• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2006.06b
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• pp.257-263
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• 2006

This paper examines the physico-chemical properties and structural features of thio lignin and alcohol lignin preparations extracted from fast-growing poplar wood. The lignin preparations were characterized using UV, IR and alkaline nitrobenzene oxidation methods. The yield was higher in thiolignin due to its preparation from wood under drastic alkaline conditions and almost the total amount of alkaline degraded lignin was precipitated except acid soluble lignin. In case of ethanol lignin, structural modifications were comparatively less and form a cream colored lignin more or less similar to its original natural color. The methoxyl values were higher due to syringyl unit present in hard wood lignin in addition to guaicyl unit present in soft wood. The higher values of methoxyl content of isolated lignin revealed that it was built up of high syringyl units. The elementary analysis, methoxyl group and hydroxyl groups were presented by $C_{9}$ formula indicated that it was made up of phenyl propane monomers. Nitrobenzene oxidation of thio lignin and ethanol lignin yield more or less the chromatograms of similar pattern, except difference in relative percentage. The ultra violet spectra of lignins were quite similar, irrespective of the source and method of isolation. Infrared spectroscopy studies of poplar deltoides, thio and ethanol lignin shown different absorption bands which have been utilized for structural investigations.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.45 no.6
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• pp.72-77
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• 2013

Tissue and paper manufacturing companies have common problems with increasing cost of imported virgin pulp and the restriction of using woods in the forest. Possibility of using bagasse pulp for solving those problems was studied. In order to reduce the production cost and study the dependency on pulps, bagasse pulp has been studied for mixing with Sw-BKP and Hw-BKP. Optimum blending ratio of wood pulps and bagasse pulp to enhance tissue properties were analyzed. Various properties of the hand sheet after blending of wood pulp and bagasse pulp were measured. As results, the bagasse pulp could substitute the hard wood pulp with similar properties of tissue. Therefore, we judged that the bagasse pulp was suitable for replacement of the hardwood pulp.

• Journal of the Korean Wood Science and Technology
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• v.39 no.1
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• pp.33-40
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• 2011

In this study, we identified wood species used in manufacturing Streetcar No. 381 from Seoul Museum of History. This Streetcar No. 381 is an important cultural heritage as one of the 2 streetcars remained in Seoul. It is important to preserve this streetcar through restoration and to maintain without any damage or degradation. The information on species of wood members should be needed for its original restoration. Thus, 6 interior and 1 exterior wood members were sampled and identified microscopically. Among the 7 wood members identified, 2 were found to be douglas-fir ($Pseudotsuga$), 2 lauan ($Shorea$), 1 exotic hard pine of ponderosa group ($Pinus$), 1 larch ($Larix$), and 1 oak of cerris group ($Quercus$), respectively.

• 한국연소학회:학술대회논문집
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• 2006.10a
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• pp.156-159
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• 2006

Gasification and melting method is one of the most potential means for waste treatment process with low emission of fly ash or heavy metal, dioxin and high possibility of using slags as resources. Moisture contents influences directly a gasification characteristics of waste. So it is necessary to investigate the effect of moisture contents in gasification. But it is hard to consider the effect of moisture contents, using samples of powder form of Milligram's order in existing thermogravimetric analyser. Therefore, we made a thermogravimetric analysis device to applicate samples of Gram's order. Gasification characteristics are typically reported with result from thermogravimetric analysis date for wood and RDF samples along with changing moisture contents. It is discussed the way to apply these analysis results to gasification and melting furnace.

• Journal of the Korean Wood Science and Technology
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• v.40 no.5
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• pp.343-351
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• 2012

A large diameter roundwood is an important element of Korean traditional buildings, Hanok, and is hard to be dried without surface cracks. Four different pretreatments, such as pre-cracking, oil heating, kerfing-oil heating and PEG impregnation, were investigated for reducing the surface cracks of large-diameter roundwood specimens during heat treatment. The roundwood specimens of pre-cracking, oil heating and kerfing-oil heating showed surface cracks during pretreatment, but that of PEG impregnation did not. It was confirmed that kerfing reduced the total crack width. Among the four pretreatments and control only the PEG impregnation roundwood specimen had no crack on both outer and inner surfaces after heat treatment. The PEG impregnation specimen shrank only 1.6% in the tangential direction while the pre-cracking did 8.0%.

• Mycobiology
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• v.45 no.1
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• pp.52-56
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• 2017

In this study, we report the manganese peroxidase production ability from a Fusarium sp. strain using an inexpensive medium of agriculture residues of either rice straw or wood chips as carbon source. The highest manganese peroxidase activity on rice straw medium and on wood chips was 1.76 U/mL by day 9 and 1.91 U/mL by day 12, respectively.

• Journal of the Korea Furniture Society
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• v.17 no.2
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• pp.49-56
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• 2006

This research was carried out to examine the FIR (far-infrared rays) emissivity and emission power of five types of flooring board by the mixing ratio of charcoal and loess, and the physical property of five types of injected flooring board by the amount of mixture. Type D was appeared the most high value of FIR emissivity and emission power. But there was a little difference among the five types of flooring board values. In physical properties, control type flooring board and injected flooring board showed a similar tendency. Among the domestic trees, all of hard wood seems to be used to surface wood for strong hardness flooring board. But a coniferous tree was not.

• Journal of the Korean Wood Science and Technology
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• v.39 no.3
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• pp.213-220
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• 2011

The objective of this study is to conduct the species identification and tree-ring dating for the wood elements of Daesungjeon (main hall) in Jipyeong Hyanggyo, a Confucian shrine in Jije-myeon, Yangpyeong-gun, Gyeonggi-do, Korea. Major wood species for Daesung Hall was Pinus densiflora (88%) belonging to hard pine. The other species was P. koraiensis belonging to soft pine. One large beam and one collar beam with bark were dated to A.D. 1718 and 1720, suggesting either a large-scale repair or moving in 1720s as the record of an historical document 'Hakgyodeongrok'.

• Journal of the Korean Wood Science and Technology
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• v.41 no.2
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• pp.164-172
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• 2013

The purpose of this research was development of quantitative ultrasonic test methodology for detecting internal defects in members of ancient wooden building. Connection part between wooden members and/or contacted or hidden part by wall of ceiling or other construction materials make it hard to apply direct way of ultrasonic test. So indirect way of ultrasonic test needed to be applied. Test methodology with newly developed prototype of ultrasonic system was proposed. Homogeneous material with polypropylene was also tested for establishing the criterion. Results showed that TOF(time of flight)-energy and pulse length were found out to be proper ultrasonic parameters for predicting depth of defect in wood different from polypropylene. It was not possible to directly apply prediction equation derived from polypropylene. Newly established prediction equation shows coefficient of determination of 0.73 for wood. Finally, defect of replaced rafter members was predicted with the coefficient of determination of 0.32. Various aspects of ultrasound propagation in wood including anisotropy need to be carefully considered to raise up the prediction accuracy.

• Journal of the Korea Furniture Society
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• v.18 no.1
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• pp.70-83
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• 2007

Rattan furniture is strips of cane around the frame that consists of wisteria, bamboo and wood. The materials are originally from Southeast Asia, and the material of domestic Rattan goods is Korean wisteria. Rattan, which is strong and elastic, is often used for craft materials, and it also retains the original feel of the material with great touch. It is beautiful and suitable for expressing curves. It is shiny, light in weight, easy for cleaning and ventilation. Rattan furniture is unique product made by human hands and nature and is an environment friendly well-being furniture. The use examples of these domestic rattan furnitures is condensed as below. First, the materials of rattan product is wisteria, rice straw, bush clover wood, reed and bamboo. Second, the use of rattan product which is made of domestic wisteria is limited to farming equipments and living wares. Third, the materials of rattan furniture differs in domestic made and foreign made product. As is the characteristics of timbers growing in warmer climates of Korea, it has many twist and strong and it is not straight in length so it is hard to manufacture into and use as furniture also it is hard to acquire right size for the material.