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Yujeong Park,Min Kyung Kim 서울대학교 교육연구소 2015 Asia Pacific Education Review Vol.16 No.4
This study aimed to provide information about the quality of the evidence on reading fluency instruction for at-risk students and students with reading/learning disabilities as a way to evaluate whether an instructional strategy is evidence-based and has potential for classroom use. An extensive search process with inclusion and exclusion criteria yielded a total of 18 studies to be included in the present study: 12 group design studies and six single-subject design studies. The quality indicators proposed by Gersten et al. (Except Child 71:149–164, 2005) and Horner et al. (Except Child 71:165–179, 2005) were applied to evaluate the quality of selected fluency intervention studies. Results revealed that (a) most group design studies provided little information about the intervention and agent for the comparison group, (b) internal and social validity were not clearly stated in single-subject design studies, and (c) procedural fidelity in assessment and intervention implementation was inadequately addressed in both group design and single-subject design studies. Lack of methodological rigor, which hampers determinations of the effectiveness of fluency instruction, the current status of intervention studies, and future directions are discussed.
Formation mechanism of BAMLET by 2D Raman correlation analysis
Park, Yeonju,Park, Yujeong,Jin, Sila,Kim, Jung Won,Jung, Young Mee Elsevier 2018 Journal of molecular structure Vol.1171 No.-
<P><B>Abstract</B></P> <P>A partially unfolded bovine α-lactalbumin (ALA) and oleic acid (OA) complex called bovine α-lactalbumin made lethal to tumor cells (BAMLET) is a tumoricidal complex. For the first time, this study investigated the pH-induced formation mechanism of the ALA/OA complex using Raman spectroscopy. For a deeper understanding of the formation mechanism of the ALA/OA complex with decreasing pH, principal component analysis (PCA) and two-dimensional correlation spectroscopy (2D-COS) were applied to pH-dependent Raman spectra of the ALA/OA complex. Based on the results of the PCA and 2D-COS analyses, we successfully elucidated the formation mechanism of the ALA/OA complex at the molecular level. We also confirm that the ALA/OA complex formed below pH 3.0.</P> <P><B>Highlights</B></P> <P> <UL> <LI> For the first time, we investigated the pH-induced formation mechanism of the α-lactalbumin/oleic acid (ALA/OA) complex using Raman spectroscopy. </LI> <LI> We successfully elucidated the formation mechanism of the ALA/OA complex at the molecular level. </LI> <LI> Results of the PCA and 2D-COS analyses showed the ALA/OA complex formed below pH 3.0. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Triboelectric nanogenerators with transfer-printed arrays of hierarchically dewetted microdroplets
Park, Chanho,Yu, Seunggun,Cho, Suk Man,Song, Giyoung,Lee, Yujeong,Kang, Han Sol,Lee, Seung Won,Eoh, Hongkyu,Park, Cheolmin Elsevier 2018 Nano energy Vol.51 No.-
<P><B>Abstract</B></P> <P>Triboelectric nanogenerators (TENG) is of great interest as an emerging power harvester due to its simple device architecture and high efficiency. Despite development of various surface modification techniques for enhancing the performance of a TENG with a given triboelectric pair of materials, a method capable of being used universally on a variety of surfaces and improving the performance of TENGs with diverse surfaces remains a challenge. Here, we demonstrate a novel transfer-printing technique of hierarchically dewetted polymer droplets on various TENG surfaces for performance enhancement of the TENGs. Our method is based on controlled dewetting of a thin supramolecular assembled film of two end-functionalized polymer blends on a prepatterned poly(dimethyl siloxane) mold, followed by the physical pattern-transfer of arrays of the dewetted droplets consisting of supramolecular assembled nanostructures on a TENG contact surface. The hierarchically dewetted microdroplets comprising soft-etched nanopores efficiently improve the performance of a TENG by more than three times compared to one without the transferred pattern. The pattern-transfer is successfully achieved on various surfaces including not only oxides, plastics, rubbers, and metals, but also fabrics, coins, vegetables, and shells, making our approach a convenient way for enhancing the triboelectric performance of a given TENG.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Transfer printing was used as a versatile tool to enhance contact area of a TENG. </LI> <LI> The performance of a TENG was improved by more than three times with the pattern. </LI> <LI> A variety of surfaces were suitable, including oxides, plastics, rubbers, and metals. </LI> <LI> Transfer printing well occurred on stretchable, bendable, and roughened substrates. </LI> <LI> The printing offers opportunities for broadening the choice of materials for TENGs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Yujeong Park,Hwa Yeun Nam,Joon-Ho Lee 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
The Bemisia tabaci (Hemiptera: Aleyrodidae) is a pest that sucks a plant's phloem, excretes nectar and infects tomatoes with TYLCV (Tomato Yellow Leaf Curl Virus), causing severe economic damage. In order to explore the cause for occurrence of areas where the genetic structure of B. tabaci MED (Mediterranean) was reversed in a short period of time, this study was conducted. We collected and analyzed the B. tabaci MED populations from tomato greenhouses in some areas where their genetic structure was reversed between two years 2016 and 2017. As a result, the genetic structure of B. tabaci MED populations was found to be close between populations of the nursery and the greenhouses where tomato seedlings were supplied from that nursery, even if greenhouses were located far away each other. Further study is needed to identify the causes for occurrence of abrupt reverse of genetic structures of B. tabaci MED populations observed in some areas throughout the country.