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Consensus Control of Multi-agent Systems Over Undirected Graphs with Quantized Signal Communication
Takumi Furusaka,Takao Sato,Nozomu Araki,Yasuo Konishi 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
This study proposes a new design method for the consensus control of multi-agent systems with quantized signal communication. When the static quantizer used, the performance of the consensus control is deteriorated depending on the quantizing level. In a conventional method, the quantization is implemented the probability function. On the other hand, in the proposed method, the dynamic quantizer is introduced, and it is optimally designed. As a result, the consensus control performance is improved. Finally, the effectiveness of the proposed method is demonstrated through numerical examples.
A Study on Transmission Replacement Plan Considering Multiple Supply Networks
Yasumura, Takumi,Tsuji, Takao,Oyama, Tsutomu,Hidaka, Kazuhiro,Koda, Jun,Seki, Tomomichi 대한전기학회 2012 The Journal of International Council on Electrical Vol.2 No.2
In recent years, Japanese electric power supply network equipments are almost at the end of their lifetime. It is an urgent necessity to manage their replacements[1]-[2]. In this paper, replacement planning approach for electric power supply network is studied based on the actual network model. The EENS (Expected Energy Not Supplied) is used as an index for reliability of supply network. The aging effect of equipments is also treated. It is assumed that the retransmission failure probability of single circuit fault is increased due to the aging of the equipments. In our previous papers, single supply network connected to one substation is examined[3]-[4]. On the contrary, multiple supply networks connected to different substations are examined in this paper. If the EENS of individual supply network is used for evaluation, the replacement plan may become too severe. However, evaluating the total EENS in multiple supply networks, the replacement plan becomes flexible.
Yuji Takao,Takumi Atarashi,Takashi Kubo,Masaki Nagae,Tomoki Nakayama 한국대기환경학회 2019 Asian Journal of Atmospheric Environment (AJAE) Vol.13 No.4
Ambient aerosol particles at forest and suburban sites in western Japan were analyzed for imidazole compounds, such as 4 (5)-Methylimidazole (4-MI), 1-ethylimidazole (1-EI), 2-ethylimidazole (2-EI), and imidazole-2-carboxaldehyde (IC). The aerosols were collected on quartz fiber filters and extracted by the solid phase extraction method. The extract was analyzed by HPLC/Q-TOF-MS using an ion-pairing agent. The concentration of 4-MI in winter was higher than those in summer at the forest site; its concentration was highest among the analyzed imidazoles. The concentration of 4-MI in the suburban site was several times higher than the forest site. Anthropogenic activities, such as vehicle emissions, are considered to be the major source of 4-MI in this region.
Matsuura Takumi,Yamamoto Tetsuya,Matsumoto Yoshiyuki,Itino Takao 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4
We reconstructed Stomaphis phylogeny and analyzed evolutionary host-plant shifts. The molecular phylogeny revealed 23 well-supported lineages, each specialized to use specific host plant family, whilst host plants of Stomaphis aphids ranged across 6 orders, 11 families, 21 genera, and 28 species. This combination of high host specificity with evolutionarily distant host shifts is exceptional in herbivores. To explain this pattern, we propose one hypothesis among several possibilities: Stomaphis aphids are generalists with respect to the defensive chemicals produced by the plant, but specialists with respect to the stem surface structure of the host tree. This hypothesis predicts that tree taxa having stem surface structures preferred by Stomaphis would be used again and again by genetically distinct Stomaphis lineages. Consistent with this prediction, we found that different (occa sionally phylogenetically distant) Stomaphis lineages shared the same host plant genera such as Alnus and Betula. This result suggests that, in the course of their evolutionary history, Japanese Stomaphis aphids have repeatedly colonized a limited number of host plant genera.
Sintering and Mechanical Properties of Chromium Boride-chromium Carbide Composites
Matsushita Jun-Ichi,Shimao Kenji,Machida Yoshiyuki,Takao Takumi,Iizumi Kiyokata,Sawada Yutaka,Shim Kwang-Bo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Several boride sintered bodies such as , , and were previously reported. In the present study, the sinterability and physical properties of chromium boride containing chromium carbide sintered bodies were investigated in order to determine its new advanced material. The samples were sintered at desired temperature for 1 hour in vacuum under a pressure by hot pressing. The relative density of sintered bodies was measured by Archimedes' method. The relative densities of addition of 0, 5, 10, 15 and 20 mass% composites were 92 to 95%. The Vickers hardness of the with 10 and 15 mass% composites were about 14 and 15 GPa at room temperature, respectively. The Vickers hardness at high temperature of the addition of 10 mass% composite decreased with increasing measurement temperature. The Vickers hardness at 1273 K of the sample was 6 GPa. The Vickers hardness of addition of composites was higher than monolithic sintered body. The powder X-ray diffraction analysis detected CrB and phases in containing composites.