• 한국연초학회지
• /
• 제26권2호
• /
• pp.109-116
• /
• 2004

This study was conducted to investigate the composition of flavor components of Elsholtzia ciliata and Eisholtzia splendens in order to obtain basic informations for the application of tobacco and food industry. Flavor components extracted were divided into three fractions ; essential oil, absolute and oleoresin from E. ciliata and E. splendens. Essential oil was extracted by simultaneous steam distillation(SDE), absolute and oleoresin were extracted by $100\%$ n-hexane and $50\%$ ethanol, respectively. Yields of the essential oil, absolute and oleoresin fractions from E. ciliata were $0.34\%,\;11.34\%\;and\;15.24\%,$ and those from E. splendends were $0.28\%,\;12.45\%\;and\;9.95\%$, respectively. The major components of essential oil of E. ciliata were naginata ketone$(29.37\%)$, elsholtzia ketone$(14.37\%)$ and rosefuran$(11.76\%)$. The major components of essential oil of E. splendens were 2-cyclohexen-1-one$(26.81\%)$, elsholtzia ketone$(13.46\%)$ and naginata ketone$(5.26\%).$ The composition of flavor components showed a slight difference between essential oils of E. ciliata and E. splendens. The major components of absolute fraction from E. ciliata were linoleic acid$(12.07\%),$ palmitic acid$(10.46\%)$ and 2-cyclohexene-1-one$(5.39\%).$ And those from E. splendens were linoleic acid$(12.38\%),$ palmitic acid$(9.47\%)$ and naginata ketone$(8.86\%).$ Ethyl linoleolate was a major component in oleoresin of E. ciliata and E. splendens.

• 한국가금학회지
• /
• 제25권1호
• /
• pp.1-9
• /
• 1998

This study was carried out to get the basic and applicable data for breeding plan and selection in order to improve the body shape components in Korean native chicken. The hentabilities and genetic correlations on body shape components were estimated by sire, dam and combined components of variance. Data analyzed were records of 1,096 progenies produced from 180 dams and 26 sires from April, 1994 to September, 1995. On body shape components at 4, 8 and 16 weeks of age, the shank lengths were 55.63, 82.94 and 103.8Omm: breast girths were 15.087, 21.069, and 26.137mm: breast widths were 40.910, 54.575 and 73.088mm, respectively. The estimates of hentabilities of body shape components based on the variance of sires, dams, and combined components at 4, 8 and 16 weeks of age were O.O65~O.197, O.25O~O.794 and O.185~O.495 for shank length: O.123~O. 215, O.033~O.513 and 0.063~0.257 for breast girth; 0.024~0.158, 0.118~0.410 and 0.111~0.222 for breast width, respectively. The coefficients of genetic correlations among the body shape components at 4 weeks of age were 0.565, 0.725 and 0.678 for breast girth with breast width, shank length and tibia length : 0.690 and 0.804 for breast width with shank length and tibia length; 0.972 between shank length and tibia length.

• 한국환경과학회지
• /
• 제18권1호
• /
• pp.61-72
• /
• 2009

Fabrication and oxidants production of 3 or 4 components metal oxide electrode, which is known to be so effective to destruct non-biodegradable organics in wastewater, were studied. Five electrode materials (Ru as main component and Pt, Sn, Sb and Gd as minor components) were used for the 3 or 4 components electrode. The metal oxide electrode was prepared by coating the electrode material on the surface of the titanium mesh and then thermal oxidation at $500^{\circ}C$ for 1h. The removed RhB per 2 min and unit W of 3 components electrode was in the order: Ru:Sn:Sb=9:1:1 > Ru:Pt:Gd=5:5:1 > Ru:Sn=9:1 > Ru:Sn:Gd=9:1:1 > Ru:Sb:Gd=9:1:1. Although RhB decolorization of Ru:Sn:Sb:Gd electrode was the highest among the 4 components electrode, the RhB decolorization and oxidants formation of the Ru:Sn:Sb=9:1:1 electrode was higher than that of the 3 and 4 components electrode. Electrogenerated oxidants (free Cl and $ClO_2$) of chlorine type in 3 and 4 components electrode were higher than other oxidants such as $H_2O_2\;and\;O_3$. It was assumed that electrode with high RhB decolorization showed high oxidant generation and COD removal efficiency. OH radical which is electrogenerated by the direct electrolysis was not generated the entire 3 and 4 components electrode, therefore main mechanism of RhB degradation by metal oxide electrode based Ru was considered indirect electrolysis using electrogenerated oxidants.

• 정보처리학회논문지D
• /
• 제12D권3호
• /
• pp.385-394
• /
• 2005

컴포넌트 기반 소프트웨어 개발(Component-based software Development) 환경에서 컴포넌트간의 의존관계 정보를 제공하는 것은 컴포넌트를 합성하는 개발자에게 중요한 일이다. 그러나 컴포넌트의 의존관계 정보가 충분하게 제공되지 않고 있다. 따라서 개발자는 원시 컴포넌트의 의존관계를 모르고 컴포넌트를 합성하는 경우가 발생한다. 본 논문에서는, 위와 같은 단점을 보완하기 위하여, 컴포넌트 사이의 의존정보를 XML로 정의하여 관리하고, 개발자에게 원시 컴포넌트 의존관계 정보를 제공하여, 무결성 있고 영속성 있는 정보 시스템 개발을 위한 컴포넌트 의존정보를 제공하는 의존 관리자의 설계와 구현을 하였다. 의존 관리자에서 생성된 컴포넌트는 재사용성 측정 메트릭의 측정값이 $89\%$에서 $95\%$가 신뢰구간 안에 포함되어 있음을 보이고 있다.

• 한국정보과학회논문지:소프트웨어및응용
• /
• 제29권7호
• /
• pp.487-497
• /
• 2002

컴포넌트 기반의 재사용 기술이 소개되면서 소프트웨어 컴포넌트의 유통이 인터넷을 통한 온라인 기반의 유통 형태로 변하게 되었다. 이를 위해서는 유통 모델이 필요하며, 유통 시스템의 구축이 이루어져야 한다. 더욱이 유통 시스템이 효율적으로 운영되기 위해서는 컴포넌트들을 효율적으로 관리, 검색하기 위한 분류 체계가 마련되어야 한다. 본 논문은 이러한 유통 시스템 구축에 필요한 컴포넌트 분류 체계를 6가지 관점을 기반으로 한 컴포넌트 분류체계를 제시하고 BNF 표기법을 이용하여 명세한다. 제시된 분류체계의 효율성을 검증하고 기존의 분류체계들과 비교하기 위해 개발된 컴포넌트들을 적용하여 적중율과 정확도를 측정하여 실험 및 평가한다. 본 논문에서 제시한 기법이 기존의 분류기법에 비해서 여러 각도에서 분류하기 때문에 컴포넌트의 검색이나 등록이 효율적으로 이루어질 수 있도록 한다.

• Preventive Nutrition and Food Science
• /
• 제14권4호
• /
• pp.349-353
• /
• 2009

The effects of packaging materials on preserving the functional component of pine bud beverage stored under UV (ultraviolet) light exposure conditions were studied. The order of UV light blocking properties of the selected packages was: opaque can> opaque PET (polyethylene terepthalate) with green lamination=transparent PET with 10% PEN (polyethylene naphthalate) blending> transparent PET, and did not depend on film thickness in specified range. At 20${^{\circ}C}$, the order of preserving degree of original color and endobornyl acetate, which is quality index of pine bud beverage, was the same as above. Exposure to UV light can cause of deterioration of functional food components, but green color lamination and blending of PEN materials with transparent PET help to preserve the UV sensitive pine bud beverage components. However, the treated PET bottles have poorer preservation capabilities than the opaque cans. Transparent PET with PEN blending, in particular, will be very useful packaging material for colorful functional beverage preservation by helping to protect the ingredients while attracting consumer attention.

• Journal of Electrical Engineering and Technology
• /
• 제4권3호
• /
• pp.396-400
• /
• 2009

In this paper, electromagnetic topology (EMT) was used to analyze the electromagnetic compatibility (EMC) of RF circuits including passive and active components. It is difficult to obtain usable results for problems relating to electromagnetic coupling in complex systems when using conventional numerical or experimental methods. Thus it is necessary to find a new methodology for analyzing EMC problems in complicated electromagnetic environments. In order to consider the nonlinear characteristics of active components, a SPICE diode model was used. A power detector circuit and the receiver circuit of a radio control (RC) car were analyzed and experimented in order to verify the validity of this method.

• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 2000년도 추계 학술대회논문집
• /
• pp.129-134
• /
• 2000

An efficient numerical method to solve the unsteady incompressible Navier-Stokes equations is developed. A fully implicit time advancement is employed to avoid the CFL(Courant-Friedrichs-Lewy) restriction, where the Crank-Nicholson discretization is used for both the diffusion and convection terms. Based on a block LU decomposition, velocity-pressure decoupling is achieved in conjunction with the approximate factorization. Main emphasis is placed on the additional decoupling of the intermediate velocity components with only n th time step velocity The temporal second-order accuracy is Preserved with the approximate factorization without any modification of boundary conditions. Since the decoupled momentum equations are solved without iteration, the computational time is reduced significantly. The present decoupling method is validated by solving the turbulent minimal channel flow unit.

• 전기학회논문지P
• /
• 제59권1호
• /
• pp.18-23
• /
• 2010

As the increasing of Non-linear load, we have been growing interest for the harmonics. Harmonics has been focused on the current component rather than voltages. Voltage harmonics can be mainly generated at the PCC with non-linear load and act on voltage unbalance. Voltage harmonics can be enlarged at the capacitor with low impedance as frequency increases. Capacitor is basically used for the power-factor compensation and sometimes as the passive filter. Small voltage of low-order acts on quite a few at the capacitor by the current increase. Capacitor has easily fall under by harmonic components. In this paper, we measured the magnitude and phase angle of asymmetrical voltage with harmonics components at the PCC and calculated with the same condition. we concluded that voltage harmonics of higher order increase each current component but have a little effect on capacitor rating.

• 대한기계학회논문집
• /
• 제18권12호
• /
• pp.3246-3252
• /
• 1994

The vibration of meshing gear system is originated form teeth deformation, teeth contact ratio, profile error, etc. The gear vibration is classified as whine vibration during meshing and as rattle vibration during idling. In this study, the whine vibration is investigated under the assumption of piecewise linearity of elastic stiffness due to the variation of meshing. Numerical, theoretical and experimental investigations show the existence of the superharmonic components of the second and the third order. consistently It can be concluded that the superharmonic components in whine vibration of meshing gear is originated from the stiffness variation. It also shows that the higher order harmonics are reduced on the increase of motor speed.