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Bakers' Yeast를 이용한 m-Bromonitrobenzene 및 Nitrosobenzene의 환원반응
김경순,백운필,오성환,Kim, Kyungsoon,Baik, Woonphil,Oh, Sunghwan 대한화학회 1995 대한화학회지 Vol.39 No.10
방향족 니트로 화합물을 선택적으로 환원시켜 치환체가 있는 아닐린을 생성하는 것은 산업적 측면에서 볼때 의미있는 반응이다. 본 연구에서는 Bakers' Yeast-NaOH의 환원작용에 의하여 m-Bromonitrobenzene 의 니트로기가 선택적으로 빠르게 환원되어 치환체가 있는 아닐린 화합물이 형성됨을 확인하였고 특히 Nitrosobenzene이 수산화 나트륨이 없는 조건에서 Bakers' Yeast만의 작용에 의해 환원되어 아닐린을 생성함을 확인하였다. 또한 Nitrosobenzene의 Bakers' Yeast 환원에 미치는 저해제들의 효과 및 온도, pH의 영향 등을 조사하였다. Rapid and selective reduction of aromatic nitro compounds is of important for the preparation of amino derivertives in organic synthesis, particularly when a molecule has other reducible substituents. While Bakers' Yeast has been used for the enantioselective reduction of carbonyl compounds, little attention has been paid to the reduction of aromatic nitro compounds with Bakers' Yeast. Nitro group of m-bromonitrobenzene was selectively and rapidly reduced to corresponding amino derivative in good yield by Bakers' Yeast in basic solution. Furthermore, nitrosobenzene was rapidly reduced to aniline in good yield by Bakers' Yeast under neutral condition. In this paper, we wish to report a rapid and simple reduction of m-bromonitrobenzene and nitrosobenzene to the corresponding amino derivatives using Bakers' Yeast. And the effects of various agents, temperature and pH on the reduction will be discussed.
기덕종(Dockjong Ki),오성환(Sunghwan Oh),이미현(Mihyeon Lee),김지현(Jihyun Kim) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
고고도에서 저속으로 비행하는 가스터빈엔진의 운용성 확인을 위해 압력 환경만을 모사하는 기존 시험설비에 온도모사를 위한 장치와 소형엔진 시험에 적합하도록 일부 장치를 추가하여 저속비행용 공기흡입식 엔진 고도시험장치를 개발하였다. 성능자료가 확보된 기존엔진의 비교시험을 통해 시험장치의 신뢰도를 확보하였고 45,000ft 고도까지 시험이 가능함을 확인하였다. An altitude engine test facility(AETF) for low speed flight air breathing engine was developed by adding temperature simulation system and some other subsystems necessary for small engine test to the existing test facility, which can simulate altitude pressure only. The reliability of the test facility was validated by testing an engine for which the performance is known. Capability of the test altitude was confirmed to be 45,000ft.
가스터빈 엔진의 손상 진단을 위한 퍼지 경향감시 방법에 관한 연구
공창덕(Changduk Kong),고성희(Seonghee Kho),기자영(Jayoung Ki),오성환(Sunghwan Oh),김지현(Jihyun Kim),고한영(Hanyoung Ko) 한국추진공학회 2008 한국추진공학회지 Vol.12 No.6
This work proposes a fuzzy trend monitoring method for the fault detection of a gas turbine engine through analyzing measured performance data trend. The proposed trend monitoring technique can diagnose the engine status by monitoring major engine measured parameters such as fuel flow rate, exhaust gas temperature, rotor rotational speed and vibration, and then analyzing their time deppendent changes. In order to perform this, firstly the measured engine performance data variation is formulated using Linear Regression, and then faults are isolated and identified using fuzzy logic.
벼 조생흑찰의 시비조건에 따른 생육 및 안토시아닌 함량변이
오성환,김상열,최원영,서종호,황정동,이휘종,조준현,권영업,남민희,이철원 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2
Anthocyanin production of black pigmented rice is generally influenced by cultivation environments like transplanting date, cultivation location and fertilization method. This study was carried out to establish an optimum fertilizer application method for production of black pigmented rice with high anthocyanin content. Eight fertilization treatments(NPK, NPK+Si, NPK+Compost, PK, NK, NP, Compost, No Fertilizer) were evaluated with a back pigmented rice cultivar, Josaengheugchal, from 2013 to 2014. Heading date of Josaengheugchal in most fertilization treatments was August 6 to 9 but heading date of NK(P0) treatment was late on August 16. Anthocyanin content was fluctuated between 2013 to 2014. Anthocyanin content of Josaengheugchal in 2014 was higher than that of 2013 because average temperature of ripening stage in 2014 was lower by about 3.2oC than that of 2013. In 2013, anthocyanin content of Josaengheugchal during 30 days after heading(DAH) was decreased by 15.6 mg with increasing average temperature of 1oC. However, temperature effect on anthocyanin content of Josaengheuchal was not observed in 2014 because no significant correlation between average temperature and application treatments was observed. On the other hand, anthocyanin content was significantly influenced by fertilization treatments. Anthocyanin content of Josaengheuchal was highest at the NPK+Compost treatment showing about 17% and 62% higher than NPK, No-Fertilizer treatments, respectively. Total amount of anthocyanin production was also highest with NPK+Compost, higher about 30%, 288% than NPK, No-Fertilizer, respectively.