Oishi-Tomiyasu Ryoko

Affiliation and department：
Homepage URL (2)： https://imi.kyushu-u.ac.jp/~tomiyasu/index_jp.html , https://imi.kyushu-u.ac.jp/~tomiyasu/index.html

Research field (2)： Algebra , Applied mathematics and statistics

Research keywords (6)： mathematical crystallography , number theory , lattice , quadratic form , algorithm , discrete mathematics

Research theme for competitive and other funds (4)：

2022 - 2025 生物由来の新しいパッキング生成法による離散モデリング
2019 - 2024 study on discrete point sets to produce new applications of lattice theory and algebraic computation
2018 - 2021 Upgrading of the Fourier and global optimization techniques used in material structure analysis
2014 - 2018 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

Papers (17)：

Ramanujam Kamaraj, Ben Kane, Ryoko Oishi-Tomiyasu. Universal sums of generalized heptagonal numbers. JOURNAL OF NUMBER THEORY. 2023. 249. 500-536
Ryoko Oishi-Tomiyasu, Tomohito Tanaka, Junichi Nakagawa. Distribution rules of systematic absences and generalized de Wolff figures of merit applied to electron backscatter diffraction ab initio indexing. Journal of Applied Crystallography. 2021. 54. 624-635
Ryoko Oishi-Tomiyasu. Mathematical Tools that Connect Different Indexing Analyses. Proceedings. 2020
Ryoko Oishi-Tomiyasu. Positive-definite ternary quadratic forms with the same representations over Z. International Journal of Number Theory. 2020. 16. 7. 1493-1534
K Tomiyasu, R Oishi-Tomiyasu, M Matsuda, K Matsuhira. A new mathematical approach to finding global solutions of the magnetic structure determination problem. Scientific reports. 2018. 8. 1. 16228-16228

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MISC (21)：

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Patents (1)：

Lectures and oral presentations (5)：

A method to obtain all geometrical ambiguities in powder indexing
(IUCr2014 2014)
粉末指数付けソフトCONOGRAPHに導入された新しい関数について
(日本結晶学会年会講演要旨集 2014)
結晶学の格子決定問題(粉末指数づけ)への格子簡約理論の応用
(日本応用数理学会年会講演予稿集 2012)
Algorithm and performance of new powder indexing software Conograph
(IUCr2011 2011)
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
(日本結晶学会年会講演要旨集 2011)

Works (5)：

EBSD ab-initio indexing software
2020 - 現在
Rietveld analysis software Z-Rietveld
2013 - 現在
Powder indexing software Conograph (auto-indexing, ab-initio indexing)
2013 - 現在
Peak search program for (X,Y) data
Ryoko Oishi-Tomiyasu 2013 -
Rapid and error-stable Bravais lattice determination algorithm
2013 -

Education (2)：

2000 - 2005 The University of Tokyo Graduate School of Mathematical Sciences
1998 - 2000 The University of Tokyo Faculty of Science Department of Mathematics

Professional career (1)：

Work history (7)：

2019 - 2022 Kyushu University Institute of Mathematics for Industry Associate Professor
2016 - 2018 Yamagata University Faculty of Science Associate Professor
2015 - 2016 Tohoku University AIMR (Math unit) JST PRESTO researcher
2011 - 2015 High energy accelerator research organization Institute of Materials Structure Science Fixed-term Assistant Professor
2008 - 2011 High energy accelerator research organization Institute of Materials Structure Science Research Fellow

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Committee career (3)：

2017 - 現在 International Union of Crystallography Commission on Mathematical and Theoretical Crystallography
2020/10 - 2026/09 The Science Council of Japan Associate members
2023/09 - 2025/08 RIMS, Kyoto University Technical Committee

Awards (2)：

Association Membership(s) (3)：

THE CRYSTALLOGRAPHIC SOCIETY OF JAPAN , THE JAPAN SOCIETY FOR INDUSTRIAL AND APPLIED MATHEMATICS , THE MATHEMATICAL SOCIETY OF JAPAN

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