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International journal of precision engineering and manufacturing v.11 no.2, 2010년, pp.237 - 246   SCOPUS
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Fault Detection of Cycle-Based Signals Using Wavelet Transform in FAB Processes

Kim, Jun-Seok    (Division of Information Management Engineering, Korea University   ); Lee, Jae-Hyun    (E-LAND   ); Kim, Ji-Hyun    (College of Business Administration, Kwangwoon University   ); Baek, Jun-Geol    (Division of Information Management Engineering, Korea University   ); Kim, Sung-Shick    (Division of Information Management Engineering, Korea University  );
  • 초록

    This paper presents a wavelet multiresolution analysis based process fault detection algorithm to improve the accuracy of fault detection. Using Haar wavelet, coefficients that well reflect the process condition are selected and Hotelling's T2 control chart that uses the selected coefficients is constructed for assessing the process condition. To enhance the overall efficiency and accuracy of fault detection, the following two steps are suggested: First, a denoising method that is based on wavelet transform and soft-thresholding. Second, coefficient selection methods that use the difference in the variance. For performance evaluation, various types of abnormal process conditions are simulated and the proposed algorithm is compared with other methodologies. Also, We apply the proposed algorithm to the industrial data of the dry etching process, which is one of the FAB processes. Our method has a better fault-detection performance for various sections and various changes in mean than other methods.


  • 주제어

    Cycle-based Signal .   Fault Detection .   Wavelet Transform .   Control Chart.  

  • 참고문헌 (18)

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