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Determination of Noise Threshold from Signal Histogram in the Wavelet Domain
Eunseo Kim,Kamin Lee,Sejung Yang,Byung-Uk Lee 대한전자공학회 2014 전자공학회논문지 Vol.51 No.2
Thresholding in frequency domain is a simple and effective noise reduction technique. Determination of the threshold is critical to the image quality. The optimal threshold minimizing the Mean Square Error (MSE) is chosen adaptively in the wavelet domain; we utilize an equation of the MSE for the soft-thresholded signal and the histogram of wavelet coefficients of the original image and noisy image. The histogram of the original signal is estimated through the deconvolution assuming that the probability density functions (pdfs) of the original signal and the noise are statistically independent. The proposed method is quite general in that it does not assume any prior for the source pdf.
Validation of a New Food Frequency Questionnaire for Protein Intake Assessment in Korean
Eunseo Heu,Yunjung Lee,Donghyun Kim,Yong-Chan Ha,Yongsoon Park 대한골대사학회 2022 대한골대사학회지 Vol.29 No.1
Background: Protein intake is a modifiable factor associated with sarcopenia preven- tion; however, no appropriate methods exist to assess dietary protein intake in Koreans. This study developed and validated a simple and convenient food frequency question- naire (FFQ) to determine protein intake in Koreans. Methods: A total of 120 participants aged >19 years were asked to complete both the FFQ used by the Korean National Health and Nutrition Examination Survey (KNHANES) and the newly developed Korean Protein Assessment Tool (KPAT). Protein intakes measured using the FFQ and the KPAT were compared using Pearson correlation coefficients, Bland-Altman plots, and intra- class correlation coefficients. Results: Protein intakes from the FFQ (62.06±25.56 g/day) and KPAT (61.12±24.26 g/day) did not differ significantly (P = 0.144). Pearson’s correla- tion coefficient values ranging from 0.92 to 0.96 indicated a positive correlation, while the intraclass correlation coefficient of 0.979 indicated excellent reliability in protein in- take of the FFQ and the KPAT. The Bland-Altman plot also showed high agreement in the mean differences in protein intakes estimated by the FFQ and the KPAT. Conclusions: KPAT, a newly developed and simplified method, showed an acceptable correlation com- pared to previous FFQ tools. Thus, the KPAT may be useful to assess dietary protein in- take in the Korean population.