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Schizandrin함량이 높은 음료개발올 위한 오미자 (Schizandra chinensis Baillon) 추출조건
최은오,이봉수,박용수,서은옥,정봉우,Choi, Eun-Oh,Lee, Bong-Soo,Park, Yong-Su,Seo, Eun-Ok,Chung, Bong-Woo 한국생물공학회 2008 KSBB Journal Vol.23 No.3
오미자를 이용한 고기능성 음료개발을 위하여 이번 연구에서는 추출조건별로 오미자의 기능성분 함량 및 anthocyanin 색소에 대한 최적 추출조건을 설정하였다. 분쇄하지 않은 오미자를 이용해서 추출한 경우, Bl값은 차이가 없었으나, schizandrin은 20% 수준에 그쳐 최종적으로 분쇄한 오미자를 시료로 설정하였다. 분쇄한 오미자는 $40^{\circ}C$, 75% ethanol로 추출했을 때 schizandrin 함량이 가장 높았으며, Bl 값은 온도와 ethanol 함량이 높아 질수록 감소하였다. 높은 기능성과 제품의 관능성을 고려할 때 schizandrin 함량과 Bl값을 최적으로 만족하는 조건은 분쇄 오미자를 $46^{\circ}C$에서 24% ethanol을 사용하여 3시간 추출했을 경우 높은 값을 얻을 수 있었다. Omija (Schizandra chinensis Baillon) has five lignans such as schizandrin, gomisin A, gomisin N, gomisin C and schizandrin C. Its major constituent, schizandrin, has a deterrent effect on nephrotoxicity of cisplatin, blood sugar and an ulcer of the stomach. In this study, we have investigated optimized extraction condition to make high functional beverage by quantifying schizandrin and measuring of browning index. Browning index was used as an index of color deterioration of anthocyanin. Browning index was decreased according to increment in extraction temperature and ethanol concentration. The optimum extraction time, extraction temperature and alcohol concentration levels were 3 hrs, $46^{\circ}C$ and 24% alcohol for high schizandrin concentration and desired browing index.
최은오,김희송,홍동표,Choi, Eun-O,Kim, Hei-Song,Hong, Dong-Pyo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.11
Torsional vibration is to vibrate strongly when the ignition pulses of the engine is excited with natural frequency of driveline. Torsional vibration like this can cause various noises as rattle and booming. For this study multi-degree of freedom analysis model of torsional vibration, which is combined with mass moment of inertia and torsional spring, was developed toward two wheel drive, four wheel drive and torsional vibration characteristics were compared and analyzed through the natural frequences, mode shapes and frequency response characteristics which was acquired by the simulation of it. The pertinence of that model was proved by the field test and the outcome of the simulations coincided with feeling test. Therefore, four wheel drive simulation model is considered to be useful thing for reducing torsional vibration of driveline and developing full-time four wheel drive vehicles.
서은옥(Eun-Ok Seo),최은오(Eun-Oh Choi),윤영상(Yeoung-Sang Yun),정봉우(Bong-Woo Chung) 동아시아식생활학회 2008 동아시아식생활학회지 Vol.18 No.1
White bread containing lotus root powder was previously reported as unsatisfactory with respect to appearance and chewiness. In this research, white bread samples were prepared using ethanol(2 wt.%) and lotus root powder(3, 6, or 9 wt. %), and compared to those prepared without ethanol (reference breads). The volumes and heights of the reference breads increased with increasing lotus root powder content. The moisture contents of the breads prepared with ethanol were higher than those of the corresponding reference breads. The hardness and fracturability of the breads made with ethanol were lower than those of the reference breads; however, springiness, cohesiveness, adhesiveness and chewiness were enhanced. In terms of appearance and sensory qualities, optimum results were obtained when the ethanol was added along with 6 wt. % lotus root powder. Overall, the results indicate that adding ethanol can improve the quality of white breads that contain lotus root powder.
최은오,김희송,안병민,홍동표 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.3
Eigenvalue analysis of vibration mode and an analysis by frequency response among the methods of predicting gear noise are related with transmitting sound of vibration. In this study we intended to reduce the vibration noise of differential gear by reducing torque fluctuation of drive pinion shaft which causes vibration noise of differential gear in rear wheel drive vehicles. For this we developed multi-degree of freedom analysis model in which mass moment of inertia and torsional spring combined and we examined the influence of torsional vibration of driveline elements by performing forced vibration analysis of engine excitation torque. We studied the methods for reducing torsional vibration of driveline according to the design factor of propeller shaft and examined the effect reducing vibration in differential gear by flexible coupling.
기어쌍의 래틀진동에 대한 영향도 평가 및 기어 진동 저감을 위한 대책 제시
안병민,최은오,홍동표 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3
In recent year, as the demand about low vibration and noise vehicle is increased constantly, automobile companies try to a lot of things to achieve this demand. Gear rattle vibration become an emergency problem to be cured at idling. There are two kinds method to reduce idle gear rattle vibration. One is optimization of clutch damper design parameters(stiffness, hysteresis torque, preload, length of 1st stage), the other is system parameters modification(inertia, drag torque, backlash, etc.). But these methods are impossible to estimate influence rate of each gearpair on the idle gear rattle vibration. In this study, 14 degrees of freedom nonlinear model is developed to analyze influence rate of each gearpair on the idle gear rattle vibration and the counterplan to reduce the gear noise is suggested through the shift system modification.
安大植,崔銀午 충주대학교 산업대학원 1999 大學院論文輯 Vol.1 No.-
The powertrain is a system of exciters which are connected by vibration transmitters and noise radiators. The powertrain has infinite natural frequencies. If the engine explosion excites a certain natural frequency, then the powertrain system seriously vibrates. The torsional vibration arises from here. Torsional vibration like this can cause various noises as rattle and booming. In this study,the simulation models of multiple degrees of freedom were developed to reduce the torsional vibration of the powertrain. These models are combined mass moment of inertias with torsional springs. The free and forced vibration analyses were carried out by these models;and the validity of the simulation models were checked by the field test. The reduction effect of the torsional vibration along the driveline design factor is presented by the analytical results.