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    Oral cleaning tool
    4.
    外观设计
    Oral cleaning tool 有权

    公开(公告)号：USD1010809S1

    公开(公告)日：2024-01-09

    申请号：US29763532

    申请日：2020-12-23

    Applicant: Zhiwei Wang

    Designer： Zhiwei Wang

    Abstract: FIG. 1 is a front elevational view of an oral cleaning tool showing my new design;
    FIG. 2 is a rear elevational view thereof;
    FIG. 3 is a left side view thereof;
    FIG. 4 is a right side view thereof;
    FIG. 5 is an enlarged top plan view thereof;
    FIG. 6 is an enlarged bottom plan view thereof;
    FIG. 7 is a perspective view thereof; and,
    FIG. 8 is another perspective view thereof.

    Cup turner
    5.
    外观设计
    Cup turner 有权

    公开(公告)号：USD963008S1

    公开(公告)日：2022-09-06

    申请号：US29702147

    申请日：2019-08-16

    Applicant: Zhiwei Wang

    Designer： Zhiwei Wang

    Data mining based approach for online calibration of phasor measurement unit (PMU)
    7.
    发明授权
    Data mining based approach for online calibration of phasor measurement unit (PMU) 有权

    公开(公告)号：US10551471B2

    公开(公告)日：2020-02-04

    申请号：US15787365

    申请日：2017-10-18

    Applicant: Xiao Lu ,  Xinan Wang ,  Di Shi ,  Zhiwei Wang ,  Jianyu Luo ,  Chunlei Xu

    Inventor： Xiao Lu ,  Xinan Wang ,  Di Shi ,  Zhiwei Wang ,  Jianyu Luo ,  Chunlei Xu

    IPC: G01R19/25 ,  G01R35/00

    Abstract: Data quality of Phasor Measurement Unit (PMU) is receiving increasing attention as it has been identified as one of the limiting factors that affect many wide-area measurement system (WAMS) based applications. In general, existing PMU calibration methods include offline testing and model based approaches. However, in practice, the effectiveness of both is limited due to the very strong assumptions employed. This invention presents a novel framework for online error detection and calibration of PMU measurement using density-based spatial clustering of applications with noise (DBSCAN) based on much relaxed assumptions. With a new problem formulation, the proposed data mining based methodology is applicable across a wide spectrum of practical conditions and one side-product of it is more accurate transmission line parameters for the energy management system (EMS) database and protective relay settings. Case studies are presented to demonstrate the effectiveness of the proposed method.

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