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페로브스카이트 태양전지 상용화를 위한 자외선 및 수분 안정성 향상 전략
황은혜(Eunhye Hwang),권태혁(Tae-Hyuk Kwon) 한국태양광발전학회 2022 Current Photovoltaic Research Vol.10 No.2
With rapid growth in light-harvesting efficiency from 3.8 to 25.8%, organic-inorganic hybrid perovskite solar cells (PSCs) have attracted great attention as promising photovoltaic devices. However, despite of their outstanding performance, the commercialization of PSCs has been suffered from severe stability issues, especially for UV and humidity: (i) UV irradiation towards PSCs is able to lead UV-induced decomposition of perovskite films or catalytic reactions of charge-transporting layers, and (ii) exposure to surrounding humidity causes irreversible hydration of perovskite layers by the penetration of water molecules, resulting considerable decrease in their power-conversion efficiency (PCE). This review investigates current status of strategies to enhance UV and humidity stability of PSCs in terms of UV-management and moisture protection, respectively. Furthermore, the multifunctional approach to increase long-term stability as well as performance is discussed as advanced research directions for the commercialization of PSCs.
황은혜 ( Eun-hye Hwang ),박은준 ( Eun-jun Pack ) 한국미용학회 2017 한국미용학회지 Vol.23 No.1
This study was carried out to know the effect of stress types of hair industry Employee based on the feeling center of Enneargram personality types on stress and coping strategies. The present study will suggest basic data for minimizing the stress and maximizing the efficiency. Firstly, the effect of job stress based on the feeling center of Enneargram on stress has partly significant result in all stress. Above all, the higher level of dissatisfaction of working expectancy leads to the higher chronic fatigue of stress, which has the highest power of explanation. Secondly, influence of job stress based on the feeling center of Enneargram on coping strategies of stress has partly significant result in all of the coping strategies, except hoping management. Above all, the higher level of dissatisfaction of expectation of work rather than dissatisfaction of responsibility avoidance of job stress leads to the tendency of the defensive management strategy. In conclusion, the higher level of dissatisfaction of expectation of work of hair industry Employee based on the feeling center of Enneargram personality types is likely lead to the higher level of stress.
한국 다국적기업 해외자회사의 현지화 수준과 경영성과 - 산업별ㆍ국가별 성과요인 비교 분석
황은혜 ( Hwang Eunhye ),김동환 ( Kim Donghwan ),이홍식 ( Lee Hongshik ) 국제지역학회 2016 국제지역연구 Vol.20 No.3
본 논문은 한국 다국적 기업의 자료를 이용하여 해외직접투자에서 현지화가 자회사의 경영성과에 미치는 영향을 분석하고자 한다. 이를 위해 한국수출입은행에서 제공하는 61개 국가에 진출해있는 2,116개 한국 다국적기업의 현지자회사에 대한 2008년에서 2011년까지의 자료를 사용하고 있다. 고정효과 패널선형모형을 사용해 분석한 결과 현지화가 자회사의 경영성과에 미치는 영향은 산업별, 국가그룹별로 매우 상이하게 나타났다. 제조업의 경우 현지매출비중의 증가는 중국에 진출해 있는 현지자회사의 경영성과에만 긍정적인 영향을 미치는 반면, 현지매입비중의 증가는 중국을 제외한 기타 개도국에서만 유의하게 정(+)의 영향을 나타내는 것으로 분석되었다. 반면, 서비스업의 경우 해당 투자대상국이 선진국일 경우 현지매출비중, 현지매입비중, 현지관리자비중 모두 긍정적인 영향을 미치며, 중국의 자회사에 대해서는 현지매출비중만이 긍정적인 영향을 미치는 것으로 나타났다. In this study we analyze the performance of overseas subsidiaries of Korean multinationals with localization in sales, purchase, and employment. We use the data of 2,116 overseas subsidiaries in 61 countries between 2008 and 2011 provided by The Export-Inport Bank of Korea. As a result, analysis shows that the effect of localization on the performance is quite different by sectors and countries which the subsidiaries have entered. In the manufacturing sector, increase of local sales has positive effect only in China, while local purchase improves the performance of the subsidiaries in developing counties excluding China. However, the subsidiaries which had made a foray to service sector in advanced countries aquired better performance with localization of sales, purchase, and employment, whereas those in China had no merit except localization of purchase.
미용종사자의 의사소통유형, 고객서비스지향성, 사회적 행동의 구조적관계
황은혜(Eun-Hye Hwang),박은준(Eun-Jun Pack) 한국인체미용예술학회 2021 한국인체미용예술학회지 Vol.22 No.3
Modern society is making great efforts to increase its competitiveness according to differentiated communication and service orientation of consumers. In particular, salons are aiming for high-quality services due to financial consumption and personal time investment. The increase in income due to economic development has increased people s desire and level of culture, and if they are satisfied with communication, they will be strengthened further, which helps them secure customers in the long run by playing a role in suppressing conversion behavior. The more a customer perceives that the results they receive are less than what they pay, the less flexibility they have in the process or process of service delivery, or the less human they think the service contact staff is in the process of providing the service, the more unpleasant they are to the service company. Therefore, it is said that differentiated communication approaches are needed for customers with different tendencies, customized services are needed, and that better communication quality and service can be improved while marketing, thereby improving satisfaction according to preferred communication type and service orientation, and increasing sales. We hope that this study will be used as a basic data in the future, which will have a positive impact on the marketing strategies of beauty workers.
중성의 염화물 환경 내 자동차용 초고강도강의 부식반응에 기인한 수소원자의 발생 및 투과 메커니즘
황은혜,류승민,김성진,Hwang, Eun Hye,Ryu, Seung Min,Kim, Sung Jin 한국재료학회 2018 한국재료학회지 Vol.28 No.7
Hydrogen evolution on a steel surface and subsequent hydrogen diffusion into the steel matrix are evaluated using an electrochemical permeation test with no applied cathodic current on the hydrogen charging side. In particular, cyclic operation in the permeation test is also conducted to clarify the corrosion-induced hydrogen evolution behavior. In contrast to the conventional perception that the cathodic reduction reaction on the steel in neutral aqueous environments is an oxygen reduction reaction, this study demonstrates that atomic hydrogen may be generated on the steel surface by the corrosion reaction, even in a neutral environment. Although a much lower permeation current density and significant slower diffusion kinetics of hydrogen are observed compared to the results measured in acidic environments, they contribute to the increase in the embrittlement index. This study suggests that the research on hydrogen embrittlement in ultra-strong steels should be approached from the viewpoint of corrosion reactions on the steel surface and subsequent hydrogen evolution/diffusion behavior.
간문부 담관암과 유사한 원발 담관 점막 연관 림프조직 림프종 1예
황승하 ( Seungha Hwang ),송태준 ( Tae Jun Song ),소설 ( Seol So ),전민경 ( Min Kyung Jeon ),오은혜 ( Eun Hye Oh ),권병수 ( Byoung Soo Kwon ),안수종 ( Sujong An ),김명환 ( Myung Hwan Kim ) 대한소화기학회 2016 대한소화기학회지 Vol.68 No.2
Primary biliary mucosa-associated lymphoid tissue (MALT) lymphoma is extremely rare. We report a case of primary biliary MALT lymphoma with obstructive jaundice diagnosed by endoscopic biopsy, without surgical intervention. Obstructive jaundice was relieved by endoscopic drainage and endoscopic biopsy was done simultaneously during endoscopic retrograde cholangiopancreatography. Unnecessary surgical intervention can be avoided after pathological confirmation of lymphoma. The patient received radiotherapy, and is alive without any evidence of recurrence or biliary obstruction. Diagnosis of primary biliary lymphoma is very difficult because of its low prevalence. However, it should always be considered as a differential diagnosis, since when an accurate diagnosis is made, unnecessary surgical intervention can be avoided. (Korean J Gastroenterol 2016,68:114-118)