Takayuki Yumoto   Takahiro Yamanaka   Manabu Nii   Naotake Kamiura   
DIGITAL LIBRARIES: KNOWLEDGE, INFORMATION, AND DATA IN AN OPEN ACCESS SOCIETY 10075 85-91 2016年 [査読有り]
We propose rarity-oriented retrieval methods for serendipity using two approaches. We define rare information as relevant and atypical information. We propose two approaches. In the first approach, we use social bookmark data. We introduce tag est...
Proceedings of the 11th NTCIR Conference on Evaluation of Information Access Technologies, NTCIR-11, National Center of Sciences, Tokyo, Japan, December 9-12, 2014 2014年 [査読有り]
Takayuki Yumoto   Ryohei Tada   Manabu Nii   Kunihiro Sato   
2013 SECOND IIAI INTERNATIONAL CONFERENCE ON ADVANCED APPLIED INFORMATICS (IIAI-AAI 2013) 284-288 2013年 [査読有り]
In this paper, we propose rarity of a Web page in a category given by a user to find useful information that a few people know. A rare Web page is a page that belongs to a given category and that is atypical in the category. We define a probabilit...
WEB INFORMATION SYSTEMS AND MINING, PT II 6988 103-+ 2011年 [査読有り]
Conventional search engines are able to extract commonplace information by incorporating users requests into their queries. Users perform niche requests when they want to obtain atypical objects or unique information. In these instances, it is dif...