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RIKEN Center for Advanced Intelligence Project

Privacy and Social System Team

Team Leader: Hiroshi Nakagawa (D.Eng.)
Hiroshi  Nakagawa(D.Eng.)

We analyze the problems caused by the advancing technologies of artificial intelligence and machine learning and then seek the solution for these problems. We need to improve legal systems, social frameworks, industrial structures and information technologies to cope with the problems. Our stance is that the problems caused by artificial intelligence should be solved by artificial intelligence technologies because the complexity of these problems is far beyond human intellectual abilities. We especially focus on the anonymization techniques for private data of individual person among various types of big data because it has strong effect of our social lives.

Main Research Field

Computer Science

Research Subjects

  • Privacy Protection Technologies
  • Influence of Artificial Intelligence to Society

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.
  1. *Junpei Komiyama., Junya Honda., Hiroshi Nakagawa.:
    “Optimal Regret Analysis of Thompson Sampling in Stochastic Multi-armed Bandit Problem with Multiple Plays”
    ICML2015, 1152-1161 (2015).
  2. *Bing Yang., Issei Sato., Hiroshi Nakagawa.:
    “Bayesian Differential Privacy on Correlated Data“
    ACM SIGMOD2015, 747-762 (2015).
  3. *Tengfei Ma., Issei Sato., Hiroshi Nakagawa.:
    “The Hybrid Nested/Hierarchical Dirichlet Process and Its Application to Topic Modeling with Word Differentiation”
    AAAI2015, 2834-2841 (2015).
  4. *Hidekazu Oiwa., Issei Sato., Hiroshi Nakagawa.:
    “Online and Stochastic Learning with a Human Cognitive Bias”
    AAAI2014, 2020-2026 (2014).
  5. *Yang Bin., Hiroshi Nakagawa. :
    “Privacy-Preserving EM Algorithm for Clustering on Social Network”
    PAKDD 2012, Part I, LNAI 7301, 542-553, (2012).
  6. *Yo Ehara,, Nobuyuki Shimizu., Takashi Ninomoya., Hiroshi Nakagawa.:
    “Personalized Reading Support for Second-Language Web Documents”
    ACM Transactions on Intelligent Systems and Technology 4(2) ,31.1-31.19 (2013)
  7. *Minoru Yoshida., Masaki Ikeda., Shingo Ono., Issei Sato., Hiroshi Nakagawa.:
    “Person Name Disambiguation by Bootstrapping”
    The 33rd Annual ACM SIGIR Conference, 10-19 (2010).

Lab Members

Principal Investigator

Hiroshi Nakagawa
Team Leader

Core Members

Douglas Arthur Sipp
Research Scientist
Hiromi Arai
Research Scientist
Hiroaki Kikuchi
Visiting Scientist
Arisa Ema
Visiting Scientist
Gai Matsushita
Visiting Scientist
Shigeo Kawashima
Visiting Scientist
Takehito Utsuro
Visiting Scientist

Contact information

Nihonbashi 1-chome Mitsui Building
15th floor,1-4-1 Nihonbashi,
Chuo-ku, Tokyo 103-0027, Japan

Email: hiroshi.nakagawa [at]

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