J-GLOBAL         Last updated: Aug 6, 2019 at 10:29
National Institute of Informatics
Digital Content and Media Sciences Research Division
Job title
Dr. Eng.
Other affiliation
Graduate School of Information Science and TechnologyThe University of TokyoThe Department of InformaticsThe Graduate University for Advanced Studies


National Institute of Informatics. Research group on text media and content.
Back in the university, belonged to Electrical Engineering department and engaged in a research on formal specification and verification techniques for communication software. After the graduation of the PhD course, spent two years at University of Illinois at Urbana-Champaign as a visiting researcher, started working in knowledge engineering research field. Following several years, engaged in researches in soft optimization methods including genetic algorithms (GA). Inspired by the similarity between genes in GA and words in natural languages, current research goal is to pursue both the statistical and semantic nature of information transferred over text-based media. Now is working on such topics as information retrieval, natural language processing, web information analysis.

Research Areas


Academic & Professional Experience

Jul 2018
Professor, School of Multidisciplinary Sciences, Department of Informatics, SOKENDAI (The Graduate University for Advanced Studies)
Apr 2008
Professor, concurrent, Department of Computer Science, Graduate School of Information Science and Technology, The University of Tokyo
Jul 2003
Professor, Digital Content and Media Sciences Research Division, National Institute of Informatics
Oct 2008
Jun 2018
Visiting Professor, School of Multidisciplinary Sciences,Department of Informatics, SOKENDAI (The Graduate University for Advanced Studies)
Apr 1995
Mar 2000
Associate Professor, National Institute of Science Information Systems (NACSIS)
Apr 1990
May 1995
Research Assistant, National Center for Science Information Systems (NACSIS)

Awards & Honors

Feb 2013
"Extraction of Semantic Relationships from Academic Papers using Syntactic Patterns", Best Paper Award, IARIA The Fifth International Conference on Information, Process, and Knowledge Management (eKNOW 2013)
Winner: Akihiro Kameda, Kiyoko Uchiyama, Hideaki Takeda, Akiko Aizawa

Published Papers

Akiko Aizawa
IPSJ Journal   52(10) 2953-2964   Oct 2011   [Refereed]
In this paper, we first present an overview of recent studies on compression and encoding-based similarity measures for textual documents. Next, we propose a new method that combines Ziv-Merhav crossparsing and a naive Bayes classifier. Then, we i...
Akiko Aizawa, Atsuhiro Takasu, Daiji Fukagawa, Masao Takaku, Jun Adachi
Progress in Informatics   (6) 41-47   Mar 2009   [Refereed]
Multi-class named entity recognition via bootstrapping with dependency tree-based patterns
Van B. Dang and Akiko Aizawa
Proceedings of the 12nd Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD 2008)      May 2008   [Refereed]
Akiko Aizawa and Keizo Oyama
Proceedings of the International Workshop on Challenges in Web Information Retrieval and Integration (WIRI2005)   31-40   Apr 2005   [Refereed]
Analysis of Source Identified Text Corpora: Exploring the Statistics of the Reused Text and Authorship
Akiko Aizawa
Proceedings of the 41st Annual Meeting of the Association for Computational Linguistics (ACL-03)   383-390   Jul 2003   [Refereed]
Akiko Aizawa
Information Processing & Management   39(1) 45-65   Jan 2003   [Refereed]
A Method of Cluster-Based Indexing of Textual Data
Akiko Aizawa
Proceedings of the 19th International Conference on Computational Linguistics (COLING 2002)   1-7   Aug 2002   [Refereed]
An Approach to Microscopic Clustering of Terms and Documents
Akiko Aizawa
PRICAI 2002: Trends in Artifitial Intelligence, Proceedings of the 7th Pacific Rim International Conference on Artificial Intelligence, Mitsuru Ishizuka, Abdul Satter (Eds), LNAI2417   404-413   Jul 2002   [Refereed]
Akiko Aizawa
Proceedings of the IEEE 2002 Congress on Evolutionary Computation (CEC2002)   1787-1792   May 2002   [Refereed]
The Feature Quantity: An Information Theoretic Perspective of Tfidf-like Measures
Akiko Aizawa
Proceedings of the 23th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2000)   104-111   Jan 2000   [Refereed]
Scheduling of Genetic Algorithms in a Noisy Environment
Akiko N.Aizawa and Benjamin W.Wah
Evolutionary Computation   2(2) 97-122   Jan 1994   [Refereed]

Books etc

Advances in Evolutionary Computing
Ashish Ghosh and Shigeyoshi Tsutsui Eds.
Springer   Feb 2003   
Akiko Aizawa: "Designed Sampling with Crossover Operators", 413--439 (Chapter 16)
Recent Advances in Computational Terminology
edited by Bouligault, D., Jacquemin, C. and l'Homme, M-C.
John Benjamins   May 2001   
Aizawa, Akiko and Kageura, Kyo: An Approach to the Automatic Generation of Multilingual Keyword Clusters. p.1-27.
Foundations of Genetic Algorithms・4
edited by Belew,R.K. and Vose,M.D.
Morgan Kaufman, 463p.   Sep 1997   ISBN:1-55860-460-x
Akiko Aizawa, "Fitness Landscape Characterization by Variance of Decompositions," p.225-245

Teaching Experience