Yoshihiro Narita

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We successfully developed an arbitrary micro-patterning method with femtosecond pulses using a multi-level phase type diffractive optical element (DOE) and a focusing objective lens. The large chromatic dispersion effects of DOE resulting from the spectral bandwidth of femtosecond pulses can be reduced with the appropriate DOE focal length and the proper(More)
A multi-objective optimization approach for fibrous composite plates with curvilinear fibers is proposed in the present study. The non-dominated sorting genetic algorithm (NSGA-II) is used to obtain Pareto-optimum solutions, where the presence of a trade-off relation between the mechanical performance and curvatures of reinforcing fibers has been(More)
We investigated a microfabrication process for optical gratings with periods of micrometer order that use ultrafast laser pulses in semiconductor-doped glass. ZnS- or PbS-doped SiO2-A12O3-B2O3-CaO-ZnO-Na2O-K2O glass was prepared by a melting method. Glass transmission diffraction gratings with a high refractive-index difference were fabricated with(More)
A microfabrication process using ultrafast laser pulses in glass was investigated. We investigated the formation of semiconductors by the irradiation of glasses with femtosecond laser pulses. ZnS- or PbS-doped SiO(2)-Al2O(3)-B(2)O(3)-CaO-ZnO-Na(2)O-K(2)O glasses were prepared by a melting method and irradiated by femtosecond laser pulses. Periodic(More)
An adaptive control method using a self-organizing map (SOM) which is a kind of neural networks is proposed to suppress vibration of smart structures. The SOM learns characteristics of given data without supervising and categorizes high dimensional data into low dimensional maps with keeping complex relationships among data. The present method employs the(More)
The authors researched individual psychotherapy of borderline personality disorder (BPD) in Japan using a questionnaire given to expert therapists. To select the expert therapists, a database search for the keywords "borderline personality disorder" and "border-line case" was carried out in the Japanese literature on psychiatry and clinical psychology.(More)