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윤천,최재홍 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.8
Liquid crystal display (LCD) devices contain a colour filter which can visualise colour images by transmitting or absorbing light. Colour properties of LCD mainly depend on colour materials such as pigments and polymeric binders. In this paper, colour properties were studied to improve colour quality of LCD. Generally, the colour properties can be classified into three categories which are colour purity, brightness and contrast ratio. For this study, photo resists were prepared by treatment of pigments and synthesis of polymeric binder. The treated pigments were dispersed and formulated with additives for preparing a photo resist that could be used for manufacturing colour filters. As a result of what we studied, type, mixture ratio and concentration of pigments were very important to improve colour purity of LCD device.
DC Magnetron Sputtering에 의한 ATO 박막의 제조(II)전기적 특성
윤천,이혜용,정윤중,이경희,Yoon, C.,Lee, H.Y.,Chung, Y.J.,Lee, K.H. 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.5
Sb doped SnO2(ATO: Antinomy doped Tin Oxide) thin films were prepared by a DC magnetron spttuering method using an oxide target and the electrical characteristics of ATO films were investigated. The experimen-tal conditions are as follows :Ar flow rate ; 0~100 sccm deposition tempera-ture ; 250~40$0^{\circ}C$ DC sputter powder ; 150~550W and sputteing pressure ; 2~7 mTorr, The thickness of depositied ATO films were 600$\AA$~1100 $\AA$ ranges. The resistivity of ATO films was decreased due to the increase of the crystallinity of ATO films with deposition temperature. The decrease of carrier concentration of films with the increase of oxygen flow rate and working pressure is responsible for the increase of resistivity. Increasing of sputtering power raised the resistivity of films by decreasing the carrier mobility.
DC Magnetron Sputtering에 의한 ATO 박막의 제조 (I)증착특성
윤천,이혜용,정윤중,Yoon, C.,Lee, H.Y.,Chung, Y.J. 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.4
Sb doped SnO2(ATO:Antinomy doped Tin Oxide) thin films were prepared by a DC magnetron spttuering method using oxide target and the deposition characteristics were investigated. The experimental conditions are as follows :Ar flow rate : 100 sccm oxygen flow rates ; 0-100 sccm deposition temperature ; 250 -40$0^{\circ}C$ DC sputter powder ; 150~550 W and sputtering pressure ; ; 2~7 mTorr. Deposition rate greatly depends not on the deposition temperature but on the reaction pressure oxygen flow rate and sputter power,. when the sputter powder is low ATO thin films with (110) preferred orientation are deposited. And when the sputter power is high (110) prefered orientation appeares with decreasing of oxygen flow rate and increasing of suputte-ring pressure.
대형 디젤엔진용 연료분사시스템에 따른 분사특성과 엔진성능에 관한 연구
윤천한 한국특허학회 2014 특허학연구 : 한국특허학회지 Vol.15 No.1
본 연구는 우리나라 수송용 차량의 대부분을 차지하는 대형 디젤 자동차에서 배출되는 배출가 스 및 연료 소모량은 실로 막대하다. 이에 대형 디 젤기관에서 연료분사장치가 기관성능과 배출가스 에 미치는 영향을 연구하였다. 연료분사장치의 분 공 지름, 인젝션파이프 지름, 분사시기를 변수로 실험하였다. 그 결과 분공 지름을 작게 할수록 토 크, 연비와 smoke는 감소하고 NOx는 증가하였다. 노즐의 분공 지름이 작은 경우 분사율은 낮으나, 분사압력은 상당히 높아지고 분사기간도 증가함을 알 수 있다.노즐의 분공 지름만 감소시켜 분사압을 높인 경우 연비와 smoke의 배출량은 줄일 수 있 으나, NOx는 악화되었다. 분사관의 지름을 증가시 켰을 경우 토크, 연비, smoke는 우세하였으며, NOx의 배출량은 많아졌다. 분사시기를 진각시키면 토크, 연비, smoke는 개선시킬 수 있으나, NOx의 배출량이 증가되었다. This study has focused on using fuel injections as variables for measuring performance and reducing exhaust gas in heavy duty diesel engine. In experiments, we changed nozzle hole diameter, diameter of an injection pipe, and injection timing as variable. 1. The results show that torque, fuel consumption and smoke are reduced as nozzle hole diameter decreases, while NOx increases. When the diameter of injection pipe is reduced, torque, fuel consumption and smoke are deteriorated, but NOx is decreased. In addition, when the time for injection is advanced, torque, fuel consumption and smoke are improved, but the density of NOx is increased .
직접 디젤 연료분사계의 분사 특성과 기관 성능 개선에 관한 연구
윤천한 ( Cheon Han Yoon ),김경훈 ( Kyung Hoon Kim ) 한국분무공학회 2002 한국액체미립화학회지 Vol.7 No.1
N/A This study has focused on using fuel injections as variables for measuring performance and reducing exhaust gas in turbo-charger diesel engine. In experiments, we changed nozzle hole diameter, diameter of an injection pipe, and injection timing as variable. The results show that torque, fuel consumption and smoke are reduced as nozzle hole diameter decreases, while NOx increases. When the diameter of injector is reduced, torque, fuel consumption and smoke are deteriorated, but NOx is decreased. In addition, when the time for injection is advanced, torque, fuel consumption and smoke are improved, but the density of NOx is increased.
터보차져 인터쿨러 디젤기관에서 연료 분사특성과 기관성능의 개선
윤천한(Choenhan Yoon),김경훈(Kyunghoon Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
This study has focused on using fuel injections as variables for measuring performance and reducing exhaust gas in turbo-charger inter-cooler diesel engine. In experiments, we changed nozzle hole diameter, diameter of an injection pipe, and injection timing as variable.<br/> The results show that torque, fuel consumption and smoke are reduced as nozzle hole diameter decreases, while NOx increases. When the diameter of injector is reduced, torque, fuel consumption and smoke are deteriorated, but NOx is decreased. In addition, when the time for injection is advanced, torque, fuel consumption and smoke are improved, but the density of NOx is increased.