Updated on 2024/11/29

Information

 

写真a

 
TOMIYASU RYOKO
 
Organization
Institute of Mathematics for Industry Division for Intelligent Societal Implementation of Mathmatical Computation Professor
School of Sciences Department of Mathematics（Concurrent）
Graduate School of Mathematics Department of Mathematics（Concurrent）
Joint Graduate School of Mathematics for Innovation （Concurrent）
Title
Professor
Contact information
メールアドレス
Profile
In order to create applications of algebra and number theory and to solve problems in mathematical crystallography, I am particularly interested in developing theories and methods for packing, applied algebra and applied harmonic analysis. Since I have developed methods for solving problems in crystallography using tools from my area of expertise (lattice and quadratic forms) and the field of global optimization (semidefinite programming), I am also working on interdisciplinary and industrial collaborations.
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External link

Research Areas

  • Natural Science / Applied mathematics and statistics

  • Natural Science / Algebra

Degree

  • Mathematical sciences (The University of Tokyo, 2010)

Research History

  • Kyushu University Institute of Mathematics for Industry Associate Professor

    2019 - 2022

    　 More details

  • 山形大学　理学部　准教授　2015--2018 高エネルギー加速器研究機構　物質構造科学研究所　特任助教2011--2014

Research Interests・Research Keywords

  • Research theme：discrete mathematics

    Keyword：discrete mathematics

    Research period： 2024

  • Research theme：lattice

    Keyword：lattice

    Research period： 2024

  • Research theme：number theory

    Keyword：number theory

    Research period： 2024

  • Research theme：mathematical crystallography

    Keyword：mathematical crystallography

    Research period： 2024

  • Research theme：quadratic form

    Keyword：quadratic form

    Research period： 2024

  • Research theme：algorithm

    Keyword：algorithm

    Research period： 2024

Awards

  • 第6回藤原洋数理科学賞奨励賞

    2017.9   新しい粉末指数づけアルゴリズムの研究

  • 2011年度結晶学会ポスター賞

    2011.11   日本結晶学会   新しい粉末指数づけアルゴリズムとその実行結果について

Papers

  • Ideas of lattice-basis reduction theory for error-stable Bravais lattice determination and abinitio indexing

    Oishi-Tomiyasu R.

    Acta Crystallographica Section A: Foundations and Advances   80 ( Pt 4 )   339 - 350   2024.7

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    Publisher：Acta Crystallographica Section A: Foundations and Advances  

    In abinitio indexing, for a given diffraction/scattering pattern, the unit-cell parameters and the Miller indices assigned to reflections in the pattern are determined simultaneously. 'Ab initio' means a process performed without any good prior information on the crystal lattice. Newly developed abinitio indexing software is frequently reported in crystallography. However, it is not widely recognized that use of a Bravais lattice determination method, which is tolerant of experimental errors, can simplify indexing algorithms and increase their success rates. One of the goals of this article is to collect information on the lattice-basis reduction theory and its applications. The main result is a Bravais lattice determination algorithm for 2D lattices, along with a mathematical proof that it works even for parameters containing large observational errors. It uses two lattice-basis reduction methods that seem to be optimal for different symmetries, similarly to the algorithm for 3D lattices implemented in the CONOGRAPH software. In indexing, a method for error-stable unit-cell identification is also required to exclude duplicate solutions. Several methods are introduced to measure the difference in unit cells known in crystallography and mathematics.

    DOI： 10.1107/S2053273324004418

    Scopus

  • Packing Theory Derived from Phyllotaxis and Products of Linear Forms

    Graiff Zurita S.E., Oishi-Tomiyasu R.

    Constructive Approximation   2024   （ ISSN:01764276 ）

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    Publisher：Constructive Approximation  

    Parastichies are spiral patterns observed in plants and numerical patterns generated using golden angle method. We generalize this method using Markoff theory and the theory of product of linear forms, to obtain a packing theory on Riemannian manifolds of general dimensions n with a locally diagonalizable metric, including the Euclidean spaces. From the theory, point packings on a plane with logarithmic spirals and on a 3D ball (3D analogue of the Vogel spiral) are newly obtained. We prove that the method is applicable to generate almost uniformly distributed point sets on any smooth Riemannian surfaces in a local sense. We also discuss how to extend it to a global packing in some special cases including the case of packing on a disc such as the Vogel spiral. The packing density is bounded below by approximately 0.7 for surfaces and 0.38 for 3-manifolds under the most general assumption.

    DOI： 10.1007/s00365-024-09691-3

    Scopus

  • Universal sums of generalized heptagonal numbers

    Ramanujam Kamaraj, Ben Kane, Ryoko Oishi-Tomiyasu

    JOURNAL OF NUMBER THEORY   249   500 - 536   2023.8   （ ISSN:0022-314X eISSN:1096-1658 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ACADEMIC PRESS INC ELSEVIER SCIENCE  

    In this paper, we consider representations of integers as sums of heptagonal numbers with a prescribed number of repeats of each heptagonal number appearing in the sum. In particular, we investigate the classification of such sums which are universal, i.e., those that represent every positive integer. We prove an explicit finite bound such that a given sum is universal if and only if it represents positive integer up to the given bound. (c) 2023 Elsevier Inc. All rights reserved.

    DOI： 10.1016/j.jnt.2023.02.003

    Web of Science

    Scopus

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  • Distribution rules of systematic absences and generalized de Wolff figures of merit applied to electron backscatter diffraction ab initio indexing

    Ryoko Oishi-Tomiyasu, Tomohito Tanaka, Junichi Nakagawa

    Journal of Applied Crystallography   54   624 - 635   2021.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600576721002120

  • Mathematical Tools that Connect Different Indexing Analyses Reviewed International journal

    R. Oishi-Tomiyasu

    MDPI Proceedings (IOCC2020 proceedings)   62 ( 1 )   1 - 8   2020.12

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： https://doi.org/10.3390/proceedings2020062008

  • Positive-definite ternary quadratic forms with the same representations over ℤ Reviewed

    16 ( 7 )   1493 - 1534   2020.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    Kaplansky conjectured that if two positive-definite ternary quadratic forms have perfectly identical representations over ℤ, they are equivalent over ℤ or constant multiples of regular forms, or is included in either of two families parameterized by ℝ2. Our results aim to clarify the limitations imposed to such a pair by computational and theoretical approaches. First, the result of an exhaustive search for such pairs of integral quadratic forms is presented in order to provide a concrete version of the Kaplansky conjecture. The obtained list contains a small number of non-regular forms that were confirmed to have the identical representations up to 3,000,000 by computation. However, a strong limitation on the existence of such pairs is still observed, regardless of whether the coefficient field is ℚ or ℝ. Second, we prove that if two pairs of ternary quadratic forms have the identical simultaneous representations over ℚ, their constant multiples are equivalent over ℚ. This was motivated by the question why the other families were not detected in the search. In the proof, the parametrization of quartic rings and their resolvent rings by Bhargava is used to discuss pairs of ternary quadratic forms.

    DOI： 10.1142/S1793042120500785

  • A new mathematical approach to finding global solutions of the magnetic structure determination problem Reviewed

    K. Tomiyasu, Ryoko Tomiyasu, M. Matsuda, K. Matsuhira

    Scientific reports   8 ( 1 )   2018.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s41598-018-34443-2

  • Z-MEM, Maximum Entropy Method software for electron/nuclear density distribution in Z-Code Reviewed

    Yoshihisa Ishikawa, Junrong Zhang, Ryoji Kiyanagi, Masao Yonemura, Takeshi Matsukawa, Akinori Hoshikawa, Toru Ishigaki, Shuki Torii, Ryoko Tomiyasu, Takashi Kamiyama

    Physica B: Condensed Matter   551   472 - 475   2018.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.physb.2018.03.034

  • Application of convex optimization to identification of atomic species from diffraction patterns Reviewed

    Ryoko Tomiyasu

    Powder Diffraction   32 ( S1 )   S179 - S185   2017.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1017/S0885715616000804

  • New functions and graphical user interface attached to powder indexing software Reviewed

    A. Esmaeili, T. Kamiyamaa, Ryoko Tomiyasu

    Journal of Applied Crystallography   50   651 - 659   2017.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600576717001145

  • A table of geometrical ambiguities in powder indexing obtained by exhaustive search Reviewed

    Ryoko Tomiyasu

    Acta Crystallographica Section A: Foundations and Advances   72   73 - 80   2016.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S2053273315021725

  • Erratum Distribution rules of systematic absences on the Conway topograph and their application to powder auto-indexing (Acta Crystallographica Section A: Foundations and Advances (2013) A69 (603-610)) Reviewed

    Ryoko Tomiyasu

    Acta Crystallographica Section A: Foundations and Advances   71   2015.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S2053273315015065

  • Method to generate all the geometrical ambiguities of powder indexing solutions Reviewed

    R. Oishi-Tomiyasu

    Journal of Applied Crystallography   47 ( 6 )   2055 - 2059   2014.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600576714023620

  • Robust powder auto-indexing using many peaks Reviewed

    R. Oishi-Tomiyasu

    Journal of Applied Crystallography   47 ( 2 )   593 - 598   2014.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600576714000922

  • Improvement of instrument devices for super high resolution powder diffractometer at J-PARC Reviewed

    S. Torii, M. Yonemura, Y. Ishikawa, P. Miao, Ryoko Tomiyasu, S. Satoh, Y. Noda, T. Kamiyama

    1st Conference on Light and Particle Beams in Materials Science 2013, LPBMS 2013 Journal of Physics: Conference Series   502 ( 1 )   2014.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1088/1742-6596/502/1/012052

  • Distribution rules of systematic absences on the Conway topograph and their application to powder auto-indexing Reviewed

    R. Oishi-Tomiyasu

    Acta Crystallographica Section A: Foundations of Crystallography   69 ( 6 )   603 - 610   2013.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S0108767313021740

  • Reversed de Wolff figure of merit and its application to powder indexing solutions Reviewed

    R. Oishi-Tomiyasu

    Journal of Applied Crystallography   46 ( 5 )   1277 - 1282   2013.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S0021889813018773

  • Rapid Bravais-lattice determination algorithm for lattice parameters containing large observation errors Reviewed

    R. Oishi-Tomiyasu

    Acta Crystallographica Section A: Foundations of Crystallography   68 ( 5 )   525 - 535   2012.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S0108767312024579

  • Application of matrix decomposition algorithms for singular matrices to the Pawley method in Z-Rietveld Reviewed

    R. Oishi-Tomiyasu, M. Yonemura, T. Morishima

    Journal of Applied Crystallography   45 ( 2 )   299 - 308   2012.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S0021889812003998

  • Super high resolution powder diffractometer at J-PARC Reviewed

    Shuki Torii, Masao Yonemura, Teguh Yulius Surya Panca Putra, Junrong Zhang, Ping Miao, Takashi Muroya, Ryoko Tomiyasu, Takahiro Morishima, Setsuo Sato, Hidenori Sagehashi, Yukio Noda, Takashi Kamiyama

    journal of the physical society of japan   80 ( SUPPL. B )   2011.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1143/JPSJS.80SB.SB020

  • On some algebraic properties of CM-types of CM-fields and their reflexes Reviewed

    Ryoko Oishi-Tomiyasu

    Journal of Number Theory   130 ( 11 )   2442 - 2466   2010.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.jnt.2010.03.021

  • New approach to the indexing of powder diffraction patterns using topographs Reviewed

    Ryoko Tomiyasu, M. Yonemura, A. Hoshikawa, T. Ishigaki, K. Mori, S. Torii, T. Morishima, T. Kamiyama

    Zeitschrift fur Kristallographie, Supplement   ( 30 )   15 - 20   2009.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1524/zksu.2009.0002

  • IBARAKI materials design diffractometer (iMATERIA)-Versatile neutron diffractometer at J-PARC Reviewed

    T. Ishigaki, A. Hoshikawa, M. Yonemura, T. Morishima, T. Kamiyama, Ryoko Tomiyasu, K. Aizawa, T. Sakuma, Y. Tomota, M. Arai, M. Hayashi, K. Ebata, Y. Takano, K. Komatsuzaki, H. Asano, Y. Takano, T. Kasao

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   600 ( 1 )   189 - 191   2009.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.nima.2008.11.137

  • Rietveld analysis software for J-PARC Reviewed

    Ryoko Tomiyasu, M. Yonemura, Y. Nishimaki, S. Torii, A. Hoshikawa, T. Ishigaki, T. Morishima, K. Mori, T. Kamiyama

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   600 ( 1 )   94 - 96   2009.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.nima.2008.11.056

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Books

  • 代数的・幾何的アプローチによる離散最適化入門

    Jesús A. De Loera (著), Raymond Hemmecke (著), Matthias Köppe (著), 佐久間 雅 (翻訳), 富安 亮子 (翻訳), 八森 正泰 (翻訳), 𦚰 克志 (翻訳)（ Role： Joint translator）

    共立出版  2023.6 

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    Language：Japanese   Book type：Scholarly book

  • 代数的・幾何的アプローチによる離散最適化入門

    De Loera, Jesús A., Hemmecke, Raymond, Köppe, Matthias, 佐久間, 雅, 富安, 亮子, 八森, 正泰, 脇, 克志

    共立出版  2023.6    （ ISBN:9784320114951 ）

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    Total pages：xx, 436p   Language：Japanese  

    CiNii Books

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MISC

  • トポグラフを用いた指数付け(ab-initio indexing)の手法とその背景にある数理のアイデア—An Ab-Initio Indexing Method Using Conway's Topograph and Mathematical Ideas Behind It—特集 結晶学とグラフ

    富安(大石) 亮子

    日本結晶学会誌 = Journal of the Crystallographic Society of Japan   2024.2

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    Language：Japanese  

  • トポグラフを用いた指数付け(ab-initio indexing)の手法とその背景にある数理のアイデア—An Ab-Initio Indexing Method Using Conway's Topograph and Mathematical Ideas Behind It—特集 結晶学とグラフ

    富安(大石) 亮子

    日本結晶学会誌 = Journal of the Crystallographic Society of Japan   66 ( 1 )   19 - 30   2024.2   （ ISSN:0369-4585 ）

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    Language：Japanese   Publisher：東京 : 日本結晶学会  

    CiNii Books

    CiNii Research

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    Other Link： https://ndlsearch.ndl.go.jp/books/R000000004-I033381817

  • 自然の書物に書かれた数学 : 結晶学と葉序とブラベー

    富安 亮子

    数理科学   2024.1

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    Language：Japanese  

  • 自然の書物に書かれた数学 : 結晶学と葉序とブラベー

    富安 亮子

    数理科学   62 ( 1 )   72 - 78   2024.1   （ ISSN:0386-2240 ）

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    Language：Japanese   Publisher：東京 : サイエンス社  

    CiNii Books

    CiNii Research

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  • 黄金角の方法の一般化による多様体のメッシュ・パターン生成法

    富安亮子

    日本応用数理学会年会講演予稿集(CD-ROM)   2022   2022   （ ISSN:1345-3378 ）

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  • 大域的最適化を用いた先進結晶構造解析 (特集 最適化の数理 : モデリングとアルゴリズム)

    富安 亮子

    数理科学   2019.11

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    Language：Japanese  

  • On determination of the structure of a periodic point set from its average theta series (保型形式とその周辺)

    富安(大石) 亮子

    数理解析研究所講究録   2017.10

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    Language：Japanese  

  • Application of convex optimization to identification of atomic species from diffraction patterns Reviewed

    Ryoko Oishi-Tomiyasu

    Powder Diffraction   2017.9

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    Language：English  

    DOI： 10.1017/S0885715616000804

  • 粉末指数付けソフトウェアCONOGRAPH

    富安亮子, 田村智志

    日本結晶学会誌   2015.4

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    Language：Japanese  

    DOI： 10.5940/jcrsj.57.129

  • Development of an Advanced Special Neutron Powder Diffractometer under Extreme Environment for Materials

    M. Yonemura, T. Fukunaga, K. Mori, T. Kamiyama, M. Nagao, Y. Ishikawa, S. Torii, Y. Onodera, R. Tomiyasu, H. Asano, T. Sakuma, T. Ishigaki, A. Hoshikawa, K. Aizawa, S. Harjo, K. Kino, Y. Idemoto, N. Kitamura, H. Arai, Y. Uchimoto

    MLF Annual Report   2014.2

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    Language：Others  

    Development of an Advanced Special Neutron Powder Diffractometer under Extreme Environment for Materials

  • 27pXZB-1 SrTi^<18>O_3強誘電相のSHRPD超高分解能粉末構造解析と分極方向(27pXZB 誘電体(ペロフスカイト,量子常誘電性,ナノ粒子,光効果),領域10(誘電体,格子欠陥,X線・粒子線,フォノン))

    野田 幸男, 石川 喜久, Zhang Junrong, 鳥居 周輝, 富安 亮子, 神山 崇, 米村 雅雄, 鬼柳 亮嗣, 伊藤 満

    日本物理学会講演概要集   2013.3

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    Language：Japanese  

  • 汎用中性子回折装置,茨城県材料構造解析装置(iMATERIA)の現状について(III)

    石垣徹, 星川晃範, 岩瀬謙二, ディアスリスニンティアス, 蘇玉華, 米村雅雄, 富安亮子, 森井幸生, 林眞琴, 神山崇

    日本結晶学会年会講演要旨集   2012.10

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    Language：Japanese  

  • Super high resolution powder diffractometer at J-PARC Reviewed

    Shuki Torii, Masao Yonemura, Teguh Yulius Surya Panca Putra, Junrong Zhang, Ping Miao, Takashi Muroya, Ryoko Tomiyasu, Takahiro Morishima, Setsuo Sato, Hidenori Sagehashi, Yukio Noda, Takashi Kamiyama

    Journal of the Physical Society of Japan   2011.12

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    Language：English  

    DOI： 10.1143/JPSJS.80SB.SB020

  • Rietveld analysis software for J-PARC Reviewed

    R. Oishi, M. Yonemura, Y. Nishimaki, S. Torii, A. Hoshikawa, T. Ishigaki, T. Morishima, K. Mori, T. Kamiyama

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   2009.2

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    Language：English  

    DOI： 10.1016/j.nima.2008.11.056

  • IBARAKI materials design diffractometer (iMATERIA)-Versatile neutron diffractometer at J-PARC Reviewed

    T. Ishigaki, A. Hoshikawa, M. Yonemura, T. Morishima, T. Kamiyama, R. Oishi, K. Aizawa, T. Sakuma, Y. Tomota, M. Arai, M. Hayashi, K. Ebata, Y. Takano, K. Komatsuzaki, H. Asano, Y. Takano, T. Kasao

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   2009.2

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    Language：English  

    DOI： 10.1016/j.nima.2008.11.137

  • 粉末回折装置の概要と構造科学・材料開発に与えるインパクト

    石垣 徹, 星川 晃範, 米村 雅雄, 神山 崇, 鳥居 周輝, 森嶋 隆裕, 大石 亮子

    日本結晶学会誌   2008.2

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    Language：Japanese  

    Here we describe two neutron powder diffractometers, iMATERIA and SHRPD, at the Materials and Life Science Experimental Facility in J-PARC. iMATERIA (IBARAKI Materials Design Diffractometer) has been constructed to be a high throughput versatile diffractometer enabling materials scientists to use it like a chemical analytical instrument in their material development processes. Typical measuring time to obtain &#039;Rietveld-quality&#039; data is several minutes for the sample size of laboratory X-ray diffractometer. On the other hand, SHRPD (Super High Resolution Powder Diffractometer) has been constructed by J-PARC to promote the best science using the best resolution in the world (Δd/d=0.03&#37;) . Two instruments will be ready by the Day-One.

    DOI： 10.5940/jcrsj.50.18

  • J‐PARCで迎える結晶学の新展開 1.J‐PARCで展開される中性子科学 粉末回折装置の概要と構造科学・材料開発に与えるインパクト

    石垣徹, 星川晃範, 米村雅雄, 神山崇, 鳥居周輝, 森嶋隆裕, 大石亮子

    日本結晶学会誌   2008.2

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    Language：Japanese  

    DOI： 10.5940/jcrsj.50.18

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Works

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Industrial property rights

Patent   Number of applications: 1   Number of registrations: 0
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • THE CRYSTALLOGRAPHIC SOCIETY OF JAPAN

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  • THE MATHEMATICAL SOCIETY OF JAPAN

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  • THE JAPAN SOCIETY FOR INDUSTRIAL AND APPLIED MATHEMATICS

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Committee Memberships

  • RIMS, Kyoto University   Technical Committee  

    2023.9 - 2025.8   

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    Committee type：Academic society

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  • The Science Council of Japan   Associate members  

    2020.10 - 2026.9   

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    Committee type：Government

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  • International Union of Crystallography   Commission on Mathematical and Theoretical Crystallography  

    2017 - Present   

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    Committee type：Academic society

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Academic Activities

  • Screening of academic papers

    Role(s)： Peer review

    2023

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    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：4

  • Screening of academic papers

    Role(s)： Peer review

    2018

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    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：2

Research Projects

  • Harmonic analysis for finitely many data points and its application to material structure analysis

    Grant number：24K06867  2024 - 2028

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship：Principal investigator  Grant type：Scientific research funding

    CiNii Research

  • 磁気構造解析におけるSDP解析コードの作成

    2022.1

    受託研究

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    Authorship：Principal investigator  Grant type：Other funds from industry-academia collaboration

  • 数理植物学分野では、葉序・ひまわり頭部などの形態モデリングに用いられる密なパッキングの生成方法として、黄金角によるものが知られる。応募者は、同心円状曲面に限られていたこの手法の適用範囲を一般の実解析曲面および高次元多様体を含むものに拡張した。本研究提案では、本手法を生物学・結晶学に応用した際に必要となる数学的諸問題の解決、および、理論の更なる展開に向けた数学研究を実施する。

    2022 - 2024

    創発的研究支援事業

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    Authorship：Principal investigator  Grant type：Contract research

  • study on discrete point sets to produce new applications of lattice theory and algebraic computation

    Grant number：19K03628  2019.4 - 2024.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type：Scientific research funding

    CiNii Research

  • 格子・代数計算の応用を創出する離散点集合の研究

    2019 - 2023

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Authorship：Principal investigator  Grant type：Scientific research funding

  • 物質の構造解析に用いるフーリエ解析・大域的最適化の高度化　探索研究（要素技術タイプ）課題

    2018 - 2020

    戦略的創造研究推進事業 (文部科学省)

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    Authorship：Principal investigator  Grant type：Contract research

  • 結晶学的位相問題の解を列挙する理論とソフトウェアの開発

    2015 - 2017

    戦略的創造研究推進事業 (文部科学省)

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    Authorship：Principal investigator  Grant type：Contract research

  • 大域的最適化手法を用いた新しい粉末未知構造解析アルゴリズムへのアプローチ

    2010 - 2012

    科学研究費助成事業  若手研究(B)

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    Authorship：Principal investigator  Grant type：Scientific research funding

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Educational Activities

  • Education of all aspects of mathematics in the university and the graduate school

Class subject

  • 代数学Ⅱ・演習

    2024.10 - 2025.3   Second semester

  • 数学特論A５

    2024.10 - 2025.3   Second semester

  • 応用数学D

    2024.4 - 2024.9   First semester

  • 数理科学Ⅱ

    2024.4 - 2024.9   First semester

  • 数学特論A５

    2023.10 - 2024.3   Second semester

  • 代数学Ⅱ・演習

    2023.10 - 2024.3   Second semester

  • 数学特論A５

    2022.10 - 2023.3   Second semester

  • Number Theory

    2022.4 - 2022.9   First semester

  • 数論大意

    2022.4 - 2022.9   First semester

  • 数理科学特別講義Ⅱ

    2022.4 - 2022.9   First semester

  • 数論大意

    2022.4 - 2022.9   First semester

  • 複素関数論

    2022.4 - 2022.9   First semester

  • 複素関数論

    2022.4 - 2022.9   First semester

  • 数理科学特論２

    2022.4 - 2022.9   First semester

  • 数学特論２（数論）

    2022.4 - 2022.9   First semester

  • MMA講究C

    2021.4 - 2021.9   First semester

  • 複素関数論

    2021.4 - 2021.9   First semester

  • 数学展望

    2021.4 - 2021.9   First semester

  • 複素関数論

    2020.10 - 2021.3   Second semester

  • 常微分方程式

    2020.10 - 2021.3   Second semester

  • 数理モデル概論

    2020.10 - 2021.3   Second semester

  • Mathematical Modelling

    2020.10 - 2021.3   Second semester

  • 数理モデル概論

    2020.10 - 2021.3   Second semester

  • 複素関数論

    2020.10 - 2021.3   Second semester

  • 数学ⅠＡ

    2020.10 - 2021.3   Second semester

  • 複素関数論

    2020.4 - 2020.9   First semester

  • 数論大意

    2020.4 - 2020.9   First semester

  • MMA講究C

    2020.4 - 2020.9   First semester

  • 数論大意

    2020.4 - 2020.9   First semester

  • 数学IB

    2020.4 - 2020.9   First semester

  • 複素関数論

    2020.4 - 2020.9   First semester

  • 数学特論２

    2020.4 - 2020.9   First semester

  • 数学展望

    2020.4 - 2020.9   First semester

  • 数学ⅠB

    2019.10 - 2020.3   Second semester

  • 複素関数論

    2019.10 - 2020.3   Second semester

  • 数学ⅠA

    2019.10 - 2020.3   Second semester

  • 常微分方程式（電情A）

    2019.10 - 2020.3   Second semester

  • 数学ⅠＣ

    2019.4 - 2019.9   First semester

  • 数学ⅠＢ

    2019.4 - 2019.9   First semester

  • 複素関数論（電情A）

    2019.4 - 2019.9   First semester

▼display all

FD Participation

  • 2021.7   Role：Participation   Title：数理学府FD

    Organizer：[Undergraduate school/graduate school/graduate faculty]

Outline of Social Contribution and International Cooperation activities

  • IUCr Commission consultant on Mathematical and Theoretical Crystallography (2021--2023)
    IUCr Commission member on Mathematical and Theoretical Crystallography (2017--2021)

Social Activities

  • サイエンスカフェ「数学的に美しい？」～バラ曲線とフィボナッチ～

    九州経済調査協会　ＢＩＺＣＯＬＩ サイエンスパークふくおか 九州大学　素粒子実験研究室  九州経済調査協会　BIZCOLI   2019.4

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    Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

    Type：Lecture

Media Coverage

  • 「材料研究分野で挑戦、“ゆりかごから墓場まで”データフル活用の効果」で紹介 Newspaper, magazine

    日刊工業新聞  2019.1

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    「材料研究分野で挑戦、“ゆりかごから墓場まで”データフル活用の効果」で紹介

  • 東北大と山形大など、最確の磁気構造と原子占有率を決定できる新しい実験データ解析法を開発 Newspaper, magazine

    日本経済新聞  2018.11

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    東北大と山形大など、最確の磁気構造と原子占有率を決定できる新しい実験データ解析法を開発

Travel Abroad

  • 2022.10 - 2022.12

    Staying countory name 1：Other   Staying institution name 1：The University of Hong KongUniversity of Hong Kong