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이민백,배준호 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.8
We present the highly enhanced capacitive performance of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) hybridized with SnO2 nanoparticles. The hybridized composites of the conductive polymer and metal oxide nanoparticles (SnO2/PEDOT:PSS) were prepared by dispersing an SnO2 nanopowder in a solution of PEDOT:PSS in water. Fabric supercapacitors using the SnO2/PEDOT:PSS as electrodes exhibited excellent specific capacitances, stable charging–discharging, and low internal resistance. SnO2/PEDOT:PSS demonstrated higher capacitive properties than bare PEDOT:PSS, indicating that hybridization of PEDOT:PSS with SnO2 nanoparticles enhanced the overall performance of the device for electrochemical storage. The enhanced electrochemical behavior of SnO2/PEDOT:PSS is attributed to its higher Brunauer-Emmett-Teller (BET) surface area and the pseudocapacitance of SnO2 nanoparticles. Our work demonstrates that PEDOT:PSS hybridized with SnO2 nanoparticles could be useful in applications for flexible and wearable energy storage devices.
언택트 대응 서비스스케이프 공간시나리오의 사인시스템 사례연구
이민아,백진경 한국공간디자인학회 2022 한국공간디자인학회논문집 Vol.17 No.1
(Background and Purpose) Till date, research on emergency design has focused on presenting countermeasures for evacuation. However, it is necessary to study practical solutions such as spatial scenarios (SS) for the untact-response of servicescapes to cope with emergencies faced due to COVID-19. This study recognized design issues through servicescape case analysis, focusing on signage for untact-responses to establish a service environment in which daily life can be maintained and services can be continuously provided, even in an emergency. (Method) Based on previous studies and the current status of SS in dealing with COVID-19, an analysis tool was presented by theoretically reviewing the SS of servicescapes and signage as physical evidence. An IKEA store was selected as an example of realizing an SS by controlling circulation suitable for untact situations, and the SS for untact-response implemented with signage was analyzed sequentially through space experience. The analysis included the following steps: (1) classification of the sign systems, (2) SS for untact-response by type, and (3) evaluation of spatial service design factors for unexpected situations. (Results) Subsequent to the analysis, the signage was categorized into seven types. In terms of functional composition they were divided into simple composition and complex type, and in terms of design composition, they were divided to express identity-based visual perceptual continuation through color, visualization characteristics for spatial relationships, and visual accessibility according to arrangement and expression method. The signage enabled users to intuitively perceive space through the understanding of circulation by completely dividing the role of providing space experience by sign color, with increased efficiency through selective individual circulation within a single circulation category with shortcut sign sets, and with a regular arrangement of sign sets to inform a new space. It also confirmed that signage is safe, convenient, sustainable, and flexible in dealing with various situations by the repeated arrangement of signs composed of simple images such as logo light. (Conclusions) Among the service systems implemented to meet the needs of modern societies, there were cases of SS that could respond to unpredictable situations because they could be variably applied in emergency situations occurring in daily life. Continuous research from various viewpoints is necessary in these cases. The signage that considers convenience, efficiency, sustainability, and flexibility based on safety realizes an SS for untact-response in a physical space. If its design composition and expression method is realized as a main measure suitable for unpredictable situations, it is expected that it will be possible to construct a servicescape that can flexibly respond to any situation to maintain safety for both service providers and consumers.
이민솔,유혜진,백경희 강원대학교 비교법학연구소 2023 江原法學 Vol.71 No.-
학생의 교육활동 침해로 인한 교원의 교권 위축은 우리나라에서 최근 여러 가지 사건을 통하여 사회적 문제로 대두되고 있다. 더구나 학생의 교육활동 침해행위는 교원의 교권을 침해할 뿐만 아니라 다른 학생의 학습권을 방해하는 결과를 가져온다. 이러한 양상은 외국에서도 나타나고 있는바, 영국이나 미국의 일부 주에서는 법제를 통하여 학생의 교육활동 침해행위에 대하여 교원이 직접 해당 학생을 제재할 수 있는 다양한 방안을 마련하고 있다. 영국의 경우 교육법에서 교원에게 학생에 대한 통제권 및 교육활동 침해학생에 대한 지도 권한으로 금지품목에 대한 수색 및 압수 권한이나 방과 후 구류를 할 수 있는 권한을 부여하고 있다. 미국에서도 텍사스 주법은 교원의 훈육권 내지 지도권으로 학생을 교실에서 퇴출시킬 수 있는 권한을 보장하고 있고, 노스캐롤라이나 주법은 학생의 교육활동 침해행위를 학교폭력의 하나로 다루어 강하게 대응하고 있다. 그런데 학생의 교육활동 침해행위에 대해 교원이 학생을 직접 즉각적으로 제재하게 될 경우, 그 과정에서 학생의 인권과 교권은 불가피하게 서로 충돌할 가능성이 높다. 따라서 학생의 교육활동 침해에 대한 제재 관련 법제 개선에 있어서 정부와 국회의 대응 방향은 기본적으로 양자를 균형 있게 조율하는 것에 초점을 두어야 한다. 이를 위하여 첫째, 현행 법제에서는 여러 법률에 교육활동 침해행위 및 학교의 장과 교원이 침해학생에 대하여 행할 수 있는 조치가 산재되어 있어 체계적으로 정비하는 것이 필요하다. 둘째, 교원의 학생에 대한 직접적인 지도권한을 부여할 때 신체에 대한 적극적 유형력을 행사하는 것을 지양하고, 교원의 지도권한을 상황에 따라 세분화하여 규정하는 방법을 택하는 것이 바람직하다. 셋째, 학교폭력의 대상을 교원으로 확대하고, 학교폭력행위의 유형에 교육활동 침해행위까지 포함하는 것도 고려될 필요가 있다.
ZnSe 나노분말 합성에 미치는 환원제와 첨가제의 영향
백금지,이다경,이민서,송하연,홍현선,Back, Geum Ji,Lee, Da Gyeong,Lee, Min Seo,Song, Ha Yeon,Hong, Hyun Seon 한국분말야금학회 2020 한국분말재료학회지 (KPMI) Vol.27 No.3
Nano-sized ZnSe particles are successfully synthesized in an aqueous solution at room temperature using sodium borohydride (NaBH<sub>4</sub>) and thioglycolic acid (TGA) as the reducing agent and stabilizer, respectively. The effects of the mass ratio of the reducing agent to Se, stabilizer concentration, and stirring time on the synthesis of the ZnSe nanoparticles are evaluated. The light absorption/emission properties of the synthesized nanoparticles are characterized using ultraviolet-visible (UV-vis) spectroscopy, photoluminescence (PL) spectroscopy, and particle size analyzer (PSA) techniques. At least one mass ratio (NaBH4/Se) of the reducing agent should be added to produce ZnSe nanoparticles finer than 10 nm and to absorb UV-vis light shorter than the ZnSe bulk absorption wavelength of 460 nm. As the ratio of the reducing agent increases, the absorption wavelengths in the UV-vis curves are blue-shifted. Stirring in the atmosphere acts as a deterrent to the reduction reaction and formation of nanoparticles, but if not stirred in the atmosphere, the result is on par with synthesis in a nitrogen atmosphere. The stabilizer, TGA, has an impact on the Zn precursor synthesis. The fabricated nanoparticles exhibit excellent photo-absorption/discharge characteristics, suggesting that ZnSe nanoparticles can be alloyed without the need for organic solutions or high-temperature environments.
사면체요소와 육면체요소를 이용한 삼차원 단조 시뮬레이션 결과의 비교 및 검증
이민철(Min Cheol Lee),백종파(Jong Pa Baek),전만수(ManSoo Joun) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In this paper, we simulate a rotor pole cold forging process by a forging simulator with both tetrahedral and hexahedral element capabilities and compare the predictions obtained by the two approaches with the experiments. Hexahedral element capability runs manually while tetrahedral element capability runs automatically with help of an intelligent remeshing technique. It is shown that the tetrahedral element capability can give quite accurate solution if assisted by the intelligent remeshing technique even though the tetrahedral element itself is not theoretically and numerically clear.
글루타티온이 캡핑된 ZnSe 나노 입자 발광 특성에 미치는 합성 조건의 영향
백금지,송하연,이민서,홍현선 한국분말야금학회 2021 한국분말재료학회지 (KPMI) Vol.28 No.1
Zinc selenide (ZnSe) nanoparticles were synthesized in aqueous solution using glutathione (GSH) as a ligand. The influence of the ligand content, reaction temperature, and hydroxyl ion concentration (pH) on the fabrication of the ZnSe particles was investigated. The optical properties of the synthesized ZnSe particles were characterized using various analytical techniques. The nanoparticles absorbed UV-vis light in the range of 350-400 nm, which is shorter than the absorption wavelength of bulk ZnSe particles (460 nm). The lowest ligand concentration for achieving good light absorption and emission properties was 0.6 mmol. The reaction temperature had an impact on the emission properties; photoluminescence spectroscopic analysis showed that the photo-discharge characteristics were greatly enhanced at high temperatures. These discharge characteristics were also affected by the hydroxyl ion concentration in solution; at pH 13, sound emission characteristics were observed, even at a low temperature of 25oC. The manufactured nanoparticles showed excellent light absorption and emission properties, suggesting the possibility of fabricating ZnSe QDs in aqueous solutions at low temperatures.