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정우양,김종만,이필우 한국목재공학회 1984 목재공학 Vol.12 No.4
Soaking treated in 20% aqueous solutions of (NH₄)₂SO₄,(NH₄)H₂PO₄, (NH₄)₂HPO₄, Na₂B₄O_7-H₃BO₃(60:40) and Minalith, the mixed salts for 9 hrs, the wet 3.5mm meranti(Parashorea spp.) plywood, were press-dried at 90, 120 and 150℃ and put to static bending test to examine the influence of redrying temperature on the strength of fire-retardant treated plywoods in flexure. White water-soaking treatment (control) showed serious reduction in Stress at proportional limit, MOE, MOR, Work per unit volume at 150℃, all the fire-retardant treatments maintained bending strength even at 150℃ and showed rather increased values in case of some chemicals. In view of drying rate and maintenance of strength, the most pertinent platen temperature was 150℃ and Borax-Boric acid was the predominant fire-retardant In this study.
건식 열처리에 의한 죽재의 변색 특성 및 日光堅牢度 비교 연구
정우양 한국가구학회 2021 한국가구학회지 Vol.32 No.4
The eco-material, bamboo is famous for its sustainable growth and high carbon reserving capacity which has been used for various crafts and hygienic tools. This study was carried out to analyze the safe coloration and lasting possibility of three domestic bamboo species, i.e. Wangdae (P. bambusoides), Maengjonjuk (P. pubescens), Somdae (P. nigra var. henonsis). Intrinsic color characteristics of dried culm of Wangdae is the most light (highest L-value) and Somdae showed the highest b-value (high chroma, yellowness). Three bamboos revealed common response to heat treatment showing more distinct L-value change than those of a-value and b-value comparatively. So the lightness was chosen as the index of heat reaction in this study. The decrease of L-value of Wangdae due to heat was noticeable from 140°C and showed drastic darkening at 200°C for 30min. Maenjonjuk reacted slowly showing the darkening in 30min treatment, while Somdae showed quick response in short treatment (15 min) at each temperature. Therefore the author concluded that Wangdae and Somdae were suitable for short heat treatment in bamboo coloration and high temperature (200°C) was recommendable for high level darkening regardless bamboo species. Light fastness of heat treated bamboo culm were strengthened with increase the temperature and duration of heat treatment with three bamboos commomly. Consequently, author got the important information on the coloration and fastness for the utilization of domestic bamboo species.
유럽산 바이올린 용재의 비중과 년륜폭이 소재의 음향적 성질에 미치는 영향
정우양,홍병화 한국가구학회 1999 한국가구학회지 Vol.10 No.1
This study was carried out to analyze the relationship between basic physical properties and acoustical characteristics of imported violin wood and to offer the information on raw material procurement and incoming-material quality control to domestic violin makers which have purchased most raw materials from European exporting countries at high expense. Equilibrium moisture content of European spruce with lower specific gravity after the prolonged storage was rather higher than that of European maple with higher specific gravity. The specific gravity of spruce increased with decreasing annual ring width, however, that of narrower annual ring. Increasement in specific gravity enhanced the dynamic Young's modulus of both wood species, but influenced the vibration energy loss by internal friction differently between two species. For dynamic MOE, qurater-sawn spruce was higher than the flat-sawn, but maple showed the reverse directional characteristics. Consequently, it would be well for violin makers to establish the standard for materials and quality control system to assure the quality of their violin products.
정우양 전남대학교 농업과학기술연구소 2017 농업생명과학연구동향 Vol.55 No.
ABSTRACT 'Climate change' means a change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods. ‘Greenhouse Gas’ is main anthropogenic cause of Global Warming and Climate Change of the Ecosystem, 'The Earth'. International society and UN have focused on the Greenhouse Gases ― CO2, CH4, N2O, HFCs, PFCs, SF6 ―, and made many efforts to mitigate the Climate Change by lowering the greenhouse gas inventory with international cooperation. They started to organize UNEP, WCED to arouse the issue of the development and environment problem, and finally IPCC (Inter-governmental Panel on Climate Change) to support UNFCCC with information and knowledge by expert working group and research activities. IPCC developed and improved some guidelines to evaluate national greenhouse gas inventory since 1995 to get more complete, consistent, comparable, tranparent and accurate greenhouse gas emission and removal calculation results of each country. It paid attention to the effect of 'Harvested Wood Products(HWP)' as the sink of Carbon Dioxide sequestration and developed the approaches and calculation formula for the HWP with carbon conversion factor and half life. Consequently, 2006 IPCC guidelines and 2013 KP supplementary and Good Practice Guidance are the officially accepted two evaluation tools with different HWP sorting accompanied with different conversion factor, half life and tier classification. Comparison of the greenhouse gas inventory data from these evaluating tool would be meaningful to supply measurable, reportable and verifiable greenhouse gas inventory including the effect of HWP for each country during Paris Climate Agreement era.