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LED형 매립형 항공등 시스템의 개발 시험에 대한 고찰
이상철(Sang-Cheol Lee),신재흥(Jae-Heung Shin),이승연(Seung-Youn Lee),임근영(Keun-Young Lim),임민수(Min-Su Lim) 대한전기학회 2012 전기학회논문지 P Vol.61 No.3
Aeronautical lights, which are internationally standardized sequence of colors and placements, are aeronautic safety devices that provide visual information to pilots by continuously adjusting their light intensity to appropriate level. In this paper, we consider the development testing for in pavement LED aeronautical light system such as taxiway centerline, stop line and temporary stop line. The test results of LED sourced lights have shown a drastic improvement in power consumption levels and cost efficiency compared to their halogen sourced counterparts The LED light used only 42.7% as much power as their halogen sourced counterparts. Taking installation costs into account, LED will cost only 58% of its halogen counterparts. These results suggest that developing the LED sourced aeronautical light would result in globally competitive products thar guarantees satisfaction to their consumers, and that both cost effective and energy efficient.
W/O 에멀젼의 주요 구성 성분들이 모사 헤미셀룰로오스 가수분해액에 있는 초산의 제거에 미치는 영향
임성진 ( Sung Jin Lim ),이상철 ( Sang Cheol Lee ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.6
초산은 묽은 산에 의해 처리되어 얻어진 헤미셀룰로오스 가수분해액 중 가장 양이 많을 뿐만 아니라 중대한 에탄올발효 저해물질이다. 그 가수분해액으로부터 초산을 선택적으로 제거하는데 최적인 분리시스템을 찾기 위하여 모사 헤미셀룰로오스 가수분해액으로 자일로스, 초산과 황산의 혼합물이 선택되었다. 이러한 목적을 이루기 위해 에멀젼형 액막법이 모사 헤미셀룰로오스 가수분해액으로부터 초산을 제거하는데 적용되었다. W/O 에멀젼의 주요 구성 성분들, 즉아민계 추출제 종류, 계면활성제 조성, 첨가제 종류와 회수제의 종류 및 농도가 모사 헤미셀룰로오스 가수분해액에 있는 초산, 자일로스와 황산의 추출에 미치는 영향이 조사되었다. 특별한 실험 조건에서, 초산의 추출율은 95% 이상이었고, 자일로스의 손실은 미미하였는데, 이것은 현 에멀젼형 액막법이 경제성이 높은 공정이 될 수 있다는 것을 의미한다. Acetic acid is the most abundant and serious ethanol fermentation inhibitor in dilute-acid hemicellulosic hydrolysates. A mixture of xylose, acetic acid and sulfuric acid was chosen as a simulated hemicellulosic hydrolysate so as to find an optimal separation system to selectively remove acetic acid from the hydrolysates. In order to attain the purpose, emulsion liquid membrane was applied to removal of acetic acid from the simulated hemicellulosic hydrolysate. The effects of main constituents of water-in-oil (W/O) emulsion, such as amine extractant type, surfactant composition, additive type, and type and concentration of stripping agent, on extraction of acetic acid, xylose, and sulfuric acid in the simulated hemicellulosic hydrolysate were investigated. Under specific experimental conditions, degree of extraction of acetic acid was higher than 95% while loss of xylose was insignificant, which means that the current emulsion liquid membrane can be an economically feasible process.
가정용 가스버너에서 1차 공기비와 부하거리가 버너 열효율 및 CO 배출에 미치는 영향에 관한 실험적 연구
임재범(Jea Beom Lim),박장희(Jang Hee Park),이상철(Sang Cheol Lee),정용기(Yong Ki Jeong),김양경(Yang Gyeong Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Primary air ratio, load height and grate shape are the main factors which affect the heat efficiency of domestic gas burner. This study focused on the effect of primary air ratio and load height that affect the flame formation and extinction. Flame shape, thermal efficiency and CO emissions were observed while primary air ratio was controlled by forced air supply from 0.2 to 0.8, and load height was changed from 11㎜ to 35㎜. It was found that the efficiency increased as flame length was shorter at primary air ratio 0.2~0.7, but the efficiency decreased as flame blow-off occurred above primary air ratio 0.7. And, CO emission and heat efficiency had inverse relation at entire region. However, in case of the load height, the efficiency and CO emission had similar behavior because the heating area increased.