Moon-Kyum Kim

Two-dimensional seismic response analysis of basin effects

The site effect of local geological conditions on seismic ground motion is of great importance in earthquake engineering. An analytical method is presented herein to study the basin effect for layered soil systems. The method is based on a coupling of the finite element method and the boundary element method. The near field is modeled by the finite elements whereas the far field is modeled by the boundary element formulation using the multi-layer dynamic fundamental solution that satisfies the radiation condition of waves. In order to validate the analytical approach, a one-dimensional problem is modeled and the results are compared with those of a well-known SHAKE code. Two dimensional seismic response analyses are then performed for various ground systems to study the basin effect. Effects of the ground geometry and material contrast on the seismic responses are discussed in some details.

An unusual case of peritoneal dialysis catheter extrusion.

1. Troidle L, Gorban–Brennan n, Kliger A, Finkelstein FO. Continuous peritoneal dialysis–associated peritonitis: a review and current concepts. Semin Dial 2003; 16:428–37. 2. de Freitas DG, Gokal R. Sterile peritonitis in the peritoneal dialysis patient. Perit Dial Int 2005; 25:146–51. 3. Teitelbaum I. Cloudy peritoneal dialysate: it’s not always infection. Contrib Nephrol 2006; 150:187–94. doi:10.3747/pdi.2012.00139

Dynamic Response of Underground Three-layered Pipeline Subjected to Pile Driving Loads : I. Distance

This study presents the behavior characteristics of buried three-layered pipeline subjected to pile driving loads. The analysis considered the driving energy caused by 7 tonf of ram weight and 1.2m of stroke. Also the distance from vibration resource to pipeline varies in 5m to 30m. The vibration velocity and stress are investigated at the center of pipeline in longitudinal direction. In the same cover depth, attenuation ratio of vibration velocity and von Mises stresses for distance increment has shown a decreasing trend. The maximum stress occurs at the top and bottom for the inner pipe, however, an irregular stress distribution is found for the outer pipe.