Organization of NTCIR-15 Conference Organizing Committee General Co-Chairs

Charles L. A. Clarke University of Waterloo, Canada Noriko Kando National Institute of Informatics, Japan

Local Arrangement Chair

Madoka Ishioroshi National Institute of Informatics, Japan

Local Arrangements

Sumika Masui National Institute of Informatics, Japan Tomoko Ohsuga National Institute of Informatics, Japan Yuko Tanaka National Institute of Informatics, Japan

Organizing Committee Co-Chairs

Makoto P. Kato University of , Japan Hiroaki Ohshima University of Hyogo, Japan

Organizing Committee

Emi Ishita , Japan Yoshiyuki Shoji , Japan Masao Takaku University of Tsukuba, Japan Takehiro Yamamoto University of Hyogo, Japan Masaharu Yoshioka , Japan

Social Platform Chair

Tomoko Ohsuga National Institute of Informatics, Japan Hideyuki Shibuki National Institute of Informatics, Japan

Publication Co-Chairs

Makoto P. Kato University of Tsukuba, Japan Yiqun Liu , China

Publicity Chair Hideyuki Shibuki National Institute of Informatics, Japan

Program Committee

Program Committee Co-Chairs

Noriko Kando National Institute of Informatics, Japan Makoto P. Kato University of Tsukuba, Japan Yiqun Liu Tsinghua University, China

Ben Carterette Spotify, USA Hsin-Hsi Chen National Taiwan University, Taiwan Nicola Ferro University of Padova, Italy Gareth Jones Dublin City University, Ireland Diane Kelly University of Tennessee, USA Douglas Oard University of Maryland, USA Maarten de Rijke University of Amsterdam, the Netherlands Tetsuya Sakai , Japan Mark Sanderson RMIT University, Australia Ian Soboroff NIST, USA

Task Planning and Organizing Committee (Names in alphabetical order of family names. The asterisks (*) refer to the task leaders.)

Dialogue Evaluation (“DialEval-1”)

Inho Kang Naver Corporation, Korea Sosuke Kato Waseda University, Japan Tetsuya Sakai (*) Waseda University, Japan Zhaohao Zeng Waseda University, Japan

Numeral Attachment in Financial Tweets(“FinNum-2”)

Hsin-Hsi Chen (*) National Taiwan University, Taiwan Chung-Chi Chen (*) National Taiwan University, Taiwan Hen-Hsen Huang National Chengchi University, Taiwan Hiroya Takamura Institute of Technology, Japan

Question Answering Lab for Political Information (“QA Lab-PoliInfo-2”)

Tomoyoshi Akiba Toyohashi University of Technology, Japan Madoka Ishioroshi National Institute of Informatics, Japan Yasutomo Kimura (*) Otaru University of Commerce, Japan Teruko Mitamura Carnegie Mellon University, USA Yasuhiro Ogawa , Japan Hokuto Ototake Fukuoka University, Japan Minoru Sasaki , Japan Hideyuki Shibuki (*) Yokohama , Japan Keiichi Takamaru Utsunomiya Kyowa University, Japan Yuzu Uchida Hokkai-Gakuen University, Japan Masaharu Yoshioka Hokkaido University, Japan

SHINRA 2020 Multi-lingual(“SHINRA2020-ML”)

Koji Matsuda Riken, AIP/ , Japan Kouta Nakayama University of Tsukuba/ Riken AIP, Japan Masako Nomoto Riken, AIP, Japan Satoshi Sekine (*) Riken, AIP, Japan Asuka Sumida Riken, AIP, Japan

We Want Web with CENTRE (“WWW-3”)

Zhumin Chu Tsinghua University, China Zhicheng Dou Renmin University of China, China Nicola Ferro University of Padua, Italy Yiqun Liu Tsinghua University, China Maria Maistro University of Copenhagen, Denmark Jiaxin Mao Tsinghua University, China Tetsuya Sakai (*) Waseda University, Japan Ian Soboroff NIST, USA Sijie Tao Waseda University, Japan Zhaohao Zeng Waseda University, Japan Yukun Zheng Tsinghua University, China

Data Search (“Data Search”)

Hsin-Liang Chen Missouri University of Science and Technology, USA Makoto P. Kato (*) University of Tsukuba, Japan Ying-Hsang Liu University of Southern Denmark, Denmark Hiroaki Ohshima University of Hyogo, Japan

Micro Activity Retrieval Task (“MART”)

Cathal Gurrin Dublin City University, Ireland Graham Healy Dublin City University, Ireland Frank Hopfgartner The University of Sheffield, United Kingdom Hideo Joho University of Tsukuba, Japan

Secretariat Sumika Masui National Institute of Informatics, Japan Yuko Tanaka National Institute of Informatics, Japan