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김무상(Moosang Kim),남경욱(Kyoung-Uk Nam) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper introduces the process of reducing the automobile wind noise by using acoustic holography. First, a microphone array scans a side or plane under an automible step-by-step. Second, a pressure on a source plane is calculated. Third process is to analyze how much individual sources contribute to interior noise. Fourth process is to control important noise sources determined by the contribution analysis. This paper deals with the entire process, theoretical and experimental problems.
Field emission and x-ray effect on RAON half-wave resonator (HWR) superconducting cavity performance
Jeon Sungmin,김희태,Jung Yoochul,Kim Juwan,Lee Junwoo,Kim Moosang,Kim Hyunik,Lee Sangbeen,Lee Minki 한국물리학회 2022 Current Applied Physics Vol.38 No.-
Performance of superconducting cavities are investigated with field emission effect and x-ray detection. Conducting particles and surface curvature can cause field emission from the surface of the superconducting Nb cavity. The field emission makes the local temperature increase and the quality factor decrease. Vertical test is performed for half-wave resonator (HWR) cavities. The vertical test facilities are introduced and the quality factors are measured for the half-wave resonator (HWR) cavities. The quality factors of the cavities decrease as the x-ray are increased. The surface resistance and x-ray generation of the cavity can be fitted well with the field emission theory. The quality factor for the half-wave resonator (HWR) cavities decreases linearly with the field enhancement factor for x-ray generation.