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환경과 어학능력점수에 따른 한국 성인 학습자들의 영어불안감 양상
고지은(Jieun Ko),최윤덕(YunDeok Choi),이혜문(Haemoon Lee) 한국응용언어학회 2020 응용 언어학 Vol.36 No.4
This paper presents the unique patterns of anxiety observed in adult Korean English as a Foreign Language (EFL) learners. Through the survey consisting of 40 questions, 135 participants’ anxiety about EFL was examined in relation to the English-using environment -both inside and outside of the classroom-and TOEIC scores. The statistical analysis showed that there was no significant difference in anxiety depending on the English using environment. However, unlike previous research, participants with higher test scores tended to show higher levels of anxiety than those with lower test scores, and the effect of the test scores on anxiety was significant. In addition, there was no significant interaction effect between the English using environment and the test scores on anxiety. The concluding discussions include that the Korean learners’ goal for high proficiency test scores led to their conscious processing of their declarative knowledge or self-monitoring in all types of English environments, which in turn led to high levels of anxiety as their explicit and conscious knowledge increased up to the proficiency test score level expected by society.
전아영,고지은,김종영,Jeon, A Young,Ko, Jieun,Kim, Jong-Young 한국결정성장학회 2013 韓國結晶成長學會誌 Vol.23 No.1
본 연구팀에서는 층상형 페로브스카이트 구조를 갖는 Ruddlesden-Popper 구조의 $K_2La_2Ti_3O_{10}$의 박리화를 통해 Aurivillius 구조의 $Bi_{4-x}La_xTi_3O_{12}$(x~2) 페로브스카이트 산화물을 성공적으로 합성하였다. 박리화된 란타늄 티타네이트 나노시트는 BiOCl 나노결정구조와 반응시켜 $Bi_{4-x}La_xTi_3O_{12}$(x~2) 결정을 얻어내었다. 박리화된 나노시트 현탁액은 $K_2La_2Ti_3O_{10}$으로부터 수소화된 $H_2La_2Ti_3O_{10}$의 층간에 에틸아민을 삽입시킴으로써 얻어내었다. 투과전자현미경(TEM) 분석을 통해, 란타늄 티타네이트가 에틸아민에 의해 박리화된 것을 확인할 수 있었다. X-선 회절분석(XRD)을 통해, 박리화된 란타늄 티타네이트와 BiOCl의 재적층과정을 거쳐 $700^{\circ}C$ 이상의 열처리 조건에서 $Bi_{4-x}La_xTi_3O_{12}$(x~2)로 형성된 것을 확인할 수 있었다. We have successfully synthesized $Bi_{4-x}La_xTi_3O_{12}$ (x~2) having Aurivillius-type layered perovskite structure from exfoliated layered perovskite oxide of $K_2La_2Ti_3O_{10}$ with Ruddlesden-Popper structure. The reaction between the exfoliated lanthanum titanate nanosheets and BiOCl nanocrystal resulted in the formation of polycrystalline $Bi_{4-x}La_xTi_3O_{12}$ (x~2) after heating above $700^{\circ}C$. Colloidal suspension of the nanosheets could be obtained by intercalating ethylamine (EA) into the protonated lanthanum titanate, $H_2La_2Ti_3O_{10}$, derived from $K_2La_2Ti_3O_{10}$. Transmission electron microscopic (TEM) analysis show that the exfoliated lanthanium titanate nanosheets have a thickness of a few nano meters. According to X-ray diffraction (XRD) analysis, the exfoliated lanthanium titanate was found to be transformed into $Bi_{4-x}La_xTi_3O_{12}$ (x~2) after restacking with BiOCl and subsequent thermal treatment at > $700^{\circ}C$.
서상우(Sangwoo Seo),김승현(Seunghyeon Kim),고지은(Jieun Ko),김창익(Changick Kim) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.11
Domain generalization aims to generalize a model to a previously unseen domain. Generalizing the model by narrowing the gap between the domains of training data and test data is an essential task for applying the neural network model to reality. In this paper, we adopt meta-dropout technique to domain generalization settings that can perturb the training examples. We parameterize and train noise so that general decision boundaries can be more accurately predicted. Experimental results on the PACS dataset have shown that the proposed method yields superior performance than existing methods.