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김병삼,정동근,김기석 ( Byong Sam Kim,Dong Geun Jung,Kiseok Kim ) 한국공업화학회 1997 응용화학 Vol.1 No.1
2-methyl-3`-hydroxy-1, 1`-diphenylamine was synthesized from the mixture consisting of 3-aminophenol, 3-nitrophenol, and 2-methyl cyclohexanone via vapor phase reaction on 5% Pd/C catalyst. Reaction was allowed to proceed at 203℃ for 5 to 10 hrs in an autoclave-type high pressure reactor. The optimal composition of the reaction mixture was 1 : 2 : 48 in the molar ratio of 3-aminophenol : 3-nitrophenol : 2-methyl cyclohexanone, and the highest yield of diphenylamine derivative was ca. 90% after 6 hrs of reaction time, based on the moles of aminophenol plus nitrophenol introduced. The rate-determining step of overall reaction was lydrogen-abstraction of the intermediate, N-cyclohexylideneaniline species, which was readily formed via condensation of aminophenol and excess cyclohexanone derivative. The hydrogen abstracted was transferred to nitrophenol, which was easily converted to aminophenol via reduction, thus replenishing the aromatic amine reactant for formation of the intermediate. The mechanism of overall reaction was in essence identical to that previously observed in formation of 2-methyl-4-methoxy diphenylamine, a raw-material of fluoran heat-sensitive dye.
이태근(Lee, Tae-keun),김병삼(Kim, Byong-sam) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.2
As automobile technology advances, a smoother ride with less noise is desired. In order to achieve these purposes, a study on the vibration and noise produced by a moving automobile was carried out and a model for tire vibration characteristics which influence the ride performance was developed. The model was verified through simulations and experiments. The developed model was then applied to a half car model and automobile vibrations were analyzed. The effects of tire design parameters on the automobile vibration energy were investigated. The results from laboratory and field tests confirm the validity of the analytical model. The 17-DOF half-car model was built to analyze automobile vibration. The characteristics of the nonlinear model for a shock absorber were applied to this model. The results from the present 17-DOF half car model incorporating the analytical tire model with tire design parameters, were compared with the 5-DOF half car model where the tire was modeled with linear springs. The results of the 17-DOF model are close to the experimental results. Using the 17-DOF model, the influence of tire design parameter were considered. According to the analysis results, the vibrations at seat/body/wheel were predicted by simulation and experiment.