論文 - 岡崎 直宣
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Optimal Weighted Voting-Based Collaborated Malware Detection for Zero-Day Malware: A Case Study on VirusTotal and MalwareBazaar 査読あり
Naonobu Okazaki, Shotaro Usuzaki, Tsubasa Waki, Hyoga Kawagoe, Mirang Park, Hisaaki Yamaba and Kentaro Aburada
Future Internet 16 ( 8 ) 259 2024年7月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
DOI： 10.3390/fi16080259
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Usability improvement in color constancy CAPTCHA 査読あり
Shotaro Usuzaki, Wang Yihan, Kentaro Aburada, Hisaaki Yamaba, Kayoko Takatsuka, Tetsuro Katayama, Mirang Park, and Naonobu Okazaki
IEICE Communications Express 2024年6月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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プロジェクト・スケジュールの遅延リスク分析のための手法の開発 査読あり
高塚佳代子, 佐藤知一, 油田健太郎, 岡崎直宣
化学工学論文集 49 ( 6 ) 159 - 165 2023年11月
担当区分：最終著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Takatsuka K., Nagatomo Y., Uchida N., Ikeda T., Mukunoki M., Okazaki N.
Journal of Robotics, Networking and Artificial Life 10 ( 1 ) 17 - 24 2023年10月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Robotics, Networking and Artificial Life
This study aimed to reduce the effect of the examining environment on accuracy by using an eye movement detection system, a VR head-mounted display. We reproduced the inspection environment in a virtual reality environment and performed the cover test, a basic inspection technique for tropia and phoria. We then developed a system that uses eye data collected by eye tracking to detect the directions and magnitudes of eye misalignment. The Maddox method, an existing testing procedure, was used to verify the accuracy. We have confirmed its effectiveness in detecting the directions and magnitudes of horizontal eye misalignment.
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Development of keypads which use colors or shapes to prevent shoulder surfing 査読あり
Ryo Masuzawa, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Artificial Life and Robotics 2023年8月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Artificial Life and Robotics
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Tsunami evacuation simulation considering road width in Aoshima district 査読あり
Keita Nabeyama, Shotaro Usuzaki, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama & Naonobu Okazaki
Artificial Life and Robotics 2023年7月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Artificial Life and Robotics
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Isakwisa Gaddy Tende, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama and Naonobu Okazaki
Agriculture 13 ( 3 ) 627 - 645 2023年3月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Artificial Life and Robotics
Most of the small-scale farmers in Tanzania can’t afford to buy quality agricultural inputs (fertilizers and seeds), therefore the Tanzanian government issues paper-based subsidy vouchers to farmers for buying the inputs at half price. However, challenges like misuse of the vouchers by some government officials (stealing and favoritism in allocation) and lack of trust (difficulty of verifying vouchers’ authenticity) have resulted into low crop productivity for the farmers and loss of government funds. To address this, we have developed agricultural input voucher system which stores and allocates digital subsidy vouchers to farmers in the Hyperledger Fabric blockchain network whose features like hashing and digital signature prevent misuse and ensure trust of the vouchers. Farmers access the digital vouchers through Short Message Service (SMS) in their mobile phones. Evaluation reveals that, the developed system is effective and meets performance demands of Tanzanian farmers. Also, Raft has better performance than Kafka consensus protocol.
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Development of Methods for Project Schedule Delay Risk Analysis 査読あり
Takatsuka K., Sato T., Aburada K., Okazaki N.
Kagaku Kogaku Ronbunshu 49 ( 6 ) 159 - 165 2023年
担当区分：最終著者 記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Kagaku Kogaku Ronbunshu
Since introducing the project management technique “earned value management” in the 1970s, planning and schedule management that balances the three factors of process, resources, and cost are now possible. However, delay risk has increased over the years because of the large-scale scope and changes in the surrounding environment. Therefore, besides the above three factors, preparation and management regarding delay risk are critical. However, many projects rely on the experience and intuition of directors to monitor risk. This study develops a project schedule management mechanism and system that analyzes delay risk besides processes, resources, and costs. A schedule network generation unit with multiple activities and a delay risk evaluation unit are included in the schedule management system to achieve this purpose. As a mechanism for managing delay risk, we propose a method that evaluates the margin (delay risk tolerance) of the total float of the schedule network that has a negative correlation with delay risk and a simple and accurate calculation method.
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Proposal for a blockchain based agricultural input voucher system 査読あり
Isakwisa Gaddy Tende, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Artificial Life and Robotics 27 461 - 471 2022年1月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Artificial Life and Robotics
Most of the small-scale farmers in Tanzania can’t afford to buy quality agricultural inputs (fertilizers and seeds), therefore the Tanzanian government issues paper-based subsidy vouchers to farmers for buying the inputs at half price. However, challenges like misuse of the vouchers by some government officials (stealing and favoritism in allocation) and lack of trust (difficulty of verifying vouchers’ authenticity) have resulted into low crop productivity for the farmers and loss of government funds. To address this, we have developed agricultural input voucher system which stores and allocates digital subsidy vouchers to farmers in the Hyperledger Fabric blockchain network whose features like hashing and digital signature prevent misuse and ensure trust of the vouchers. Farmers access the digital vouchers through Short Message Service (SMS) in their mobile phones. Evaluation reveals that, the developed system is effective and meets performance demands of Tanzanian farmers. Also, Raft has better performance than Kafka consensus protocol.
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リレーアタック耐性とボット耐性の両立を目指したインタラクティブな動画CAPTCHAの提案と評価 査読あり
油田健太郎, 臼崎翔太郎, 山場久昭, 片山徹郎, 椋木雅之, 朴美娘, 岡崎直宣
情報処理学会論文誌 62 ( 12 ) 1864 - 1878 2021年12月
担当区分：最終著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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スマートロックにおける二端末による機械学習を用いた歩行認証に関する研究 査読あり
朴美娘, 渡辺一樹, 油田健太郎, 岡崎直宣
情報処理学会論文誌 62 ( 12 ) 2011 - 2023 2021年12月
担当区分：最終著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Development of a System to Detect Eye Position Abnormality based on Eye-Tracking 査読あり
Noriyuki Uchida, Kayoko Takatuka, Hisaaki Yamaba, Masayuki Mukunoki, Naonobu Okazaki
Journal of Robotics, Networks and Artificial Life, Atlantis Press 8 ( 3 ) 205 - 210 2021年12月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Proposal for a Crop Protection Information System for Rural Farmers in Tanzania 査読あり
Isakwisa Gaddy Tende, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Agronomy 11 ( 12 ) 1 - 17 2021年11月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Proposal and Evaluation for Color Constancy CAPTCHA 招待あり 査読あり
Shotaro Usuzaki, Kentaro Aburada, Tetsuro Katayama, Masayuki Mukunoki, Mirang Park, Naonobu Okazaki
Journal of Artificial Life and Robotics, Springer 26 ( 3 ) 291 - 296 2021年3月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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主観的輪郭を用いた回転3Dテキスト型CAPTCHAの提案 査読あり
臼崎翔太郎，油田健太郎，山場久昭，片山徹郎，椋木雅之，朴美娘，岡崎直宣
電子情報通信学会論文誌B J103-B ( 8 ) 332 - 343 2020年8月
担当区分：最終著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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On a user authentication methods to realize an authentication system using s-EMG 査読あり
Hisaaki Yamaba, Shotaro Usuzaki, Kayoko Takatsuka, Kentaro Aburada, Tetsuro Katayama, Mirang Park, Naonobu Okazaki
International Journal of Grid and Utility Computing 11 ( 5 ) 725 - 734 2020年8月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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On a user authentication method to realise an authentication system using s-EMG 査読あり
Yamaba H., Usuzaki S., Takatsuka K., Aburada K., Katayama T., Park M., Okazaki N.
International Journal of Grid and Utility Computing 11 ( 5 ) 725 - 734 2020年8月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Grid and Utility Computing
To prevent shoulder-surfing attacks, we proposed a user authentication method using surface electromyogram (s-EMG) signals, which can be used to identify who generated the signals and which gestures were made. Our method uses a technique called 'pass-gesture', which refers to a series of hand gestures, to achieve s-EMG-based authentication. However, it is necessary to introduce computer programs that can recognise gestures from the s-EMG signals. In this paper, we propose two methods that can be used to compare s-EMG signals and determine whether they were made by the same gesture. One uses support vector machines (SVMs), and the other uses dynamic time warping. We also introduced an appropriate method for selecting the validation data used to train SVMs using correlation coefficients and cross-correlation functions. A series of experiments was carried out to confirm the performance of those proposed methods, and the effectiveness of the two methods was confirmed.
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An evaluation of the interactive video CAPTCHA method against automated attack 査読あり
Kentaro Aburada, Shotaro Usuzaki, Hisaaki Yamaba, Tetsuro Katayama, Masayuki Mukunoki, Mirang Park, Naonobu Okazaki
IEICE Communications Express 8 ( 12 ) 453 - 457 2019年12月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Implementation of CAPTCHA suitable for mobile devices 査読あり
Kentaro Aburada, Shotaro Usuzaki, Hisaaki Yamaba, Tetsuro Katayama, Masayuki Mukunoki, Mirang Park, Naonobu Okazaki
IEICE Communications Express 8 ( 12 ) 601 - 605 2019年12月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Personal Identification with Any Shift: Authentication method for smartwatches having shoulder-surfing resistance 査読あり
Makoto Nagatomo, Kazuki Watanabe, Kentaro Aburada, Naonobu Okazaki, Mirang Park
IEICE Communications Express 8 ( 12 ) 495 - 500 2019年12月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）