J-GLOBAL         Last updated: Mar 6, 2019 at 14:40
Hiroshi Maruyama
Preferred.Networks, Inc.
Job title
PFN Fellow
Dr. Engineering(Kyoto University)
Other affiliation
Shizuoka University
Twitter ID


Dr. Hiroshi Maruyama has spent 26 years in IBM Research, Tokyo Research Laboratory, working on various computer science areas such as artificial intelligence, natural language processing, machine translation, hand-writing recognition, multimedia, XML, Web Services, and security. He was the director of IBM Tokyo Research Laboratory from 2006 to 2009. From 2011 to 2016, he was a professor at the Institute of Statistical Mathematics where he worked on projects related to big data, statistics, and their impacts on society. He joined Preferred Networks, Inc. in April 2016 as the chief strategy officer. His current research interests include practical applications of machine learning, social implications of information technology and machine learning, and computer science and statistics in general. Currently he is a PFN Fellow.

Research Areas


Academic & Professional Experience

May 2018
PFN Fellow, Preferred Networks, Inc.
Apr 2016
Apr 2018
Chief Strategy Officer, Preferred Networks, Inc.
Apr 2011
Mar 2016
Professor, The Institute of Statistical Mathematics
Nov 2009
Sep 2010
Deputy Group Executive, Digital Platform Development HQ, Canon, Inc.
Apr 1983
Apr 2009
IBM Research, Tokyo Research Laboratory


Apr 1981
Mar 1983
MS, Dept. of Information Science, Tokyo Institute of Technology

Published Papers

Lect Notes Comput Sci   5017 13-16   2008   [Refereed]
Nicolas Schwind,Morgan Magnin,Katsumi Inoue,Tenda Okimoto,Taisuke Sato,Kazuhiro Minami,Hiroshi Maruyama
J. Reliable Intelligent Environments   2(1) 17-35   2016   [Refereed]
Lect Notes Comput Sci   4189 65-80   2006   [Refereed]
Hiroshi Maruyama,Günter Müllerr,Kazuo Furuta
NII Shonan Meet. Rep.   2015    2015   [Refereed]
Hiroshi Maruyama
15th International Conference on Computational Linguistics, COLING 1994, Kyoto, Japan, August 5-9, 1994   208-213   1994   [Refereed]
Since the Japanese language does not have explicit word boundaries, dictionary lookup should be done, in principle, for all possible substrings
Rungsiman Nararatwong,Roberto S. Legaspi,Hitoshi Okada,Hiroshi Maruyama
Social Computing, Behavioral-Cultural Modeling, and Prediction - 8th International Conference, SBP 2015, Washington, DC, USA, March 31-April 3, 2015. Proceedings   153-162   2015   [Refereed]
Hiroshi Maruyama, Hideo Watanabe, Shiho Ogino
13th International Conference on Computational Linguistics, COLING 1990, University of Helsinki, Finland, August 20-25, 1990   257-262   1990   [Refereed]
In this paper, we describe a working system for interactive Japanese syntactic anMysis. A human 'user can intervene during parsing to help the sys- ,em to produce. a correct parse tree. Human inl, eractions are limited to the very simple task of h...
Tomoya Tanjo,Kazuhiro Minami,Ken Mano,Hiroshi Maruyama
Information and Communication Technology - Second IFIP TC5/8 International Conference, ICT-EurAsia 2014, Bali, Indonesia, April 14-17, 2014. Proceedings   511-520   2014   [Refereed]
Hiroshi Maruyama
28th Annual Meeting of the Association for Computational Linguistics, 6-9 June 1990, University of Pittsburgh, Pittsburgh, Pennsylvania, USA, Proceedings.   31-38   1990   [Refereed]
We present a new grammatical formalism called Constraint Dependency Grammar (CDG) in which every grammatical rule is given as a constraint on wordto -word modifications. CDG parsing is formalized as a constraint satisfaction problem over a finite ...
Ken Mano,Kazuhiro Minami,Hiroshi Maruyama
IEEE 3rd Global Conference on Consumer Electronics, GCCE 2014, Tokyo, Japan, 7-10 October 2014   691-695   2014   [Refereed]
Krishna Nathan, Homayoon S. M. Beigi, Jayashree Subrahmonia, Gregory J. Clary, Hiroshi Maruyama
1995 International Conference on Acoustics, Speech, and Signal Processing, ICASSP '95, Detroit, Michigan, USA, May 08-12, 1995   2619-2622   1995   [Refereed]
We address the problem of automatic recognition of unconstrained handwritten text. Statistical methods, such as hidden Markov models (HMMs) have been used successfully for speech recognition and they have recently been applied to the problem of ha...
Roberto S. Legaspi,Hiroshi Maruyama,Rungsiman Nararatwong,Hitoshi Okada
2014 IEEE Fourth International Conference on Big Data and Cloud Computing, BDCloud 2014, Sydney, Australia, December 3-5, 2014   547-554   2014   [Refereed]
Tomoya Tanjo,Kazuhiro Minami,Ken Mano,Hiroshi Maruyama
JoWUA   5(3) 63-78   2014   [Refereed]
Takeshi Imamura, Hiroshi Maruyama
2001 Symposium on Applications and the Internet (SAINT 2001), 8-12 January 2001, San Diego, CA, USA, Proceedings   57-64   2001   [Refereed]
Abstract Syntax Notation One (ASN.1) is a framework for representing tree structured data. It is widely used in communication protocols (e.g., LDAP), security protocols (e.g., X.509), and so on. ASN.1 is designed for e ciency and the data is packe...
Ken Mano,Kazuhiro Minami,Hiroshi Maruyama
2013 IEEE International Conference on Pervasive Computing and Communications Workshops, PERCOM 2013 Workshops, San Diego, CA, USA, March 18-22, 2013   285-290   2013   [Refereed]
Hiroshi Maruyama,Daisuke Okanohara,Shohei Hido
13th IEEE International Conference on Data Mining Workshops, ICDM Workshops, TX, USA, December 7-10, 2013   702-705   2013   [Refereed]
Tenda Okimoto,Naoto Ikegai,Katsumi Inoue,Hitoshi Okada,Tony Ribeiro,Hiroshi Maruyama
43rd Annual IEEE/IFIP Conference on Dependable Systems and Networks Workshop, DSN Workshops 2013, Budapest, Hungary, June 24-27, 2013   1-7   2013   [Refereed]
Hiroshi Maruyama
43rd Annual IEEE/IFIP Conference on Dependable Systems and Networks Workshop, DSN Workshops 2013, Budapest, Hungary, June 24-27, 2013   1-4   2013   [Refereed]
Nicolas Schwind,Tenda Okimoto,Katsumi Inoue,Hei Chan,Tony Ribeiro,Kazuhiro Minami,Hiroshi Maruyama
International conference on Autonomous Agents and Multi-Agent Systems, AAMAS '13, Saint Paul, MN, USA, May 6-10, 2013   785-788   2013   [Refereed]
Ken Mano,Kazuhiro Minami,Hiroshi Maruyama
2013 International Conference on Availability, Reliability and Security, ARES 2013, Regensburg, Germany, September 2-6, 2013   615-624   2013   [Refereed]
Hiroshi Maruyama,Kiyoshi Watanabe,Sachiko Yoshihama,Naohiko Uramoto,Yoichiro Takehora,Kazuhiro Minami
2013 International Conference on Availability, Reliability and Security, ARES 2013, Regensburg, Germany, September 2-6, 2013   525-529   2013   [Refereed]
Sachiko Yoshihama,Tim Ebringer,Megumi Nakamura,Seiji Munetoh,Takuya Mishina,Hiroshi Maruyama
Test and Analysis of Web Services   441-469   2007   [Refereed]
Ernesto Damiani,Gabriele Gianini,Hiroshi Maruyama
Comput. Syst. Sci. Eng.   21(5)    2006   [Refereed]
Sachiko Yoshihama,Tim Ebringer,Megumi Nakamura,Seiji Munetoh,Hiroshi Maruyama
2005 IEEE International Conference on Web Services (ICWS 2005), 11-15 July 2005, Orlando, FL, USA   743-750   2005   [Refereed]
Hiroshi Maruyama,Taiga Nakamura,Tony Hsieh
Proceedings of the 2003 ACM Workshop on XML Security, Fairfax, VA, USA, October 31, 2003   79-85   2003   [Refereed]
Takeshi Imamura,Andy Clark,Hiroshi Maruyama
Proceedings of the 2002 ACM Workshop on XML Security, Fairfax, VA, USA, November 22, 2002   11-17   2002   [Refereed]
Mikio Aoyama,Sanjiva Weerawarana,Hiroshi Maruyama,Clemens A. Szyperski,Kevin J. Sullivan,Doug Lea
Proceedings of the 24th International Conference on Software Engineering, ICSE 2002, 19-25 May 2002, Orlando, Florida, USA   647-648   2002   [Refereed]
Hiroshi Maruyama,Kent Tamura,Naohiko Uramoto
RFC   2803 1-11   2000   [Refereed]
Naohiko Uramoto,Hiroshi Maruyama
Proceedings of the 1999 International Conference on Parallel Processing Workshops, ICPPW 1999, Wakamatsu, Japan, September 21-24, 1999   260-267   1999   [Refereed]
Hiroshi Maruyama
14th International Conference on Computational Linguistics, COLING 1992, Nantes, France, August 23-28, 1992   1162-1166   1992   [Refereed]
Hiroshi Maruyama,Akinori Yonezawa
New Generation Comput.   2(1) 91-99   1984   [Refereed]
Hiroshi Maruyama, Shiho Ogino, Masaru Hidano
Large corpora with part-of-speech tagging play a very important role in recent statisticsbased and example-based natural language processing systems. However, no such corpora have become widely available for Japanese so far. Because the Japanese l...
Maruyama, Hiroshi 統計数理研究所, Minami, Kazuhiro 統計数理研究所
Innovation and Supply Chain Management   7 3   Sep 2013   [Refereed]


Rungsiman Nararatwong, Rungsiman Nararatwong, Roberto Legaspi, Hitoshi Okada, Hiroshi Maruyama
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)   9021 153-162   Jan 2015
© Springer International Publishing Switzerland 2015. Marketers have devoted their efforts to comprehend the essence of negative electronic word-of-mouth (eWOM) since it was first introduced to understand brand crisis and the fact that social medi...
Roberto Legaspi, Hiroshi Maruyama, Rungsiman Nararatwong, Hitoshi Okada
Proceedings - 4th IEEE International Conference on Big Data and Cloud Computing, BDCloud 2014 with the 7th IEEE International Conference on Social Computing and Networking, SocialCom 2014 and the 4th International Conference on Sustainable Computing and C   547-554   Jan 2015
© 2014 IEEE. Resilience is the capacity of a system to withstand large disturbances and dramatically changing conditions without losing its core purpose and integrity and achieve generalized recovery once failure happens. Due to the many dimension...
Nana Arizumi, Kazuhiro Minami, Tomoya Tanjo, Hiroshi Maruyama, Daisuke Murakami, Yoshiki Yamagata
2014 7th International Conference on Information and Automation for Sustainability: "Sharpening the Future with Sustainable Technology", ICIAfS 2014      Jan 2014
© 2014 IEEE. We study a graph partitioning problem for electrical grids such that a given grid is partitioned into multiple ones that are self-contained concerning electricity balance. Our goal is to find a resilient partition against time-changin...
Tomoya Tanjo, Kazuhiro Minami, Ken Mano, Hiroshi Maruyama
Journal of Wireless Mobile Networks, Ubiquitous Computing, and Dependable Applications   5 63-78   Jan 2014
© 2014, Innovative Information Science and Technology Research Group. All rights reserved. Pseudonymization is an effective way to publish a location dataset with trajectory information in a privacy-preserving way. We previously proposed a techniq...
Kazuhiro Minami, Roberto Legaspi, Tomoya Tanjo, Hiroshi Maruyama, Yoshiki Yamagata
Proceedings of the 2014 International Conference and Utility Exhibition on Green Energy for Sustainable Development, ICUE 2014      Jan 2014
Resilience to a disruptive change in the ecological system is an essential property that makes our society sustainable. There seems to be a consensus among many researchers in various disciplines that diversity and adaptability are two of the key ...

Books etc

Hiroshi Maruyama, Kent Tamura, Naohiko Uramoto, Makoto Murata, Andy Clark, Yuichi Nakamura, Ryo Neyama, Kazuya Kosaka, Satoshi Hada (Part:Joint Work)
Addison-Wesley Professional   May 2002   ISBN:0201770040
Hiroshi Maruyama, Maruyama, Tamura (Part:Joint Work)
Prentice Hall   Nov 2001   ISBN:8483222426
Hiroshi Maruyama
Addison-Wesley Pub (Sd)   Apr 2001   ISBN:0201616114

Conference Activities & Talks

Towards Systems Resilience
IBM Research Colloquium on Societal Resilience   13 Oct 2011   
Resilience Engineering: State of the Art and Research Challenges.
5 Sep 2012   
Formalizing the Resilience of Open Dynamic Systems
Joint Agent Workshop and Symposium (JAWS)   24 Oct 2012   
Protecting Location Privacy with K-Confusing Paths Based on Dynamic Pseudonyms
5th IEEE International Workshop on SEcurity and SOCial Networking (SESOC)   18 Mar 2013   
Systems resilience: a challenge problem for dynamic constraint-based agent systems
the 12th International Conference on Autonomous Agents and Multiagent Systems (AAMAS),   6 May 2013