Education

• • Apr. 2015 Entered Faculty of Mathematics, Kyushu University, Fukuoka, Japan

  • Mar. 2019 Graduated Bachelor (Science)
    Faculty of Mathematics, Kyushu University, Fukuoka, Japan

  • Apr. 2019 Entered Graduate School of Mathematics (Master's Course), Kyushu University, Fukuoka, Japan

  • Mar. 2021 Graduated Master (Mathematics)
    Graduate School of Mathematics (Master's Course), Kyushu University, Fukuoka, Japan

  • Apr. 2021 Entered Graduate School of Mathematics (Doctoral Course), Kyushu University, Fukuoka, Japan

  • Mar. 2024 Graduated Doctor (Mathematics)
    Graduate School of Mathematics(Doctoral Course), Kyushu University, Fukuoka, Japan

Scientific Career

• • Apr. 2024-Sep. 2024, Specially Appointed Assistant Professor, Institute of Innovate Research, Tokyo Institute of Technology, Japan

  • Oct. 2024-present, Specially Appointed Assistant Professor, Institute of Integrated Research, Institute of Science Tokyo, Japan

Publications

(1) Research Papers for Academic Journal

• Hiroki Ishikura, Makoto Tsukamoto, Shingo Egi, Keiichiro Yamamura, Yoshihiko Fujisawa, Akihiro Yoshida, Hiroyuki Koshiro, Katsuki Fujisawa, Optimization of Transporting Time through Load Shuffling in Automated Storage and Retrieval System and Evaluation via Demonstration Experiments, Japan Journal of Industrial and Applied Mathematics, 2025

• Akihiro Yoshida, Haruki Sato, Shiori Uchiumi, Nariaki Tateiwa, Daisuke Kataoka, Akira Tanaka, Nozomi Hata, Yousuke Yatsushiro, Ayano Ide, Hiroki Ishikura, Shingo Egi, Miyu Fuji, Hiroki Kai and Katsuki Fujisawa, Comprehensive and Practical Optimal Delivery Planning System for Replacing Liquefied Petroleum Gas Cylinders, Japan Journal of Industrial and Applied Mathematics, 2024

• Keiichiro Yamamura, Issa Oe, Nozomi Hata, Hiroki Ishikura, and Katsuki Fujisawa, Appropriate Balance of Diversification and Intensification Improves Performance and Efficiency of Adversarial Attacks, Transactions on Machine Learning Research (TMLR), 2024, ISSN: 2835-8856

• Hiroki Ishikura, Takashi Wakamatsu, Nozomi Hata and Katsuki Fujisawa, Optimization of film-type optical fiber wiring design using mixed-integer programming problem, Japan Journal of Industrial and Applied Mathematics, Published: 29th, Dec., 2023, https://doi.org/10.1007/s13160-023-00632-4

• Hiroki Ishikura, Nariaki Tateiwa, Shingo Egi, Issa Oe, Nozomi Hata, Toru Mitsutake, Keiichiro Yamamura, Miyu Fujii and Katsuki Fujisawa, Scheduling system for automated storage and retrieval system with multiple machines using a time-expanded network, Japan Journal of Industrial and Applied Mathematics, Published: 12th, Oct. 2023, https://doi.org/10.1007/s13160-023-00619-1

(2) Research Papers for International Conference

• Ken Kawano, Keiichiro Yamamura, Akihiro Yoshida, Hiroki Ishikura, Shinjiro Hirai, Yoshihiko Fujisawa, Katsuki Fujisawa. Localization-Confidence-Aware Pseudo-Label Selection for YOLO-based Semi-Supervised Object Detection. Artificial Intelligence with Biased or Scarce Data (AIBSD), In Conjunction with the 40th AAAI Conference on Artificial Intelligence 2026, January 27, 2026. (To appear)

• Keiichiro Yamamura, Issa Oe, Hiroki Ishikura, and Katsuki Fujisawa, Enhancing output diversity improves Conjugate Gradient-based adversarial attacks, the 4th edition of the International Conference on Pattern Recognition and Artificial Intelligence (ICPRAI2024), 2024.

• Issa Oe, Keiichiro Yamamura, Hiroki Ishikura, Ryo Hamahira and Katsuki Fujisawa Superpixel Attack: Enhancing Black-box Adversarial Attack with Image-driven Division Areas AJCAI (Australasian Joint Conference on Artificial Intelligence), 2023.

• Miyu Fujii, David Taingngin, Keiichiro Yamamura, Nozomi Hata, Hiroki Kai, Ryuji Noda, Hiroki Ishikura, Tatsuru Higurashi, and Katsuki Fujisawa, Development and Evaluation of Embedding Methods for Graphs with Multi Attributes, Second Workshop on Knowledge Graphs and Big Data, In Conjunction with IEEE Big Data 2022, 17, Dec, 2022

• Keiichiro Yamamura, Haruki Sato, Nariaki Tateiwa, Nozomi Hata, Toru Mitsutake, Issa Oe, Hiroki Ishikura and Katsuki Fujisawa, Diversified Adversarial Attacks based on Conjugate Gradient Method, Thirty-ninth International Conference on Machine Learning (ICML 2022), 19-21 Jul, 2022.

(3) Doctoral Paper

• H. Ishikura, "Social Problems Using Integer Programming,"  The Ph.D. thesis in Kyushu University

Presentation

• Hiroki Ishikura, Application of Cyber-Physical System in Factories, The 8th NUS-ISM-ZIB-IIR-MODAL Workshop Next Generation Computing and Algorithms in the Digital Era,  NUS, Singapore, August 14th, 2024

• Hiroki Ishikura, "Realization of smart factories using IP," The 7th ZIB-IMI-ISM-NUS-RIKEN-MODAL Workshop on Future Algorithms and Applications, 27th to 30th September, 2023

• Hiroki Ishikura, Shingo Egi Keiichiro Yamamura, Issa Oe, Makoto Tsukamoto, Jiei Maeda, Hiroyuki Koshiro and Katsuki Fujisawa, “Realization of smart factories using MIP,” 10th International Congress on Industrial and Applied Mathematics (ICIAM2023), Waseda University, 20th to 25th August 2023.

• Hiroki Ishikura, Nariaki Tateiwa, Shingo Egi, Issa Oe, Nozomi Hata, Toru Mitsutake, Keiichiro Yamamura, Miyu Fujii and Katsuki Fujisawa, “Towards an optimal operation of automated storage and retrieval system with multiple machines,” The 6th RIKEN-IMI-ISM-NUS-ZIB-MODAL-NHR Workshop on Advances in Classical and Quantum Algorithms for Optimization and Machine Learning, Tokyo University and Kyushu University, 16th to 22nd September 2021

• Hiroki Ishikura, Shingo Egi, Nariaki Tateiwa, Katsuki Fujisawa, "Mobility Optimization for Smart Factories via a Multi-Commodity Flow Problem on a Time-Expanded Graph," The 5th ZIB-RIKEN-IMI-ISM MODAL Workshop on Optimization, Data Analysis and HPC in AI, Online, 27th to 30th September, 2021.