• KIEAE Journal
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• v.3 no.4
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• pp.23-31
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• 2003

From 1998, the number of household who live in apartment house outnumber that of household live in detached dwelling by 0.3% in Korea. As walls and floors are shared with neighbourhood in apartment houses, percent complaints to the impact noise from the upper floor was so high that it represents an important factor in apartment indoor noise. And the rate is closely correlate with children's running, playing and jumping. In this study, comparisons of standard impact source, such as Tapping Machine and Bang Machine, with real life impact sources were made in order to investigate acoustical characteristics between them. Also reproducibility tests for impact sound sources were carried out.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.505-508
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• 2004

단열완충재 제품간의 경량충원 저감성능 평가를 객관적이고 신속하게 판별하기 위하여 실험실용 시험장치를 개발하였다. EVA계열 및 EPPㆍEPS계열의 단열완충재들에 대한 경량충격원 시험에서 제품간의 성능비교가 가능하였으며, 동탄성계수 및 손실계수 측정과 병행함으로써 제품들간의 우열성을 보다 정밀하게 평가할 수 있었다.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.26 no.2
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• pp.130-140
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• 2016

Floating floor is most commonly used at apartment houses in Korea for thermal insulation and reducing impact noise. But it in proven that the floating floor is not effective for reducing the floor impact noise in low frequency range. In most cases, impact sound pressure level under 63 Hz frequency band were actually increased by the resonance of resilient material, lightweight concrete and the finishing mortar installed on it. In this paper, an integrated floor system consist of 70 mm light weight concrete and 40 mm finishing mortar successively installed on the concrete slab was suggested to avoid the resonance. Integrated floor system increases total flexural stiffness and mass per unit area. The natural frequencies of first and second vibration mode were increased and acceleration response and floor impact sound level was decreased in all measurement range.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2014.04a
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• pp.259-260
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• 2014

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.33 no.9
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• pp.36-46
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• 2004

• 주택과사람들
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• s.164
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• pp.35-40
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• 2004

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2014.10a
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• pp.197-202
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• 2014

Floor Impact Noise is a structure-borne noise which is mainly caused by vibration of concrete slabs. The majority of previous studies have focused on investigating performance of absorbing sheets on the reduction of floor impact noise. But absorbing sheets do not efficiently reduce heavy-weight floor impact noise level because it cannot absorb slab vibration, which is the fundamental noise source. In this study, double-floor system was developed in order to reduce floor impact noise level in residual buildings. This floor system reduces heavy-weight impact noise level by reducing vibration response at the center of slab, which has maximum amplitude in the 1st vibration mode. In order to identify the performance of the double-floor system, experiments were planned. Primary test parameters are span of double floor, arrangement and types of absorbing sheets.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.11a
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• pp.593-594
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• 2008

The purpose of this study is to review and to suggest improvement concerning floor impact noise section of the housing performance grading indication system. After a result, the main improvement is to resolve the discrepancies in the rules or regulations such as design specification(standard floor system) or design performance(accredited floor system) and as-built performance like 58 dB.

• Proceedings of the SAREK Conference
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• 2007.06a
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• pp.145-145
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• 2007

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2014.04a
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• pp.265-266
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• 2014