A Comparative Study on the Efficacy of Zea mays L. Extracts as a Natural Ingredient in Cosmetics

권혜진,Kwon, Hye-Jin The Society of Digital Policy and Management 2018 디지털융복합연구 Vol.16 No.9

In this study, Zea mays L., which were discarded after harvesting in Korea, were collected and used for experiment. The Zea mays L. were dried in the shade and ground before being extracted using two solvents. Subsequently, DPPH, ABTS, the total flavonoid content and the total polyphenol content were measured to analyze antioxidant activity. The diameter of clear zone was measured by using the paper disc diffusion method. The results showed that the ethanol extract had a slightly higher antioxidant and antibacterial activity. The total polyphenol content was measured using gallic acid as standard, and CE(ethanol extract) was found to contain $31.2{\pm}5.2mg\;GAE/g$ of polyphenols, indicating a considerably high activity. When DPPH radical scavenging ability was measured, CE was found to have $4.6{\pm}0.9%$, $6.4{\pm}0.5%$, $22.9{\pm}0.6%$ and $83.2{\pm}0.2%$ at different concentrations of $1{\mu}g/mL$, $10{\mu}g/mL$, $100{\mu}g/mL$, and $1,000{\mu}g/mL$, respectively, with a dependent tendency at the concentration of $1,000{\mu}g/mL$ and a considerably high activity at the concentration of $1,000{\mu}g/mL$. This study is expected to be used as preliminary data to develop new natural antioxidant, antibacteria raw materials, as only little research has been undertaken on Zea mays L., which are mostly discarded after harvesting, while many studies have been so far conducted on corn and corn silks. 국내에서 재배되는 옥수수의 수확 후 버려지는 잎을 수거하여 음건하고 분쇄 한 후 실험에 사용하였다. 두 가지 용매로 추출 후 DPPH, ABTS, 총 플라보노이드 함량, 총 폴리페놀 함량을 측정하여 항산화 활성을 분석하고, Paper disc diffusion method 로 clear zone의 직경을 측정 하였다. 그 결과 에탄올 추출물이 모든 항산화활성과 항균활성에서 다소 높은 결과를 나타내었다. Gallic acid를 표준물질로 하여 총 polyphenol 함량을 측정한 결과 CE는 $31.2{\pm}5.2mg\;GAE/g$로 높은 활성을 보였고, DPPH radical 소거능 측정 결과 CE는 1, 10, 100, 1,000 (${\mu}g/mL$) 농도에서 각각 $4.6{\pm}0.9%$, $6.4{\pm}0.5%$, $22.9{\pm}0.6%$, $83.2{\pm}0.2%$로 나타나 농도 의존적 경향을 보였으며 1,000 (${\mu}g/mL$)에서는 매우 높은 활성을 보였다. 지금까지 옥수수와 옥수수 수염에 대한 연구는 많지만 페기 되는 잎에 대한 연구는 없어 본 연구가 새로운 천연 항산화, 항균 효능을 가진 원료개발의 기초 자료가 될 것으로 판단된다.

감광성 CNT 페이스트를 이용한 IED 폭발물 제거로봇 탐지전극 형성에 관한 연구

권혜진,Kwon, Hye Jin 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.4

In this study, two important requirements for the home production of a robot to detect and remove improvised explosive devices (IEDs) are presented in terms of the total cost for robot system development and the performance improvement of the mine detection technology. Firstly, cost analyses were performed in order to provide a reasonable solution following an engineering estimate method. As a result, the total cost for a mass production system without the mine detection system was estimated to be approximately 396 million won. For the case including the mine detection system, the total cost was estimated to be approximately 411 million won, in which labor costs and overhead charges were slightly increased and the material costs for the mine detection system were negligible. Secondly, a method for fabricating the carbon nanotube (CNT) based gas detection sensor was studied. The detection electrodes were formed by a photolithography process using a photosensitive CNT paste. As a result, this method was shown to be a scalable and expandable technology for producing excellent mine detection sensors. In particular, it was found that surface treatments by using adhesive taping or ion beam bombardment methods are effective for exposing the CNTs to the ambient air environment. Fowler-Nordheim (F-N) plots were obtained from the electron-emission characteristics of the surface treated CNT paste. The F-N plot suggests that sufficient electrons are available for transport between CNT surfaces and chemical molecules, which will make an effective chemiresistive sensor for the advanced IED detection system.

유아에게 적절한 그림책에 대한 유아교사의 담론 탐색

권혜진 ( Hyejin Kwon ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.6

본 연구는 유아에게 적절한 그림책에 대해 유아교사들이 형성하고 있는 담론을 탐색하고자 하였다. 이를 위하여 10명의 유아교사를 대상으로 총 14회의 면담을 실시하였고 면담 내용은 녹음 후 전사하였다. 수집자료는 범주화하여 질적분석을 실시하였다. 연구결과 유아교사들은 유아에게 적절한 그림책으로 다양한 가족의 모습과 문제를 담은 책, 유아의 삶을 투영하고 극복을 보여주는 책, 유아들이 타인과 문화를 넓게 이해할 수 있는 책이 적절하다는 인식을 보였다. 본 연구결과를 토대로 향후 그림책에 대한 유아 문해 활동과 독자 반응 연구가 수행되기를 기대한다. The purpose of the study is to explore the discourses of early childhood teachers on the picture books appropriated for young children. For this, interviews were conducted with 12 early childhood teachers. Interviews were recorded and the recordings were transcribed. Qualitative analysis was conducted based on the collected data. As a result of the study, early childhood teachers showed the recognition that books containing various family figures and problems, books that project and overcome children’s lives, and books that allow children to comprehensively understand other people and cultures are appropriate as picture books suitable for young children. Based on the results and discussion of this study, It is expected that children’s literacy activities and reader response studies on picture books will be conducted in the future.

보육교사의 직무스트레스가 이직의도 및 전직의도에 미치는 영향과 개인적 성취감의 조절효과

권혜진(Kwon Hye Jin) 한국지역사회생활과학회 2008 한국지역사회생활과학회지 Vol.19 No.4

느타리버섯 포자와 균사체의 양성자 빔 조사에 대한 민감도

권혜진 ( Hye Jin Kwon ),공원식 ( Won Sik Kong ) 한국균학회 2006 韓國菌學會誌 Vol.34 No.1

권두언

권혜진 ( Kwon Hye Jin ) 한국정신간호학회 2002 정신간호학회지 Vol.11 No.1

LDA 기반 토픽 모델링과 이원모드 네트워크 분석을 활용한 ‘Culinary Science & Hospitality Research’ 연구추이동향 분석

권혜진(Hye-Jin Kwon),김학선(Hak-Seon Kim) 한국조리학회 2021 한국조리학회지 Vol.27 No.6

경로당 시설에 대한 체크리스트 개발과 평가

권혜진(Kwon, Hye-Jin),신경주(Shin, Kyung-Joo) 한국실내디자인학회 2015 한국실내디자인학회논문집 Vol.24 No.4

This research tried identifying the current status of Gyongrodangs to find solutions to the problems of the oldest old through revitalization of the existing senior centers. With 31 national and public Gyungrodangs in Seocho-gu, Seoul as research subjects, the research contents include a survey of the facilities including main exit doors, living rooms and lounges, kitchens, and rest rooms in the Gyungrodangs by the checklist, and as the research tool a laser finder, measuring tapes and cameras were used. The checklist was used as the research method to investigate main exit doors, living rooms and lounges, kitchens, and rest rooms. Based on the research result, the following conclusions are presented. The safety-related items of the public Gyungrodang facilities were reaching a critical level. They need to equip emergency exit routes, install exit lights and alarm bells, and teach how to use them. After that, the issue of rest room would be raised; the oldest old had difficulty in using the rest room with no consideration of universal design(UD), so installation of grab bars is needed around toilets, washstands and urinals. Besides them, although absence of the western style furniture without consideration of users` ages caused inconvenience of using, there are no solutions due to the limited space. Unnecessary equipment such as treadmills which only occupy spaces without users should be thrown away and replaced with the furniture people would use like tables with supplement of furnitures to lie down and rest. Overall, the current Gyongrodang Facilities lack systems and need standardized management, in which the checklist this researcher developed and used in evaluating the present conditions could be recommended. It is expected that the evaluation system of senior centers would be arranged through this checklist, so that systematic service supply could be possible in the better facility environment.

소비자의 자율성에 관한 이론탐색적 연구

권혜진 ( Hye Jin Kwon ),이기춘 ( Kee Choon Rhee ) 한국소비자학회 2006 소비자학연구 Vol.17 No.3

인터랙션디자인으로 계획한 패션전문점 내 여성의류매장

권혜진(Kwon, Hye-Jin),신경주(Shin, Kyung-Joo) 한국실내디자인학회 2010 한국실내디자인학회 학술대회논문집 Vol.12 No.1

Specialized fashion shopping centers started having their own differentiated features by being compared with home shopping and online companies in keen competition. Because of their merit in the side of price, as ‘+α’, specialized fashion shopping centers made a huge fashion town differing from Myeongdong, the entrance of Ewha Womans University and Apgujeongdong. Social demand for sale facilities by an increase in leisure and cultural activities has been expanded and, also in commercial space, changes are being demanded. With ‘FUN’ and ‘UNIQUE’ which are elements to attract young people, specialized fashion shopping centers such as ‘Shimo-Kitazawa’is being changed to a multicultural space where young generations can visit at all times. As you can see in changes of fashion distribution environment, examining consumers’changes in purchase environment, consumers after 2000 are polarized and have diverse desire for goods purchase by combining online with offline, reasonable consumption with emotional consumption and luxury with pragmatism. However, currently clothes stores of more than 90% within specialized fashion shopping centers still form their stores in a way of emphasizing only simple display. In modern society, consumption plays a role as a kind of symbol as well as of buying goods simple. Space has an effect on all senses including sight. Therefore, when space experience is completed, we are moved by space through synthesized images. By communicating with customers and inducing total experience from customers, formation of sympathy makes a foundation to be connected with customers’desire for purchase. Namely, stores making customers use physical elements the most easily and conveniently and satisfying customers with them when customers visit the stores will be chosen from customers by making goods stood out among stores selling similar goods. Kang Sung-Joong and Kwon Young-Geol argued that interaction design in space depended on, first, how much use and function of space had an effect on users efficiently, second, how much information required to customers’use of space was delivered to customers efficiently and, finally, not causing problems in use of physical elements forming space. Therefore, I will design two stores planned to be an interactionspace design to satisfy an increase in sale and facilitation of consumption in the side of sellers and emotion and shopping convenience in the side of consumers.