CaltechAUTHORS: Book Chapter
https://feeds.library.caltech.edu/people/Ji-Chen/book_section.rss
A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenTue, 05 Nov 2024 19:06:40 -0800A 14.6 billion degrees of freedom, 5 teraflops, 2.5 terabyte earthquake simulation on the Earth Simulator
https://resolver.caltech.edu/CaltechAUTHORS:20161121-152257956
Year: 2003
DOI: 10.1145/1048935.1050155
We use 1944 processors of the Earth Simulator to model seismic wave propagation resulting from large earthquakes. Simulations are conducted based upon the spectral-element method, a high-degree finite-element technique with an exactly diagonal mass matrix. We use a very large mesh with 5.5 billion grid points (14.6 billion degrees of freedom). We include the full complexity of the Earth, i.e., a three-dimensional wave-speed and density structure, a 3-D crustal model, ellipticity as well as topography and bathymetry. A total of 2.5 terabytes of memory is needed. Our implementation is purely based upon MPI, with loop vectorization on each processor. We obtain an excellent vectorization ratio of 99.3%, and we reach a performance of 5 teraflops (30% of the peak performance) on 38% of the machine. The very high resolution of the mesh allows us to perform fully three-dimensional calculations at seismic periods as low as 5 seconds.https://resolver.caltech.edu/CaltechAUTHORS:20161121-152257956Monolithically Integratable Colliding Pulse Modelocked Laser Source for O-CDMA Photonic Chip Development
https://resolver.caltech.edu/CaltechAUTHORS:20190304-092904509
Year: 2008
DOI: 10.1109/ofc.2008.4528201
We demonstrate modelocking of a colliding-pulse mode-locked laser formed by 3-μm-deep etched-mirrors on an InP platform for integration with passive waveguide components. Timing jitter of 243 fs and pulse width of 10 ps were measured.https://resolver.caltech.edu/CaltechAUTHORS:20190304-092904509