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4차 산업혁명의 도래로 인해 변화하는 교육공간 연구 - 프로젝트 ‘TIMEWAVE’ 를 중심으로 -
김채연 ( Chae Yeon Kim ),이채린 ( Chae Rin Lee ),한유진 ( Yujin Han ) 숙명여자대학교 디자인연구소 2020 숙명디자인학 연구 Vol.28 No.-
현재 인류가 마주하고 있는 4차 산업혁명시대는 다양한 분야에서의 새로운 변화들을 불러일으키고 있다. 그 중 교육환경에서는 학령인구 감소와 다양한 기술들의 융합과 같은 사회적 변화를 바탕으로 새로운 문제해결 능력이 요구되고 있으며 이전과는 다른 관점의 ‘창의성’ 이 필수 역량으로 대두되고 있다. 또한 학교의 본목적이 상실되며 소통의 부재와 같은 교육환경에서 여러 문제들도 발견할 수 있었으며, 그에 따른 문제 해결 방안을 창의성의 변화 양상인 타인과의 창조적인 협력을 의미하는 ‘집단창의성’으로 설정하여 공동체 의식을 기반으로 한 공간의 필요성을 도출하였다. 이에 빠르게 변화하는 시대에 적용할 방향성으로 가치, 탈경계 , 공감 세가지의 요소를 중심적으로 적용해 보려하였고, 백주년 기념관이라는 상징성과 역사성을 학교의 상징인 눈꽃의 원형태 물의 여러 속성과 하강하고 모이고 스미며 번지는 일련의 과정을 대입한 후, 여러 사람과 교류하여 숙명의 가치를 쌓아가며 새롭게 나아가는 공간을 구성해보고자 하였다. 따라서, 본 논문에서는 숙명의 가치를 되돌아보고 함께 공감하며 내부인과 외부인이 경계 없이 교류할 수 있는 공간으로 백주년 기념관을 새롭게 재구성하여 제안하였다. In the 4th Industrial Revolution, which humanity is facing recently, we will prepare for the future educational space by preparing various creativity in the center of collective creativity based on community spirit. Therefore, in this paper, we reconstructed the 100th Anniversary Memorial Hall as a space where people can look back and sympathize with each other and interact with each other without boundaries
Chae, Ari,Jo, Seongho,Choi, Yujin,Ryu, Bowon,Choi, Cheong A.,Park, Sung Young,In, Insik Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.474 No.-
<P><B>Abstract</B></P> <P>Highly water-dispersible and strongly near IR absorbing chemically reduced graphene oxide (rGO)/CP750 assembly was firstly prepared through noncovalent approach from graphene oxide (GO) and CP750, a cyclotriphosphazene ring-based tripodal amphiphile. Through the stable noncovalent interaction by tripodal CP750 amphiphiles, rGO/CP750 assembly presented both high absorption coefficient of 2260 L g<SUP>−1</SUP> m<SUP>−1</SUP> and high near infrared (NIR) absorbance (1.07 at rGO concentration of 0.05 wt.%) in aqueous media without forming precipitates for a long term storage. Upon NIR laser (808 nm) irradiation, rGO/CP750 presented high photothermal heat generating ranging from +34.1 to +78.0 °C depending on the assembly concentration. Finally, excellent photothermal bactericidal performance of nearly 100% was accomplished toward both <I>E. coli</I> and <I>S. aureus</I> even at a low concentration of assembly (0.1 mg/mL) within 10 min of NIR irradiation. In overall, our study shows that high photothermal bactericidal performance that has been mainly claimed by other strongly NIR absorbing nanomaterials such as gold nanorods and semiconducting polymers can be easily accomplished from rGO-based nanomaterials with the proper utilization of tripodal amphiphiles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A tripodal cyclotriphosphazene ring-based tripodal amphiphile for rGO/CP750 assembly. </LI> <LI> Highly soluble and strongly NIR absorbing properties of rGO/CP750 assembly. </LI> <LI> Enhanced photothermal heat generation of rGO/CP750 assembly. </LI> <LI> Nearly 100% bactericidal performance of rGO/CP750 towards <I>E. coli</I> and <I>S. Aureus</I>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Mechanochemical synthesis of fluorescent carbon dots from cellulose powders
Chae, Ari,Choi, Bo Ram,Choi, Yujin,Jo, Seongho,Kang, Eun Bi,Lee, Hyukjin,Park, Sung Young,In, Insik IOP 2018 Nanotechnology Vol.29 No.16
<P>A novel mechanochemical method was firstly developed to synthesize carbon nanodots (CNDs) or carbon nano-onions (CNOs) through high-pressure homogenization of cellulose powders as naturally abundant resource depending on the treatment times. While CNDs (less than 5 nm in size) showed spherical and amorphous morphology, CNOs (10–50 nm in size) presented polyhedral shape, and onion-like outer lattice structure, graphene-like interlattice spacing of 0.36 nm. CNOs showed blue emissions, moderate dispersibility in aqueous media, and high cell viability, which enables efficient fluorescence imaging of cellular media.</P>
수평형 지중열교환기를 이용한 건물일체형 지열시스템의 도입타당성 분석
채호병(Chae Ho-Byung),남유진(Nam Yujin),윤성훈(Yoon Sung-Hoon) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.1
Recently, in order to prevent increasing energy usages in the international community, many countries have attempted to develop the innovative renewable energy systems. Among the renewable energy systems, Ground source heat pump(GSHP) system which supply the heating, cooling and hot water in the building has been attracted by its stability of heat production and high efficiency. However, the initial drilling costs become very expensive and the construction period takes longer the other systems, because GSHP system needs more than 100 m depth drilling. In this study, in order to reduce initial costs of the GSHP, the building integrated geothermal system using the horizontal heat exchanger was developed. The heating and cooling load in the standard housing model was calculated by a simulation and the system design capacity in the high-rise apartment was decided by the total load. Based on the system design capacity, the high-rise apartments were applied to a BIGS and vertical GSHP system and there are analyzed about initial costs. In the result, the initial cost of BIGS could reduce 24% of the initial cost of the vertical GSHP system.
실제 건물 적용을 고려한 태양광열 및 공기열원 융복합 시스템의 동적 해석
채수원(Chae Soowon),배상무(Bae Sangmu),남유진(Nam Yujin) 한국태양에너지학회 2022 한국태양에너지학회 논문집 Vol.42 No.2
As regulations on renewable energy are strengthened and zero-energy buildings are becoming mandatory, research on the commercialization of renewable energy for heating and cooling buildings is accelerating. However, geothermal, photovoltaic, and solar heat are mostly applied as single systems, and there are few cases in which the disadvantages of individual systems are overcome or where the advantages are maximized. The purpose of this study is to develop an analysis model that can respond stably to heating and cooling loads in buildings and to analyze system performance. To stabilize the control of cooling, heating, and hot water supply, the operation method is divided into four cycles. In seasons when cooling and heating loads are significantly decreased, heating and cooling are performed directly by the heat pump without using storage tanks. In addition, a case study using late-night power was conducted to investigate efficient electricity use. Without late-night power, the heat pump coefficient of performance (COP) during the heating period was 2.5 and the monthly average heat exchange rate (HER) was 240 kWh; meanwhile, the COP during the cooling period was 3.99 and the HER was 880 kWh. The energy self-sufficiency rate during the heating period was 2.02 times higher than the cooling period. However, as a result of using late-night power, the electricity rate and COP during heating decreased by 2.5% and 2.04%, respectively, and the COP during cooling increased by 0.1%. This study presents basic data for the implementation of renewable energy systems and the design of predictive models.