• Journal of the Korean Wood Science and Technology
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• 제51권3호
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• pp.173-182
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• 2023

Color is an attribute of visual perception and can be an important factor that affects the preference of customers toward bamboo and wood products. Solar radiation can discolor bamboo surfaces and initiate cracking. The purpose of this study is to investigate the effects of an ultraviolet (UV)-protective coating on the photodiscoloration of untreated and heat-treated Phyllostachys bambusoides bamboo surfaces. Artificial UVA radiators are set at a UVA irradiance of 2,000 W/m² to accelerate the aging of the outer surfaces of hot-air-dried and heat-treated bamboo samples. Half of the samples are coated with transparent UV-protective paint. As the UVA radiation progresses, the discoloration prevention efficiency (DPE) of the UV-protective coating on all samples decreases gradually. The DPEs of the hot-air-dried samples are estimated to be 31.4% and 18.8% after 21 and 72 hours of artificial UVA radiation, respectively. The heat-treated samples exhibit similar trends (29.0% after 21 hours and 10.3% after 72 hours). Recoating the UV-protective paint periodically every six months is expected to minimize the discoloration of the bamboo's outer surface.

• Journal of the Korean Wood Science and Technology
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• 제49권6호
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• pp.566-573
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• 2021

We investigated color changes on the outer surfaces of Phyllostachys bambusoides bam-boo by heat treatment under three different temperatures (180℃, 200℃, and 220℃) for three different durations (60 min, 90 min, and 120 min). A method of predicting the bam-boo surface color change after heat treatment was developed to provide valuable information and increase the added value of domestic bamboo products. The three average color parameters L^*, a^*, and b^* decreased, and the overall color changes increased as the severity factor increased. The values of L^* × a^* × b^* were highly related to the severity factor, and the optimal duration time for the desired bamboo surface color with a certain heat-treatment temperature could be estimated.

• Journal of the Korean Wood Science and Technology
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• 제46권1호
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• pp.107-113
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• 2018

본 연구에서는 대표적인 친환경 소재인 바이오복합재료(bio-composite)를 이용한 3D 프린터 필라멘트를 제작하였다. 바이오복합재료의 제조를 위해 매트릭스로는 생분해성 고분자인 poly lactic acid (PLA)를 그리고 충전제로는 대나무 분말(Bamboo flour)을 사용하였다. 대나무는 담양에서 생산되는 왕대, 솜대, 죽순대를 이용하였으며, 대나무 분말과 PLA의 혼합비율은 중량기준 10/90, 20/80, 30/70으로 설정하였다. 3개 죽종으로 제조한 대나무/PLA 바이오복합재료의 기본물성 평가를 위해 인장강도를 비교하였다. 그 결과, 왕대 분말/PLA의 비율이 10/90일 때의 인장강도가 7.12 MPa로 가장 높게 나타남으로써 3D 프린터 필라멘트 제작용 대나무/PLA 바이오복합재료로 가장 적합한 것으로 판단되었으며, 현미경 관찰 결과, 죽분의 함량을 더욱 낮춘 필라멘트를 제작할 필요성이 있다고 판단된다.

• 한국가구학회지
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• 제20권5호
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• pp.480-489
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• 2009

This study was carried out to develop the core technology for the manufacturing the flat floor panel with the bamboo grown in Damyang region maintaining its indigenous merits. Using capital bamboo(Phyllostachys bambusoides) of Damyang with superior physical and working properties, Authors have standardized the core technologies for the integrated production of flat floor panel using this superior bamboo i.e, washing, splitting, flattening, blasting, and overlaying over plywood. It is expected to increase the income from bamboo forest and to enhance the image of the eco-city, Damyang with this technological development. Additional quality assuring test and economical analysis for the industralization as building material will be performed.

• 한국식생활문화학회지
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• 제33권3호
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• pp.283-290
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• 2018

This study examined the quality characteristics and anti-oral microbial activity of bamboo leaf jelly prepared with different 5 levels (0, 10, 20, 30, and 40%) of bamboo (Phyllostachys nigra var. henonis) leaf extract. The sugar contents of bamboo leaf jelly were increased significantly by increasing the level of bamboo leaf extract. The luminance and Hunter's a values of the jelly samples increased with increasing bamboo leaf extract, but the 40% bamboo leaf jelly had the lowest Hunter's b values. The hardness, adhesiveness, gumminess, and chewiness increased significantly with increasing bamboo leaf extract. Among the mechanical properties, only the flavor of the jelly with 30 and 40% bamboo leaf extract were increased significantly. The extract of bamboo leaves had strong antimicrobial activity against S. mutans, S. sobriuns, P. gingivalis, and P. intermedia at a concentration of 40%. These results suggest that bamboo leaf extract can be useful in the production of high quality jelly.

• 임산에너지
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• 제22권1호
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• pp.17-23
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• 2003

3, 5, 7년생의 중국산 죽순대(Phyllostachys pubescense)를 탄화온도가 서로 다른 3 종류의 탄화로(전용, 개량 및 간이 탄화로)에서 제탄하고 얻어진 대나무 숯의 이화학적 특성을 검토하였다. 전용 탄화로(800 - 1,000℃)에서 제조한 대나무 숯의 고정탄소는 죽령이 증가함에 따라 감소하는 경향을 나타내었으나 비표면적의 경우 죽령에 따라 증가하였다. 요오드 흡착량은 5년생이 가장 높았다. 개량 탄화로(600 - 700℃)로 제탄한 경우 비표면적과 요오드 흡착량은 전반적으로 생육기간이 길어짐에 따라 증가하는 경향을 나타내었다. 간이 탄화로(400 - 500℃)에서 제조한 죽탄의 경우 휘발분이 개량 및 전용 탄화로보다 약 2배나 높음에도 불구하고 고정탄소는 80%이상의 높은 간을 나타내었다. 본 탄화로에서 5년생의 죽순대를 제탄하여 얻어진 대나무 숯의 경우 타 죽령에 비하여 가장 높은 비표면적과 요오드 흡착량을 나타내었다. 한편 3, 5년생의 중국산 죽순대로 제조한 대나무 숯은 동일 죽령의 국산 죽순대로부터 제조한 대나무 숯보다 물리적 성질이 비교적 좋지 않았다. 이것은 중국산 3, 5년생의 죽순대의 조직구조가 동일죽령의 국산보다 치밀하지 못한 것에 기인하는 것으로 생각되었다.

• Journal of the Korean Wood Science and Technology
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• 제46권3호
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• pp.231-240
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• 2018

대나무는 생장이 빠르고, 벌목주기가 짧으며, 목재와 비교하여 가격이 저렴하다는 장점을 가지는 주요 바이오매스 자원 중 하나이다. 따라서, 본 연구에서는 대나무재의 효율적 활용을 위한 기초자료를 수집하기 위하여, 국내산 맹종죽(Phyllostachys pubescens)의 1년생~5년생까지 죽령별로 해부학적 특성을 광학현미경과 주사전자현미경으로 비교 분석하였다. 또한 셀룰로오스의 결정특성을 X선회절법에 의해 분석하였다. 횡단면 관찰 결과, 유관속초의 크기는 1년생이 가장 작았으며, 2년생 이후 유사하였다. 수 부분에서 표피부로 갈수록 유관속의 분포밀도가 높았고, 유관속초의 발달 형태가 뚜렷하게 달랐다. 특히, 1년생 수 부분 유관속 중 세포간극에 인접한 유관속초가 발달 되지 않은 유관속이 드물게 출현하는 것이 관찰되었다. 구성세포 치수 측정 결과, 섬유길이는 1년생이 가장 짧았으며, 모든 년생에서 표피부가 수 부분보다 길었다. 유관속의 방사 및 접선방향 폭은 모든 년생에서 접선방향 폭이 더 컸으며, 2년생부터는 큰 차이를 보이지 않았다. 도관 직경 및 내층 두께는 1년생의 값이 가장 작았으며, 도관 직경은 2년생 이후, 내층 두께는 3년생 이후부터 유사한 값을 보였다. 상대결정화도는 모든 년생에서 표피부로 갈수록 높은 값을 보였으며, 1년생의 값이 가장 낮고, 2~5년생은 비슷한 값을 보였다. 결론적으로, 국내산 맹종죽은 죽령별로 조직구조에 있어 정성적 및 정량적 차이가 있었으며, 2~5년생의 특성은 비슷한 경향이 있었다. 따라서, 1년생은 미성숙한 상태이며, 2년생 이상의 대나무는 성숙한 상태로 조직구조적으로 안정된 특성을 갖는 것으로 사료된다.

• 한국산림과학회지
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• 제34권1호
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• pp.47-56
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• 1977

I have investigated and compared the morphology of vascular bundle shown in the section of culm wall of bamboo trees growing on Mt. Jiri which were classified by Grosser and Liese with their methods of morphological classification. The results obtained were as follows: 1. It was shown that there are no b.g.i. types of bamboo classified by Grosser and Liese among the bamboo trees on Mt. Jiri (Phyllostachys and Sasa). 2. As for the thickness of the culm wall in the culm, it was shown that the culm wall of the Phyllostachys becomes thinner in proportion to its nearness to the upper part of the tree, but no distinctive difference appeared in the Sasa. 3. The c, d, and e types of Sasa were the same as those of the Phyllostachys, but there was a vascular bundle type of the a' type, which was quite different from that of the Phyllostachys. 4. It was shown that the a', d, and e types of Sasa were distributed in a zone less than 500m above sea level, but no a' type was distributed in the high mountain area except for the c, d and e types which ranged from 600m to 1000m above sea level. Such facts mean that the vascular bundle sheath has changed in quantity because of the height of mountain. 5. In general, as compared with the Phyllostachys, the Sasa (types a, c, d and e which included a new type a) have fewer vascular bundles. 6. Considering the above results, it is thought that not by the current Sasa classification method based on observation of the the study of Sasa form the outside, but by a new method of classification based on the aspect of the physiological construction as seen from the inside wall is advanced. I believe this new method of classification to be a first step towards an epoch-making methodological advance and encourage the further study of it.

• Journal of the Korean Wood Science and Technology
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• 제23권4호
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• pp.67-73
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• 1995

This study was undertaken to investigate the effect of heat treatment on the dynamic viscoelasticity of three species of Phyllostachys bambusoides, Phyllostachys nigra var. henonis and Phyllostachys pubescens, grown in southern Korea. The bamboo was treated for 3~24 hours at $60{\sim}180^{\circ}C$, and then was treated in a climatic chamber for 3~48 hours at $40^{\circ}C$ and 95% relative humidity. The results obtained are summarized as follows : 1. Dynamic Young's modulus decreased with increasing temperature and duration of the heat treatment. 2. Internal friction decreased with increasing treatment duration. 3. Moisture absorption decreased with increasing temperature and duration of the heat treatment. 4. Dynamic viscoelasticity decreased, whereas internal friction slowly increased, with increasing moisture content.

• 임산에너지
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• 제22권2호
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• pp.26-35
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• 2003

Bamboo strand board (BSB) was made with Phyllostachys banbusoides growing in Damyang district. Physical and mechanical properties of this BSB were summarized as follows; The specific gravity of BSB was 0.63∼0.79. Specific gravity decreased slightly with the thickness and length of BSB. Moisture content of BSB manufactured was 5.8∼6.9%. The absorption ate of BSB (42∼48%) did not show any relationship with the thickness and length of BSB. The thickness swelling rate of BSB was 13.9∼17.0%, relatively higher than any other panel products. Thickness swelling rate increased with the thickness of BSB, showing the strand thickness influenced much more on the rate of thickness swelling of BSB than the length of strand. The 3-point bending strength of BSB was 98∼126kgf/$\textrm{cm}^2$. Bending strength of showed the tendency of increase with the increased length of BSB, but with the decreased thickness. In particular, the length of BSB showed more effect on the increase of bending strength of BSB than the thickness of BSB. The compression strength perpendicular to BSB surface was 411 ∼ 465 kgf/$\textrm{cm}^2$, and the optimal length of strand for the 1mm- and 2mm-thickness of strand was 40mm and 60mm, respectively. Compression strength paralleled to BSD was 160∼221kgf/$\textrm{cm}^2$ and the optimal length of strand for the 2mm-thickness of strand appeared to be 60mm. The present work showed that appearance, physical and mechanical strength of BSB appeared quite positive in terms of board qualities, suggesting that bamboo would be appropriate for the production of board materials. In addition, our work showed that the crucial factor for determining the mechanical characteristics of BSB was the dimension of strand.