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- 저자 : Kwon Kyungmi (검색결과 11 건)
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Kwon, Hyeok-Chan,Yang, Wooseok,Lee, Daehee,Ahn, Jihoon,Lee, Eunsong,Ma, Sunihl,Kim, Kyungmi,Yun, Seong-Cheol,Moon, Jooho American Chemical Society 2018 ACS NANO Vol.12 No.5
<P>Organometal halide perovskite materials have become an exciting research topic as manifested by intense development of thin film solar cells. Although high-performance solar-cell-based planar and mesoscopic configurations have been reported, one-dimensional (1-D) nanostructured perovskite solar cells are rarely investigated despite their expected promising optoelectrical properties, such as enhanced charge transport/extraction. Herein, we have analyzed the 1-D nanostructure effects of organometal halide perovskite (CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3-<I>x</I></SUB>Cl<SUB><I>x</I></SUB>) on recombination and charge carrier dynamics by utilizing a nanoporous anodized alumina oxide scaffold to fabricate a vertically aligned 1-D nanopillared array with controllable diameters. It was observed that the 1-D perovskite exhibits faster charge transport/extraction characteristics, lower defect density, and lower bulk resistance than the planar counterpart. As the aspect ratio increases in the 1-D structures, in addition, the charge transport/extraction rate is enhanced and the resistance further decreases. However, when the aspect ratio reaches 6.67 (diameter ∼30 nm), the recombination rate is aggravated due to high interface-to-volume ratio-induced defect generation. To obtain the full benefits of 1-D perovskite nanostructuring, our study provides a design rule to choose the appropriate aspect ratio of 1-D perovskite structures for improved photovoltaic and other optoelectrical applications.</P> [FIG OMISSION]</BR>
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Kim, Kyungmi,Kwon, Hyeok-Chan,Ma, Sunihl,Lee, Eunsong,Yun, Seong-Cheol,Jang, Gyumin,Yang, Hyunha,Moon, Jooho American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.36
<P>Organic-inorganic hybrid perovskite solar cells (PSCs) have recently attracted tremendous attention because of their excellent efficiency and the advantage of a low-cost fabrication process. As a transparent electrode for PSCs, the application of copper nanowire (CuNW)-network was limited because of its thermal/chemical instability, despite its advantages in terms of high optical/electrical properties and low-cost production. Here, the copper-nickel core-shell nanowire (Cu@Ni NW)-based composite electrode is proposed as a bottom window electrode for PSCs, without the involvement of a high-cost precious metal and vacuum process. The dense and uniform Ni protective shell for CuNWs is attainable by simple electroless plating, and the resulting Cu@Ni NWs exhibit outstanding chemical stability as well as thermal stability compared with bare CuNWs. When the Ni layer with the optimal thickness is introduced, the Cu@Ni NW electrode shows a high transmittance of 80.5% AVT at 400-800 nm, and a sheet resistance of 49.3 ± 5 Ω sq<SUP>-1</SUP>. Using the highly stable Cu@Ni NWs, the composite electrode structure is fabricated with sol-gel-derived Al-doped zinc oxide (AZO) over-layer for better charge collection and additional protection against iodine ions from the perovskite. The PSCs fabricated with AZO/Cu@Ni NW-based composite electrode demonstrate a power conversion efficiency (PCE) of 12.2% and excellent long-term stability maintaining 91% of initial PCE after being stored for 500 h at room temperature. Experimental results demonstrate the potential of highly stable Cu@Ni NW-based electrodes as the cost-effective alternative transparent electrode, which can facilitate the commercialization of PSCs.</P> [FIG OMISSION]</BR>
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박승원,권희홍,유혜선,조경미 국립중앙박물관 2010 박물관보존과학 Vol.11 No.-
국립춘천박물관이 소장한 서대(犀帶)의 보존처리 과정과 제작기법에 대해 소개하고자 한다. 서대는 가죽으로 된 틀을 직물로 감싸고 물소뿔과 금속테로 만든 띠돈을 장식한 형태이다. 가죽간의 접착력이 약화되어 분리가 진행중이고 서각의 일부가 탈락되었으며 직물의 변·퇴색이 진행되고 있다. 또한 금속테 부분과 띠돈을 연결한 금속사가 심하게 부식되었다. 금속부분의 성분분석을 위해 이동형 X-선형광분석기를 이용하여 비파괴 분석을 실시하였고 전체를 해체하여 재질에 따른 보존처리를 실시하고 다시 재결합하는 방법으로 보존처리를 진행하였다. Here is an introduction of the conservation and making process of Seodae(Rank Belt with A Rhinoceros' Horn) of the Chuncheon National Museum. The seodae has a structure composed of wrapping fabric around a leather frame and decorated with ttidon(an ornament) made of a rhinoceros' horn and a metal frame. The adhesion between leather was weak and separation was taking place, parts of the horn were missing and the fabric was discoloring. Also the metal frame and the metal wire attaching ttidon were severly corroded. Nondestructive analysis was carried out by using a portable x-ray fluorescence spectroscopy to analyze the components of the metal parts. Conservation was carried out by dismantling parts and carrying out conservation process of each one according to material, then the parts were put back together.
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Antecedents of Within-industry Diversification: Evidence from the Korean Life Insurance Industry
Yunhee Chang(장윤희),Kuhyuk Kwon(권구혁 ),Kyungmi Chun(전경미),Houk Lee(이호욱) 연세대학교 경영연구소 2021 연세경영연구 Vol.58 No.2
본 연구는 기존 전략경영 문헌에서 다각화와 기업 성과의 상관관계에 대한 연구에 비해 상대적으로 많이 연구되지 않았던 산업 내 다각화의 동인을 탐구하는 실증 연구라는 점에 의의가 있다. 그동안 회계/재무 분야에서 연구된 보험 산업의 재무적 특성을 주로 고려한 연구에서 나아가, 본 연구는 다각화에 동원될 수 있는 다양한 자원의 측면과 기업의 지배구조의 성격에 따라 산업 내 다각화의 특성에 어떠한 영향이 있는지를 종합적으로 고려한 연구라는 점에서 학술적인 의의를 갖는다. 또한, 본 연구의 차별적 공헌점은 바로 한국의 생명보험산업이라는 단일 산업을 대상으로 다양한 자원과 기업의 지배 구조의 성격을 검증할 수 있는 패널 데이터를 구축하고 이를 기반으로 실증 연구를 진행하였다는 점이다. 해당 산업 내 다양한 제품 출시는 보험 산업이라는 제도적 특성이 존재함에도, 개별 기업의 보험 산업의 자원과 역량을 최대한 활용할 수 있는 가장 가까운 산업인 손해보험 산업으로의 진출이 제도적으로 불가능하다. 이러한 상황에서 기업 내부 자원의 다양한 성격과 기업의 지배 구조가 다각화 추구에 어떠한 영향을 미치는지를 검증하였다. 먼저, 기존 다각화 연구에서 일원화되었던 기업의 재무 자원이 본 실증 연구의 대상 산업에서는 기존 제품에 구분하여 별도의 회계 계정을 유지하고 있어 다각화를 위한 전용 재무 자원을 측정하고 검증하였다는 연구의 공헌점이 있다. 또한, 기업이 내부에 보유한 자원이라 할지라도 기존 주력 상품의 판매에 최적화되어 있는 자원(비대면 판매 채널)이 새로운 제품 출시에 있어서는 부의 영향을 미친다는 사실을 실증적으로 검증하였다는 점은 기존 성과 중심의 산업 내 다각화 연구에 비해 본 연구가 갖는 차별적 공헌점이라 할 수 있다. 향후 본 연구를 확장하여 후속 연구에서는 산업 내에서 제품 다각화를 추구하는 기업의 전략적 행위를 탐색함에 있어 더 다양한 기업 지배 구조 성격 변수와 자원의 성격을 추가적으로 고려할 수 있을 것이다. 또한, 단일 산업 내에서의 제품 다각화가 궁극적으로 어떠한 성과 함의를 지니는지에 대해서도 고려할 수 있을 것이다. We examine what makes firms diversify within an industry, considering several characteristics of corporate resources and the moderating influence of corporate governance. While most diversification studies have investigated how diversification influences firm performance without consideration of the industry to which the firm belongs, this study verifies what drives within-industry diversification with consideration of internal resources and corporate governance. Similarly, research in the fields of corporate finance and insurance has focused mostly on the impact of financial characteristics on firm performance; in this study, we examine many aspects of corporate internal resources that can be mobilized for the purpose of diversification, sales resources that are optimized to benefit the existing product category. To verify our results empirically, we investigate firms in the Korean life insurance industry where within-industry diversification is clearly evident. In this industry, firms intentionally and institutionally pursue within-industry diversification similar to how they pursue product-level diversification; thus, within-industry diversification closely mirrors detailed strategic choices at the product level. We collected data from 25 insurers for the fiscal years ranging from 2007 to 2017 to form 264 panel data for analysis. The results of the empirical analysis suggest that firms with internal resources such as affiliate relationships for new product management show tendencies toward high within-industry diversification. However, firms with accumulated resources idealized for the existing product market exhibit less within-industry diversification. This study’s theoretical contribution is to provide a comprehensive perspective on within-industry diversification. This construct has not been explored, nor have its characteristics and determinants been clearly identified as compared to inter-industry diversification.
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Ma, Sunihl,Ahn, Jihoon,Oh, Yunjung,Kwon, Hyeok-Chan,Lee, Eunsong,Kim, Kyungmi,Yun, Seong-Cheol,Moon, Jooho American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.17
<P>Organic-inorganic hybrid perovskite solar cells (PSCs) are considered promising materials for low-cost solar energy harvesting technology. An electron transport layer (ETL), which facilitates the extraction of photogenerated electrons and their transport to the electrodes, is a key component in planar PSCs. In this study, a new strategy to concurrently manipulate the electrical and optical properties of ETLs to improve the performance of PSCs is demonstrated. A careful control over the Ti alkoxide-based sol-gel chemistry leads to a craterlike porous/blocking bilayer TiO<SUB>2</SUB> ETL with relatively uniform surface pores of 220 nm diameter. Additionally, the phase separation promoter added to the precursor solution enables nitrogen doping in the TiO<SUB>2</SUB> lattice, thus generating oxygen vacancies. The craterlike surface morphology allows for better light transmission because of reduced reflection, and the electrically conductive craterlike bilayer ETL enhances charge extraction and transport. Through these synergetic improvements in both optical and electrical properties, the power conversion efficiency of craterlike bilayer TiO<SUB>2</SUB> ETL-based PSCs could be increased from 13.7 to 16.0% as compared to conventional dense TiO<SUB>2</SUB>-based PSCs.</P> [FIG OMISSION]</BR>
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Anti-Alpha-Toxin Antibody Responses and Clinical Outcomes of Staphylococcus aureus Bacteremia
Kim Nak-Hyun,Choi Yunjung,Kwon Kyungmi,Park Jeong Su,Park Kyoung Un,Moon Song Mi,Song Kyoung-Ho,Kim Eu Suk,Park Wan Beom,김홍빈 대한의학회 2023 Journal of Korean medical science Vol.38 No.16
Background: Alpha-toxin (AT), a major virulence factor of Staphylococcus aureus, is an important immunotherapeutic target to prevent or treat invasive S. aureus infections. Previous studies have suggested that anti-AT antibodies (Abs) may have a protective role against S. aureus bacteremia (SAB), but their function remains unclear. Therefore, we aimed to investigate the association between serum anti-AT Ab levels and clinical outcomes of SAB. Methods: Patients from a prospective SAB cohort at a tertiary-care medical center (n = 51) were enrolled in the study from July 2016 to January 2019. Patients without symptoms or signs of infection were enrolled as controls (n = 100). Blood samples were collected before the onset of SAB and at 2- and 4-weeks post-bacteremia. Anti-AT immunoglobin G (IgG) levels were measured using an enzyme-linked immunosorbent assay. All clinical S. aureus isolates were tested for the presence of hla using polymerase chain reaction. Results: Anti-AT IgG levels in patients with SAB before the onset of bacteremia did not differ significantly from those in non-infectious controls. Pre-bacteremic anti-AT IgG levels tended to be lower in patients with worse clinical outcomes (7-day mortality, persistent bacteremia, metastatic infection, septic shock), although the differences were not statistically significant. Patients who needed intensive care unit care had significantly lower anti-AT IgG levels at 2 weeks post-bacteremia (P = 0.020). Conclusion: The study findings suggest that lower anti-AT Ab responses before and during SAB, reflective of immune dysfunction, are associated with more severe clinical presentations of infection.
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