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Synthesis of Tricyclopentadiene Over Nanoporous MCM-41 Catalysts.
Park, Eunseo,Kim, Jinhan,Yim, Jin-Heong,Han, Jeongsik,Park, Young-Kwon,Jeon, Jong-Ki American Scientific Publishers 2015 Journal of nanoscience and nanotechnology Vol.15 No.7
<P>The objective of this study is to evaluate the catalytic potential of metal oxide/MCM-41 catalysts in dicyclopentadiene oligomerization/dicyclopentadiene oligomer isomerization. Molybdenum oxide, tungsten oxide, and titanium oxide were loaded on MCM-41 using the modified atomic layer deposition method. The amount of the acid site with weak strength has been increased through metal oxide deposition. The oligomer yield in dicyclopentadiene oligomerization/dicyclopentadiene oligomer isomerization did not change with increasing of the amount of acid site. The highest tricyclopentadiene isomer selectivity over the MoO3/MCM-41 catalyst could be attributed to having the highest overall number of acid sites among the catalysts.</P>
Synthesis of Dicyclopentadiene Oligomer Over Nanoporous Al-MCM-41 Catalysts
Park, Eunseo,Kim, Jinhan,Yim, Jin-Heong,Han, Jeongsik,Kwon, Tae Soo,Park, Y. K.,Jeon, Jong-Ki American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.5
<P>One step reaction composed of DCPD oligomerization and DCPD oligomer isomerization was investigated over nanoporous Al-MCM-41 catalysts. The effects of aluminum grafting over MCM-41 on the catalyst characteristics were studied with respect to the synthesis of TCPD isomer. Physical and chemical properties of the catalysts were analyzed by N-2 adsorption, temperature-programmed desorption of ammonia, and infrared spectroscopy of adsorbed pyridine. The overall number of acid sites as well as the number of Lewis acid sites increased with increasing of aluminum content over MCM-41. When utilizing MCM-41 and Al-MCM-41 as the catalyst, DCPD oligomerization reaction activity greatly increased compared to the thermal reaction. The highest TCPD isomer selectivity over the Al-MCM-41 catalyst with the highest aluminum content could be ascribed to the largest amount of acid sites. This study showed an increased level of TCPD isomer selectivity by an increasing level of Lewis acid sites through aluminum addition over MCM-41.</P>
대학생이 지각한 부모양육태도가 자기조절학습에 미치는 영향: 자기결정성의 매개효과
박은서(Park, EunSeo),김동원(Kim, DongWon) 한국동서정신과학회 2021 동서정신과학 Vol.24 No.1
본 연구의 목적은 대학생이 지각한 부모양육태도가 자기조절학습에 미치는 영향에서 자기결정성의 매개효과를 검증하는 것이다. 4년제 대학교에 재학 중인 대학생 371명에게 부모-자녀 유대질문지, 자기조절학습 척도 및 자기결정성 척도를 설문하여 얻은 자료에 대해 SPSS 18.0과 AMOS 18.0을 사용하여 상관분석과 구조방정식 모형을 분석하였다. 주요한 연구결과는 첫째, 대학생이 지각한 부모양육태도는 자기조절학습에 직접적인 영향을 미치지 않았다. 둘째, 대학생이 지각한 부모양육태도는 자기결정성에 직접적인 영향을 미쳤다. 셋째, 자기결정성은 대학생이 지각한 부모양육태도와 자기조절학습의 관계에서 완전매개 효과가 있었다. 자기결정성이 부모양육태도와 자기조절학습의 관계에서 완전매개효과를 보인 본 연구결과는 대학생들의 자기조절학습능력을 향상시키기 위해 자기결정성을 높이는 것이 효과적임을 시사한다. 주요 결과를 바탕으로 연구의 함의와 본 연구의 제한점과 후속연구에 대한 제언을 제시하였다. The purpose of this study is to verify the mediating effect of self-determination on the effect of Parenting Attitude Perceived by College Students on self-regulated learning. This study conducted correlation analysis and analyzed the structural equation model using SPSS 18.0 and AMOS 18.0 for data obtained by surveying 371 university students who were in four-year-course universities with Parental Bonding Instrument, Self-Regulated Learning Scale, Self-Determination Scale. The major findings are as follows. First, the Parenting Attitude Perceived by College Students had no direct effect on self-regulated learning. Second, Parenting Attitude Perceived by College Students had a direct effect on self-determination. Third, self-determination had a complete mediation effect on the relationship between the Parenting Attitude Perceived by College Students and self-regulated learning. The results of this study that showed self-determination’s complete mediation in the relationship between Parenting Attitude and self-regulated learning suggest that facilitating self-determination is effective to improve the self-regulated learning ability of college students who experienced no care from parents or overcaring attitude of parents. Based on the major results, the implications and limitations of this study and suggestions for further research were presented.