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홍진후,이행우 ( J . W . Hong,H . W . Lee ) 한국공업화학회 1994 공업화학 Vol.5 No.5
독성이 있는 아크릴 모노머를 비닐에테르로 대체시켜 우레탄아크릴레이트와 배합시키는 것을 특징으로 하는 자외선 경화형 하이브리드 시스템을 조사하였다. 일반적으로 하이브리드 시스템의 코팅 물성은 자유 라디칼계보다는 우수하나 양이온계보다는 열세하게 나타났다. 아크릴계 올리고머 함량이 70% 이상으로 배합된 경우의 하이브리드계는 코팅물성과 경화물성면에서 자유라디칼계와 양이온계보다 뛰어나게 나타났다. 다양한 코팅 시스템의 경화과정을 조사하기 위해서 광열분석기를 적용하였다. 그 결과 코팅 배합물의 경화속도에 미치는 결정적인 인자는 배합물 특성에 따라 달라짐을 알 수 있었다. 동류의 하이브리드계의 경우에는 광경화개시제의 효율보다는 모노머/올리고머 비가 더욱 중요함을 알 수 있었다. UV curable hybrid systems have been investigated in the urethane acrylate based formulations where potentially irritant acrylate monomers have been substituted by vinyl ethers. Generally, among the systems studied, coating properties of hybrid system are superior to those of free radical but inferior to those of cationic systems. When the content of acrylic oligomer is above 70%, however, hybrid system could render an excellent combination of coating and curing properties which outperforms both cationic and free radical systems. Photo-DSC has been used to follow the progress of crosslinking of various coating systems. Results imply that the critical factors in determining the curing rates of coating formulations are different depending upon the formulation characteristics. In the same type of hybrid formulations, the monomer/oligomer ratio rather than photoinitiator efficiency is the critical factor determining the curing rate of the systems.
메탄, 메탄-수소 및 메탄-아르곤 플라즈마로부터 합성된 다이아몬드성 탄소막
최윤,홍진후,이행우,송정식,Choi, Y.,Hong, J. W.,Lee, H. W.,Song, J. S. 한국진공학회 1995 Applied Science and Convergence Technology Vol.4 No.1
Diamondlike carbon(DLC)films having good characteristics in mechanical and optical properties, were synthesized by rf-plasma enhanced chemical vapor deposition method. Methane, methane-hydrogen, or methane-argon were used as source gases. The infrared transparency and composition of the films were investigate. Especially, the anti-reflection effect of KLC film in infrared region was confirmed by depositing it on Ge/Si sample. When DLC films were deposited on the plastic substrates and thermal distortion, which were originated before and during deposition, respectively, played a role as a crack source of the films.
Air-Shroud 인젝터의 분무 특성에 관한 실험적 연구
정해영(H.Y.Jeong),이기형(K.H.Lee),이창식(C.S.Lee),김병수(B.S.Kim),홍진성(J.S.Hong) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
A this experimental study is executed to analyze spray characteristics for air-shrouded injector with different shrouding air pressure. Since spray parameters are very important for the EGI Engine performanc, spray parameters including spray separation angle, targeting capability, penetration, SMD, and atomization characteristics are visualized and analyzed by digital image processing method.<br/> Considerable spray characteristics to design air-shroud injector and adaptor is derived from this experimentation and described in more detail in this thesis.<br/>