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Imakura Akira

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Affiliation
Faculty of Engineering, Information and Systems
Official title
Assistant Professor
Birth date
1984-01
URL
Email
 
Research fields
High performance computing
Computational science
Research keywords
Eigenvalue problem
Linear system
Numerical Analysis
Research projects
複素モーメント型超並列固有値解析手法に対する数理的耐障害技術の開発2017-04 -- 2021-03Akira ImakuraJapan Society of for the Promotion of Science/Grant-in-Aid for Scientific Research4,030,000Yen
非線形非負行列分解を用いたディープニューラルネットワーク計算手法の開発2016-12 -- 2018-03Akira ImakuraJST/ACT-I3,900,000Yen
大規模連立一次方程式に対する反復法を用いた前処理技術の開発と科学技術計算への応用2013-04 -- 2016-03Akira ImakuraJSPS/Grant-in-Aid for Young Scientists (B)4,030,000Yen
Wavelet変換を用いての超大規模連立一次方程式の前処理の構築2009-04 -- 2011-03Akira ImakuraJSPS/Grant-in-Aid for JSPS Fellows1,400,000Yen
Career history
2013-04 -- (current)University of Tsukuba Faculty of Engineering, Information and Systems Assistant Professor
2011-04 -- 2013-03University of Tsukuba Center for Computational Sciences Research Fellow
Academic background
2008-04 -- 2011-03Nagoya University Graduate School of Engineering Department of Computational Science and EngineeringCompleted
2006-04 -- 2008-03Nagoya University Graduate School of Engineering Department of Computational Science and EngineeringCompleted
2002-04 -- 2006-03Nagoya University School of Engineering Department of Physical Science and EngineeringGraduated
Degree
2011-03Doctor of EngineeringNagoya University
Academic societies
2015-08 -- (current)SIAM
2013-06 -- (current)Information Processing Society of Japan
2008-06 -- (current)The Japan Society for Industrial and Applied Mathematics
Honors & Awards
2016-09日本応用数理学会2016年度年会 最優秀ポスター賞
2013-12今後のHPC(基盤技術と応用)に関するワークショップ 優秀講演賞
2013-05日本応用数理学会 第9回 若手優秀講演賞(2012年度)
2011-09平成23年度日本応用数理学会論文賞(応用部門)
2010-09平成22年度日本応用数理学会論文賞(ノート部門)
2008-09第3回 計算科学フロンティアフォーラム 分野別最優秀賞(アルゴリズム・CAE・一般)
2008-04The first prize for the best presentation among young participants
Articles
  • Block Krylov-type complex moment-based eigensolvers for solving generalized eigenvalue problems
    Imakura Akira; Sakurai Tetsuya
    Numer. Alg./75(2)/pp.413-433, 2017-06
  • Accuracy improvement of the Shifted Block BiCGGR method for linear systems with multiple shifts and multiple right-hand sides
    Tadano Hiroto; Saito Shusaku; Imakura Akira
    Proceedings of International Workshop on Eigenvalue Problems: Algorithms; Software and Applications, in Petascale Computing (EPASA), 2017
  • Eigenspectrum Calculation of the O(a)-improved Wilson-Dirac Operator in Lattice QCD using the Sakurai-Sugiura Method
    Suno Hiroya; Nakamura Yoshifumi; Ishikawa Ken-Ichi; Kuram...
    Proceedings of International Workshop on Eigenvalue Problems: Algorithms; Software and Applications, in Petascale Computing (EPASA), 2017
  • Core-Collapse Supernovae Explored by Multi-D Boltzmann Hydrodynamic Simulations
    Sumiyoshi Kohsuke; Nagakura Hiroki; Iwakami Wakana; Furus...
    Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016), 2017
  • Three-dimensional Boltzmann-Hydro Code for Core-collapse in Massive Stars. II. The Implementation of Moving-mesh for Neutron Star Kicks
    Nagakura Hiroki; Iwakami Wakana; Furusawa Shun; Sumiyoshi...
    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES/229(2), 2017-04
  • Improving backward stability of Sakurai-Sugiura method with balancing technique in polynomial eigenvalue problem
    Chen Hongjia; Imakura Akira; Sakurai Tetsuya
    Applications of Mathematics/62(4)/pp.357-375, 2017
  • A real-valued block conjugate gradient type method for solving complex symmetric linear systems with multiple right-hand sides
    Futamura Yasunori; Yano Takahiro; Imakura Akira; Sakurai ...
    Applications of Mathematics/62(4)/pp.333-355, 2017
  • An error resilience strategy of a complex moment-based eigensolver
    Imakura Akira; Futamura Yasunori; Tetsuya Sakurai
    Proceedings of International Workshop on Eigenvalue Problems: Algorithms; Software and Applications, in Petascale Computing (EPASA), 2017
  • Parallel implementation of the nonlinear semi-NMF based alternating optimization method for deep neural networks
    Imakura Akira; Inoue Yuto; Sakurai Tetsuya; Futamura Yasu...
    Neural Processing Letters, 2017
  • Improving the numerical stability of the Sakurai-Sugiura method for quadratic eigenvalue problems
    Chen Hongjia; Maeda Yasuyuki; Imakura Akira; Sakurai Tets...
    JSIAM Letters/9/pp.17-20, 2017-03
  • Relationships among contour integral-based methods for solving generalized eigenvalue problems
    Imakura Akira; Du Lei; Sakurai Tetsuya
    JAPAN JOURNAL OF INDUSTRIAL AND APPLIED MATHEMATICS/33(3)/pp.721-750, 2016-12
  • Alternating optimization method based on nonnegative matrix factorizations for deep neural networks
    Sakurai Tetsuya; Imakura Akira; Inoue Yuto; Futamura Yasu...
    Proceedings of the 23rd International Conference on Neural Information Processing (ICONIP 2016), LNCS 9950/pp.16-21, 2016-10
  • Locally optimal and heavy ball GMRES methods
    Imakura Akira; Li Ren-Cang; Zhang Shao-Liang
    JAPAN JOURNAL OF INDUSTRIAL AND APPLIED MATHEMATICS/33(2)/pp.471-499, 2016-07
  • Eigenspectrum Calculation of the Non-Hermitian O(a)-Improved Wilson-Dirac Operator using the Sakurai-Sugiura Method
    Kuramashi Yoshinobu; Suno Hiroya; Nakamura Yoshifumi; Ish...
    Proceedings of Science/LATTICE 2015/p.026, 2016-06
  • Development of the Shifted Block BiCGSTAB(l) Method and Improvement of Its Accuracy
    齋藤 周作; 多田野 寛人; 今倉 暁
    Transactions of the Japan Society for Industrial and Applied Mathematics/26(3)/pp.318-352, 2016
  • 19aAB-10 2D neutrino-radiation hydrodynamics simulations of core-collapse supernovae by solving 6D Boltzmann equations
    長倉 洋樹; 岩上 わかな; 住吉 光介; 古澤 峻; 松古 栄夫; 今...
    日本物理学会講演概要集/71(1)/p.168, 2016-03
  • Recovering from accuracy deterioration in the contour integral-based eigensolver
    Tetsuya Hasegawa; Imakura Akira; Tetsuya Sakurai
    JSIAM Letters/8/pp.1-4, 2016-02
  • Error bounds of Rayleigh-Ritz type contour integral-based eigensolver for solving generalized eigenvalue problems
    Imakura Akira; Du Lei; Sakurai Tetsuya
    Numerical Algorithms/71(1)/pp.103-120, 2016-01
  • A map of contour integral-based eigensolvers for solving generalized eigenvalue problems (Numerical Analysis Leading a New Age of Science and Technology)
    今倉 暁; 杜 磊; 櫻井 鉄也
    RIMS Kokyuroku/1957/pp.142-154, 2015-07
  • Filter analysis for the stochastic estimation of eigenvalue counts
    Maeda Yasuyuki; Futamura Yasunori; Imakura Akira; Sakurai...
    JSIAM Letters/7/pp.53-56, 2015-07
  • Improving the convergence behaviour of BiCGSTAB by applying D-norm minimization
    Su Lijiong; Imakura Akira; Tadano Hiroto; Sakurai Tetsuya
    JSIAM Letters/7/pp.37-40, 2015-05
  • An Efficient Algorithm to Construct an Orthonormal Basis for the Extended Krylov Subspace
    Imakura Akira
    EAST ASIAN JOURNAL ON APPLIED MATHEMATICS/4(3)/pp.267-282, 2014-08
  • A block Arnoldi-type contour integral spectral projection method for solving generalized eigenvalue problems
    Imakura Akira; Du Lei; Sakurai Tetsuya
    Applied Mathematics Letters/32/pp.22-27, 2014-06
  • Development of the Block BiCGSTAB() method for solving linear systems with multiple right hand sides
    Saito Shusaku; Tadano Hiroto; Imakura Akira
    JSIAM Letters/6/pp.65-68, 2014
  • Improvement of the accuracy of the approximate solution of the Block BiCR method
    Tadano Hiroto; Ishikawa Youichi; Imakura Akira
    JSIAM Letters/6/pp.61-64, 2014
Conference, etc.
  • 非線形非負行列因子分解に基づくディープニューラルネットワーク計算法
    今倉 暁; 櫻井 鉄也
    日本応用数理学会 第13回研究部会連合発表会/2017-03-06--2017-03-07
  • Applications of the Parallel Complex Moment-Based Eigensolver Package z-Pares to Large-Scale Scientific Computations
    Yasunori Futamura; Imakura Akira; Sakurai Tetsuya
    2017 SIAM Conference on Computational Science and Engineering/2017-02-27--2017-03-03
  • 2つのKrylov 部分空間による複素モーメント型固有値解法の改良
    今倉 暁; 櫻井 鉄也
    RIMS研究集会:現象解明に向けた数値解析学の新展開II/2016-10-19--2016-10-21
  • Alternating Optimization Method Based on Nonnegative Matrix Factorizations for Deep Neural Networks
    Sakurai Tetsuya; Imakura Akira; Inoue Yuto; Futamura Yasu...
    23rd International Conference on Neural Information Processing (ICONIP)/2016-10-16--2016-10-21
  • 複素モーメント型並列固有値解法の耐障害性とその性能評価
    今倉 暁; 櫻井 鉄也
    日本応用数理学会 2016年度 年会/2016-09-12--2016-09-14
  • Complex moment-based eigensolver using two Krylov subspaces
    Imakura Akira; Sakurai Tetsuya
    Sapporo Summer HPC Seminar 2016/2016-8-22--2016-8-22
  • Block Krylov-type complex moment-based nonlinear eigensolver with hierarchical parallelism
    Imakura Akira; Sakurai Tetsuya
    The 9th International Workshop on Parallel Matrix Algorithms and Applications (PMAA16)/2016-06-06--2016-06-08
  • Algorithm-Based Fault Tolerance of the Sakurai-Sugiura Method
    Imakura Akira; Sakurai Tetsuya
    SIAM Conference on Parallel Processing for Scientific Computing (SIAM PP16)/2016-04-12--2016-04-15
  • 6Dボルツマン・ニュートリノ輻射流体計算による2次元超新星シミュレーション
    長倉洋樹; 岩上わかな; 住吉光介; 古澤峻; 松古栄夫; 今倉 暁...
    日本物理学会 第71回年次大会(2016年)/2016-03-19--2016-03-22
  • 2つのKrylov部分空間を利用した複素モーメント型固有値解法
    今倉 暁; 櫻井 鉄也
    日本応用数理学会 第12回 研究部会連合発表会/2016-03-04--2016-03-05
  • Krylov subspace in complex moment-based eigensolver
    Imakura Akira
    Workshop on Numerical Algebra, Algorithms, and Analysis/2016-01-11--2016-01-12
  • A Contour Integral-based Parallel Eigensolver with Higher Complex Moments
    Sakurai Tetsuya; Yasunori Futamura; Imakura Akira
    SIAM Conference on Applied Linear Algebra (SIAM LA15)/2015-10-26--2015-10-30
  • A novel complex moment-based eigensolver using a communication-avoiding Arnoldi process
    Imakura Akira; Sakurai Tetsuya
    SIAM Conference on Applied Linear Algebra (SIAM LA15)/2015-10-26--2015-10-30
  • 複数右辺ベクトル・複数シフトをもつ線形方程式に対するShifted Block Krylov部分空間法の近似解の精度改善
    多田野 寛人; 齋藤 周作; 今倉 暁
    【プラズマ壁相互作用における非線形現象の理論モデル構築と画像・動画解析手法開発に関する研究会】第1回非線形・可視化部門研究会/2015-09-28--2015-09-29
  • Accuracy improvement of the Shifted Block BiCGGR method for linear systems with multiple shifts and multiple right-hand sides
    Tadano Hiroto; Saito Shusaku; Imakura Akira
    International Workshop on Eigenvalue Problems: Algorithms; Software and Applications, in Petascale Computing (EPASA2015)/2015-09-14--2015-09-16
  • Error resilience strategy of a complex moment-based eigensolver
    Imakura Akira; Futamura Yasunori; Sakurai Tetsuya
    International Workshop on Eigenvalue Problems: Algorithms; Software and Applications, in Petascale Computing (EPASA2015)/2015-09-14--2015-09-16
  • Arnoldi-type contour integral-based eigensolver for solving nonlinear eigenvalue problems
    Imakura Akira; Sakurai Tetsuya
    ICIAM 2015/2015-08-10--2015-08-14
  • 内部固有値問題のためのFEAST法に対するArnoldi/Lanczos型改良法の提案
    今倉 暁; 二村 保徳; 櫻井 鉄也
    2015年並列/分散/協調処理に関する『別府』サマー・ワークショップ (SWoPP2015)/2015-08-04--2015-08-06
  • Shifted Block BiCGSTAB(l)法の構築とその近似解の精度について
    齋藤 周作; 多田野 寛人; 今倉 暁
    第44回 数値解析シンポジウム (NAS2015)/2015-06-08--2015-06-10
  • Inherent error resilience of a complex moment-based eigensolver for solving interior eigenvalue problem
    Imakura Akira; Futamura Yasunori; Sakurai Tetsuya
    2015 LBNL - Tsukuba Joint Meeting/2015-05-28--2015-05-29
  • Fault tolerance inherent in a complex moment-based eigensolver
    Imakura Akira; Futamura Yasunori; Sakurai Tetsuya
    Sparse Solvers for Exascale: From Building Blocks to Applications/2015-03-23--2015-03-25
  • Inherent error resilience of a complex moment-based eigensolver
    Imakura Akira; Futamura Yasunori; Sakurai Tetsuya
    SIAM Conference on Computational Science and Engineering (CSE15)/2015-03-14--2015-03-18
  • Error resilience strategy of a complex moment-based eigensolver
    今倉 暁; Yasunori Futamura; Sakurai Tetsuya
    Annual Meeting on Advanced Computing System and Infrastructure (ACSI) 2015/2015-01-26--2015-01-28
  • 各種周回積分型固有値解法の関係性について
    今倉 暁; 杜 磊; 櫻井 鉄也
    2014年度 RIMS 研究集会「新時代の科学技術を牽引する数値解析学」/2014-10-08--2014-10-10
  • Communication-Avoiding Arnoldi版周回積分型固有値解法
    今倉 暁; 杜 磊; 櫻井 鉄也
    日本応用数理学会 2014年度年会/2014-09-03--2014-09-05
Teaching
2017-10 -- 2018-02Software and Computing Science Laboratory BUniversity of Tsukuba.
2017-10 -- 2017-12Computational Algorithm and SimulationUniversity of Tsukuba.
2017-10 -- 2018-02Research in Computer ScienceUniversity of Tsukuba.
2017-04 -- 2017-08Research in Computer ScienceUniversity of Tsukuba.
2017-10 -- 2018-02Computer Science Seminar BUniversity of Tsukuba.
2017-04 -- 2017-08Computer Science Seminar BUniversity of Tsukuba.
2017-10 -- 2018-02Computer Science Seminar AUniversity of Tsukuba.
2017-04 -- 2017-08Computer Science Seminar AUniversity of Tsukuba.
2017-10 -- 2017-12Computational AlgorithmsUniversity of Tsukuba.
2017-07 -- 2017-08Computer-based mathematics laboratoryUniversity of Tsukuba.
Professional activities
2016-04 -- (current)日本応用数理学会「行列・固有値問題の解法とその応用」研究部会 幹事
2014-04 -- (current)The Japan Society for Industrial and Applied MathematicsJSIAM Letters 幹事編集委員
2013-04 -- (current)The Japan Society for Industrial and Applied Mathematics「産業における応用数理」研究部会 運営委員
2012-08 -- (current)The Japan Society for Industrial and Applied Mathematics研究部会 若手の会 運営委員
2012-04 -- 2015-03The Japan Society for Industrial and Applied Mathematics学会誌「応用数理」編集委員

(Last updated: 2017-06-27)