SEMINAR

セミナー

MATセミナー開催のお知らせ

日時: 2026年6月11日（木）13:30～15:00
使用言語: 英語
開催場所: 横須賀本部本館第1セミナー室 & Meet (ハイブリッド開催)
発表者: Jian LIN
タイトル: International Advances in AI-Enabled Global Ocean and Deep Sea Exploration
概要: Marine geoscience is a highly interdisciplinary field essential for understanding interactions among the lithosphere, hydrosphere, atmosphere, biosphere, and anthroposphere. Rapid advances in intelligent technologies have significantly accelerated frontier research, including crewed and uncrewed deep-sea submersibles, scientific ocean drilling, seafloor observatories, and big data–driven high-performance computing:

1) Probing Deep Earth processes: 10,000-m OBS arrays have enabled high-resolution imaging of the Challenger Deep in the Mariana Trench, improving constraints on subduction structures and deep-water cycling. Under-ice exploration of the Arctic Gakkel Ridge has further advanced models of ultraslow spreading dynamics.

2) Investigating seafloor resources and environments: AUVs equipped with multidisciplinary sensors have enabled near-bottom, multi-parameter observations and high-precision sampling in regions such as the Southwest Indian Ocean, promoting integrated understanding of hydrothermal vents and cold seep systems.

3) Coupled modeling of ocean systems: By combining observational data with supercomputing, end-to-end simulations of the 2011 Tōhoku earthquake–tsunami, seafloor deformation, and transoceanic transport of Fukushima-derived contaminants have been achieved, highlighting the role of multi-system coupling in hazard assessment.

Despite these advances, major regional gaps remain (e.g., the Indian Ocean), where key questions on lithosphere–asthenosphere interaction, ocean–atmosphere coupling, marine hazards, and ecosystem responses remain poorly constrained. Addressing these challenges requires coordinated, interdisciplinary efforts. Future priorities include next-generation autonomous platforms, ocean digital twin systems driven by big data, and AI-enhanced hazard prediction models, alongside strengthened international collaboration to advance marine information technology, advanced equipment, new materials, and marine energy innovation.

Speaker: Jian LIN
Position: Academician of Academia Europaea, Chair Professor and Director of Advanced Institute for Ocean Research, Southern University of Science and Technology (China), Leader of Shenzhen Ocean University Preparatory Team (China)
Institution: Southern University of Science and Technology, China

Biography:
Chair Professor Jian Lin is an internationally renowned geophysicist, a member of Academia Europaea and European Academy of Sciences. He is the Director of Advanced Institute for Ocean Research, Southern University of Science and Technology, and leads the construction of Shenzhen Ocean University. He has made seminal contributions to global ocean sciences and earthquake research. Prof. Lin was a Chair of the InterRidge International Science Program, Senior Scientist at the Woods Hole Oceanographic Institution (WHOI), and a faculty member of the Massachusetts Institute of Technology-WHOI Joint Program in Oceanography. He was elected a fellow of American Geophysical Union, Geological Society of America, American Association for the Advancement of Science, and Henry Bigelow Chair Award for Excellence in Oceanography. Prof. Lin is a recipient of the 2024 Axford Medal Award by the Asia Oceania Geosciences Society. His research was recognized as the Top Ten Advances in Ocean Science and Technology (2019), First Prize of Natural Science Award of Guangdong Province (2020), Grand Prize of Ocean Science and Technology Award (2021), and Top Ten Advances in China for Oceanology and Limnology (2023). He has published more than 300 papers in high-impact international journals including Nature and Science; one of his earthquake research papers was ranked by the Institute of Scientific Information as the most-cited paper in a decade.
Google Scholar:
https://scholar.google.co.jp/citations?hl=en&user=UIDIiesAAAAJ

MATセミナー開催のお知らせ

日時: 2026年4月22日（水）13:00～15:00
使用言語: 日本語
開催場所: 横浜研究所情報技術棟5階508 MATシアター & Zoom (ハイブリッド開催)
発表者: 根上春 (K-pro)
タイトル: KZ型方程式の積分変換と組み紐群のユニタリ表現の構成法
概要: 微分方程式は、ある量の変化率がその量自身に依存する現象を記述する数式であり、自然科学における数理モデルとして広く用いられる。複素平面上で方程式の解を連続的に変化させると、特異点の周りを一周した後に元とは異なる解へと変換される「モノドロミー」と呼ばれる現象が生じる。この変換の構造はトポロジー的な不変量であり、解の大域的な振る舞いを代数的・幾何学的に捉える枠組みへとつながる。本セミナーでは、 n粒子系を記述する微分方程式の一種である KZ（Knizhnik-Zamolodchikov）型方程式を題材とする。この方程式のモノドロミーには、粒子の軌跡が互いに絡み合う様子を記述する代数的構造である組紐群（ブレイド群）が自然に現れる。本講演では、解の積分表示を通じてこの対応を具体的に構成する手法を紹介する。さらに、組紐群がトポロジカル量子計算において果たす役割と関連させながら、量子コンピュータへの応用可能性についても触れる。

MATセミナー開催のお知らせ

日時: 2026年4月1日（水）13:00～15:00
使用言語: 日本語
開催場所: 横浜研究所情報技術棟5階508 MATシアター & Zoom (ハイブリッド開催)
発表者: 荒川創太 (MAT)
タイトル: 原始太陽系円盤の形成と、太陽系の同位体組成（酸素、アルミニウム）
概要: 太陽系を含む星・惑星系は原始惑星系円盤とよばれる状態を経て形成される。コンドライト隕石は円盤中で形成された小天体の破片であり、その同位体組成は円盤がどのように形成・進化したのかを理解するための手がかりとなる。
本講演では、特に酸素とアルミニウムの同位体組成に着目し、太陽系の形成環境・形成過程を議論する予定である。