염료감응형 태양전지의 비백금 상대전극을 위한 Co가 내재된 Graphitic 다공성 탄소나노섬유

안혜란,강혜린,선효정,한지호,안효진,An, Hye Lan,Kang, Hye-Rhin,Sun, Hyo Jeong,Han, Ji Ho,Ahn, Hyo-Jin 한국재료학회 2015 한국재료학회지 Vol.25 No.12

Co-embedded graphitic porous carbon nanofibers(Co-GPCNFs) are synthesized by using an electrospinning method. Their morphological, structural, electrochemical, and photovoltaic properties are investigated. To obtain the optimum condition of Co-GPCNFs for dye-sensitized solar cells(DSSCs), the amount of cobalt precursor in an electrospinning solutuion are controlled to be 0 wt%(conventional CNFs), 1 wt%(sample A), and 3 wt%(sample B). Among them, sample B exhibited a high degree of graphitization and porous structure compared to conventional CNFs and sample A, which result in the performance improvement of DSSCs. Therefore, sample B showed a high current density(JSC, $12.88mA/cm^2$) and excellent power conversion efficiency(PCE, 5.33 %) than those of conventional CNFs($12.00mA/cm^2$, 3.78 %). This result can be explained by combined effects of the increased contact area between the electrode and elecytolyte caused by improved porosity and the increased conductivity caused by the formation of a high degree of graphitization. Thus, the Co-GPCNFs may be used as a promising alternative of Pt-free counter electrode in DSSCs.

저비용·고성능 상대전극을 위한 Pt 촉매/다공성 탄소나노섬유의 광기전력 특성평가

안혜란,구본율,배주원,김종민,안효진 한국진공학회 2015 한국진공학회 학술발표회초록집 Vol.2015 No.2

지역사회 거주 성인남성의 금연의도 관련요인

안혜란 한국지역사회간호학회 2015 지역사회간호학회지 Vol.26 No.4

Purpose: This study was conducted to identify the factors associated with intention to quit smoking in community- dwelling male adult smokers in Korea. Methods: This study was cross-sectional research that used data of 4,010 male smokers. Data from the 2013 Community Health Survey were analyzed through multiple logistic regression. Results: Of the male adult smokers, 65.64% reported that they had an intention to quit smoking. In the logistic regression analysis, age, amount of smoking per day, previous attempts to quit smoking, exposure to smoking-quitting campaigns, and toothbrushing after lunch were significantly associated with intention to quit smoking. Conclusion: These factors should be considered in developing policies and population-based smoking cessation programs to increase smoking cessation among Korean men.

영재교육에서의 융합인재교육(STEAM) 연구 동향 분석

안혜란,유미현 韓國英才學會 2015 영재교육연구 Vol.25 No.3

본 연구의 목적은 현재까지의 융합인재교육(STEAM; 이후 STEAM교육으로 통일)의 연구 동향과 영재교육에서의 STEAM교육 연구 현황을 비교 분석하고 영재 STEAM교육 프로그램의 특징을 분석하여 영재 STEAM교육의 연구를 위한 개선점을 제언하는데 있다. 분석한 결과는 다음과 같다. 첫째, STEAM교육 연구는 최근 2∼3년간 급격히 증가하고 있고 STEAM교육 연구에서 영재교육이 차지하는 비율이 상대적으로 높았다. 둘째, STEAM교육 연구와 영재교육에서의 STEAM교육 연구 모두 초등학생을 대상으로 한 연구가 가장 많았다. 셋째, 영재교육에서의 STEAM교육 프로그램 개발 연구는 과학중심 연계형 융합 프로그램을 중심으로 다양하게 연구되고 있다. 예술영역은 미술이 융합된 프로그램 중심에서 차츰 다양한 영역으로 확대되고 있으며 5가지 융합 요소를 모두 포함한 형태가 가장 많았다. 학습형태는 STEAM 준거 교수학습모형이 가장 많이 개발되었으며 영재의 특성에 맞는 학습 모형을 적용한 다양한 학습 형태가 연구되고 있다. 프로그램 적용 연구로는 창의성에 미치는 효과를 알아보는 연구가 가장 많았다. The purpose of this study was to perform a comparative analysis of the research trends in STEAM education in gifted education and suggest educational implications to improve the current STEAM education for the gifted. The results were as follows. First, STEAM education has been increasing in the past couple of years and gifted and talented education took up relatively high proportion of it. This demonstrates that gifted education closely related to creative and versatile individuals plays a leading role in STEAM education. Second, researches on STEAM education and STEAM education for the gifted targeted elementary school students the most. Third, researches on the development of STEAM program for the gifted have been mainly addressing science-oriented convergence programs. Among them, programs including all the five combined factors(Science, Technology, Engineering, Arts and Mathematics) were the most common. In terms of learning types, a criterion-referenced teaching-learning model has been developing and there were diverse learning types which applied teaching-learning models tailored to characteristics of a gifted child. The researches related to STEAM programs’application effects on creativity were most dominant.

국내 인쇄회로기판의 재활용 상용화 기술 및 연구동향 분석

안혜란,강이승,이찬기,An, HyeLan,Kang, Leeseung,Lee, Chan-Gi 한국자원리싸이클링학회 2017 資源 리싸이클링 Vol.26 No.4

최근 전자산업의 급격한 성장으로 전자부품스크랩의 발생량 역시 빠르게 증가하고 있다. 특히 전자부품스크랩의 구성부품 중 인쇄회로기판(PCB)은 금, 은, 구리, 주석 및 니켈 등 일반금속부터 귀금속 및 희소금속까지 포함하고 있는 중요한 재활용 대상이다. 하지만 국내에는 일부 대기업을 중심으로 한 PCB 처리 및 재활용 기술이 상용화되어 있으며 그 외 처리량에 대해서는 정확하게 집계되지 않고 있는 실정이다. 이에 따라 몇몇 도시광산 업체 및 연구소, 대학교를 중심으로 기존 대기업 중심의 상용화 공정 외에 PCB로부터 유가금속을 회수하고 원료로 재사용하는 연구가 진행되고 있다. 따라서 본 연구에서는 국내의 폐 PCB의 처리 및 회수현황과 재활용 기술 동향을 분석하였고, 이를 통해 PCB 폐자원의 자원순환 활성화에 기여하고자 하였다. Recently, the amount of electronic scrap is rapidly increasing due to the rapid growth of the electronics industry. Among the components of electronic scrap, the printed circuit board(PCB) is an important recycling target which includes common metals, precious metals, and rare metals such as gold, silver, copper, tin, nickel and so on. In Korea, however, PCB recycling technologies are mainly commercialized by some major companies, and other process quantities are not accurately counted. According to present situation, several urban mining companies, research institutes, and universities are conducting research on recovery of valuable metals from PCBs and/or reusing them as raw materials that is different from existing commercialization process developed by major companies. In this study, we analyzed not only current status of collection/disposal process and recycling of waste PCBs in Korea but also the trend of recycling technologies in order to help resource circulation from waste PCBs become more active.

COVID-19 상황에서 간호학생의 대학생활적응 영향요인

안혜란,이지영 중소기업융합학회 2021 융합정보논문지 Vol.11 No.3

본 연구는 코로나19(COVID-19)라는 위기 상황에서 간호학생의 전공선택동기, 학업 스트레스, 자기효능감 및 대학생활적응 정도를 파악하고, 대학생활적응에 영향을 미치는 요인을 파악하기 위한 서술적 조사연구이다. 2개 지역의 간호학생 243명을 편의모집하였고, 수집된 자료는 SPSS for Windows Ver. 22.0을 이용하여 기술통계, t-test, ANOVA, Scheffé test, Pearson’s correlation coefficient, Multiple linear regression으로 분석하였 다. 연구결과 전공선택동기와 자기효능감은 높을수록, 학업스트레스는 낮을수록 대학생활적응이 높은 것으로 나타 났다. 대학생활적응에 영향을 미치는 요인은 자기효능감, 전공선택동기, 한 달 용돈 금액 순으로 나타났으며, 대학 생활적응에 대한 이들 변수의 설명력은 65.6%로 나타났다. 이에 간호학생의 대학생활적응을 높이기 위해서는 자기 효능감을 높여주기 위한 대학생활적응 프로그램의 개발 및 적용이 필요하다. The purpose of this study was to investigate the major selection motivation, academic stress, self-efficacy and college life adjustment and identify influencing factors of college life adjustment in the crisis situation of COVID-19. 243 nursing students were selected from 2 regions through convenience sampling. Data were analyzed through descriptive statistics, t-test, ANOVA, Scheffé test, Pearson’s correlation coefficients and multiple linear regression analysis using SPSS for Windows Ver. 22.0. The higher the major selection motivation and self-efficacy, the higher the college life adjustment. The lower the academic stress, the higher the college life adjustment. The factors influencing college life adjustment were self-efficacy, major selection motivation, monthly allowance, and the explanatory power of these variables for college life adjustment was 65.6%. Therefore, in order to improve the nursing students’ college life adjustment, it is necessary to develop and apply college life adjustment program to increase self-efficacy.

성과기반 지역사회간호학실습 온라인 프로그램 개발과 운영 성과

안혜란,오수현 전남대학교 간호과학연구소 2023 Nursing and Health Issues(NHI) Vol.28 No.2

Purpose: The study aimed to evaluate the efficacy of an online program developed to improve community health nursing practice. Methods: After applying the online program, the achievement level of learning outcomes and satisfaction with content were evaluated. Results: A total of 124 students participated in this study. The achievement level of all 15 learning outcomes significantly increased after applying online program. in pre-post test. The mean score for learning outcomes ranged from the lowest of 4.33 to the highest of 4.76 out of 5, indicating a high overall level of achievement. The content that contributed the most towards achieving the learning outcomes was core nursing skills, scoring 4.70 out of 5. Lecture and pre-learning had the highest satisfaction rate at 72.6%, respectively. The area with the highest demand for improvement was practical education, which was 50.0%. Conclusion: In this study, the online program was effective in achieving learning outcomes. It is It is necessar y to consider the expanding and paralleling online practice that can contribute to the achievement of learning outcomes.

가임기 여성의 질에서 분리한 젖산 세균인 Lactobacillus plantarum UK-3의 특성 및 항균활성

안혜란,소재성,오계헌,Ahn, Hye-Ran,So, Jae-Seong,Oh, Kye-Heon 한국미생물학회 2011 미생물학회지 Vol.47 No.4

본 연구는 가임기 여성의 질로부터 젖산균인 Lactobacillus plantarum UK-3를 분리하여 다양한 생리화학적 특성조사와 여러 가지 병원균들에 대한 항균활성을 확인하고자 실시하였다. 균주 UK-3는 MRS 배지에서 배양되었으며, 형태학적 관찰 및 생화학적 특성을 조사하였으며, 16S rRNA 염기서열 분석을 통해 균주를 동정하여, Lactobacillus plantarum UK-3로 명명하였으며, GenBank에 [JK266589]로 등록하였다. 배양기간 동안에 L. plantarum UK-3의 생장과 유기산의 생성, pH 변화를 조사하였으며, HPLC를 사용하여 대사산물로서 생성된 젖산(lactic acid)과 아세트산(acetic acid)을 정량 및 정성분석 하였다. 이들 유기산의 생성은 L. plantarum UK-3의 생장과 비례하였고, 배양 48시간 경과 후에 젖산과 아세트산의 농도는 각각 약 684.11 mM과 174.26 mM이었으며, 초기 pH 7.0은 배양기간 동안 3.7로 감소하였다. 여성의 질에서 감염의 가능성이 있는 10가지의 그람양성 세균, 그람음성 세균, 그리고 효모에 대하여 25배로 농축된 배양상등액을 처리하여 plate diffusion assay 방법으로 항균활성을 측정하였다. 그 결과 본 연구에 사용된 10가지 미생물에 대해서 광범위하게 항균효과가 있는 것이 관찰되었으며, 정상균총으로서 다른 젖산세균인 Lactobacillus acidophilus에 대해서는 항균활성을 나타내지 않았다. The purpose of this work was to examine the antimicrobial activity derived from the lactic acid bacterium, UK-3 isolated from the vaginas of women of childbearing age. Various physiological and biochemical properties of this strain were characterized. Both the BIOLOG system and phylogenetic analysis using 16S rRNA sequencing were utilized for identification, and the strain was designated as Lactobacillus plantarum UK-3, and registered in GenBank as [JK266589]. Growth rate, production of organic acids (e.g., lactic acid and acetic acid), and pH during growth were monitored. The maximum concentrations of lactic acid and acetic acid were approximately 684.11 mM and 174.26 mM, respectively, and pH changed from 7.0 to 3.7 after 72 h of incubation. High performance liquid chromatography was used to confirm lactic acid and acetic acid production. Significant antimicrobial activity of the concentrated supernatant was demonstrated against various Gram-positive (e.g., Staphylococcus aureus, Staphylococcus epidermidis, Methicillin-resistant Staphylococcus aureus, Enterococcus faecalis, Neisseria species., Listeria monocytogenes), Gram-negative bacteria (e.g., Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis), and yeast (e.g., Candida albicans) by the plate diffusion method. As a result, the concentrated L. plantarum UK-3 cultures had lower acidity and inhibited the growth of all microorganisms tested, whereas the growth of L. acidophilus was not affected.

Characterization of porous carbon nanofibers decorated with Pt catalysts for use as counter electrodes in dye-sensitized solar cells

안혜란,안건형,안효진 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.2

Porous carbon nanofibers decorated with Pt catalysts (Pt/PCNFs) are prepared by electrospinning and impregnation methods. To synthesize the PCNF, poly(styrene-co-acry-lonitrile) (SAN), a pore-forming agent, is added to polyacrylonitrile (PAN), the carbon nanofiber (CNF) precursor. With regard to photovoltaic properties, Pt/PCNFs fabricated using the optimum amount of 0.5 wt% SAN polymer exhibit a larger open circuit voltage (Voc) of 0.73 V, a higher fill factor (FF) of 66.57%, and an excellent photoconversion efficiency (η) of 6.47% compared to carbon nanofibers decorated with Pt catalysts (Pt/CNFs) and commercial Pt solutions under standard test conditions (100 mW/cm2 (1 sun); AM 1.5G spectrum).

전남 해안지역 거주 성인의 사회경제적 수준과 C형간염과의 관계

안혜란 한국간호과학회 2016 한국간호과학회 학술대회 Vol.2016 No.10