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J-GLOBAL ID：200901083802786000   Update date: May. 18, 2023

Koga Hiroki

コガ ヒロキ | Koga Hiroki
Affiliation and department：
University of Tsukuba Faculty of Engineering, Information and Systems

About University of Tsukuba Faculty of Engineering, Information and Systems


Job title： Professor
Research field  (1)： Information theory
Research theme for competitive and other funds  (3)：
  • 2002 - Study on Universal Data Compression
  • Study on the Shannon Theory
  • Study on Visual Cryptology
Papers (82)：
  • 古賀, 弘樹. 一般のアクセス構造に対するランプ型秘密分散法の最適な構成について. IEICE Technical Report. 2023. 433-438
  • Koga, Hiroki. Evaluation of the Optimal Relative Difference of Superimposed All the Shares for a (t,n-Threshold Visual Cryptography Scheme. IEICE Technical Report. 2023. 439-444
  • 古賀, 弘樹. Recent Progress in Visual Cryptography. J. IEICE. 2023. 106. 1. 39-46
  • Koga, Hiroki. On the Optimum Achievable Rates of a Coded Caching Scheme with Small Cache Memory. Proceedings of 2022 International Symposium on Information Theory and its Applications. 2022. 44
  • Koga, Hiroki. On the Optimal Construction of a Visual Cryptography Scheme for Multiple Secret Images. Proceedings of 2022 International Symposium on Information Theory and its Applications. 2022. 168-172
ｍore...
Books (9)：
  • Elements of Information Theory
    共立出版社 2012
  • 2011 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY PROCEEDINGS (ISIT)
    IEEE 2011 ISBN:9781457705953
  • 2010 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY
    IEEE 2010 ISBN:9781424469604
  • 現代数理科学事典
    岩波書店 2009
  • 2008 INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY AND ITS APPLICATIONS, VOLS 1-3
    IEEE 2008 ISBN:9781424420681
ｍore...
Lectures and oral presentations  (19)：
  • Coding Theorems on the Simple Capacity for Digital Fingerprinting Codes
    (Technical Committee on Information Theory 2020)
  • Optimal Construction of the Basis Matrices of an Extended Visual Cryptography Scheme Using Integer Programming
    (The 42nd Symposium on Information Theory and Its Applications 2019)
  • An Ideal Secret Sharing Scheme Realizing an Access Structure Based on a Projective Plane of Order 3
    (The 42nd Symposium on Information Theory and Its Applications 2019)
  • A Construction of the (4; n)-Threshold Visual Cryptography Scheme Using a 3-Design
    (15th International Symposium on Information Theory and its Applications (ISITA) 2018)
  • A Lower Bound on the Joint Capacity of Digital Fingerprinting Codes Using Score Functions Based on Log-Likelihood Ratio
    (IEEE International Symposium on Information Theory (ISIT) 2018)
ｍore...
Education (3)：
  • 1992 - 1995 The University of Tokyo
  • 1990 - 1992 The University of Tokyo Graduate School, Division of Engineering
  • 1988 - 1990 The University of Tokyo Faculty of Engineering
Professional career (1)：
  • 博士(工学) (東京大学)
Committee career (4)：
  • 2017/05 - 現在 IEICE 副サブソ長
  • 2017/05 - 現在 電子情報通信学会 情報理論とその応用サブソサイエティ
  • 2019/06 - 2021/05 電子情報通信学会 情報理論とその応用サブソサイエティ サブソサイエティ長
  • 2017/05 - 2019/05 電子情報通信学会 情報理論とその応用サブソサイエティ 副サブソサイエティ長
Awards (2)：
  • 2001 - SITA2000奨励賞
  • 1998 - 1998年暗号と情報セキュリティシンポジウム論文賞
Association Membership(s) (2)：
THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS. ,  Institute of Electrical and Electronics Engineers (IEEE)
※ Researcher’s information displayed in J-GLOBAL is based on the information registered in researchmap. For details, see here.

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