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PMMA CeO2와 SiO2를 코팅하여 제작한 적외선 차단필터
유연석,최상석 한국광학회 2006 한국광학회지 Vol.17 No.5
Generally, IR cut-off filters for mobile phone is coated on the glass substrate at high temperature(above 300oC). In this work, we prepared IR cut-off filters on the poly(methyl methacrylate)(PMMA) substrates at low temperature(about 70oC). using the CeO2 and SiO2 coatings by physical vapor deposition. The surface energies of coated and uncoated PMMA, and adhesive properties of IR cut-off filters coatings were examined using contact angle measurements. We demonstrate the improve of mobile phone optical system using these results.
PVdF-HFP/TiO2 나노복합체 보호층을 통한 리튬금속전지 음극의 전기화학적 성능 향상
이상현,최상석,김동언,현준혁,박용욱,유진성,전소윤,박중원,신원호,손희상 한국막학회 2021 멤브레인 Vol.31 No.6
고용량 배터리에 대한 요구가 증가에 따라 기존 음극재보다 높은 용량(3,860 mAh/g)과 낮은 전기화학적 전위(– 3.040 V)를 갖는 리튬 금속 기반 음극재에 대한 연구가 활발하게 이루어지고 있다. 본 연구에서는 수열 합성을 통해 제작된 아나타제(anatase) 타입의 TiO2 나노 입자 기반한 PVdF-HFP/TiO2 복합체를 리튬 금속 음극의 계면 보호층으로 적용하였다. 결정구조 및 형상 분석을 통해 유/무기-리튬 나노복합체 박막의 형성을 확인하였다. 또한, 전지화학 테스트(사이클 테스트 및 전압 프로파일)를 통해 리튬 금속 음극의 전기화학 성능은 복합체 보호막이 TiO2 10 wt%, 코팅 두께 1.1 μm의 조건에서 가장 개선된 전기화학적 성능(콜롱 효율 유지: 77 사이클 동안 90% 이상) 발현을 확인하였다. 이를 통해, 처리하지 않은 리튬 전극 대비 본 보호층에 의한 리튬 금속 음극의 성능 안정화/개선 효과가 검증되었다. As the demand for high-capacity batteries increases, there has been growing researches on the lithium metal anode with a capacity (3,860 mAh/g) of higher than that of conventional one and a low electrochemical potential (–3.040 V). In this study, using the anatase phased TiO2 nanoparticles synthesized by hydrothermal synthesis, a PVdF-HFP/TiO2 organic/inorganic composite material was designed and used as an interfacial protective layer for a Li metal anode. As-formed organic/inorganic-lithium composite thin film was confirmed through the crystalline structure and morphological analyses. In addition, the electrochemical test (cycle stability and voltage profile) confirmed that the protective layer of PVdF-HFP/TiO2 composite (10 wt% TiO2 and 1.1 μm film thickness) contributed to the enhanced electrochemical performance of the lithium metal anode (Colombic efficiency retention: 90% for 77 cycles). Based on comparative test with the untreated lithium electrode, it was confirmed that our protective layer plays an important role to stabilize/improve the EC performance of the lithium metal negative electrode.
김헌민,김찬호,양승우,최상석 대한국토·도시계획학회 2002 國土計劃 Vol.37 No.3
The major problems facing the undergraduate education in planning today are the lack of disciplinary identity and the diminishing competitiveness in the job market. In addressing these problems, this study develops models of curriculum reform for college planning departments. To identify the educational requirements that planning curriculum should fulfill, a number of studies are undertaken: employment rates and job distribution of recent graduates who majored in planning; subjects required for various professional license examinations and for graduate school admissions; and a survey of professionals in private and public sectors. Two types of curriculum model are developed in this study: a model by engineering and social science orientation in planning and a model by professional areas of planners.