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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 31, Issue 6 - 00 2003
Volume 31, Issue 5 - 00 2003
Volume 31, Issue 4 - 00 2003
Volume 31, Issue 3 - 00 2003
Volume 31, Issue 2 - 00 2003
Volume 31, Issue 1 - 00 2003
Selecting the target year
Wood Based Composite and Indoor Air Quality
Kim, Hyun-Joong ; Lee, Young-Kyu ; Yang, Han-Seung ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 1~14
Resin Impregnation of Sawdust Board for Making Woodceramics(II)－ Effect of Density and Addition Rate of Phenol Formaldehyde Resin -
Oh, Seung-Won ; Byeon, Hee-Seop ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 15~22
This study was carried out to investigate the properties of sawdust board impregnated with phenol resin according to the density and resin content of board. The sawdust board were manufactured to target densities of 0.4, 0.5, 0.6, 0.7 g/
and resin content of 5, 10, 15, 20% made from Pinus densiflora S. et Z., Larix. kaemferi C. and Pinus koraiensis S. et Z. The impregnation process were executed in two ways, the application of vacuum pressure then followed by atmospheric pressure, and the application of vacuum pressure with ultrasonic vibration then followed by atmospheric pressure. The density of impregnated sawdust board increased as density and resin content of sawdust board increased, but impregnation rate decreased. The density, impregnation rate, bending strength and brinell hardness of sawdust board in impregnated vacuum pressure with ultrasonic vibration then nonpressure were higher than those of vacuum pressure then nonpressure. In this results, the impregnation rate is increased in vacuum pressure with ultrasonic vibration then nonpressure, it has affected the properties of sawdust board impregnated with phenol resin.
Physical Properties of Fabric E-glass Fiber Reinforced Laminated Timber (I)－ Mechanical Properties －
Jung, In-Suk ; Lee, Weon-Hee ; Byeon, Hee-Seop ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 23~35
This study was carried out to investigate the mechanical properties of fabric E-glass fiber reinforced laminated timber. Specimens used to Korean red pine(Pinus densiflora) and Japanese larch(Larix kaemferi). Fabric E-glass fiber was inserted in the solid wood with aqueous polymer-isocyanate resin(MPU-500). The results were as follows: 1. Aqueous polymer-isocyanate resin(MPU-500) was good resin to manufacture laminated timber. specially, it was satisfied to property standard of construction laminated timber(KS F 3021) except for two ply glass fiber. 2. Bending and shear strengths of solid wood inserted with fabric glass fibers were not different from control solid wood. But, proportional limit bending stress was increased following the number of fabric glass fibers. Therefore, it was considered that to improve the bending and shear strength of fabric glass fiber reinforced laminated timber, the glass fiber thickness and its mesh should be modified to fitness following working conditions.
Physical Properties of Fabric E-Glass Fiber Reinforced Laminated Timber (II)－ Peeling and vapor adsorption properties －
Jung, In-Suk ; Lee, Weon-Hee ; Kim, Jong-Man ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 35~42
This study was conducted to estimate peeling and vapor adsorption properties made with fabric glass fiber reinforced laminated timber according to our earlier report(Jung et al., 2002). In adsorption peeling test, three all types solid wood were not appeared the peeling. However, solid wood appeared to the peeling in boiling peeling test except for control wood. Vapor adsorption test was performed at
, 90% relative humidity for 48 hours. Cross sections were not different all solid wood. Radial section and tangential section with glass fiber were delayed vapor adsorption compared to control wood. In anisotropy of vapor adsorption, solid wood with glass fiber were small values.
Studies on Biological Activity of Wood Extractives(XIII)－ Chemical Components and Antioxidative activity of the leaves of Sophora japonica －
Park, Young-Ki ; Lee, Hak-Ju ; Lee, Sung-Suk ; Choi, Don-Ha ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 43~49
From the leaves of S. japonica, three compounds were isolated and identified as follows : hypogallic acid, kaempferol and quercetin. The free radical scavenging activities of the isolated compounds were 98.2%, 96.2% and 90.2% at 100
/ml, respectively. Compound 1 (hypogallic acid) and compound 2 (kaempferol) indicated higher antioxidative activity compared with reference compound, BHT.
Extractives of Pinus koraiensis wood
Lee, Hak-Ju ; Choi, Yun-Jeong ; Choi, Don-Ha ; Hong, In-Pyo ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 49~56
Two stilbenoids and five flavonoids were isolated from wood of Pinus koraiensis (Pinaceae). The chemical structures of isolated compounds were determined as : 5-hydroxy-7-methoxyflavone, chrysin, galangin, pinocembrin, pinobanksin, 3-hydroxy-5-methoxystilbene and pinosylvin on the basis of Mass and NMR spectroscopic data.
Weathering of Prunus sargentii Specimens Modified with Acetic Anhydride and Formaldehyde Vapor
Kang, Ho-Yang ; Kim, Su-Won ; Park, Sang-Jin ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 57~64
Small cherry specimens modified with acetic anhydride and formaldehyde vapor phase were weathered by outdoor exposure and accelerated conditioning in a climate chamber. The effects of the chemical modification were evaluated by measuring their weight percentage gains (WPG), hygroscopicity and color differences before and after weathering. The average WPGs of the 72 hour acetylated and formaldehyde-treated specimens were 8.1 and 15.7%, respectively. After outdoor exposure for more than 2 months, the acetylated specimens lost weights by only 1.5%, but the formaldehyde- treated did much more than the formers. It was revealed that acetylation reduced the hygroscopicity and discoloration of wood while formaldehyde treatment didn't. Moreover the longer is the formaldehyde treatment time the more degraded after weathering. It was concluded that the vapor-phase acetylation could be applied for improving the dimensional stability of old wooden blocks.
Evaluation of the Bending Properties of Glulam with Different Cross-Section
Lee, Jun-Jae ; Kim, Kwang-Mo ; Han, Jae-Su ; Kim, Jae-Keon ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 65~71
In this paper, bending capacities of glulams with different configurations of cross-section were evaluated. These configurations included horizontal(BH), vertical(BVN), vertical with vertical plywood (BVV) and vertical combination of lamination with horizontal plywood(BVH). Full-scale bending tests were performed to investigate the effect of different section configurations on bending strength (MOR) and stiffness(MOE) of glulam. Compared with type BH, MOR of glulam with type BVN configuration was improved about 23%, which was considered to be caused by defect dispersion effect, while MOE of glulams with these two types of configurations were similar. Because MOE of plywood is generally smaller than that of solid wood laminar, MOE of type BVH glulam decreased about 15%, but in the case of type BVV glulam, MOR was improved without any reduction of MOE. The reason of this result could be undersood in the view of shear-reinforcement effect, which was verified from analysis of fracture mode. From the results of this study, it was concluded that bending capacity of glulam could be improved by proper section design, such as laminar arrangement and shear reinforcement.
Distribution Characteristics of Bending Properties for Visual Graded Lumber of Japanese Larch
Lee, Jun-Jae ; Kim, Gwang-Chul ; Kim, Kwang-Mo ; Oh, Jung-Kwon ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 72~80
In reliability based design(RBD) method, the distribution characteristics of mechanical properties of material are basic input variable. Therefore, distribution type and parameters of mechanical properties should be determined accurately. Until now, the properties were derived from tests with small, clear specimens. However, the test conditions should emulate as nearly as possible the way in which the timber would be used in practice and the test results should, as closely as possible, reflect the structural end use conditions to which the timber products would be subjected. In this study, structural timbers (38mm by 140mm, 3.0m long) were graded by visual assessment of growth characteristics and defects. And then bending tests were conducted on 498 structural size timbers. For each grade, the distribution type and the parameters of mechanical properties were determined for each grade. For the determination of best-fit distribution type, comparing of square error between distribution types and KS test were conducted. Best-fit distribution type of bending strength(MOR) is weibull distribution for all grade. In case of MOE, normal distribution is best-fit.
Properties of Clay-Woodceramics from 3 layers-clay-woodparticleboard
Lee, Hwa-Hyoung ; Kim, Gwan-Eui ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 80~88
This research was carried out to examine physical and mechanical properties of clay-woodceramics which were carbonized for 3 hours in a special furnace from 3 layers-clay-woodparticleboard made from pallet waste wood, phenol formaldehyde resin(hereafter PF, Non volatile content 52%, resin content 30%) and clay(10%, 20% and 30%). Carbonization temperature was 400
. The results are summarized as follows: 1.The higher the carbonization temperature, the higher the dimensional shrinkage and the lower the carbonization yield ratio. But the higher the clay addition, the lower the dimensional shrinkage and the higher carbonization yield ratio. 2.The higher the carbonization temperature, the higher the water absorption and the density. The higher the clay content, the higher the density. 3.The higher the carbonization temperature, the higher the bending Modulus of Rupture and bending Modulus of Elasticity.
Alkaloids from fruits of Piper nigrum
Park, Il-Kwon ; Lee, Hak-Ju ; Lee, Sang-Gil ; Shin, Sang-Chul ; Park, Ji-Doo ; Choi, Don-Ha ; Ahn, Young-Joon ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 88~95
Five amide alkaloids were isolated from the fruits of Piper nigrum. The structures were determined as : pellitorin (I), quineensine (II), pipercide (III), retrofractamide A (IV), and piperine (V) respectively on the basis of spectrosopic data.
Tensile Properties of Metal Plate Connector in Domestic Softwood Lumber
Shim, Kug-Bo ; Park, Jung-Hwan ; Lee, June-Ho ;
Journal of the Korean Wood Science and Technology, volume 31, issue 5, 2003, Pages 96~103
This study was conducted to evaluate the tensile properties of metal plate connector for the domestic major softwoods, such as Korean red pine, Korean white pine, and Japanese larch. The maximum tensile load of Korean red pine was 3,612kgf in AA type, it was 1.2 and 1.7 times higher load than that of Japanese larch and Korean white pine. In EA type, it was 2,704kgf, and 1.1 and 1.5 times higher than the loads of Japanese larch and Korean white pine. The failure modes of metal plate connector were metal plate withdrawal, plate tensile failure, and wood shear block failure. The failure mode of Korean red pine connector was tensile failure of plate, that is reason of the high tensile load resistance for metal plate connections in Korean red pine. The mechanical properties of metal plate connector could be predicted by the Foschi model parameter. In the initial stage, the Korean red pine connector was stiffer than the other species. The design values for metal plate connector per tooth was 25, 22, and 15kgf for Korean red pine, Japanese larch, and Korean white pine in AA type and 19, 17, and 13kgf in EA type.