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RISS 인기검색어
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- 저자 : 이창열(Lee Chang-Ryeol) (검색결과 3 건)
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2 MW급 수상태양광 발전 설비의 전체 모듈 해석을 통한 구조 안전성 평가
이창열(Lee Chang-Ryeol),이권희(Lee Gwon-Hee),심정연(Shim Jeong-Yeon),최대한(Choi Dae-Han),이정호(Lee Jeong-Ho) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.6
Unlike land-based photovoltaic power generation systems, floating photovoltaic power generation systems are installed in a reservoir or marine environment and use a floating body and mooring device. Therefore, it is difficult to evaluate structural safety. To evaluate the structural safety of a floating solar power plant, it is necessary to calculate the wind load and wave load in consideration of the floating body, mooring device, and joint. In this study, analysis was performed on the entire model of a 2 MW class floating photovoltaic power plant. To calculate the applied load, a two-dimensional (2D) flow analysis was performed to calculate the wind load acting on the solar panel. Then, wave analysis, including currents, was performed to calculate the wave load acting on the floating body. Through the analysis, the tension and displacement acting on the mooring device generated by the current, wind load, and wave load were confirmed. Finally, structural analysis was performed on the unit where the wind load, current, wave load, and mooring force acted the most. Thus, the structural safety of the floating photovoltaic power generation facility was evaluated.
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굴패각 및 고로슬래그 산업부산물을 재활용한 콘크리트 투수블록의 제조에 대한 실험적 연구
어석홍 ( Seok-hong Eo ),허원석 ( Won-seok Huh ),하상훈 ( Sang-hoon Ha ),이창열 ( Chang-ryeol Lee ) 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.6
In this paper, bending strength and permeability tests were conducted on concrete permeable blocks manufactured by recycling industrial by-products of oyster shell and blast furnace slag to measure and compare bending strength and permeability coefficient, and present experimental research results. To this end, a total of 54 specimens with a size of 200x200x60mm for surface layer and base layer were manufactured, and bending strength and permeability test were carried ourt accoridng to KS F 4419. Eighteen types of mixing designs were implemented by varying the mixing and replacement rates of oyster shells and blast furnace slag. As a result of the experiment, the higher the mixing ratio of oyster shell, the lower the bending strength and the permeability coefficient. Thereafter, a total of three permeable blocks with dimensions of 200x200x60mm were manufactured and subjected to bending strength and permeability tests according to KS F 4419. As a result of the test, the bending strength satisfies the standard of KS F 4419, and the permeability coefficient is 12 times higher than the standard of KS F 4419. It seems that the proper mixing of oyster shells and blast furnace slag increases the amount of air, and further research on durability and economic feasibility of materials used to manufacture permeable blocks is required.
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토끼에서 간 허혈과 재관류시 Glutathione 과 Prostaglandin E1 이 간기능 회복에 미치는 영향
이정현,정찬종,김중래,신치만,김호근,이창열 대한마취과학회 1995 Korean Journal of Anesthesiology Vol.28 No.6
The interruption of hepatic blood flow has been adopted as a method of bleeding control in hepatectomy and liver transplantation. But this occlusion of hepatic inflow may result in significant hepatic injury by various kinds of oxygen radicals produced as a result of hepatic ischemia and following reperfusion. Arterial ketone body ratio(AKBR) is adequatc and convenient parameter by which both acute and prolonged changes of the hepatic function can be estimated. Pharmacological modulation of hepatic injury during warm ischemia and early reperfusion has shown some benefical effects. The authors conducted an experiment to evaluate the inhibitory effect of glutathione and prostaglandin E on hepatic injury due to acute hepatic ischemia and reperfusion. Thirty rabbits were divided into three groups, such as control(n=10), GSH(n=10) and PGE(n=10) groups. Acute hepatic ischemia was induced through the application of portal triad cross-clamping for 30 minutes, and thereafter hepatic reperfusion was induced with the removal of cross-clamping. A single bolus of 200 mg glutathione was injected 10 min before clamp in GSH group, and 200 ng/kg/min of PGE continuously from 10 min before clamp to 30 min after declamp in PGE group. AKBR and hepatic histological findings hefore clamp, 30 min after clamp, 5 min and 30 min after declamp, respectively were compared among 3 groups AKBR was markedly decreased during the clamping period in all groups (P$lt;0.05). In control and PGE groups AKRR was significantly increased after reperfusion than before clamp (P$lt;0.05), but was significantly lower than before clamp. Thirty minutes after reperfusion in GSH group AKBR returned to normal level and was significantly higher than in control group (P$lt;0.05). On light tnicroscopic examination of liver biopsy, mild swollen hepatocytes in the centrilobular zone were seen at ischemia and reperfusion in control and GSH groups, but nearly normal hepatic architectures in PGE group. These results suggest that glutathione has some benefical effect on protection of hepatic dysfunction, and PGE1 on protection of hepatocellular injury during hepatic ischemia and reperfusion.
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