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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.
정우양,이용직,이상재 강원대학교 농업생명과학연구원 2023 강원 농업생명환경연구 Vol.35 No.4
In this study, the hot spring water of the Neungam Carbonate Hot Springs in Korea was used to isolate Bacillus strains using marine agar as the medium, and three strains were isolated through single colony isolation. The growth pH and temperature of the isolated strains and their growth potential in complex media were analyzed. Based on strain identification, three strains were confirmed to be members of the Bacillaceae family, but from different genera, and included Bacillus tequilensis, Cytobacillus oceanisediminis, and Caldibacillus hisashii. In addition, cultured media were tested for the ability of the strains to produce extracellular hydrolysis enzymes to determine whether the strains could be used in the cosmetics or food industry, and two strains were confirmed to exhibit extracellular protease activity. Finally, to optimize the medium composition for mass cultivation of the M510 strain, the ability to use various carbon sources was analyzed and 20 types of carbon sources that could be used for carbohydrate metabolism were confirmed. The results of this study can be used as basic research data to secure domestic genetic resources and optimize media for isolated strains.
정우양 한국목재공학회 1996 목재공학 Vol.24 No.2
Handling the manufacured goods is the most cost-consuming task in material handling system in wooden furniture industries. Fully automated warehouse for cartoned goods of a furniture manufacturing company was analized to provide plant engineers and managers with some important informations on the utility and profitability of the automated storage and retrieval system(AS/RS). Process-oriented simulation modeling tech-piques were used to describe the system and to propose some alternatives to promote the efficiency of AS/RS. Simulation report could be inter-preted as follows : 1. Warehouse for the furniture goods must be designed in accordance with reliable material handling program and constructed with suitable equipments depending on the specification of packed products. 2. An excess of palletized products induced the indigestion and the inefficiency of AS/RS of the furniture industry and put this high-costly system into the shade. 3. Overcrowded AS/RS of the furniture factories could regain its material handling function by cutting down the deposit of products into the automated warehouse. For this purpose, reducing the regular output and direct delivering the outside products to the destination should be considered as the definite counterplan. And additional operation of conventional handy warehouse was also expected to improve the efficiency of main AS/RS.
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.
정우양,이필우 한국목재공학회 1984 목재공학 Vol.12 No.2
This study was carried out to examine the practicality of DAP[(NH₄)₂HPO₄) as fire retardant for plywood by static bending test the redried plywoods which had been soaked in 20% (NH₄)₂HPO₄ solution. Being hot/cold soaked in the solution for 3/3, 6/3, 9/3 and 12/3 hours and redried by cyclic press-drying method at the platen temp of 130, 145, 160 and 175℃, the treated plywoods were tested to offer the mechanical data, that is, S_pl(stress at proportional limit), MOE(modulus of elasticity), MOR(modulus of rupture) and W_pl(work per unit volume to proportional limit) in flexure. The results obtained were summarized as follows. 1. S_pl of fire retardant treated plywoods ($quot;FRP$quot; would be used hereinafter) decreased as the platen temperature increased, but it was superior to that of non-treated plywoods(Control) at 160℃ or higher. 2. MOE of FRP decreased roughly with the increase of temperature, but this tendency was not constant. And the value of FRP was higher than that of Control even at 175℃. 3. MOR of FRP showed same temperature-dependent tendency as MOE, but it was influenced more sensitively at the higher temperature. 4. W_pl, of FRP also decreased gradually with the increase of platen temperature and the value in DAP 9/3 treatment was less than 70% of control plywoods. 5. In view of redrying time and mechanical properties, the most reasonable platen temperature for DAP treated FRP was 160℃ in this study.