Ubiquitous Displays for Cellular Phone Based Personal Information Environments. - Kiyoharu Aizawa; Kentaro Kakami; Koji Nakahira (IEEE Pacific Rim Conference on Multimedia, 2002)

Automatic Categorization for WWW Images with Applications for Retrieval Navigation. - Koji Nakahira; Satoshi Ueno; Kiyoharu Aizawa (PCM (1), 2004)

Accuracy enhancement of function-oriented web image classification. - Koji Nakahira; Toshihiko Yamasaki; Kiyoharu Aizawa (WWW (Special interest tracks and posters), 2005)

An Analysis of Influence of Emoticons on Affective Impressions Feeling from Tweets. - Koji Nakahira; Tadahiko Kumamoto (iiWAS, 2019)