論文 - 山場 久昭
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青島地区における災害時の避難行動に関するシミュレーション
臼崎 翔太郎, 藤井 貴大, 山場 久昭, 油田 健太郎, 岡崎 直宣
宮崎大学工学部紀要 ( 47 ) 215 - 219 2018年7月
記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）
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Color CAPTCHAのための色妨害画像に対する色恒常性の成立度合いの検討
臼崎 翔太郎, 中原 裕介, 山場 久昭, 油田 健太郎, 岡崎 直宣
宮崎大学工学部紀要 ( 47 ) 211 - 214 2018年7月
記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）
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トラフィック特性による正当なユーザと DDoS 攻撃の識別手法の提案
臼崎 翔太郎, 有川 佑樹, 山場 久昭, 油田 健太郎, 岡崎 直宣
宮崎大学工学部紀要 ( 47 ) 201 - 210 2018年7月
記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）
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Java プログラムのデータ遷移可視化ツール TFVIS の開発 査読あり
佐藤 拓弥、片山徹郎、喜多 義弘、山場久昭、油田健太郎、岡崎 直宣
情報処理学会論文誌 59 ( 4 ) 1137 - 1149 2018年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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RETUSS: Ensuring Traceability System between Class Diagram in UML and Java Source Code in Real Time 査読あり
Tetsuro Katayama, Keisuke Mori, Yoshihiro Kita, Hisaaki Yamaba, Kentaro Aburada and Naonobu Okazaki
Journal of Robotics, Networks and Artificial Life 5 ( 2 ) 114 - 117 2018年4月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Yamaba H., Kurogi T., Aburada K., Kubota S., Katayama T., Park M., Okazaki N.
Artificial Life and Robotics 23 ( 1 ) 87 - 93 2018年3月
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：Artificial Life and Robotics
© 2017, ISAROB. At present, mobile devices such as tablet-type PCs and smart phones have widely penetrated into our daily lives. Therefore, an authentication method that prevents shoulder surfing is needed. We are investigating a new user authentication method for mobile devices that uses surface electromyogram (s-EMG) signals, not screen touching. The s-EMG signals, which are detected over the skin surface, are generated by the electrical activity of muscle fibers during contraction. Muscle movement can be differentiated by analyzing the s-EMG. Taking advantage of the characteristics, we proposed a method that uses a list of gestures as a password in the previous study. In this paper, we introduced support vector machines (SVM) for improvement of the method of identifying gestures. A series of experiments was carried out to evaluate the performance of the SVM based method as a gesture classifier and we also discussed its security.
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Evaluation of Index Poisoning Method in Large Scale Winny Network 査読あり
K.Aburada, Y. Kita, H.Yamaba, T.Katayama, M. Park, N.Okazak
The 6th International Conference on Emerging Internet, Data & Web Technologies 999 - 1006 2018年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
In recent years, P2P file-sharing networks are used all over the world. This has led to social problems such as the illegal distribution of copyrighted material and the leakage of personal information through computer viruses because P2P does not have a control function for file distribution. To address these issues, a control method called index poi- soning has been studied. However, problems such as pollution in the net- work index and a need to increment control traffic have been reported when index poisoning is applied to a P2P file-sharing network. We pro- pose a method that implements dynamic clustering to limit the range of index poisoning as a solution for these problems that also maintains the effectiveness of the control function. In this study, we implement index poisoning on the large-scale Winny network and evaluate the system performance.
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An Examination of CAPTCHA for Tolerance of Relay Attacks and Automated Attacks 査読あり
R. Tatsuda, H.Yamaba, K.Aburada, T.Katayama, M. Park, N. Shiratori, N.Okazak
The 6th International Conference on Emerging Internet, Data & Web Technologies 870 - 879 2018年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
CAPTCHA is a type of challenge response test used to dis- tinguish human users from malicious computer programs such as bots, and is used to protect email, blogs, and other web services from bot attacks. So far, research on enhance of CAPTCHA’s resistance to bot attacks has been proceeded to counter advanced automated attacks method. However, an attack technique known as a relay attack has been devised to circumvent CAPTCHA. In this attack, since human solves CAPTCHA, the existing measures assuming bots have no effect on this attack. We designed a new CAPTCHA scheme for relay attacks tolerance and automated attacks tolerance. In this paper, we tested the robustness of the proposed method against several types of automated attacks. We constructed an experimental environment in which a relay attack can be simulated, and designed a series of experiments to evaluate the perfor- mance of the proposed method. As a result, we found that the proposed CAPTCHA scheme offers some of level of resistance to automated attacks and relay attacks.
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A Study on a User Identification Method Using Dynamic Time Warping to Realize an Authentication System by s-EMG 査読あり
T. Kurogi, H.Yamaba, K.Aburada, T.Katayama, M. Park, N.Okazak
The 6th International Conference on Emerging Internet, Data & Web Technologies 889 - 900 2018年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
At the present time, mobile devices such as tablet-type PCs and smart phones have widely penetrated into our daily lives. Therefore, an authentication method that prevents shoulder surfing is needed. We are investigating a new user authentication method for mobile devices that uses surface electromyogram (s-EMG) signals, not screen touching.
The s-EMG signals, which are detected over the skin surface, are generated by the electrical activity of muscle fibers during contraction. Muscle movement can be differentiated by analyzing the s-EMG. Taking advantage of the characteristics, we proposed a method that uses a list of gestures as a password in the previous study. In this paper, we intro- duced dynamic time warping (DTW) for improvement of the method of identifying gestures. -
Prototype of a Tool to Defect Specific Comments 査読あり
S. Tanoue, T. Katayama, Y. Kita, H. Yamaba, K. Aburada, and N. Okazaki
Proceedings of International Conference on Artificial Life and Robotics (ICAROB 2017) 2018年2月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
This paper has developed a prototype of a tool to detect specific comments. With the prototype, you can use regular expressions, describe patterns of detected strings in a configuration file, and then detect specific comments. The prototype was applied to projects with 5,000 LOC (Lines of Code) or more. As a result, the recall rate achieved 100% and the precision rate achieved 80%. Reducing improper comments and comments detected by the prototype which express tasks remaining in the source code can improve understandability of the source code.
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Implementation of RETUSS to Ensure Traceability between Class Diagram in UML and Java Source Code in Real Time 査読あり
K. Mori, T. Katayama, Y. Kita, H. Yamaba, K. Aburada, and N. Okazaki
Proceedings of International Conference on Artificial Life and Robotics (ICAROB 2017) 2018年2月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
Ensuring of the traceability of deliverables is one of effective methods to secure the quality of software. It can verify that the requirements are reflected in the programs. But it has two problems: taking much labor and time, and causing mistakes by human handling. This paper has implemented RETUSS (Real-time Ensure Traceability between UML and Source-code System) in order to solve the above two problems. RETUSS can ensure traceability between Class diagram in UML and Java source code in real time.
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A study on user identification method using cross-correlation and SVM to realize an authentication system by s-EMG 査読あり
T. Kurogi, H.Yamaba, K.Aburada, T.Katayama, M. Park, N.Okazak
International Symposium on Artificial Life and Robotics 462 - 467 2018年1月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Automated cover-uncover test system using active LCD shutter glasses 査読あり
N. Uchida, K. Takatsuka, K. Hinokuma, K. Hirata, H.Yamaba, N.Okazak
International Symposium on Artificial Life and Robotics 698 - 702 2018年1月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Introduction of traffic characteristics to distinguish legitimate user traffic from DDoS attack traffic 査読あり
Y. Arikawa, H.Yamaba, K.Aburada, T.Katayama, M. Park, N.Okazak
International Symposium on Artificial Life and Robotics 484 - 489 2018年1月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Evaluation of farmers market information system to connect with some social stakeholders
Tende I., Kubota S., Yamaba H., Aburada K., Okazaki N.
Journal of Information Processing 26 ( 0 ) 247 - 256 2018年1月
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：Journal of Information Processing
© 2018 Information Processing Society of Japan. A large part of the population in Tanzania consists of rural smallholder farmers. Due to lack of market information, farmers sell crops to middlemen at lower prices and hence don’t get enough profits. Previously we developed a WEB and SMS (Short Message Service) based Farmers Market Information System using a Waterfall model which automatically replies to farmers’ requests for market prices of crops through SMS. We then improved the system so that, farmers can access crop buyers’ details and crop demand reports through SMS while crop buyers can access farmers’ details and crop demand reports through SMS or WEB. We also evaluated the effectiveness of the system to crop buyers’ incomes and times for accessing market information after implementing the system in Tanzania in the SWAHILI language. In this paper we further evaluate the system effectiveness. Findings reveal that the system helped farmers to get improved incomes and access market information in shorter times. The system also helped farmers and crop buyers to sell and buy larger quantities of crops respectively. The findings also reveal that young people can learn and use the system more easily than old people. Users can also easily learn and use the system if they can read and write in the SWAHILI language regardless of their education levels.
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Usuzaki S., Arikawa Y., Yamaba H., Aburada K., Kubota S., Park M., Okazaki N.
Journal of Information Processing 26 ( 0 ) 257 - 266 2018年1月
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：Journal of Information Processing
© 2018 Information Processing Society of Japan. Distributed Denial-of-Service (DDoS) attack detection systems are classified into a signature based approach and an anomaly based approach. However, such methods tend to suffer from low responsiveness. On the other hand, real-time burst detection which is used in data mining offers two advantages over traditional statistical methods. First, it can be used for real-time detection when an event is occurring, and second, it can work with less processing as information about events are compressed, even if a large number of events occur. Here, the authors add the function for attack detection in real-time burst detection technique, and propose a highly responsive DDoS attack detection technique. This paper performs experiments to evaluate its effectiveness, and discusses its detection accuracy and processing performance.
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An examination of the interactive video CAPTCHA method to resist relay attack
Tatsuda Ryohei, Aburada Kentaro, Yamaba Hisaaki, Katayama Tetsuro, Mukunoki Masayuki, Park Mirang, Okazaki Naonobu
IEICE Communications Express 7 ( 4 ) 136 - 141 2018年
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：一般社団法人 電子情報通信学会
CAPTCHA is a kind of challenge response test, which is used to distinguish human users from malicious computer program such as bots. However, the attack technique called relay attack as a method to avoid the CAPTCHA has been devised. This attack relays the CAPTCHA challenges to remote human-solvers, let them to decode CAPTCHA challenges. We used delay time that is caused by communications needed in relay attack. Our new CAPTCHA uses this delay time between communications to prevent relay attacks. We constructed an experimental environment in which relay attack can be simulated, made a series of experiments in order to evaluate the performance of the proposed method.
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Development of a Monitoring System Based on Power Consumption 査読あり
Kentaro Aburada, Kengo Todaka, Hisaaki Yamaba, Tetsuro Katayama, Mirang Park, Norio Shiratori et al.
The 20th International Conference on Network-Based Information Systems (NBiS-2017) 363 - 372 2017年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Highly Responsive Distributed Denial-of-Service Attacks Detection by Using Real-Time Burst Detection Method 査読あり
Shotaro Usuzaki, Yuki Arikawa, Hisaaki Yamaba, Kentaro Aburada, Shin-Ichiro Kubota, Mirang Park et al.
The 20th International Conference on Network-Based Information Systems (NBiS-2017) 914 - 923 2017年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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DDoS攻撃ログデータ解析による人と攻撃通信判別に関する研究
橘弘智, 有川祐樹, 臼崎翔太郎, 久保田真一郎, 高塚佳代子, 山場久昭, 岡崎直宣
宮崎大学工学部紀要 ( 46 ) 239 - 246 2017年7月
記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）