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    Unsupervised dimensionality reduction method for multivariate time series based on global and local scatter by Zhengxin LI, Gang HU, Fengming ZHANG, Xiaofeng ZHANG, Yongmei ZHAO

    Published 2024-01-01
    “…To solve the problem that the traditional dimensionality reduction methods cannot be directly applied to multivariate time series, and for the existing approaches, it is difficult to ensure the effectiveness of dimensionality reduction while significantly reducing the dimension, an unsupervised dimensionality reduction method of multivariate time series based on global and local scatter was proposed.Firstly, a feature series extraction method was proposed to extract the upper triangular elements of the co-variance matrix of each multivariate time series and combine them into a feature sequence.Then, based on the idea of “minimum local scatter and maximum global scatter,” an unsupervised dimensionality reduction model was presented, which preserved the global information as much as possible while maintaining the local nearest neighbor relationship.Using the feature sequence as the input, the sum of the neighborhood variances of all sample points was minimized, and the variance of all the neighborhood centroids were maximized.The projection matrix obtained by solving the proposed model could be used to perform the dimensionality reduction.Finally, the proposed method was evaluated with experiments on 20 public data sets.The results show that the proposed method can significantly reduce the dimension of multivariate time series, while ensuring the effectiveness of dimensionality reduction.…”
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    Retrieval of Total Scattering Cross Sections of Molecules from Inhomogeneously Broadened Absorption Lines by V. P. Kochanov, L. N. Sinitsa

    Published 2018-01-01
    “…The estimation of the total scattering cross section, ∼630 Å2, in pure water vapor was made.…”
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    Explicit Solutions to Single Scattering of SH Waves with a Radially Gradient Interphase Layer by Jiading Bao, Jun Zhang, Longhai Zeng

    Published 2019-01-01
    “…In this work, analytical solutions to the single scattering of horizontally polarized shear waves (SH) by cylindrical fibers with two specific radially gradient interphase layers are presented. …”
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    Uniqueness in Inverse Electromagnetic Conductive Scattering by Penetrable and Inhomogeneous Obstacles with a Lipschitz Boundary by Fenglong Qu

    Published 2012-01-01
    “…This paper is concerned with the problem of scattering of time-harmonic electromagnetic waves by a penetrable, inhomogeneous, Lipschitz obstacle covered with a thin layer of high conductivity. …”
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    Design of Counter Beam Tunnel Lights for CIE 88 : 2004 Regulation in Threshold Zone by Ming-Jui Chen, Hien-Thanh Le, Lanh-Thanh Le, Wei-Hsiung Tseng, Wei-Yang Lee, Si-Yuan Chen, Sheng-Yen Chen, Hsing-Yuan Liao, Yung-Cheng Li, Hsiao-Yi Lee

    Published 2020-01-01
    “…To enhance driving safety, a counter beam light is proposed to meet CIE (International Commission on Illumination) specifications for tunnel lighting. …”
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    GPS Accuracy for Tree Scouting and Other Horticultural Uses by Reza Ehsani, Sherrie Buchanon, Masoud Salyani

    Published 2009-04-01
    “…AE438, a 7-page illustrated fact sheet by Reza Ehsani, Sherrie Buchanon, and Masoud Salyani, provides citrus producers using GPS for citrus greening disease scouting with some simple explanations of the causes of GPS error and the level of accuracy that can be expected from different classes of GPS receivers. …”
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    GPS Accuracy for Tree Scouting and Other Horticultural Uses by Reza Ehsani, Sherrie Buchanon, Masoud Salyani

    Published 2009-04-01
    “…AE438, a 7-page illustrated fact sheet by Reza Ehsani, Sherrie Buchanon, and Masoud Salyani, provides citrus producers using GPS for citrus greening disease scouting with some simple explanations of the causes of GPS error and the level of accuracy that can be expected from different classes of GPS receivers. …”
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    International Legal Regulation of Military Outer Space Activities by A. I. Antonov

    Published 2012-08-01
    Subjects: “…рrevention of an arms race in outer space…”
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