Ex) Article Title, Author, Keywords
Abstract : This study was analyzed the types of class participation included in the lesson plans of pre-service physics teachers. The elements of class participation were analyzed by dividing them into ‘depth of knowledge’, ‘higher-order thinking’, ‘connectedness to the world beyond the classroom’, ‘substantive conversation’, and ‘social support for student achievement’. The analysis results showed that `depth of knowledge' was presented the most among the types of class participation in lesson plans. In addition, analysis of variance (ANOVA) was conducted to determine whether the types of class participation differed depending on the instruction model. As a result of ANOVA, `depth of knowledge', `connectedness to the world beyond the classroom', and `social support for student achievement' showed significant differences according to the instruction model. Examination of the relationship among class participation types showed positive correlations between `connectedness to the world beyond the classroom' and `social support for student achievement' and between `substantive conversation' and `social support for student achievement'. The results of this study suggest that opportunities for pre-service physics teachers to understand class participation should be expanded in the teacher education curriculum.
Abstract : The three-dimensional off-lattice AB protein model is one of the most successful simplified protein models that incorporates the essential physics of protein folding. In this study, more than one million three-dimensional conformations of the Trp-cage protein are effectively searched in the three-dimensional off-lattice AB protein model using a powerful global optimization method known as conformational space annealing. Among the more than one million three-dimensional conformations of the Trp-cage protein, we focus on ten thousand low-energy conformations. The energy landscape and the optimized three-dimensional structures of the Trp-cage protein are investigated by analyzing the ten thousand low-energy conformations of the Trp-cage protein.
Abstract : Twin boundaries (TBs) are one of the defects that form in most single-crystal growth. Although they are usually considered as one of the grain boundaries (GBs) that satisfy a symmetry operation, the properties and formation mechanism of TBs are very different from those of GBs. In particular, in bulk crystals, TBs are usually analogous to ferroelastic domains. TBs are formed to relieve structurally occurring strain when a phase transitions from a high-temperature phase to a low-temperature phase. They are formed in thin films when two islands with different stacking orders at nucleation meet. At this point, TBs are formed when single-crystal islands meet coherently with a coplanar layer. By contrast, GBs are formed when arbitrarily oriented islands meet incoherently. The effects of TBs and GBs on physical properties are greatly different.
Abstract : In this research, TiO2 nanotube arrays were fabricated by using anodization. The change in alignment due to the change in the diameter of the nanotube bottom in accordance with anodization time was analyzed by using field emission scanning electron microscopy. Individually separated TiO2 was confirmed to have formed in the initial stage of anodization. In this process, the expansion and division of the nanotube proceeded with the prolongation of anodization time. As large-diameter nanotubes divided, the distribution values of the diameters decreased, and the stability degree tended to improve. With the passage of time, when the division of the nanotube had been completed to some extent, the expansion of the nanotube proceeded more predominantly, and the average diameter tended to increase. These findings confirmed that the time of anodization affected the alignment and that the bottom diameter was randomly generated at the beginning. Moreover, during TiO2 nanotube growth, the bottom part not only expanded but also split.
Abstract : P-type oxides using holes as carriers exhibit a relatively low hole mobility due to the deep O 2p level; thus, their potential applications are fewer than those of n-type oxides. Recently, a DFT study has reported that Bi-doped In2O3 forms a new in-gap state near the valence band, thereby lowering the formation energy of the acceptor and enabling the formation of a new p-type oxide through additional doping. In addition, a previous experiment on the Bi-doped In2O3 ceramics revealed the in-gap state. In this study, Bi-doped In2O3 films were grown under various conditions to examine the possibility of optical bandgap modulation. Consequently, from a structural viewpoint, the crystalline size grew as the deposition temperature increased; spectroscopically, two optical absorptions were confirmed. While the larger optical bandgap corresponded to bulk In2O3, the smaller one was associated with a newly formed in-gap state owing to Bi doping. Furthermore, the bandgap energy decreased as the deposition temperature increased. Therefore, the reduced optical bandgap with an increased deposition temperature was related to the reduced quantum size effect.
Woo Tae Hong, Hyun Kyoung Yang
New Phys.: Sae Mulli 2021; 71(3): 236-241
YeonJung PARK, Joonghoe DHO*
New Phys.: Sae Mulli 2021; 71(5): 450-456
Jongwon PARK, Insun LEE*
New Phys.: Sae Mulli 2021; 71(5): 476-489