Tetsuji KUBOYAMA, Ph.D.
Professor,

Director, Computer Centre, &
Archival Science, Graduate School of Humanities,
Gakushuin University
1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, JAPAN [MAP]
E-mail:
Researchmap / ORCID / Google Scholar / DBLP

Current Research

Crystal growth, archival description and parliamentary text look unrelated, but they raise the same question: how do we enumerate discrete structures, and how do we compare them?

• Structure search on crystal surfaces. Enumeration of the discrete structures arising in crystal growth modelling, and similarity design over them. Recent work applies SAT solvers to validating the local electron counting rule, and combines density functional theory with Bayesian optimization to search for stable configurations.
• Fast search and clustering over large data. Filtering methods for nearest neighbour search using sketches, and clustering methods for large bipartite graphs.
• Text evaluation with large language models. Applying LLM-based evaluation to domains where judgements are obvious to humans but hard to produce consistently at scale, such as literary and political texts. One current target is the record of proceedings of the Japanese Diet.
• Computational archival science. Structural analysis of archival description standards — EAD, EAC-CPF and RiC — and extraction of context structures from descriptions.

See Research for details and CV for publications and appointments.

Open Teaching Materials

Teaching materials are published on a separate site.

• Records in Contexts: An Introduction

  A textbook on RiC, the ICA standard for archival description (PDF, CC BY 4.0). Also available in Japanese.

• Learning Data Analysis from Anti-Patterns

  Pitfalls of data analysis and machine learning, measured on a real authorship attribution task (PDF, CC BY 4.0, Japanese only). With marimo notebooks.

• Introduction to Computer Science

  Introductory lecture notes for undergraduates of any faculty, 13 chapters (HTML, CC BY-NC-SA 4.0, Japanese only).

News

• 2026.09 Records in Contexts: An Introduction updated to version 1.4.6 (Japanese) and 1.0.2 (English); revised editions will continue to appear.
• 2026.08 The English edition of Records in Contexts: An Introduction is now available.
• 2026 Two papers on fast filtering by conjunctive enumeration of sketches for nearest neighbour search.
• 2025.08 A paper on the search for stable atomic configurations in graphene-like BCN systems, in Crystal Growth & Design.
• 2025.01 A paper on a SAT solver-driven approach for validating the local electron counting rule, in the Journal of Crystal Growth.