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장시간 충방전에 따른 VRFB-ESS의 용량 손실 회복에 대한 연구
서혜경,박원식,박재우,김강산,최한솔,Hai-Kyung, Seo,Wonshik, Park,Jae-woo, Park,Kangsan, Kim,Hansol, Choi 한국전력공사 2022 KEPCO Journal on electric power and energy Vol.8 No.2
As the charges/discharges of VRFB-ESS were repeated during 150cycles or more, the capacity of electrolyte in VRFB-ESS was decreased little by little. It results from the decreasing of the level of anolyte and the increasing of the valance value of the catholyte. Then, we tried to recover the capacity loss with 3 different ways. The first way was that the levels of anolyte and catholyte were allowed to be evenly equalized when the difference in the levels of two different electrolytes were severe. The second one was to lessen the valance value of the catholyte through the reduction reaction to 4-valant ions of 5-valant ions in the catholyte with the reductant, oxalic acid. The last one was that the all electrolytes of analyte and catholyte were allowed to be electro-chemically reduced to 3.5 of the valance value by oxidizing new electrolyte with 3.5 valance ions. The last way was the most effective to recover the capacity loss.
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VRFB-ESS용 전해질의 이온가수 분석방법 및 SOC 분석
서혜경,박원식,김강산,Seo, Hai-Kyung,Park, Wonshik,Kim, Kangsan 한국전력공사 2021 KEPCO Journal on electric power and energy Vol.7 No.2
For the detection of the state of charge in VRFB-ESS, the analyses of UV-Visible spectrometry and the measurements of potential between the anolyte and catholyte were used in parallel. This paper includes the production of 4-valant ion from VOSO4 powder, 3- and 5-valant ions from electrochemical charge of 4-valant ion and 2-valant ion from 3-valant ion. It also includes the analyses of these valance ions and unknown electrolyte at any time using UV-Visible spectrometry. Through the analyses of the valance ions in samples, the SOCs of the samples at any charge-discharge times were verified.
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Dependence of Electronic Spectra on the Degree of Conjugation in Organocobalt(Ⅲ) Complexes
서혜경,봉찬아,황영애,Hye Kyung Seo,Chan Ah Bong,Young Ae Hwang Park Korean Chemical Society 1993 대한화학회지 Vol.37 No.12
효소모델 코발트 화합물의 전자스펙트럼에서 축상의 이온성 리간드와 코발트사이의 전하전이에 해당하는 흡수띠의 위치가 극성도에 따라 변화하는 현상이 평면상의 거대고리 리간드의 공액도와 어떠한 상관관계가 있는가에 대하여 다음과 같은 여러가지의 공액도를 가진 거대고리 리간드의 유기코발트 착화합물을 사용하여 연구하였다. 완전히 공액인 $CH_3CoL,\;C_6H_5CoL,\;CNCoL,\;CH_3CoL',\;CNCoL'$부분적으로 공액인 $CH_3(py)Co(DH)_2, CH_3CoL"$, 비공액의 이중결합을 포함하는 $[CH_3Co(1,4-CT)](ClO_4)_2$와 고리가 완전히 닫히지 않은 $CH_3Co(salen)$이 그들이다. 코발트와 탄소사이의 전하전이 흡수띠는 평면상의 거대고리 리간드가 완전히 공액일 때에만 용매의 극성도가 증가함에 따라 더욱 짧은 파장으로 이동하였고, 그에 해당하는 전이에너지$(E_T)$는 용매의 극성도(Z)와 직선의 상관관계에 있었으나, 거대고리 리간드가 불완전한 공액이거나 고리가 닫히지 않았을 때에는 전이 에너지와 용매의 극성도 사이에 상관관계를 발견할 수 없었다. The electronic spectra of enzyme-model organocobalt(Ⅲ) complexes containing completely or partially conjugated macrocyclic ligands were measured in various solvents to investigate the solvent effect on the charge transfer band for the axial cobalt-carbon bond by the extent of conjugation in the equatorial macrocyclic ring; completely conjugated, $CH_3CoL,\;C_6H_5CoL,\;CNCoL,\;CH_3CoL',\;CNCoL'$, partially conjugated $CH_3(py)Co(DH)_2, CH_3CoL"$, unconjugated dienes, $[CH_3Co(1,4-CT)](ClO_4)_2$, and open ring, $CH_3Co(salen)$. The position of the charge transfer band which corresponds to the cobalt-carbon bond was shifted to a shorter wavelength as the polarity of solvent increased and the transition energy $(E_T)$ had a linear relationship with solvent polarity parameter, Z-value, only in the case of completely conjugated system. However, the linear correlation between $E_T$and Z was not observed for partially conjugated and open ring systems.
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20대 여성의 뷰티 동영상 관심도가 화장품 구매의도 및 구매행동에 미치는 영향
서혜경 ( Hye-kyeong Seo ),김선형 ( Sun-hyoung Kim ) 한국미용학회 2021 한국미용학회지 Vol.27 No.2
This study attempted to investigate the influence of cosmetology videos on cosmetics purchase intention and behavior among young women in their 20s, and the results found the following: The rise of interest in cosmetology videos had a positive effect on cosmetics purchase intention and behavior, and the influence was higher as the respondents were younger/more educated and their cosmetics purchase interval became faster. Compared to other women, women in their 20s revealed high cosmetics purchase intentions in pursuit of brand, price consideration, purchase sustainability, and change of pace. Young women tend to reveal their manners and express values through makeup. In general, they love functional cosmetics. In addition, they prefer low-price brands to renowned brands. According to the analysis of correlations between variables, a positive influence was found in the following with statistical significance: interest in cosmetology videos and cosmetics purchase intention, interest in cosmetology videos and cosmetics purchase behavior, cosmetics purchase intention and cosmetics purchase behavior.
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서혜경 ( Heo-kyeong Seo ),김연주 ( Yeon-ju Kim ),이설현 ( Seol-hyeon Lee ),김선형 ( Sun-hyoung Kim ) 한국미용학회 2021 한국미용학회지 Vol.27 No.1
This study attempted to investigate the possibility and effectiveness of virtual reality (VR)-based makeup education by examining the perception of VR by college women who are majoring in cosmetology and empirically analyze the influence of VR-based beauty contents on makeup courses. The goal is to suggest the possibility of convergence in education by finding the best way to apply VR-based beauty contents to makeup courses, and the results found the followings: The respondents’ perception of VR and the application of VR contents to makeup courses was higher after the application of the new technology, which means that students are familiar with advanced information communication technologies. It is also anticipated that VR content would have a positive effect on cosmetology courses which require segmentation and specialization. As the perception of VR improved, the respondents have become more aware of the application of VR-based beauty content to makeup courses. Therefore, effects on makeup education due to VR content are expected. It appears that there should be further studies on the development and application of various VR-based beauty content and educational programs.
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미용 전공 청소년의 뷰티 동영상 관심도가 화장품 구매의도 및 구매행동에 미치는 영향
서혜경 ( Hye-kyeong Seo ),최은미 ( Eun-mi Choi ),김선형 ( Sun-hyoung Kim ) 한국미용학회 2020 한국미용학회지 Vol.26 No.5
This study was conducted to investigate the effects on cosmetics purchase intention and purchasing behavior. As a result of the study, in the teenager group, girls were more interested in beauty videos than boys, the higher the grade, the shorter the purchase cycle of cosmetics, the interest in cosmetics was high. Teenagers with high purchasing costs for cosmetics showed higher brand intention, brand consideration, purchase continuity, and mood change, and cosmetics purchase intention than other teenagers. The higher the grade, in case of makeup, nail and hair beauty, and other majors, the shorter the purchase cycle of cosmetics and the higher the purchase cost of cosmetics, due to the increased socio-cultural attitude toward appearance and a time sensitive to fashion, the cosmetics purchasing behavior had a positive effect on solving the desire for appearance. As a result of analyzing the correlation between variables, it was found that it had a statistically significant positive effect on beauty video interest and cosmetics purchase intention, beauty video interest and cosmetics purchasing behavior, cosmetics purchase intention and cosmetic purchasing behavior.
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서혜경(Seo Hye Kyoung),김유미(Kim You Me) 학습자중심교과교육학회 2012 학습자중심교과교육연구 Vol.12 No.1
본 연구의 목적은 초등학생의 자기주도 학습능력의 신장을 위한 PBL 기반 자기주 도 학습 프로그램을 개발하고 그 효과를 검증하는 데 있다. 먼저 프로그램 개발을 위 해 체제적 프로그램 개발 모형에 따라 초등학교 4학년 학생 50명을 대상으로 요구조사 를 실시하고, 과제 및 대상 분석을 실시한 후, 프로그램 설계 준거 및 동기 전략에 따 라 프로그램 지침서를 개발하였다. 자기주도학습 능력 변화를 알아보기 위해 자기주도학습 능력 검사지를 이용하여 사 전 검사를 실시한 뒤, 초등학교 4학년 학생 25명은 실험집단에, 25명은 비교집단에 배 정하고, 14회기 동안 실험집단에 PBL 기반 자기주도 학습 프로그램을 적용한 후, 사후 검를 실시하였다. 또한 영역별 활동마다 학생들의 소감문을 분석하고 교사의 관찰 내 용을 기록하였다. 효과 검증을 위한 t검증 결과, 비교집단에 비해 실험집단의 자기주도 학습능력 점수가 유의미하게 높았다. 이는 본 연구에서 개발한 PBL 기반 자기주도 학 습 프로그램이 초등학생의 자기주도 학습능력 신장에 효과적임을 시사한다. The purpose of this research is to develop a PBL based self-directed learning program for improving children s self-directed learning ability and to verify the program s effectiveness developed according to the systematic program developing model. Task and target population analysis were conducted and then need analysis was also conducted at fifty 4th graders in an elementary school. Based on these analyses, the research s program and program guide were developed. In verifying the effectiveness of the program, 25 children participated in the program while other 25 children were placed in control group. The self-directed learning ability scale(Cronbach s α = 0.90) was administered for this program evaluation. The experimental group participated in 14 sessions of a PBL based self-directed learning program during7 weeks to improve the 4th graders s self-directed learning ability. After appling this program, the experimental group were higher than the control group in the self-directed learning ability and its sub-factors, that is, motivation, cognition, and behavior regulation s ability.
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