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Hamamoto, M.,Kim, J.A.,Kwon, S.H.,Lee, S. K.,Jo, H.J. The Society of Naval Architects of Korea 1995 Journal of hydrospace technology Vol.1 No.1
For the mechanism of ship capsizing, we can generally consider that it\`s caused due to pure loss of stability, parametric oscillation(low cycle resonance) of ship in waves and the broaching phenomena. Among them, low cycle resonance occurs due to the dynamic change of righting arm with respect to the relative position of ship to waves. The dynamic change depends on the encounter period of a ship in following waves. This paper discusses the following items : (1) An analytical expression of GZ curve varying with respect to the relative position of ship to waves, (2) Non-linear equation of motion describing low cycle resonance, (3) The effects of righting arm, stability range and encounter period on low cycle resonance.
Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
Hamamoto, Keita,Ezawa, Motohiko,Kim, Kun Woo,Morimoto, Takahiro,Nagaosa, Naoto American Physical Society 2017 Physical Review B Vol.95 No.22
<P>Spin current plays a central role in spintronics. In particular, finding more efficientways to generate spin current has been an important issue and has been studied actively. For example, representative methods of spin-current generation include spin-polarized current injections from ferromagnetic metals, the spin Hall effect, and the spin battery. Here, we theoretically propose a mechanism of spin-current generation based on nonlinear phenomena. By using Boltzmann transport theory, we showthat a simple application of the electric field E induces spin current proportional to E-2 in noncentrosymmetric spin-orbit coupled systems. We demonstrate that the nonlinear spin current of the proposed mechanism is supported in the surface state of three-dimensional topological insulators and two-dimensional semiconductors with the Rashba and/or Dresselhaus interaction. In the latter case, the angular dependence of the nonlinear spin current can be manipulated by the direction of the electric field and by the ratio of the Rashba and Dresselhaus interactions. We find that the magnitude of the spin current largely exceeds those in the previous methods for a reasonable magnitude of the electric field. Furthermore, we show that application of ac electric fields (e.g., terahertz light) leads to the rectifying effect of the spin current, where dc spin current is generated. These findings will pave a route to manipulate the spin current in noncentrosymmetric crystals.</P>
Hamamoto,M.,Kim,J.A.,Kwon,S.H.,Lee,S.K.,Jo,H.J. 韓國海洋大學校 附設 海洋科學技術硏究所 1997 硏究論文集 Vol.6 No.-
For the mechanism of ship capsizing, we can generally consider that it's caused due to pure loss of stability, parametric oscillation(low cycle resonance) of ship in waves and the broaching phenomena. Among them, low cycle resonance occurs due to the dynamic change of righting arm with respect to the relative position of ship to waves. The dynamic change depends on the encounter period of a ship in following waves. This paper discusses the following items: (1) An analytical expression of GZ curve varying with respect to the relative position of ship to waves, (2) Non-linear equation of motion describing low cycle resonance, (3) The effects of righting arm, stability range and encounter period on low cycle resonance.
Kurokawa, Kenji,Hamamoto, Hiroshi,Matsuo, Miki,Nishida, Satoshi,Yamane, Noriko,Lee, Bok Luel,Murakami, Kazuhisa,Maki, Hideki,Sekimizu, Kazuhisa American Society for Microbiology 2009 Antimicrobial Agents and Chemotherapy Vol.53 No.9
<B>ABSTRACT</B><P>The availability of a silkworm larva infection model to evaluate the therapeutic effectiveness of antibiotics was examined. The 50% effective doses (ED50) of d-cycloserine against the <I>Staphylococcus aureus ddlA</I> mutant-mediated killing of larvae were remarkably lower than those against the parental strain-mediated killing of larvae. Changes in MICs and ED50 of other antibiotics were negligible, suggesting that these alterations are d-cycloserine selective. Therefore, this model is useful for selecting desired compounds based on their therapeutic effectiveness during antibiotic development.</P>