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이정재(Jung-Jae Lee),홍천화(Cheon-Wha Hong),송명준(Myoung-Joon Song),곽지영(Ji-Young Kwak),이열(Yeol Lee) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.2
An experimental study has been carried out to improve the performance of a commercial abrasive blasting nozzle, by simply redesigning the nozzle"s inner contour. The analytical 1-D code, that can evaluate both the frictional effects on the nozzle inner wall and the sphericity effects of the particle, is utilized to calculate the dynamics of the particle inside the nozzle. The analytical results are compared to the experimental ones, that were obtained from images of the particle streaklines downstream from the nozzle exit. It is noted that the particle velocity at the redesigned nozzle exit increases as compared to the original commercial nozzle.
건축자재에서 발생되는 VOCs 와 HCHO 의 방출농도 평가
유복희(Yoo. Bok-Hee),박용승(Park. Yong-Seung),홍천화(Hong Cheon-Hwa),김정호(Kim. Jeong-Ho),김신도(Kim. Sin-Do) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The purpose of this study was to estimate of the emission factor from building materials. We performed the mock-up room test to investigate the VOCs and HCHO emission concentrations involving five kinds of the building materials. As the result, we knew that those of TVOCs and HCHO emission characteristics are high emission factor at initial time and decreased in course of time. The TVOCs predict concentrations by calculated from individual building materials were good correlation with measurement.