| 廣瀨 慈恩 | M, 2回目発表 | ディペンダブルシステム学 | 井上 美智子, | 笠原 正治, | 大下 福仁, | 新谷 道広 |
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title: Gathering for mobile agents with a strong team in weakly Byzantine environments
abstract: We study the gathering problem requiring a team of mobile agents to gather at a single node in arbitrary networks. The gathering is a fundamental task in the field of distributed systems and is studied on a variety of models. We focus on a model such that the team includes Byzantine agents, which behave arbitrarily. The algorithms for the model are important because they tolerate any fault of agents.In literature, a gathering algorithm with any number of Byzantine agents is proposed. In this study, we ask the question of whether we can reduce the time required to gather the team if we have a strong team, i.e., a team with a few Byzantine agents, because not so many agents are subject to faults in practice. We give a positive answer to this question by proposing two algorithms with different ways of terminating. Both algorithms significantly reduce the time compared to the existing one under certain conditions. language of the presentation: Japanese | ||||||
| 岩田 和弘 | M, 2回目発表 | ネットワークシステム学 | 岡田 実, | 笠原 正治, | 東野 武史, | DUONG QUANG THANG |
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title: An investigation on wide band near-field communications
abstract: Recently, wireless communication methods with submersibles (manned or unmanned) are attracting great attentions. Acoustic communications are currently employed for many applications. However, this method is limited in the transmission rate, and simultaneous transmissions and reception with this method is impossible. Meanwhile, the wireless communications using radio waves suffer from severe attenuations when carried out under the seawater. To avoid this severe attenuation in the radio propagation, near-field communications (NFC) which is based on the magnetic induction has been proposed. However, NFC has a problem that a wide band cannot be secured. So, it is not possible to use OFDM. Therefore, we aim to secure a broadband NFC communication path by using a magnetic resonator. language of the presentation: Japanese 発表題目: 磁気誘導を用いた近傍界通信の広帯域化に関する研究 発表概要: 近年、海中を航行する有人潜水船や無索無人探査機（母船とケーブルで接続されていない探査機）との無線通信の手法が広く研究されている。現在は、音響通信が利用されているが、これは伝送速度が遅く同時送受信が困難である。また、電磁波を用いた通信は、海水中での伝搬損失が大きいため、通信が困難である。そこで、環境要因による影響が少ない磁気誘導を用いた通信が提案されている。しかし、磁気誘導を用いた通信では、広い帯域が確保できず、OFDMなどの周波数利用効率の高い変調方式が利用できないという問題点がある。本研究では、磁気共振器を用いることで、OFDMを用いることのできるような、広帯域な磁気誘導通信路の確保を目指す。 | ||||||
| 小林 恒輝 | M, 2回目発表 | 知能システム制御 | 杉本 謙二, | 笠原 正治, | 小蔵 正輝（客員准教授） | |
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title: Deep unfolding-based stabilization of continuous-time systems
abstract: In this research, we propose a deep unfolding-based design method of stabilization controller for continuous-time systems. It is important to stabilize the systems in control theory. There are many methods to design a stabilization controller. However, those methods apply only to a specific system. Therefore, when the target system changes, the designer needs to use a different design method suitable for the system. Furthermore, in some cases, conventional methods may not be able to stabilize the system. We propose a data-driven approach to design a controller gain by using a deep-learning technique called Neural Ordinary Differential Equations. We design an anti-windup controller using the proposed method and compare it with a conventional one based on linear matrix inequalities (LMIs). We observe that the proposed method outperforms the existing methodology, thereby confirming the effectiveness of the proposed method. language of the presentation: Japanese | ||||||