http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이오석,정용진,하영득,김경은,신진숙,권훈,Lee, Oh-Seuk,Jeong, Yong-Jin,Ha, Young-Duck,Kim, Kyungeun,Shin, Jin-Suk,Kwon, Hun 한국식품저장유통학회 2001 한국식품저장유통학회지 Vol.8 No.4
본 연구에서는 현미의 무증자 알콜발효조건을 설정하고자 반응표면분석으로 알콜발효조건을 모니터링하였다. 그 결과 무증자 알콜발효에 적합한 S. cerevisiae GRJ를 선발할 수 있었다. 알콜함량, brix, pH 및 총산에 대한 회귀식의 $R^2$는 각각 0.8828, 0.8409, 0.9431 및 0.9280이였다. 무증자 알콜발효에서 알콜함량의 최대치는 효소제 함량 0.34%(w/w) 및 가수량 350(v/w)의 범위에서 얻을 수 있었다. 최적조건에서 실제 실험값과 예측값들은 유사한 경향을 나타내었다.. This study was carried out to set up alcohol fermentation condition for uncooked brown rice. Response surface methodology(RSM) was applied to optimize and monitor of the alcohol fermentation condition with uncooked brown rice. The optimal yeast strain for fermentation of uncooked brown rice was S. cerevisiae GRJ. The polynomial equation for alcohol contents, brix pH and total acditiy showed 0.8828, 0.8409, 0.9431 and 0.9280 of R$^2$, respectively. Optimum range of uncooked alcohol fermentation for maximum alcohol contents were 0.34%(w/w) of enzyme concentration and 350%(w/w) of added water content, respectively. Predicted values at optimum alcohol fermentation condition agreed with experimental values.
무가압침투법으로 제조된 SiC 입자 강화 A1 합금 기지 복합재료의 고온 크립 거동에 기지 합금 조성이 미치는 영향
김용석,권훈,송명훈 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.5
High temperature creep behaviour of 20 vol.% SiC particle reinforced 5052 Al, 6061 Al and 7075 Al alloy matrix composites was studied at temperatures of 633, 663, and 693K under the applied stress range of 25∼100 ㎫. The composites were manufactured by the pressureless infiltration technique. The composites showed high apparent stress exponent and activation energy. The 7075 Al matrix composite showed the highest creep strength at 633K, while at 693K the 5052 Al matrix composite had the highest creep resistance. The creep strength of the 7075 Al matrix composite decreased rapidly with increase of the temperature. True stress exponent of the composites was measured as 5 and major creep mechanism of the composites was found to be lattice self-diffusion of the matrix alloy. Different temperature-dependence of the composites' creep strength and the threshold stress (including its origin) were attributed to different amount of precipitates and aluminum nitrides in the matrix alloys.
무가압 침투법으로 제조된 BN 입자 강화 Al-5wt.%Mg 기지 복합재료의 고온 크립 특성
김용석,권훈,송명훈 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.9
High temperature creep behaviour of Al-5 wt.% Mg alloy matrix composite reinforced with 7.5 vol.% BN flakes was studied at temperatures of 300, 330, and 300℃ under the applied stress range of 15-80 ㎫. The composite was manufactured by the pressureless infiltration technique in a nitrogen atmosphere. The composite showed high apparent stress exponent and activation energy. Threshold stress was also shown, which was strongly temperature dependent. True stress exponent of the composite was measured as 5 and true activation energy was found to be 131 KJmol^(-1), which is close to the self-diffusion activation energy of pure Al. The major creep mechanism of the composite was found to be lattice self-diffusion of the matrix alloy. Aluminum nitride(AlN) and other compounds such as AlB₂, which were formed in the matrix during the pressureless infiltration process, seemed to be the cause of the threshold stress and the high creep resistance of the matrix alloy.