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박상언(S. E. Park),김동규(D. K. KIM),이규현,김광희(K. H. KIM),이문용(M. Y. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
In roll forming process, a sheet metal is continuously progressively formed into a product with required cross-section and longitudinal shape, such as a circular tube with required diameter, wall-thickness and straightness, by passing through a series of forming rolls in arranged in tandem. In recent years, that process is often applied to the bumper rail in the automotive industries. In this study, a optimal front side member manufacturing technology, model deign and proper roll-pass sequences can be suggested by forming number of roll-pass and bending angle. And also effects of the process parameters on the final shape formed by roll forming defects were evaluated.
루비듐 - 87 원자 D₂ 전이선에 대한 광펌핑 포화분광
이호성(H. S. Lee),박상언(S. E. Park),조혁(H. Cho),박종대(J. D. Park) 한국광학회 1993 한국광학회지 Vol.4 No.2
루비듐-87 원자의 D₂ 전이선에 대해 Nakayama의 광펌핑 효과를 고려한 포화분광이론을 적용하여 공진신호의 상대적인 크기를 펌프광과 조사광의 편광 조합에 따라 계산하였고, 선폭 축소된 반도체 레이저를 사용한 실험결과와 비교해 보았다. 그 결과, 지자장을 차폐했을 때의 실험결과와 계산 결과는 잘 일치하는 것을 알았다. By applying the Nakayama's theory of saturation spectroscopy to (87)^Rb D₂ lines, taking into account the optical pumping process, the relative intensities of the resonance signals were calculated for various polarization combinations of pump and probe beams. The saturated absorption spectra were observed with a linewidth-narrowed semiconductor laser. As the result, it was found that the theoretical calculations were in good agreement with the experimental observations in the case where the geomagnetic field was shielded.