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Development of database programs for facial 3D reconstruction.
Kyung-moo Yang(양경무),Yi-suk Kim(김이석),Gil-ro Han(한길로),Han-young Lee(이한영),Nak-eun Chung(정낙은),Young-sik Choi(최영식),Won-tae Lee(이태원),Yong-suk You(유용석),Dae-soon Kwak(곽대순),Chang-hoon Lee(이창훈),Seung-ho Han(한승호 한국법과학회 2005 한국법과학회 학술대회 Vol.2005 No.1
알루미늄 합금의 미끄럼마모 특성에 미치는 상대재 경도의 영향
이한영(Han-Young Lee),조용재(Yong-Jae Cho),김태준(Tae-Jun Kim) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
In order to investigate the wear behavior of the mating Al alloy according to the hardness of the mating tool steel, sliding wear tests have been conducted. As results, it was found that the wear characteristics curve pattern of Al alloy for sliding speeds was not varied with the hardness of the mating discs. However, the changes of wear behavior of Al alloy with the hardness of the mating disc exhibited only in low sliding speed ranges. At these ranges, Al alloy was abrasively worn away. When Al alloy rubbed on a mating disc with the hardness of HRC56, Al₂O₃ particles released from its worn surface were crushed and embedded on the surface of the mating disc and reduced the occurrence of wear. At the high sliding speed ranges, wear of Al alloy was hardly occurred by the formation of thick Al₂O₃ film on the surface of it, regardless of the hardness of the mating discs.
알루미늄 주물의 용탕열을 이용한 Ni-Al계 금속간화합물의 연소합성 코팅에 미치는 Ball-Milling의 영향
이한영 ( Han Young Lee ),조용재 ( Yong Jae Cho ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.2
Ball-milled Ni-Al powder compacts were synthesized by the heat of molten aluminum at 1073 K and were coated on an aluminum casting. The effects of ball-milling on the microstructure of the intermetallic coatings are investigated. The experimental results showed that remelting the aluminum casting around the coating by the heat released during the intermetallic reaction could be prevented by the ball-milling for reactant powders. Further, the coating reaction was preferentially achieved by diffusion. This might be attributed to the fact that the heat released during the intermetallic reaction was dispersed over a prolonged reaction time by the ball-milling. †(Received December 6, 2012)
알루미늄 합금의 미끄럼마모 특성에 미치는 상대재 경도의 영향
이한영(Han-Young Lee),조용재(Yong-Jae Cho),김태준(Tae-Jun Kim),박원규(Won-Kyu Park) 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.2
In order to investigate the wear behavior of aluminum alloy depended on different hardness of the mating tool steel, sliding wear tests were conducted. It was found that the wear characteristics pattern of aluminum alloy for sliding speed was not affected by the hardness of the mating tool steel. However, the effects of the hardness of the mating tool steel exhibited only in relatively low sliding speed ranges. At these ranges, the wear rate of aluminum alloy decreased when increasing the hardness of the mating tool steel. This was attributed by the fact that Al₂O₃ particles released from the aluminum worn surface were crushed and embedded on the mating worn surface with high hardness level. At the high sliding speed ranges, wear of aluminum alloy was hardly occurred by the formation of thick Al₂O₃ film on the worn surface, regardless of the hardness of the mating tool steel.
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.
자동차 클러치 Diaphragm용 PTFE 코팅층의 미끄럼 마찰마모특성
이한영(Han-Young Lee),김태준(Tae-Jun Kim),조용재(Yong-Jae Cho),허만대(Man-Dae Hur) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
Diaphragm as a substitute for the role of clutch facing is contacted with primary wheel cover in newly designed clutch system. PTFE films have been coated on the diaphragm surface to control their friction properties. In this context, sliding wear and friction properties of the PTFE coating layer might have a great influence on performance of the clutch system. In this study, the effect of the size and its uniformity of raw powder for PTFE coating on sliding wear and friction properties were investigated. As a results, PTFE layer coated using the raw powder with small and uniform size has better wear resistance. This is considered that because the coating layer would have denser microstructure with a little amorphous in view of the lower melting point due to large surface area. And their friction coefficient becomes decrease at low sliding speed when the surface of counter material is smooth.
알루미늄 주물 위 용탕열을 이용한 Ni-Al계금속간화합물의 연소합성 코팅
이한영 ( Han Young Lee ),조용재 ( Yong Jae Cho ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.2
Ni-Al based intermetallic compounds of self-propagating high-temperature synthesis (SHS) by the heat of molten aluminum and been coated on the aluminum casting alloy. The effects of the pouring temperature in casting and the thickness of casting substrate on SHS of the coating layer have been investigated. The experimental result showed that the reaction of the coating layer was activated with increasing the pouring temperature in casting and the thickness of casting substrate. However, the aluminum substrate was re-melted by the heat of formation for intermetallic compounds. Then, it was considered that some mechanical or thermal treatments for elemental powder mixtures were required to control the heat of formation for intermetallic compounds in advance.
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.