Masayoshi Mizutani (水谷 正慶)

who is interested in

  • Network Security for Defence, Detection and Security Forensics
  • Software/Service development, not only web service but also raw level system and tools for OS and Network
  • New Technologies: Modern web services/software, programming language and frameworks, exploratory data analysis, data visualization, distributed systems, advanced network system such as SDN.



Ph.D (Media and Governance), 2010 Keio University

  • Apr 2011 – Present: IBM Japan, Tokyo Research, Research Staff
    • Design, implementation and integration of System Log Management System for IBM Cloud (2011-2014)
    • Technical support and development of Security Information and Event Manager (2013)
    • Research system log analytics technology (data mining, pattern recognition, etc) (2011-present)
  • Dec 2010: Internet Systems Consortium, Intership
  • Oct 2010: Research Fellow PD of Japan Society for the Promotion of Science
  • Oct 2010: Visiting Researcher of Keio Research Institute at SFC
  • Sep 2010: Ph.D. in Media and Governance, Keio University, Tokyo
  • Mar 2008: Master of Media and Governance, Keio University, Tokyo
  • Mar 2006: Bachelor of Arts in Environmental Information, Keio University, Tokyo


  • “Incremental Mining of System Log Format”, Masayoshi Mizutani, SCC ‘13 Proceedings of the 2013 IEEE International Conference on Services, 2013
  • “A Malware Detection Method based on Communication Commonality – Implementation and Evaluation”, Masayoshi Mizutani, Akira Kanai, Keiji Takeda, Jun Murai, IPSJ 2009. Vol.50 No.9, Sep. 2009
  • “An Analysis of Web Distributed Malwares and A Proposal of Their Detection Method”, Masayoshi Mizutani, Keiji Takeda, Jun Murai, IPSJ 2009. Vol.50 No.9, Oct. 2009
  • “The Design and Implementation of Session Based IDS”, Masayoshi Mizutani, Shin Shirahata, Masaki Minami, Jun Murai, IEICE Transactions on Communications (Japanese Edition), IEICE, Vol.89, No.3, pp.46-58, Nov. 2005


  • Stage Staff (Sound Engineering)
  • Jogging, Muscle training
  • Gaming (World of Warcraft, Starcraft, etc.)


  • Programing Language
    • C (2000-)
    • C++ (2010-)
    • PHP (2003-)
    • Python (2010-)
    • Java (2011-)
    • Java Script (2010-)
    • Tasted: Perl, Ruby, Lisp, Shell Script
  • Experienced OS
    • Windows (2000-)
    • MacOSX (2006-)
    • Unix [Linux, FreeBSD, NetBSD] (2002-)
  • Certification Exams
    • Class II Information Technology Engineer Examination (Japan, 2000)
    • Software Design & Development Engineer Examination (Japan, 2001)
  • Miscellaneous Skills
    • Unix Server Operation [Linux, FreeBSD, NetBSD, SunOS] (2001-2010)
    • Network Management & Operation (2002-2010)
    • Other strong point: Network traffic analysis, Log analysis