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

We consider the discrete-time quantum walk whose local dynamics is denoted by $C$ at the perturbed region $\{ 0,1,…,M−1 \}$ and free at the other positions. We obtain the stationary state with a bounded initial state. The initial state is set so that the perturbed region receives the inflow $\omega^n$ at time $n$ $(|\omega |=1)$. From this expression, we compute the scattering on the surface of $−1$ and $M$ and also compute the quantity how quantum walker accumulates in the perturbed region; namely the energy of the quantum walk, in the long time limit. We find a discontinuity of the energy with respect to the frequency of the inflow.

DOI： 10.3390/sym13071134

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

We consider the time-independent scattering theory for time evolution operators of one-dimensional two-state quantum walks. The scattering matrix associated with the position-dependent quantum walk naturally appears in the asymptotic behavior at spatial infinity of generalized eigenfunctions. The asymptotic behavior of generalized eigenfunctions is a consequence of an explicit expression of the Green function associated with the free quantum walk. When the position-dependent quantum walk is a finite rank perturbation of the free quantum walk, we derive a kind of combinatorial constructions of the scattering matrix by counting paths of quantum walkers. We also mention some remarks on the tunneling effect.

DOI： 10.1142/S0129055X21500197

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

In this paper, we consider the scattering theory for acoustic-type equations on non-compact manifolds with a single flat end. Our main purpose is to show an existence result of non-scattering energies. Precisely, we show a Weyl-type lower bound for the number of non-scattering energies. Usually a scattered wave occurs for every incident wave by the inhomogeneity of the media. However, there may exist suitable wavenumbers and patterns of incident waves such that the corresponding scattered wave vanishes. We call (the square of) this wavenumber a non-scattering energy in this paper. The problem of non-scattering energies can be reduced to a well-known interior transmission eigenvalues problem.

DOI： 10.1063/1.5111890

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

We consider a position-dependent quantum walk on ${\bf Z}$. In particular, we derive a detection method for edge defects by embedded eigenvalues of its time evolution operator. In the present paper, an edge defect is a set $\{ y - 1,y \} $ for $y\in {\bf Z}$, in which the coin operator is an anti-diagonal matrix. In fact, under some suitable assumptions, the existence of a finite number of edge defects is equivalent to the existence of embedded eigenvalues of the time evolution operator. In view of applications, by checking the spectrum, we can detect the existence of disconnecting edge (in the sense of edge defects above) on the line without directly watching it.

DOI： 10.1007/s11128-019-2398-z

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

We study the spectral analysis and the scattering theory for time evolution operators of position-dependent quantum walks. Our main purpose of this paper is construction of generalized eigenfunctions of the time evolution operator. Roughly speaking, the generalized eigenfunctions are not square summable but belong to $\ell^{\infty}$-space on ${\bf Z}$. Moreover, we derive a characterization of the set of generalized eigenfunctions in view of the time-harmonic scattering theory. Thus we show that the S-matrix associated with the quantum walk appears in the singularity expansion of generalized eigenfunctions.

DOI： 10.1142/S0129055X19500193

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

© 2018, Springer Nature Switzerland AG. We study the inverse scattering for Schrödinger operators on locally perturbed periodic lattices. We show that the associated scattering matrix is equivalent to the Dirichlet-to-Neumann map for a boundary value problem on a finite part of the graph, and reconstruct scalar potentials as well as the graph structure from the knowledge of the S-matrix. In particular, we give a procedure for probing defects in hexagonal lattices (graphene).

DOI： 10.1007/s00023-018-0721-3

Scopus

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

We study the spectral properties of Schr\"{o}dinger operators on perturbed lattices. We shall prove the non-existence or the discreteness of embedded eigenvalues, the limiting absorption principle for the resolvent, construct a spectral representation, and define the S-matrix. Our theory covers the square, triangular, diamond, Kagome lattices, as well as the ladder, the graphite and the subdivision of square lattice.

DOI： 10.1007/s00023-015-0430-0

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

© Association des Annales de l'institut Fourier, 2015. We study an inverse scattering problem for the discrete Schrödinger operator on the square lattice ℤ, d ≥ 2, with compactly supported potential. We show that the potential is uniquely reconstructed from a scattering matrix for a fixed energy.

DOI： 10.5802/aif.2954

Scopus

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

An analogue of Rellich's theorem is proved for discrete Laplacian on square lattice, and applied to show unique continuation property on certain domains as well as non-existence of embedded eigenvalues for discrete Schr{\"o}dinger operators.

DOI： 10.3934/ipi.2014.8.475

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

We consider an inverse boundary value problem for a discrete Schrödinger operator −Δ+q ˆ on a bounded domain in the square lattice. We define an analogue of the Dirichlet-to-Neumann map, and give a reconstruction procedure of the potential q ˆ from the D-to-N map for all energies.

DOI： 10.3934/ipi.2011.5.715

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Language：English   Publishing type：Internal/External technical report, pre-print, etc.  

We have decided to remain this preprint to be unpublished. March 31, 2019.

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)  

The theory of inverse boundary value problems has been used in fields of engineering and physics such as non-destructive testing, medical imaging. <br />
Calder\&#039;{o}n&#039;s inverse problem for an elliptic partial differential equation appears in electrical impedance tomography (EIT).<br />
EIT is one of techniques for medical imaging.<br />
One can infer inside of human body by the surface electrode measurements. <br />
Mathematically, this technique corresponds to the reconstruction of the electrical conductivity from boundary measurements.<br />
One of theoretical models of boundary measurements is the Dirichlet-to-Neumann map.<br />
In the present paper, we consider a discrete analogue of Calder\&#039;{o}n&#039;s inverse problem.<br />
Namely, we derive a reconstruction procedure of conductivity on circular resistor networks from the Dirichlet-to-Neumann map.<br />
A numerical example of perturbation of the Dirichlet-to-Neumann map is also given in this paper.

DOI： 10.14988/pa.2018.0000000166

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Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (bulletin of university, research institution)  

In this paper, we study an approximate motion planning on the one dimensional plate equation by boundary control using Gevrey class functions.

DOI： 10.14988/pa.2017.0000016913

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Language：Japanese   Publishing type：Research paper, summary (international conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (international conference)  

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Language：Japanese   Publishing type：Research paper, summary (international conference)  

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Event date： 2024.6

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Osaka Metropolitan University   Country：Japan  

鉱物や岩石の物質特性を超音波による非破壊検査で決定する実験においては, パルス状の入射波に対し, 反射波を計測し,標本長と伝播時間の関係から標本固有の波速度を決定する. この際, 実験系のスケールでは, 標本を実験装置に固定するための接合材層(bond)による影響を無視できない. この影響を補正するため, 従来 bond correction method と呼ばれる方法が用いられているが, この定式化には数学的に疑問の余地があり, また実験的にも今日に至るまで補正手段の検討が続けられている.最近, 数物協働で波動方程式による解析に基づいてこの補正法の再検討を始めており, 本講演では現状についてご報告したい.

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Event date： 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Okayama University of Science   Country：Japan  

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Event date： 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Okayama University of Science   Country：Japan  

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Event date： 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Okayama University of Science   Country：Japan  

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Event date： 2023.11

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Tsukuba International Congress Center   Country：Japan  

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Event date： 2023.9

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Universidad de Santiago de Chile   Country：Chile  

Some properties of resonances for multi-dimensional quantum walks are studied. Resonances for quantum walks are defined as eigenvalues of complex translated time evolution operators in the pseudo momentum space. A quantum walk with a non-penetrable barrier has some eigenvalues. We can see an instability of eigenvalues undera perturbation of the non-penetrable barrier. However, we also see the stability as resonance poles. This is an analogue of shape resonance model for Schrodinger operators. This is a joint work with Kenta Higuchi (Ehime University / JSPS research fellow PD).

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Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Tohoku University   Country：Japan  

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Event date： 2023.9

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：RIMS   Country：Japan  

Some properties of resonances for multi-dimensional quantum walks are studied. Resonances for quantum walks are defined as eigenvalues of complex translated time evolution operators in the pseudo momentum space. A quantum walk with a non-penetrable barrier has some eigenvalues. We can see an instability of eigenvalues under a perturbation of the non-penetrable barrier. However, we also see the stability as resonance poles. This is an analogue of shape resonance model for Schrödinger operators. This is a joint work with Kenta Higuchi (Ehime University / JSPS research fellow PD).

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Event date： 2023.5

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：RIMS   Country：Japan  

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Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：Kagawa University   Country：Japan  

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Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Chuo Unviersity   Country：Japan  

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Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Chuo Unviersity   Country：Japan  

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Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Chuo Unviersity   Country：Japan  

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Event date： 2023.1

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：Osaka University  

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Event date： 2022.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ehime University   Country：Japan  

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Event date： 2022.11

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Osaka University   Country：Japan  

平行移動周期的であるような格子上の離散シュレーディンガー作用素の固有値問題を考える. 特に, ポテンシャルが台有限個もしくは指数的減衰の条件を満たす場合に, 連続スペクトル内部に埋め込まれた固有値が存在するか, という問題に着目する. 摂動が短距離型条件を満たすとき, ユークリッド空間または適当な条件下で散乱理論が成り立つ非コンパクト多様体の場合には, この種の埋蔵固有値が存在しないことが知られており, その証明には一般化固有関数に対するアプリオリな減衰度の評価と一意接続原理が重要な役割を果たす. 格子上の離散シュレーディンガー作用素の場合, これらの問題は全く自明ではなく, 格子の構造に強く依存することが分かっている. Isozaki-Morioka (2014) とAndo-Isozaki-Morioka (2015) でいくつかの典型的な例についてこれらの問題は調べられてきたが, 本講演ではできる限り一般的な枠組みでどこまでのことが分かるのかについて述べる. さらに, 現時点で未解決な問題と, その内容についても言及したい. 本講演は, 安藤和典氏(愛媛大学), 磯崎洋氏(筑波大学名誉教授)との共同研究である.

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Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Hokkaido University   Country：Japan  

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Event date： 2022.1

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Metric graphは, 各辺上で常微分作用素を定義し, 各頂点で適当な境界条件を与えたグラフである. 本講演では六角格子の各辺上で対称な実数値ポテンシャルを伴うシュレーディンガー作用素を考え, 典型的な境界条件であるキルヒホフ条件を与える. 六角格子上の適当な有界領域においてディリクレ-ノイマン写像（D-N map）を定義し, D-N mapからポテンシャルを再構成する逆問題に関する結果を述べる. 時間が許せば, 六角格子上の逆散乱問題との関係についても述べたい. 本講演の内容は, 安藤和典氏（愛媛大学）, 磯崎洋氏（筑波大学名誉教授）, Evgeny Korotyaev氏（St. Petersburg Univ.）との共同研究に基づいている.

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Event date： 2022.1

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Country：Japan  

Metric graph は，各辺上で常微分作用素を定義し，各頂点で適当な境界条件を与えたグラフである．本講演では六角格子の各辺上で対称な実数値ポテンシャルを伴うシュレーディンガー作用素を考え，典型的な境界条件であるキルヒホフ条件を与える．本講演では，六角格子上の適当な有界領域においてディリクレ－ノイマン写像 (D-N map) を定義し，D-N map からポテンシャルを再構成する逆問題に関する結果を述べる．本講演の内容は，安藤和典氏（愛媛大学），磯崎洋氏（筑波大学名誉教授），Evgeny Korotyaev 氏（St. Petersburg Univ.）との共同研究に基づいている．

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Event date： 2021.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：online meeting  

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Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Chiba University (Online meeting)   Country：Japan  

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Event date： 2021.1

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：Online  

Joint work with Takashi Komatsu, Norio Konno and Etsuo Segawa.

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Event date： 2020.12

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：online meeting   Country：Japan  

Joint work with N. Shoji.

File： sogo_morioka.pdf

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Event date： 2020.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：online meeting  

Speaker : Takashi Komatsu

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Event date： 2020.7

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：online meeting  

1次元2状態量子ウォークに対して一般化固有関数を構成し, その中に含まれる散乱行列を考える. 散乱行列は, 散乱理論の一般論としては既によく知られた対象であるが, 本講演では, 有限次元摂動を持つ量子ウォークの場合に, ある種の組み合わせ論的な議論を行うことで散乱行列の明示公式を構成できることを示す. このことは. 長時間後における量子ウォーカーのパスの数え上げを行うことに相当する. 本講演は, 小松堯氏, 今野紀雄氏, 瀬川悦生氏との共同研究による.

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Event date： 2020.2

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ehime University   Country：Japan  

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Language：English   Presentation type：Oral presentation (general)  

Venue：University of Tsukuba  

Joint works with Kazunori Ando (Ehime University) and Hiroshi Isozaki (University of Tsukuba).

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Yokohama National University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：University of Tsukuba  

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Kobe University  

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Language：English   Presentation type：Oral presentation (general)  

Venue：BKC, Ritsumeikan University  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Piazza Omi, Otsu  

Joint work with Naotaka Shoji (Univ. of Tsukuba).

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Language：English   Presentation type：Oral presentation (invited, special)  

Venue：National Center for Theoretical Sciences in National Taiwan University  

Joint work with K. Ando and H. Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ryukoku University  

This is a joint work with Kazunori Ando and Hiroshi Isozaki.

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Language：Japanese  

Venue：数理解析研究所  

File： op_seminar1015.pdf

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：龍谷大学  

File： ouyou_goudou.pdf

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学  

File： mcyr7.pdf

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Osaka University  

This is a jointed work with Prof. H. Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Tsukuba city, Ibaraki, Japan  

This is a jointed work with Prof. H. Isozaki.

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Kumamoto  

This is a jointed work with Prof. H. Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Hokkaido University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Niigata University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Kyushu University  

File： rellich_view.pdf

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Kyushu University  

File： isp_view.pdf

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Language：English   Presentation type：Oral presentation (general)  

Venue：Southeast University, Nanjing, China  

This is a jointed work with H. Isozaki.

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Language：English   Presentation type：Oral presentation (general)  

Venue：Research Institute for Mathematical Sciences, Kyoto University  

This is a jointed work with H. Isozaki.

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Language：English   Presentation type：Oral presentation (general)  

Venue：Research Institute for Mathematical Sciences  

This is a jointed work with H. Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ehime University  

This talk is based on joint works with Hiroshi Isozaki, and with Kazunori Ando.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：University of Tokyo  

This talk is based on joint works with Hiroshi Isozaki, and with Kazunori Ando.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：University of Tsukuba  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Hiroshima University  

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Gakushuin University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Shinsyu University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ryukoku University  

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Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：University of Tsukuba, Japan  

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：筑波大学  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学 数理解析研究所  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学  

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Language：English   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Inha University (Incheon, Korea)  

Joint work with Naotaka Shoji.

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Ehime University  

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Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：RIMS  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Tambara Institute of Mathematical Sciences  

Joint work with Naotaka Shoji.

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：University of Tokyo  

2019/8/23-25

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：和歌山ビッグ愛  

Joint work with Naotaka Shoji.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Kanazawa University  

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Language：English   Presentation type：Oral presentation (general)  

Venue：RIMS  

Joint work with Naotaka Shoji.

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Language：English   Presentation type：Oral presentation (general)  

Venue：Gakushuin University  

Joint work with Naotaka Shoji.

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Language：English   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：RIMS  

This is a joint work with Naotaka Shoji.

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Language：English   Presentation type：Oral presentation (general)  

Venue：RIMS  

Joint work with Kazunori ANDO (Ehime Univ.) and Hiroshi ISOZAKI (Prof. Emeritus, Univ. of Tsukuba).

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Language：English   Presentation type：Oral presentation (general)  

Venue：Kansai Seminar House  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：伊勢市観光文化会館  

Joint work with Kazunori Ando and Hiroshi Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Yamagata University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Tottori University  

Joint work with Kazunori Ando and Hiroshi Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ehime University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ryukoku University  

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Language：English   Presentation type：Oral presentation (general)  

Venue：RIMS  

This is a joint work with Shouta Mori and Hideki Takuwa.

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Language：English   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Hokkaido University  

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Language：English   Presentation type：Oral presentation (invited, special)  

Venue：University of Tsukuba  

Joint work with N. Shoji.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Tokushima city  

Joint work with Etsuo Segawa (Tohoku University).

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Language：English   Presentation type：Oral presentation (general)  

Venue：University of Tokyo  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Okayama University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州市立男女共同参画センター・ムーブ  

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Yokohama National University  

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Ehime University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ryukoku  

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Language：English   Presentation type：Oral presentation (general)  

Venue：AIMR, Tohoku University  

This is a joint work with Kazunori Ando and Hiroshi Isozaki.

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Language：English   Presentation type：Oral presentation (general)  

Venue：RIMS  

Joint work with Naotaka Shoji (Kaichi-Mirai Junior and Senior High School).

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Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：Tokyo Institute of Technology  

Joint work with N. Shoji (Kaichi-Mirai Junior and Senior High School).

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Niigata  

This is a joint work with Kazunori Ando and Hiroshi Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Nagahama city  

This is a joint work with Kazunori Ando and Hiroshi Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Tohoku university  

This is a joint work with Kazunori Ando and Hiroshi Isozaki.

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Language：English   Presentation type：Oral presentation (general)  

Venue：RIMS, Kyoto  

This is a joint work with Kazunori Ando and Hiroshi Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ピアザ淡海 (Otsu)  

Joint work with K. Ando and H. Isozaki.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ryukoku University  

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Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Nagoya University  

This talk is based on a joint work with K. Ando and H. Isozaki.

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Language：English   Presentation type：Oral presentation (general)  

Venue：China National Convention Center  

We talk about the spectral properties of Schroedinger operators on perturbed lattices. The main topics are the non-existence or the discreteness of embedded eigenvalues, the limiting absorption principle for the resolvent, spectral representations, the S-matrix and the associated inverse problems. Our theory covers the square, triangular, diamond, Kagome lattices, as well as the ladder, the graphite and the subdivision.

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Kumamoto University  

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Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：RIMS  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：フェニックスプラザ(Fukui)  

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Language：Japanese   Presentation type：Poster presentation  

Venue：University of Tokyo  

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Organizer, Feb. 20, 2020, Ehime University.
https://mkawa072676.wixsite.com/k-seminar/theater-1

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Organizer
January 31 - February 1, 2020.
http://www.math.sci.ehime-u.ac.jp/~analysis-seminar/matsuyama.html

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Organizer
December 21-22, 2019
https://sites.google.com/view/matsuyamaspectrum2019/

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Organizer
September 9-11, 2019
https://sites.google.com/view/rims2019geomspec/

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http://www.math.sci.ehime-u.ac.jp/~analysis-seminar/
April 2019-

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https://sites.google.com/view/specscattimadegawa2019/

Organizing committee

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https://bit.ly/2FrZQ2u

Organizer

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https://sites.google.com/site/macmpimadegawa2017/index/home

Organizer

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Organizing committee

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http://sgw2013.imi.kyushu-u.ac.jp/index.html

S.G. of NIPPON STEEL & SUMITOMO METAL CORPORATION

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http://www.ms.u-tokyo.ac.jp/gcoe/SGW.html

新日鉄住金グループ参加

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