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- 저자 : 하영철 (검색결과 271 건)
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하영철,최운호 금오공과대학교 2006 論文集 Vol.27 No.-
Net structures are often used for recreational facilities. Such structures are very sensitive to the wind actions, so they have been caused severe damage by strong wind. This paper describe the characteristics of wind force for net structures. Wind tunnel tests were conducted on various wind force models having 5types of solidity ratios, such as 0.25, 0.31, 0.37, 0.42, and 0.45. To verify the results of this test, they are compared to the BSI Code. It is known that the results of this study are similar to the BSI Code. Therefore, the results of this study can be utilized to basic design of net structures.
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하영철,길용식,황성권,김동우 大韓建築學會 2007 大韓建築學會論文集 : 構造系 Vol.22 No.2
<P>This study aims at proposing empirical equations of the across-wind induced response of rectangular tall buildings. In order to estimate empirical formula, wind tunnel tests have been conducted on aero-elastic model of rectangular prisms with various roughness of surface, breadth-to-depth, various terrain categories and side ratios in turbulent boundary layer flows. In this paper, criteria of across-wind induced response is briefly discussed and then these results were mainly analyzed as a function of the side ratios of buildings. Finally, approximate equation for the across-wind induced response(displacement, acceleration and wind load) were proposed as the function of fluctuating overturning moment coefficient and wind force spectral coefficient. Comparison of the across-wind responses determined by the proposed formulas and the results estimated by wind loading code of AIJ-2004 are made to examine the accuracy of the proposed simplified formulas. It is shown from the comparisons that the proposed simplified formulas can be served as an useful tool for the design and analysis of across-wind effects on rectangular tall buildings.</P>
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하영철 한국미생물학회 1988 微生物과 産業 Vol.14 No.3
암모니아를 아질산또는 질산으로 산화시키는 과정인 질화작용(nitrification)은 암모니아와 함께 또 하나의 식물및 미생물에 대한 질소원인 질산의 농도를 증사시켜 생물의 생장을 뒷받침하기도 하나(Fenchel and Blackburn, 1979) 생물체의 질소원에 있어서 세가지의 불이익을 초래하기도 한다. 질산은 암모니아와는 달리 토양이나 저질토(sediment)의 cation exchange site에 흡착되지 않으므로 쉽게 손실된다(Greenland, 1958). 또 무산소상태에서는 탈질화과정 (denitrification)에 의하여 기체질소로 환원되어 생태계내에서 사라진다 (Broadbent and Clark, 1965). 끝으로 질산태의 질소가 생물체내의 질소의 주 형태인 아미노산의 질소로 되기 위해서는 암모니아로 환원되어야 하므로 질산의 동화는 상대적으로 많은 에너지를 필요로한다.
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