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하현희,고혜진,신성철,김윤희 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.8
Naphthalene end-capped triethylsilylethynyl anthradithiophene was synthesized by a Suzuki coupling reaction. The obtained compound had good solubility due to its bulky triethylsilylethynyl groups although the extended π-conjugated backbone structure. The thermal stability of the new material was analyzed by thermogravimetry analysis and differential scanning calorimeter thermograms. The optical and electrochemical properties were examined. A thin film of compound was fabricated by spin-coating and exhibited p-channel organic thin film transistors (OTFTs) transport with hole mobility of 4 × 10−4 cm2/Vs.
Inhibitory Effect of Taraxacum mongolicums (蒲公英) on NO Production in LPS-stimulated Macrophages
하현희,박순영,고우신,장정수,김영희,Ha, Hyeon-Hee,Park, Sun-Young,Ko, Woo-Shin,Jang, Jeong-Su,Kim, Young-Hee The Society of Korean Medicine Ophthalmology 2007 한방안이비인후피부과학회지 Vol.20 No.3
포공영(蒲公英)은 예로부터 청열해독약(淸熱解毒藥)으로 사용되어 왔으며 NO가 염증의 한 요인이기 때문에 포공영의 항염증 작용기작을 밝히기 위하여 LPS로 자극된 대식세포주 RAW264.7 세포에서 포공영 열수 추출물 (AETM)의 NO 생성에 미치는 효과를 조사하였다. 포공영은 NO 생성 및 iNOS 단백질 발현, iNOS mRNA 발현을 저해하였으며, 전사인자인 $NF-kB$의 핵으로의 이동을 억제하였다. 또한 LPS에 의해서 활성화되는 ERK/MAPK 효소의 활성을 현저히 억제하였다. 이 결과들로 보아 포공영의 항염증 작용이 ERK/MAPK 활성 저해 및 $NF-kB$ 활성 저해로 인한 iNOS 발현의 억제 때문인 것으로 사료된다.
송승화 ( Seung Hwa Song ),박성훈 ( Sung Hun Park ),박종욱 ( Jong Wook Park ),황지혜 ( Ji Hye Hwang ),여고은 ( Go Eun Yeo ),하현희 ( Hyun Hee Ha ),김정현 ( Jung Hyeun Kim ) 서울시립대학교 산업기술연구소 2006 산업기술연구소논문집 Vol.14 No.-
The prediction of the terminal velocity of particles in quiescent fluid is important in many industrial applications such as mining processes, fluidized bed reactor, and grain milling. Many studies on this topic have been reported with relatively accurate correlations for solid spheres, but it is hard to find experimental results and correlations for terminal velocity of irregular shaped bodies. In this study, the settling velocity of various types of objects was examined at Reynolds number lower than 20 in high viscous fluid; glycerin and silicon oil. Our experiment was mainly focused on obtaining the relationship between drag coefficient and Reynolds number for irregular shaped bodies. As a result, the drag coefficient of the irregular shaped bodies has discrepancy of about 15% from the Haider and Levenspiel correlation ( Powder Technol. 58, 1989, pp. 63).