A high performance computing cluster for astronomical computations has been built at Korea Astronomy Observatory. The 64 node cluster interconnected with Gigabit Ethernet is composed of 128 Intel Xeon processors, 160 GB memory, 6 TB global storage space, and an LTO (Linear Tape-Open) tape library. The cluster was installed and has been managed with the Open Source Cluster Application Resource (OSCAR) framework. Its performance for parallel computations was measured with a three-dimensional hydrodynamic code and showed quite a good scalability as the number of computational cells increases. The cluster has already been utilized for several computational research projects, some of which resulted in a few publications, even though its full operation time is less than one year. As a major resource of the K∗Grid testbed, the cluster has been used for Grid computations, too.

• 강영운(Astrophysical Research Center of the Structure and Evolution of the Cosmos, Department of Astronomy and Space Science, Sejong University) | YOUNG WOON KANG
• 류동수(Department of Astronomy and Space Science, Chungnam National University) | DONGSU RYU
• 남현웅(한국천문연구원) | HYUNWOONG NAM (Korea Astronomy Observatory)
• 백창현(한국천문연구원, 부산대학교 지구과학교육과) | CHANG HYUN BAEK (Korea Astronomy Observatory, Department of Earth Science, Pusan National University)
• 임인성(한국천문연구원) | IN SUNG YIM (Korea Astronomy Observatory)
• 김봉규(한국천문연구원) | BONG GYU KIM (Korea Astronomy Observatory)
• 김종수(한국천문연구원) | JONGSOO KIM (Korea Astronomy Observatory)