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- 저자 : Yashiki, K. (검색결과 4 건)
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方向性を表す補助動詞の日韓対照研究から見る学習者の問題点 -「~てくる」「~てくれる」と「-어 오다」「-어 주다」を対象として-
屋敷陽子(Yashiki Yoko) 대한일어일문학회 2020 일어일문학 Vol.88 No.-
It is often thought that the reason for Japanese learners" misuse according to the omission of 「-te kuru」and 「-te kureru」is not the matter of benefit, but the directionality of verbs. In this context, this study analyzes the semantic function of “-te kuru”/“-te kureru” and “-eo oda”/“-eo juda” from the viewpoint of verbal directionality. A survey was conducted targeting native Japanese speakers, native Korean speakers, and Korean learners of Japanese, in order to clarify similarities and differences between the two languages. In the analysis, the Japanese verbs are classified into 6 types - subject movement verbs 1, 2, and 3, and object movement verbs 1, 2, and 3 - according to the type of movement, and the necessity of 「-te kuru」and 「-te kureru」is verified. In addition, similarities and differences in comparison with the Korean equivalents “-eo oda” and “-eo juda” are also explored. The result of the survey conducted under the comparative study shows that the Japanese language has a high frequency of 「-te kuru」or 「-te kureru」, except in subject movement verb 3, and it is necessary to use these expressions. The result is as expected. In the case of the Korean language, the expressions in question tend to be used alone, except in subject movement verb 1. In general, no common tendency was found. In the Korean language, it is considered that the necessity of “-eo oda” and “-eo juda” differs depending on words, and those verbs alone do not indicate directionality. The answers from the Korean learners shows that subject movement verbs 1 and 2, and object movement verb 3 are frequently misused. The preference Korean learners between these expressions, as well as the strong tendency Korean native speaker shows in their choice of expressions, suggests influence from their mother language.
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Free Spectral Range Measurement of Fabry-Perot Cavity using Frequency Modulation
Masato Aketagawa,Takuya Yashiki,Shohei Kimura,Tuan Quoc Banh 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.
In this paper, we propose a novel method to measure the free spectral range (FSR) of a Fabry-Perot cavity (FPC)using single-frequency modulation (FM) with one electric optical modulator (EOM) and the null method. A laser beam modulated by the EOM, to which a cosine-wave signal is supplied from a radio frequency (RF) oscillator, is incident on the FPC. The transmission light from the FPC is observed and converted to an RF signal by a highspeed photodetector, and the RF signal is synchronously demodulated with a lock-in amplifier (LIA) by referring to the oscillator. We theoretically and experimentally demonstrate that the LIA signal become null with a steep slope, when the modulation frequency equals the FSR under the condition that the carrier frequency is slightly detuned from the resonance of the FPC. The experimental results show that the proposed method has the capability to determine the FSR by the null method with a small measurement uncertainty.
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In-situ Observation of Hydride Stability of Vanadium Alloys in Electron Microscope
Ohnuki, S.,Takase, K.,Yashiki, K.,Hamada, K.,Suda, T.,Watanabe, S. Korean Society of Electron Microscopy 2006 Applied microscopy Vol.36 No.2
High-resolution microscopy was applied for surveying hydride stability in Vanadium alloys, which are candidate for hydrogen storage materials of advanced hydrogen energy systems. $V_2H$ hydride in V alloys was stable at room temperature under the vacuum condition, but it was decomposed during heating up to $100^{\circ}C$. It was confirmed from HRTEM image and FFT that $V_2H$ has a BCT structure, where hydrogen atoms locate at octahedral sites. Crystal orientation was <110> beta// <110> mat., and lattice strain is about 10%. After the decomposition of the hydride, relatively large lattice expansion was observed in the matrix, which suggests that hydrogen atoms should be trapped by lattice defects and included in the matrix. Intensive electron beam also enhanced the decomposition.
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