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청소년이 지각한 어머니의 양육행동, 자아인식 및 학교적응 간의 구조적 관계
유지아(Yoo, Jia․,Jeong),정혜숙(Jeong, Hyesuk),김영희(Kim, Yeonghee) 충북대학교 생활과학연구소 2019 생활과학연구논총 Vol.23 No.2
The purpose of this study was to examine the structural relationships among mothers’ parenting behavior, adolescents’ self-perception and school adjustment based on a survey data. The study participants were 772 middle school student. Data were analyzed in SPSS 21.0, and the model test was done with an analysis of the correlation matrix in AMOS 21.0, using structural equation analysis. The results were as follows. First, mothers’ parenting behavior had direct effects on the adolescents’ self-perception and school adjustment. Second, the adolescents’ self-perception has a direct effect on school adjustment. Furthermore, the adolescents’ self-perception had mediated between mother’s parenting behavior and adolescents’ school adjustment. In conclusion, the results of this study implied the significance of mother’s parenting behavior as well as adolescents’ self-perception to improve adolescent’s school adjustment.
Jia, Xicheng,Jeong, Yanghwan,Baik, Hionsuck,Choi, Jungkyu,Yip, Alex C.K. Elsevier 2018 CATALYSIS TODAY - Vol.314 No.-
<P><B>Abstract</B></P> <P>We designed a core-shell zeolite structure comprises of palladium-deposited ZSM-5 core and silicalite-1 (S-1) shell which favors selectivity towards light olefin in hydrogenation via increased diffusion length. A well designed S-1/Pd/ZSM-5 core-shell structure was prepared via secondary crystallization of S-1 layer on the Pd/ZSM-5 core. The catalytic and selectivity performance of the S-1/Pd/ZSM-5 composite was evaluated in catalytic hydrogenation of alkenes in liquid phase. The synthesized S-1/Pd/ZSM-5 gives a much higher selectivity towards 1-hexene (87%) over cyclohexene (13%) even though both reactants are able to enter the 10-membered ring channels of the core-shell structure. The zeolitic core-shell composite also showed an increasing selectivity towards 1-hexene over 1-heptene as the S-1 layers built up, even though both are linear alkenes with similar kinetic diameter that are accessible to the MFI framework. In this work, we demonstrate a strong correlation between the thickness of the S-1 shell layer and the selectivity towards light olefins due to faster mass transfer rate. The design of the core-shell MFI structure is a new example of how selectivity in a zeolite-catalyzed reaction can be changed and enhanced without relying on typical molecular size exclusion process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A synthesis method for a core-shell S-1/Pd/ZSM-5 composite is reported. </LI> <LI> The S-1 shell can distinguish alkenes with similar size/shape via diffusion length. </LI> <LI> Selectivity of MFI zeolite can be augmented without changing the pore size. </LI> <LI> The core-shell design broadens the applications of MFI in selective reactions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>