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전진용(Jin-Yong Jeon),장형석(Hyung-Suk Jang),허재영(Jae-Young Heo) 한국생활환경학회 2013 한국생활환경학회지 Vol.20 No.4
Speech announcements in public places are difficult in delivering messages especially for elderly persons: as hearing deteriorates with age, understanding spoken words are difficult in noisy and reverberant spaces. In this study, the acoustical characteristics of the reverberation-induced speech announcements on the subway platforms have been investigated on the basis of hearing ability of elderly persons. In three platforms, the RTs were from 0.69 to 1.54 seconds at 1 kHz and the SPLs were varied by arriving and departing of the trains. Listening tests were performed by 20s young students and over 65-year elderly persons for the recorded sounds at different acoustical environments. As a result, high frequency boosted signals were effective to improve the speech intelligibility in noisy environment for the elderly.
전진용(Jeon, Jin-Yong),정영(Jeong, Young) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.10
Damping materials for reducing heavy-weight floor impact noise in reinforced concrete structures were tested in apartment buildings. The effect of damping materials and an impact isolator were compared with an on-site experiment conducted in a high-rise apartment building. The loss factor of damping material analyzed more than 2 times than rubber to $1.5{\sim}2.3$, could know that Damping layer has excellent attenuation performance in side of vibration reduction. The results showed that the resonance frequency increased but vibration acceleration level decreased when the damping materials were used. The heavy-weight impact sound levels of the structure decreased substantially at 63 Hz, whereas the sound levels of the structure with the impact isolator increased.