Awards/Grants

1. DEIM 2023 Student Presentation Award

2. Japan Student Services Organization (JASSO) Student Loan, Exemption [2023]

3. Osaka University Fellowship for Cross-disciplinary Innovation [2023-]

4. SIGMOD Student Travel Grant for the WSDM 2024

Internatioanl Conference Papers

2024

1. Kohei Obata. “Gaussian Graphical Model-Based Clustering of Time Series Data”. Proceedings of the 17th ACM International Conference on Web Search and Data Mining (WSDM ‘24), March 4–8, 2024, Merida, Mexico, pp. 8-12. (doi: 10.1145/3616855.3635728)

2. Kohei Obata, Koki Kawabata, Yasuko Matsubara, Yasushi Sakurai. “Dynamic Multi-Network Mining of Tensor Time Series”. Proceedings of the ACM Web Conference 2024 (WWW ’24, Oral Session), May 13–17, 2024, Singapore. Acceptance Rate for Oral Session: 192/2008, 9.6% (doi: 10.1145/3589334.3645461, github)

2022

1. Kohei Obata. “Automatic Time-Series Clustering via Network Inference”. 47th International Conference on Very Large Data Bases (VLDB) PhD workshop, September 5, 2022, Sydney, Australia. (link)

Domestic Journals/Presentations

2023

1. Kohei Obata, Yasuko Matsubara, Koki Kawabata, Kota Nakamura, Yasushi Sakurai. “Automatic Network Structure-based Clustering of Multivariate Time Series”. IPSJ Transactions on Databases (TOD) Vol.16, No.1, 1-13, January 2023. (link)

2. Kohei Obata, Koki Kawabata, Yasuko Matsubara, Yasushi Sakurai “時系列テンソルデータのための将来予測”. DEIM Forum 2023, March 5–9, 2023, Gifu, Japan. (link)