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李賢鐘,朴喜錫,梁昇柱,尹瑛斌 제주대학교 1987 논문집 Vol.24 No.-
濟州地域에서 販賣되고 있는 國內産 市乳 7個製品을 1986年 3月부터 1987年 2月까지의 매월 2회씩 총 138점에 대하여 組成分을 分析한 結果를 要約하면 다음과 같다. 1. 市乳의 乳脂肪, 乳蛋白質,乳糖,總固形分 및 無脂固形分의 含量은 各各 3.71%, 3.11%, 4.59%, 12.17% 및 8.48%였다. 2. 各 組成分 含量은 季節에 따라 變化하여 대체로 봄과 겨울철이 여름과 가울철에서 보다 높았다. 3. 各 組成分 含量間에는 高度의 正의 相關이 있었다. 4. 各 製品間의 組成分 分析結果는 乳脂肪 含量은 B제품이 3.86%로서 가장 높았고, E제품이 3.55%로써 가장 낮았으며 乳蛋白質은 B제품 및 D제품이 3.17%로 가장 높았고, F제품이 3.02%로 가장 낮았으며 乳糖과 總固形分 및 無脂固形分은 各各 4.57%, 12.44%,8.65%로써 D제품 市乳가 가장 높았고, E제품은 4.34%, 11.83%, 8.28%로써 가장 낮은 수준을 보여 주었다. This study was carried out to find the chemical properties of the market milk produced in Korea. Market milk from 7 dairy companies was analyzed for their gross composition, twice a month from Mar. in 1986 to Feb. in 1987. MULTI-SPEC. M was used to determine fat, protein, lactose, solids-not-fat and total solids in samples collected from retail stories in Che-ju area. The results obtained were summarized as follows; 1. The average contents of fat ,protein, lactose, total solids and solids-not-fat were 3.71, 3.11, 4.59, 12.17% and 8.48%. 2. Average compositions of market milks have shown large a variation with the seasons and was generally higher in spring and winter. 3. There were highly positive correlations among the components. 4. B prouct gave the highest fat content, 3.86% but E product gave the lowest, 3.55% and D product gave the highest protein content, 3.17% but F product gave the lowset, 3.02% and D product gave the highest value of lactose, total solids and solids-not-fat contents (4.57, 12.44 and 8.65) but D product gave the lower 4.34, 11.83 and 8.28%, respectively.
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윤영빈,길태옥,임지혁 한국추진공학회 2007 한국추진공학회지 Vol.11 No.1
The review of the liquid propellant rocket engine presented. The combustion instabilities which are discovered on solid and liquid propellant in 1930, have been occurred on machines using combustion process, which are gas turbine, ramjet, scramjet and rockets, and necessity of combustion instability study became claimed. However, we have not been solved this problem up to now. Therefore, we analyzed causes and mechanisms generated combustion instability and inquired into history of combustion instability control in various countries for the liquid propellant rocket engine. 액체추진제 로켓 엔진에서 발생되는 연소불안정 현상에 대해 논의하였다. 지난 1930년대에 고체 및 액체 로켓에서 발견되었던 연소불안정 현상은 연소현상을 이용하는 가스터빈, 램 및 스크램젯, 로켓 등 모든 기관에서 문제가 대두되었고, 이러한 기관들의 안정적인 운용을 위해서는 연소 불안정성에 대한 연구가 필요하게 되었다. 그러나, 엔진을 파괴하는 심각한 현상을 초래하는 이 현상을 아직까지 완전히 제어하고 있지 못하다. 따라서, 연소불안정 현상이 발생되는 원인과 메커니즘을 알아보고, 액체추진제 로켓에 대한 각국의 개발사를 알아보았다.
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Experimental and Numerical Analysis of Slurry Flow in Chemical Mechanical Polishing
윤영빈,이도형,Mirza Baig 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
A slurry flow field in chemical mechanical polishing (CMP) was analyzed by using particle image velocimetry (PIV) and numerical simulations. PIV experiment for analyzing the CMP hydrodynamic regime is a novel approach and the first to combine both experimental measurements and numerical simulations. The quality of CMP in semiconductor production is characterized by its output properties, such as its removal rate (RR) and nonuniformity (NU). The nonuniformity of the wafer surface is due to the irregularity of the material removal rate across the wafer's surface and both NU and RR problems result from an uneven slurry flow distribution on the wafer surface. The slurry ow field was studied on the wafer scale under various pad and carrier rpm conditions. Direct measurement of the slurry flow field was first applied to the CMP process by adequately modifying a conventional PIV system. A numerical simulation was carried out for the validation of the current analysis and for future use under various CMP conditions. The analysis showed that the flow speed was strongly in fluenced by the pad velocity and that the overall flow field was characterized mainly by the ratio between the pad rpm and the carrier rpm. A slurry flow field in chemical mechanical polishing (CMP) was analyzed by using particle image velocimetry (PIV) and numerical simulations. PIV experiment for analyzing the CMP hydrodynamic regime is a novel approach and the first to combine both experimental measurements and numerical simulations. The quality of CMP in semiconductor production is characterized by its output properties, such as its removal rate (RR) and nonuniformity (NU). The nonuniformity of the wafer surface is due to the irregularity of the material removal rate across the wafer's surface and both NU and RR problems result from an uneven slurry flow distribution on the wafer surface. The slurry ow field was studied on the wafer scale under various pad and carrier rpm conditions. Direct measurement of the slurry flow field was first applied to the CMP process by adequately modifying a conventional PIV system. A numerical simulation was carried out for the validation of the current analysis and for future use under various CMP conditions. The analysis showed that the flow speed was strongly in fluenced by the pad velocity and that the overall flow field was characterized mainly by the ratio between the pad rpm and the carrier rpm.
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윤영빈,정원철,최언호 서울여자대학교 자연과학연구소 1997 자연과학연구논문집 Vol.9 No.-
Twenty-seven bacterial colonies capable of growing on benzoate as the sole source of carbon were isolated from streamside soils. Three of isolates were found to be extremely effective in metabolizing the benzoate, when they were incubated in the basal salt medium containing 2,000ppm of benzoic acid at 30℃ for 48hrs. The three isolates, Y205, W212 and J211 were identified Pseudomonas aeruginosa, Bacillus fastidiosus, and Aeromonas sp. respectively through morphological and physiological examination. Optimal temperature and pH for benzoate degradation of the isolates appeared to be 35℃ and pH for Pseudomonas sp. Y205 and Bacillus. sp. W212, and 30℃ and pH 7.0 for Aeromonas sp. J211. The highest degradation of benzoate by the three isolates was obstained in the growth media containing ammonium sulfate as nitrogen source. Optimal concentration of ammonium sulfate was 6.0g/l for Pseudomonas sp. Y205 and Aeromonas sp. J211, and 4.0g/l for Bacillus. sp. W212. When the three isolates were cultivated in basal salt medium containing 2,000ppm benzoate under optimal condition, they showed a logarithmic phase growth 12hours and a stationary phase growth 18hours after innoculation, and the benzoate degradation of 91.15-92.40% after 72-hours incubation. Benzoate degradation increased in parallel with the cell growth.
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