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이석영(Suk-young Lee),전충환(Chung-\han Jeon),장영준(Young-june Chang) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3
The concept of this engine was created by Ko in 1996 year. Performance simulation for this engine is presented in this paper. The volume of chamber at eccentric shaft angle is evaluated by using geometric models of rotor and rotor housing. A thermodynamic model which includes the first law of thermodynamics, combustion and heat transfer from chamber contents to surroundings is employed. Three processes of gas compression, combustion and expansion are considered and the pressure, temperature and heat release at each shaft angle in each process are computed in this performance simulation. If this engine is manufactured, this performance simulation must be useful for optimal design of this engine with parametric study for various design parameters and operating conditions.<br/>
유석영,이영준,송호성,홍희도,임정호,최현선,이부용,강석남,이옥환,Yu, Seok-Yeong,Lee, Young-Jun,Song, Ho-Seong,Hong, Hee-Do,Lim, Jeong-Ho,Choi, Hyeon-Son,Lee, Boo-Yong,Kang, Suk-Nam,Lee, Ok-Hwan 한국식품영양학회 2012 韓國食品營養學會誌 Vol.25 No.4
본 연구에서는 오가피순 추출물의 항산화 효과를 평가하였다. 오가피순 추출물의 총 페놀 함량과 플라보노이드 함량은 각각 $116.33{\pm}6.09mg\;GAE/g$, $65.07{\pm}4.10mg\;RE/g$으로 나타났다. 오가피순 추출물의 항산화능은 다양한 항산화 모델(DPPH, FRAP, Reducing power, ABTS, ORAC assay)을 이용하여 평가하였다. ORAC assay를 제외한 위의 항산화 모델에서는 0.1, 0.5 및 $1.0mg/m{\ell}$의 농도로 측정한 결과, DPPH 라디칼 소거능은 오가피순 추출물의 농도가 증가함에 따라 $23.3{\pm}0.8$, $28.8{\pm}1.3$ 및 $33.7{\pm}3.7%$로 평가되었고, ABTS 경우에는 6.42, 12.47 및 16.69%로 측정되었다. 또한, FRAP 활성은 0.081, 0.160 및 0.259로, Reducing power는 0.034, 0.097 및 0.180으로 나타나 추출물의 농도가 증가함에 따라 항산화활성도 증가하였다. 한편 $0.1mg/m{\ell}$에서의 ORAC value는 $103.4{\pm}3.6{\mu}M\;TE/g$으로 나타났고, 아질산염 소거능은 0.1, 0.5 및 $1.0mg/m{\ell}$의 농도에서 각각 3.6, 9.0 및 13.2%로 나타났다. 최근 건강기능 식품의 관심도가 증가하는 것을 고려해 볼 때, 오가피순 추출물은 기능성식품 또는 천연 항산화제의 소재로써의 이용 가능성을 보였다. This study was conducted to examine the antioxidative effect and nitrite scavenging ability of extract from Acanthopanax cortex shoot. The total phenolic compound and flavonoids contents of extract from Acanthopanax corex shoot were $116.33{\pm}6.09mg\;GAE/g$ and $65.07{\pm}4.10mg\;RE/g$, respectively. Antioxidative activities were measured by various in vitro models such as DPPH radical scavenging activity, FRAP, reducing power, ABTS radical scavenging activity, ORAC assay. This results showed that the extract of Acanthopanax cortex shoot was effective in scavenging radicals and protecting oxidation when assessed various in vitro systems. Similarly, the nitrite scavenging ability of extract was increased in a dose-dependent manner. Moreover, ORAC value at a concentration of $0.1mg/m{\ell}$ was $103.4{\pm}5.6{\mu}M\;TE/g$. Considering high consumer demand beneficial health effects, Acanthopanax cortex shoot can be utilized to develop functional food health-promoting and natural antioxidant agents.
이석영(Suk Young Lee),김규보(Gyu Bo Kim),박호준(Ho Jun Park),전충환(Chung Hwan Jeon),장영준(Young June Chang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study deals with the result of exhaust emission and performance calculated by simulation of the fuel injection characteristics of the inline injection system in a diesel engine. The emission are calculated through non-equilibrium by using the extended Zel'dovich kinetic mechanism for NOx and equilibrium method for OH, CO, H₂, H and soot concentrations. And comparison of the model predictions with the other experimental value show reasonably agreement. Detailed prediction results showing the sensitivity of the model by injection rates are presented and discussed.<br/>
HSDI 디젤엔진의 연료분사계와 연소현상을 연계한 수치해석
이석영(Suk-Young Lee),허강열(Kang-Yul Huh) 한국연소학회 2010 한국연소학회지 Vol.15 No.1
In this study, the coupled simulation of fuel injection model and three-dimensional KIVA-3V code was tried to develop an algorism for predicting the effects of varying fuel injection parameter on the characteristics of fuel injection and emissions. The numerical simulations were performed using STAR-CD code in order to calculate the intake air flow, and the combustion characteristics is examined by KIVA-3V code linked with the conditional moment closure(CMC) model to predict mean turbulent reaction rate. Parametric investigation with respect to twelve relevant injection parameters shows that appropriate modification of control chamber orifice diameter, needle valve spring constant and nozzle chamber orifice diameter can significantly reduce NOx and soot emissions. Consequently, it is needed to optimize the fuel injection system to reduce the specific emissions such as NOx and soot.