Entity

Time filter

Source Type


Lee S.,Korea Institute for Curriculum and Evaluation | Kang E.,Seoul National University | Kim H.-B.,Seoul National University
Journal of Science Education and Technology | Year: 2015

This study aimed to explore the effect on group dynamics of statements associated with deep learning approaches (DLA) and their contribution to cognitive collaboration and model development during group modeling of blood circulation. A group was selected for an in-depth analysis of collaborative group modeling. This group constructed a model in a similar fashion to a target model and demonstrated within-group dialogic interaction patterns. It was found that statements associated with DLA contributed to the collaborative group dynamics by providing cognitive scaffolding and enabling critical monitoring, which together facilitated model development and students’ participation and understanding. In the model generation phase, the skills demonstrated indicated the use of statements associated with DLA as one student focused on the principles of blood circulation, thereby providing scaffolding for the other students. These students then generated another sub-model. In the model elaboration phase, statements associated with DLA elements such as request information of mechanism (AQ-a) and resolve discrepancies in knowledge (AQ-b) provided students with metacognitive scaffolding and enabled them to show their deep cognitive participation. Moreover, statements associated with DLA elements such as asking questions or metacognitive activity enabled the students to monitor others’ models or ideas critically, showing that active cognitive interaction was taking place within the group. These findings reveal that individual learning approaches will bring a synergistic effect to a group modeling process and can lead to practical educational insights for educators seeking to use lessons based on group modeling. © 2014, The Author(s). Source


Kim C.Y.,Dongguk University | Kang H.J.,Dongguk University | Chung S.J.,Dongguk University | Kim H.-K.,Korea Institute for Curriculum and Evaluation | And 2 more authors.
Analytical Chemistry | Year: 2016

We report a chromogenic and fluorescence turn-on probe based on crotonoyl ester-functionalized oxazolidinoindole for the selective detection of cysteine in neutral buffer. The probe rapidly formed indocyanophenolate through the Michael addition and a subsequent cyclization reaction of cysteine, inducing both a dramatic bathochromic shift (>130 nm) and a large fluorescence turn-on response (F/F0 12) in the UV-vis and fluorescence spectra and affording a micromolar limit of detection (LOD = 5.0 μM) of cysteine in HEPES buffer. When cysteine was added, the probe exhibited a dual optical change with strong green fluorescence and dramatic red color by the oxazolidinoindole-to-hydroxyethylindolium transformation. Further cellular application of the probe was successfully performed for the mitochondrial imaging of HeLa cells. © 2016 American Chemical Society. Source


Kim H.-K.,Korea Institute for Curriculum and Evaluation
Journal of the Korean Chemical Society | Year: 2014

In this study, we analyzed the characteristics of science academic achievement by multiple culture and North Korean migrant students types, percentage of correct answer and discrimination per items per groups, and contents domains using quantitative and qualitative method in the National Assessment of Educational Achievement (NAEA). As a results of analysis, the degree of science academic achievement of the students from multiple culture and North Korean is much lower than that of the general students. Also, the science academic achievement of the students from multiple culture and North Korean migrant is different from the general students. Especially, science academic achievement of the immigrated students and the North Korean migrant students was lowest. The analysis of items that the difference of the percentage of correct answer was large showed that the students from multiple culture and North Korean migrant were equally weak to it in all contents domains, but that the students from international marriage family born in country were weak in some areas. Therefore, the appropriate the teaching and learning method and the educational support is needed considering the group situation, so the educational implications are discussed. Source


Lee S.W.,Hongik University | Lim J.Y.,Hongik University | Park S.Y.,Hongik University | Kim H.K.,Korea Institute for Curriculum and Evaluation | Shin D.M.,Hongik University
Journal of Nanoscience and Nanotechnology | Year: 2016

To improve irradiation time and the effectiveness photo-alignment, dual decomposition mechanisms including photo and thermal were investigated. For more aggressive photo-decomposition of the polymer, the photoreactions employing triplet mechanism and the double fragmentation reactions were carried out. The polymer was synthesized from terephthalaldehyde followed by the condensation reaction with 1,2,4,5-benzenetetracarboxylic anhydride. The reactive part of the polymer(1) was oxime ester, which is labile to photo-irradiation and high temperature. The polymer(1) was mixed with photo-inert polyimide with various ratio. The polymer synthesis was analyzed using the Fourier transform infrared (FT-IR) spectroscopy and GPC, 1H-NMR spectra and etc. We obtained the polar dichroic ratios and evaluated alignment characteristics of liquid crystal employing polymer(1) as a photo-reactive moiety. Copyright © 2016 American Scientific Publishers. Source


Lee H.-J.,Cheonggye Free Waldorf School | Choi W.-H.,Korea Institute for Curriculum and Evaluation
Journal of the Korean Chemical Society | Year: 2011

We investigated the understanding of pre-service science teacher about the chemistry concept of middle school curriculum using some items in National Assessment of Educational Achievement and analyzed the result according to background variables of pre-service science teacher. The result was that there were some pre-service science teachers who select incorrect answer at all items, pre-service science teachers don't fully understand the concept needed to solve item. And the percentage of correct answer at some items was low regardless of selection of chemistry as an elective subject at CSAT(College Scholastic Ability Test). We found some facts through the depth interviews to find the cause of the result. First, the misconception acquired in middle school days is tend not to change until college student. Second, the formation of misconception is affected by the study habit with which solve problem by simple calculation and memory without essential understanding. Third, the study habit with which solve problem by simple calculation and memory without essential understanding could not replace misconceptions acquired in middle school days with scientific concept regardless of selection of chemistry as an elective subject at CSAT. Source

Discover hidden collaborations