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- 저자 : Urakawa, S. (검색결과 20 건)
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HARMONIC MAPS AND BIHARMONIC MAPS ON PRINCIPAL BUNDLES AND WARPED PRODUCTS
Urakawa, Hajime Korean Mathematical Society 2018 대한수학회지 Vol.55 No.3
In this paper, we study harmonic maps and biharmonic maps on the principal G-bundle in Kobayashi and Nomizu and also the warped product $P=M{\times}_fF$ for a $C^{\infty}$(M) function f on M studied by Bishop and O'Neill, and Ejiri.
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Harmonic maps and biharmonic maps on principal bundles and warped products
Hajime Urakawa 대한수학회 2018 대한수학회지 Vol.55 No.3
In this paper, we study harmonic maps and biharmonic maps on the principal $G$-bundle in Kobayashi and Nomizu \cite{KN} and also the warped product $P=M\times_f F$ for a $C^{\infty}(M)$ function $f$ on $M$ studied by Bishop and O'Neill \cite{BO}, and Ejiri \cite{Ej}.
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우라카와 도쿠에(Tokue Urakawa) 나혜석학회 2012 나혜석연구 Vol.1 No.1
본고는 나혜석이 어떠한 사회를 지향하고 있었을까라는 관점으로 그녀의 사회의식을 고찰한 것이다. 신여성은 자아의 발견만을 강조하고 자유연애나 신정조론이 논의의 중심이었다는 평가도 뿌리 깊지만 초기의 나혜석의 담론에는 폭넓은 시점으로 현실 사회에 대한 과제를 직시한 것도 많이 있다. 그리고 개인적인 영역에 머물지 않고 ‘산업을 일으켜서 조선의 경제발전으로’라는 근대적인 합리적 사고를 바탕으로 한 지식인의 사유가 있었다. 나혜석은 개인의 정신적 풍요로움도 갈구했다. 그녀는 국가나 도덕에 규정되지 않는, 자발성을 기조로 한 ‘취미’의 정신이 발휘되는 생활을 지향하지만 그것은 같은 무렵의 요사노 아키코(?謝野晶子)의 주장 등에 연결되고 있었다. 이혼 후에는 자기 자신의 내면을 토로한 글쓰기가 많아졌고 ‘파리’ 와 ‘조선’을 둘러싼 갈등이나 균열도 솔직히 말하고 있다. 나혜석의 글쓰기는 젊었을 때의 이상이 현실 속에서 어떻게 어긋나가는지를, 그리고 어떻게 저항해가는지를 보이는 귀중한 시대의 증언이다. This paper explores Rha Hyeseok’s social consciousness from the perspective of the type of society she sought. In general, many strongly support the idea that “New Women” emphasizes only the ‘discovery of self’ and that it mainly discusses free love and the new chastity theory. However, many of her early writings also focused on the condition of society at the time. Underlying her early work was the hope for Korea’s economic development through industrialization, derived from her deep intellectual thought which was characterized by modern rational thinking. Furthermore, she had a strong desire for individual psychological enrichment. She strived for the type of life not governed by a nation or morals which allows each individual to pursue his or her interests autonomously. This coincided with the tone of arguments expressed by Akiko Yosano, a writer of the same era. After the divorce, her writings increasingly focused on the inner world, and she candidly expressed her inner conflicts and split between ‘Paris’ and ‘Korea.’ Her writings are a valuable testimony to the era she lived in as they convey the shift in her early ideals as well as her struggles against it in the face of reality.
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Component dynamics in miscible polymer blends: A review of recent findings
Watanabe, Hiroshi,Urakawa, Osamu The Korean Society of Rheology 2009 Korea-Australia rheology journal Vol.21 No.4
Miscible polymer blends still have heterogeneity in their component chain concentration in the segmental length scale because of the chain connectivity (that results in the self-concentration of the segments of respective chains) as well as the dynamic fluctuation over various length scales. As a result, the blend components feel different dynamic environments to exhibit different temperature dependence in their segmental relaxation rates. This type of dynamic heterogeneity often results in a broad glass transition (sometimes seen as two separate transitions), a broad distribution of the local (segmental) relaxation modes, and the thermo-rheological complexity of this distribution. Furthermore, the dynamic heterogeneity also affects the global dynamics in the miscible blends if the component chains therein have a large dynamic asymmetry. Thus, the superficially simple miscible blends exhibit interesting dynamic behavior. This article gives a brief summary of the features of the segmental and global dynamics in those blends.
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Omura, Yasuhisa,Iida, Yukio,Urakawa, Fumio,Ogawa, Yoshifumi The Institute of Electronics and Information Engin 2007 Journal of semiconductor technology and science Vol.7 No.2
We propose and experimentally demonstrate a ring resonator with sharp U-turns fabricated on a silicon-on-insulator (SOI) substrate; the resonator was designed as a key part of an optical, dynamic data storage device. We discuss the optical properties of the fabricated ring resonator from the viewpoint of equi-frequency-contour behavior in a dispersion space. We successfully characterize its optical characteristics on the basis of photonic crystal physics. It is suggested that the photonic ring resonator will be applicable to optical, dynamic memory devices for optical communication systems.
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