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디스크 브레이크의 트라이볼로지적 특성에 관한 실험적 연구
김청균(Chungkyun Kim),조승현(Seunghyun Cho),한주현(Joohyun Han),강현준(Hyunjoon Kang),김도현(Dohyun Kim),김한구(Hangoo Kim),이일권(Ilkwon Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper surface profile, roughness and hardness were experimented for study of tribological characteristic of automotive disk brake. In this work, 5 specimens were employed for roughness test as a function running distance. Despite the fact that brakes must operate under a variety of environmental conditions, most research has worked in laboratory with ideal condition. This paper investigated the average roughness of disk brakes which are actually operated in automotive. Average roughness decreased with running distance from 0 to about 10,000㎞ due to unevenly contact surfaces between disk brake and pads. But that has been increased with running distance from about 10,000 to 20,000㎞ due to loss of solid lubrication film and higher contact pressure between two rubbing surfaces.
주행거리에 따른 디스크 브레이크의 마찰 마멸 특성 연구
김청균(Chungkyun Kim),조승현(Seunghyun Cho),한주현(Joohyun Han),강현준(Hyunjoon Kang),김도현(Dohyun Kim),김한구(Hangoo Kim),이일권(Ilkwon Lee) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
In this paper surface profile, roughness and hardness were experimented for study of friction wear characteristic of automotive disk brake considering running distance. In this work, 5 specimens were employed for roughness test as a function running distance. Despite the fact that brakes must operate under a variety of environmental conditions, most research has worked in laboratory with ideal condition. This paper investigated the average roughness of disk brakes which are actually operated in automotive. Average roughness decreased with running distance from 0 to about 10,000㎞ due to unevenly contact surfaces between disk brake and pads. But that has been increased with running distance from about 10,000 to 20,000㎞ due to loss of solid lubrication film and higher contact pressure between two rubbing surfaces.
김태환(Taehwan Kim),김한구(Hangoo Kim),김도현(Dohyun Kim),김청균(Chungkyun Kim) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.11
This paper presents the numerical results of the contact force and durability with optimized design of lip seal. Using the finite element method based on the Ogden model, the contact force and durability of lip seals were analyzed to illuminate the effect of various shaft interferences and the shape of lip seals. And the optimized design is performed through the Taguchi method. The results show that No.5 model is the best model. And the interference, angle and displacement(d) is important factors.
립 실의 최적화 설계에 따른 접촉력 및 내구성 비교 해석
김태환(Taehwan Kim),김한구(Hangoo Kim),김도현(Dohyun Kim),김청균(Chungkyun Kim) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
This paper presents the numerical results of the the contact force and dulability with optimized design of lip seal. Using the finite element method based on the Mooney-Rivlin model, the contact force and dulability of lip seals were analyzed to illuminate the effect of various shaft interferences and the shape of lip seals. And the optimized design is performed through the Taguchi method. The results show that No.4 model is best model. And the inteference, angle and round is important factors.
디젤 엔진에서 밸브 스템계의 표면 조도에 따른 오일 누설 특성에 관한 실험적 연구
이일권(Ilkwon Lee),김시영(Siyoung Kim),국창호(Changho Kook),김청균(Chungkyun Kim),김도현(Dohyun Kim),김승철(Seungchul Kim),김한구(Hangoo Kim),문학훈(Hakhoon Moon) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper is for study on the leakage including with surface roughness in the valve stem system of diesel engine. This paper is for study on the oil leakage including with surface roughness in the valve stem system of diesel engine. In the leakage 1, the surface roughness was very dense, but leakage quantity of oil showed growing a trend. In the leakage 1 and 2, when the surface roughness was more scabrous, the control of oil leakage verified that fact is more advantageous. In the leakage 3, the sample verified more favorable for control of oil leakage that the surface roughness of valve stem was not soft. The experimental result of leakage 4 verified that lost a pocket effect that is a role for oil storage existing in the range of surface roughness in leakage 3. As a result, the oil leakage quantity knew increasing a tendency. In the showing from this experimental results, the condition of surface roughness being the most suitable for oil leakage control can conclude with 0.26~0.48㎛.
Conducting Behavior of Carbosilane Dendrimers Including Palladium Ions
Kim, Chungkyun,Koo, Bon-Won,Lee, Sang-Bak,Song, Chung-Kun The Polymer Society of Korea 2002 Macromolecular Research Vol.10 No.3
The conducting behavior of dendritic carbosilanes including palladium ions (Pd$^{2+}$) has been measured. The palladium ion containing dendrimers were prepared by the addition of palladium dichloride to double-layered dendritic carbosilanes, which consist of phenylethynyl groups (-C≡CPh) on the outmost periphery as well as phenylethenyl and propyleneoxy groups (-CH=CPh- and (CH$_2$)$_3$O-) in the inner shell. By measuring conductivities, palladium ion containing dendrimers revealed an increasing tendency according to the increasing number of double bonds in the inner shells of dendritic carbosilanes.s.
Silane Arborols; XV:¹A Dendritic Carbosilane Based on Siloxane Tetramers
Kim, Chungkyun,Kwon, Aejeong 東亞大學校附設基礎科學硏究所 1998 基礎科學硏究論文集 Vol.15 No.1
An improved synthesis of the spherical dendritic macromolecule G2 with 36 allylic end groups starting from allyl alcohol and trichlorosilane as the building blocks and siloxane tetramers as core molecules is described. The formation of pure and uniform dendrimers was controlled by ¹H and ??? NMR spectra. MALDI mass spectra, and elemental analyses. The subsequent generation of G3P with 108 Si-Cl bonds starting from G2 could not be made uniform by repetition of key intermediate steps.
Diels–Alder reaction of anthracene on carbosilane dendrimer
Kim, Chungkyun,Lim, Kyung-In,Song, Chung-Gun Elsevier 2005 Journal of organometallic chemistry Vol.690 No.13
<P><B>Graphical abstract</B></P><P>The dendritic macromolecule with 4, 8, 16 and 32 bicyclo end groups on the periphery has been created by the Diels-Alder reaction of anthracene and maleimide. NMR and MALDI-TOF mass spectrum has characterized these products.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>The dendritic macromolecule with 4, 8, 16 and 32 bicyclo end groups on the periphery has been created by the Diels–Alder reaction of anthracene and maleimide. The dendritic skeleton with triple bonds has been prepared by the hydrosilation and the alkynylation of bis(phenylethynyl)dimethylsilane as a core. The peripheral anthracene on dendrimers has been substituted by the reaction of chlorosilyl groups containing dendritic generations and 9-anthracenecarbinol. NMR and MALDI-TOF mass spectrum has characterized these Diels–Alder products.</P>
Thermal Decomposition Evidence of Silylated Pyridine Derivatives
Kim,ChungKyun,Park,Eunmi,Choi, Soon-Kyu 東亞大學校附設基礎科學硏究所 1995 基礎科學硏究論文集 Vol.12 No.1
Thermal decomposition reaction of 2-methylenlsilyl- and 2-bis(trimethylsilyl) methylpyridine derivatives (2-4) with methanol imidazole and bromoform are progressed to collidine(1) and related thermolysis products(5-8). Decomposition rate of given compounds should be followed acidity of reactants.
Synthesis of Silafluorene on Dendritic Periphery
Chungkyun Kim*,Wonju Seo,Myeong-Jin Oh 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.11
Carbosilane dendrimers with silafluorenyl groups on the periphery were prepared by the reaction of 2,2'-dilithiumbiphenyl and dichlorosilyl groups on the carbosilane dendrimers at low temperature. The 1st to 4th generation of dendrimers with silafluorenyl groups were obtained with high yields and the products were purified by column chromatography. The unified properties of the dendrimers were measured by gel permeation chromatography (GPC) and displayed very low and regular polydispersity index (PDI) value. The silafluorenyl moieties on dendritic periphery accepted the potassium fluoride ions which were stabilized by criptand [222], and it proved strong photoluminescent properties.