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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Wood Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Wood Science Technology
Editor in Chief :
Volume & Issues
Volume 33, Issue 6 - Nov 2005
Volume 33, Issue 5 - Sep 2005
Volume 33, Issue 4 - Jul 2005
Volume 33, Issue 3 - May 2005
Volume 33, Issue 2 - Mar 2005
Volume 33, Issue 1 - Jan 2005
Selecting the target year
Annual Ring Formation of Major Wood Species Growing in Chuncheon, Korea (I) -The Period of Cambium Activity -
Kwon, Sung-Min ; Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 33, issue 4, 2005, Pages 1~8
The initiation and cessation of cambial activities were investigated to find out the growth characteristics of the major species growing in Chuncheon, Korea. The division of cambial zone in Pinus densiflora and Pinus koraiensis began from the middle of March through the end of March. The activity of cambial zone in P. densiflora and P. koraiensis was vigorous from the end of May through the middle of July. During this period the number of cells increased rapidly in radial direction. However, the number of cells in P. densiflora was gradually increased. The division of cambial zone in ring-porous wood, such as Quercus mongolica and Robinia pseudoacacia began in the middle of March, before the formation of vessel. The division of cambial zone in diffuse-porous wood, such as Cornus controversa and Prunus sargentii, began in early April, and then the formation of vessels began after one to three weeks. It was considered that the cambial zone in softwood was ceased from the beginning of November, whereas cambial activities in hardwood ceased in the middle of October. Consequently, the formation of growth ring was different among the species, even though the trees were grown under the same conditions.
Changes of Sound Absorption Capability and Anatomical Features of Wood by Delignification Treatment
Kang, Chun-Won ; Lee, Nam-Ho ;
Journal of the Korean Wood Science and Technology, volume 33, issue 4, 2005, Pages 9~14
Changes of sound absorption capability and anatomical features of wood by delignification treatment was estimated. Sound absorption coefficients of wood and delignificated wood had been measured by the two microphone method and anatomical changes of delignificated wood examined by SEM observation. The sound absorption coefficients of delignificated wood generally seemed to be higher than those of normal specimen. Especially, in the frequency range of 2 to 4 KHz, they was about 50% higher than those of normal specimen. Abundant small cracks generated on the cross sectional surface of delignificated wood and the weight of delignificated wood decreased about 8% than that of normal wood. It was considered that the small cracks formed by delignification treatment behaved as a sound absorbing pore.
Viscoelastic and Acoustic Characterization of Coatings for Stringed Instruments
Choi, Jae-Hoon ; Lee, Byoung-Hoo ; Kim, Hyun-Joong ; Chung, Woo-Yang ;
Journal of the Korean Wood Science and Technology, volume 33, issue 4, 2005, Pages 15~22
The acoustic properties of various coatings for stringed musical instruments made were investigated. The applied coatings were urethane topcoat, oil stain, natural varnish, cashew and UV-curable epoxy coating. Acoustic properties of coatings inferred from a resonance frequency and a damping measured by FFT analyzer and tan
measured by DMTA. Acoustic properties from resonance frequency and damping were analyzed. Optimum coating for stringed instruments was determined by viscoelastic properties and acoustic properties of coating.
Studies on Color Classification of Fancy Veneer Flooring Board with HSI Color Model
Seo, Jun-Won ; Park, Byung-Su ; Chong, Song-Ho ; Park, Heon ;
Journal of the Korean Wood Science and Technology, volume 33, issue 4, 2005, Pages 23~29
The fancy veneer flooring board is high value-added wooden material. The classification of the flooring boards by the observation with the naked eye causes color difference among fancy veneers. It turned out that this inaccuracy of color difference among fancy veneers increased in case of the identification by metamerism or the flooring construction. Therefore, this study was performed to classify fancy veneers produced from 3 species such as Tilia sp., Betula sp., and Acer sp. which were identified with the naked eye by Light and Dark grade, by using CIELAB. In addition, each specie's threshold on CIERGB was investigated and a range of hue, saturation and intensity by an application of HSI color model were studied. Intensity of the HIS color model could be the best value to be used when color, saturation and intensity of the HSI color model were used for the classification of the flooring board's color. In addition, it seemed that color range of all three criteria lied between 45
. In the case of identification by threshold of RGB element, considering only specific color element value is unlikely to lead to accurate classification of fancy veneers of flooring board.
Effect of Heating and Steaming Treatments on Residual Resin Content and Color Change of Radiata Pine Juvenile Wood
Kim, Su-Won ; Kang, Ho-Yang ;
Journal of the Korean Wood Science and Technology, volume 33, issue 4, 2005, Pages 30~37
Heating and Steaming treatments were carried for deresinning and color change of radiata pine juvenile wood. The boards of 20 mm and 30 mm thicknesses were heat-treated at 150
for 2, 4 and 6 hours and steamed at 100
for 6, 24 and 48 hours. For extracting residual resin in treated boards and measuring wood surface color, alcohol-benzene solution and a portable colorimeter were used, respectively. The board of 20 mm thickness were deresined effectively by heating at over 150
for 2 hours or steaming for 6 hours while that of 30 mm thickness by steaming for 48 hours. For the board of 30 mm thickness treatment time was more influencing on deresinning than treatment temperature. The steamed boards showed higher L* than the heat-treated for both thicknesses. L* decreased with the increase of treatment temperature and time, but for the board heat-treated at 220
it didn't change after 4 hours. The surface color of the boards heat-treated at 220
for 4 and 6 hours were obviously changed, but those at 150
were not. It was revealed that the core of the heat-treated board was color changed as well as the surface.
A Study on Combustion Characteristics of Fire Retardant Treated Wood
Park, Hyung-Ju ; Kang, Young-Goo ; Kim, Hong ;
Journal of the Korean Wood Science and Technology, volume 33, issue 4, 2005, Pages 38~44
This study was carried out to investigate the combustion characteristics of flame retardant treated wood by water-soluble flame retardants which are made from mixture of aqueous solution of monoammonium phosphate, sodium borate and zinc borate. The combustion characteristics for flame retardant treated wood were carried out using thermal analysis (TGA, combustion heat) and flame retardant test (LOI, flame propagation). The results of thermal analysis and flame retardant test are as follows; 1) The sample treated by F4 showed excellent flame retardant effects in almost all of combustion characteristics. 2) From TGA curves, all the samples undergo pyrolysis and oxidation in two main discrete steps. 3) The effect of flame retardant for softwood is higher than those for hardwood, and the combustion heat has decreased with increase of the content of flame retardant. 4) LOI values are almost similar in flame retardant treated wood samples. The range of LOI is from 24 to 30. However, these values are much higher than LOI value of non-treated wood sample. 5) The blended aqueous solution had a final in the range of about pH 8.4, and a slight odor of ammonia.
Expression of a Manganese Peroxidase Gene (mnp5) from White rot fungus Phanerochaete chrysosporium in the Pichia pastoris
Lee, Jae-Won ; Yang, In ; Igarashi, Kiyohiko ; Samejima, Masahiro ; Choi, In-Gyu ;
Journal of the Korean Wood Science and Technology, volume 33, issue 4, 2005, Pages 45~52
The manganese peroxidase (mnp5) from white-rot fungus Phanerochaete chrysosporium has been heterologously expressed in the methylotrophic yeast Pichia pastoris. The majority of the rMnP5 (recombinant MnP5) produced by P. pastoris exhibited an approximate molecular mass 45 kDa considerably larger than that of the predicting mnp5 due to two glycosylation sites of mnp5. After site direct mutation treatment, the effect of N-linked hyperglycosylation was examined by enzyme activity. Analysis by sodium dodesyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Coomassie Brilliant Blue (CBB) staining revealed a major protein band with a molecular mass of 37 kDa. Enzyme activity of M-rMnP5 (mutant recombinant MnP5) was similar to that of rMnP5, indicating that hyperglycosylation did not affect the active site. In this work, active mnp5 was successfully expressed in P. pastoris, suggesting that P. pastoris has potential capability of producing active heme-containing proteins.
Changes in Extractives of Pine Woods Treated by Blue Staining Fungi
Cho, Nam-Seok ; Lee, Jong-Kyu ;
Journal of the Korean Wood Science and Technology, volume 33, issue 4, 2005, Pages 53~59
This study was performed to understand the changes in wood extractives, mainly acetone extracts, in pine woods (Pinus densiflora and Pinus rigida) treated by three blue stain fungi (BSF) such as native BSF in Korea, Leptographium sp., screened Albino strain (BSFcs-1) and commercial Cartapip. BSF treatment has significantly reduced acetone extracts, 25.1-30.4% decreasing in red pine and 22.9-28.1% in pitch pine. The decreasing rates of fatty acids and sterols in woods were 10.6-11.2% by 3 week aging and 36-41.1% by BSF treatments, respectively. Triglycerides were also decreased to 5.68-9.4% by 3 week aging and 38.5-40.0% by BSF treatments, respectively. Resin acids were 6.1-11.3% by 3 week aging and 36-41.5% by BSF treatments, respectively. There were not so significant differences in extracts among native BSF and Albino-type strains (Albino strain, BSFcs-1, and commercial Cartapip). It was known that the Albino strain (BSFcs-1) screened for the biocontrol of wood discoloration has effectively decreased acetone extractives in pine woods.
Manufacturing of Korean Paper (Hanji) with Indian Mallow (Abutilon avicennae Gaertner) as the Alternative Fiber Resources (III) - Characteristics of Chinese Ink Spreading Distance by Korean Paper with Indian Mallow -
Jeong, Seon-Hwa ; Cho, Nam-Seok ; Choi, Tae-Ho ;
Journal of the Korean Wood Science and Technology, volume 33, issue 4, 2005, Pages 60~65
This study was carried out to investigate the sheet properties of Indian mallow Hanji, made by different pulping methods, such as alkali and sulfomethylated pulpings, and different stock compositions, various mixing ratios of bast fiber and wood core fibers. Indian mallow Hanjis made with 60% of woody core pulps were shown better Chinese ink spreading distance than those of the others. The Chinese ink spreading distance of the Indian mallow Hanjis made from bast fiber pulp only were unsuitable for Hwaseonji. The Chinese ink spreading distance of Indian mallow Hanji was closely related to the mixing ratio of long fiber and short fiber. Especially sulfomethylated pulping method was superior to alkali pulping method.