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A New Time-Aware Collaborative Filtering Intelligent Recommendation System

Computers, Materials & Continua 2019年第8期61卷 849-859页

作者： Weijin Jiang Jiahui Chen Yirong Jiang Yuhui Xu Yang Wang Lina Tan Guo Liang Key Laboratory of Hunan Province for New Retail Virtual Reality Technology Hunan University of Technology and BusinessChangsha410205China Institute of Big Data and Internet Innovation Hunan University of Technology and BusinessChangsha410205China School of Computer Science and Technology Wuhan University of TechnologyWuhan430073China Tonghua Normal University Tonghua134002China School of Bioinformatics University of MinnesotaTwin CitiesUSA

Aiming at the problem that the traditional collaborative filtering recommendation algorithm does not fully consider the influence of correlation between projects on recommendation accuracy,this paper introduces project attribute fuzzy matrix,measures the project relevance through fuzzy clustering method,and classifies all project ***,the weight of the project relevance is introduced in the user similarity calculation,so that the nearest neighbor search is more *** the prediction scoring section,considering the change of user interest with time,it is proposed to use the time weighting function to improve the influence of the time effect of the evaluation,so that the newer evaluation information in the system has a relatively large *** experimental results show that the improved algorithm improves the recommendation accuracy and improves the recommendation quality.

关键词： Fuzzy clustering time weight attenuation function Collaborative filtering method recommendation algorithm

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Effect of the Real Irregular Terrain on the Lightning-radiated Electromagnetic Field Propagation

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Meteorological and Environmental Research 2021年第3期12卷 55-61页

作者： Fangrong ZHOU Yi MA Hao PAN Bin ZOU Jing YANG Electric Power Research Institute Yunnan Power Grid Company Ltd.Kunming 650217China Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster(CICFEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science and TechnologyNanjing 210044China

The propagation of the lightning-radiated electromagnetic field along the real irregular terrain around Yangzhou Direction Finder(DF)site(119°42′E,32°39′N)and Nanjing DF site(118°46′E,32°03′N)of Jiangsu Province in China is *** results show that the rough irregular terrain results in the rapid magnitude attenuation and the increase of the rise-time of the field *** example,for the Yangzhou DF site as the circumference of a radius of 45 km,the root-mean-squared height(RMSH)of the real irregular terrain varies from 7 to 33 m;the extra field attenuation relative to the ideal ground surface ranges from 1%to 11%,and the extra rise-time increment varies from 0.1 to 0.6μ***,the extracted current peak of lightning return stroke may be underestimated from the remotely measured electromagnetic field,and the error varies along with different azimuths.

关键词： Global Digital Elevation Model(GDEM) Irregular terrain Lightning electromagnetic fields Effective impedance attenuation function

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Model of counterparty risk with geometric attenuation and valuation of CDS

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Journal of Southeast University(English Edition) 2008年第S1期24卷 196-198页

作者： Bai Yunfen1,2 Hu Xinhua3,4 Ye Zhongxing1(1 Department of Mathematics, Shanghai Jiaotong University, Shanghai 200240, China)(2 Department of Mathematics, Shijiazhuang College, Shijiazhuang 050035, China)(3 Guanghua Institute of Management, Peking University, Beijing 100032, China)(4 Postdoctoral Workstation of ICBC, Beijing 100036, China)

To investigate the impact of microstructure interdependency of a counterparty explicitly, a geometric function is introduced in one firm's default intensity to reflect the attenuation behavior of the impact of its counterparty firm's default. The general joint distribution and marginal distributions of default times are derived by employing the change of measure. The fair premium of a vanilla CDS (credit default swap) is obtained in continuous and discrete contexts, respectively. The swap premium in a discrete context is similar to the accumulated interest during the period between two payment days, and the short rate is the swap rate in a continuous context.

关键词： counterparty risk dependent default attenuation function change of measure credit default swap

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