学術論文　Journals

1. Ahmad Akmal Aminuddin, Masaya Fujisawa, "Efficient and Secure Secret Sharing-Based Data Outsourcing Suitable for Internet of Things Environments," Elsevier Internet of Things, vol. 32, p. 101645, July 2025. 10.1016/j.iot.2025.101645 

2. Masaya Fujisawa, Tatsuya Kamikawa, Ahmad Akmal Aminuddin, "Flight models considering wind effects on drone-based networks during large-scale disasters," IEICE Communications Express (ComEx), vol. 14, no. 8, pp. 326-329, July 2025.  10.23919/comex.2025XBL0073 

3. Ahmad Akmal Aminuddin, Masamune Okada, Masaya Fujisawa, "Privacy-Preserving Keyword Search With Access Control for Secret Sharing-Based Data Outsourcing," IEEE Access, vol. 13, pp. 73625-73651, 2025. 10.1109/ACCESS.2025.3562667

4. Yoshihiko Tsuchiya, Norisato Suga, Kazunori Uruma, Masaya Fujisawa, "Active Element Arrangement for Deep Learning-Based CSI Prediction in IRS-Assisted Systems," IEEE Access, vol. 13, pp. 2829-2843, 2025. 10.1109/ACCESS.2024.3524218

5. Ahmad Akmal Aminuddin, Masaya Fujisawa, "Improved protocols for secure multiplication using secret sharing scheme," ICT Express, vol. 10, no. 5, pp. 1019-1025, August 2024. 10.1016/j.icte.2024.07.009

6. Yoshihiko Tsuchiya, Norisato Suga, Kazunori Uruma, Masaya Fujisawa, "Image-Driven Reflection Pattern Selection for Standalone IRS Control," IEICE Communications Express, vol. 13, no. 12, pp. 517-520, December 2024. 10.23919/comex.2024XBL0155

7. Yuki Kawahara, Ahmad Akmal Aminuddin, Masaya Fujisawa, "Lightweight Information-Sharing System with Access Control in Disaster Management with Security against Dishonest Users," Journal of Signal Processing, vol. 28, no. 4, pp. 161-164, 2024. 10.2299/jsp.28.161

8. Yoshihiko Tsuchiya, Norisato Suga, Kazunori Uruma, Masaya Fujisawa, "IRS Reflection Pattern Prediction Considering Receiver's Movement Speed,"  Journal of Signal Processing, vol. 27, no. 4, pp. 107-110, July 2023.  10.2299/jsp.27.107

9. Shuya Nakamura, Masaya Fujisawa, Takako Akakura, "Practice and Evaluation of a Class Improvement Support System Using a Hierarchical Item Bank in Every Lesson," Journal of Japanese Society for Engineering Education, vol. 67, no. 1, pp. 69-74, January 2019. (In Japanese) 10.4307/jsee.67.1_69

10. Shojiro Sakata, Masaya Fujisawa, "Fast decoding of dual multi-point codes from algebraic curves up to the Kirfel-Pellikaan bound," IEEE Transactions on Information Theory, vol. 64, no. 6, pp. 4452-4466, June 2018.  10.1109/TIT.2018.2807478

11. Shojiro Sakata, Masaya Fujisawa, "Fast Decoding of Multipoint Codes from Algebraic Curves," IEEE Transactions on Information Theory, vol. 60. no. 4, pp. 2054-2064, April 2014. 10.1109/TIT.2014.2300473

12. Shojiro Sakata, Masaya Fujisawa, "Can the BMS algorithm decode up to $lfloor frac{d_G-g-1}{2}floor$ errors? Yes, but with some additional remarks," IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, vol. E-93A, no. 4, pp. 857-862, April 2010. 10.1587/transfun.E93.A.857

13. Masaya Fujisawa, Shojiro Sakata, "A Construction of High Rate Quasi-Cyclic Regular LDPC Codes from Cyclic Difference Families with Girth 8," IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, vol. E-90A, no. 5, pp. 1055-1061, May 2007. 10.1093/ietfec/e90-a.5.1055

14. Masaya Fujisawa, Shunsuke Maeda, Shojiro Sakata, "Compound-error-correcting codes and their augmentation,"  IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, vol. E-86A, no. 7, pp. 1813-1819, July 2003. 

15. Masaya Fujisawa, Shojiro Sakata, "A fast erasure deletion generalized minimum distance decoding for one-point algebraic-geometry codes," IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, vol. E-84A, no. 10, pp. 2376-2382, October 2001. 

16. Masaya Fujisawa, Shojiro Sakata, "Constrained m-D Shift-Register Synthesis: Fast GMD Decoding of One-Point Algebraic Geometry Codes," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (Japanese edition), vol. J-84A, no. 3, pp. 360-373, March 2001.  (In Japanese)

17. Yukio Numakami, Masaya Fujisawa, Shojiro Sakata, "Reed-Solomon符号のリスト復号のための高速補間法," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (Japanese edition), vol.  83, no. 11, pp. 1309-1317, November 2000.  (In Japanese)

18. Yutaka Kobayashi, Masaya Fujisawa, Shojiro Sakata, "Constrained Shift-Register Synthesis: Fast GMD Decoding of ID Algebraic Codes," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (Japanese edition), vol. J81-A, no. 10, pp. 1422-1430, October 1998. (In Japanese)

国際会議　Conference Proceedings

1. Takuta Miya, Ahmad Akmal Aminuddin, Masaya Fujisawa, "Implementing XAI for enhanced network anomaly detection with unknown attacks," in the Proceedings of the 2025 IEEE 14th Global Conference on Consumer Electronics (GCCE), 2025.

2. Yoshihiko Tsuchiya, Norisato Suga, Kazunori Uruma, Masaya Fujisawa, "Active Element Arrangement and Prediction Model for Channel Estimation in IRS-Assisted Systems,"  in the Proceedings of the IEEE Region 10 International Conference TENCON 2024, December 2024.

3. Masamune Okada, Ahmad Akmal Aminuddin, Masaya Fujisawa, "Secure User Authentication With Secret Sharing and Smart Contract for Permissioned Blockchain," in the Proceedings of the 2024 IEEE 13th Global Conference on Consumer Electronics (GCCE), October 2024.

4. Yuki Kawahara, Masaya Fujisawa, Ahmad Akmal Aminuddin, "Secure Information Sharing With Access Control and Tamper Detection for Drone-Based Disaster Management," in the Proceedings of the 2024 IEEE 13th Global Conference on Consumer Electronics (GCCE), October 2024.

5. Yoshihiko Tsuchiya, Norisato Suga, Kazunori Uruma, Masaya Fujisawa, "IRS Controlling Method With Machine Learning Based on Position Information," in the Proceedings of the 2024 IEEE 13th Global Conference on Consumer Electronics (GCCE), October 2024.

6. Yoshihiko Tsuchiya, Norisato Suga, Kazunori Uruma, Masaya Fujisawa, "Prediction Model for IRS Channel Estimation Using CNN with Frequency Domain," in the Proceedings of the 2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2024), March 2024.

7. Yuki Kawahara, Masaya Fujisawa, Ahmad Akmal Aminuddin, "A lightweight information sharing system with access control in disaster management with security against dishonest users," in the Proceedings of the 2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2024), March 2024.

[Student Paper Award 2024: Yuki Kawahara]

8. Yuki Kawahara, Masaya Fujisawa, Ahmad Akmal Aminuddin, "Cost-Efficient and Secure Information Sharing System with Access Control for Wireless Drone Networks," in Proceedings of International Conference on Emerging Technologies for Communications (ICETC) 2023, November 2023.

9. Yasuhiro Kan, Kazuma Aoi, Ahmad Akmal Aminuddin, Masaya Fujisawa, "Traceable Parcels Delivery System Using Blockchain Network," in Proceedings of International Conference on Emerging Technologies for Communications (ICETC) 2023, November 2023. 

10. Ahmad Akmal Aminuddin, Masamune Okada, Masaya Fujisawa, "Keyword-Based Searchable Encryption using Threshold Secret Sharing," in Proceedings of International Conference on Emerging Technologies for Communications (ICETC) 2023, November 2023. 

11. Makoto Osawa, Norisato Suga, Yoshihiko Tsuchiya, Masaya Fujisawa, "3D indoor positioning system using tensor rank minimization based radio map interpolation," in Proceedings of the 2023 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2023), March 2023.

12. Yoshihiko Tsuchiya, Norisato Suga, Kazunori Uruma, Masaya Fujisawa, "IRS Reflection Pattern Prediction Considering Receiver’s Moving Speed," in Proceedings of the 2023 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2023), March 2023.

[Student Paper Award 2023: Yoshihiko Tsuchiya]

13. Yoshihiko Tsuchiya, Norisato Suga, Kazunori Uruma, Kazuto Yano, Yoshinori Suzuki, Masaya Fujisawa, "WLAN Throughput Prediction Using Deep Learning with Throughput, RSS, and COR," in 2022 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), November 2022. 

14. Yoshihiko Tsuchiya, Norisato Suga, Kazunori Uruma, Masaya Fujisawa, "LSTM-based Spectral Efficiency Prediction by Capturing Wireless Terminal Movement in IRS-Assisted Systems," in IEEE 95th Vehicular Technology Conference (IEEE VTC), August 2022. 

15. Kouki Hori, Masaya Fujisawa, Nari Tababe, "Nonlinear SVM-Type Automaric Dicision Algorithm In Noisy Environment For Hammering Test System," in Proceedings of the Asia Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC), December 2021.

16. Hiroyoshi Morita, Masaya Fujisawa, Shojiro Sakata, "Two-dimensional Lee-Error-Correcting Codes on Hexagonal Signal Constellations," in Proceedings of the IEEE Information Theory Workshop (IEEE ITW), November 2021. 

17. Tomoka Seki, Masaya Fujisawa, "Joint Decoding of Low-density Parity-check Codes for Cyclic Gaussian Interference Channels," in Proceedings of the 2018 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2018), March 2018.

18. Keisuke Yamaguchi, Masaya Fujisawa, "Secure full-text search using addition homomorphic encryption," in Proceedings of the 2018 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2018), March 2018.

19. Yutaka Fukuchi, Tomotaka Kimura, Takahiro Yoshida, Masaya Fujisawa, Eizo Uzu, "Analyses of all-optical gate switches employing quasi-phase matched devices: effects on pattern difference of domain inversion period error," in Proceedings of the 22nd MicroOptics Conference (MOC 2017), November 2017.

20. Yurina Imaji, Masaya Fujisawa, "Generating Summary Videos Based on Visual and Sound Information from Movies," in Proceedings of the Human Interface and the Management of Information: Information and Knowledge in Context(PartI), LNCS 9172, 17th International Conference, HCI International 2015, August 2015. [Springer]

21. Masaya Fujisawa, Shojiro Sakata, "Fast decoding of dual multipoint codes from algebraic curves up to the Kirfel-Pellikaan bound," in Proceedings of the 2015 Workshop on Coding and Cryptography, 2015.

22. Makoto Kuribara, Masaya Fujisawa, "Improved layered index-less indexed flash codes and their performances," in Proceedings of the 2013 RISP International Workshop on Nonlinear Circuits and Signal Processing (NCSP2013), March 2013.

23. Masaya Fujisawa, Shojiro Sakata, "Improved multipoint codes from Hermitian curves," in Proceedings of the International Symposium on Information Theory and its Applications, October 2012.

24. Masaya Fujisawa, Shojiro Sakata, "On a fast decoding of multipoint codes from algebraic curves," in Proceedings of the 2011 IEEE International Symposium on Information Theory, August 2011.

25. Mitsunori Yoshida, Masaya Fujisawa, Hiroyuki Yashima, "Redundancy news filtering based on similarity and dispatch time," in Proceedings of the 2008 RISP International Workshop on Nonlinear Circuits and Signal Processing (NCSP2008), March 2008.

26. Shojiro Sakata, Masaya Fujisawa, "A Comparison between WB Algorithm and BM Algorithm," in Proceedings of International Symposium on Information Theory and its Applications, October 2006.

27. Masaya Fujisawa, Shojiro Sakata, "A Class of Quasi-Cyclic Regular LDPC Codes from Cyclic Difference Families with Girth 8," in Proceedings of the 2005 IEEE International Symposium on Information Theory, September 2005.

28. Masaya Fujisawa, Shunsuke Maeda, Shojiro Sakata, "Augmentation and Decoding of Compound-error-correcting codes," in Proceedings of 2003 IEEE International Symposium on Information Theory, July 2003.

著書　Books

1. 福岡 みなみ(著),藤沢 匡哉(監修). リケジョ福岡みなみの親子プログラミング教室, ISBN: 9784528023130, 日東書院本社, September 2020.

2. 阪田省二郎, 栗原正純, 松井一, 藤沢匡哉. 誤り訂正符号入門（第2版）, ISBN: 978-4-627-81712-8, 森北出版, April 2019.

3. 赤倉貴子, 浜田知久馬, 八嶋弘幸, 太原育夫, 谷口行信, 古川利博, 宮部博史，石井隆稔，渡邉均，塩濱敬之，佐藤寛之，寒水孝司，高橋智博，細谷剛，藤沢匡哉，池口徹，藤原寛太郎，池辺淑子，奥野貴之，立川智章. 情報工学, ISBN: 978-4-621-30285-9, 丸善出版, April 2018.

4. 阪田省二郎, 栗原正純, 松井一, 藤沢匡哉. 誤り訂正符号入門（第2版）, ISBN: 978-4-627-81711-1, 森北出版, October 2005.