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- 저자 : 박용건 ( Yong Gun Park ) (검색결과 5 건)
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박용건 ( Yong Gun Park ),장윤성 ( Yoon Seong Chang ),양상윤 ( Sang Yun Yang ),여환명 ( Hwan Myeong Yeo ),이미림 ( Mi Rim Lee ),엄창득 ( Chang Deuk Eom ),권오경 ( Oh Kyung Kwon ) 한국목재공학회 2015 목재공학 Vol.43 No.1
목재 이용의 측면에서 중요한 인자 중 하나인 수축률에 관한 다양한 연구가 수행되고 있다. 버니어 캘리퍼스를 이용하여 치수를 측정할 때, 목재 시편에 작용하는 외력에 의해 왜곡된 치수가 측정될 수 있고, 시편의 양이 많으면 치수측정에 많은 시간이 소요된다. 스캐너를 이용하여 획득한 이미지로 치수를 측정하고, 수축률을 계산하면 외력이 작용하지 않아 치수 측정의 오류를 줄일 수 있고, 한 번의 스캔으로 여러 시편의 이미지를 획득하여 시간을 단축시킬 수있다는 장점이 있다. 스캔 이미지 상에서 목재 시편과 배경 사이의 경계면을 뚜렷하게 구분할 수 있도록 threshold 방법을 적용하여 치수 측정을 용이하게 하였다. 이미지를 이용하여 측정된 목재 시편의 치수는 버니어 캘리퍼스를 이용하여 측정한 값보다 다소 크게 측정되었으며, 버니어 캘리퍼스보다 높은 정밀도로 수축률을 계산하기 위한 스캔 이미지의 최대 픽셀 길이는 0.053 mm/pixel인 것을 확인하였다. Wood shrinkage, an important study subject with regard to the use of wood, has long been studied by researchers. However, when the size of a wood specimen is measured, distortion must be taken into account, which can be accomplished by applying external force on the wood specimen. However, when measuring a large number of specimens, this technique can be a lengthy process. If the size is measured and the shrinkage is calculated from images acquired with a flatbed scanner, it is possible to reduce the error in the measurement and to shorten the measurement time because the images of many specimens can be acquired with one scan. To clearly establish the boundary between a wood specimen and the background in a scan, an image threshold method was applied here. The size of a wood specimen measured by means of a scanner image was found to be longer than the value determined with a vernier caliper. The maximum pixel size of a scan image for highly accurate shrinkage calculations compared with the use of a vernier cal-iper was 0.053 mm/pixel.
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박용건 ( Yong Gun Park ),엄창득 ( Chang Deuk Eom ),박준호 ( Jun Ho Park ),장윤성 ( Yoon Seong Chang ),김광모 ( Kwang Mo Kim ),강춘원 ( Chun Won Kang ),여환명 ( Hwan Myeong Yeo ) 한국목재공학회 2012 목재공학 Vol.40 No.4
본 연구에서는 과열증기를 이용한 열처리 공정 제어 방법을 설계하고 적용하였다. 170°C, 0.4 MPa 조건의 과열증기에서 약 10시간 동안 열처리한 잣나무 판재의 물리 및 역학적 성질 변화를 무처리재 및 220°C 상압조건에서 일반 열처리한 목재와 비교하였다. 과열증기 처리재는 무처리재에 비해서 수분 흡습량 및 평형함수율이 낮아졌으며, 종압축 강도 및 휨 강도가 증가하였다. 흡습성은 일반 열처리재와 비슷하였으며, 일반 열처리 시발생하기 쉬운 내부 할렬은 발생하지 않았다. 또한 과열증기 처리에 의해서 잣나무 내부에 있는 다량의 송진이 제거되는 효과도 나타내었다. In this study, the method for heat treating wood using superheated steam (SHS) was designed and applied. The physical and mechanical properties of Korean Pine (Pinus koraiensis Siebold & Zucc.) lumber heat-treated by SHS at 170°C and 0.4 MPa for 10 hours were compared with those of non-treated and normal heat-treated wood. The amount of adsorbed water and equilibrium moisture content of the SHS treated wood were lower than non-treated wood. On the other hand the compressive strength parallel to grain and the bending strength of SHS treated wood were higher than those of non-treated wood. The hygroscopicity of SHS treated wood was similar to normal heat treated wood at 220°C. Internal checks that often occur during normal heat treatment were not developed at SHS treatment. Also, SHS treatment are effective in control of internal checks occurrence and resin exudation.
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속초시, 양양군, 인제군 지역의 산림전통지식 향토자원 분류에 따른 목재 수종식별 연구
이현미(Hyun Mi Lee),전우석(Woo Seok Jeon),박찬열(Chan Ryul Park),윤새민(Sae-Min Yoon),박용건(Yong Gun Bark),김건호(Gun-Ho Kim),황원중(Won-Jung Hwang) 한국가구학회 2020 한국가구학회지 Vol.31 No.4
In this study, wood species of old houses, pavilions, and farm equipment was investigated in the Seoraksan area (Sokcho-si, Yangyang-gun and Inje-gun in Gangwon Province) according to the classification of traditional forest knowledge (TFK). Three species, Pinus sp., Larix sp. were identified. It was confirmed that the columns, stairs, and beams of the pavilion were undergoing initial deterioration, and the deterioration was also found in the columns, rafters, door frames, and beams of the old houses. The degree of deterioration was analyzed by using microscopic observation, which could not be investigated by visual observation, As a result, the wood members in pavilion and old houses were identified as Pinus was identified. A total of 16 Pinus and 1 Larix were identified. From the visual observation and microscopic observation, the degree of wood deterioration was evaluated, and the destruction of epidermal cells, fusiform ray and piceoid pit were revealed. The aim of this study was to develop a classification system for traditional forest knowledge to preserve Korea’s traditional forest knowledge and to provide sustainable use and basic data. Furthermore, a database according to the wood classification system will be developed from the continuous literature research and field research.
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한연중 ( Yeon Jung Han ),장윤성 ( Yoon Seong Chang ),박용건 ( Yong Gun Park ),정기영 ( Gi Young Jeong ),홍정표 ( Jung Pyo Hong ),이전제 ( Jun Jae Lee ),여환명 ( Hwan Myeong Yeo ) 한국목재공학회 2013 목재공학 Vol.41 No.6
본 연구에서 국산 낙엽송재의 공학목재로의 이용가능성, 특히 교호집성재 라미나로서의 이용가능성을 확인하기 위하여 열기건조 중과 건조 후 판재 내 잔류응력을 분석하였다. 연구결과를 통해 이쿼라이징 처리에 의한 함수율 동일화 효과가 증명되었고, 컨디셔닝 처리에 의한 잔류응력의 감소효과가 정량화되었다. 건조 중 목재 내 잔류응력 분석을 위하여 프롱법과 슬라이스법을 실시하였다. 프롱 제작 후 표면경화율을 측정하였고, 슬라이스의 절단 후 탄성변형량을 기준으로 표면으로부터 약 10 mm 깊이까지의 건조응력을 정량적으로 분석하였다. T10-C4와 T12-D5 열기건조 스케줄 적용 시 열기건조 중 판재 표면의 인장응력과 압축응력은 모두 2.2 MPa을 넘지 않음을 확인하였다. 낙엽송의 횡단방향 인장강도와 압축강도가 평균 2.65 MPa, 4.60 MPa인 점을 고려하면, 더욱 강한 건조스케줄 적용이 추천된다. 건조 후처리에 의해 폭굽음과 비틀림을 약 40% 줄일 수 있었다. The objective of this study was to analyse the residual stress in Larix kaempferi board during and after kiln-drying. The boards were primarily intended for using as laminar of cross laminated timber (CLT). In this study, the equivalence of moisture content by equalizing treatment was proved and reduction of residual stress by conditioning treatment was quantified. Prong test and slice test were carried out to analyse the residula stress in wood during drying. Transverse casehardening was measured immediately after making prong sample. Residual stress of four parts in wood from surface to center was analyzed quantitatively based on elastic deformation after just cutting slices from board. Tensile stress and compressive stress on the surface of board during drying did not exceed 2.2 MPa when boards were dried by kiln-drying schedule of T10-C4 and T12-D5. Because the tensile strength and compressive strength of transverse direction of Larix kaempferi lumber are 2.65 MPa and 4.60 Mpa, application of more severe drying schedule can be recommended. Cup and twist were reduced by about 40% by equalizing and conditioning treatments after drying.
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