| 2025 | AAAI | Layered-Parameter Perturbation for Zeroth-Order Optimization of Optical Neural Networks. | Hiroshi Sawada, Kazuo Aoyama, Masaya Notomi |
| 2025 | ICML | Natural Perturbations for Black-box Training of Neural Networks by Zeroth-Order Optimization. | Hiroshi Sawada, Kazuo Aoyama, Yuya Hikima |
| 2024 | DAC | Zeroth-Order Optimization of Optical Neural Networks with Linear Combination Natural Gradient and Calibrated Model. | Hiroshi Sawada, Kazuo Aoyama, Kohei Ikeda |
| 2021 | ICCAD | Acceleration Method for Learning Fine-Layered Optical Neural Networks. | Kazuo Aoyama, Hiroshi Sawada |
| 2019 | ICASSP | Similarity Search-based Blind Source Separation. | Hiroshi Sawada, Kazuo Aoyama |
| 2016 | SDM | Pivot-based k-means Algorithm for Numerous-class Data Sets. | Takashi Hattori, Kazuo Aoyama, Kazumi Saito, Tetsuo Ikeda, Eri Kobayashi |
| 2015 | ICASSP | Double-layer neighborhood graph based similarity search for fast query-by-example spoken term detection. | Kazuo Aoyama, Atsunori Ogawa, Takashi Hattori, Takaaki Hori |
| 2014 | ICASSP | Zero-resource spoken term detection using hierarchical graph-based similarity search. | Kazuo Aoyama, Atsunori Ogawa, Takashi Hattori, Takaaki Hori, Atsushi Nakamura |
| 2013 | ICASSP | Graph index based query-by-example search on a large speech data set. | Kazuo Aoyama, Atsunori Ogawa, Takashi Hattori, Takaaki Hori, Atsushi Nakamura |
| 2011 | KDD | Fast approximate similarity search based on degree-reduced neighborhood graphs. | Kazuo Aoyama, Kazumi Saito, Hiroshi Sawada, Naonori Ueda |
| 2010 | ICASSP | Fast similarity search on a large speech data set with neighborhood graph indexing. | Kazuo Aoyama, Shinji Watanabe, Hiroshi Sawada, Yasuhiro Minami, Naonori Ueda, Kazumi Saito |
| 2002 | FPL | Threshold Element-Based Symmetric Function Generators and Their Functional Extension. | Kazuo Aoyama, Hiroshi Sawada |
| 2002 | ISCAS | A reconfigurable logic circuit based on threshold elements with a controlled floating gate. | Kazuo Aoyama |
| 2000 | FPL | A Threshold Logic-Based Reconfigurable Logic Element with a New Programming Technology. | Kazuo Aoyama, Hiroshi Sawada, Akira Nagoya, Kazuo Nakajima |