http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Role of Students' Affective Factors in Assessing Their Non-native Teachers of English
Jaewoo Shim,Keiko Samimy,Kyoungjin Han 현대문법학회 2012 현대문법연구 Vol.69 No.-
A role of students' affective factors in assessing their non-native teachers of English. Studies in Modern Grammar This study investigated the relationship between non-native English as a Foreign Language (EFL) students’ perceptions of their non-native teachers and their own affective variables. A total of 189 subjects in this study responded to a Likert-type scale instrument that measured their self-directed learning behavior, anxiety, class participation, their perceived teachers’ teaching ability, closeness with their teachers, and anxiety aroused in the presence of their teachers. Following principal factor analyses to check the construct validity of each construct, canonical correlation analysis was performed to understand to what extent subjects’ perceptions of their non-native teachers of English can be related to their affective states are related. The results indicated that the two sets were moderately correlated in two functions with canonical coefficients 0.52 and 0.37, suggesting that perceptions of non-native teachers may be related to learners’ affective states. Further analyses showed that students who reported high on self-regulatory learning behavior and classroom participation were likely to feel that their teacher was close to them, were still likely to feel anxious, and tended to feel positive about their teacher’s teaching ability. In addition, this study found that students with low foreign language anxiety were likely to manifest low belief in their teacher’s teaching ability, were likely to feel distant from their teacher, and likely to have the fear of negative evaluation.
Jaewoo YIM,Sung Won CHO,Beomhee KIM,Sungwoo PARK,Yong Hee HAN,Sang Woo SEO 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Long-term space missions affect the gut microbiome of astronauts, especially the viability of some pathogens. Probiotics may be an effective solution for the management of gut microbiomes, but there is a lack of studies regarding the physiology of probiotics in microgravity (MG). Here, we investigated the effects of MG on the probiotic Escherichia coli Nissle 1917 (EcN) by comparing transcriptomic data during exponential and stationary growth phases under simulated MG and normal gravity. MG affected several physiological features of EcN, including its growth profile, biofilm formation, stress responses, metal ion transport/utilization, and response to carbon starvation. We found that some changes, such as decreased adhesion ability and acid resistance, may be disadvantageous to EcN relative to gut pathogens under MG, indicating the need to develop probiotics optimized for space flight. Thus, we are now investigating the differentiation of gene expression and growth profile of EcN when co-cultured with pathogenic Pseudomonas aeruginosa PAO1 under MG as follow-up study. For exact simulation of gut microbiome of astronauts, co-cultured samples are cultivated at anaerobic condition.
Strategically Designed Zeolitic Imidazolate Frameworks for Controlling the Degree of Graphitization
Han, Sang A,Lee, Jaewoo,Shim, Kyubin,Lin, Jianjian,Shahabuddin, Mohammed,Lee, Jong-Won,Kim, Sang-Woo,Park, Min-Sik,Kim, Jung Ho The Chemical Society of Japan 2018 Bulletin of the Chemical Society of Japan Vol.91 No.10
Piezo/triboelectric nanogenerators based on 2-dimensional layered structure materials
Han, Sang A,Lee, Jaewoo,Lin, Jianjian,Kim, Sang-Woo,Kim, Jung Ho Elsevier 2019 Nano energy Vol.57 No.-
<P><B>Abstract</B></P> <P>Recently, research on energy harvesting has attracted great attention as a solution to energy depletion and environmental problems due to the use of fossil fuels such as coal, natural gas, and oil. To be precise, harvesting technology converts the energy sources around us such as solar, heat, and mechanical energy into electrical energy. It has the advantage of being able to supply and sustain energy on a permanent basis, rather than being non-renewable, and it is also eco-friendly. Among the various energy harvesting techniques, nanogenerators based on piezoelectric and triboelectric phenomena can generate electrical energy based on mechanical energy sources, which are usually ubiquitous, there are no restrictions due to weather, time, or space, and this technology is also user-friendly. Recently, two-dimensional (2D) materials have been chosen for implementing piezo/triboelectric nanogenerators. The 2D materials have transparency, flexibility, and a high surface-to-volume ratio. Owing to the very low thickness of the atomic unit, a stacking structure using 2D materials can be also made to form a very thin device, which is applicable for insertion into the body or wearable electronic devices. In this review, we summarize the characteristics and research results on piezo/triboelectric energy harvesters based on 2D layered structure materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The characteristics of 2D materials are transparency, flexibility, and high surface-to-volume ratio. </LI> <LI> With these advantages, 2D materials with piezo/triboelectric potential can be applied as various electronic devices. </LI> <LI> We summarize the research results on piezo/triboelectric energy harvester based on 2D layered structure materials. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>