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유기 발광 다이오드의 광 추출 효율 개선을 위한 다양한 광학기능구조의 적용
김양두,김관,허대홍,이헌 한국세라믹학회 2018 세라미스트 Vol.21 No.1
Recent years, OLEDs have been progressed intensively and been widely applied to Display and Lighting industry,Almost 100% internal quantum efficiency was achieved by developing new materials and structure optimization. However, external quantum efficiency was still low due to total internal reflection of light inside OLED devices and absorption of light at the surface of metal electrode. In order to improve external quantum efficiency of OLED devices, various kinds of optical functional structures were introduced to inside and outside of OLED devices to increase light extraction efficiency. In this paper, various efforts to apply optical functional structures in OLED devices were reviewed and way to improve light extraction efficency of OLED devices were discussed.
Friction Bushing용 복합재료의 미끄럼 마찰마모특성에 관한 연구
이한영(Han-Young Lee),허대홍(Dae-Hong Heo),김태준(Tae-Jun Kim),조용재(Yong-Jae Cho),조범래(Bum-Rae Cho),허만대(Man-Dae Hur) 한국트라이볼로지학회 2006 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.22 No.1
The sliding friction and wear properties of mineral fiber reinforced composite(MF) and glass fiber reinforced composites(GF) are investigated to clarify their field of use and the role of each fiber in friction material. Friction and wear test reveals that GF composite has better wear resistance even though with low friction coefficient, comparing with MF composite. Glass fiber strengthen effectively the matrix and may absorb friction energy to convert it into the fracture energy of them, as well as its lubricative role. However, mineral fiber in MF composite is too small to strengthen the matrix. Then MF composite are easily plowed and worn out by asperity on counter material. Friction coefficient of MF composite is higher friction coefficient than that of GF composite and varied widely with test.
클러치용 Friction Bushing 마찰재의 미끄럼마찰특성에 관한 연구
이한영(Han-Young Lee),조범래(Bum-Rae Cho),허대홍(Dae-Hong Hur),김태준(Tae-Jun Kim),조용재(Yong-Jae Cho),허만대(Man-Dae Hur) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.6
In order to investigate the wear properties of the friction bushing materials for clutch system of automobile. plate-on-disc type wear test have been conducted for three different types of composites reinforced by grass fiber. mineral fiber and mullite at several test conditions. In this paper. the friction properties of three different types of composites have been analyzed. Grass fiber reinforced composite exhibits lower friction coefficient, even though it maintains the friction coefficient stably under all test condition. It aseems to be due to the lubricity of grass fiber. On the contrary, the friction coefficient of mineral fiber reinforced composite exhibits unstable even though it shows high friction coefficient. The friction coefficient of mullite reinforced composite lies between these of grass fiber and mineral fiber reinforced composite. However deviation and amplitude of friction coefficient at a high temperature of 100℃ increases due to the formation of composite film transferred on counter surface.
클러치용 Friction Bushing 마찰재의 미끄럼마모특성에 관한 연구
이한영(Han-Young Lee),조범래(Bum-Rae Cho),허대홍(Dae-Hong Hur),김태준(Tae-Jun Kim),조용재(Yong-Jae Cho),허만대(Man-Dae Hur) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.6
Grass fiber and mineral fiber have been used commonly as a reinforced fiber of friction material in automobile clutch system. Recently porous mullite produced by reaction sintering is also considered as a substitute for those fibers. In order to investigate the wear properties of the friction materials reinforced by them, plate-on-disc type wear test have been conducted at several test conditions. Grass fiber reinforced composite shows good wear properties. Wear loss of mineral fiber reinforced composite increase remarkably at room temperature. However at a high temperature of 100℃, wear properties of mineral fiber reinforced composite is the same as those of grass fiber reinforced composite. Mullite reinforced composite has good wear resistance under mild condition. However, the wear rate under severe condition increases due to the formation of composite film transferred on the counter surface.