Sound Absorption Property of Traditional Korean Natural Wallpaper (Hanji)

Jang, Eun-Kyung; Kang, Chun‐Won; Huang, Kang; Jang, Sang-Sik

doi:10.5658/wood.2018.46.6.703

Cited by 23 publications

(7 citation statements)

References 12 publications

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“…According to ISO 11654 (1997), NRC grades are divided into 5 grades: below 0.10 is no grade, grade E is 0.15 to 0.25, grade D is 0.3 to 0.55, grade C is 0.60 to 0.75, grade B is 0.80 to 0.85, and grade A is 0.90 to 1.00 (Jang et al, 2018b;Kim and Lee, 2017). As a result of this study, all dimension of Hinoki cypress cubes show D grade, that it has a sound absorption function.…”

Section: Results Of Sound Absorption Coefficientsmentioning

confidence: 99%

Investigation of Sound Absorption Ability of Hinoki Cypress (Chamaecyparis obtusa) Cubes

Jang¹

2022

J. Korean Wood Sci. Technol.

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Today, commercialized Hinoki cypress cubes are used for fragrance, humidification, and pillows in Korea. In this study, the sound absorption ability of Hinoki cypress (Chamaecyparis obtusa) cubes was examined. The three groups of Hinoki cypress cubes were prepared depending on their dimension (L: 9 × 9 × 9, M: 7 × 7 × 7, S: 4 × 4 × 4 mm). Their sound absorption coefficient was examined after filling 6, 8, 10, and 12 cm height in impedance tubes, respectively. Overall, the sound absorption ability depending on dimension was superior in the M group compared to the L and S groups. Also, as the filling height increased, the sound absorption capacity increased. In sum, noise reduction coefficients (NRC) of all Hinoki cypress cubes were 0.41-0.59. Thus, this research found that Hinoki cypress cubes have a sound-absorbing function.

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Section: Results Of Sound Absorption Coefficientsmentioning

confidence: 99%

Investigation of Sound Absorption Ability of Hinoki Cypress (Chamaecyparis obtusa) Cubes

Jang¹

2022

J. Korean Wood Sci. Technol.

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“…"Sound absorption" (164.6) was also ranked in the top 50. This is because studies have investigated the sound absorption performance in terms of the porosity of wood and natural resources such as forest byproducts as sound absorption materials (Jang, 2022a;Jang et al, 2018;Jung et al, 2021;Kang et al, 2019).…”

Section: According To the 2020 Korea Forest Resourcesmentioning

confidence: 99%

Text Mining of Wood Science Research Published in Korean and Japanese Journals

JANG

2023

J. Korean Wood Sci. Technol.

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Text mining techniques provide valuable insights into research information across various fields. In this study, text mining was used to identify research trends in wood science from 2012 to 2022, with a focus on representative journals published in Korea and Japan. Abstracts from Journal of the Korean Wood Science and Technology (JKWST, 785 articles) and Journal of Wood Science (JWS, 812 articles) obtained from the SCOPUS database were analyzed in terms of the word frequency (specifically, term frequency-inverse document frequency) and co-occurrence network analysis. Both journals showed a significant occurrence of words related to the physical and mechanical properties of wood. Furthermore, words related to wood species native to each country and their respective timber industries frequently appeared in both journals. CLT was a common keyword in engineering wood materials in Korea and Japan. In addition, the keywords "MDF," "MUF," and "GFRP" were ranked in the top 50 in Korea. Research on wood anatomy was inferred to be more active in Japan than in Korea. Co-occurrence network analysis showed that words related to the physical and structural characteristics of wood were organically related to wood materials.

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“…Pore size was measured by capillary flow porometry [32][33][34] using the standard method of ASTM F-316 [35]. This method's main characteristic is that it measures the constricted segments of only the through-pores to measure only the pores that affect permeability [25,31,[34][35][36][37][38][39]. The same equipment used for gas permeability was used to measure pore size.…”

Section: Pore Size Analysismentioning

confidence: 99%

Investigation of Sound Absorption Properties of Heat-Treated Indonesian Momala (Homalium foetidum (Roxb.) Benth.) and Korean Red Toon (Toona sinensis (A. Juss.) M. Roem.) Cross Sections

Jang

Kang

2021

Forests

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This study investigates the effects of heat treatment time and presence of an air back cavity on the sound absorption performance of Indonesian momala (Homalium foetidum (Roxb.) Benth.) and Korean red toon (Toona sinensis (A. Juss.) M. Roem.) cross sections. To examine the porous characteristics of the two species before and after heat treatment, gas permeability, pore size, and porosity analyses were conducted. Additionally, the sound absorption coefficient was measured based on various heat treatment times and air back cavity sizes. The results showed that, with heat treatment at 210 °C for 6 h, the gas permeability improved by 4.3% for the momala and 38.5% for the red toon, the maximum pore size was improved by 5.25% in the momala and 26.0% in the red toon, and the through-pore porosity improved by 22.7% for the momala and 117.0% for the red toon. Due to these pore structure changes, the noise reduction coefficient (NRC) of the heat-treated momala improved by 6.8%. When a 3-cm air back cavity was applied to the heat-treated momala, the NRC was improved to 92.5%. Similarly, when the same air back cavity was applied to the heat-treated red toon, the NRC was improved to 190.7%. This study demonstrated that an increase in pore size and through-pore porosity by heat treatment triggered an increase in the sound absorption coefficient. Additionally, when an air cavity was applied, the sound absorption coefficient of both heat-treated wood species was increased at low frequency. From the results of this study, we expected that heat-treated momala and red toon cross-sections can be utilized as eco-friendly ceiling materials with sound absorption function.

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Sound Absorption Property of Traditional Korean Natural Wallpaper (Hanji)

Cited by 23 publications

References 12 publications

Investigation of Sound Absorption Ability of Hinoki Cypress (Chamaecyparis obtusa) Cubes

Investigation of Sound Absorption Ability of Hinoki Cypress (Chamaecyparis obtusa) Cubes

Text Mining of Wood Science Research Published in Korean and Japanese Journals

Investigation of Sound Absorption Properties of Heat-Treated Indonesian Momala (Homalium foetidum (Roxb.) Benth.) and Korean Red Toon (Toona sinensis (A. Juss.) M. Roem.) Cross Sections

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