• JP Patent No. 7668398 — “Tapping Inspection Device, Tapping Inspection Method, and Tapping Inspection Program” (2025)

• Challenge Award (Meritorious Service Award, ONO SOKKI Co., Ltd.) (2024)
• Best Presentation Award (Internal Technical Conference, ONO SOKKI Co., Ltd.) (2023)
• Category 1 Scholarship (Master’s Program) – 50% Tuition Exemption (Japan Student Services Organization) (2022)
• Outstanding Student Award (Acoustical Society of Japan, Hokuriku Branch) (2022)
• 2nd Place, Grill Master Competition (Yakishi) – Hokushinetsu District (Via Holdings Co., Ltd.) (2022)
• Excellent Presentation Award (Joint Conference of Institutes Related to Electrical and Information Engineering, Hokuriku Branch; Acoustical Society of Japan, Hokuriku Branch) (2021)

• Article (Construction Data Co., Ltd.) (2024)
• Article (Inspection Equipment News) (2024)

Journal Articles

• Tsubasa Sakai, Daisuke Morikawa, Parham Mokhtari, “Detection limit of sound images spatially split by synthesized binaural signals,” Acoustical Science and Technology, 43(3), pp. 213–215. (2022.03)
• Tsubasa Sakai, Daisuke Morikawa, Parham Mokhtari, Tatsuya Hirahara, “Detection limit of sound images spatially split by interaural time and level differences,” Acoustical Science and Technology, 42(5), pp. 298–300. (2021.09)

Oral Presentations

• Holroo Dorji, Kenji Tada, Tsubasa Sakai, Hidema Motoki, Ryota Oshima, Rune Arai, Hiroki Kawagoe, Tetsuya Omura, “Tile Delamination Estimation Method from Tapping Sound by Machine Learning, Part 3: Fabrication of Test Specimens and Stiffness Evaluation through FEM Analysis,” Architectural Institute of Japan (AIJ) Annual Meeting 2025. (2025.09)
• Tsubasa Sakai, Kenji Tada, Hidema Motoki, Holroo Dorji, Rune Arai, Ryota Oshima, Hiroki Kawagoe, Tetsuya Omura, “Tile Delamination Estimation Method from Tapping Sound by Machine Learning, Part 4: Validating the Proposed Algorithm with Tiles Installed Differently,” AIJ Annual Meeting 2025. (2025.09)
• Kenji Tada, Tsubasa Sakai, Hidema Motoki, Holroo Dorji, Rune Arai, Ryota Oshima, Hiroki Kawagoe, Tetsuya Omura, “Tile Delamination Estimation Method from Tapping Sound by Machine Learning, Part 5: Proposal of a Novel Delamination Evaluation Method Using Leeb Hardness Tester,” AIJ Annual Meeting 2025. (2025.09)
• Tsubasa Sakai, Kenji Tada, Ryota Oshima, “Tile Delamination Estimation Method from Tapping Sound by Machine Learning, Part 1: an Algorithm for Tile Delamination Estimation,” AIJ Annual Meeting 2024. (2024.08)
• Kenji Tada, Tsubasa Sakai, Ryota Oshima, “Tile Delamination Estimation Method from Tapping Sound by Machine Learning, Part 2: Validating the Proposed Algorithm,” AIJ Annual Meeting 2024. (2024.08)
• Tsubasa Sakai, Daisuke Morikawa, Parham Mokhtari, “Effects of visual stimulus size on the sound images spatially split by interaural time and level differences,” Acoustical Society of Japan (ASJ) Spring Meeting 2022, Proceedings, pp. 651–652. (2022.03)
• Tsubasa Sakai, Daisuke Morikawa, Parham Mokhtari, “Effect of visual stimuli on the perception of spatially separated sound images of synthesized binaural signals,” Institute of Image Information and Television Engineers (ITE) Technical Report, 46(7), HI2022-7, pp. 57–62. (2022.02)
• Tsubasa Sakai, Daisuke Morikawa, Parham Mokhtari, “Factors affecting the perception of spatially separated sound images by interaural differences,” ASJ Hearing Research Meeting, 51(7), H-2021-66, pp. 449–454. (2021.11)
• Tsubasa Sakai, Daisuke Morikawa, Parham Mokhtari, “Effect of frequency band of synthesized binaural signal on detection limit of spatially split sound images,” ASJ Autumn Meeting 2021, Proceedings, pp. 649–650. (2021.09)
• Tsubasa Sakai, Daisuke Morikawa, “Perception of spatially separated sound images by interaural differences for high-pass and low-pass noises,” 2021 Joint Conference of Electrical & Information Societies (Hokuriku Branch), Proceedings, G-2. (2021.09)
• Tsubasa Sakai, Daisuke Morikawa, Parham Mokhtari, Tatsuya Hirahara, “Detection limit of sound images spatially split by synthesized binaural signal,” ASJ Spring Meeting 2021, Proceedings, pp. 641–642. (2021.03)
• Tsubasa Sakai, Daisuke Morikawa, Tatsuya Hirahara, “Detection limit of sound images spatially split by interaural time and level difference,” ASJ Autumn Meeting 2020, Proceedings, pp. 577–578. (2020.09)

Poster Presentations

• Daisuke Morikawa, Tsubasa Sakai, Parham Mokhtari, “Effects of visual stimuli on auditory separation of sound images spatially split by synthesized binaural signal,” Acoustics’23, abstract 3pPPa8, J. Acoust. Soc. Am. 154(4) Pt 2, p. A235. (2023.12)
• Daisuke Morikawa, Tsubasa Sakai, Parham Mokhtari, “Effect of the frequency band on spatially splitting sound image by interaural time and level differences,” Proc. 24th International Congress on Acoustics, ABS-0751. (2022.10)
• Tsubasa Sakai, Daisuke Morikawa, Parham Mokhtari, Tatsuya Hirahara, “Detection limit of sound images spatially split by interaction of interaural time and level difference,” Symposium on study of sound 2021, IPSJ SIGMUS, 2021-MUS-131(24), pp. 1–3. (2021.06)
• Tsubasa Sakai, Daisuke Morikawa, Tatsuya Hirahara, “The effects of stimulus frequency range on detection limit of sound images spatially split by interaural difference,” Symposium on study of sound 2020, IPSJ SIGMUS, 2020-MUS-127(23), pp. 1–2. (2020.06)
• Daisuke Morikawa, Tsubasa Sakai, Tatsuya Hirahara, “Crosstalk of headphone amplifier used in psychoacoustical experiments,” ASJ Spring Meeting 2020, Proceedings, pp. 567–568. (2020.03)