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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 32, Issue 6 - 00 2004
Volume 32, Issue 5 - 00 2004
Volume 32, Issue 4 - 00 2004
Volume 32, Issue 3 - 00 2004
Volume 32, Issue 2 - 00 2004
Volume 32, Issue 1 - 00 2004
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Mechanical Properties of Fire-Retardant Treated Wood
Lee, Hyun-Mi ; Kim, Jong-Man ; Byeon, Hee-Seop ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 1~11
This study explored how simultaneous treatment of monoammonium phosphate (MAP) and boric acid for Pinus densiflora and Populus euramericana influenced the properties such as fire resistance, preservation against Trametes versicolor and Tyromyces palustris, and compressive strength of the treated woexls. For specific gravity and compressive strength, the treated woods were higher than the non-treated ones. For the analytical features observed by SEM, the cell walls of the non-treated woods were extremely destructed hy T. palustris and T. versicolor while the treated ones relatively remained intact. Especially, P euramericana was more readily exposed to the attack of the rot fungi than P. densiflora.
Optimization of Submerged Culture Conditions for Protease Production and Its Enzymatic Properties
Cho, Hee-Yeon ; Cho, Nam-Seok ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 12~19
This study was performed to investigate the optimum condition of protease production from submerged culture of oak mushroom (Lentinula edodes, Sanlim No. 5) and its enzymatic features. Among several combinations of media, the combination of wheat bran, corn flour, water and corn oil (WB+CF+W+ CO) yielded 84.8 U/g of maximum protease activity. This combination of ingredients, in spite of not being particularly protein-rich in comparison to the other media, allowed for good growth of the fungus and maximal protease production. Comparison of different growth medium liquids indicated that demineralized water afforded the best growth of the fungus and the highest protease activity. Acetate buffer and acidified water negatively affected The protease production peaked around 72 hr of incubation, and decreased thereafter. The molecular weights of produced protease were about 45,000 by Sephadex G•75 chromatography. The pH optimum for protease activity was 4, while maximal activity incubated at 37
for 1 hr was observed between pH 4-6. The optimum temperature of this protease was 55
, and the enzyme was active over a broad temperature range (30-60
), indicating that this protease would be suitable for a wide range of applications where. different pH and temperature are necessary, such as digestive aids, food industry, beer and tannery industries.
Species Identification of Wooden Relics Excavated in Jedeok Bay, Jinhae
Chong, Song-Ho ; Park, Byung-Su ; Koo, Ja-Oon ; Jung, Eui-Do ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 20~28
26 wooden relics excavated in Jedeok bay, Jinhae, Gyeongsangnam-do, Korea were identified. Wood species identified were consisted of 7 softwoods and 19 hardwoods. Softwoods identified were hard pines (Pinus spp.), while 19 hardwoods were consisted of 15 Lepidobalanus (Quercus spp.), 1Cyclobalanopsis (Quercus spp.), 1 Meliosma oldhami Miq., 1 Platycarya strobilacea S. et Z., and 1Carpinus spp., respectively. The wooden fences were composed of a variety of wood species such as hard pines (Pinus spp.), Lepidobalanus (Quercus spp.), Meliosma oldhami Miq. and Carpinus spp. Wooden members of ship were consisted of Lepidobalanus (Quercus spp.), and parts of ship body were hard pines(Pinus spp.). The other relics that uses were unknown were hard pines (Pinus spp.), Lepidobalanus (Quercus spp,), Cyclobalanopsis (Quercus spp.), and Platycarya strobilacea S. et Z.
Thermal Properties of Corn-Starch Filled Biodegradable Polymer Bio-Composites
Kim, Hee-Soo ; Yang, Han-Seung ; Kim, Hyun-Joong ; Lee, Young-Kyu ; Park, Hee-Jun ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 29~38
In this study, we investigated the thermal properties of corn-starch filled polybutylene succinate-adipate (PBS-AD) bio-composites. Thermal analysis (TA) is used to describe the analytical method for measuring the chemical property and weight loss of composite materials as a function of temperature. The thermal stability of corn-starch was lower than that of pure PBS-AD. As corn-starch loading increased, the thermal stability and degradation temperature of the bio-composites decreased and the ash content increased. It can be seen that the degree of compatibility and interfacial adhesion of the bio-composites decreased because of the increasing mixing ratio of the corn-starch. As the content of corn-starch increased, there was no significant change in the glass transition temperature (
) and the melting temperature (
) for the bio-composites. The storage modulus (E') and loss modulus (E") of the corn-starch flour filled PBS-AD bio-composites were higher than those of PBS-AD, because of the incorporation of corn-starch increased the stiffness of the bio-composites. At higher temperatures, the decreased storage modulus (E') of bio-composites was due to the increased polymer chain mobility of the matrix polymer. From these results, we can expect that corn-starch has potential as a reinforcing filler for bio-composites. Furthermore, we recommend using a coupling agent to improve the interfacial adhesion between corn-starch and biodegradable polymer.
Effect of Neungi (Sarcodon aspratus) Mushroom and Its Protease Addition on the Meat Tenderizing
Cho, Hee-Yeon ; Jeong, Seon-Hwa ; Cho, Nam-Seok ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 39~44
This study was carried out to investigate the tenderizing effect of Neungi mushroom (Sarcodon aspratus) powder and its protease. The addition of Neungi mushroom powder and its protease enhanced water retention values (WRY) of meat. The WRY of meat was increased 26.8% by protease addition, compared to 13.8% WRV by sugar addition. This increase in WRY derived to the increase of water soluble fraction in the meat texture by hydrolysis of meat protein, and had the meat tenderized. Concerned to the meat tenderizing effect, the addition of Neungi mushroom powder and its protease have decreased of meat hardness and gave similar tenderizing effect, as compared to commercial tenderizer, papain. The decreasing rates of meat hardness were 51.6% of Neungi mushroom powder, 58.5% of its protease, and 563% of commercial tenderizer, papain. This tenderizing effect of protease attributed to the degradation of muscle fiber protein in meat, such as actin, myosin and connectin ete. The addition of Neungi mushroom to foods gives significant changes in food calor, mainly decreasing lightness.
Study on Soft Conversion from ASD to RBD Code in Larch
Park, Chun-Young ; Kim, Ho-Ki ; Lee, Jun-Jae ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 45~50
Currently, structural design of wood structure has been based on ASD (Allowable Structural Design) in Korea. However, the results from this method was known as greater than real value because variations of materials and various conditions were not considered sufficiently. So the study about the design method with probabilistic approach is being performed to overcome this problem. And the standard design method of RBD (Reliability Based Design) has been established and applied. In this study, to apply this method on the domestic wood, the distribution property of the lumber and Glulam was analyzed from the previous report and the basis of the standardized design method was established as soft conversion method from allowable stress used in ASD into reference resistance used in RBD. And through the additional study about the sample size as a important factor to effect on soft conversion, condition to be required in more accurate conversion was evaluated.
Glycoprotein in the Fruit Body of Sarcodon aspratus
Cho, Nam-Seok ; Choi, Tae-Ho ; Cho, Hee-Yeon ; Leonowicz, Andrzej ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 51~58
This study was performed to investigate compositions of inorganic elements, amino acids and glycoprotein fractions as biological substances in fruit body of Sarcodon aspratus. The fruit body of Sarcodon aspratus contained Ca, Mg, Zn, Mn, Fe, Cu, and Pb, in particular high Ca and Na. Hot water extracts consisted of 54% of polysaccharide fraction and 32.6% of protein. In amino acids composition, fourteen free amino acids were detected, mainly glutamic acid, alanine and arginine. Fifteen kinds of total amino acids were contained with major components of glutamic acid, aspartic acid, serine and threonine. Concerned to glycoprotein extraction, 95% ethyl alcohol concentration gave the highest yields with 70.6% sugar fraction, 332% glycoprotein. Different ethyl alcohol concentration resulted in different protein precipitations, and lower concentration ethyl alcohol in the range of 30 to 70% gave more than 92% of higher sugar fraction. Crude glycoprotein (GP) was fractionated by P fraction of more than MW 300,000, P-1 fraction unadsorbed by DEAE-Sephadex, P-2 fractionated from P-1 by Sepharose 2B gel chromatography and P-3 fraction adsorbed by DEAE-Sephadex. Total sugars were increased and protein contents decreased during fractionation. GP and P-3 contained glucose, galactose, mannose and fucose. GP had high glucose with high contents of glutamic acid, serine, alanine and glycine. P-3 fraction contained high mannose with aspartic acid, glutamic acid, and glycine. P-2 fraction was 700,000 MW with high glucose and fucose, and low protein of 1.1%, high amounts of aspartic acid, glutamic acid and alanine, but no mannose and no cysteine.
The Adhesion Property of Fish Glue
Lee, Young-Kyu ; Hwang, Hyeon-Deuk ; Kim, Hyun-Joong ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 59~65
The present study aims to optimise the process parameters of fish glue and adhesion property through room temperature in terms of curing time and opened assembly time for attaining best adhesion strength to wood (Yellow birch, B. alleghaniensis). The uncured and cured fish glue have been characterised by TGA, DSC, FT-JR. It is observed that with increasing curing time up to 48 H, tensile lap shear strength of adhesive joint of fish glue to wood increases and decreases after 48 H. At 15 min. opened assembly time, lap shear strength increases up to 4833
and decreases after 15 min.
Study on the Reliability Analysis of Wood Floor System Exposed to Fire
Kim, Gwang-Chul ; Lee, Jun-Jae ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 66~74
Fire performance is the important criterion for evaluating of safety of wood structures which exposed to the standard fire condition. Endurance time and time-to-failure are used as the criteria for fire performance in many countries. Reliability analysis about wood floor system which exposed to fire was carried out as preliminary research for reliability-based design on fire. Analyses were conducted by two methods, numerical analysis method and deterministic method.. They didn't show the difference between two methods. The reliability of floor exposed to fire showed strong dependence on the coefficient of variation of member and did not be influenced by the strength or load of member.
Application of Natural Dyes for Developing Colored Wood Furniture (I) - Color Variation by Extraction Methods of Natural Dyes -
Moon, Sun-Ok ; Kim, Chul-Hwan ; Kim, Jae-Ok ; Kim, Jong-Gab ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 75~85
The natural dyes from Gardenia jasminoides, Carthamus tinctorius L., Rhus javanica, Lithospermum erythrorhizon, Caesalpinia sappan L., and Castanea crenata were extracted under different pH in distilled water, As the pH in distilled water went from acid to alkali, the much deeper colors in the same color tone were generated from the individual plant species. Before dyeing, wood species were treated by different mordants including AI, Cu, Cr and Fe for color-fixing between wood and the natural dyes. Each mordant cauld develop independent color on the surface of the woods. The wood species dyed by the natural dyes created deep-tone colors according to higher pH and temperature of the dyeing solution, leading to deeper penetration of the dyes into the wood tissues. Finally through the computer modelling of natural-dyed wood furniture, it was confirmed that the colored furniture can adequately be compatible with the current interior spaces of diverse colors.
Effect of Overlaid White Charcoal Board on the Ethylene Gas Adsorption and Preservation Life of Strawberry
Lee, Hwa-Hyoung ; Cho, Youn-Mean ; Park, Han-Sang ;
Journal of the Korean Wood Science and Technology, volume 32, issue 5, 2004, Pages 86~92
This research was carried out to examine the ethylene gas adsorption and preservation life of white charcoal boards for packaging. Two types of white charcoal board were made of #40-60 charcoal particles and mixed charcoal particles with PVA and MDI resin by wet process. For not only beauty effect but also avoiding stain from touching, white charcoal boards were overlaid with two kinds of overlay material, thin printed paper and non woven fabric. A charcoal board adsorbed ethylene gas much more than the paper and even white charcoal itself. There was no difference between two board types, between overlay treatments, and between overlay materials. Gray mold growth of strawberry arised after 2 days in a paper box and after 4 days in a white charcoal board. Preservation life of white charcoal board box was approximately twice more than that. of a paper box. There was no difference in the ability of keeping freshness between two board types, between overlay treatments, and between overlay materials.