著者

Atsuo Maki Yuu Miino Naoya Umeda Masahiro Sakai Tetsushi Ueta Hiroshi Kawakami

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

Nonlinear Theory and Its Applications, IEICE (ISSN:21854106)

巻号頁・発行日

vol.13, no.1, pp.2-24, 2022 (Released:2022-01-01)

参考文献数

53

被引用文献数

2

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Capsizing is one of the worst scenarios in oceangoing vessels. It could lead to a high number of fatalities. A considerable number of studies have been conducted until the 1980s, and one of the discoveries is the weather criterion established by the International Maritime Organization (IMO). In the past, one of the biggest difficulties in revealing the behavior of ship-roll motion was the nonlinearity of the governing equation. On the other hand, after the mid-1980s, the complexity of the capsizing problem was uncovered with the aid of computers. In this study, we present the theoretical backgrounds of the capsizing problem from the viewpoint of nonlinear dynamics. Then, we discuss the theoretical conditions and mechanisms of the bifurcations of periodic solutions and numerical attempts for the bifurcations and capsizing.

著者

Akito Tsuchiya Aki Nishihara Ayumi Saeki Yuki Teru Takashi Aoki Tomoya Kono Masahiro Sakai Jun-ichi Hikima

出版者

The Japanese Society of Fish Pathology

雑誌

魚病研究 (ISSN:0388788X)

巻号頁・発行日

vol.55, no.1, pp.18-21, 2020-03-15 (Released:2020-04-02)

参考文献数

25

被引用文献数

1

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Pseudotuberculosis pathogen, Photobacterium damselae subsp. piscicida (Pdp) shows some differences in virulence between Japanese and US strains. ​In this study, we analyzed plasmid DNAs derived from Japanese and US strains of Pdp, and found two homologous regions in these plasmids, pOT-51443-4/p91-197-1 and pOT-51443-1/p91-197-2. ​All genes in the p91-197-1 from US strain were observed in the pOT-51443-4 from Japanese strain. ​This event might have occurred during transmission of the US plasmid to Japanese strain. ​Inhibitor of vertebrate lysozyme (ivy), a known pathogenicity factor was encoded in the homologous region of pOT-51443-1/p91-197-2. ​Thus, the genomic region containing ivy may have been horizontally transmitted between the two Pdp strains.