http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Visualization of Hysteretic Shock Waves in a Supersonic Nozzle
이종성(Jong Sung Lee),차용수(Yong Su Cha),신춘식(Choon Sik Shin),김희동(Heuy Dong Kim) 한국가시화정보학회 2009 한국가시화정보학회 학술발표대회 논문집 Vol.2009 No.11
The jet structure has been known as a fundamental phenomenon of the supersonic fluid mechanics. It is known in the recent studies that the hysteresis phenomenon for the reflection type of shock wave in the supersonic jet is occurred under the quasi-steady flow. However, the phenomenon in the internal flow field have not been investigated satisfactorily. The purpose of this study is to clarify the hysteresis phenomena of shock wave in a supersonic nozzle experimentally and to discuss the relationship between hysteresis phenomenon and rate of the change of pressure ratio with time.
손형우 ( Hyeong U Son ),남동윤 ( Dong Yoon Nam ),김민아 ( Min Ah Kim ),차용수 ( Yong Su Cha ),김종명 ( Jong Myung Kim ),신용규 ( Yong Kyu Shin ),이상한 ( Sang Han Lee ) 한국식품저장유통학회(구 한국농산물저장유통학회) 2011 한국식품저장유통학회지 Vol.18 No.6
Angelica keiskei is a perennial herb belonging to the Umbelliferae family. In this study, the whitening effect of A. keiskei extracts was examined through melanogenesis and tyrosinase inhibitory assays. The ethanol extract (50%) significantly inhibited tyrosinase in a concentration-dependent manner. RT-PCR revealed that the extract exhibited decreased expression of tyrosinase, tyrosinase-related protein-1, tyrosinase-related protein-2, and melanocyte-inducing transcription factor. These results suggest that the extract can be used as an ingredient for the development of cosmeceuticals.
김민아 ( Min A Kim ),손형우 ( Hyeong U Son ),남동윤 ( Dong Yoon Nam ),차용수 ( Yong Su Cha ),신용규 ( Yong Kyu Shin ),최용희 ( Yong Hee Choi ),이상한 ( Sang Han Lee ) 한국식품저장유통학회(구 한국농산물저장유통학회) 2012 한국식품저장유통학회지 Vol.19 No.5
The purpose of this study was to evaluate the anti-atopic-dermatitis effect of Angelica keiskei extract using a DNFB-induced animal model of atopic-dermatitis symptoms. A. keiskei was prepared via extraction with DW, 50% ethanol, and 100% ethanol in addition to fresh juice. All the extracts reduced the thickness levels of the ears and ear epidermis against swelling by DNFB inducement, especially in the aqueous-extract-treated group. The mRNA expressions of matrix metalloproteinases (MMPs), however, were not observed, which may indicate that Angelica keiskei extract alleviates the atopic-dermatitis symptoms in an MMP-independent manner. Finally, the level of the inflammatory cytokine IL-4 was inhibited only in the juice-treated group, although the IL-13 level was inhibited in the juice-, 50%-ethanol-extract-, and 100%-ethanol-extract-treated groups in a dose-dependent manner, and was not inhibited in the aqueous-extract-treated group. Taken together, these results suggest that Angelica keiskei extract has an inhibitory effect on atopic dermatitis, and may be a useful biomaterial for the development of cosmeceuticals.