Nozomi Hata (Ph.D.)

Learning and Intelligent Systems Research Group
Innovative Communication Laboratory
NTT Communication Science Laboratories

Contact Information:
nozomi.hata (at)
2-4 Hikaridai, Seika, Souraku,
Kyoto 619-0237, JAPAN

Research Interests

  • Optimization problems on Graphs
  • Representation learning on Graphs


  • Journal Paper
  • Conference Paper

Journal Paper

  1. Akira Tanaka, Nariaki Tateiwa, Nozomi Hata, Akihiro Yoshida, Takashi Wakamatsu, Shota Osafune, Katsuki Fujisawa, Offline map matching using time-expanded graph for low-frequency data, Transportation Research Part C: Emerging Technologies, Volume 130, 2021, 103265, ISSN 0968-090X,
  2. Akihiro Yoshida, Tatsuru Higurashi, Masaki Maruishi, Nariaki Tateiwa, Nozomi Hata, Akira Tanaka, Takashi Wakamatsu, Kenichi Nagamatsu, Akira Tajima, Katsuki Fujisawa, New Performance Index “Attractiveness Factor” for Evaluating Websites via Obtaining Transition of Users’ Interests, Data Science and Engineering, Springer, 2019, DOI : 10.1007/s41019-019-00112-1
  3. Katsuki Fujisawa, Toyotaro Suzumura, Hitoshi Sato, Koji Ueno, Satoshi Imamura, Ryo Mizote, Akira Tanaka, Nozomi Hata, Toshio Endo, Advanced Computing and Optimization Infrastructure for Extremely Large-Scale Graphs on Post-peta-scale Supercomputers, Advanced Software Technologies for Post-Peta Scale Computing, Springer, 2018, DOI:

Conference Paper

  1. Keiichiro Yamamura, Haruki Sato, Nariaki Tateiwa, Nozomi Hata, Katsuki Fujisawa, Issa Oe, Hiroki Ishikura and Toru Mitsutake, Diversified Adversarial Attacks based on Conjugate Gradient Method, Thirty-ninth International Conference on Machine Learning (ICML 2022), 19-21 Jul, 2022.
  2. Nozomi Hata, Shizuo Kaji, Akihiro Yoshida, Katsuki Fujisawa, Nested Subspace Arrangement for Representation of Relational Data, Thirty-seventh International Conference on Machine Learning (ICML2020), 12-18 Jul, 2020.
  3. Akihiro Yoshida, Yosuke Yatsushiro, Nozomi Hata, Tatsuru Higurashi, Nariaki Tateiwa, Takashi Wakamatsu, Akira Tanaka, Kenichi Nagamatsu, and Katsuki Fujisawa, Practical End-to-End Repositioning Algorithm for Managing Bike-Sharing System, The proceedings of the IEEE BigData 2019 , 2019, in Los Angeles, CA, USA, 2019
  4. Nozomi Hata, Takashi Nakayama, Akira Tanaka, Takashi Wakamatsu, Akihiro Yoshida, Nariaki Tateiwa, Yuri Nishikawa, Jun Ozawa, and Katsuki Fujisawa. Mobility Optimization on Cyber Physical System via Multiple Object Tracking and Mathematical Programming, the Fifth International Workshop on High Performance Big Graph Data Management, Analysis, and Mining (BigGraphs 2018), in conjunction with the 2018 IEEE International Conference on Big Data (IEEE BigData 2018), in Seattle, WA, USA, 2018
  5. Nariaki Tateiwa, Nozomi Hata, Akira Tanaka, Akihiro Yoshida, Takashi Wakamatsu,Takashi Nakayama, Katsuki Fujisawa. Hybrid Vehicle Control and Optimization with a New Mathematical Method, The 5th IFAC Conference on Engine and Powertrain Control, Simulation and Modeling, in Changchun, China, 2018
  6. Akira Tanaka, Nozomi Hata, Nariaki Tateiwa, Katsuki Fujisawa. Practical Approach to Evacuation Planning Via Network Flow and Deep Learning, the Fourth International Workshop on High Performance Big Graph Data Management, Analysis, and Mining (BigGraphs 2017), in conjunction with the 2017 IEEE International Conference on Big Data (IEEE BigData 2017), in Boston, MA, USA, 2017
  7. Satoshi Imamura, Keitaro Oka, Yuichiro Yasui, Yuichi Inadomi, Katsuki Fujisawa, Toshio Endo, Koji Ueno, Keiichiro Fukazawa, Nozomi Hata, Yuta Kakibuka, Koji Inoue, and Takatsugu Ono, Evaluating the Impacts of Code-Level Performance Tunings on Power Efficiency, The proceedings of the IEEE BigData2016, 2016.