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Kazuto Akagi AIMR, Tohoku University/NIMS
Activity Summaryof Topological Analysis Group
MI2I 最終報告会 19-20 February 2020 @一橋講堂
MaterialsresearchbyInformationIntegration”Initiative
赤木 和人(GL、東北大学) 平岡 裕章(SGL、京都大学) 小串 典子(NIMS/京都大学)
トポロジカルデータ解析の 理論・計算手法開発・応用展開
小原 真司(SGL、NIMS) 小野寺 陽平(京都大学) 田原 周太(琉球大学) 増野 敦信(弘前大学)
実験と計算機シミュレーションによる非晶質材料の作成・解析・モデリング
→ 非晶質の物性を理解するための本質的な記述の発見 → 材料データベースの基盤デザイン → 材料特性の支配要因の抽出 → HomCloud の開発、応用
トポロジカル解析グループ
小嗣 真人(東京理科大学)
トポロジカル機械学習手法の磁性材料課題への展開
HomCloud 大林・平岡
定量的で検索性が良い構造記述子を生成して 「中身が見える」逆問題アプローチを行う
vector data
! !
? ?
複雑な構造データ
組成
プロセス条件
環境の履歴
材料特性1
材料特性2
材料特性3新しい構造記述子
目指しているもの
input outputgeometric object PH�
metric info. of -dim holes�
input: hemoglobin output: persistence diagram (PD)
0 5 10 15 200
5
10
15
20
_ (birth)
_ (d
eath
)
� = 1
Yasuaki Hiraoka
connectivity, ring, cavity, ...
Persistent Homology — Mathematical tool treating “shape” of discrete data
an example for ℓ=1 (ring)b1 = 1.39 Å
(b2,d2)
(b1,d1)
Persistence diagram = Fingerprint of the "shape" in discrete data summarized as a 2-D histogram
・Born at r=b, dead at r=d ・Each (b,d) represents each "Hole" ・Robust "Hole" : apart from the diagonal line ・Noisy "Hole" : near by the diagonal line
d1 = 1.51 Åb2 = 1.52 Å d2 = 2.02 Å
Voronoi devision
Persistent Homology — Mathematical tool treating “shape” of discrete data
# of
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ers
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2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
1022123121 0materials science →
Publication on "Persistent Homology" (Web of Science)
Nakamura, H. et al. Nanotechnology 26 (2015)
−10−5
05
1015
−5
0
5
10−15
−10
−5
0
5
10
crystalliquid
05
1015
2025
05
1015
20250
5
10
15
20
25
30
glass
05
1015
2025
05
1015
20250
5
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25
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Application to SiO2
Detection of "hidden" order
Spatial ordering analysis of specific atomic groups (a kind of coarse graining)
Free volume analysis combined with positron annihilation measurement
Detection of hidden order in “amorphous” structure
Forward and Inverse Analysis based on Persistent Homology
Input Data Descriptor
・Good affinity with machine-learning
・Database of complex systems
system 1
system 2
system N
(properly translated vector data)
Atomic Configuration
Image Data
Persistence Diagram
• Extraction of hidden order
• Finding correlation with various properties • Elucidation of key structures in original data
- target: metallic glass (Pd80Si20) - identify structural changes induced from cooling rates - apply PDs to MDs for describing structures - combine ML and inverse analysis for explicitly identify those changes
PD of PCA1 (Si, dim=1)PD of PCA1 (Pd, dim=2)
Pd, dim=2
PCA1
PCA
2
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Metallic Glass: cooling rate effect on glass structures (平岡、大林、平田)
Metallic Glass: cooling rate effect on glass structures
PD of PCA1 (Si, dim=1)PD of PCA1 (Pd, dim=2)
Pd, dim=2
PCA1
PCA
2
1010K/sec<latexit sha1_base64="1JhfeohZ80x+ZW2faoPnH/ws8Ug=">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</latexit><latexit sha1_base64="1JhfeohZ80x+ZW2faoPnH/ws8Ug=">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</latexit><latexit sha1_base64="1JhfeohZ80x+ZW2faoPnH/ws8Ug=">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</latexit><latexit sha1_base64="1JhfeohZ80x+ZW2faoPnH/ws8Ug=">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</latexit>
1011K/sec<latexit sha1_base64="gmE3sXcl2cWHc3xLBPi0yYztD84=">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</latexit><latexit sha1_base64="gmE3sXcl2cWHc3xLBPi0yYztD84=">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</latexit><latexit sha1_base64="gmE3sXcl2cWHc3xLBPi0yYztD84=">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</latexit><latexit sha1_base64="gmE3sXcl2cWHc3xLBPi0yYztD84=">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</latexit>
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Inverse of PCA explicit identifies geometry affected by cooling rates!
(平岡、大林、平田)
δx δyδz
x
yz
Mg
O
Model: MgO (310) Σ5 Grain boundary
*丸のサイズ: 出現頻度
*色: 多面体のエネルギー
粒界のコストを各(bk,dk)を与える最小サイクル Zkのエネルギー(Coulomb&van der Waals)で評価
最安定構造の候補(上位1%)例)(δx, δy, δz) = (0.0, 2.1, 1.7)
• 上δx δy
δz(2) (1) (3,4)
-0.4
0
0.4
0.8
1.2
1.6
0 1 2 3 4 5 6 7 8 9 10 11 12 13
Ener
gy
Rank
4
5
6
-0.4
0
0.4
0.8
0 1 2 3 4 5 6 7 8 9 10 11 12 13
Ener
gy
Rank
4
5
6
2) van der Waals
1) Coulomb
(小串)
粒界構造を系統的に生成
Evaluation of Interface Structure
0 ps 20 ps 50 ps
1
2
3
4
0.5 1.0 1.5 2.0 2.5 [Å]
0 ps20 ps50 ps
r/2 decimation = 0 %
0 ps - 20 ps 20 ps - 50 ps
triangle in6-membered ring
interlayerorder
decimation = 50 %
Amorphous carbon at high-temperature MD
6-memberedring
5-memberedring
trianglein 6-membered ring
interlayerorder
7-memberedring
10 20 30 40 50Time [ps]
10 20 30 40 50Time [ps]
6-membered ring
5-membered ring
7-membered ring
3-membered ring4-membered ring
8-membered ring
Interlayer order can also be quantified based on PD.
Quantification of Structural Motifs
conventional ring analysis# of generators in PD
0-18 ps
19-24 ps
25-32 ps33-40 ps
40-100 psPC2 vector
PC1 vector
6員環の増減
7員環の増減
Detecting transformation of ring structures
PCA of PD1
SiO4 tetrahedron
SiO6 octahedron
Novel Structure in Oxide Glass
Transition from tetrahedral SiO4 to octahedral SiO6 (PD2)
(小原、小野寺、増野、田原)
Yellow:Si Red:Bridging O (BO) Blue:Non-bridging O (NBO) Cyan:R=Na, K
KO5(2NBO+3BO)
KO6(2NBO+4BO)
NaO4(2NBO+2BO)
NaO5(2NBO+3BO)
KO6(2NBO+4BO)
Four-membered ringswith R2NBO2 are detected by TDA→ Getting aware of hidden correlation between Na and K
δ-R+
δ-R+
R2Oremove one BO put two NBO
Two alkali ions are trapped around these two NBO to compensate negative charge.
Information beyond “pair-correlation” plays an important role!
Structural origin of mixed alkali effectin alkali silicate glass
(小原、小野寺、増野、田原)
保磁力
欠陥によるピンどめ
磁気ヒステリシス(巨視的解析)磁区構造
(微視的解析)
保磁力:発電効率に直結する磁気機能
モーター
(BH)max=Br×Hc
保磁力最大エネルギー積
高性能磁石(硬磁性材料) 高い保磁力が必要
鉄芯(軟磁性材料)低い保磁力が必要
保磁力マクロな物理量
磁区構造ミクロな磁気結合
対応関係は未だ完全に解明されていない。
結晶粒磁区構造粒界厚さ磁気異方性磁化
磁化反転に必要な外部磁場
電気自動車
モーターの構造(例)
保磁力の支配要因の可視化 (小嗣)
birth
deat
h
Magnetic Field (Oe)
Mag
netiz
atio
n (n
orm
aliz
ed)
-200 -100 0 100 200
-1
0
1 非平衡相
平衡相
磁気ヒステリシスループ PCA loadingから作成したPD
PDにおいて保磁力に寄与する非平衡相に相当する部分を同定
保磁力
保磁力近傍→ 磁化率が最も高い
→ 外部磁場変化に最も鋭敏
PDから元の磁区構造に逆解析
逆解析により迷路状磁区構造のトポロジカル欠陥を可視化
Generatorを逆解析
磁場変化に鋭敏なPDを生成 保磁力近傍の
PDを包含
非平衡成分のマッピング (小嗣)
パーシステンス図と主成分分析を用いたピニングサイトの可視化
磁区構造のパターン自体は毎回異なるが、「トポロジカル欠陥」の場所を積算してみると
格子欠陥の近傍がピンニングサイトになっている様子がわかった
(小嗣)
dark part : α-phase (hcp structure) bright part : β-phase (bcc structure)
(provided by KOBELCO)SEM image of forged Ti alloy
Quantitative characterization by inverse analysis of persistence diagram
・複雑な画像をコンパクトに記述・特徴ごとに定量化・不均一性の抽出
Machine Learning
Primitive Descriptor
(100-dimension vector)
⋮
area 1
area N⋮
Persistence Diagram (PD)
a set of PDs from massive small cells
scan
area 1
area N PC1 PC2 PC3
Different characterization by different feature values
Quantitative characterization by PCA of local structures via persistence diagram
画像内の局所構造の分布を自動抽出&可視化
Sample1
without pre-conditioning
Binarized PD0 PC1
Averaged Brightness
Binarized PD1 PC1
Sample1
Sample2
Sample3
with pre-conditioning
Sample1
Sample1
Binarized PD0 PC1
Binarized PD0 PC1
Binarized PD0 PC1
輝度情報が前面に出る(欲しい情報ではない) 「形」の情報に基づく分類
Search now “HomCloud AIMR” !
HomCloud パッケージの開発 (大林、平岡)
・原子配置や画像データ(2D,3D)を入力・パーシステント図の計算(順解析)・(b,d)点に対応する構造を入力データにマップ (逆解析)・Python による実装・GPL v3 の下での公開
HomCloud コミュニティーの立ち上げへの要望
•普及と啓蒙(理解の向上、誤解の解消)
•適用事例の集積と共有
•「足りないもの」を見つける(学術側・産業側の両面で)
• HomCloudの継続的な開発を支援
•窓口を明確化
開発中心のフェーズから応用展開のフェーズへ → 共同研究の内容の深化 → プロジェクトを通した「社会実装」
一方、「使ってみたけれど...」の声も多数
参加に関心のある方(企業、研究者個人)は赤木までご連絡ください → [email protected]