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Properties of Cellulose Acetate and Polyethylene Composite Film
Hwang, Kweon-Hwan,Lee, Won-Hee,Lim, Bu-Kug Korea Furniture Society 2007 한국가구학회지 Vol.18 No.4
Environmentally-friendly polymer composite films were manufactured from cellulose acetate (CA) and polyethylene (PE). To investigate the optimum manufacturing conditions for the composite, various tests such as thermal analysis, surface observation, IR spectra analysis, and elongation ratio of polymer composite films were carried out. The mixing ratio of each element and manufacture condition was found to be very important for the best goods.
Dimensional Stability of Plastic Processing Wood Material - Compression Wood and Bentwood -
Hwang, Kweon-Hwan,Lee, Won-Hee Korea Furniture Society 2007 한국가구학회지 Vol.18 No.2
This study was carried out to assess the dimensional stability of wood material treated by plastic processing for bentwood and compression wood. The evaluation method was different between two wood materials, but the treatments for them were very similar to each other. One of the main methods is heat treatment with sufficient water vapor. In bentwood, the used species were painted maple (Acer mono), bitter wood (Picrasma quassioides) and birch (Betula schmidtii). Steaming was the worst treatment method for dimensional stabilization of bentwood. The best results could be attained with PEG treatment for dimensional stabilization of bentwood. Dimensional stability of bitter wood was found to be conspicuous. However the steaming treatment at lower temperatures, i.e., about $130^{\circ}C$ was not suitable for dimensional stability of bentwood. In compression wood, the used specimen was Italian poplar wood (Populus euramericana). Two heat compressive pressing conditions, an open-press system and an air-tighten closed-press system, were used. The recovery rate was measured after boiling and/or absorbing in water to estimate the dimensional stability of heat compressed wood. The best dimensional stability of compressed wood in the air-tighten closed-press system was found to be better at $200^{\circ}C$ than $180^{\circ}C$. The best compression rate for dimensional stability was 73 percent.
황권환 ( Kweon Hwan Hwang ),박병수 ( Byeong Su Park ),박문재 ( Moon Jae Park ) 한국목재공학회 2008 목재공학 Vol.36 No.1
It is necessary to assess wood quality and strength of the clear specimens from used members in old wooden structures for the reuse of old members on the same structure or a new structure .Wood species classification by microscope observation of each wood member that was used in truss cord and temple, and several physical and strength tests by the specification of present KS standards were conducted to compare with some references. From the comparison of strengths with references, Korean larch gives relatively better wood quality and mechanical properties than other wood species. No significant deterioration of cell wall was found by microscopic observation for the sound wood part that was selected visually. Tensile specimens with 3 mm in thickness on the middle span showed greater strength than 5 mm thick specimens, which explains that dimension of tensile specimen should be examined for evaluating precise tensile strength properties. Other tests, compression, shear, and bending, are adoptable for each strength properties. Test methods for the evaluation of basic strengths and fastener connections for old wood species should be further examined.
전통공법을 응용한 기계 프리컷 기둥-보 목구조 벽체의 수평전단성능
황권환(Hwang Kweon-Hwan),박주생(Park Joo-Saeng),박문재(Park Moon-Jae) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
For the effective utilization of domestic second-grown wood resources as structural members, post and beam construction with traditional wood system using japanese larch glulam was applied with machine pre-cut processing. Horizontal shear test was conducted to evaluate the horizontal shear performance of the post and beam wood wall. The frame consisted of post and beam with appropriate fasteners and members have their own parts with notch and hole, etc. to connect members. The shear wall consisted of the frame sheathed with screw-nailed Oriented Strand Board(OSB). From horizontal shear tests without vertical loads on the frame and the shear wall specimens, about 1.9kN/m and about 9.7kN/m for the maximum strength and about 167kN/㎜ and 8198kN/㎜ for the shear rigidity, respectively, were obtained. Nail failures were remarkable in the shear wall specimen with punching shears and shear failures. The shear load factor for the shear wall specimen regulated by Architectural Institute of Japan(AIJ) was 1.5, which was obtained by the bi-linear method. For the better shear performance of the structures, column base and post and beam connections and sheathed panel should be further examined.