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공승택 ( Seung Tack Kong ),김현우 ( Hyun Woo Kim ),김현수 ( Hyun Soo Kim ),김정은 ( Jeong Eun Kim ),정진하 ( Jin Ha Jeong ),안소연 ( Soh Yeon Ahn ),김태경 ( Tae Kyung Kim ),이진형 ( Jin Hyung Lee ),한상욱 ( S W Han ) 전북대학교 과학교육연구소 2013 과학과 과학교육 논문지 Vol.38 No.2
소리의 도플러효과에서 음원의 주파수 변화를 정량적으로 측정하기 위하여 로봇을 이용하여 움직이는 음원의 속도를 정확히 조절하여 측정된 주파수의 변화를 도플러 효과의 이론적인 계산식과 비교하였다. 850Hz인 음원이 1.6 m/s의 속력으로 다가올 때와 멀어질 때 측정된 진동수는 각각 853.9 Hz와 846.1 Hz로 이론적인 계산 값 854.1 Hz와 845.9 Hz와 거의 같았다. 상온에서 측정된 음원의 도플러 효과는 빛의 도플러 효과와 마찬가지로 음원의 운동 방향에 따라서 소리의 적색 또는 청색 변이가 나타났으며, 이론적인 예측과 일치하였다. We examined the Doppler effect of sound waves by quantitatively measuring the speed of a sound source using a robot car and compared measured sound frequencies with calculated values. When an original sound wave frequency of 850 Hz was approaching and keeping away with a speed of 1.6 m/s, the frequencies were observed to be 853.9 Hz and 846.1 Hz which are quite similar to the theoretically calculated values of 854.1 Hz and 845.9 Hz. The measured Doppler effect of a sound wave at the room temperature showed a good agreement with the redshift and the blueshift which are theoretically expected.
저방사화 철강재료 (JLF-1)/STS304 이종재 마찰용접의 인장강도특성
박이현(Y. H. Park),김재웅(J. W. Kim),공유식(Y. S. Kong),이진경(J. K. Lee),이상필(S. P. Lee),윤한기(H. K. Yoon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
Development of reliable joints between JLF-1 steel and stainless steels are required. As known, different methods for joining various materials are assumed to be used for the construction of International Thermonuclear Experimental Reactor first wall, blanket, divertor and reactor vessel. Recently, joints technology development of JLF-1 steel (Fe-9Cr-2W-V-Ta) and Stainless steel(STS304) have been investigated for diffusion bonding, brazing, roll bonding, explosive bonding and hot isostatic pressing. On the other hand, a friction welding is one of the most popular welding method for joining between different materials such as a tube. Not only the development of optimizing of friction welding with more reliability and more applicability but also the development of in-process real-time weld quality evaluation technique by acoustic emission for dissimilar friction welding of nuclear reactor component(JLF-1 and STS304) were carried out.