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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
Expression Patterns of Odorant-Binding Proteins (OBPs) in a Termite (Reticulitermes speratus)
Ra, Jong-Bum ; Kim, Jae-Kyung ; Kim, Gyu-Hyeok ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 1~6
This research was performed to investigate the expression patterns of odorant-binding proteins (OBPs) migrating hydrophobic semiochemicals such as pheromone to the olfactory receptors in a termite (Reticulitermes speratus). Antennas and legs were cut from soldier and worker termites, respectively, and RT-PCR were conducted to investigate the existence of the OBPs reported up to now. Blast search suggested that the OBPs obtained were highly homologues of the OBPs reported. In worker termites, OBP-1 was expressed in both antennas and legs, OBP-2 and OBP-3 were observed only in antennas. And in soldier termites, OBP-1 was shown in both antennas and legs, OBP-2 were not observed, and OBP-3 was found in both antennas and legs. The differences of expression patterns of OBPs between worker and soldier termites may be explained by their specialized peculiarity.
Strength Property of Double Shear Bolted-Connections of Larch
Park, Chun-Young ; Kim, Kwang-Mo ; Lee, Jun-Jae ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 7~16
This study was carried out to evaluate the structural property of double shear bolted connections in Korean Larch. For the main member, sawn lumber and Glulam were used in which thickness of lumber is 39 mm, 89 mm, 139 mm, 189 mm and Glulam 80 mm, 140 mm, 170 mm. For the side member, sawn lumber and steel plate were used in which thickness of lumber is the same of the main member and steel plate is 6mm. And connections were jointed by M12, M16, M20 bolts which were usually used for wood constructions in Korea. Directions of loading to connections were perpendicular and parallel to grain of main and side member. First, through the dowel bearing test, the dowel bearing strength was evaluated and through the bolt bending tests, the bolt bending strength was evaluated. And then experiments for the connection were performed. Obtained results from experiments were compared with calculated values by EYM and analyzed. Strength of double shear bolted connections in Korean Larch was similar or higher than calculated value by EYM. Especially when the side member was made by the sawn lumber, it was similar to the calculated value. In failure mode, the mode was effected by the knot and the dry defect. In the thin main member, it was shown mode I and as the thickness of the main member was thicker, it was changed into mode III.
Far Infra Red Emissivity of Five Korean Wood Species
Lee, Hwa-Hyoung ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 17~20
This research was carried out to examine the FIR (far-infrared rays) emissivity and emission power of five Korean wood species for proving wood as an amenity material. Wood turned out excellent as FIR material with 90-91% emissivity in the range of 5-20
. No difference was identified in the FIR emissivity and emission power between hardwood and softwood, diffuse porous wood and ring porous wood, and high-density wood and low-density wood respectively.
Studies on Variability of Wood Properties within Stem of Larix kaemferi (II) - Difference in Tracheid Length and Width, Microfibril Angle, and Strength in South and North Sides of Stem -
Rlee, So-Mi ; Kim, Byung-Ro ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 21~28
Tracheid length and width, microfibril angle, compressive, bending, and impact strengths between the south and north sides of stem pith in Larix kaemferi were measured. Sample trees were 30 years old which had planted in the central region of Korea. In general, there were no difference in the tracheid length and width, microfibril angle, and strengths between the two sides. And no difference in tangential shrinkage and strengths between the two sides was thought to be due to identical microfibril angle between the two sides.
Evaluation of the Impact on Manufacturing Temperature and Time in the Production Process of Bio-composites
Park, Sang-Yong ; Han, Gyu-Seong ; Kim, Hee-Soo ; Yang, Han-Seung ; Kim, Hyun-Joong ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 29~37
The main objective of this research was conducted to evaluate the impacts on the thermoplastic polymer which is a matrix polymer and the rice husk flour (RHF) which is a reinforcing filler relative to the manufacturing temperature and time when bio-composites were manufactured. In order to evaluate the impacts on the rice husk flour relative to the manufacturing temperature, the rice husk flour was persevered for 10 minutes to 2 hours period at 220
temperature which was then added with the polypropylene (PP) and low-density polyethylene (LDPE) to complete the manufacturing process of the bio-composites and measure the corresponding mechanical properties. As preserving time increased at 220
, the tensile and impact strength were decreased due to the thermal degradation of the main components within the rice husk flour. The thermogravimetric analysis (TGA) was used to measure weight loss caused by the actual manufacturing temperature and the result was that the thermoplastic polymer had not scarcely occurred weight change, but there had been increasing rate of weight loss relative to time for the rice husk flour and the bio-composites under the consistent temperature of 220
for 2 hour time period. Therefore, the proper manufacturing temperature and time settings are significantly important features in order to prevent the reduction of mechanical properties which were induced throughout the manufacturing process under the high manufacturing temperature.
Anatomical Comparison of Compression, Opposite, and Lateral Woods in a Branch of Pinus parviflora S. et Z.
Xu, Guang-Zhu ; Eom, Young-Geun ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 38~47
Compression, lateral, and opposite woods in a branch of Pinus parviflora S. et Z. were described and compared in the qualitative anatomical aspects through light and scanning electron microscopy. Tracheid transition from earlywood to latewood in the compression wood appeared to be relatively more gradual than in the opposite or lateral wood. Growth ring width and proportion of latewood were thought to be greater in the compression wood than in the lateral or opposite wood. The latewood tracheids of compression wood in transverse surface were mostly round, differently from those of lateral and opposite woods with square to angular shapes. Also, intercellular spaces, helical cavities and checks, and slit-like pit apertures were observed only in the compression wood tracheids. Cross-field pitting in the compression wood appeared not to be used as diagnostic guide because of their severe alteration from normal fenestriform or window-like type to cupressoid to taxodioid types. In tangential surface, fusiform rays in the compression wood were wider but lower than those in the lateral wood or opposite wood. In conclusion, compression wood was different from lateral and opposite woods but lateral and opposite woods were almost identical in qualitative anatomical features.
Biodegradation of Phthalic acid by White rot Fungus, Polyporus brumalis
Lee, Soo-Min ; Park, Ki-Ryung ; Lee, Sung-Suk ; Kim, Myung-Kil ; Choi, In-Gyu ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 48~57
Phthalate esters are known as plasticizers and some of them suspected as endocrine disrupting chemicals. In this study, in order to identify the mechanism of phthalate esters degradation by white rot fungus, phthalic acid, which is major metabolite in the biodegradation of phthalate esters, was used. Phthalic acid 50 ppm was treated in culture medium with Polyporus brumalis. The availability of ABTS oxidation was different from control and phthalic acid treated group after 4 days of incubation. The activity was gradually increased in control group, but not in phthalic acid treated group. Especially, esterase activity of control group was maximized at 10 days of incubation, and then decreased while the activity of phthalic acid treated group was increased. Glucose was used as a carbon source, and the difference of glucose consumption by control and phthalic acid treated group was not significant. However, after 6 days of incubation the residual glucose in culture medium was rapidly decreased. The consumption rate of phthalic acid treated group was lower than control. These results might indicate that the absorption of phthalic acid in culture medium was occurred by mycelium and metabolized through some pathways as that of glucose was. To clearify the chemical modification of phthalic acid in culture medium, phthalic acid was reacted under in vitro condition which mycelium was excluded. The metabolites were analyzed by GC/MS. The results showed that phthalic acid was converted to phthalic acid anhydride by the extracellular enzymes of P. brumalis.
The Content and Seasonal Changes of Betulinic acid from Platanus Species
Kim, Ki-Hun ; Kim, Young-Kyoon ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 58~62
In order to find out whether BA can be obtained significantly in large scale or not, the research has been conducted. Platanus species is one of the most widely spreaded shade-tree on the road side in Korea. To examine BA content in the species, samples were collected from various locations in Seoul and Kyunggi Province at each season. The MeOH extracts were obtained from the air-dried and ground samples. BA fraction was obtained by partitioned with chloroform and water then the BA content was measured in HPLC. Consequently, it has been revealed that most of the Platanus species showed to have significant amount of BA all over the examined area and the best season is at the end of November to collect the tree branches for BA.
Sociological Approach of Wood Culture
Hur, Gyong-Tae ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 63~76
Wood-culture is new paradigm which is substituted for the cement culture, and the study of wood-culture should keep pace with not only the study of a engineering science but also a sociological study to form a theory system. The purpose of this study is to suggest the method of sociological approach of the wood culture which have not yet tried at home and abroad; in view of structural-functionalism, systemical-functionalism, conflict theory, social-change theory by analyzing cases in Korea. In view of structural-functionalism, social system consists of cognition system, institution system, life system and technology system. These sub-systems fulfill the function of what-should-be, reasonability, reality and development. In view of systemical-functionalism, according to the acknowledgment and spreading proccess of the wood usefulness, wood culture system consists of the individual system, organizational system and the social system. In view of conflict theory, the society which has the wood culture can be classified into three types. The one is society which the traditional wood culture is declining and the cement culture is spreading. The other one is society which the cement culture is declining and the traditional wood culture is spreading. Another is Finally the society which the two type balance with. In view of social-change theory, the society can be classified into three types. The one is society which the wood culture is proceeding to the cement culture. The other is society which the cement culture is proceeding to the wood culture. Another is society which the wood culture changes itself. Finally, from a view of changing level, the society can be classified into three types: the micro-change, the middle-level-change, and the macro-change. It's need to study wood culture systemically in view of engineering and sociological science. And then it will be possible to make 'wood culture theory system'.
Analysis of Chemical and Physical Characteristics of Log Woods for Oak Mushroom Production Depending on Cultivation Periods and Steam Explosion Treatment
Koo, Bon-Wook ; Park, Jun-Yeong ; Lee, Soo-Min ; Choi, Don-Ha ; Choi, In-Gyu ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 77~86
In order to investigate the ability of log wood for oak mushroom production as a source of an alternative energy, both chemical and physical characteristics of log wood were investigated according to the cultivation periods. Also, both chemical and physical characteristics of material that treated by steam explosion were investigated to confirm the pretreatment effect by remaining enzyme as a control. The contents of ash, water-, alkali- and organic soluble extracts have been increased after the inoculation. It appeard that holocellulose contents substantially decreased and the contents of lignin as another main component of wood remained constant after the inoculation. However this result implied that indeed, a sufficient amount of lignin has been degraded paritially by enzymes of oak mushroom Lentinus edodes if we consider that the amount of holocelulose was substantially reduced. It also indicated that the degree of degradation gradually progressed but crystallinity decreased after the inoculation. The contents of water-, alkali- and organic soluble extracts have been increased by steam explosion. Holocellulose contents increased within narrow limits and lignin contents remained constant. However the contents of holocellulose and lignin have been decreased by steam explosion, considering that the amount of other extractives was relatively increased. The degree of crystallinity and lignin contents reduction by steam explosion was almost similar to the result obtained by increasing cultivation periods. According to the results, log woods for mushroom production have a potential as material for developing alternative energy.
Evaluation of Shear Bond Strength and Adhesive Bond Durability of Mixed Species Structural Glued Laminated Timber
Shim, Sang-Ro ; Yeo, Hwan-Myeong ; Shim, Kug-Bo ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 87~96
This study was carried out to evaluate the shear bond strength and adhesive bond durability of structural glued laminated timber (glulam) manufactured with mixed species lumber of Korean red pine, Korean pine and Japanese larch, using resorcinol adhesive and water-based polymeric-isocyanate adhesive (WPI).Each board used as a glulam lamina was graded by visual inspection. The visual lumber grade of the all species was very low due to the large size and number of knots and the steep slope of grain. In view of the results, appropriate pruning, sawing and drying processes might be needed to produce high grade lamina lumber with small knot size and drying defect free. Shear bond strength of every tested glulam specimen ranged between 7.9 and
, and much higher than the Korean Standard (KS) for glulam shear bond strength,
. There was not much shear bond strength difference between wood/resorcinol and wood/WPI. The resorcinol adhesive bond durability exceeded KS requirements. However, delamination on the end-grain surfaces of WPI glulam submerged in both room temperature and boiling water severely occurred, and its durability did not meet KS requirements. Further investigations may be required, and special care should be taken, to ensure long service life of WPI glulam used for exterior application. Results of this study are expected to be useful for improvement of mechanical properties and structural performance of mixed species glulam.
Biomass Energy in the USA: A Literature Review (II) - Marketing and Policies for Green Power Production with Environmental Attributes -
Kim, Yeong-Suk ; Gorman, Thomas ;
Journal of the Korean Wood Science and Technology, volume 33, issue 1, 2005, Pages 97~110
This paper is the second part of a literature review describing the current status of biomass energy use in the USA. The bioenergy technologies that convert biomass resources to a form of energy were presented, in particular focused on existing coal fired boiler, high efficiency gasification combined cycle. We presented latest biomass power energy supply, economic issues such as its production and plant investment cost in the Part I. In the Part II, our review summarized policy and market issues for electricity consumers, benefits from biomass power which could offer an alternative to conventional energy sources in the form of environmental, rural economic growth, and national energy security in the USA.