• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Digital twin of artifact systems by synthesizing multiscale modeling and inspections

Research Project

Project/Area Number 17KT0039
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeMulti-year Fund
Section特設分野
Research Field Intensification of Artifact Systems
Research InstitutionThe University of Tokyo

Principal Investigator

Okita Taira  東京大学, 大学院工学系研究科(工学部), 准教授 (50401146)

Co-Investigator(Kenkyū-buntansha) 村山 英晶  東京大学, 大学院新領域創成科学研究科, 教授 (10361502)
川畑 友弥  東京大学, 大学院工学系研究科(工学部), 教授 (50746815)
西野 成昭  東京大学, 大学院工学系研究科(工学部), 准教授 (90401299)
愛知 正温  東京大学, 大学院新領域創成科学研究科, 講師 (40645917)
Project Period (FY) 2017-07-18 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2019: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
Keywords構造健全性 / 非破壊検査 / 疲労損傷 / 分子シミュレーション
Outline of Final Research Achievements

In this research, we constructed Digital Twin of Artifact Systems (DTAS) in which physical and numerical models of structural materials at several length scales are constructed and integrated, while monitoring and inspection data are used as input parameters; DTAS reproduces the
current state of structural materials and predict their degradation. In particular, we focused on fatigue damage of structural materials, which is a common vulnerability in artifact systems. We developed inspection techniques that can detect crack growth at the macroscopic scale, or precursors of crack formation at the atomistic scale. We have also developed numerical models that reproduces the degradation of structural materials.

Academic Significance and Societal Importance of the Research Achievements

光ファイバセンサによる繰り返し負荷に伴う面内ひずみ分布測定、ひずみ集中部分の損傷蓄積を予測する塑性力学モデル構築、き裂発生の前兆である材質変化を検出する非線形超音波、およびその分子シミュレーションによる定量化、これらが学術的に特に意義の高い成果である。また、構造材料の挙動評価は人工物システムの安全性・信頼性に直結する課題であり、これらの技術をベースとする人工物デジタルツイン構築により、検査時期や運用計画の適正化、人工物システムの強靭化、システム可塑性の付与が可能となる。

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (65 results)

All 2021 2020 2019 2018 2017 Other

All Int'l Joint Research (6 results) Journal Article (14 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 14 results,  Open Access: 7 results) Presentation (45 results) (of which Int'l Joint Research: 9 results,  Invited: 5 results)

  • [Int'l Joint Research] University of Tennessee/Oak Ridge National Laboratory/Santa Clara University(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] KMUTT(タイ)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] University of Tennessee/Oak Ridge National Laboratory/Santa Clara University(米国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] KMUTT(タイ)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] KMUTT(タイ)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] University of Tennessee/Oak Ridge National Laboratory(米国)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Simulation study of helium bubble coalescence in tungsten at various temperatures relevant to fusion conditions2021

    • Author(s)
      Zhan Jie、Okita Taira、Ye Minyou、Kato Daiji、Suzuki Katsuyuki
    • Journal Title

      Computational Materials Science

      Volume: 187 Pages: 110076-110076

    • DOI

      10.1016/j.commatsci.2020.110076

    • NAID

      120007188007

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Molecular dynamics simulations evaluating the effect of stacking fault energy on defect formations in face-centered cubic metals subjected to high-energy particle irradiation2021

    • Author(s)
      Terayama Satoshi、Iwase Yuuki、Hayakawa Sho、Okita Taira、Suzuki Katsuyuki、Itakura Mitsuhiro
    • Journal Title

      Computational Materials Science

      Volume: 195 Pages: 110479-110490

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Digital Twin of Artifact Systems: Models Assimilated with Monitoring Data from Material Microstructures to Social Systems2020

    • Author(s)
      Okita Taira、Kawabata Tomoya、Murayama Hideaki、Nishino Nariaki、Aichi Masaatsu、School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan、Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
    • Journal Title

      International Journal of Automation Technology

      Volume: 14 Issue: 5 Pages: 700-712

    • DOI

      10.20965/ijat.2020.p0700

    • NAID

      130007897216

    • ISSN
      1881-7629, 1883-8022
    • Year and Date
      2020-09-05
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Accurate estimation of brittle fracture toughness deterioration in steel structures subjected to large complicated prestrains2020

    • Author(s)
      Hiroaki Kosuge, Tomoya Kawabata, Taira Okita, Hidenori Nako
    • Journal Title

      Crystals

      Volume: 10(10) Issue: 10 Pages: 867-867

    • DOI

      10.3390/cryst10100867

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] “Molecular simulations to investigate migration and coalescence of He bubbles in iron”2020

    • Author(s)
      Zhan Jie、Baba Takao、Hayakawa Sho、Okita Taira、Itakura Mitsuhiro
    • Journal Title

      Proceedings of SNA + MC 2020; Joint International Conference on Supercomputing in Nuclear Applications + Monte Carlo 2020

      Volume: -

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Establishment of damage estimation rules for brittle fracture after cyclic plastic prestrain in steel2020

    • Author(s)
      Kosuge Hiroaki、Kawabata Tomoya、Okita Taira、Murayama Hideaki、Takagi Shunsuke
    • Journal Title

      Materials & Design

      Volume: 185 Pages: 108222-108222

    • DOI

      10.1016/j.matdes.2019.108222

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Atomistic simulations for the effects of stacking fault energy on defect formations by displacement cascades in FCC metals under Poisson’s deformation2019

    • Author(s)
      Hayakawa Sho、Okita Taira、Itakura Mitsuhiro、Kawabata Tomoya、Suzuki Katsuyuki
    • Journal Title

      Journal of Materials Science

      Volume: 54 Issue: 16 Pages: 11096-11110

    • DOI

      10.1007/s10853-019-03688-1

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Screw dislocation-spherical void interactions in fcc metals and their dependence on stacking fault energy2019

    • Author(s)
      Hayakawa Sho、Doihara Kohei、Okita Taira、Itakura Mitsuhiro、Aichi Masaatsu、Suzuki Katsuyuki
    • Journal Title

      Journal of Materials Science

      Volume: 54 Issue: 17 Pages: 11509-11525

    • DOI

      10.1007/s10853-019-03716-0

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Atomistic simulations of grain boundary energies in austenitic steel2019

    • Author(s)
      Ratanaphan Sutatch、Sarochawikasit Rajchawit、Kumanuvong Noppadol、Hayakawa Sho、Beladi Hossein、Rohrer Gregory S.、Okita Taira
    • Journal Title

      Journal of Materials Science

      Volume: 54 Issue: 7 Pages: 5570-5583

    • DOI

      10.1007/s10853-018-03297-4

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A new concept of digital twin of artifact systems: synthesizing monitoring/inspections, physical/numerical models, and social system models2019

    • Author(s)
      Okita Taira、Kawabata Tomoya、Murayama Hideaki、Nishino Nariaki、Aichi Masaatsu
    • Journal Title

      Procedia CIRP

      Volume: 79 Pages: 667-672

    • DOI

      10.1016/j.procir.2019.02.048

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Interactions between clusters of self-interstitial atoms via a conservative climb in BCC?Fe2018

    • Author(s)
      Hayakawa Sho、Okita Taira、Itakura Mitsuhiro、Aichi Masaatsu、Suzuki Katsuyuki
    • Journal Title

      Philosophical Magazine

      Volume: 98 Issue: 25 Pages: 2311-2325

    • DOI

      10.1080/14786435.2018.1486047

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of stacking fault energies on formation of irradiation-induced defects at various temperatures in face-centred cubic metals2018

    • Author(s)
      Nakanishi D.、Kawabata T.、Doihara K.、Okita T.、Itakura M.、Suzuki K.
    • Journal Title

      Philosophical Magazine

      Volume: 98 Issue: 33 Pages: 3034-3047

    • DOI

      10.1080/14786435.2018.1515507

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Atomic simulations to evaluate effects of stacking fault energy on interactions between edge dislocation and spherical void in face-centred cubic metals2018

    • Author(s)
      Kohei Doihara, Taira Okita, Mitsuhiro Itakura, Masaatsu Aichi, Katsuyuki Suzuki
    • Journal Title

      Philosophical Magazine

      Volume: accepted Issue: 22 Pages: 2061-2076

    • DOI

      10.1080/14786435.2018.1472401

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] 材料挙動と計算機シミュレーションの接点(第2回)原子力材料の分子シミュレーション,現状と展望2017

    • Author(s)
      沖田泰良,板倉充洋
    • Journal Title

      日本原子力学会誌

      Volume: 59 Pages: 34-38

    • NAID

      130007800157

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 分子動力学法を用いた面心立方金属における析出硬化のナノメカニズム解明に関する研究(2)2021

    • Author(s)
      津川聖人、岩瀬祐樹、沖田泰良、早川頌、板倉充洋
    • Organizer
      日本原子力学会2021年春の大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 分子動力学法を用いた非線形超音波成分のナノ構造依存性に関する定量化(2)2021

    • Author(s)
      森承宇、沖田泰良、板倉充洋
    • Organizer
      日本原子力学会2021年春の大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] マルチスケールモニタリングとモデリングのシンセシスによる人工物デジタルツイン構築2021

    • Author(s)
      沖田泰良
    • Organizer
      第32回CCSEワークショップ
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Atomistic study to evaluate interactions between helium bubbles and an edge dislocation in iron2020

    • Author(s)
      Zhan Jie、Okita Taira、Ye Minyou、Watanabe Yoshiyuki
    • Organizer
      日本原子力学会2020年秋の大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 機械学習分子動力学法によるZr中の照射劣化挙動の解明2020

    • Author(s)
      寺山怜志、沖田泰良、板倉充洋、奥村雅彦
    • Organizer
      日本原子力学会2020年秋の大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 分子動力学法を用いた面心立方金属における析出硬化のナノメカニズム解明に関する研究2020

    • Author(s)
      津川聖人、岩瀬祐樹、沖田泰良、早川頌、板倉充洋
    • Organizer
      日本原子力学会2020年秋の大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 分子動力学法を用いた非線形超音波成分のナノ構造依存性に関する定量化2020

    • Author(s)
      森承宇、沖田泰良、板倉充洋
    • Organizer
      日本原子力学会2020年秋の大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 面心立方金属における析出硬化の名のメカニズム解明に関する研究2020

    • Author(s)
      岩瀬祐樹、早川頌、沖田泰良、板倉充洋
    • Organizer
      日本原子力学会2020年春の大会
    • Related Report
      2019 Research-status Report
  • [Presentation] MD法を用いた高エネルギー中性子照射下における自己格子間原子集合体形成過程の解明2020

    • Author(s)
      寺山怜志、岩瀬祐樹、早川頌、沖田泰良、板倉充洋
    • Organizer
      日本原子力学会2020年春の大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 機械学習分子動力学法を用いたZr中における空孔集合体挙動の解明2020

    • Author(s)
      馬場貴生、寺山怜志、沖田泰良、板倉充洋、奥村雅彦
    • Organizer
      日本原子力学会2020年春の大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 亀裂材弾塑性変形における小規模降伏項の高精度分離 -CTOD算定 式の高精度化に向けた取り組み-2019

    • Author(s)
      二宮孝太、沖田泰良、川畑友弥
    • Organizer
      日本船舶海洋工学会2019年春季講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 人工物デジタルツイン構築のためのマルチスケールモデル・モニタリングのシンセシス2019

    • Author(s)
      沖田泰良、川畑友弥、村山英晶、西野成昭、愛知正温
    • Organizer
      日本保全学会第16回学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 高精度な損傷蓄積則構築のためのメゾ空間スケールモデル構築2019

    • Author(s)
      小菅寛輝、川畑友弥、沖田泰良、村山英晶
    • Organizer
      日本保全学会第16回学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 構造材料を対象とした原子スケールの精度を有するマルチ時間スケールモデルの構築2019

    • Author(s)
      早川頌、沖田泰良、板倉充洋
    • Organizer
      日本保全学会第16回学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] MD法を用いた高エネルギー中性子照射下における欠陥形成過程の解明2019

    • Author(s)
      寺山怜志、岩瀬祐樹、早川頌、沖田泰良、板倉充洋
    • Organizer
      日本原子力学会2019年秋の大会
    • Related Report
      2019 Research-status Report
  • [Presentation] The microstructural evolution of c-type dislocation loop in zirconium and the effects of iron atoms on the formation process2019

    • Author(s)
      G. Qiang、T. Okita、Y. Adachi、S. Hayakawa、M. Itakura
    • Organizer
      日本原子力学会2019年秋の大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Atomistic simulations for the absorption process of an SIA cluster via self-climb in BCC-Fe2019

    • Author(s)
      S. Hayakawa、T. Okita、M. Itakura
    • Organizer
      14th International Symposium on Fusion Technology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Temperature Parallel Simulated Annealing with Self-generated Basins for Searching the Stable State of Microstructures in Materials2019

    • Author(s)
      S. Hayakawa、T. Okita、K. Shibasaki
    • Organizer
      14th International Symposium on Fusion Technology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Study of the stable configuration of cascade-induced defects in FCC metals using the temperature parallel simulated annealing with self-generated basins2019

    • Author(s)
      S. Hayakawa、T. Okita、M. Itakura、K. Suzuki、H. Xu、Y.N. Osetsky
    • Organizer
      19th International Conference on Fusion Reactor Materials
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Zr中における空孔型転位ループ形成過程の解明2019

    • Author(s)
      安達悠希也、強光友、早川頌、沖田泰良、板倉充洋
    • Organizer
      日本原子力学会2019年春の大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 面心立方金属における原子空孔集合体形成過程の照射劣化に及ぼす影響2019

    • Author(s)
      二宮孝太、早川頌、沖田泰良、板倉充洋
    • Organizer
      日本原子力学会2019年春の大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Active volume を用いた温度並列Simulated annealing によるメゾ時間スケール原子シミュレーション2019

    • Author(s)
      早川頌、沖田泰良、板倉充洋
    • Organizer
      日本原子力学会2019年春の大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 鉄鋼材料における繰り返し予ひずみが脆化に及ぼす影響の考察2019

    • Author(s)
      小菅寛輝、川畑友弥、高木俊輔
    • Organizer
      日本鉄鋼協会第177回春季講演大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 中性子照射脆化検出のための非破壊検査技術開発に関する研究2018

    • Author(s)
      沖田泰良
    • Organizer
      ちゅうでんサイエンス・フォーラム2018
    • Related Report
      2018 Research-status Report
  • [Presentation] A new concept of digital twin of artifact systems: synthesizing monitoring/inspections, physical/numerical models, and social system models2018

    • Author(s)
      T. Okita、T. Kawabata、 H. Murayama、N. Nishino、M. Aichi
    • Organizer
      12th CIRP International Conference on Intelligent Computation in Manufacturing Engineering
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 二酸化ウランおよびガンマ鉄のノンコリニア常磁性状態の第一原理計算2018

    • Author(s)
      板倉充洋、沖田泰良、中村博樹
    • Organizer
      日本原子力学会2018年秋の大会
    • Related Report
      2018 Research-status Report
  • [Presentation] MD法による中性子照射下結晶欠陥形成過程に及ぼす材料物性の影響(4)-ひずみ負荷の影響-2018

    • Author(s)
      川満昭英、沖田泰良、早川頌、板倉充洋
    • Organizer
      日本原子力学会2018年秋の大会
    • Related Report
      2018 Research-status Report
  • [Presentation] MD法を用いた原子空孔集合体-転位相互作用に及ぼす積層欠陥エネルギーの影響解明(4)2018

    • Author(s)
      土井原康平、沖田泰良、板倉充洋
    • Organizer
      日本原子力学会2018年秋の大会
    • Related Report
      2018 Research-status Report
  • [Presentation] On-the-fly キネティック・モンテカルロ法を用いた面心立方金属中における照射誘起欠陥の挙動に関する検討2018

    • Author(s)
      早川頌、柴崎京介、沖田泰良、 板倉充洋、 H. Xu 、Y.N. Osetsky
    • Organizer
      日本原子力学会2018年秋の大会
    • Related Report
      2018 Research-status Report
  • [Presentation] ボイドによる転位ピン止め過程の原子論的モデル化2018

    • Author(s)
      板倉充洋、沖田泰良
    • Organizer
      日本金属学会2018年秋の大会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] The effects of stacking fault energies on defect formation by collision cascade in FCC metals2018

    • Author(s)
      T. Okita、 A. Kawamitsu、S. Hayakawa、T. Kawabata、M. Itakura
    • Organizer
      Nuclear Materials 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] The evolution processes of self-interstitial atom clusters under displacement cascades in FCC metals2018

    • Author(s)
      S. Hayakawa、T. Okita、M. Itakura、 H. Xu、Y.N. Osetsky
    • Organizer
      Nuclear Materials 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] マルチスケールモデル・モニタリングのシンセシスによる人工物デジタルツインの構築2018

    • Author(s)
      沖田泰良
    • Organizer
      第二回サイバ-NDE研究会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] 照射下微細組織発達検出のための非破壊検査技術の開発2018

    • Author(s)
      沖田泰良
    • Organizer
      第22回 原子力計算科学セミナー
    • Related Report
      2017 Research-status Report
  • [Presentation] On-the-fly機構論的モンテカルロ法による原子炉構造材料の原子シミュ レーション2018

    • Author(s)
      早川頌
    • Organizer
      第22回 原子力計算科学セミナー
    • Related Report
      2017 Research-status Report
  • [Presentation] Molecular dynamics simulation to evaluate behaviors of vacancy-type defect clusters in Zirconium fuel claddings2018

    • Author(s)
      Hu Yilun
    • Organizer
      第22回 原子力計算科学セミナー
    • Related Report
      2017 Research-status Report
  • [Presentation] Molecular Dynamics Simulations of Effects of Stacking Fault Energies on Defect Formation Process in FCC Metals2018

    • Author(s)
      T. Okita
    • Organizer
      TMS2018
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] BCC鉄における自己格子間原子集合体の三次元的運動に関する検討2018

    • Author(s)
      早川 頌
    • Organizer
      日本原子力学会2018年春の大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 分子動力学法用いたFCC金属におけるボイド-転位相互作用の定量化2018

    • Author(s)
      土井原 康平
    • Organizer
      日本原子力学会2018年春の大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 面心立方金属を対象とした照射欠陥挙動のモデル化2017

    • Author(s)
      安達 悠希也
    • Organizer
      日本原子力学会2017年秋の大会
    • Related Report
      2017 Research-status Report
  • [Presentation] BCC-Feにおける転位―結晶欠陥集合体間相互作用の原子論的解析2017

    • Author(s)
      早川 頌
    • Organizer
      日本原子力学会2017年秋の大会
    • Related Report
      2017 Research-status Report
  • [Presentation] MD法による中性子照射下結晶欠陥形成過程に及ぼす材料物性の影響 (3)2017

    • Author(s)
      沖田 泰良
    • Organizer
      日本原子力学会2017年秋の大会
    • Related Report
      2017 Research-status Report
  • [Presentation] MD法を用いた原子空孔集合体-転位相互作用に及ぼす積層欠陥エネルギーの影響解明 (2)2017

    • Author(s)
      土井原 康平
    • Organizer
      日本原子力学会2017年秋の大会
    • Related Report
      2017 Research-status Report
  • [Presentation] MD simulations to investigate the effect of stacking fault energy on the interaction between screw dislocation and vacancy cluster in FCC metals2017

    • Author(s)
      K. Doihara
    • Organizer
      ICFRM-18
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Molecular dynamics simulations to elucidate effects of stacking fault energy on defect formation process under high energy of a primary knock-on atom2017

    • Author(s)
      T. Okita
    • Organizer
      ICFRM-18
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2017-07-21   Modified: 2022-12-28  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi