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지각된 인기도와 또래 괴롭힘 가해 및 방어 행동의 관계에서 내외통제성의 매개효과
조유진 ( Cho¸ Yujin ) 미래를 여는 청소년학회 2019 미래청소년학회지 Vol.16 No.2
본 연구는 중학교에 재학 중인 청소년들을 대상으로 이들의 지각된 인기도와 또래괴롭힘 방어행동 및 가해행동의 관계에서 내외통제성의 매개효과를 분석하였다. 이를 위해 2017년 9월부터 11월까지 서울, 경기, 경남 소재 국공립 중학교 1,2,3학년에 재학 중인 308명의 학생들을 대상으로 자료를 수집하였다. 수집된 자료는 SPSS Win 23.0과 Macro 프로그램을 통해 분석되었다. 주요 결과는 다음과 같다. 첫째, 청소년들의 지각된 인기도가 높아질수록 또래괴롭힘 가해행동 및 방어행동이 증가하였다. 둘째, 지각된 인기도와 또래괴롭힘 가해행동의 관계에서 내외통제성의 매개효과를 검증한 결과, 외적 통제의 매개 효과만이 검증되었다. 셋째, 지각된 인기도와 또래괴롭힘 방어행동의 관계에서는 내적 통제의 매개 효과만이 검증되었다. 즉, 청소년의 외적통제성은 가해행동에 통계적으로 영향을 미치는 반면, 내적통제성은 방어행동에 통계적으로 영향을 미치는 것으로 나타났다. 이러한 결과를 토대로 청소년들의 또래괴롭힘을 예방하고 중재하기 위한 교육적 및 상담적 방안이 논의하였다. This study analyzed the mediating effects of locus of control on the relationships between the perceived popularity and defending behavior- bullying behavior with youths in middle schools. The data were collected from 308 students in the first, second, and third grades of national and public middle schools located in Seoul, Gyeonggi, and Kyungnam from September 2017 to November 2017. The collected data were analyzed using SPSS Win 23.0 and the Macro program. The main results are as follows. First, bullying behavior and defending behavior increased as youths' perceived popularity increased. Second, when the mediating effects of locus of control on the relationship between perceived popularity and bullying behavior were examined, only the mediating effects of external control were identified. Third, when the mediating effects of locus of control on the relationship between perceived popularity and defending behavior were examined, only the mediating effects of internal control was identified. That is, whereas external control of youths has an effect on bullying behavior statistically, internal control of youths has an effect on defending behavior statistically. Based on these results, educational and counseling methods to prevent and mediate peer bullying in youths were discussed.
Cho, Seongeun,Kim, Youngjun,Park, Yujin,Choi, Miri,Park, Jun-young,Lee, Jihoon,Park, Sungyoung,Chang, Mincheol,Cho, Jiung,In, Insik,Park, Byoungnam American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.45
<P>A comprehensive understanding of the effect of polymer chain aggregation-induced molecular ordering and the resulting formation of lower excited energy structures in a conjugated polymer on exciton dissociation and recombination at the interface with a wide-bandgap semiconductor is provided through correlation between structural arrangement of the polymer chains and the consequent electrical and optoelectronic properties. A vertical diode-type photovoltaic test probe is combined with a field effect current modulating device and various spectroscopic techniques to isolate the interfacial properties from the bulk properties. Enhanced energy migration in the quasi-ordered (poly(3-hexylthiophene)) (P3HT) film, processed through vibration-induced aggregation of polymer chains in solution state, is attributed to the presence of the aggregation induced interchain species in which excitons are allowed to migrate through low barrier energy sites, enabling efficient iso-energetic charge transfer followed by the downhill energy transfer. We discovered that formation of nonemissive excitons that reduces the photoluminescence quantum yield in the P3HT film deactivates exciton dissociation at the donor (P3HT) close to the acceptor (ZnO) as well as in the P3HT far away from the ZnO. In other words, exciton deactivation in its film state arising from the quasi-ordered structural arrangement of polymer chains in solution is retained at the donor/acceptor interface as well as in the bulk P3HT. Effect of change in the highest occupied molecular orbital level and the resulting energy band bending at the P3HT/ZnO interface on exciton dissociation is also discussed in relation to the presence of vibration-induced aggregates in the P3HT film.</P>
Anisotropic phonon softening of uniaxially strained bilayer graphene
Cho, Yujin,Jegal, Seonyoung,Lee, Jae-Ung,Yoon, Duhee,Choi, Seon-Myoung,Son, Young-Woo,Cheong, Hyeonsik Elsevier 2016 Carbon Vol.103 No.-
<P>The effect of strain on the phonon dispersion of bilayer graphene has been studied by polarized Raman spectroscopy on uniaxially strained bilayer graphene. Each of the four peaks that constitute the Raman 2D band splits and redshifts under strain, with the shift rate depending on the strain direction relative to the crystallographic orientation. By comparing the experimental data with first-principles calculation results, it is shown that the splitting and the redshift of the peaks originate from the anisotropic modifications of the phonon dispersion and the electronic band structure of bilayer graphene. The intensity of each peak also depends on the magnitude and direction of strain, which can be explained in terms of the correlation with the momentum of the phonon involved in the Raman scattering path. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Genome Architecture and Transcriptome Analysis of Marine Cyanobacteria Synechocystis sp. PCC 7338
Yujin JEONG,Seong-Joo HONG,Sang-Hyeok CHO,Seonghoon YOON,Hookeun LEE,Hyung-Kyoon CHOI,Dong-Myung KIM,Choul-Gyun LEE,Suhyung CHO,Byung-Kwan CHO 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.4
Cyanobacteria producing various bio-products are considered promising microbial cell factories. The marine cyanobacterium Synechocystis sp. PCC 7338 has the advantage of growing in seawater, rather than requiring arable land or freshwater. However, how this marine cyanobacterium grows under the high salt stress condition remains unknown. Here, we determined the 3.70 Mbp complete genome of Synechocystis sp. PCC 7338. Differential RNA-seq and Term-seq data provided genome-wide information on genetic regulatory elements. Comparison with freshwater Synechocystis sp. strains revealed that Synechocystis sp. PCC 7338 genome encodes additional genes, which facilitate the adaptation to high salt and high osmotic pressure. A cyclic electron transport through photosystem I actively used by Synechocystis sp. PCC 7338 satisfied the demand for ATP under high salt environment. Our comprehensive analyses provide valuable information to discover the various genomic functions and regulations available for engineering Synechocystis sp. PCC 7338.
Synthesis of AlON materials for UV emitting devices
Cho, Yujin,Koo, Jieun,Cho, Youngji,Lee, Woong,Lee, Jeungwoo,Lee, Byeongwoo,Lee, Sangtae,Chang, Jiho WILEY‐VCH Verlag 2013 Physica status solidi. PSS. C, Current topics in s Vol.10 No.5
<P><B>Abstract</B></P><P>Aluminum oxynitride (AlON), which is conventionally used as one of the ceramics with good thermal and chemical stability, has an attractive candidate for a tunable extreme UV luminous material due to its unique combination of properties and UV luminescence. In this paper, we have synthesized the novel AlON UV emitting materials, which have a wavelength from 4.29 to 4.54 eV, and discovered the core (AlON)‐shell (Al<SUB>2</SUB>O<SUB>3</SUB>) like structures in a transmission electron microscopy. Furthermore, their potential application in a UV light emitter has been demonstrated by applying the combination with a CNT field emission cold cathode, which has been made by a simple printing method. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)</P>