MWMD: A Module-Based Workbench for Multimedia Database Programmers and Users. - Yoshihiko Ichikawa; Chiemi Watanabe; Noriko Ukai; Rika Furuhata (FODO, 1998)

Toward a 3D Moving Object Data Model - A Preliminary Consideration. - Yoshifumi Masunaga; Noriko Ukai (DANTE, 1999)