Mamoru Komachi

Associate Professor
Faculty of System Design
Tokyo Metropolitan University
6-6 Asahigaoka, Hino, Tokyo 191-0065, Japan

Research Interests

Current projects include large-scale natural language processing using the web, especially in the field of semantics analysis and information extraction. I am working on large corpora to extract semantic knowledge with minimal human annotation cost.

I am also interested in statistical machine translation (SMT). We are working on incorporating syntactic and semantic information to SMT framework.


Ph.D., March 2010 (Best Student Award)
Graduate School of Information Science, Nara Institute of Science and Technology
Dissertation title: Graph-Theoretic Approaches to Minimally-Supervised Natural Language Learning
Supervisor: Professor, Yuji Matsumoto
M.E., March 2007 (Best Student Award)
Graduate School of Information Science, Nara Institute of Science and Technology
Thesis title: Argument Structure Analysis of Event Nouns Based on Noun-verb Co-occurences and Noun Phrase Patterns
Supervisor: Professor, Yuji Matsumoto
B.A., March 2005
College of Arts and Sciences, University of Tokyo, Komaba
Thesis title: The Language Policy in Colonial Taiwan (in Japanese)
Thesis advisor: Associate Professor, Takuji Okamoto

Professional Experience

April 2013-present
Associate Professor
Tokyo Metropolitan University, Japan
I am working as a primary investigator for a natural language processing lab.
April 2010-March 2013
Assistant Professor
Nara Institute of Science and Technology, Japan
I worked on various kinds of natural language processing tasks and data mining tasks.
May 2010-September 2011
Software Engineer
Apple Japan, Inc.
I worked as a rsearch consultant for natural language processing.

(Professional experience prior to 2010)

Conference Papers (Refereed)

Conference Papers (Others)



April 2016-March 2017 JPY 2.5M
Microsoft Research CORE Project. "Neural Network for Robust Japanese Word Segmentation"
April 2016-March 2019 JPY 3.1M
JSPS Grant-in-Aid for Young Scientists (B), "Error-Correction Using Robust Word Representation Learning and Deep Neural Networks"
April 2011-March 2014 JPY 2.5M
SCAT Research Grant, "Robust Japanese Predicate Argument Structure Analysis for Large-scale Information Extraction"
April 2012-March 2013 JPY 2.0M
Microsoft Research CORE Project, "Learning L1-aware Error Models from the Web"
April 2011-March 2013 JPY 2.7M
JSPS Grant-in-Aid for Young Scientists (B), "Large-scale Parallel Processing for Global Optimization in Natural Language Processing"
April 2008-March 2010 JPY 1.0M
Japan Society for the Promotion of Science (JSPS) Research Fellowship for Young Scientists, "Exploiting Large Corpora for Learning-based Argument Structure Analysis of Noun Phrases"
October 2007-March 2008 JPY 1.25M
Creative and International Competitiveness Project Leader, "Robust Statistical Japanese IME with Unknown Word Processing Using Large Corpus", Nara Institute of Science and Technology.


April 2011-March 2014
MEXT Grant-in-Aid for Scientific Research (A), "Joint Approach to Natural Language Processing Using Global Information"
November 2011-September 2013
National Institute for Japanese Language, "Statistical and Machine Learning-based Approaches to History of the Japanese Language Research"
July 2012-March 2013
MEXT Grant-in-Aid for Scientific Research (A), "Simuntaneous Speech Translation for Foreign News and Talk"
Summer 2010-March 2011
MEXT Grant-in-Aid for Scientific Research in Priority Areas, "Japanese Corpus: Automatic Labeling of the Balanced Corpus of Contemporary Written Japanese (BCCWJ)"
July 2005-March 2006
Tomoya Yoshizawa, Keita Oda, Takashi Asari, Yasushi Hikida, Shinra Aida, Tomoaki Okayama, Hiroyuki Onoda, Motoi Washida and Mamoru Komachi: "User-Oriented Package Management System", Exploratory Software Project (Exploratory Youth Program), Information-Technology Promotion Agency, Japan.

Honors and Awards

July 2014
The 20th Anniversary Best Paper Award, The Association for Natural Language Processing. "Annotating Predicate-Argument Relations and Anaphoric Relations: Findings from the Buidling of the NAIST Text Corpus"
May 2011
JSAI Best Paper Award, The Japanese Society for Artificial Intelligence. "Semantic Drift in Espresso-style Bootstrapping: Graph-theoretic Analysis and Evaluation in Word Sense Disambiguation"
August 2010
IPSJ Yamashita SIG Research Award, Information Processing Society of Japan. "Learning Semantic Categories from Web Search Logs Using Label Propagation" (One of the best CS awards in Japan)
March 2009
Best Paper Award, the 14th Annual Meeting of the Association for Natural Language Processing, "Kernelized Semantic Similarity and Generalization of Bootstrapping"
March 2008
Outstanding Paper Award, the 13th Annual Meeting of the Association for Natural Language Processing, "Annotating Predicate-argument and Coreference Relations in Japanese Written Text: From the Experience of Building the NAIST Text Corpus"
November 2005-March 2007
Scholarship of Graduate School of Information Science, Nara Institute of Science and Technology.

Other Academic Activities

Program chair

Area chair

Program committee

Editorial board


Social Activities

June 2004-2014
Fink Project: Developer (Awarded Apple WWDC Student Scholarship in 2006 and 2009)
July 2003-October 2007
Gentoo Project: Developer (CJK team)

Other Information