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Properties of Working Electrodes with Diamond Blends in Dye Sensitized Solar Cells
Choi, Minkyoung,Noh, Yunyoung,Song, Ohsung The Korean Ceramic Society 2015 한국세라믹학회지 Vol.52 No.5
We prepared blocking layers by adding 0.0 ~ 0.6 wt% nano diamond blends (DBs) to $TiO_2$ blocking layers to improve the energy conversion efficiencies (ECEs) of dye sensitized solar cells (DSSCs). TEM and micro-Raman spectroscopy were used to characterize the microstructure and phases of DBs, respectively. Optical microscopy and FE-SEM were used to analyze the microstructure of the $TiO_2$ blocking layer with DBs. UV-VIS-NIR spectroscopy was used to determine the absorbance of the working electrodes. A solar simulator and a potentiostat were used to determine the photovoltaic properties and the impedance of the DSSCs with DBs. From the results of the DBs analysis, we determined a 6.97 nm combination of nano diamonds and graphite. We confirmed that ECE increased from 5.64 to 6.48 % when the added DBs increased from 0.0 to 0.2 wt%. This indicates that the effective surface area and electron mobility increased when DBs were added to the $TiO_2$ blocking layer. Our results indicate that the ECE of DSSCs can be enhanced by adding an appropriate amount of DBs to the $TiO_2$ blocking layers.
Choi, Minkyoung,Noh, Yunyoung,Kim, Kwangbae,Song, Ohsung Materials Research Society of Korea 2016 한국재료학회지 Vol.26 No.4
We prepared polymethyl methacrylate (PMMA) beads with a particle size of 80 nm to improve the energy conversion efficiency (ECE) by increasing the effective surface area and the dye absorption ability of the working electrodes (WEs) in a dye sensitized solar cell (DSSC). We prepared the $TiO_2$ layer with PMMA beads of 0.0~1.0 wt%; then, finally, a DSSC with $0.45cm^2$ active area was obtained. Optical microscopy, transmission electron microscopy, field emission scanning electron microscopy, and atomic force microscopy were used to characterize the microstructure of the $TiO_2$ layer with PMMA. UV-VIS-NIR was used to determine the optical absorbance of the WEs with PMMA. A solar simulator and a potentiostat were used to determine the photovoltaic properties of the PMMA-added DSSC. Analysis of the microstructure showed that pores of 200 nm were formed by the decomposition of PMMA. Also, root mean square values linearly increased as more PMMA was added. The absorbance in the visible light regime was found to increase as the degree of PMMA dispersion increased. The ECE increased from 4.91% to 5.35% when the amount of PMMA beads added was increased from 0.0 to 0.4 wt%. However, the ECE decreased when more than 0.6 wt% of PMMA was added. Thus, adding a proper amount of PMMA to the $TiO_2$ layer was determined to be an effective method for improving the ECE of a DSSC.
최계영(Choi GaeYoung),최민경(Choi MinKyoung),김명수(Kim MyeoSu),김종찬(Jong-Chan Kim),김치용(Kim Chee-yong) 한국멀티미디어학회 2007 한국멀티미디어학회 학술발표논문집 Vol.2007 No.1
빠른 경제성장과 함께 도시환경에 대한 관심증가는 도시환경조성이 도시의 생명력에 중요한 요소가 된다는 사실을 인식하고 1995년 지방자치제가 실행됨으로써 지자체의 활성화와 자립기반조성 및 경쟁력 강화를 위하여 지역 고유의 이미지 확립을 위한 여려 방안의 시도하고 있다. 본 연구는 안동시 가로환경시설물 사례분석을 통하여 지방이 가지고 있는 역사적, 문화적 특징을 반영하여 지역 고유 이미지를 표현할 수 있는 가로 환경시설물들을 설치하고자 하는 지방자치단체들에게 도움을 주고자 한다.
Artificial neural network study on organ-targeting peptides
Jung, Eunkyoung,Kim, Junhyoung,Choi, Seung-Hoon,Kim, Minkyoung,Rhee, Hokyoung,Shin, Jae-Min,Choi, Kihang,Kang, Sang-Kee,Lee, Nam Kyung,Choi, Yun-Jaie,Jung, Dong Hyun Springer-Verlag 2010 Journal of computer-aided molecular design Vol.24 No.1
Minkyoung Shin,Jungsoon Choi,Munkhtsetseg Luvsan J-INSTITUTE 2022 International Journal of Human & Disaster Vol.7 No.1
Purpose: In the present time, the interest in looks has rapidly increased regardless of gender and age, and we are living through the age of priority over looks. An individual s looks is not merely a simple caring, but has also become a social competitiveness, which increases the interest in looks and enhances the body image and self-esteem. The purpose of this study is to examine and understand the effect of the body image and the interest in looks perceived by female college students on the empathy of overcoming disaster targeting the female college students. Method: As for the research method, a questionnaire was used targeting female college students in Seoul, Gyeonggi, Incheon, and other areas. The questionnaire was consisted of body image, interest in looks, and interpersonal variables, while the frequency analysis was performed to examine the general characteristics of the re-search subjects, and the multiple regression analysis was performed to examine the interpersonal relationship between the body image and the interest in looks. Results: First, in terms of the effect of the female college student s body image on the empathy of overcoming disaster, it turned out that among the body images, the interest in looks turned out to have an effect on cognitive empathy, emotional empathy, and attitude empathy, and among the body images, the body satisfaction turned out to have effect on the emotional empathy and attitude empathy. Second, in terms of the effect of the female college student s body image on the empathy of overcoming disaster, aesthetic orientation turned to have effect on the cognitive empathy, emotional empathy, and the attitude empathy among the interest in looks, and self-expression among the interest in looks turned out to affect the emotional empathy only. Conclusion: Given the current ‘COVID-19’ crisis, many problems have ravaged the world, and as disasters pro-long, the interest in overcoming disasters has also grown. At the same time, the interest in looks is rapidly increasing due to the priority over looks. Hence, this study has examined the effect of body image and interest in looks perceived by the female college students on the empathy of overcoming disaster, and recognizes the importance of empathy for the interest in looks, and hence, more research would be required.