitation reduction:interpretation of C and N dynamics

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Forest Ecosystems 2020年第4期7卷 646-658页

作者： Guoyong Yan Shijie Han Mingxin Zhou Wenjing Sun Binbin Huang honglin wang Yajuan Xing Qinggui wang School of Life Sciences Qufu Normal UniversityQufu 273165ShandongChina College of Agricultural Resource and Environment Heilongjiang University74 Xuefu RoadHarbin 150080HeilongjiangChina School of Forestry Northeast Forestry University26 Hexing RoadHarbin 150040HeilongjiangChina. School of Life Sciences Henan UniversityKaifeng 475004HenanChina. Heilongjiang Institute of Construction Technology 999 Xueyuan RoadHarbin 150025HeilongjiangChina

Background:The nitrogen isotope natural abundance(δ^(15)N)provides integrated information on ecosystem N dynamics,and carbon isotope natural abundance(δ^(13)C)has been used to infer how water-using processes of plants change in terrestrial ***,howδ^(13)C andδ^(15)N abundances in plant life and soils respond to N addition and water availability change is still ***,δ^(13)C andδ^(15)N abundances in plant life and soils were used to investigate the effects of long-time(10 years)N addition(+50 kg N·ha^(−1)·yr^(−1)and precipitation reduction(−30%of throughfall)in forest C and N cycling traits in a temperate forest in northern ***:We analyzed theδ^(13)C andδ^(15)N values of dominant plant foliage,litterfall,fungal sporophores,roots,and soils in the *** results showed thatδ^(15)N values of foliage,litterfall,and surface soil layer’s(0–10 cm)total N were significantly increased by N addition,whileδ^(15)N values of fine roots and coarse roots were considerably *** addition also significantly increased theδ^(13)C value of fine roots and total N concentration of the surface soil layer compared with the *** C concentration,δ^(13)C,andδ^(15)N values of foliage andδ^(15)N values of fine roots were significantly increased by precipitation reduction,while N concentration of foliage and litterfall significantly *** combined effects of N addition and precipitation reduction significantly increased theδ^(13)C andδ^(15)N values of foliage as well as theδ^(15)N values of fine roots andδ^(13)C values of ***,foliarδ^(15)N values were significantly correlated with foliageδ^(13)C values,surface soilδ^(15)N values,surface soil C concentration,and N *** concentrations andδ^(13)C values of foliage were significantly correlated withδ^(15)N values and N concentrations of fine ***:This indicates that plants increasingly take up the heavier 15N under N addition and the heavi

关键词： δ^(13)C δ^(15)N N addition Precipitation reduction Nutrient acquisition strategies

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