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( Yeonjung Han ),( Sang-min Lee ) 한국목재공학회 2021 목재공학 Vol.49 No.6
Improving public awareness of wood is essential for achieving the goal of establishing wood culture by expanding the use of wood. This study presents a basic examination of the strategy of revitalizing wood culture and a survey of its current status and requirements. The survey was divided into seven categories: awareness of wood culture; use characteristics of wood culture; preference and demand for wood culture; awareness of sub-fields of wood culture; awareness of the cultural resources of wood; trends of wood utilization; and wood-related living environment. Based on the survey results, the study analyzed four items: awareness of wood and cultural experience; awareness of the cultural resources of wood; wood-related living environment and trends of wood utilization; and preference and demand for wood culture. In this study, the public awareness of wood and cultural experiences, the first of four items, was analyzed using the survey results. Generally, wood and wood culture are viewed as materials and a cultural heritage, respectively. Moreover, wood is ecofriendly. However, no substantial difference was observed between the two perceptions. Forty-five percent of the respondents reported that using wood exerts a positive effect on the body and mind. However, such use also destroys forests. Additionally, the recognition of wood-related workers, such as engineers or skilled workers, was relatively low compared with educators, such as wood education experts. Moreover, less than 50% of the respondents answered that major projects related to wood culture are well-known, whereas 30% participated in wood education, such as woodworking experience, where the majority required hand tools. Furniture, wooden accessories, and wooden buildings were among the objects that individuals intended to make through the wood culture program. Approximately 23% of the respondents were aware about the wood culture experience center, while approximately 50% had visited it. The response rate to woodworking technology was 73%, where the highest response was found for wood education experts. To improve public awareness about wood, the importance of entertainment factors over educational factors should be considered in the experience of individuals. To provide opportunities to experience wood culture for more individuals, developing and actively promoting various contents, including entertainment elements, are necessary.
( Yeonjung Han ),( Sang-min Lee ) 한국목재공학회 2021 목재공학 Vol.49 No.6
In order to establish a strategy for revitalizing wood culture, a survey was conducted on the level of public awareness of wood culture and the experience of wood cultural resources by type. According to the survey, 31.4% of respondents had the images of cultural heritage such as palaces, temples, Hanoks, and cultural assets for wood cultural resources. The main reasons for having no image of wood cultural resources were the ambiguous concept and lack of interest in wood cultural resources. The importance of wood cultural resources classified into seven categories was in the order of cultural heritage, architecture of wood, cultural facilities, cultural festivals, wood products, cultural education, cultural contents. In the survey on the necessity and sufficiency of information on wood cultural resources, 46.7% of respondents needed more information to experience of wood cultural resources, while 64.8% of them had lacked information about wood cultural resources. More than half of the respondents wanted to experience of wood culture within next year, but about 20% of respondents participated in seven kinds of wood cultural resources, except wood products used in daily life. Based on these results, a systematic strategy should be developed to expand the opportunity for the public to experience of wood cultural resources and to promote them to public.
A Study on Classification of Wood Cultural Resources in South Korea
( Yeonjung Han ),( Sang-min Lee ),( Jinyoung Choi ),( Chun-young Park ) 한국목재공학회 2021 목재공학 Vol.49 No.5
The recent social atmosphere has been a preference for wood utilization and woodworks. The general public does not have many opportunities to enjoy wood culture, so there is a lack of awareness and foundation of wood culture. In this study, classification and case analysis of wood culture were conducted as basic research for establishing a promotion strategy for the general public to enjoy wood culture. The specificity of wood culture and cultural resources was analyzed to establish the concept of wood cultural resources. Through the analysis, wood cultural resources were defined as products created as a result of human activities that implied the cultural value of wood and wood use in terms of conservation, discovery, and utilization. The types of wood cultural resources were classified into seven categories using the classification examples performed on cultural resources: cultural heritage, cultural facilities, cultural festival, wood architecture, culture contents, culture education, and wood products. In addition, cases were searched and proposed for each type of wood cultural resources.
Han, Yeonjung,Park, Yonggun,Chang, Yoon-Seong,Chung, Hyunwoo,Eom, Chang-Deuk,Yeo, Hwanmyeong Walter de Gruyter und Co 2017 Holzforschung Vol. No.
<P>Cross-laminated timber (CLT) panels - consisting of several cross-wise stacked layers of glued boards - have a high dimensional stability. However, the outer surfaces of CTL are exposed to environmental humidity changes and thus to swelling and shrinking. To improve CLT's dimensional stability further, the layers of kiln dried (KD) CLT were substituted partly (on the surfaces) and entirely with superheated steam treated (SHST) wood. The effects of SHST wood and the performance of the one-component polyurethane resin (PUR) were tested by block shear and delamination tests after water soaking. Under various conditions, the shear strength ranged from 1.3 MPa to 4.7 MPa and the wood failure percentage (WFP) from 76% to 92%. The optimal parameter were ascertained as pressing time (30-45 min), pressure (0.98 MPa) and adhesive amount (175-200 g m(-2)). The water soaked delamination of CLT manufactured with SHST wood was approximately 50% lower than that of CLT made of KD wood.</P>
( Yeonjung HAN ),( Chang-Deuk EOM ),( Sang-Min LEE ),( Yonggun PARK ) 한국목재공학회 2019 목재공학 Vol.47 No.6
Air drying depends on species, density, dimension of wood, the geographical location of the air drying yard, and the meteorological factors of air drying site. If there are four seasons with large difference in temperature and humidity like in Korea, the research of the meteorological factors is required in air drying site. In this study, effective air drying days (EADD) of 24 regions in Korea were calculated by using the average monthly temperature, relative humidity, and wind speed. The EADD in 24 regions in Korea was ranged from 239 days to 291 days, with an average 265 days. This result is 5 days increased compared to the average of EADD calculated using the meteorological factors from 1955 to 1984. The results of multiple regression analysis on the EADD and meteorological factors showed that EADD affected in the order of temperature, relative humidity, and wind speed. As a result of dividing Korea into 4 zones of EADD, the zones of EADD were moved northward compared to previous study due to global warming. As basic data for predicting the moisture content (MC) distribution of Korean red pine logs during air drying conducted in Seoul, the average monthly temperature, relative humidity and wind speed for three years from 2016 to 2018 were presented, and the corresponding changes of the equilibrium MC were analyzed.
잎갈나무와 일본잎갈나무의 해부학적, 물리·역학적 특성 비교
한연중 ( Yeonjung Han ),김민지 ( Min-ji Kim ),이현미 ( Hyun-mi Lee ),강진택 ( Jin-taek Kang ),엄창득 ( Chang-deuk Eom ) 한국목재공학회 2017 목재공학 Vol.45 No.5
The study aims to observe the cellular anatomical properties of Dahurian larch and Japanese larch for the species identification. In addition, other factors - the ring width, tracheid length, density, and strength - were compared and analyzed to clarify their physical and mechanical properties. To the end, three Dahurian larch trees and three Japanese larch trees by each diameter class were collected as specimens from Jeongseon-eup, Jeongseon-gun, Gangwon-do, to conduct a stem analysis. It was found that the average stand age, average diameter at breast height, and average tree height of three Dahurian larch trees and Japanese larch trees were 74 years and 51 years, 442 mm and 352 mm, and 26.1 m and 20.8 m, respectively. The cellular anatomical difference between Dahurian larch and Japanese larch can be usually found by spiral thickening, considering that it doesn`t occur in Dahurian larch at all, while rarely does in the ray tracheids of Japanese larch. However, in this study, spiral thickening was not observed in the radial section of Japanese larch. The average annual growth diameters measured at 1.2 m-height of Dahurian larch and Japanese larch were 5.167 mm and 5.954 mm, respectively. Meanwhile, arboreal growth of Japanese larch was observed to be higher than that of Dahurian larch. In the physical properties test, it was measured that the latewood proportion and oven-dry density of Dahurian larch with low annual diameter growth were higher than those of Japanese larch, while the mechanical properties of Dahurian larch wood were measured 2-7% higher than those of Japanese larch wood. The data obtained from this study are expected to be used as the basic reference for species identification between Dahurian larch and Japanese larch by DNA analysis.
한연중 ( Yeonjung Han ),이상민 ( Sang-min Lee ),손동원 ( Dong Won Son ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.1
목공·DIY 교육 및 공방에서는 재료의 수급과 경제성의 문제로 수입집성판이 주로 이용되고 있으며, 교육과 체험 등에 이용되는 디자인이 집성판을 중심으로 설계되고 있다. 이에 따라 목공·DIY 현장에서는 재료의 수급이 용이하고 가격경쟁력을 갖춘 국산재를 요구하고 있지만, 국산집성판은 생산구조의 문제로 가격경쟁력을 갖추기 힘든 상황이다. 본 연구는 목공·DIY제품의 소재로써 국산 활엽수 제재목의 가능성을 제시하고자 제재목에 적합한 가구 디자인을 제시하고, 아까시나무, 층층나무, 산벚나무, 자작나무, 오리나무 등 5수종을 이용하여 테이블, 침대, 싱크대 등 10종의 원목가구를 제작하였다. 원목가구의 종류에 따라 이용된 활엽수 제재목의 수량은 차이가 있었으나, 10종의 제작에 쓰인 활엽수 제재목은 193본이었다. 제작과정에 이용된 국산 활엽수 제재목과 집성판의 경제성을 비교하고 활엽수 제재목의 체적 기준 탄소저장량을 산출하였다. 활엽수 제재목의 가격은 규격에 따라 차이가 있으나 평균 1,602,881원/㎥이었다. 이는 국산 잣나무 집성판의 가격인 3,006,584원/㎥의 53%이며, 수입된 편백, 자작나무, 스프루스 집성판의 평균 가격인 1,543,210원/㎥와 유사하였다. IPCC(Intergovernmental Panel on Climate Change)의 활엽수 기준인 밀도 0.56 kg/㎥, 탄소계수 0.5를 적용하여 산출한 활엽수 원목가구 10종의 탄소저장량은 0.37이었으며, 이산화탄소(CO<sub>2</sub>)저장량은 1.34 tCO<sub>2</sub>이었다.