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Cho, Won Chul,Lee, Doyeon,Kim, Chang Hee,Cho, Hyun Suk,Kim, Sang Done Elsevier 2018 APPLIED ENERGY Vol.216 No.-
<P><B>Abstract</B></P> <P>The chemical looping strategy for hydrogen production (CLH<SUB>2</SUB>) offers a potentially viable option for efficient fuel conversion to hydrogen with the simultaneous capture of CO<SUB>2</SUB>. Typically, this process uses an iron-based composite as an oxygen carrier and syngas or methane as a fuel. The environmental and economic concerns motivate the use of abundant by-product iron oxide and the industrial off-gas for CLH<SUB>2</SUB>. Here we showed that H<SUB>2</SUB> could be simply recovered from the industrial off-gas in a circulating fluidized bed with a mixture of the inexpensive raw material of by-product iron oxide and sand particle. The fluidization of the by-product iron oxide powder, which showed poor fluidization behavior, is improved by adding 60 vol% of sand particle. The industrial off-gas was completely converted to CO<SUB>2</SUB> and H<SUB>2</SUB>O in a two-stage fluidized mode with a solid reactant of Fe<SUB>2</SUB>O<SUB>3</SUB> of the binary particles<SUB>,</SUB> and then H<SUB>2</SUB> was produced by oxidizing the reduced by-product iron oxide powder with steam. The binary particles showed consistent catalytic activity under multiple redox cycles by providing macropores with a size of ∼5 μm which facilitated gas diffusion. These findings provided valuable information for the future development of CLH<SUB>2</SUB> based on by-products.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Industrial off-gas is upgraded to H<SUB>2</SUB> using iron oxide in chemical looping process. </LI> <LI> By-product iron oxide exhibits good fluidization behavior by addition of sand. </LI> <LI> Industrial off-gas is completely oxidized in 2-stage fluidized bed. </LI> <LI> Recycled by-product iron oxide shows good cyclibility by providing porous structure. </LI> <LI> H<SUB>2</SUB> and CO<SUB>2</SUB>-rich gas can be produced in separate streams of 3-step cycle. </LI> </UL> </P>
Doyeon Kim,Sungho Lee,Daehwan Park,Yeong Sik Cho,Sunyoung Choi,Yoon Sung Nam,Jin Woong Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
Hectorite nanoplatelets (HNPs) have intriguing surface properties such as high specific surface areas andhigh cation exchange capacities. Here, we introduce a facile but robust approach to fabricate attractivehectorite nanoplatelets (AHNPs), in which the surfaces of HNPs were hydrophobically modified by using acationic surfactant, dimethyldioctadecylammonium chloride. The chemical and structural characteriza-tion, performed by X-ray diffraction, Fourier transform infrared spectroscopy, confocal laser scanningmicroscopy, and transmission electron microscopy, revealed that the edge of AHNPs was richlyfunctionalized with hydroxy groups. We then prepared the organogels byfinely dispersing the AHNPs inthe silicone oil by repeated high-pressure homogenization. Suspension rheology studies suggested thatthe interaction between AHNPs led to the formation of a strong gel phase, which exhibited a reversiblesol-gel transition in response to the applied shear stress. This was attributed to the weak, but long-rangedinteraction between AHNPs in the silicone oil, which were induced by hydrogen bonding between thefew hydroxyl groups that are present at the edges of the AHNPs. The AHNPs fabricated in this study areexpected to be widely used as rheology modifiers in various oil-based complexfluids.
( Doyeon Chae ),( Junghyun Min ),( Yewon Cho ),( Chaeyoung Lee ),( Yunhee Kim ) 한국유아교육학회 2023 INTERNATIONAL JOURNAL OF EARLY CHILDHOOD EDUCATION Vol.29 No.1
The purpose of the present study was to explore preschool teachers’ perceptions of early childhood creativity using the metaphorical analysis method, to understand the self-reported performance of these teachers in teaching creativity and the metaphorical image they associate with children’s creativity. We employed the Teaching Performance Scale for Enhancing Creativity in Young Children, developed by Moon (1995), along with an open-ended questionnaire to collect teachers’ metaphors regarding children’s creativity. A total of 211 preschool teachers from across the country participated in the online survey. After analyzing the metaphors for children’s creativity, initially, 21 categories were identified. These categories were then further consolidated into four main themes: ‘divergent thinking,’ ‘malleability’ ‘diverse characteristics,’ and ‘needs for investment.’ The metaphors related to ‘fluency’ and ‘originality’ were prevalent across the high-performing, middle-performing, and low-performing groups. However, there was a difference in the third-most-used metaphors among the different groups. Based on the key findings, the implications for the direction of early childhood creativity education were discussed.
상업 피트니스 센터의 내부마케팅, 시장지향성, 경영성과 간의 구조관계
조정환 ( Cho Jung-hwan ),원도연 ( Won Doyeon ),석부길 ( Seok Boo-gil ) 한국스포츠산업경영학회 2016 한국스포츠산업경영학회지 Vol.21 No.4
본 연구의 목적은 피트니스 센터의 내부마케팅과 시장지향성, 경영성과 간의 구조적 관계를 분석하고, 각 요인들의 인과관계 및 구조관계를 분석하여 피트니스 센터 경영성과 달성을 위해 필요한 자료를 제시하는데 있다. 연구의 목적을 달성하기 위해 피트니스 센터의 경영자 및 종사원들을 대상으로 총 283부의 설문지를 회수하였고, 자료 분석을 위해 빈도분석, 신뢰도분석, 확인적 요인분석, 상관관계분석을 실시하였고, 구조방정식 모형분석을 실시하였다. 분석결과는 다음과 같다. 첫째, 내부마케팅은 시장지향성에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 내부마케팅은 경영성과에 긍정적인 영향을 미치는 것으로 나타났다. 셋째, 시장지향성은 경영성과에 긍정적인 영향을 미치는 것으로 나타났다. 넷째, 시장지향성은 내부마케팅과 경영성과 사이에서 조절하지 않는 것으로 나타났다. 위와 같은 내용을 바탕으로 살펴보면 피트니스 센터의 관리자들은 경영성과를 높이기 위해 내부마케팅전략을 활용하고 내, 외부적인 상황을 정확이 파악하여 시장지향적 문화를 만들어야 할 것이다. This study is aimed at providing managers and owners of fitness center,s with necessary information for improving manageral performance by analyzing Inter Marketing, Market Orientation and Management Performance and by anlyzing the cause and effect relationship of each factor and their structural relationship. In order to achieve the purpose of study, 283 questionnaires were distributed among fitness centers` employers and employees. For data analysis, analysis of frequency, reliability analysis, confirmatory factor analysis, correlation analysis and structure equation model analysis were used. Results are followed as. First, Internal Marketing gave a positive effect on Market Orientation. Second, Inter Marketing gave a positive effect on Management Performance. Third, Market Orientation gave a positive effect on Management Performance. Lastly, Market Orientation had no effect as a moderator between Internal Marketing and Management Performance. Based on the results, fitness centers` managers` should apply Inter Marketing to increase Management Performance and should try to understand interior and exterior situation precisely to create market-dominant culture.