Papers - OKAZAKI Naonobu
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Study of an Image-Based CAPTCHA that is Resistant to Attacks Using Image Recognition Systems Reviewed
Nishikawa S., Usuzaki S., Aburada K., Yamaba H., Katayama T., Park M., Okazaki N.
Lecture Notes in Electrical Engineering 1114 LNEE 175 - 184 2023.10
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings) Publisher：Lecture Notes in Electrical Engineering
In today’s digital age, image-based CAPTCHAs are increasingly vulnerable to attacks using annotation services, which tag images and classify images according to their contents, or reverse image search services. To prevent such attacks, an image-based CAPTCHA was proposed that takes advantage of the fact that humans can correctly recognize images containing many discontinuous points, while existing image recognition systems misrecognize them. However, this CAPTCHA proved susceptible to attacks using noise reduction filters. The objective of the present study is to create a CAPTCHA using images that are resistant to such filters. Images used in the new CAPTCHA were realized by increasing the proportion of lines forming discontinuous surfaces in images. Experimental results demonstrated a human recognition rate of 95.8%, with the image recognition systems successfully identifying only one image overall. Moreover, when a noise reduction filter was applied, the recognition rate was lower than those reported in previous studies.
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Detection of Eye Misalignment Using an HMD with an Eye-tracking Capability Reviewed
Nagatomo Y., Uchida N., Ikeda T., Takatsuka K., Mukunoki M., Okazaki N.
Proceedings of International Conference on Artificial Life and Robotics 863 - 867 2023.2
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of International Conference on Artificial Life and Robotics
In this study, we implemented the Cover Test, a test method for diagnosing eye misalignment using a head-mounted display with an eye-tracking capability. Specifically, we created a virtual examination environment in a VR space. The eye-tracking technique collected eye movements immediately after the covering or uncovering of the eyes. Thus, we calculated the amount of eye deviation and developed a system to determine the presence and magnitude of strabismus and heterophoria.We assessed the system in the verification experiment by examining the consistency between the judgment results provided by this system and the clinical evaluation approach with the Maddox rod. The result was that we could verify the horizontal eye movements more accurately.
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Investigation of evacuation simulation from Tsunami considering road width in Aosima. Reviewed
Keita Nabeyama, Shotaro Usuzaki, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Proc. The 28th International Symposium on Artificial Life and Robotics 2023.1
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
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On an improvement of hand gesture recognition for realizing a user authentication system using s-EMG. Reviewed
Soichiro Ishibashi, Hisaaki Yamaba, Kentaro Aburada, Tetsuro Katayama, Naonobu Okazaki
Proc. The 28th International Symposium on Artificial Life and Robotics 2023.1
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
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A study of improving the safety of defense system based on whitelist. Reviewed
Tsubasa Waki, Shotaro Usuzaki, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Proc. The 28th International Symposium on Artificial Life and Robotics 2023.1
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
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Investigation of PIN authentication schemes resistant to video-based recording attacks. Reviewed
Ryo Masuzawa, Shotaro Usuzaki, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Mirang Park, Naonobu Okazaki
Proc. The 28th International Symposium on Artificial Life and Robotics 2023.1
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
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Development of an anti-peeping passcode keypad using color/shape cursors Reviewed
Ryo Masuzawa, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Proc. The 27th International Symposium on Artificial Life and Robotics OS-7 1038 - 1042 2022.1
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
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An Attempt at Data Augmentation for Realizing User Authentication Using s-EMG Signals Reviewed
Soichiro Ishibashi, Yuya Yamamoto, Hisaaki Yamaba, Kentaro Aburada, Tetsuro Katayama, Naonobu Okazaki
Proc. The 27th International Symposium on Artificial Life and Robotics OS-7 1043 - 1046 2022.1
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
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Proposal and Evaluation of a Gesture Authentication Method with Peep Resistance for Smartwatches Reviewed
Mirang Park, Kentaro Aburada, Naonobu Okazaki
The 9th International Symposium on Computing and Networking (CANDAR 2021) ( PDAA3-3 ) 359 - 364 2021.11
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
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Proposal of Jawi CAPTCHA Using Digraphia Feature of the Malay Language Reviewed
Hisaaki Yamaba, Ahmad Saiful Aqmal Bin Ahmad Sohaimi, Shotaro Usuzaki, Kentaro Aburada, Masayuki Mukunoki, Mirang Park, and Naonobu Okazaki
16th International Workshop on Security (IWSEC 2021), LNCS 12835, Springer ( PDAA3-3 ) 119 - 133 2021.11
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
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Performance Evaluation of Blockchain Based Agricultural Input Voucher System Reviewed
Isakwisa Gaddy Tende, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
2021 IEEE 10th Global Conference on Consumer Electronics, GCCE 2021 637 - 638 2021.10
Authorship：Last author Language：Japanese Publishing type：Research paper (international conference proceedings) Publisher：2021 IEEE 10th Global Conference on Consumer Electronics, GCCE 2021
Large portion of rural small-scale farmers in Tanzania can't afford to buy quality agricultural inputs (fertilizers and seeds), therefore the government of Tanzania provides these farmers with paper-based subsidy vouchers which allow them to buy the agricultural inputs at only half price. However, challenges like misuse of the vouchers by some government officials (stealing and favoritism in vouchers' allocation) and lack of trust (difficulty of verifying vouchers' authenticity) have resulted into low crop productivity for the farmers and loss of government funds. In our previous work, we developed agricultural input voucher system which stores and allocates digital subsidy vouchers to farmers in the Hyperledger Fabric blockchain network and we evaluated its performance based on transaction throughput and latency metrics which are important to farmers, who access the system through Short Message Service (SMS) in their mobile phones. The blockchain network's features such as hashing and digital signature prevent misuse and ensure trust of the digital vouchers. In this paper, we evaluate performance of the developed blockchain network based on resources (CPU and memory) consumption metrics which are important in planning resources during system deployment. The evaluation findings reveal that, Raft consensus protocol consumes resources more efficiently than Kafka consensus protocol.
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Development and Evaluation of Swahili Text Based CAPTCHA Reviewed
Isakwisa Gaddy Tende, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
IEEE 3rd Global Conference on Life Sciences and Technologies (LifeTech 2021) 297 - 301 2021.3
Language：English Publishing type：Research paper (international conference proceedings)
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Method for detecting eye misalignment based on movement near the center of the pupil Reviewed
Noriyuki Uchida, Kayoko Takatuka, Hisaaki Yamaba, Masayuki Mukunoki, Naonobu Okazaki
Proc. 2021 Int’l Conf. on Artificial Life and Robotics (ICAROB2021) 165 - 169 2021.1
Language：English Publishing type：Research paper (international conference proceedings)
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Development and evaluation of blockchain based agricultural input voucher system Reviewed
Isakwisa Gaddy Tende, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Proc. The 26th International Symposium on Artificial Life and Robotics OS-3 ( 1 ) 1 - 6 2021.1
Language：English Publishing type：Research paper (international conference proceedings)
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An attempt at an introduction of deep learning for a user authentication system using s-EMG Reviewed
Hisaaki Yamaba, Kenya Shiraishi, Shotaro Usuzaki, Kayoko Takatsuka, Kentaro Aburada, Tetsuro Katayama, Mirang Park, Naonobu Okazaki
Proc. The 26th International Symposium on Artificial Life and Robotics OS-3 ( 3 ) 1 - 5 2021.1
Language：English Publishing type：Research paper (international conference proceedings)
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Blockchain-based vote-type unknown malware detection method using a characteristic of anti-virus vendors' voting Reviewed
Hiroki Muranaka, Shotaro Usuzaki, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Mirang Park, Naonobu Okazaki
Proc. The 26th International Symposium on Artificial Life and Robotics OS-3 ( 2 ) 1 - 5 2021.1
Language：English Publishing type：Research paper (international conference proceedings)
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Evaluation of Yubimoji Based Gestures for Realizing User Authentication Method Using s-EMG Reviewed
Hisaaki Yamaba, Yuki Nagatomo, Shotaro Usuzaki, Kayoko Takatsuka, Kentaro Aburada, Tetsuro Katayama, Mirang Park, Naonobu Okazaki
Proceedings of the Workshops of the 34th International Conference on Advanced Information Networking and Applications (WAINA-2020) 834 - 844 2020.4
Language：English Publishing type：Research paper (international conference proceedings)
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Identification of Manual Alphabets Based Gestures Using s-EMG for Realizing User Authentication Reviewed
Hisaaki Yamaba, Shotaro Usuzaki, Kayoko Takatsuka, Kentaro Aburada, Tetsuro Katayama, Mirang Park, and Naonobu Okazaki
Int'l Conf. on Emerging Internetworking, Data & Web Technologies (EIDWT 2020) 323 - 333 2020.1
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
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Gait-Based Authentication using Anomaly Detection with Acceleration of Two Devices in Smart Lock Reviewed
Kazuki Watanabe, Makoto Nagatomo, Kentaro Aburada, Naonobu Okazaki, Mirang Park
Lecture Notes in Networks and Systems, Springer 97 ( 352 ) 362 2019.11
Language：English Publishing type：Research paper (international conference proceedings)
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Gait-Based Authentication for Smart Locks Using Accelerometers in Two Devices Reviewed
Kazuki Watanabe, Makoto Nagatomo, Kentaro Aburada, Naonobu Okazaki, Mirang Park
Advances in Networked-based Information Systems, Springer 1036 281 - 291 2019.9
Language：English Publishing type：Research paper (international conference proceedings)