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김병삼,Kim, Byeong-Sam 한국과학기술단체총연합회 1996 과학과 기술 Vol.29 No.6
지난 3월 미 캘리포니아서 열린 제35회 미국독성학회는 30여개국서 5천여명의 독성학자들이 참석해 1천8백여편의 논문이 발표되었다. 이 학술대회에 참석하고 돌아온 울산대 김병삼교수의 참관기를 싣는다.
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Tribological Characteristics of TiC, TiN and TiC/TiN Coatings
김병삼 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.3
The tribological properties of TiC, TiN and TiC/TiN coatings on steels prepared by the cathodic-arc (CA) ion plating technique were investigated. Experiments were carried out on a tribo-test machine using a Falex journal V block system. The friction and wear characteristics of the coatings were determined by varying the applied load and sliding speed. The TiC, TiN and TiC/TiN coatings markedly increased the tribological characteristics of the surface. As far as a single layer coating was concerned, TiN goes better results than TiC. However, the TiC/TiN multilayer coating performed better than either single layer coating. The major factor in the improved performance of the multilayer coating was the role of TiC in improving the adhesion between the external TiN layer and the substrate steel.
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김병삼,김우진 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.6
Internal combustion engine is the main source of environmental pollutants and therefore advanced technology is required to reduce harmful elements from the exhaust gases all over the world. Especially, when the exhaust gas is released from the automotive muffler, exhaust noise has many bad influence on the surrounding environment. In order to reduce the exhaust noise, it is necessary that automotive muffler must be designed for best exhaust efficiency. The sound insulation room was installed for the analysis of an acoustics characteristics of the noise from automotive muffler, in this study. Exhaust gas noise, noise distribution characteristics, pressure and temperature of exhaust gas were investigated with the change of annulus temperature of air cooled annulus automotive muffler and cooled annulus automotive muffler. The following results were obtained with this study. From the frequency analysis of automotive muffler, high noise distribution was observed in the range 100~2000Hz. It means that the noise in this range has an dominate influence for the overall noise. Noise reduction of automotive muffler was affected by the temperature of annulus. It is caused the result that the high temperature and pressure of exhaust gas are changed lower by the drop of annulus temperature. The tendencies of noise, the temperature and pressure of exhaust gas are similar to the performance curve of engine. Exhaust gas pressure is determined by the r.p.m. of engine and affected by the cooling performance of automotive muffler.
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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.
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Micro Grooving에 의한 도로교통 소음저감에 관한 실험적 연구
김병삼,이동필,김현수,김우진 한국기계기술학회 2024 한국기계기술학회지 Vol.26 No.1
In this study, an experimental analysis of noise reduction in road traffic by applying the Micro Grooving technique to concrete highway pavements is explored. Initiated in 1984 to address the aging and damage issues observed in South Korea's concrete highways, Micro Grooving is known for creating fine grooves on the cement pavement surface to increase friction, prevent hydroplaning, and inhibit ice formation, while reducing vehicle friction noise by 3∼5dB(A). It is determined from noise measurement results that the application of the Micro Grooving method can be expected to reduce roadside noise and enhance the safety of drivers' driving experience.
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