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Solvent and Structural Fluctuations Induced Symmetry-Breaking Charge Transfer in a Porphyrin Triad
Kim, Taeyeon,Kim, Woojae,Mori, Hirotaka,Osuka, Atsuhiro,Kim, Dongho American Chemical Society 2018 The Journal of Physical Chemistry Part C Vol.122 No.34
<P>This study aims to show that the symmetry-breaking charge transfer (SBCT) in a donor-acceptor-donor (DAD) porphyrin triad occurs via solvent and structural fluctuations measured by using femtosecond broadband fluorescence upconversion spectroscopy, which can directly trace the origin of the emitting state by monitoring its emission dipole moment as a function of time. While the emission dipole moment of the triad in the excited state remains nearly unchanged in nonpolar solvents such as cyclohexane and toluene, it is significantly reduced in polar solvents such as benzonitrile due to a change in the emitting state from quadrupolar (the exciton coupled state) to dipolar symmetry (the relaxed S<SUB>1</SUB> state). The latter state is formed by the SBCT process of DAD via a combination of solvent and structural fluctuations.</P> [FIG OMISSION]</BR>
김태연(Kim. Taeyeon),김창남(Kim. Chang-Nam),홍구표(Hong. Gu-Pyo),김광호(Kim. Kwang-Ho),노지웅(Rho. Ji-Woong),김병선(Kim. Byung-Seon) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The Purpose of this study was to analyze the smoke elimination performance and evacuation time in an arcade of traditional market. In this study, the effect of the opening for the ventilation about the smoke eliminating performance was analyzed using CFD (Computational Fluid Dynamics) method. And also the evacuation time was analyzed according to the height of the building. The opening of the arcade is very important design factor to control the smoke movement.
Hyun Jung Kim(Hyun Jung Kim),Taeyeon Hwang(Taeyeon Hwang) 한국영어평가학회 2022 영어평가 Vol.17 No.2
Washback has been of interest in the field of second and foreign language teaching as well as testing; indeed, it has been widely discussed as one of the key test qualities. While multifaceted aspects of washback have been proposed and examined, there still remain many more unanswered questions because washback should be evaluated in relation to a specific testing and teaching/learning situation. It is therefore worth reviewing prior research and identifying gaps in the literature to address future research on washback, especially in the Korean context. This article first reviews seminal theoretical contributions to the current understanding of washback. It then introduces prior empirical research on two test types: largescale testing and classroom/school-based assessments used in both international and Korean contexts. Whereas the washback effects of representative international large-scale tests have been widely examined worldwide, there have been a limited number of studies on washback involving large-scale and classroom assessments in the Korean context. The primary focus of prior research has been on the perceptions of teachers and learners, while empirical evidence in teaching and learning is still lacking. These comprehensive, critical reviews illustrate washback effects on a range of stakeholders at different stages of teaching and learning, which contribute to addressing the need for future research on washback.
Kim Taeyeon,Lee Youngjun 서울대학교 교육연구소 2020 Asia Pacific Education Review Vol.21 No.2
We investigated the relationship between principal instructional leadership and teacher participation in multiple types of professional development in Japan, Singapore, and South Korea. Using the Teaching and Learning International Survey dataset of 2013, we employed two-level logistic regression models to estimate the rigorous efects of principal instructional leadership that were separated out from teacher-level efects. We found that the infuence of principal instructional leadership on teachers’ participation in professional development varied across types of learning activities and countries. Our analysis suggests that principal instructional leadership can infuence teachers’ participation in mentoring, mentoring, peer observation, and coaching compared to the other types of professional development. Our study builds on and extends research on cross-national characteristics of teacher learning by adding evidence about the relations between principal leadership and teacher professional development in the three Asian countries.
Taeyeon Tenny Kim 한국교육행정학회 2017 Journal of Educational Administration and Policy Vol.2 No.-
Due to the expansion of globalization and the decrease of students in the school age population, it is important for Korean universities to recruit international students. The number of international degree-seeking students in Korea has increased tremendously over the past two decades due to campaigns such as the ‘Study in Korea 2020’ and individual universities’ promotional activities. However, the quality of these international students’ academic achievements has not been explored thus far, nor has there been analysis of the methods focused on recruiting academically high achieving students. In this study, I explore the characteristics of academically talented Chinese students (ATCS) and how to best recruit them. Chinese students make up the highest proportion of international degree-seeking students in Korea. According to interviewed ATCS, several factors influenced their decision-making processes when they selected their study destination and as they adapted to an unfamiliar environment. When selecting a study destination, emotional reasons had higher influence than rational reasons. Expectations for academic achievement, desire to be different from others, and personal preference were key reasons for selecting a study destination, which contrasted from those reported by Chinese students in previous research. During their adaptation process, academic adaptation occurred prior to social or cultural adaptation. ATCS considered academic achievements more important than making friends. Their academic achievements naturally led to social acceptance by Koreans as they earned their respect. All the interviewees emphasized the importance of their relationships with their academic advisors, which helped them adapt to Korea and their study environment. Lastly, students who spoke Korean adapted faster and easier.