http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
윤혁채(Hyukchae Yun),조원오(Wonoh Cho),전인식(In Sik Jeon),임계규(Gye-Gyu Lim),정창구(Jeong Chang Goo) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
To improve lubricity, Zn-DTP and Mo-complex are used in lubricant as anti-wear additive and friction modifier each other. In this study, The effect of these additives (Zn-DTP and Mo-DTP) will be confirmed and evaluated by four kinds of test methods, Four-Ball E.P test, Four-Ball wear test, Falex Timken test and SRV test.
정근우(KeunWoo Chung),김영운(Young-Wun Kim),임도혁(Do Hyuk Im),조원오(Won Oh Cho) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
Room temperature ionic liquids (RTILs) have been attracting significant and growing interest as the lubricants, owing to their intrinsic useful properties such as good thermal stability, negligible vapor pressure, good low temperature properties, good flame retardant properties. In this study, several imidazolium-based ionic liquids, 3-alkyl-1-alkylimidazolium tetrafluoroborates, hexafluorophosphonates, trifluoromethane sulfonates, and bis(trifluoromethanesulfoimide), were synthesized. The physical properties of synthetic RTILs such as kinematic viscosity, RI, thermal properties were evaluated and their tribological behaviors of 4-ball WSD and friction properties as the lubricants were evaluated.
남경임(Kyung-Im Nam),김영운(Young-wun Kim),정근우(Keunwo Chung),조원오(Wonoh Cho),전인식(In-sik Jeon),정용미(Yong-Mi Chung) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.37 No.-
In this study, biodegradable base Li-greases were prepared by using Li-soap thickener and vegetable oils such as soybean oil, rapeseed oil, castor oil and synthetic ester. Also, EP-greases were formulated by blending base Li-greases, anti-wear additives, EP additives, anti-oxidants and corrosion inhibitor etc.. And EP-greases were characterized by analysing physical properties such as worked penetration, dropping point, 4-ball wear, extreme pressure, thermal properties etc. Biodegradability of base Li-greases and EP-greases were evaluated by CEC-L-33-A-93 method using several inoculums of domestic sewage treatment plant. As the results, biodegradability of vegetable oils were shown at the range of 97.1 to 98.4%. And biodegradability of base Li-greases and EP-greases were 86.2% ~ 89.3% and 83.4% ~ 90.0% which were lower value than those of vegetable oils due to effect of Li-soap thickener, respectively. Therefore, the EP-greases prepared in this study were easily biodegraded by microorgnism.
박정헌(Park, Jeong-Heon),이철희(Lee, Chul-Hee),김철현(Kim, Cheol-Hyun),조원오(Cho, Won-Oh) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.8
This paper presents vibration characteristics of magnetorheological(MR) elastomer, whose elastic modulus are controllable by applied magnetic field. By using this property, the material can be applied to vibration absorber, so that the stiffness of the absorber can be changed and actively controlled according to the magnetic flux density. However, the various performances of MR elastomer depends on different polarized direction of particles by applied magnetic field and dimension during the manufacturing process. In this paper, in order to obtain the optimal characteristics of MR elastomer, MR elastomers with different types and dimensions are prepared for a series tests. Using this test setup, extent of natural frequency shifted against magnetic field at various excitation frequencies can be measured. Specimens are prepared with 3 types, as cylinder samples exposed to magnetic field vertically, horizontally and unexposed during cure, respectively. Also, a set of design variables are considered to produce MR elastomers. Through the modal tests of mass structure with MR elastomer, the optimal design as well as the polarization direction of MR elastomer is obtained among the various dimensions and 3 directional types of MR elastomers.