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박성태(Sung-Tae Park),김재웅(Jae-Woong Gim),양진국(Jin-kuk Yang) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.10
This paper presents that the Wavelet Transform can be used to detect the various local defects in a gearbox. Two types of defects which are broken tooth and localized wear, are experimented and the signals are collected by accerometer and analyized. Because of the complecity of the signals acquired from sensor, it is needed to identify the interesting signal. The natural frequencies of shafts and the gear mesh frequency(GMF) is calculated theretically. DWT, CWT and the application are used to extract a gearlocalized defect feature from the vibration signal of the gearbox with the defective gear. The results shows the transform is more effective to detect the failures than the Fourier Transform.<br/>
Eun Hye Ryu,Sung Woong Gim,Su Jung Lee,Ji Wung Kwon 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
In this study was we compared and analyzed the antioxidant and antimicrobial activities of unripened and ripened fruit black raspberry (Rubus occidentalis) extracts. Total polyphenol and total flavonoid content were higher in unripened black raspberry extracts than in ripened fruit, and total anthocyanin content was higher in ripened fruits. The DPPH and ABTS radical scavenging activity was also found to be superior to that of unripened fruit. NO scavenging activity was found only in unripened fruit extract, and in the antimicrobial activity, it was confirmed that the unripened fruit extract had a relatively high antimicrobial effect compared to the ripened fruit extract, except for K. pneumoniae KCTC 2245. These results suggest that the unripened fruit black raspberry (Rubus occidentalis) extracts has better antioxidant and antimicrobial activity than that of the ripened fruit, so it has a higher potential for development as an antimicrobial material such as a natural antioxidant and preservative.
미숙과와 완숙과 복분자 추출물의 항산화 및 항균 활성 비교
류은혜 ( Eun-hye Ryu ),김성웅 ( Sung-woong Gim ),이수정 ( Su-jung Lee ),김용석 ( Yong-suk Kim ),권지웅 ( Ji-wung Kwon ) 한국식품조리과학회 2021 한국식품조리과학회지 Vol.37 No.5
Purpose: This study compared and analyzed the antioxidant and antimicrobial activities of unripened and ripened black raspberry (Rubus occidentalis) extracts. Methods: Unripened and ripened extracts were prepared with water, 25%, 50%, and 75% ethanol. To estimate in vitro antioxidant activity, total polyphenol, total flavonoid, and total anthocyanin contents were measured and DPPH and ABTS radical and nitric oxide (NO) scavenging activity were analyzed. In addition, antimicrobial activity against pathogenic microorganisms and bronchus disease-inducing bacteria was measured. Results: Total polyphenol and total flavonoid content were higher in unripened than in ripened black raspberry extracts, and total anthocyanin content was higher in ripened extracts. The DPPH and ABTS radical scavenging activity of ripened extracts was also found to be superior to that of the unripened extracts. The NO scavenging activity was found only in unripened extracts. Further, it was confirmed that the unripened extract had a relatively high antimicrobial activity except against K. pneumoniae KCTC 2245 compared to the ripened extract. Conclusion: These results suggest that unripened black raspberry (Rubus occidentalis) extracts have better antioxidant and antimicrobial activity than ripened extract. Thus, unripened black raspberry extracts have a higher potential for development as antimicrobial material such as a natural antioxidant and preservatives.