論文 - 油田 健太郎
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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
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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Study of an Image-Based CAPTCHA that is Resistant to Attacks Using Image Recognition Systems 査読あり
Nishikawa S., Usuzaki S., Aburada K., Yamaba H., Katayama T., Park M., Okazaki N.
Lecture Notes in Electrical Engineering 1114 LNEE 175 - 184 2023年10月
担当区分：責任著者 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：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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Proposal of Fill in the Missing Letters CAPTCHA Using Associations from Images 査読あり
Yamaba H., Mustaza M.N.F.B., Usuzaki S., Aburada K., Mukunoki M., Park M., Okazaki N.
Lecture Notes in Electrical Engineering 1114 LNEE 206 - 217 2023年10月
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Lecture Notes in Electrical Engineering
This paper proposes a new fill in the missing letters type CAPTCHA using associations from images. Many web sites have adopted CAPTCHA to prevent bots and other automated programs from malicious activities such as posting comment spam. Text-based CAPTCHA is the most common and earliest CAPTCHA. But as optical character recognition (OCR) technology has improved, the intensity of distortions that must be applied to a CAPTCHA for it to remain unrecognizable by OCR has increased. This has reached a point where humans are having difficulty recognizing CAPTCHA text. The idea of the proposed CAPTCHA asks users to spell a word by filling some blanks. Since the number of shown letters are few, it is difficult to answer the correct word. But one or more images that can be used as hints to guess what is the answer word are also shown to the users. A series of experiments was carried out to evaluated the performance of the proposed CAPTCHA. First, a computer program was developed with various software languages for the usability evaluation. The system was used for the experiments to find the suitable parameters of the CAPTCHA such as numbers of letters that will be disclosed, position of disclosed letters. Next, security evaluation experiments were carried out using the system under the obtained parameters. The results of the experiments showed that the performance and limitation of the proposed CAPTCHA.
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Proposal of a DDoS Attack Detection Method Using the Communication Interval 査読あり
Iwasa K., Usuzaki S., Aburada K., Yamaba H., Katayama T., Park M., Okazaki N.
Lecture Notes in Electrical Engineering 1114 LNEE 165 - 174 2023年10月
担当区分：責任著者 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Lecture Notes in Electrical Engineering
As the scale of Distributed Denial of Service (DDoS) attacks has been escalating in recent years, the need for real-time detection of attacks has increased. Existing intrusion detection systems (IDSs) perform detection with a fixed window size (assumed to be in hours). In previous research, attack detection was performed by preparing windows of multiple sizes, selecting the appropriate window based on the state of the data, and using features learned in advance for that window size. Although this method yielded a high DDoS attack detection rate of 98.30%, it exhibited a considerable false-positive rate of 7.37%. The proposed method measures the communication intervals of identical packets within the window, identified as attack-related in the previous survey, and classifies those packets with an average communication interval below a set threshold as attacks. The experiment resulted in a 50.2% decrease in the false-positive rate.
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Analysis of Self Determination Factors for Continuance Intention on Online Learning Management System 査読あり
Saputra Mochamad Chandra, Katayama Tetsuro, Kita Yoshihiro, Yamaba Hisaaki, Aburada Kentaro, Okazaki Naonobu, Wicaksono Satrio Agung
Journal of Robotics, Networking and Artificial Life 10 ( 1 ) 91 - 95 2023年9月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：株式会社 ALife Robotics
The COVID-19 pandemic outbreak transformed the paradigm of the educational process. Many educational institutions, including the University, mainly the Faculty of Computer Science, Brawijaya University, have experienced success with learning through the Internet. The continuance intention factor for using an online learning management system is important to ensure learning sustainability. This study investigates continuance intention factor by using self determination model as a research model. The objective of this study is to find the factor factors affecting students' continuance intention toward online learning management systems. The proposed model is useful for investigating continuance intention factors. The study finds that intrinsic regulation, external regulation, identified regulation, and introjected regulation significantly positive impact on continuance intention in learning management systems. Finally, this study provides suggestions for the Faculty to improve the continuance intention of the student in using an online learning management system.
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Development of keypads which use colors or shapes to prevent shoulder surfing 査読あり
Masuzawa R., Aburada K., Yamaba H., Katayama T., Okazaki N.
Artificial Life and Robotics 28 ( 4 ) 710 - 717 2023年8月
担当区分：責任著者 掲載種別：研究論文（学術雑誌） 出版者・発行元：Artificial Life and Robotics
In conventional smart phones and ATMs, a four-digit passcode is entered into a keypad, and the user confirms whether the passcode matches the keypad. However, there is a risk that a third party can easily steal the password by watching the code entry or analyzing the position of fingerprints left on the keypad. There are other solutions, such as biometric authentication or the use of special displays, but both of them are costly and difficult to implement. In this study, we propose a keypad that does not leave fingerprints on the screen, is low cost, and can be used to input passcodes without worry, even if someone is standing next to it. The proposed keypad uses cursors that are moved by directional keys to select numbers, making fingerprint analysis difficult. Because attackers do not know the color that the user has selected, they cannot know which cursor the user is moving. To verify the safety and convenience of this system, we conducted experiments on subjects in their 20 s and 50 s. The results showed that the average difference in authentication time from the conventional method was about 5 s, and the method was generally convenient. We conclude that our keypad system is secure, because no peeping attacks on a subject were successful in guessing the subject’s passcode.
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Tsunami evacuation simulation considering road width in Aoshima district 査読あり
Nabeyama K., Usuzaki S., Aburada K., Yamaba H., Katayama T., Okazaki N.
Artificial Life and Robotics 28 ( 4 ) 779 - 788 2023年7月
担当区分：責任著者 掲載種別：研究論文（学術雑誌） 出版者・発行元：Artificial Life and Robotics
Japan is one of the countries in the world where natural disasters occur most frequently. Typhoons, earthquakes, tsunamis, volcanic eruptions, and many other natural disasters occur in Japan every year, and the risks are immeasurable. Japan is especially prone to earthquakes because of its location on the North American Plate, Eurasian Plate, Pacific Plate, and Philippine Sea Plate. Preparation for a Nankai Trough earthquake is one of the most important issues. A Nankai trough earthquake is predicted to occur with a probability of 70–80% within 30 years. Accordingly, a tsunami of more than 10 ms is expected to hit a wide area along the Pacific coast from the Kanto region to the Kyushu region, and the impact is expected to be significant. When a tsunami warning is issued, an evacuation support system that provides information on evacuation sites and routes enables faster and safer evacuation actions. In a previous study conducted in our laboratory, we proposed an evacuation support system using Low-Power Wide-Area communications and conducted a simulation to find ways to improve the evacuation support system. However, the simulation was insufficient in that it did not consider delays in evacuation completion time due to road congestion caused by limited road width, which can be expected in an actual disaster. In our current research, as an improvement to make the simulation more realistic for further developing our evacuation support system, we propose a simulation that considers road width. We examined how adoption of this simulation methodology would affect the simulation results by comparing simulations that did and did not consider road width. As a result, the proposed method showed a lower percentage of completed evacuations than the previous simulation, especially for children and the elderly. The reason for this result is that when evacuations begin simultaneously, crowding occurs as people all rush to evacuation centers. This congestion on the roads near evacuation centers prevents people from completing their evacuations. Such a phenomenon is expected to occur not only in simulations but also on actual roads. For this reason, our proposed simulation method that considers road width is a more realistic simulation. Since evacuations by car in the event of a disaster also occur, a future issue is to simulate car congestion as well. Furthermore, simulating what would happen if a disaster made a road impassable is also important.
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画像と視線入力装置を用いたユーザ認証方式の提案 査読あり
金井 秀真, 安浪 巧, 油田 健太郎, 岡崎 直宣, 朴 美娘
情報処理 学会マルチメディア，分散，協調とモバイルシンポジウム（DICOMO2023）論文集 538 - 543 2023年7月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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Prototype of the Framework CATdd to Support Continuous Development in Test Driven Development 査読あり
Miyashita Takeaki, Katayama Tetsuro, Kita Yoshihiro, Yamaba Hisaaki, Aburada Kentaro, Okazaki Naonobu
Journal of Advances in Artificial Life Robotics 4 ( 1 ) 35 - 40 2023年6月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：株式会社 ALife Robotics
TDD is a development methodology to improve software quality. In this study, we prototype the framework CATdd (Continuous Automated Test Driven Development), which supports continuous development with TDD. CATdd reduces the time of implementation step in TDD by generating new source code that passes tests using LLM. CATdd maintains consistency with other source code in the project by using existing source code and related source code to prompt. As a result of the evaluation experiments, the time for the implementation step in TDD was reduced by 94% for a simple task and by 56% for another more complex task. In conclusion, CATdd is useful to support continuous development.
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Development and Evaluation of a Deep Learning Based System to Predict District-Level Maize Yields in Tanzania 査読あり
Isakwisa Gaddy Tende, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Agriculture (MDPI) 13 ( 3 ) 2023年3月
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Saputra M.C., Katayama T., Kita Y., Yamaba H., Aburada K., Okazaki N.
Proceedings of International Conference on Artificial Life and Robotics 352 - 356 2023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：Proceedings of International Conference on Artificial Life and Robotics
The outbreak of the COVID-19 pandemic changed the model of the learning process. Online learning became one of the best solutions for many educational institutions, including the University, especially the Faculty of Computer Science, Brawijaya University. The continuance intention factor for using an online learning management system is important to ensure learning sustainability. To understand students' continuance intention this study proposes self determination model as a research model to find the factors affecting students' continuance intention toward online learning management systems. The proposed model is useful for investigating continuance intention factors. The study finds that intrinsic regulation, external regulation, identified regulation, and introjected regulation significantly positive impact on continuance intention in learning management systems. Finally, this study provides suggestions for the Faculty to improve the continuance intention of the student in using an online learning management system.
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Miyashita T., Katayama T., Kita Y., Yamaba H., Aburada K., Okazaki N.
Proceedings of International Conference on Artificial Life and Robotics 347 - 351 2023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：Proceedings of International Conference on Artificial Life and Robotics
TDD is a development methodology that brings us closer to better implementation and testing by repeating a series of steps: test design, implementation that satisfies the tests, and refactoring. This paper proposes a framework aimed at supporting the implementation steps in TDD. The proposed framework generates source code that passes tests while retaining refactoring by the developer. The prototyped framework reduced the time required for the implementation process by 94.22% and the generation time by 66.17% compared to manual work.
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Investigation of evacuation simulation from Tsunami considering road width in Aosima 査読あり
Keita Nabeyama, Shotaro Usuzaki, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Proc. 28th Int'l Sympo. on Artificial Life and Robotics 2023 (AROB 28th 2023) 953 - 958 2023年1月
担当区分：責任著者 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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On an improvement of hand gesture recognition for realizing a user authentication system using s-EMG 査読あり
Soichiro Ishibashi, Hisaaki Yamaba, Kentaro Aburada, Tetsuro Katayama, Naonobu Okazaki
Proc. 28th Int'l Sympo. on Artificial Life and Robotics 2023 (AROB 28th 2023) 968 - 972 2023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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A study of improving the safety of defense system based on whitelist 査読あり
Tsubasa Waki, Shotaro Usuzaki, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki
Proc. 28th Int'l Sympo. on Artificial Life and Robotics 2023 (AROB 28th 2023) 963 - 967 2023年1月
担当区分：責任著者 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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Investigation of PIN authentication schemes resistant to video-based recording attacks 査読あり
Ryo Masuzawa, Shotaro Usuzaki, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Mirang Park, Naonobu Okazaki
Proc. 28th Int'l Sympo. on Artificial Life and Robotics 2023 (AROB 28th 2023) 959 - 962 2023年1月
担当区分：責任著者 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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Proposal of Gamma Which Is a Messaging Platform for Spatial Data 査読あり
Ueda Takahiro, Katayama Tetsuro, Kita Yoshihiro, Yamaba Hisaaki, Aburada Kentaro, Okazaki Naonobu
Journal of Robotics, Networking and Artificial Life 9 ( 2 ) 136 - 142 2022年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：株式会社 ALife Robotics
This paper proposes Gamma, which is a messaging platform for spatial data. Gamma uses distributed MQTT system for spatial data sharing, and this paper aims to improve the usefulness of distributed MQTT system. In the experiment, it has been found that Gamma can process more messages than a single MQTT broker. It is confirmed that Gamma achieves scalability by increasing the number of Gateways and distributed MQTT brokers. Furthermore, it is confirmed that the efficiency of the distributed MQTT system can be improved by setting the responsibility area of Gateways.
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Proposal of a Method to Generate Classes and Instance Variable Definitions in VDM++ Specification by Using Machine Learning 査読あり
Suga Kensuke, Katayama Tetsuro, Kita Yoshihiro, Yamaba Hisaaki, Aburada Kentaro, Okazaki Naonobu
Journal of Advances in Artificial Life Robotics 2 ( 4 ) 189 - 194 2022年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：株式会社 ALife Robotics
Writing VDM++ specifications is difficult. The existing method can automatically generate only type and constant definitions in VDM++ specification from natural language specification by using machine learning. This paper proposes a method to generate classes and instance variable definitions in VDM++ specification from natural language specification to improve the usefulness of the existing method. From the evaluation experiment by using F- values, it has been confirmed that the proposed method can improve the usefulness of the existing method.
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Expansion of Application Scope and Addition of a Function for Operations into BWDM which is an Automatic Test Cases Generation Tool for VDM++ Specification 査読あり
Muto Takafumi, Katayama Tetsuro, Kita Yoshihiro, Yamaba Hisaaki, Aburada Kentaro, Okazaki Naonobu
Journal of Robotics, Networking and Artificial Life 9 ( 3 ) 255 - 262 2022年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：株式会社 ALife Robotics
The use of the formal specification description language VDM++ in software design can eliminate ambiguity in the specification. However, software testing after implementation is necessary even if the design uses VDM++, but manually generating test cases is labor-intensive and time-consuming. Therefore, our laboratory developed BWDM, which is an automatic test case generation tool for VDM++ specifications. However, BWDM is not very useful because it has three problems about its narrow scope of application. This paper solves the three problems and improves the usefulness of BWDM by expanding the scope of application of VDM++ definitions and adding a function to generate test cases for object states. In addition, we conducted a comparison experiment with manual test case generation and confirmed that BWDM can reduce work time.
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Detection of Blob and Feature Envy Smells in a Class Diagram using Class's Features 査読あり
Priyambadha Bayu, Katayama Tetsuro, Kita Yoshihiro, Yamaba Hisaaki, Aburada Kentaro, Okazaki Naonobu
Journal of Robotics, Networking and Artificial Life 9 ( 1 ) 43 - 48 2022年8月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：株式会社 ALife Robotics
Measuring the quality of software design artifacts is difficult due to the limitation of information in the design phase. The class diagram is one of the design artifacts produced during the design phase. The syntactic and semantic information in the class is essential to consider in the measurement process. Smell detection uses class-related information to detect the smell as an indicator of a lack of quality. Several classifiers use all information related to the class to prove how informative it for the smell detection process. The smell types that are a concern in this research are Blob and Feature Envy. The experiment using three classifiers (j48, Multi-Layer Perceptron, and Naïve Bayes) confirms that Blob smell detection utilizes the information successfully. On the other hand, Feature Envy still needs more elaboration. The average true positive rate by the classifiers is about 80.67%.