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루프 열사이폰 내부 증기유동에 대한 수치해석과 실험결과 비교
이윤용(Yun Yong Lee),강환국(Hwan Kook Kang),김대영(Dae Young Kim),김영득(Young Deug Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In this study, the experiments and numerical analysis were carried out for the purpose of designing the loop thermosyphon used in the ESS battery room, for the characteristics of vapor pressure drop and the friction coefficient according to various types of working fluid and vapor flow operating in the room temperature range. It is important to design the microchannel and the vapor line with the prediction of the flow resistance considering the physical properties of the working fluid in the loop thermosyphon.
뇌하수체 미세선종에 의한 쿠싱병의 접형골경유 수술의 치료성적
이윤용(Yun Yong Lee),김진성(Jin Seong Kim),문병술(Byeong Sul Mun),신찬수(Chan Soo Shin),김성연(Seong Yeon Kim),조보연(Bo Youn Cho),이홍규(Hong Kyu Lee),고창순(Chang Soon Koh),정희원(Hee Won Joeng),한대희(Dae Hee Han),한문희(Moom Hee 대한내과학회 1997 대한내과학회지 Vol.53 No.6
Background: Cushing's disease is a hypercortisolic state attributable to hypersecretion of ACTH at pituitary gland Most of these diseases are due to pituitary microadenoma. Selective removal of adenoma by transsphenoidal microsurgery is the treatment of choice for Cushing's disease. We evaluated 25 cases to analyze results of transsphenoidal microsurgery and to identify prognostic factors that may predict successful outcome. Methods: From 1989 to 1995, 25 patients were diagnosed as having Cushing's disease in Seoul National University Hospital. They were underwent pituitary microsurgery and confirmed to have pituitary microadenoma radiologically and pathologically. About these patients. retrospective evaluation was done. Results: The patients consist of 21 females and 4 males and the age was ranged from 23 to 49 years. 19 patients (76%) were judged as immediate remission. The preoperative clinical, hormonal, and radiological characteristics of the remission and failure groups were similiar The patients who were immediate remission were followed from 3 months to 72 months. 3 patients had recurrences(15.8%) at 4, 8, 49 months after operation. The pre and postoperative clinical, hormonal, and radiological characteristics of the long-term remission and recurrence groups were similiar. We could not find any predictable factors of surgical outcome. Conclusion: The first line trearment of Cushing's disease is transsphenoidal microsurgery. However considering relative late and high rate of recurrence of Cushing's disease following curative surgery, careful longterm follow up is mandatory.
반도체 표면처리공정용 대면적 히터 플레이트의 열전달 특성에 관한 연구
이윤용(Yun-Yong Lee),강환국(Hwan-Kook Kang),문석환(Seok-Hwan Moon) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.6
The numerical study for the effect of various factors that affect the temperature distribution of the process glass installed above the large rectangular heater plate was carried out. For the calculation, heat flux, distance between heat source and process glass plate, effect of vacuum condition and convection in a chamber were considered as important factors. The results showed that the temperature gradient on the glass was increased at the natural convection because of the buoyancy force increases due to the heated air. Also, the more heat flux and distance between the heater plate and glass increases, the more increasing the temperature gradient was. In the case of isothermal heating wall, the temperature variation was smaller than the uniform heat flux condition.