1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540
2. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
3. Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea
4. National Fusion Research Institute, Daejeon 34133, Korea
5. Energy Sciences Network, Lawrence Berkeley National Laboratory, Berkeley, California 94720
6. KREONET Operation and Service, Korea Institute of Science and Technology Information, Daejeon 305806, Korea