While search engines have become vital tools for searching information on the Internet,
privacy issues remain a growing concern due to the technological abilities of search engines …

We propose methods for generating diversified rankings of subtopics of keyword queries.
Our methods are characterized by their awareness of hierarchical heading structure in …

Privacy remains a major concern when using search engines to find for information on the
web due to the fact that search engines own massive resources in preserving search logs of …

We propose methods for ranking subtopics of a keyword query. Subtopics are also keyword
queries which specialize and/or disambiguate search intent behind their original query …

Authors write headings for splitting a document into multiple semantic blocks of different
topics. A block may include some other blocks, and the blocks in a document compose …

本論文では, 文書集合から必要な文書を検索する際に, 各文書内に現れる, 見出し付きブロック群が
成す階層構造の情報を用いて, 検索精度の向上と検索作業の効率化を実現する技術について論じる …