I am a research engineer specializing in natural language processing and large language models.
Recently, I have been working on the research and development of Japanese large language models and their applications, including text embeddings, retrieval-augmented generation (RAG), and AI agents.
Research Interests
Natural language processing
Japanese large language models
Text embedding models
Retrieval-augmented generation (RAG)
Information retrieval
AI agents
Experience
SB Intuitions Corp.
Chief Research Engineer
May 2024–Present
Seconded from SoftBank Corp. from May 2024 to April 2025
Conducting research and development on Japanese large language models, text embeddings, retrieval-augmented generation (RAG), and AI agents
Since April 2026, directing the development and real-world deployment of Japanese large language models and multimodal models
PKSHA Technology Inc.
Algorithm Engineer
April 2021–April 2024
Responsible for requirements definition for enterprise AI solutions, development of machine learning and natural language processing algorithms, research and development in natural language processing, and algorithm development for in-house products
Publications
Peer-Reviewed International Conferences
Shengzhe Li, Masaya Ohagi, Hayato Tsukagoshi, Akihiko Fukuchi, Tomohide Shibata, and Daisuke Kawahara. “Construction of a Japanese RAG Benchmark Using Synthetic Documents on Non-existent Entities and Events.” LREC 2026, pp. 7435–7445, 2026.
Shengzhe Li, Masaya Ohagi, Ryokan Ri, Akihiko Fukuchi, Tomohide Shibata, and Daisuke Kawahara. “JMTEB and JMTEB-lite: Japanese Massive Text Embedding Benchmark and Its Lightweight Version.” LREC 2026, pp. 7423–7434, 2026.
Chihiro Yano, Akihiko Fukuchi, Shoko Fukasawa, Hideyuki Tachibana, and Yotaro Watanabe. “Multilingual Sentence-T5: Scalable Sentence Encoders for Multilingual Applications.” LREC-COLING 2024, pp. 11849–11858, 2024.
Peer-Reviewed Journal Articles
Takeo Uchida, Keita Abe, Yuma Endo, Shosei Ichiseki, Satoru Akita, Shiyun Liu, Sho Aradachi, Masataka Saito, Akihiko Fukuchi, Taiyo Kikkawa, Theo Dammaretz, Ibuki Kawamata, Yuki Suzuki, Shin-ichiro M. Nomura, and Satoshi Murata. “Revolving Vernier Mechanism Controls Size of Linear Homomultimer.” Small, 13(41), 1702158, 2017.
李聖哲, 大萩雅也, 李凌寒, 福地成彦, 柴田知秀, 河原大輔. 「JMTEB and JMTEB-lite: Japanese Massive Text Embedding Benchmark and Its Lightweight Version」. 情報処理学会 第265回自然言語処理研究発表会, 2025.
板井孝樹, 大萩雅也, 福地成彦. 「Chain of Abstractionに基づく日本語Agentic RAGモデルの学習」. NLP若手の会 第20回シンポジウム, 2025.