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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 34, Issue 6 - 00 2006
Volume 34, Issue 5 - 00 2006
Volume 34, Issue 4 - 00 2006
Volume 34, Issue 3 - 00 2006
Volume 34, Issue 2 - 00 2006
Volume 34, Issue 1 - 00 2006
Selecting the target year
Evaluation of Specific Gravity in Post Member by Drilling Resistance Test
Park, Chun Young ; Kim, Se Jong ; Lee, Jun Jae ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 1~9
Recycled Polypropylene (PP) - Wood Saw Dust (WSD) Composites: The Effect of Acetylation on Mechanical and Water Absorption Properties
Khalil, H.P.S.A. ; Sharifah Shahnaz, S.B. ; Ratnam , M.M. ; Issam, A.M. ; Ahmad, Faiz ; Nik Fuaad, N.A. ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 10~21
Hygroscopic Properties of Light-Frame Wall with Different Assemblies
Kim, Se Jong ; Park, Chun Young ; Lee, Jun Jae ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 22~29
Study on the Fluidized-Bed Drying Characteristics of Sawdust as a Raw-Material for Wood-Pellet Fuel
Lee, Hyoung Woo ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 30~36
Viscoelastic Properties of MFfPVAc Hybrid Resins as Adhesive for Engineered Flooring by Dynamic Mechanical Thermal Analysis
Kim, Su-min ; Kim, Hyun-Joong ; Yang, Han-Seung ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 37~45
The viscoelastic properties of blends of melamine-formaldehyde (MF) resin and poly(vinyl acetate) (PVAc) for engineered flooring used on the Korean traditional ONDOL house floor heating system were investigated by dynamic mechanical thermal analysis (DMTA). Because MF resin is a thermosetting adhesive, the effect of MF rein was shown across all thermal behaviors. The addition of PVAc reduced the curing temperature. The DMTA thermogram of MF resin showed that the storage modulus (E') increased as the temperature was further increased as a result of the cross-linking induced by the curing reaction of the resin. The storage modulus (E') of MF resin increased both as a function of increasing temperature and with increasing heating rate. From isothermal DMTA results, peak Ttan s values, maximum value of loss modulus (En) and the rigidities (Ll E) of MF/PVAc blends at room temperature as a function of open time, peak Ttm1S and maximum loss modulus (En) values were found to increase with blend MF content. Moreover, the rigidities of the 70:30 and 50:50 MF/PVAc blends were higher than those of the other blends, especially of 100% PVAc or MF. We concluded that blends the MF/PVAc blend ratios correlate during the adhesion process.
Measurement of Dynamic MOE of 3-Ply Laminated Woods by Flexural Vibration and Comparison with Bending Strength and Creep Performances
Park, Han-Min ; Byeon, Hee-Seop ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 46~57
To estimate nondestructively strength performances of laminated woods, 3-ply parallel- and crosslaminated wood specimens exposed under atmosphere conditions after bending creep test were prepared for this study. The effects of density of species, arrangement of laminae and lamination types on dynamic MOE obtained by flexural vibration were investigated, and regression analyses were conducted in order to estimate static bending strength and bending creep performances. Dynamic MOE of parallel-laminated woods showed 1.0~ 1.2 times higher values than static bending MOE, and those of cross-laminated woods showed 1.0 ~ 1.4 times higher values than static bending MOE. The degree of anisotropy of dynamic MOE perpendicular to the grain of face laminae versus that parallel to the grain of face laminae was markedly decreased by cross-laminating. There were strong correlations between dynamic MOE by flexural vibration and static bending MOE (correlation coefficient r = 0.919~ 0.972) or bending MaR (correlation coefficient r = 0.811 ~0.947) of 3-ply laminated woods, and the correlation coefficient were higher in parallel-laminated woods than in cross-laminated woods. It indicated that static bending strength performances were able to be estimated from dynamic MOE by flexural vibration. Also, close correlations between the reciprocal of dynamic MOE by flexural vibration and initial compliance at 0.008 h of 3-ply laminated woods were found (correlation coefficient r = 0.873 ~ 0.991). However, the correlation coefficient between the reciprocal of dynamic MOE and creep compliance at 168 h of 3-ply laminated woods was considerably lower than those between dynamic MOE and initial compliance, and it was hard to estimate creep compliance with a high accuracy from dynamic MOE due to the variation of creep deformation.
Acoustic Property and Hardness of Coatings for MusicalInstruments with Various Coating Thicknesses
Hwang, Hyeon-Deuk ; Lee, Byoung-Ho ; Choi, Jae-Hoon ; Kim, Hyun-Joong ; Chung, Woo-Yang ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 58~67
The relationship between acoustic property and coating hardness of musical instruments was investigated using a sound level meter and a pendulum hardness tester. Urethane topcoat, oil stain, natural oil varnish, and UV-curable epoxy acrylate coatings were applied on four different substrates: Paulownia coreana, Pinus koraiensis, Castanea crenata var. dubs and Pinus densiflora. The influence of the coating type on the acoustic properties was stronger than that of the substrate. In the case of an oil stain formed with tacky coating layer, the sound pressure level (SPL) and surface hardness decreased with increasing of coating thickness. In the other coatings, SPL decreased and hardness increased as the coating layer thickened. However, SPL began to increase again at coating thickness above 100 .um.
Micromorphological and Chemical Characteristics of Cengal (Neobalanocarpus beimii) Heartwood Decayed by Soft Rot Fungi
Kim, Yoon-Soo ; Singh, Adya P. ; Wong, Andrew H.H. ; Eom, Tae-Jin ; Lee, Kwang-Ho ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 68~77
The heartwood of cengal (Neobalanocarpus heimii) is known to have a high degree of decay resistance by virtue of its high extractive content. After 30 years in ground contact an utility pole of this tropical hardwood was found to be degraded only in the surface layers by cavity-forming soft rot fungi. The present work was undertaken I) to characterize the degradation of cengal heartwood from the aspect of ultrastructure and chemistry and 2) to investigate the correlation between soft rot decay and its extractive microdistribution in wood tissues. The chemical analysis of cengal heartwood revealed the presence of a high amount of extractives as well as lignin. The wood contained a relatively high amount of condensed lignin and the guaiacyl units. Microscopic observations revealed that vessels, fibers and parenchyma cells (both ray and axial parenchyma) all contained extractives in their lumina, but in variable amounts. The lumina of fibers and most axial parenchyma were completely or almost completely filled with the extractives. TEM micrographs showed that cell walls were also impregnated with extractives and that pit membranes connecting parenchyma cells were well coated and impregnated with extractives. However, fungal hyphae were present in the extractive masses localized in cell lumina, and indications were that the extractives did not completely inhibit fungal growth. The extent of cell wall degradation varied with tissue types. The fibers appeared to be more susceptible to decay than vessels and parenchyma. Middle lamella was the only cell wall region which remained intact in all cell types which were severely degraded. The microscopic observations suggested a close correlation between extractive microdistribution and the pattern and extent of cell wall degradation. In addition to the toxicity to fungi, the physical constraint of the extractive material present in cengal heartwood cells is likely to have a profound effect on the growth and path of invasion of colonizing fungi, thus conferring protection to wood by restricting fungal entry into cell walls. The presence of relatively high amount of condensed lignin is also likely to be a factor in the resistance of cengal heartwood to soft rot decay.
Phenylpropanoid Glycosides of Paulownia coreana Uyeki Leaves
Si, Chuan-Ling ; Kim, Jin-Kyu ; Kwon, Dong-loa ; Bae, Young-Sao ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 78~82
The leaves of Paulownia coreana Uyeki were collected, extracted with acetone-Her) (7:3, v/v), concentrated under reduced pressure and successively fractionated using n-hexane, methylene chloride, ethyl acetate and water on a separatory funnel. A portion of the ethyl acetate soluble powder was chromatographed on a Sephadex LH-20 column using aqueous methanol and ethanol-hexane as washing solvents. Two isomeric phenylpropanoid glycosides were isolated and elucidated as verbascoside and isoverbascoside by NMR and MS spectrometers.
Apigenin Derivatives of Paulownia coreana Uyeki Leaves
Si, Chuan-Ling ; Kim, Jin-Kyu ; Kwon, Dong-Joo ; Bae, Young-Sao ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 83~87
The leaves of Paulownia coreana Uyeki were extracted with acetone-l-l-O (7:3, v/v), concentrated under reduced pressure and fractionated successively with n-hexane, methylene chloride and ethyl acetate, leaving residual water soluble fraction. A portion of the resulting aqueous soluble powder was chromatographed on a Sephadex LH-20 column using aqueous methanol and ethanol-hexane as washing solvents. Three apigenin derivatives were isolated and identified as apigenin-7-0- P' -D-glucpyranoside, apigenin-7-0- P' -D-glucuronopyranoside and apigenin-7-0-[ P' -D-glucuronopyranosyl( 1---->2)-0- P' -D-glucuronopyranoside] by spectroscopic methods including NMR and FAS-MS.
Study on the Relationship between the Structure and Antioxidant Activities of Chalcones
Park, Young-ki ; Lee, Hak-Ju ; Lee, Wi-Young ; Ahn, Jin-Kwon ; Hwang, Byung-Ho ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 88~94
The purpose of this study is to examine the relationship between antioxidant activities and chemical structures of various chalcones. Twenty-two chalcones were assessed for their radical scavenging activity using the I, I-diphenyl-2-picrylhydrazyl (DPPH) assay. Of 22 compounds tested, the most active on DPPH radical was 2',4-dihydroxy-3,3'5-trimethoxy-5'-propylchacone (4) (72.6% at lOa ppm). It was followed by 3',4'-dihydroxy-3,4,5-trimethoxy-6 '-methylchalcone (6), 2',4,4'-trihydroxy-3-methoxy-5-propenylchalcone (7) and 2',4,4'-trihydroxy-3,5-dimethoxychalcone (13). Based on the results, we concluded that the scavenging activity is controlled by the number and the position of the substitution in the compound.
Studies on Biological Activity of Wood Extractives (XVII) - Components and Antioxidant activity of Alnus firma -
Choi, In-Ho ; Choi, Tae-Ho ; Park, Young-ki ; Lee, Oh-Kyu ; Kwon, Yeong-Han ; Kang, Ha-Young ; Park, Il-Kwon ; Choi, Don-Ha ; Shin, Sang-Chul ; Lee, Hak-Ju ;
Journal of the Korean Wood Science and Technology, volume 34, issue 2, 2006, Pages 95~100
This study is to isolate bio-active compounds from Alnus firma and evaluate their antioxidant activity, Dried wood powder of A, firma was extracted by organic solvents and fractionated in the sequential extraction steps. The isolated compounds were characterized by EI-MS, 13C_ and lH-NMR including COSY, DEFT, HMQC, and HMBC. Antioxidant activities of the isolated compounds were evaluated by DPPH (I, l-diphenyl-2-picrylhydrazyl) free radical scavenging effect. From the wood of A. firma, three kinds of diarylheptanoids, alnusodiol (I), alnusonol (2) and alnusone (3), and gallic acid (4) were isolated. Among these four compounds, compound I, 2, and 3 are isolated from A. firma for the first time. The antioxidant activity of gallic acid was 93.5% at the concentration of 100 ppm. This compound showed stronger antioxidant activity than those of other isolated compounds and the reference BHT (butylated hydroxytoluene).