Knowledge Acquisition System Laboratory (Kato Laboratory) is especially interested in the research field of Information Retrieval, mainly focusing on the following fields: retrieval models and ranking, learning to rank, search intent estimation, knowledge base development, knowledge base applications, search behavior analysis, search user models, recommendation systems, and offline/online evaluation.

News

Research

SIGIR 2025 Paper Accepted

Our paper “LLM-based Query Expansion Fails for Unfamiliar and Ambiguous Queries”, authored by Kenya Abe, Kunihiro Takeoka, Makoto P. Kato and Masafumi Oyamada, has been accepted at SIGIR 2025 as a short paper.

News

KASYS Won DEIM 2025 Awards

Nao Tagai (M2), Yuto Nakachi (M2), Yuta Hondo (B4), Akinojo Tomizawa (B4), and Kouji Nishikawa (B4) won the student presentation award at DEIM 2025 (a domestic workshop)! 👏👏👏　　 DEIM 2025（第17回データ工学と情報マネジメントに関するフォーラム）

Research

ECIR 2025 Paper Accepted

Our paper “Investigating the Performance of Dense Retrievers for Queries with Numerical Conditions”, authored by Haruki Fujimaki and Makoto P. Kato, has been accepted at ECIR 2025 as a short paper.

Research

WISE 2024 Paper Accepted

Our paper “PR-Rank: A Parameter Regression Approach for Learning-to-Rank Model Adaptation Without Target Domain Data”, authored by Takumi Ito, Atsuki Maruta, Makoto P. Kato, and Sumio Fujita, has been accepted at WISE 2024 as a full paper.

News

Ito-san (M1) received IPSJ Yamashita SIG Research Award

Takumi Ito (M1) received the IPSJ Yamashita SIG Research Award for the DEIM 2024 presentation entitled “ドメイン特徴に基づくランキング学習モデルのドメイン適応” 👏👏👏 IPSJ Yamashita SIG Research Award (FY2024) – IPSJ IPSJ Yamashita SIG Research AwardThis award is given to the presenter of excellent papers presented at research forums and symposia supported by IPSJ. https://www.ipsj.or.jp/award/yamashita.html

Research

CIKM 2024 Paper Accepted

Our paper “Over-penalization for Extra Information in Neural IR Models”, authored by Kota Usuha, Makoto P. Kato, and Sumio Fujita, has been accepted at CIKM 2024 as a short paper.

News

KASYS Won DEIM 2024 Awards

Nao Tagai (M2), Yuto Nakachi (M2), and Atsuki Maruta (D2) won the student presentation award, and Atsuki Maruta, Nao Tagai, and Makoto P. Kato together won the best poster presentation award at DEIM 2024 (a domestic workshop)! 👏👏👏　 DEIM 2024（第16回データ工学と情報マネジメントに関するフォーラム）

Research

WebSci 2023 Paper Accepted

Our paper “What Web Search Behaviors Lead to Online Purchase Satisfaction?”, authored by Yuki Yanagida, Makoto P. Kato, Yuka Kawada, Takehiro Yamamoto, Hiroaki Ohshima and Sumio Fujita, has been accepted at WebSci 2023 as a full paper.

Research

ECIR 2023 Paper Accepted

Our paper “Theoretical Analysis on the Efficiency of Interleaved Comparisons”, authored by Kojiro Iizuka, Hajime Morita and Makoto P. Kato, has been accepted at ECIR 2023 as a full paper.