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Steepest Descent Method에 의한 複合材를 利用한 Multi-ringed Flywheel의 最適設計
洪錫雨 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.2
效果的인 에너지 貯藏裝置인 Flywheel에 單位 體積當 貯藏되는 運動에너지를 最大로 하기 위하여, 應力과 設計變數에 대한 制限條件을 주고 最適設計의 方法을 Steepest Descent Method로 하여 複合材로 製作된 Multi-ringed Flywheel을 最適設計하였으며, 이를 遂行하는 Computational Algorithm을 提示하였다. 數値例로써 Glass/Epoxy 複合材를 선택하였다.
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홍석우 한국도로학회 2012 한국도로학회논문집 Vol.14 No.3
In this study the negative skin friction test of foundation pile was performed in order to monitor the negative skin frictional force acting on the steel pipe pile installed in soft soil. The monitored frictional stresses obtained from the long-term loading test. Through the long-term frictional stress monitoring test, the economical period for the construction of the superstructure was determined. The following conclusion were derived from this study: (1) In soft soil, negative skin friction increases with the increase in the rate of settlement. (2) In the friction relationship graph, the period where there is no frictional strain increase is verified and the time for the construction of the superstructure is determined. (3) The pile loading test was performed and the negative skin friction was compared with the test results. It was determined that the negative skin friction after driving was larger than the negative skin friction obtained from the loading test. 15 days after the construction, the monitored value was similar with the theoretical data. (4) It was determined that even during the occurrence of negative skin friction an economical construction management can be performed using the long-term monitoring method of negative skin friction. 본 연구에서는 교량기초 말뚝의 부주면마찰력 시험을 통하여 연약지반에 타설된 강관말뚝의 부주면마찰력을 측정하였으며장기적인 마찰응력의 관측시험을 통하여 경제적인 상부구조물 시공시기를 판단하였다. 본 연구의 결론은 다음과 같다. (1) 연약지반에서 부마착력의 크기는 침하속도가 클수록 크게 나타났다. (2) 마찰력의 관계 그래프에서 마찰응력의 증감이 없는 시기를확인하여 상부구조물 시공시기를 판단할 수 있었다. (3) 말뚝정재하시험결과와 부주면마찰력 시험결과를 비교해 본 결과 항타직후의 부주면마찰력은 재하시험 시의 마찰응력보다 크게 나오는 것으로 판단되며 15일 경과후의 측정값은 비슷하게 나오는것으로 판단되었고, 이론식에 의한 결과와도 비슷하였다. (4) 부주면마찰력의 장기관측기법을 사용하면 부주면마찰력이 발생하고 있는 중이라도 적절한 상부구조물의 시공시기를 파악할 수 있어 경제적인 시공관리가 가능한 것으로 판단된다.
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난류침투가 사각단면 T분기관 내 누설유동에 의해 발생한 열성층 현상에 미치는 영향
홍석우,최영돈,박민수 대한설비공학회 2003 설비공학 논문집 Vol.15 No.3
In the nuclear power plant, emergency core coolant system (ECCS) is furnished at reactor coolant system (RCS) in order to cool down high temperature water in case of emergency. However, in this coolant system, thermal stratification phenomenon can occur due to coolant leaking in the check valve. The thermal stratification produces excessive thermal stresses at the pipe wall so as to yield thermal fatigue crack (TFC) accident. In the present study, effects of turbulence penetration on the thermal stratification into T-branches with square cross-section in the modeled ECCS are analysed numerically. $textsc{k}$-$\varepsilon$ model is employed to calculate the Reynolds stresses in momentum equations. Results show that the length and strength of thermal stratification are primarily affected by the leak flow rate of coolant and the Reynolds number of the main flow in the duct. Turbulence penetration into the T-branch of ECCS shows two counteracting effects on the thermal stratification. Heat transport by turbulence penetration from the main duct to leaking flow region may enhance thermal stratification while the turbulent diffusion may weaken it.
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신생아 호흡 곤란 증후군에서 CurosurfⓇ와 NewfactanⓇ의 치료 효과 비교
홍석우,이은호,김승연,박호진 대한신생아학회 2008 Neonatal medicine Vol.15 No.2
Purpose : The aim of this study was to compare the clinical effects of modified porcine (CurosurfⓇ) and bovine (NewfactanⓇ) surfactants in the treatment of neonatal respiratory distress syndrome. Methods : Between April 2004 and December 2006, 65 neonates (birth weight ≤2,500 g and gestational age ≤35 weeks) with neonatal respiratory distress syndrome were treated in our neonatal intensive care unit with surfactant. Thirty-one neonates received CurosurfⓇ and 34 neonates received NewfactanⓇ. The neonates were not enrolled if they had major congenital anomalies or meconium aspiration syndrome. We compared the changes in respiratory parameters after surfactant instillation, the incidences of acute and chronic complications, and the mortality between the two treatment groups. Results : Neonatal and maternal demographic characteristics were not different between the groups. The patterns of change in the respiratory parameters after surfactant instillation were not statistically different between the groups. The incidences of surfactant reinstillation and acute complications, such as pneumothorax, patent ductus arteriosus, pulmonary hemorrhage, and grade 3-4 intraventricular hemorrhage, were not different between the neonates who received CurosurfⓇ and the neonates who received NewfactanⓇ. There were no statistically significant differences in the duration of mechanical ventilation, oxygen therapy, hospitalization, prevalence of bronchopulmonary dysplasia, periventricular leukomalacia, retinopathy of prematurity, necrotizing enterocolitis, and mortality between the groups. Conclusion : In the present comparative study, no significant differences in the clinical effects of CurosurfⓇ and NewfactanⓇ were observed.
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홍석우 水原大學校 2015 論文集 Vol.29 No.-
This thesis is to develope eco-friendly block-in block-out processing method of tempered glass for TSP(Touch Screen Panel) of electronic devices such as smart phone and tablet PC. This processing method consists of stacking process, block sawing process, block grinding process, block edge-grinding process and etc. Especially in the stacking process, a paper with hydrophile property covered with water-soluble adhesive is inserted between tempered glasses and uniform spacing and strong adhesive strength between tempered glasses can be obtained. In addition, separation and cleaning process is eco-friendly without water and air pollution.
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