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K.M. Lam,A.P. To 한국풍공학회 2006 Wind and Structures, An International Journal (WAS Vol.9 No.6
This paper presents numerical results of pedestrian-level wind environment around the base of a row of tall buildings by CFD. Four configurations of building arrangement are computed including a single square tall building. Computed results of pedestrian-level wind flow patterns and wind speeds are compared to previous wind tunnel measurement data to enable an assessment of CFD predictions. The CFD model uses the finite-volume method with RNG k-e model for turbulence closure. It is found that the numerical results can reproduce key features of pedestrian-level wind environment such as corner streams around corners of upwind building, sheltered zones behind buildings and channeled high-speed flow through a building gap. However, there are some differences between CFD results and wind tunnel data in the wind speed distribution and locations of highest wind speeds inside the corner streams. In locations of high ground-level wind speeds, CFD values match wind tunnel data within 10%.
Cheymol, A.,Gonzalez Sotelino, L.,Lam, K. S.,Kim, J.,Fioletov, V.,Siani, A. M.,De Backer, H. Copernicus GmbH 2009 Atmospheric chemistry and physics Vol.9 No.2
<P>Abstract. The Langley plot method applied on the Brewer Ozone measurements can provide accurate Aerosol Optical Depth (AOD) in the UV-B. We present seven intercomparisons between AOD retrieved from Brewer Ozone measurements at 320 nm and AOD measured by CIMEL sunphotometer at 340 nm or 440 nm (shifted to 320 nm in using the Angström's law), which are stored in the international AERONET database. Only the intercomparisons between co-located instruments can be used to validate the Langley Plot Method applied to the Brewer measurements: in this case, all the correlation coefficients are above 0.82. If the instruments are not at the same site, the correlation between the AOD retrieved by both instruments is much lower. In applying the Angström's law the intercomparison is improved compared to previous study. </P>
Lam, K.M.,To, A.P. Techno-Press 2006 Wind and Structures, An International Journal (WAS Vol.9 No.6
This paper presents numerical results of pedestrian-level wind environment around the base of a row of tall buildings by CFD. Four configurations of building arrangement are computed including a single square tall building. Computed results of pedestrian-level wind flow patterns and wind speeds are compared to previous wind tunnel measurement data to enable an assessment of CFD predictions. The CFD model uses the finite-volume method with RNG $k-{\varepsilon}$ model for turbulence closure. It is found that the numerical results can reproduce key features of pedestrian-level wind environment such as corner streams around corners of upwind building, sheltered zones behind buildings and channeled high-speed flow through a building gap. However, there are some differences between CFD results and wind tunnel data in the wind speed distribution and locations of highest wind speeds inside the corner streams. In locations of high ground-level wind speeds, CFD values match wind tunnel data within ${\pm}10%$.
J.Y.K. Lam,J.C.M. Ho,A.K.H. Kwan 사단법인 한국계산역학회 2009 Computers and Concrete, An International Journal Vol.6 No.5
In the design of concrete columns, it is important to provide some nominal flexural ductility even for structures not subjected to earthquake attack. Currently, the nominal flexural ductility is provided by imposing empirical deemed-to-satisfy rules, which limit the minimum size and maximum spacing of the confining reinforcement. However, these existing empirical rules have the major shortcoming that the actual level of flexural ductility provided is not consistent, being generally lower at higher concrete strength or higher axial load level. Hence, for high-strength concrete columns subjected to high axial loads, these existing rules are unsafe. Herein, the combined effects of concrete strength, axial load level, confining pressure and longitudinal steel ratio on the flexural ductility are evaluated using nonlinear moment-curvature analysis. Based on the numerical results, a new design method that provides a consistent level of nominal flexural ductility by imposing an upper limit to the axial load level or a lower limit to the confining pressure is developed. Lastly, two formulas and one design chart for direct evaluation of the maximum axial load level and minimum confining pressure are produced.
Tang, W.K.,Wong, K.B.,Lam, Y.M.,Cha, S.S.,Cheng, C.H.K.,Fong, W.P. North-Holland Pub ; Elsevier Science Ltd 2008 FEBS letters Vol.582 No.20
The crystal structure of seabream antiquitin in complex with the cofactor NAD<SUP>+</SUP> was solved at 2.8A resolution. The mouth of the substrate-binding pocket is guarded by two conserved residues, Glu120 and Arg300. To test the role of these two residues, we have prepared the two mutants E120A and R300A. Our model and kinetics data suggest that antiquitin's specificity towards the substrate α-aminoadipic semialdehyde is contributed mainly by Glu120 which interacts with the α-amino group of the substrate. On the other hand, Arg300 does not have any specific interaction with the α-carboxylate group of the substrate, but is important in maintaining the active site conformation.
Bioconcentration of Perfluorinated Compounds in Freshwater Fish in Korea Rivers
N. H. Lam,C. R. Cho,M. S. Chang,B. K. Min,H. S Cho 해양환경안전학회 2012 해양환경안전학회 학술발표대회 논문집 Vol.2012 No.11
Water, plankton, blood and liver of crucian carp (Carassius auratus) and mandarin fish (Siniperca cherzeri) samples from 5 freshwater ecosystems in 3 major rivers of Korea including Nam Han River, Nakdong River and Yeongsan River were collected.