japanese-katakana-region
japanese-katakana-region is an interactive autoloaded Lisp function in `japan-util.el
'.
(japanese-katakana-region FROM TO &optional HANKAKU)
Convert Japanese `hiragana' chars in the region to `katakana' chars.
Optional argument HANKAKU t means to convert to `hankaku katakana' character
of which charset is `japanese-jisx0201-kana'.