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한상엽 한국항공우주연구원 2012 항공우주산업기술동향 Vol.10 No.1
본 보고서는 미국, 러시아, 유럽, 일본 및 중국을 비롯한 전 세계 발사체 및 로켓 관련 기술을 개발/연구하고 있는 국가의 상용 또는 시험용, 연구용의 액체로켓엔진 개발기술에 관련된 정보를 수집 및 분석하는 것에 그 목적이 있다. 전 세계적으로 현재까지 약 900종 이상의 액체로켓엔진이 시험되고 개발/연구되어 왔다. 그 중 일부는 미국의 SSME 액체로켓엔진 및 러시아의 RD-107/RD-108 액체로켓엔진과 같이 상용으로 현재 위성 및 우주인 발사체에 투입되어 사용되고 있다. 본 보고서에 분석 정리된 액체로켓엔진은 케로신, 액체수소, 저장성 연료등을 연료로 사용하고 액체산소 등을 산화제로 사용하는 엔진들이며, 고체추진제를 사용하는 모터는 제외되어 있다. 특히 본 보고서에는 현재까지 국내에서 연구/개발되어 온 국내의 액체로켓엔진에 대한 개발기술도 포함하고 있다. The main purpose of this report is to acquire and analyze the information related to the development technology of liquid-propellant rocket engine(LRE) for commercial, experimental, or research purpose of world-wide nations such as U.S.A., Russia, Europe, Japan, and China which have been developing and studying the technology related to launch vehicles and rockets. Up to now more than nine-hundreds(900) of LRE's have been studied and developed world-wide. Among them, some engines such as SSME of U.S.A. and RD-107/RD-108 LRE's of Russia have been actively used for satellite launch vehicles and human space travel commercially. LRE's dealt in this report are using kerosene, liquid hydrogen, storable fuel, etc. as a fuel and liquid oxygen, etc. as an oxidizer. Rocket motors with solid propellants are excluded. Especially this report also includes the development technology of domestic LRE's.
고도근시와 난시 치료를 위해 시행한 ICL 및 반대안 토릭 ICL 삽입술의 임상결과
한상엽,문상정,김호숭,이태헌,이경헌.Sang Youp Han. MD. Sang Jung Moon. MD. Ho Soong Kim. MD. Tae Hun Lee. MD. Kyung Hun Lee. MD 대한안과학회 2010 대한안과학회지 Vol.51 No.6
Purpose: We compared intra-individual visual outcomes and patient satisfaction after implantable contact lens (ICL) and Toric ICL implantation. Methods: Twenty-eight eyes of 14 patients were enrolled in this retrospective study. One eye of each patient was assigned to ICL (ICL Group), and the contralateral eye was allocated to Toric ICL (Toric ICL Group). All patients were examined for visual acuity, refraction, intraocular pressure, slit lamp measurements, and satisfaction one week, one month, two months, and six months postoperatively. Results: Mean spherical equivalents of the two groups were corrected from -7.83D (ICL Group) and -5.55D (Toric ICL Group) to 0.13D and 0.20D, respectively, and the mean refractive cylinders were corrected from 0.92D and 2.60D to 0.42D and 0.27D, respectively, at six months postoperatively. The myopias of these two groups and the astigmatism of the Toric ICL group were effectively corrected. The uncorrected visual acuity (UCVA) of the two groups were 1.02 and 1.05, respectively, at six months postoperatively. The safety index, efficacy index, predictability, and stability were favorable. There were no significant differences between the two groups in terms of postoperative UCVA, intraocular pressure(IOP), vaulting, noticeable complications, or patient satisfaction. Conclusions: The results show ICL implantation is effective treatment for high myopia, and Toric ICL implantation is a viable surgical option for the treatment of compound myopia astigmatism. Selection of proper phakic intraocular lens(IOL) is recommended for correcting astigmatism. J Korean Ophthalmol Soc 2010;51(6):802-808
한상엽,김철주 成均館大學校 科學技術硏究所 1988 論文集 Vol.39 No.1
This study is experimental work to investigate characteristics of natural convection flow for a thermoloop room heating system. Focus was given to understand flow regimes and correlation between thermal loads and mass flow rates of working fluid. Followings are some results obtained i) When thermal load varies from one state to another, circulating flow demonstrates very stable transient phenomena, whithout any fluctuations shown in toroidal themo-loop. ii) Mass flow rate increases in accordance with thermal load, but its valve is so low that Reynolds number is less than 400. So, flow regime might be of mixed type of convection, and secondary flows develope all through the pipe. iii) Creveling's correlation of some nondimentional groupes, obtained for toroidal thermo-loop, is shown to be applicable for thermo-loop room heating system.