Research Areas      We are simulating large-scale structures of the universe using the NCAP code, a more improved verion of the previous GOTPM. The research interests spam from the large-scale structures to individual halos/subhalos to provide a testbed for the comparison with observations, for examples, the Sloan Digital Sky Survey and 2dF Galaxy Redshift survey. To identify dark matter halos from simulation particles, we developed a new halo finding method, the Physically Self Bound (PSB) which adopts the total energy and tidal boundary criteria to delineate halo/subhalo regions even in crowded environments.      Up to now, We have succeded three 2048^3 particle simulations with various box sizes from super-Hubble volume to SDSS volume occupied by typical L* galaxies. Using these simulation data we have compared the topology of mock and galaxy distributions and have analyzed the environmental effect on galaxy physical quantities. And many auxiliary small-size simulations have been frequently made for various specific purposes from time to time. Research Facilities      QUEST: a Beowulf-type linux cluster with 64 nodes (256 cores of AMD CPUs) + 1024 GB mem. + 20 TB disk      Myrinet: a Giga-bit device for data communication      OpenPBS: a parallel job management tool      Software: MPICH, Portland Group Compiler, and, IDL Research Members      Changbom Park, Professor      Juhan Kim, Postdoc      Do-Gyun Kim, Graduate Student Research Activities      Now all members in this research field at KIAS are currently working with the SDSS data. Professor Park is investigating the environmental effect on the galaxy properties, Mr. Do-Gyun Kim is working on the merging events and properties using close binary pairs of galaxies, and Dr. Kim is making mock galaxies and comparing their physical distributions with those of SDSS galaxies.      All members are currently involved in the development of the next-generation hydro code aimed by the "Computational Astrophysics Group". Pictures & Movie Files      Under construction. Papers & Press Release      Preprints Archive      Press Release (Korean)

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