Search

Your search keyword '"Kwak, D. Y."' showing total 21 results
Start Over Author "Kwak, D. Y."
21 results on '"Kwak, D. Y."'

1. Extraction method for Stokes Flow with jumps in the pressure

Author

Chang, K. S. and Kwak, D. Y.

Subjects
Mathematics - Numerical Analysis, 65Z05, 76D07
Abstract

In this paper, we consider a stationary, constant viscosity, incompressible Stokes flow with singular forces along one or several interfaces. Assuming only the jumps of the pressure are present along the interface, we develop a new numerical scheme for such a problem. By constructing an approximate singular function and removing it, we can apply a standard finite element method to solve it. A main advantage of our scheme is that one can use a uniform grid. We observe optimal $O(h)$ order for the pressure and $O(h^2)$ order for the velocity.

Published
2009

5. Quality control for next-generation liquefaction case histories

Author

Paolo Zimmaro, Brandenberg, S. J., Bozorgnia, Y., Stewart, J. P., Kwak, D. Y., Cetin, K. O., Can, G., Ilgac, M., Franke, K. W., Moss, R. E. S., Kramer, S. L., Stamatakos, J., Juckett, M., Weaver, T., Silvestri, Francesco, and Moraci, Nicola

Subjects
liquefaction, relational database
Abstract

The Next-Generation Liquefaction (NGL) database is an open-source, global database of liquefaction and non-ground failure case-histories. The database is part of a multi-year research effort with the main goal of developing improved procedures to evaluate liquefaction susceptibility, triggering, and consequences. In NGL, a case-history is defined as the intersection of three components: (1) a site, (2) an earthquake event, and (3) post-earth-quake observations. The NGL database hosts case-histories used to develop existing liquefaction models, as well as new data derived from recent earthquakes such as the 2010-2011 Canterbury earthquake sequence, the 2011 Tohoku-Oki earthquake, and the 2012 Emilia earthquake. The database also hosts lateral spread case-histories, and a substantial number of liquefaction sites characterized by the presence of co-located recording stations. All of the data present in the NGL database are reviewed by the NGL Database Working Group. The NGL formal vetting process is described for an example case-history.

Published
2019

18. Nga-subduction research program

Author

Bozorgnia, Y., Tadahiro Kishida, Abrahamson, N. A., Ahdi, S. K., Ancheta, T. D., Archuleta, R. J., Atkinson, G., Boore, D. M., Campbell, K. W., Chiou, B., Contreras, V., Darragh, R., Gregor, N., Gulerce, Z., Idriss, I. M., Ji, C., Kamai, R., Kuehn, N., Kwak, D. Y., Kwok, A., Lin, P. -S, Magistrale, H., Mazzoni, S., Muin, S., Midorikawa, S., Parker, G., Si, H., Silva, W. J., Stewart, J. P., Walling, M., Wooddell, K. E., and Youngs, R. R.

19. NGA-SUB GROUND MOTION DATABASE

Author

Kishida, T., Victor Contreras, Bozorgnia, Y., Abrahamson, N. A., Ahdi, S. K., Ancheta, T. D., Boore, D. M., Campbell, K. W., Chiou, B., Darragh, R., Gregor, N., Kuehn, N., Kwak, D. Y., Kwok, A. O., Lin, P., Magistrale, H., Mazzoni, S., Muin, S., Midorikawa, S., Si, H., Silva, W. J., Stewart, J. P., Wooddell, K. E., and Youngs, R. R.

Abstract

This paper summarizes a ground-motion database developed for the NGA-Sub Project. The database consists of two- A nd three-component ground-motion recordings from selected earthquakes in subduction zones. The database also includes the supporting data such as source, path, and site metadata. The earthquakes are located in Japan, Taiwan, the Pacific Northwest region of North America, Alaska, Mexico, Central and South America, and New Zealand. The events in the database are classified as interface, intraslab, or outer-rise, and have magnitudes ranging from 4 to 9. The database includes more than 71,000 three-component recordings, most of which are from digital accelerograms. The database includes PGA, PGV, pseudo-spectral acceleration for eleven damping values between 0.5% and 30%, Fourier amplitude spectra for frequencies from 0.1 to 100 Hz, and significant-shaking durations based on Arias Intensity. These data are analyzed in the project to model various ground-motion properties.

Catalog

Books, media, physical & digital resources
See catalog results