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완충재 유무에 따른 표준중량충격원에 의한 콘크리트 바닥 구조의 소음 및 진동 특성
송희수,전진용,서상호 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.8
The characteristics of noise and vibration by a heavy impact source was studied. The triggering method was used for increasing the reliability and stability to measure the level of sound pressure. sound intensity and vibration acceleration. A simple finite element model and a rigid body analysis method were suggested to calculate the natural frequencies of the multi-layer floor system. The results show that the resilient materials decrease the natural frequency of the reinforced concrete slab, make a resonance with dominant driving frequency in the low frequency region, and increase the vibration and noise level. A simple finite element model and rigid body models was suggested to calculate the natural frequencies of the floor systems.
송희수,전진용 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1
In this study, the sound absorption characteristics of foam aluminum which is an environment-friendly materials for buildings is elucidated and the effect of sound absorption coefficient is measured by applying to the existing gymnasium. This experiment reports that the sound absorption coefficients by various sealing are similar and in measuring the coefficient by thickness, it results in the best efficiency at the thickness 21mm of foam aluminum and mounting depth 50mm. In the simulation of room acoustics, the reverberation time of the existing gymnasium is decreased by about 0.6sec, and the definition(D50) is improved by about 10%
Synthesis of Ag nanostructures by green chemistry method
김성욱,박준표,송희수,송진희,박성수 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Noble metal nanocrystals with controlled sizes and shapes have received great interest in recent years due to the strong correlations between the size and shape of a nanocrystals and its electronic, optical, magnetic and catalytic properties. The interest has also been augmented by the technological applications of these nanocrystals in various areas including catalysis, sensing, imaging, and biomedicine. The various research groups have produced Ag nanostructures by natural reducing agents like tea, coffee, various plant extracts and polysaccharides. But the yield or product they obtained was polydispersed which is not feasible for commercial purpose. we wanted to synthesize the monodispersed shape controlled Ag nanocrystals by using natural reducing agents and trace amounts of capping agents like PVP, citrate etc which will have no harm to environment in negligible amounts . The samples were charicterized by the means of TEM, SEM, PSA, UV-VIS-NIR spectroscopy and XRD.
정정호 ( Jeong Ho Jeong ),송희수 ( Hee Soo Song ),전진용 ( Jin Yong Jeon ),조문재 ( Moon Jae Cho ) 한국감성과학회 2002 춘계학술대회 Vol.2002 No.-
최근 사무환경에서 컴퓨터 사용시간이 급증함에 따라 컴퓨터 소음의 불쾌감으로 인한 저소음형 컴퓨터에 대한 요구가 증가하고 있다. 이에 따라 효율적인 소음조절을 위하여 컴퓨터 소음에 대한 실태 조사를 위하여 설문조사를 실시하였으며, 물리적 측정치와 더불어 심리음향학적 각종 파라메타를 계산하였다. 또한 일반적 업무 Task가 주어진 상태에서 컴퓨터 소음에 대한 근무자의 상하한계치 설정을 위한 청감실험을 실시하였다. 설문조사 결과, 가장 시끄럽게 인식되는 소음은 팬소음(사용자 컴퓨터)과 키보드 사용음(타인 컴퓨터)으로 나타났으며, 약 55%의 사용자들이 보통 컴퓨터 소음에 대해 시끄럽게 느끼고 있는 것으로 나타났다. 또한 현재 사용중인 컴퓨터의 소음에 대해 사용자의 약 20% 정도만이 조용하게 느끼며, 컴퓨터 소음이 업무효율을 떨어뜨린다는 응답도 약 35%로 나타났다. 팬소음, CD-Rom 구동음, HDD 작동음에 대해 청감실험을 실시한 결과, 각 소음의 상하한치는 각각 31∼51dB(A), 34∼54dB(A), 34∼58dB(A)로 나타났다.