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      • Rutile TiO₂ Microspheres and Its Mie Scattering

        문정빈,이기라 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1

        TiO2 is has been intensively investigated due to its high refractive index and optical properties. Especially, rutile phase of TiO2 materials is useful because of its stability. However, rutile crystalline phase can be fabricated harsh condition like above 800 degree. Because of this condition, rutile TiO2 particles have problems to keep spherical shape during heat treatment. To address this problem, we have introduced carbon impurity between rutile nanocrystals. While phase transition from amorphous to rutile, rutile nanocrystals are produced but limited their grain size by carbon atoms. Therefore, we can demonstrate monodisperse and spherical rutile TiO2 microspheres. Additionally, we analyzed the Mie-scattering properties of this particle and explored its usability as optical materials.

      • KCI등재

        DNA-Coated Microspheres and Their Colloidal Superstructures

        문정빈,조인성,Etienne Ducrot,오준석,David J Pine,이기라 한국고분자학회 2018 Macromolecular Research Vol.26 No.12

        Reversible and specific interaction between single-stranded DNA on colloidal particles have opened up a new path way of building up colloidal superstructures. DNA-coated microspheres can be bound with other particles with complementary DNA brushes below the melting temperature and can be unbound above the melting temperature. However, due to their random Brownian motion, the particles form random (or glassy) structures in most cases or small crystals when cooling is extremely slow. Therefore, toward programmed colloidal superstructures of DNAcoated microspheres, they should reconfigure their kinetically trapped random structure to equilibrium crystalline structures. While nanoparticles can be rearranged into a crystalline structure by a simple conformational change of relatively long DNA brush, microspheres with short DNA brushes cannot be rearranged only by a conformational change of brush. Instead, sub-diffusion of bound DNA-coated microspheres is necessary which can be possible only with uniform DNA coating with high areal density on microspheres. In this article, we have reviewed methods for the synthesis of high-density DNA-coated microspheres and their assembly into crystalline structures. We also discuss future research direction of DNA-coated microspheres.

      • KCI등재

        주주가치를 통해서 본 기업의 사회적 책임의 비용과 편익의 계량화

        문정빈 ( Jung Bien Moon ),박소정 ( So Jung Park ) 명지대학교 금융지식연구소 2014 금융지식연구 Vol.12 No.1

        기업이 사회적으로 책임있게 행동한다는 것이 기업의 경영성과에 얼마나 큰 도움이 될 것인가? 이 질문에 답하기 위해 본 논문은 KLD에서 제공하는 기업의 사회적 경영성과 자료를 바탕으로 Carhart의 4-팩터 모형을 사용하여 기업의 사회적 경영성과와 주주가치의 관계를 분석하였다. 1991년부터 2006년까지 S&P500 지수에 속한 미국 대기업의 경우, 당해 년도에 사회적 경영성과가 가장 뛰어난 집단에 속한 기업의 주가수익률이 사회적 경영성과가 가장 열악한 집단에 속한 기업의 주가수익률보다 통계적으로 유의하게 높은 것으로 나타났다. 그러나 이미 발표된 지난해의 사회적 경영성과를 바탕으로 포트폴리오를 구성하거나, 5년간의 보유 전략을 사용해서 투자하는 경우에는 통계적으로 유의한 차이가 나타나지 않았다. How much does it pay to be socially responsible? To answer this question, we employed the KLD database as our measure of corporate social performance (CSP), and we applied Carhart`s four-factor model in the field of finance, to quantify the relationship between CSP and financial performance. Our results show that, for large US corporations belonging to the S&P 500 Index, the stocks of companies in the top CSP quantile outperform those of companies in the bottom CSP quantile. The difference was as much as 7.19 percentage points annually from 1991 through 2006, after adjusting for standard risk factors. However, this relationship disappears if we construct our portfolios on the basis of an already published CSP rating or we track the five-year long-run stock performance.

      • KCI등재
      • KCI등재

        미국 주요 기업들에서 관찰되는 기업의 사회적 책임과 기업지배구조: PA,SR 소위원회와 기업의 사회적 경영성과의 관계

        문정빈 ( Jung Bien Moon ) 국제지역학회 2012 국제지역연구 Vol.16 No.1

        본 논문은 2000년-2008년 기간 중에 미국의 S&P 500 지수에 편입된 대기업들을 대상으로 기업의 사회적 책임과 기업지배구조의 관계를 연구한 논문이다. 특히, 이사회 내에 공공부문(PA) 소위원회나 사회책임(SR) 소위원회를 설치하여 통합전략을 추구하는 경영방식이 기업의 사회적 성과(CSP) 와 어떤 연관이 있는 지를 분석하였다. 실증 분석 결과에 따르면, 부정적인 사회적 성과가 소위원회의 설치를 결정하는 주요 요인인 것으로 보이는데, 이는 곳 부정적인 사건사고가 가져온 부정적 기업의 사회적 성과가 이러한 소위원회 설치의 직접적 원인임을 뜻한다. 더 나아가, 이러한소위원회가 설치되면 기업으로 하여금 긍정적인 사회적 성과를 높이는 데에 일조하는 것으로 나타났다. 다시 말해 이러한 이사회 내 소위원회를 설치하는 목적은 기업의 사회적 성과와 관련된 문제가 발생하였을 때 이를 해결하기 위해서인 것으로 보이며, 이와 같은 소위원회들이 설치된 후에는 기업으로 하여금 전략 수립 과정에서 시장, 비시장, 그리고 사회책임 측면을 통합적으로 고려하게 함으로써 긍정적인 사회적 성과를 높이는 것으로 보인다. 따라서 본 논문의 결과는 Baron의 통합전략 프레임웍이 기업들로 하여금 실질적인 결과물을 달성하도록 돕는다는 증거로 볼 수있다. This study investigates the relationship between corporate social responsibility and corporate governance among major US corporations belonging to S&P 500 index during 2000-2008. Specifically, it examines the ways in which firms engage their boards of directors in integrated strategy by establishing a public affairs(PA) or social responsibility(SR) committee at the board level and the effects of this practice on their corporate social performance(CSP). The empirical findings show that negative CSP is the major driver for establishing such a committee, that is, firms suffering from negative CSP as a result of experiencing undesirable social events tend to establish such a committee. On the other hand, such a committee helps the firm increase positive CSP once it is established. In other words, the purpose of establishing such board-level committees is to address problems associated with negative CSP, and once established, they can help enhance positive CSP by enabling the firm to integrate market, non-market, and social responsibility aspects in strategy formulation more effectively. This is evidence that Baron`s integrated strategy framework can help firms achieve tangible outcomes.

      • KCI등재SCOPUS

        조기분만진통 임신부에서 자궁내 감염의 산전 진단과 주산기 예후의 예측에 있어 양수내 백혈구 수 측정과 양수 배양검사의 비교 연구

        문정빈(Jeong Bin Moon),이기주(Ki Joo Lee),강석범(Sok Bom Kang),김길자(Gil Ja Kim),김데리샤(Teresa Kim),박중신(Joong Shin Park),전종관(Jong Kwan Jun),윤보현(Bo Hyun Yoon),신희철(Hee Chul Syn) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.10

        Objectives: To compare the diagnostic and prognostic performance of amniotic fluid white blood cell(AF WBC) count and amniotic fluid culture for the prenatal diagnosis of intrauterine infection and the prediction of neonatal outcomes in patients with preterm labor and intact membranes. Methods: Amniocentesis was performed in 75 patients with preterm labor and intact membranes, who delivered preterm neonates within 72 hours after amniocentesis. AF WBC was determined and amniotic fluid was cultured for aerobic and anaerobic bacteria as well as mycoplasma. The relations among placental histologic findings, perinatal outcome, AF WBC count, and AF culture were examined. Student t test, Mann Whitney U test, χ2 test, Fisher's exact test, modified t test, and logistic regression analysis were used for statistical analysis. Results: Microbial invasion of the amniotic fluid was more frequent in the patients with histologic chorioamnionitis than patients without histologic chorioamnionitis (28.9% vs 5.4%, p<0.05), and patients with histologic chorioamnionitis had significantly higher amniotic fluid white blood cell counts than those patients without such lesion (median 99, range 0-3024 cells/mm3 vs median 1, range 0-180 cells/mm3, p<0.01). Amniotic fluid white blood cell count (≥ 50cell/mm3) had a sensitivity of 55.3%(21/38) and a specificity of 94.6%(35/37) for the diagnosis of histologic chorioamnionitis and a sensitivity of 47.5%(19/40) and specificity of 90.9%(30/33) for the prediction of significant neonatal morbidity (defined as neonatal sepsis, respiratory distress syndrome, pneumonia, intraventricular hemorrhage, bronchopulmonary dysplasia, or necrotizing enterocolitis). These sensitivities were significantly higher than those of amniotic fluid culture (for histologic chorioamnionitis, 55.3% vs 28.9% ; for significant neonatal morbidity, 47.5% vs 25.0%, p<0.01 for each). Conclusion: Amniotic fluid WBC count is a more sensitive test for the prenatal diagnosis of intrauterine infection and for the prediction of significant neonatal morbidity than amniotic fluid culture in the patients with preterm labor and intact membranes.

      • KCI등재SCOPUS

        태아 생물리학적 계수와 제대 천자를 통해 얻어진 태아 혈액 산염기 상태의 상관 관계

        문정빈(Jeong Bin Moon),박중신(Joong Shin Park),전종관(Jong Kwan Jun),윤보현(By Hyun Yoon),신희철(Hee Chul Syn) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.2

        Objective : Fetal biophysical profile is widely used antenatal test for fetal wellbeing, but its biochemical background is not well known. The purpose of this study is to examine the relationship of fetal biophysical profile and cord blood acid base status including gas analysis using cord blood obtained by cordocentesis, by which the biochemical background of fetal biophysical profile can be understood. Study design : 121 pregnant women received cordocentesis for various indication, of whom the fetuses were evaluated with fetal biophysical profile just before the cordocentesis. Cord blood obtained by cordocentesis was analyzed for acid-base and gas status. The results of both tests were compared by appropriate statistical method. Results : Fetal biophysical profile showed definite correlation with the results of cord blood acid-base and gas analysis (p<0.001). Fetal biophysical profile was not a sensitive study for the diagnosis of fetal acidemia, but the test could be used for the diagnosis of severe fetal acidemia. Variables of fetal biophysical profile responded to acidemia differently and there were gradual changes among the variables according to the degree of acidemia. Gestational age was important factor for the normality of nonstress test, even after adjustment of pH level. Anomaly did not affect the fetal biophysical profile and fetal biophysical profile was determined mainly by fetal metabolic status. Conclusion : Fetal biophysical profile score is a useful noninvasive antenatal test reflecting fetal acid base status, effective for the diagnosis of severe acidemia, probably affected by fetal gestational age, but not by fetal anomaly.

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