A Web Page Scoring Method for Local Web Search Engines. - Yohei Ikawa; Kunihiko Sadakane (DASFAA, 2004)

Detecting Invalid Dictionary Entries for Biomedical Text Mining. - Hironori Takeuchi; Issei Yoshida; Yohei Ikawa; Kazuo Iida; Yoko Fukui (KDLL, 2006)

A New Document Masking Approach for Removing Confidential Information. - Yohei Ikawa; Hiroshi Kanayama (CEC/EEE, 2007)

User community reconstruction using sampled microblogging data. - Miki Enoki; Yohei Ikawa; Rudy Raymond (WWW (Companion Volume), 2012)

Location inference using microblog messages. - Yohei Ikawa; Miki Enoki; Michiaki Tatsubori (WWW (Companion Volume), 2012)

Location-based insights from the social web. - Yohei Ikawa; Maja Vukovic; Jakob Rogstadius; Akiko Murakami (WWW (Companion Volume), 2013)

Online User Location Inference Exploiting Spatiotemporal Correlations in Social Streams. - Yuto Yamaguchi; Toshiyuki Amagasa; Hiroyuki Kitagawa; Yohei Ikawa (CIKM, 2014)