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Kengo Fujioka

dblp:82/3058 · DBLP profile ↗
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1ranked-venue papers
1as first author
0since 2021 · last 2008
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Databases, data management, data science and information retrieval · 1 · 1 first-authorApplied, interdisciplinary, general and emerging computing · 1 · 1 first-author

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Databases, data mining, and information retrieval
1 paper
Information retrieval · 67% Indexing and storage engines · 33%

Topics — the 3 heaviest of 3, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Indexing and storage engines
bitmap index
0.112008
Application of bitmap index to information retrieval · WWW 2008
Information retrieval
indexing
0.112008
Application of bitmap index to information retrieval · WWW 2008
Information retrieval › indexing
inverted index
0.112008
Application of bitmap index to information retrieval · WWW 2008

Methods — techniques the papers use, named apart from their topics

hierarchical document-term matrix · 0.1
YearPublicationVenuePosition
2008 Application of bitmap index to information retrieval
abstract
We developed the HS-bitmap index for efficient information retrieval. The HS-bitmap index is a hierarchical document-term matrix: the original document-term matrix is called the leaf matrix and an upper matrix is the summary of its lower matrix. Our experiment results show the HS-bitmap index performs better than the inverted index with a minor space overhead.
Kengo Fujioka, Yukio Uematsu, Makoto Onizuka
WWW1