Centers & Labs

RIKEN Center for Computational Science

Discrete Event Simulation Research Team

Team Leader: Nobuyasu Ito (D.Sci.)
Nobuyasu  Ito(D.Sci.)

Explosive growth of computer performance has been bringing us the better grasp of global society.
Now with top computers, a new era of social applications has begun: microscopic simulations of our world and society. Such top computers with 10PFLOPS or more performance, simulations of billions to trillions of complex elements possible, and the number and their complexity will grow with next Exascale and future Zetascale computers.
With such computational power, we can challenge complex behavior of substance with direct simulation using molecular models, and social phenomena using models of each human, each vehicle and each transaction distributed and networked in global space.
This team challenges such microscopic simulations for macroscopic phenomena, which we call the "Neo-Avogadro Challenge", with K and future computers of Exascale and beyond.

Main Research Field

Mathematical and physical sciences

Related Research Fields

Informatics / Complex systems / Social sciences


  • Statistical physics
  • Computational physics
  • Complex system
  • Nonequilibrium phenomena
  • Nonlinear phenom

Selected Publications

  1. Hiroshi Watanabe, Masaru Suzuki, Hajime Inaoka, and Nobuyasu Ito:
    "Ostwald ripening in multiple-bubble nuclei,"
    The Journal of Chemical Physics, Vol. 141, No. 23, 234703 (2014).
  2. Yohsuke Murase, Janos Torok, Hang-Hyun Jo, Kimmo Kaski, and Janos Kertesz,:
    "Multilayer weighted social network model"
    Physical Review E, 90, (2014) 052810.
  3. Yohsuke Murase, Takeshi Uchitane, and Nobuyasu Ito,:
    "A tool for parameter-space exploration"
    Physics Procedia 57 pp. 73-76 (2014)

Lab Members

Principal Investigator

Nobuyasu Ito
Team Leader

Core Members

Hajime Inaoka
Research Scientist
Yohsuke Murase
Research Scientist
Naoki Yoshioka
Research Scientist
Shih-Chieh Wang
Postdoctoral Researcher
Daigo Umemoto
Postdoctoral Researcher
Tomio Kamada
Visiting Scientist
Takeshi Uchitane
Visiting Scientist

Contact information

7-1-26 Minatojima-minami-machi, Chuo-ku,
Kobe, Hyogo,
650-0047 Japan

Email: ito [at]

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