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박혜나(Hye-na Park),김난행(Nan-Hang Kim),손장열(Jang-Yeol Sohn) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The impact noise from upper floor especially in Korean On-Dol system causes acoustics problems the downstair neighbors.<br/> This study is the relative comparison for the floor hydronic system and the dry double floor hydronic system through the impact noise experiment. In this study, the impact noise levels of 4 floor structures were measured in the existing house. The test results of the impact insulation performance for the dry double floor hydronic system show good improvement about the light-weight noise and heavy-weight noise before and after installation of the respectively systems.
박혜나(Hye-Na Park),한승원(Seung-Won Han),김정중(Jung-Joong Kim),손장열(Jang-Yeul Sohn) 한국생활환경학회 2005 한국생활환경학회지 Vol.12 No.1
According to the growing population and increased the use of machinery, indoor noise which is invisible pollution, is threatening human health. Indoor noise can be absorbed, deflect, refract, and reflect sounds. In addition, the vibration of a sound wave is absorbed by leaves, branches and soil. Therefore, by understanding the properties of indoor sound environment in accordance with the availability of indoor plants, a basic study on the indoor noise reduction effect of plantation in an indoor space was conducted. In this study, experiments were conducted by grouping into the space with no plantation, the space where 3% of total room volume was planted with Spathypyllum, and the space where 3% of total room volume was deployed with paper-based structures. High frequency non-directional sound source (Supper Tweeter Source) was set up in an indoor space (5.0m×5.0m×2.5m) to measure indoor noise. We could know that 1) in terms of reverberation time under different frequency range, reverberation time significantly decreased under 1 ㎑, 2 ㎑ and 4 ㎑ frequency range on the plantation status. And 2) Each arrangement type had substantial effect on reducing reverberation time and on increasing acoustic absorptivity in low frequency range. 3) Among arrangements types, equipartition type of plantation was most effective in reducing reverberation time. 4) Sound absorption effect of the plantation status was better and in particular, it was much more effective in a low frequency band. In overall, it showed that it is effective in reducing the noise stress of people in a room.
오진균(Oh, Jin-Kyun),박혜나(Park, Hye-Na),손장열(Sohn, Jang-Ryul) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.4
Nowadays, the construction sites are growing in city every year, so complaints for construction noise have increased more and more. To analyze this noise scientifically, construction noise prediction program was developed in 1998 and 2005 but it is too difficult to apply program in field because there is few soundproof facilities and it can't understand the coordinate system and so on. The aim of this study is to develop noise prediction program to apply in construction sites. For this, the problems of existing program was analyzed and survey was performed to get requestion of field overseer and upgraded program. To get reliability of program, it was compared with sound measurement value in field. As a result, construction sound prediction program have various soundproof facilities data than existing program. It can also analyze multi receiver point at the same time for several construction machinery. Most of all, it is more powerful to set receiver or source in the axis of X, Y, Z. so program user can make use of it easily. An average of difference is -0.9~1.8 dB.