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2014 Fiscal Year Annual Research Report

非線形偏微分方程式系における解軌道のP進解析による複雑性構造解析

Research Project

Project/Area Number 24540180
Research InstitutionKumamoto University

Principal Investigator

内藤 幸一郎  熊本大学, 自然科学研究科, 教授 (10164104)

Co-Investigator(Kenkyū-buntansha) 城本 啓介  熊本大学, 自然科学研究科, 教授 (00343666)
三沢 正史  熊本大学, 自然科学研究科, 教授 (40242672)
和田 健志  島根大学, 総合理工学研究科(研究院), 教授 (70294139)
Project Period (FY) 2012-04-01 – 2015-03-31
KeywordsP-進数論 / 連分数展開 / 格子理論 / 暗号理論 / 非線形偏微分方程式 / 力学系
Outline of Annual Research Achievements

平成26年度では代表者は多次元p-進近似格子を利用した多重p-進無理数有理近似解析の研究を行い、多重近似指数とp進弱Liouville型無理数の有理近似指数との間に成立する不等式関係を導出した。さらに、p-進弱Liouville型無理数の冪を振動数としてもつ多重準周期力学系の離散軌道の再帰性について解析し、再帰的次元のGAP値が正の値を取ることを導くことにより、軌道が予測不能性を持つことを示した。これらの研究結果は、学術雑誌 P-adic Numbers Ultrametric Anal. Appl.に掲載された。さらに、代表者はp-進展開の係数からなる記号列から構成される記号力学系の解析を行い、この力学系の再帰的次元と位相的エントロピーとの間に成立する不等式を導いた。p-進展開列がSturm列で、その回転指数がLiouville数の場合には再帰的次元のGAP値が正となり、軌道が予測不能性を持つことを示した。これらの結果は、ICM Satellite Conf. 2014:NAO-2014での招待講演で発表し、詳細は上述の学術雑誌に掲載予定である。
代表者はp-進近似格子における最小ベクトル問題(SVP)について、多重p-進無理数有理近似理論から得られる理論値と、LLLアルゴリズムを用いた実験値との比較検証を行い、これらの実験結果に基づいた暗号系の提案を行った。これらの結果は、国際学会NAO2014で講演発表を行い、同会議論文誌に掲載予定である。また、p-進knapsack暗号の提案を国内学会での講演発表を通して行った。
本研究に関連して、分担者三沢氏はpラプラシアンを含む偏微分方程式の定性解析結果をJ. Diff. Eq. に発表し、分担者城本氏は符号理論に関わる結果をLinear Algebra Appl. に論文発表し、組み合わせ論の国際学会で基調講演発表を行った。

  • Research Products

    (25 results)

All 2015 2014

All Journal Article (13 results) (of which Peer Reviewed: 11 results,  Open Access: 2 results) Presentation (12 results) (of which Invited: 4 results)

  • [Journal Article] Simultaneous approximations of p-adic numbers and their applications to cryptography2015

    • Author(s)
      Hirohito Inoue, Shoichi Kamada, Koichiro Naito
    • Journal Title

      The proceedings of The Fourth Asian Conference on Nonlinear Analysis and Optimization.

      Volume: 4 Pages: 印刷中

    • Peer Reviewed
  • [Journal Article] Transference principle on simultaneous approximation problems of p-adic numbers and multidimensional p-adic approximation lattices2015

    • Author(s)
      Hirohito Inoue, Shoichi Kamada, Koichiro Naito
    • Journal Title

      The proceedings of The Fourth Asian Conference on Nonlinear Analysis and Optimization.

      Volume: 4 Pages: 印刷中

    • Peer Reviewed
  • [Journal Article] Entropy and recurrent dimensions of discrete dynamical systems given by p-adic expansions2015

    • Author(s)
      H. Inoue, K. Naito
    • Journal Title

      p-Adic Numbers, Ultrametric Analysis and Applications

      Volume: 7 Pages: 147-157

    • Peer Reviewed
  • [Journal Article] Lattice reduction algorithms and their cryptographic applications2015

    • Author(s)
      Hirohito Inoue, Koichiro Naito, Yuma Yamada
    • Journal Title

      Proceedings of the 8th International Conference on Nonlinear Analysis and Convex Analysis

      Volume: 8 Pages: 167-176

    • Peer Reviewed
  • [Journal Article] Simultaneous rational approximations of a p-adic number and its powers by p-adic approximation lattices2015

    • Author(s)
      Hirohito Inoue, Koichiro Naito
    • Journal Title

      Proceedings of the 8th International Conference on Nonlinear Analysis and Convex Analysis

      Volume: 8 Pages: 155-166

    • Peer Reviewed
  • [Journal Article] A note on a basic exact sequence for the Lee and Euclidean weights of linear codes over Z_l2015

    • Author(s)
      Minjia Shi, Keisuke Shiromoto, Patrick Sole
    • Journal Title

      Linear Algebra and its Applications

      Volume: - Pages: 印刷中

    • DOI

      10.1016/j.laa.2015.01.033

    • Peer Reviewed
  • [Journal Article] H\"{o}lder regularity for singular parabolic systems of p-Laplacian type2015

    • Author(s)
      Corina Karim, Masashi Misawa
    • Journal Title

      J. Differential Equations

      Volume: - Pages: 印刷中

    • Peer Reviewed
  • [Journal Article] Simultaneous rational approximations of p-adic numbers by the LLL lattice basis reduction algorithm2014

    • Author(s)
      Hirohito Inoue, Koichiro Naito
    • Journal Title

      京都大学数理解析研究所講究録

      Volume: 1923 Pages: 163-171

    • Open Access
  • [Journal Article] Recurrent properties of quasi-periodic dynamical systems with multiple frequencies of p-adic Liouville numbers2014

    • Author(s)
      H. Inoue, K. Naito
    • Journal Title

      p-Adic Numbers, Ultrametric Analysis and Applications

      Volume: 6 Pages: 195-206

    • DOI

      10.1134/S2070046614030030

    • Peer Reviewed
  • [Journal Article] On critical exponents of matroids and linear codes2014

    • Author(s)
      Keisuke Shiromoto
    • Journal Title

      京都大学数理解析研究所講究録

      Volume: 1889 Pages: 7-12

    • Open Access
  • [Journal Article] Group covariance and formula of channel matrix of coded 4PSK signals by linear codes over F_42014

    • Author(s)
      M. Tanaka, T. Sogabe, K. Shiromoto, T. S. Usuda
    • Journal Title

      Proceedings of International Symposium on Information Theory and Its Applications 2014

      Volume: - Pages: 348

    • Peer Reviewed
  • [Journal Article] Formula of channel matrix for covariant signal set with respect to a direct product of groups2014

    • Author(s)
      T. S. Usuda, T. Sogabe, K. Shiromoto
    • Journal Title

      Proceedings of 12th International Conference on Quantum Communication, Measurement and Computing

      Volume: - Pages: 45

    • Peer Reviewed
  • [Journal Article] The regularity for nonlinear parabolic systems of p-Laplacian type with critical growth2014

    • Author(s)
      Chiara Leone, Masash Misawa, Anna Verde
    • Journal Title

      J. Differential Equations

      Volume: 256 Pages: 2807-2845

    • DOI

      10.1016/j.jde.2014.01.018

    • Peer Reviewed
  • [Presentation] On the covering dimension of a linear code2015

    • Author(s)
      城本 啓介
    • Organizer
      研究集会「有限幾何と組合せデザイン」
    • Place of Presentation
      東京理科大学、東京
    • Year and Date
      2015-03-07 – 2015-03-07
  • [Presentation] On the critical exponent of a linear code and a matroid2015

    • Author(s)
      Keisuke Shiromoto
    • Organizer
      The 13th Japan-Korea Workshop on Algebra and Combinatorics
    • Place of Presentation
      九州工業大学、福岡
    • Year and Date
      2015-01-30 – 2015-01-30
  • [Presentation] 多次元p進近似格子と暗号理論への応用2015

    • Author(s)
      井上裕仁、内藤幸一郎
    • Organizer
      2015年暗号と情報セキュリティシンポジウム
    • Place of Presentation
      リーガロイヤルホテル小倉, 北九州
    • Year and Date
      2015-01-22 – 2015-01-22
  • [Presentation] Monotonicity type estimate and regularity of the p-harmonic map heat flows2014

    • Author(s)
      Masashi Misawa
    • Organizer
      台湾数学会, 関数方程式分科会
    • Place of Presentation
      台湾成功大学、台南市、台湾
    • Year and Date
      2014-12-06 – 2014-12-06
    • Invited
  • [Presentation] On the covering dimensions of a linear code and its relation to matroids2014

    • Author(s)
      Keisuke Shiromoto
    • Organizer
      38th Australasian Conference on Combinatorial Mathematics and Combinatorial Computing (38ACCMCC)
    • Place of Presentation
      Victoria University of Wellington, Wellington, New Zealand
    • Year and Date
      2014-12-02 – 2014-12-02
  • [Presentation] Simultaneous approximation problems of p-adic numbers and their applications to cryptography2014

    • Author(s)
      Hirohito Inoue, Koichiro Naito
    • Organizer
      京都大学数理解析研究所共同研究研究集会「準結晶の数学的モデルとその周辺 」
    • Place of Presentation
      京都大学数理解析研究所、京都
    • Year and Date
      2014-10-29 – 2014-10-29
  • [Presentation] The shortest vector problems in p-adic approximation lattices and their applications to cryptography2014

    • Author(s)
      Hirohito Inoue, Koichiro Naito
    • Organizer
      The International Workshop on Nonlinear Analysis and Convex Analysis
    • Place of Presentation
      Kyoto University, Kyouto
    • Year and Date
      2014-08-19 – 2014-08-19
    • Invited
  • [Presentation] Inhomogeneous simultaneous approximations of p-adic numbers and their applications to cryptography2014

    • Author(s)
      Hirohito Inoue, Shoichi Kamada, Koichiro Naito
    • Organizer
      ICM Satellite Conference 2014: The Fourth Asian Conference on Nonlinear Analysis and Optimization
    • Place of Presentation
      Taiwan Normal University, Taipei, Taiwan
    • Year and Date
      2014-08-08 – 2014-08-08
  • [Presentation] Transference Principle of Simultaneous approximation problems and LLL algorithm of multidimensional p-adic approximation lattices2014

    • Author(s)
      Hirohito Inoue, Shoichi Kamada, Koichiro Naito
    • Organizer
      ICM Satellite Conference 2014: The Fourth Asian Conference on Nonlinear Analysis and Optimization
    • Place of Presentation
      Taiwan Normal University, Taipei, Taiwan
    • Year and Date
      2014-08-08 – 2014-08-08
  • [Presentation] Entropy and recurrent dimensions of discrete quasi-periodic dynamical systems given by p-adic expansions2014

    • Author(s)
      Hirohito Inoue, Koichiro Naito
    • Organizer
      ICM Satellite Conference 2014: The Fourth Asian Conference on Nonlinear Analysis and Optimization
    • Place of Presentation
      Taiwan Normal University, Taipei, Taiwan
    • Year and Date
      2014-08-08 – 2014-08-08
    • Invited
  • [Presentation] Shortest vector problems in p-adic lattices and simultaneous approximation problems of p-adic numbers2014

    • Author(s)
      Hirohito Inoue, Koichiro Naito
    • Organizer
      ICM Satellite Conference 2014: The Fourth Asian Conference on Nonlinear Analysis and Optimization
    • Place of Presentation
      Taiwan Normal University, Taipei, Taiwan
    • Year and Date
      2014-08-08 – 2014-08-08
  • [Presentation] Regularity for the p-harmonic map heat flows2014

    • Author(s)
      Masashi Misawa
    • Organizer
      The 9th East Asia Partial Differential Equations Conference
    • Place of Presentation
      ホテル日航奈良、奈良
    • Year and Date
      2014-07-28 – 2014-07-28
    • Invited

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Published: 2016-06-01  

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