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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 40, Issue 6 - Nov 2012
Volume 40, Issue 5 - Sep 2012
Volume 40, Issue 4 - Jul 2012
Volume 40, Issue 3 - May 2012
Volume 40, Issue 2 - Mar 2012
Volume 40, Issue 1 - Jan 2012
Selecting the target year
Study of the Changes in Wood Properties by Gamma Irradiation
Yoon, Min-Chul ; Park, Byung-Soo ; Kim, Ik-Joo ; Choi, Jong-Il ;
Journal of the Korean Wood Science and Technology, volume 40, issue 4, 2012, Pages 229~236
DOI : 10.5658/WOOD.2012.40.4.229
This study was conducted to investigate the effect of gamma radiation on cell wall degradation, cellulose crystallinity, and flexural strength of Pinus densiflrora, Zelkova serrenata, and Paulownia tomentosa. By the gamma radiation at the dose up to 100 kGy, the cell wall degradation was not detected with scanning electron microscope (SEM) observation from all samples, and the flexural strength was not significantly changed. Cellulose crystallinity was neither changed by the gamma radiation. This high stability of wood against gamma radiation means that the radiation technology can be used for eradicating fungal and insect infestation of wood without the changes in wood properties.
Changes of Sound Absorption Capability of Wood by Organosolv Pretreatment
Kang, Chun-Won ; Choi, In-Gyu ; Gwak, Ki-Seob ; Yeo, Hwan-Myeong ; Lee, Nam-Ho ; Kang, Ho-Yang ;
Journal of the Korean Wood Science and Technology, volume 40, issue 4, 2012, Pages 237~243
DOI : 10.5658/WOOD.2012.40.4.237
Sound absorption capability and anatomical features of the organosolv pretreated Japanese larch and yellow poplar wood were estimated by stereoscopic observation and two microphone transfer function method. Sound absorption capabilities of organosolv treated wood, in the entire estimated frequency range (50~6,400 Hz), were higher than those of control specimen. Especially, the treated wood's absorption capabilities measured in the frequency range of 2~4 kHz were about two times higher than those of control specimen. By the organosolv pretreatment (at
), the weight loss of wood occurred in less than 1% of total weight of wood and the porosity of wood increased slightly. In addition, it was presupposed that microstructural changes of wood occurred during organosolv pretreatment and this structural changes cause the increasing of the sound absorption capability of wood.
Anatomical Properties of Major Planted and Promising Species Growing in Indonesia
Kim, Jong-Ho ; Jang, Jae-Hyuk ; Kwon, Sung-Min ; Febrianto, Fauzi ; Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 40, issue 4, 2012, Pages 244~256
DOI : 10.5658/WOOD.2012.40.4.244
The anatomical characteristics of the ten Indonesian wood species (Gmelina, Jeunjing, Mangium, Durian, Gandaria, Jengkol, Kupa, Mangga, Nanaka and Rambutan) were investigated by optical microscopy. All the species were diffuse-porous with solitary and radial pore multiple. In Mangium, however, tangential pore multiple was observed as well. Tangential diameter of pore was larger than that of radial one except for Jeunjing and Nangka. Nangka showed the largest tangential diameter of pore among the species. Vessel number per
of Mangium, Gandaria and Kupa was higher than that of the other species. Especially Kupa showed highest vessel number. The tangential width of axial parenchyma cell in Gmelina, Mangium, Kupa and Mangga was larger than that of wood fiber, while the other species showed the opposite trend. Mangium was the largest in tangential width of axial parenchyma cell. Rays were homocellular composed only of procumbent cell in Gmelina, Jeunjing and Rambutan. Heterocellular rays composed of procumbent cells in the body and one row of upright and/or square in the margin are observed in Gandaria. Mangium, Durian, Jengkol, Kupa, Mangga and Nangkabody showed heterocellular rays composed of procumbent cells in the body and mostly 1~2 rows of upright and/or square cells in the margin. Crystals occurred in Durian, Gandaria, Jengkol, Jeunjing, Mangga and Rambutan and silica in Jeunjing and Mangga.
Evaluation of Physical Properties of Korean Pine (Pinus koraiensis Siebold & Zucc.) Lumber Heat-Treated by Superheated Steam
Park, Yong-Gun ; Eom, Chang-Deuk ; Park, Jun-Ho ; Chang, Yoon-Seong ; Kim, Kwang-Mo ; Kang, Chun-Won ; Yeo, Hwan-Myeong ;
Journal of the Korean Wood Science and Technology, volume 40, issue 4, 2012, Pages 257~267
DOI : 10.5658/WOOD.2012.40.4.257
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
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
. 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.
Anatomical Characteristics of Korean Mistletoe (Viscum album var. coloratum)
Kwon, Sung-Min ; Jang, Jae-Hyuk ; Kim, Chul-Woo ; Kim, Kwang-Mo ; Yi, Jae-Seon ; Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 40, issue 4, 2012, Pages 268~275
DOI : 10.5658/WOOD.2012.40.4.268
This study was carried out to understand the anatomical characteristics of Korean mistletoe (Viscum album var. coloratum) and host tree of Mongolian oak (Quercus mongolica) by the aid of light and scanning electron microscopy. The branch diameter of host tree at the parasitic part by mistletoe is larger than that of non-parasitic part. In the mistletoe, phloem consists of bast fiber and parenchyma cell and xylem is composed of fiber, ray and axial parenchyma cell, and vascular tracheid. The volume of ray parenchyma cell is higher than common wood species and is heterocellular made up of procumbent, upright, and square cells in the mistletoe. In the vascular tracheid of mistletoe, coarse spiral thickenings and bordered pit are present. Due to the insertion of the mistletoe haustorium, some deformed vessels but no tylosis are observed in the mistletoe. The shapes of mistletoe haustorium are sharp, and the destruction of the host tree cells due to the insertion of the mistletoe haustorium are not identified.
Antifungal activity of essential oil from Cryptomeria japonica against dermatophytic fungi
Kim, Seon-Hong ; Lee, Su-Yeon ; Hong, Chang-Young ; Jeong, Han-Seob ; Park, Mi-Jin ; Choi, In-Gyu ;
Journal of the Korean Wood Science and Technology, volume 40, issue 4, 2012, Pages 276~286
DOI : 10.5658/WOOD.2012.40.4.276
In this study, the antifungal activity of Cryptomeria japonica essential oil against superficial and allergic fungi, Trichophyton schoenleinii, Trichophyton tonsurans, Trichophyton mentagrophytes, Trichophyton rubrum, Epidermophyton floccosum, and Aspergillus fumigatus, was evaluated for determining the potential compound as dermatitis treatment. Minimum Inhibitory Concentration (MIC) measurement, TLC bioassay and agar dilution methods were used for determining the antifungal activity of crude essential oil and its fractions from C. japonica. Also, their major constituents were analyzed by GC/MS. The MICs were below 500 ppm at all superficial fungi, and spot 1 of C. japonica essential oil showed highly effective antifungal activity by TLC bioassay. In antifungal activity by agar dilution methods, crude oil showed high antifungal effect at more than 500 ppm and fraction D was significantly effective at even 100 ppm except for A. fumigatus. The major compounds of spot 1 and fraction D of C. japonica oil determined by GC/MS were elemol,
-eudesmol, which could be used as atopic dermatitis treatment material.
Shear Strength of Nailed Connection of Domestic Plywood as a Substitute for OSB
Suh, Jin-Suk ; Hwang, Sung-Wook ; Hwang, Kweon-Hwan ; Jeong, Gi-Young ; Joung, Ha-Hyun ;
Journal of the Korean Wood Science and Technology, volume 40, issue 4, 2012, Pages 287~293
DOI : 10.5658/WOOD.2012.40.4.287
This study was carried out in order to compare nail shear strength between domestic plywood and imported OSB for structural sheathing members as infill wall of wooden construction. The differences of nail shear strength between parallel-to-grain direction and perpendicular-to-grain direction of sheathing material to frame material were distinct at the plywood composition. The shear strengths of plywood and OSB with nail met current design values. The plywood of P-4 type, which uses MLH at surface layer and constructs 7 ply, showed greater than OSB regardless of grain direction of sheathing material to frame material. When the plywood as sheathing material to frame material was used, it was found out that the overall construction of perpendicular-to-grain direction of plywood had greater nail shear strengths than the construction of parallel-to-grain.
Enzymatic Hydrolysis Condition of Pretreated Corncob by Oxalic Acid to Improve Ethanol Production
Lim, Woo-Seok ; Lee, Jae-Won ;
Journal of the Korean Wood Science and Technology, volume 40, issue 4, 2012, Pages 294~301
DOI : 10.5658/WOOD.2012.40.4.294
In this study, we investigated the features of bioethanol fermentation of corncob biomass after oxalic acid pretreatment as well as enzymatic hydrolysis. The enzymatic hydrolysis was performed with Accellerase 1000 and the highest yield of monomeric sugars (
) was obtained at
and pH 4.5 for 96 hrs hydrolysis period. For the ethanol fermentation the monomeric sugars obtained from pretreated corncob were subjected to the biological treatment using Pichia stipitis CBS 6054. It was turned out that ethanol production from oxalic acid pretreated corncob was the most feasible at 10~14% of biomass loading as well as 15 FPU enzyme amount. Under these fermentation condition, the ethanol yield was approached to 0.47 after 24 hrs fermentation period, which was corresponded to 92.2% of conversion rate.