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    Wyświetlanie 1-4 z 4
    Tytuł:
    Assessing system impedance based on data regrouping
    Autorzy:
    Xu, Shuangting
    Xiao, Xianyong
    Wang, Yang
    Wu, Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/1848965.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    system impedance
    passive method
    Thevenin equivalent
    power system
    Opis:
    In recent years, assessing supply system impedance has become crucial due to the concerns on power quality and the proliferation of distributed generators. In this paper, a novel method is shown for passive measurement of system impedances using the gapless waveform data collected by a portable power quality monitoring device. This method improves the overall measurement accuracy through data regrouping. Compared with the traditional methods that use the consecutive measurement data directly, the proposed method regroups the data to find better candidates with less flotation on the system side. Simulation studies and extensive field tests have been conducted to verify the effectiveness of the proposed method. The results indicate that the proposed method can serve as a useful tool for impedance measurement tasks performed by utility companies.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 1; 191-208
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing system impedance based on data regrouping
    Autorzy:
    Xu, Shuangting
    Xiao, Xianyong
    Wang, Yang
    Wu, Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/1848954.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    system impedance
    passive method
    Thevenin equivalent
    power system
    Opis:
    In recent years, assessing supply system impedance has become crucial due to the concerns on power quality and the proliferation of distributed generators. In this paper, a novel method is shown for passive measurement of system impedances using the gapless waveform data collected by a portable power quality monitoring device. This method improves the overall measurement accuracy through data regrouping. Compared with the traditional methods that use the consecutive measurement data directly, the proposed method regroups the data to find better candidates with less flotation on the system side. Simulation studies and extensive field tests have been conducted to verify the effectiveness of the proposed method. The results indicate that the proposed method can serve as a useful tool for impedance measurement tasks performed by utility companies.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 1; 191-208
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of methods for correcting outliers in ECG-based biometric identification
    Autorzy:
    Jun, Su
    Szmajda, Miroslaw
    Khoma, Volodymyr
    Khoma, Yuriy
    Sabodashko, Dmytro
    Kochan, Orest
    Wang, Jinfei
    Powiązania:
    https://bibliotekanauki.pl/articles/221531.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Euclidean distance
    autoencoders
    outlier correction
    ECG signal
    human identification
    biometrics
    Opis:
    The aim of this paper is to compare the efficiency of various outlier correction methods for ECG signal processing in biometric applications. The main idea is to correct anomalies in various segments of ECG waveform rather than skipping a corrupted ECG heartbeat in order to achieve better statistics. Experiments were performed using a self-collected Lviv Biometric Dataset. This database contains over 1400 records for 95 unique persons. The baseline identification accuracy without any correction is around 86%. After applying the outlier correction the results were improved up to 98% for autoencoder based algorithms and up to 97.1% for sliding Euclidean window. Adding outlier correction stage in the biometric identification process results in increased processing time (up to 20%), however, it is not critical in the most use-cases.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 3; 387-398
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and evaluation of a needle tip measurement system based on binocular vision
    Autorzy:
    Lin, Yuyang
    Shi, Yunlai
    Zhang, Jun
    Wang, Fugang
    Sun, Haichao
    Powiązania:
    https://bibliotekanauki.pl/articles/220501.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    needle tip measurement
    binocular vision system
    measurement capability analysis
    non-contact optical positioning
    Opis:
    The precise location of the needle tip is critical in robot-assisted needle-based percutaneous interventions. An automatic needle tip measuring system based on binocular vision technology with the advantages of non-contact, excellent accuracy and high stability is designed and evaluated. First the measurement requirements of the prostate intervention robot are introduced. A laser interferometer is used as the reference for measuring the position of the needle tip whose relative position variation is described as the needle tip distance in the time domain. The parameters of the binocular cameras are obtained by Zhang’s calibration method. Then a robust needle tip extraction algorithm is specially designed to detect the pixel coordinates of the needle tip without installing the marked points. Once the binocular cameras have completed the stereo matching, the 3D coordinates of the needle tip are estimated. The measurement capability analysis (MCA) is used to evaluate the performance of the proposed system. The accuracy of the system can be controlled within 0.3621 mm. The agreement analysis is conducted by the Bland-Altman analysis, and the Pearson correlation coefficient is 0.999847. The P/T ratio value is 16.42% in the repeatability analysis. The results indicate that the accuracy and stability of the binocular vision needle tip measuring system are adequate to meet the requirement for the needle tip measurement in percutaneous interventions.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 3; 495-512
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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