Hajime Kiyama / 木山 朔 

Research interests

• Computational Linguistic / Natural Language Processing

  • Language Change

  • Machine Translation

  • Grammatical Error Correction

• Machine Learning

  • Embedding Representation

Publications

Jounal

• 木山朔, 相田太一, 小町守, 小木曽智信, 高村大也, 持橋大地.
  通時的な類似度行列に基づく単語の意味変化の分析.
  自然言語処理, Vol.32, No.4, December, 2025. [paper]

International conference

• Hajime Kiyama, Taichi Aida, Mamoru Komachi, Toshinobu Ogiso, Hiroya Takamura, Daichi Mochihashi.
  Analyzing Continuous Semantic Shifts with Diachronic Word Similarity Matrices.
  Proceedings of the 31th International Conference on Computational Linguistics (COLING 2025). January, 2025. (853/2723) [arXiv] [paper] [slide]

Domestic conference (Japanese)

• 佐藤祥太, 木山朔, 中島秀太, 小町守, 唐堂由其.
  単語埋め込みの独立成分分析の軸が解釈ができる粒度はどれくらいか？
  言語処理学会第31回年次大会.March, 2025. [paper]

• 木山朔, 相田太一, 小町守, 小木曽智信, 高村大也,  持橋大地.
  単語の通時的な類似度行列による意味変化パターンの分析.
  情報処理学会第262回自然言語処理研究会.December, 2024. [paper] [優秀研究賞]

• 木山朔, 相田太一, 小町守, 小木曽智信, 高村大也, 松井秀俊, 持橋大地.
  意味変化分析に向けた単語埋め込みの時系列パターン分析.
  言語処理学会第30回年次大会.March, 2024. [paper] [slide]

• 木山朔, 金輝燦, 平澤寅庄, 岡照晃, 小町守. 
  Decoderのみを用いた機械翻訳モデルの分析.
  言語処理学会第29回年次大会.March, 2023. [paper] [poster] [slide]

• 木山朔, 上坂奏人, 佐藤郁子, 佐藤京也, 米田悠人, 小山碧海, 三田雅人, 岡照晃, 小町守. 
  日本語文法誤り訂正の流暢性評価に向けたデータ作成. 
  言語処理学会第28回年次大会. March, 2022.  [paper] [poster] [data] [若手奨励賞]

Symposium (Japanese)

• 大橋美緒, 凌志棟, 木山朔, 小町守
  深層学習による日本語複単語表現の識別の課題分析.
  NLP若手の会第20回シンポジウム. September, 2025. [株式会社マイベスト賞, 筆頭著者のみ]

• 山下伊織, Bian Kexin, 木山朔, 小町守
  LLM-as-a-judgeによる文書レベルの日本語平易化の評価.
  NLP若手の会第20回シンポジウム. September, 2025.

• 木山朔,  相田太一, 小町守, 小木曽智信, 高村大也, 持橋大地.
  日本語の単語を対象とした複数時期の意味変化パターン分析.
  NLP若手の会第19回シンポジウム. September, 2024. [poster] [フューチャー株式会社賞] 

• 臼井久生, 木山朔, 古宮嘉那子.
  大規模視覚言語モデルの謎解き能力調査. 
  NLP若手の会第19回シンポジウム. September, 2024.

• 木山朔, 金輝燦, 平澤寅庄, 岡照晃, 小町守. 
  Causal言語モデルによる機械翻訳.
  NLP若手の会第17回シンポジウム. August, 2022. [poster] [奨励賞] 

Awards

• 2024.12 Outstanding Paper Award (2/18) 

  • The 262nd Natural Language Processing Research Meeting of the Information Processing Society of Japan [link]

• 2024.09 Sponsor Award (Future Corporation) 

  • The 19th YANS Symposium [link][article]

• 2023.08 Hackathon Excellence Award (1/6) 

  • Leaderboard Hackathon, The 18th YANS Symposium [link]

• 2023.03 Best Student Award (GPA:3.66/4.00,  146/128 credit) 

  • Tokyo Metropolitan University, Faculty of System Design, Department of Computer Science [link] [grade]

• 2022.08 Encouragement Award (10/68) 

  • The 17th YANS Symposium [link]

• 2022.03 Young Researcher Encouragement Award (12/280) 

  • The 28th Annual Meeting of the Association for Natural Language Processing (Japan) [link]

Experience

• 2025.09 -  Present：Shogakukan Inc. ,  Contract Research

  • Project of Nihon Kokugo Daijiten 3rd edition

• 2025.07 -  Present：Hitotsubashi University, Research Assistant 

  • Research Assistant in a Laboratory

• 2025.04 - 2025.05：Hitotsubashi University, Teaching Assistant 

  • Teaching Assistant at Programming 1

• 2024.11 - 2025.06 ：Hitotsubashi University, Contract Research

  • Research Assistant in a Laboratory

• 2024.04 - 2024.07：Tokyo Metropolitan University, Teaching Assistant

  • Teaching Assistant at NLP 100 Knock  

• 2023.08 - 2024.02：Hitotsubashi University, Contract Research  

  • Evidence-Based Survey and Analysis of Important Scientific and Technological Fields

• 2023.09 - 2023.10：Recruit Co., Data Specialist Intern 

  • Project of Recommendation System

• 2023.09  ( 2weeks )：Chura DATA Inc, Data Scientist Intern 

  • Project of LLM based Grammatical Error Correction

• 2023.04 - 2023.07：Tokyo Metropolitan University, Teaching Assistant 

  • Teaching Assistant at NLP 100 Knock  

Academic Activities

Scholarship/Grant

• April 2026 - March 2028. Japan Society for the Promotion of Science "Research Fellowship for Young Scientists" (JSPS DC2)

  • 200,000 yen / month (Scholarship, expected)

  • 1,600,000 yen (Grant, expected)

• April 2025 - March 2026.  “The Bridge to the Future” Doctoral Innovation Human Resource Development Project, Hitotsubashi University (JST SPRING)

  • 180,000 yen / month (Scholarship)

  • 300,000 yen / year (Grant)

Committee

• April 2025 - March 2027.  YANS Symposium

• October 2025 - Present.  CL Nomadic

Skill

Programming

• Python：Fluent

• C++：Beginner

Language

• Japanese

  • native

• English

  • TOEIC L&R 715 (2021/10/24)

  • Duolingo 90 (2025/01/08)