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초음파 연료 공급장치를 사용한 디젤자동차의 주행성능에 관한 연구
신현동(H. D. Shin),설진호(J. H. Seol),남승덕(S. D. Nam),류정인(J. I. Ryu) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
The utrasonic fuel feeding system was developed to enhance the driving performance and to reduce the smoke.<br/> From the experiments of chassis dynamometer test and driving test of diesel vehicle. the vehicle by using the ultrasonic fuel feeding<br/> system has more advatages of low BSFC. low smoke and high power.
돼지 정액의 동결시 Taurine과 $\alpha$-Tocopherol 첨가가 동결$\cdot$융해 정자의 성상과 기능에 미치는 영향
신현아,김창근,정영채,방명걸,Shin H. A.,Kim C. K.,Chung Y. C.,Pang M. G. 한국동물번식학회 2005 Reproductive & developmental biology Vol.29 No.3
The present study evaluated whether an exogenous antioxidants, taurine and $\alpha$-tocopherol, could, when added to the freezing extender, improve the post-thaw sperm characteristics, function, the level of reactive oxygen species (ROS) generation, and the level of lipid peroxidation (LPO) in frozen-thawed porcine semen. CASA (computer-aided sperm analysis), HOST (hypoos-motic swelling test), chemiluminescence using luminol and lucigenin and the detection of malondialdehyde for LPO was performed in frozen-thawed porcine sper-matozoa. The results obtained in these studies are as follows. While no beneficial effects of taurine and $\alpha$-tocopherol supplementation were visible in motility, viability, acrosome reaction, tail swelling patterns, and the generation of $O^{2-}$ of frozen-thawed porcine sper-matozoa, $H_{2}O_{2}$ was decreased by all treatments except taurine 50mM treatment. In conclusion the taurine and $\alpha$-tocopherol treatments during freezing reduced generation of reactive oxygen species and production of malondialdehyde in frozen-thawed porcine semen, and the ROS savangers may minimize various damages of spermatozoa during freezing. 본 연구는 돼지 정자 동결시 taurine과 $\alpha$-tocopherol의 첨가가 융해후 정자 성상과 정자 기능 활성산소계(reactive oxygen species; ROS)의 발생 정도 및 지질 산화(lipid peroxidation, LPO)에 미치는 영향을 구명하기 위하여 시행하였다. 1차 및 2차 희석액내 taurine과 $\alpha$-tocopherol이 첨가된 돼지 동결정액의 융해 후 정자 운동성 양상, 정자 생존성, 정자 기법을 적용하여 다음과 같은 결과를 얻었다. Taurine(25mM, 50mM), $\alpha$-tocopherol($500{\mu}M,\;1,000{\mu}M$ 단일처리군 그리고 taurine과 $\alpha$-tocopherol의 혼합처리군($25mM\~500{\mu}M\~1,000{\mu}M$)은 동결$\cdot$융해 후 대조군과 비해 정자 운동성과 생존성은 유의적인 차이를 나타내지 않았다. Taurine과 $\alpha$-tocopherol의 혼합처리군 $50mM\~1,000{\mu}M$에서 HOST, 점체 반응이 대조군과 비교하여 유의차는 인정되지 않았으나 다소 증가하였다. 동결$\cdot$융해 정자의 ROS 발생 억제를 위한 taurine과 $\alpha$-tocopherol의 모든 처리군은 대조군과 비교하여$\cdot\{O_2}{^-}$ 발생을 유의적으로 완화시키지 못하였다. 그러나 taurine 단일처리군(25mM), $\alpha$-tocopherol 단일처리군($50mM,\;1,000{\mu}M$)과 혼합처리군($25mM\~500mM,\;50mM\~1,000{\mu}M$은 $H_{2}O_{2}$의 발생을 대조군과 비교하여 유의적으로 완화시켰다(P<0.05). 동결$\cdot$융해 정자의 malondialdehyde의 생산은 taurine과 $\alpha$-tocopherol의 모든 처리군에서 대조군과 비교하여 유의적인 감소를 보였다(P<0.05). 이상의 결과를 종합해 보면 돼지 정액의 동결보존시 taurine와 $\alpha$-tocopherol 같은 항산화제의 처리는 ROS 발생과 LPO을 효과적으로 완화시킴에 따라 돼지 정액의 동결보존 효율을 증진시킬 수 있는 유용한 방법이라 사료된다.
수직관에서 2상선회유동이 보이드분포와 압력강하에 미치는 영향
김인석,손병진,신현동,곽기태,Kim, I.S.,Son, B.J.,Shin, H.D.,Kwack, K.T. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.2
This experimental investigation has been conducted to determine the effects of swirling angle and flow patterns on distributions of void fraction, bubble velocity and two-phase pressure drop in a vertical straight tube. Swirling angles of $0^{\circ}$ (non swirling), $30^{\circ}$, and $45^{\circ}$ were tested with air-water two components over a range of superficial air velocities. A transparent lucite tube of 38mm in internal diameter was used for the test section. The void fraction and bubble velocities were measured by means of a optical fiber probe at the upper part of the swirler in the test section. Pressure drops which seem to be closely related with flow patterns and swirling angle were measured by a differential pressure transducer. It is shown that the probability density functions of pressure drop demonstrate peculiar features for both swirling angles and flow patterns, whereas the distributions of void fraction and bubble velocities are parabolic and flat shape in the vicinity of tube center, respectively except bubbly flow in any swirling angle cases, and the void fraction increases with increasing swirling angle around the center of tube.
아세톤 광분해를 이용한 Molecular Tagging Velocimetry
이은도(Uen Do Lee),신현동(Hyun dong Shin),Jonathan H. Frank,Sebastian A. Kaiser 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Acetone molecular tagging velocimetry (MTV) was studied in a mini-jet configuration. Radial profile of the axial velocity at 2 ㎜ duct outlet is measured using acetone MTV. For the measurement, acetone is seeded into the flow, and a pulsed ArF (λ = 193 ㎚) excimer laser photodissociates the acetone along a narrow line. The excimer laser "tag" a line that is deficient in acetone and the line is "read" by planar laser fluorescence (PLIF) imaging of acetone using the frequency-doubled dye laser for excitation. This line is convected with the flow, and its displacement is measured from a pair of PLIF images acquired with different delay times between the excimer and dye lasers. The axial velocity is extracted from the cross correlation of the two PLIF images.