IWATA Ken-ichi

FacultyInformation Science
Teacher OrganizationInformation Science
Education and
 Research Organization
Faculty of Engineering /Graduate School of Engineering
PositionAssociate Professor
Last Updated: 19/12/06 14:50

Researcher Profile & Settings

Name

    IWATA Ken-ichi

Affiliation

  •  Information Science Associate Professor

Research Activities

Published Papers

  • Countably Infinite Multilevel Source Polarization for Non-Stationary Erasure Distributions
    Y. Sakai, K. Iwata, H. Fujisaki
    Proceedings of 2019 IEEE International Symposium on Information Theory 2109-2113 Jul.  2019 Refereed
  • Enumeration and Coding of Compact Code Trees for Binary AIFV Codes
    K Hashimoto, K Iwata, H Yamamoto
    Proceedings of 2019 IEEE International Symposium on Information Theory 1527-1531 Jul.  2019 Refereed
  • An Iterative Algorithm to Optimize the Average Performance of Markov Chains with Finite States
    R Fujita, K Iwata, H Yamamoto
    Proceedings of 2019 IEEE International Symposium on Information Theory (ISIT) 1902-1906 Jul.  2019 Refereed
  • Asymptotic Distribution of Multilevel Channel Polarization for a Certain Class of Erasure Channels
    Yuta Sakai, Ken-ichi Iwata, Hiroshi Fujisaki
    2018 IEEE International Symposium on Information Theory (ISIT) 856-860 Jun.  2018 Refereed
  • Dynamic Programming Approach of Optimal Upgradation Algorithm for an Auxiliary Random Variable of a Bernoulli Random Variable
    Yuta Sakai, Ken-ichi Iwata
    Proceedings of 2018 IEEE International Symposium on Information Theory 146-150 Jun.  2018 Refereed
  • An Optimality Proof of the Iterative Algorithm for AIFV-$m$ Codes
    Ryusei Fujita, Ken-ichi Iwata, Hirosuke Yamamoto
    Proceedings of 2018 IEEE International Symposium on Information Theory 2187-2191 Jun.  2018 Refereed
  • Extremality Between Symmetric Capacity and Gallager’s Reliability Function E_0 for Ternary-Input Discrete Memoryless Channels
    Yuta Sakai, Ken-ichi Iwata
    IEEE Transactions on Information Theory 64(1) 163-191 Jan.  2018 Refereed
  • Extremality for error exponents of q-ary input discrete memoryless channels
    Yuta Sakai, Ken-ichi Iwata
    Proceedings of Workshop AEW10 Concepts in Information Theory and Communications 7-7 Jun.  2017 Not refereed
  • An Iterative Algorithm to Construct Optimal Binary AIFV-m Codes
    Ken-ichi Iwata, Hirosuke Yamamoto
    Proceedings of 2017 IEEE Information Theory Workshop (ITW2017) 519-523 Nov.  2017 Refereed
  • Optimal quantization of B-DMCs maximizing α-mutual information with monge property
    Yuta Sakai, Ken-ichi Iwata
    Proceedings of 2017 IEEE International Symposium on Information Theory (ISIT2017) 2673-2677 Jun.  2017 Refereed
  • Sharp bounds on Arimoto's conditional Renyi entropies between two distinct orders
    Yuta Sakai, Ken-ichi Iwata
    Proceedings of 2017 IEEE International Symposium on Information Theory (ISIT2017) 2985-2989 Jun.  2017 Refereed
  • Lossless Data Compression via Substring Enumeration for k-th Order Markov Sources with a Finite Alphabet
    Ken-ichi Iwata, Mitsuharu Arimura
    IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences E99-A(12) 2130-2135 Dec.  2016 Refereed
  • Extremal relations between shannon entropy and ?α-norm
    Yuta Sakai, Ken-ichi Iwata
    Proceedings of 2016 International Symposium on Information Theory and Its Applications (ISITA2016) 433-437 Oct.  2016 Refereed
  • A dynamic programming algorithm to construct optimal code trees of AIFV codes
    Ken-ichi Iwata, Hirosuke Yamamoto
    Proceedings of 2016 International Symposium on Information Theory and Its Applications (ISITA2016) 672-676 Oct.  2016 Refereed
  • A generalized erasure channel in the sense of polarization for binary erasure channels
    Yuta Sakai, Ken-ichi Iwata
    Proceedings of 2016 IEEE Information Theory Workshop (ITW2016)-(5) Sep.  2016 Refereed
  • Relations between conditional Shannon entropy and expectation of ?α-norm
    Yuta Sakai, Ken-ichi Iwata
    Proceedings of 2016 IEEE International Symposium on Information Theory (ISIT2016) 81-85 Jul.  2016 Refereed
  • Feasible regions of symmetric capacity and Gallager's E0 function for ternary-input discrete memoryless channels
    Yuta Sakai, K. Iwata
    Proceedings of 2015 IEEE International Symposium on Information Theory 81-85 Jun.  2015 Refereed
  • Lossless Data Compression via Substring Enumeration for k-th Order Markov Sources with a Finite Alphabet
    K.Iwata, M. Arimura
    Data Compression Conference 452 Apr.  2015 Refereed
  • Evaluation of Maximum Redundancy of Data Compression via Substring Enumeration for k-th Order Markov Sources
    Ken-ichi IWATA, Mitsuharu ARIMURA, Yuki SHIMA
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences Vol.E97-A(No.8) 1754-1760 Aug.  2014 Refereed
  • Quantizer design for outputs of binary-input discrete memoryless channels using SMAWK algorithm
    K. Iwata, Shin-ya Ozawa
    Proc. of 2014 IEEE International Symposium on Information Theory 191-195 Jun.  2014 Refereed
  • Suboptimal Quantizer Design for Outputs of Discrete Memoryless Channels with a Finite-Input Alphabet
    Y. Sakai, K. Iwata
     120-124 Oct.  2014 Refereed
  • Redundancy Optimal FF Codes for a General Source and Its Relationships to the Rate-Optimal FF Codes
    Mitsuharu ARIMURA, Hiroki KOGA, Ken-ichi IWATA
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E96-A(12) 2332-2342 Dec.  2013 Refereed
  • A Characterization of Optimal FF Coding Rate Using a New Optimistically Optimal Code
    Mitsuharu ARIMURA, Hiroki KOGA, Ken-ichi IWATA
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E96-A(12) 2443-2446 Dec.  2013 Refereed
  • On variable-to-fixed length coding of a general source with Infinite alphabet
    M. Arimura, K. Iwata
     485-488 Jan.  2012 Refereed
  • On the maximum redundancy of CSE for I.I.D. sources
    K. Iwata, M. Arimura, Y. Shima
     489-492 Jan.  2012 Refereed
  • Coding Theorems on the Worst-Case Redundancy of Fixed-Length Coding for a General Source
    H. Koga, M. Arimura, K. Iwata
    Proc. of 2011 IEEE International Symposium on Information Theory Aug.  2011 Refereed
  • An Improvement in Lossless Data Compression via Substring Enumeration
    K. Iwata, M. Arimura, Y. Shima
     219-223 May  2011 Refereed
  • An effecitive optimization of reference pixel arrangement in the lossless coding for HDTV image
    Y. Yamaguchi, T. Otsuki, K. Iwata, S. Itoh
     246-251 Aug.  2010 Refereed
  • On the Achievable Redundancy Rate of Fixed Length Source Code for General Sources
    M. Arimura, K. Iwata
    Proc. of 2010 IEEE International Symposium on Information Theory Jun.  2010 Refereed
  • The Minimum Achievable Redundancy Rate of Fixed-to-Fixed Length Source Codes for General Sources
    M. Arimura, K. Iwata
     595-600 Jan.  2010 Refereed
  • A Prefix-free Coding for Finite-State Noiseless Channels with Small Coding Delay
    K. Iwata, T. Koyama
     473-477 Jan.  2010 Refereed
  • Information-Spectrum Characterization of a Multi-terminal Channel with General Correlated Sources
    K.Iwata, Y.Oohama
     177-182 Jan.  2006 Refereed
  • Information-Spectrum Characterization of Multiple-Access Channels with Correlated Sources
    K.Iwata, Y.Oohama
     E88-A(11) 3196-3202 Nov.  2005 Refereed
  • On Multiple-Access Communication System for General Correlated Sources with an Array of General Independent Channels
    K.Iwata
     Sep.  2005 Refereed
  • A new approach of DCA by using BWT
    B.Zhao, K.Iwata, S.Itoh, T.Kato
     Mar.  2005 Refereed
  • Channel Coding Algorithm Simulating the Random Coding
    K.Iwata, J.Muramatsu
     315 Jun.  2003 Refereed
  • An information-spectrum approach to rate-distortion function with side information
    K.Iwata, J.Muramatsu
     E85-A(6) 1387-1395 Jun.  2002 Refereed
  • A Simple Parallel Algorithm for the Ziv-Lempel Encoding
    K.Iwata, M.Morii, T.Uyematsu, E.Okamoto
     E81-A(4) 709-712 Apr.  1998 Refereed
  • An efficient universal coding algorithm for noiseless channel with symbols of unequal cost
    K.Iwata, M.Morii, T.Uyematsu
     E80-A(11) 2232-2237 Nov.  1997 Refereed
  • A simple universal coding scheme for arbitrary cost of code symbol
    K.Iwata, T.Uyematsu, M.Morii
     418 Jun.  1997 Refereed

Conference Activities & Talks

  • A Universal Source Code Based on the AIVF Coding Strategy
    H. Yamamoto, K. Hashimoto, K. Iwata
    11th-Asia-Europe Workshop on Concepts in Information Theory Jul.  2019