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- 저자 : ( Ree-keun Kong ) (검색결과 2 건)
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Effects of Air-Dried Leaves of Evergreen Broad-Leaved Trees on Sound Absorption Property
( Su-young Jung ),( Ree-keun Kong ),( Kwang-soo Lee ),( Hee-seop Byeon ) 한국목재공학회 2021 목재공학 Vol.49 No.5
This research was conducted to analyze the sound absorption effect of air-dried leaves from two evergreen tree species found in Korea's warm-temperate and subtropical regions. As eco-friendly sound absorption materials, Dendropanax morbiferusa, and Fatsia japonica leaves were prepared in three specimen units sizes 0 .5 × 0 .5㎠, 1 .0 × 1 .0㎠, and 2 .0 × 2 .0 ㎠, and each of them was formed at a thickness of 1.00 cm, 1.75 cm, and 2.50 cm. The measured sound absorption coefficients (SAC) for 18 conditions were comparatively analyzed in this study. The SAC of both tree species was significantly improved by increasing the dried leaf layer thickness. These results showed a more consistent and distinct trend for both tree species under the condition of 0.5 ㎠ in dried leaf size compared to other leaf specimen sizes. However, as the thickness increased, the difference in sound absorption effect according to the leaf size tends to decrease overall. In the case of D. morbiferus, there was no significant difference in SAC based on leaf size under the condition of 2.5 cm thickness (p < 0.05). The highest mean SAC was found in a 2.5 cm thick condition with a leaf size of 0.5 × 0.5㎠, 0.549 for D. morbiferusa, and 0.594 for F. japonica, respectively.
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( Su Young Jung ),( Da-hye Yeom ),( Ree-keun Kong ),( Gab Gyun Shin ),( Kwang Soo Lee ),( Hee Seop Byeon ) 한국목재공학회 2020 목재공학 Vol.48 No.5
In this study, the effect of specimen size and layer thickness on the sound absorption of the leaves of two evergreen broad-leaved tree species, Dendropanax morbiferus and Fatsia japonica, was investigated. The specimen sizes of 0.5 × 0.5, 1.0 × 1.0, and 2.0 × 2.0 cm<sup>2</sup> and layer thicknesses of 1.00, 1.75, and 2.50 cm were considered. At the layer thickness of 2.5 cm, the leaf of the D. morbiferus showed no significant difference in sound absorption coefficients (SACs) as the sample size varied, however, a significant change in SACs was recorded in that of the F. japonica. At 1.0-cm thickness, the SACs of the F. japonica leaf varied more remarkably with the sample size. The 2.50-cm-thick F. japonica leaf with the specimen size 0.5 × 0.5 cm<sup>2</sup> exhibited the highest sound absorption effect among all samples investigated.
ScienceON
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