Taketoshi Hibiya: Professor, Tokyo Metropolitan Institute of Technology
Kazuhiko Kuribayashi: Professor, ISAS/JAXA
Kosuke Nagashio: Research Associate, ISAS/JAXA

TMIT: Tokyo Metropolitan Institute of Technology
ISAS: Institute of Space and Astronautical Science, JAXA
UF: University of Florida (Home of Gators!)

PEC: Beautiful background images are provided by Japanese photographer PEC.
Stephen N. Fisher: Left photo "Tower of light" is by Stephen N. Fisher.
Aaron J. heiner: My pen friend.
Stefan Siep: An astrophotographer creating 'pretty pictures' and cool site.

Nara: Japan-guide
World Soft Tennis Information: My favorite sport
Kojika: Chuo university soft tennis team.
INAGI Jr.: Soft tennis jr. club team.