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류지현 ( Ryou Ji-hyun ),김현주 ( Kim Hyun-joo ) 대구가톨릭대학교 인문과학연구소 2021 인문과학연구 Vol.- No.42
This study aims to understand the trends of multicultural research in Korea. A total of 576 KCI (Korean Citation Index) studies published during 2007-2020 were analyzed. The studies were categorized in terms of research methods, target groups, themes, academic disciplines, and publication year. Results show that the prevalence of normative studies during the early phase gave way to empirical and data-driven studies during the late phases. The focus of the studies shifted from the conceptualization of multiculturalism, policies, and macro societal issues to concerns of specific population groups, individuals’ adaptation and social integration, and local receptivity, to list a few. The findings of the study were discussed considering academic and policy-related implications. In addition, a more active approach to diverse themes and groups across a variety of academic fields is required.
포스터 전시회 : 가열된 표면 위에서 충돌하는 뉴턴과 비뉴턴 액적의 동적 거동
문주현 ( Joo Hyun Moon ),정찬호 ( Chan Ho Jeong ),이여해 ( Yeo Hae Lee ),이진운 ( Jin Woon Lee ),김주헌 ( Jooheon Kim ),유홍선 ( Hong Sun Ryou ),이성혁 ( Seong Hyuk Lee ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
This article illustrates the temperature dependent spreading and receding characteristics of a Newtonian and a non-Newtonian droplet impact on a heated solid surface at different Weber numbers with surface temperatures. To make non-Newtonian droplets, a xanthan gum solution was used with different concentrations. From a high-speed camera images, spreading and receding diameters were captured during the impact process. For impact velocity and solid surface temperature, distinct differences in spreading and receding motions were found between Newtonian and non-Newtonian droplets. If a solid surface temperature increases, the maximum spreading diameter slightly increased at DI-water droplet whereas the maximum spreading diameters of xanthan gum droplets were similar for all surface temperatures. This is due to viscosity change on thin liquid lamella contact with heated surface. The receding phenomena could be clearly distinguished on the heated surface. The retraction rate of a xanthan gum droplet increased by increase Weber number whereas DI-water droplets were constant. Because both shear thinning and heat affected liquid lamella influenced a droplet receding, shear viscosity of the xanthan gum droplets decreased faster than the DI-water.
Large area multi-stacked lithium-ion batteries for flexible and rollable applications
Kim, Joo-Seong,Lee, Yong-Hee,Lee, Inhwa,Kim, Taek-Soo,Ryou, Myung-Hyun,Choi, Jang Wook The Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.28
<P>The demand for lithium ion batteries (LIBs) in various flexible mobile electronic devices is continuously increasing. With this in mind, a vast number of smart approaches, such as implementation of conductive nanomaterials onto paper and textiles, have been recently demonstrated. Most of them were, however, limited to the single-cell level. In the present study, large area flexible battery modules were developed in an attempt to expand the knowledge and design accumulated from the single-cell level approaches to larger-scale applications. A multi-stacked configuration was adopted to produce a high areal energy density in each single-cell. Meanwhile textile-based electrodes on both sides grant mechanical stability, even on the module level, by efficiently releasing the stress generated during aggressive folding and rolling motions. Moreover, the connection between and stacking of the single-cells allow the wide tuning of the overall voltage and capacity of the module. This battery design should be immediately applicable to a broad range of outdoor, building, and military items.</P>
Recycling rice husks for high-capacity lithium battery anodes
Jung, Dae Soo,Ryou, Myung-Hyun,Sung, Yong Joo,Park, Seung Bin,Choi, Jang Wook National Academy of Sciences 2013 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.110 No.30
<P>The rice husk is the outer covering of a rice kernel and protects the inner ingredients from external attack by insects and bacteria. To perform this function while ventilating air and moisture, rice plants have developed unique nanoporous silica layers in their husks through years of natural evolution. Despite the massive amount of annual production near 10<SUP>8</SUP> tons worldwide, so far rice husks have been recycled only for low-value agricultural items. In an effort to recycle rice husks for high-value applications, we convert the silica to silicon and use it for high-capacity lithium battery anodes. Taking advantage of the interconnected nanoporous structure naturally existing in rice husks, the converted silicon exhibits excellent electrochemical performance as a lithium battery anode, suggesting that rice husks can be a massive resource for use in high-capacity lithium battery negative electrodes.</P>