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실린더 후류를 이용한 아음속 디퓨저 유동의 제어에 관한 연구
오대근,윤복현,김태호 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
The present study addressed a computational work to investigate the influence of a turbulent wake flow on the pressure recovery of subsonic diffuser. The turbulent wake is generated by a cylinder with a small diameter, which is installed at the diffuser inlet of a 2-dimensional diffuser Computation are applied to three-dimensional steady Navier-Stokes equations. The computational results are qualitatively well compared to existing experimental results. The results show that the diffuser pressure recovery of the subsonic diffuser is dependent on the diameter and location of the cylinder. It is found that a certain diameter and location of cylinder to generate the turbulent wake give a better pressure recovery, compared with no cylinder flow
MR Findings of Extrauterine Mu ?llerian Adenosarcoma Associated with Deep Pelvic Endometriosis
오대근,김찬교,박병관,김지영 대한영상의학회 2008 대한영상의학회지 Vol.58 No.2
Extrauterine m¨ullerian adenosarcoma is a very rare tumor and it is characterized by a benign glandular component and a low-grade sarcomatous stromal component. These tumors have been reported to arise from ovarian or extraovarian endometriosis. However, there are scant reports on the MR findings of extrauterine mu ¨llerian adenosarcoma arising from deep pelvic endometriosis. We describe here a case of a large infiltrating extrauterine m¨ullerian adenosarcoma arising from recurrent deep pelvic endometriosis and we discuss its MR findings.
노즐내 물체의 후류가 아음속 이차원 제트구조에 미치는 영향에 관한 수치해석적 연구
오대근,윤복현,김태호 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
A turbulent wake generated by a cylinder in nozzle contraction affects to the jet flow characteristics. In this study, a computational work to investigate the effect of the turbulent wake on two-dimensional subsonic jet was carried out with three different kinds of nozzle. computations are applied to the two-dimensional unsteady, Navier-Stokes equations. Several kinds of turbulent models and wall functions are employed to validate the computational predictions. It was known that the wake flow enhanced the spread of the jet flow, compared with no wake flow condition. It was also found that the jet core is shortened by the wake flow developed from a control cylinder.
성숙기간과 후숙기간을 달리한 대목용 박(Lagenaria siceraria Standl.) 종자의 발아율
오대근,우영회,전진우,Oh, D.G.,Woo, Y.H.,Chun, J.W. 국립한국농수산대학교 교육개발센터 2018 현장농업연구지 = Journal of practical agricultural resear Vol.20 No.2
This study was conducted to elucidate the effect of after-ripening of gourd fruits before seed collection. Five varieties of commercial gourd varieties were cultivated and the fruits were picked after 24, 31, 50, and 70 days from pollination. For after-ripening treatments the fruits were placed for five days in a cool, air-circulated place while a number of fruits were placed for longer periods to 85 days including growing period, 24 + 62 days, 31 + 55 days, 50 + 35 days, and 70 + 15 days. The seeds collected from fruits harvested on 24<sup>th</sup> day were not emerged at all, but the seeds from after-ripening treatment for 62 days showed 78% emergence or higher. The growth of seedlings showed the effects of after-ripening treatment of the fruits before seed collection; the seeds collected after ripening treatment showed better hypocotyl growth and larger embryo size than the non-treated seeds.