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Hahm, Doshik,Rhee, Tae Siek,Kim, Hae-Cheol,Park, Jisoo,Kim, Young-Nam,Shin, Hyoung Chul,Lee, SangHoon American Geophysical Union 2014 Journal of geophysical research. Oceans Vol.119 No.5
We observed O2/Ar in the surface waters of the Amundsen Sea, Antarctica, during the austral summers in 2011 and 2012 to investigate the variability of net community production (NCP). Corresponding to the typical peak phytoplankton bloom period, the O2/Ar of the Amundsen Sea Polynya (ASP) reached 30% in early January 2011 and had a strong positive correlation with the sea surface temperature (SST) and chlorophyll-a (Chl-a). In contrast, O2/Ar decreased to -10% in the sea ice zone (SIZ), which was likely associated with either net O2 consumption in the unlit area or the entrainment of deep water containing low dissolved oxygen. Near the terminal stage of the phytoplankton bloom in late February 2012, we observed the same contrasting O2/Ar features between the ASP and SIZ. However, the O2/Ar in the ASP was not >10%, which corresponded with the overall reduction in Chl-a, solar radiation, and SST compared with the corresponding values in 2011. The average net community production in the ASP was 119 +/- 79 mmol O2 m-2 d-1 in January 2011, and 23 +/- 14 mmol O2 m-2 d-1 in February 2012. The strong correlations of NCP with SST and mixed layer depth (MLD) indicate that the ASP phytoplankton bloom is likely initiated by a combination of increased light availability and SST in early summer. Low SST and variable fluorescence to maximum florescence ratio (Fv/Fm) in February indicate that decreased solar radiation and Fe availability are likely responsible for the phytoplankton bloom demise.
고온 및 하중 재하조건을 고려한 콘크리트의 역학적 특성 평가
김규용(Kim Gyu-Yong),이태규(Lee Tae-Gyu),민충식(Min Choong-Siek),이계혁(Lee Kye-Hyouk),남정수(Nam Jeong-Soo),김영선(Kim Young-Sun) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.3
It was experimentally investigated in effects of high temperature and loading condition on the mechanical properties of concrete. This study is aimed to study the effect of elevated temperatures on mechanical properties of concrete according to compressive strength under loading. Tests were conducted on Ø100×200㎜ cylinder specimens, which were tested under both stressed and unstressed conditions by steady-state test. The specimens were under-loaded to 0, 20, 40 percent of their ultimate compressive strength at room temperature and subjected to temperatures ranging from 100 to 700℃, and the residual compressive strength compared to that observed at 20℃. As a result, effect of mechanical properties of concrete at elevated temperature was especially subjected to transient creep more than thermal strain under loading in case of over 500℃.
고온가열에 의한 CFT Stub Column의 역학적 특성평가
김규용(Kim Gyu-Yong),이태규(Lee Tae-Gyu),김영선(Kim Young-Sun),민충식(Min Choong-Siek),강연우(Kang Yeoun-Woo) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
Recently, it increases in use of CFT(Concrete filled steel tube, below CFT) because it an excellent internal force and deformation capacity. But, CFT column lose bearing capacity when steel tube is exposed under fire. In case of the Europe, Japan and America, it have been studied the fire-resistance performance of CFT to use actual specimen. Fire resistance performance of CFT column is determined to internal concrete at fire. Therefore, it is able to evaluate mechanical properties at elevated temperature though specimen reduce the scale. In this study, it is experimentally investigated in effects to use CFT Stub Column at elevated temperature. This study is aimed to study the effect of elevated temperatures ranging from 20 to 700℃ on mechanical properties of concrete according to strength of concrete and fiber mixing. Tests were conducted with □75×75×H200 ㎜ CFT Stub Column and Ø100×200 ㎜ cylinder specimens, which compared to that observed at 20℃. As a result, compressive strength decreased at 100℃, rose again at 200~300℃ and decreased over 300℃. But elastic modulus is decreased continually, and there were deferent as intended compressive strength at elevated temperature. Failure mode shows local buckling at a third of length.
김상준,이영식,이유,김용하,KIM SANG JOON,LEE YOUNG SIEK,YI YU,KIM YOUNG HA 한국천문학회 2000 天文學論叢 Vol.15 No.suppl1
We have presented detected molecules, atoms, radicals, ions, and dimers in the atmospheres of planets and comets from Earth-based and spaceborne observatories during the last 3 decades. We have reviewed spectroscopic studies on the auroral emissions and air glows of the giant planets, and briefly summarized spectroscopic observations of dimers in the atmospheres of the giant planets and Titan. In particular, we highlighted the recent detections of new molecular emissions and absorptions in the spectra of the giant planets, Titan, and recent bright comets from spaceborne or ground-based observatories. We also reviewed current models and theories of the origin and evolution of the solar system, and implications of isotopic ratios in these atmospheres.
고온 및 하중 재하조건을 고려한 콘크리트의 역학적 특성 평가
김규용,이태규,민충식,이계혁,남정수,김영선,Kim, Gyu-Yong,Lee, Tae-Gyu,Min, Choong-Siek,Lee, Kye-Hyouk,Nam, Jeong-Soo,Kim, Young-Sun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3
It was experimentally investigated in effects of high temperature and loading condition on the mechanical properties of concrete. This study is aimed to study the effect of elevated temperatures on mechanical properties of concrete according to compressive strength under loading. Tests were conducted on ${\O}100{\times}200mm$ cylinder specimens, which were tested under both stressed and unstressed conditions by steady-state test. The specimens were under-loaded to 0, 20, 40 percent of their ultimate compressive strength at room temperature and subjected to temperatures ranging from 100 to $700^{\circ}C$, and the residual compressive strength compared to that observed at $20^{\circ}C$. As a result, effect of mechanical properties of concrete at elevated temperature was especially subjected to transient creep more than thermal strain under loading in case of over $500^{\circ}C$.
Da Hye, Kang,Kyu-Yeon, Jung,Jin Pyo, Lee,Chwang Siek, Pak,Young Hwa, Na,Young Joo, Kwon 이화여자대학교 약학연구소 2010 藥學硏究論文集 Vol.- No.20
A series of 3-acetyl-2-aminoquinolin-4-one derivatives selected from the Korean Chemical Bank were screened for calpain inhibitory activity by using a high-throughput fluorimetric calpain assay. We identified a potent and selective mu-calpain inhibitor, compound 17, whose specificity and efficacy for mu-calpain inhibition was better than MDL28170. Docking studies revealed that the efficacy of its inhibitory effect on calpain depended on the size and charge properties of the substitutions on the phenylamino ring.