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Flexible high-energy Li-ion batteries with fast-charging capability.
Park, Mi-Hee,Noh, Mijung,Lee, Sanghan,Ko, Minseong,Chae, Sujong,Sim, Soojin,Choi, Sinho,Kim, Hyejung,Nam, Haisol,Park, Soojin,Cho, Jaephil American Chemical Society 2014 NANO LETTERS Vol.14 No.7
<P>With the development of flexible mobile devices, flexible Li-ion batteries have naturally received much attention. Previously, all reported flexible components have had shortcomings related to power and energy performance. In this research, in order to overcome these problems while maintaining the flexibility, honeycomb-patterned Cu and Al materials were used as current collectors to achieve maximum adhesion in the electrodes. In addition, to increase the energy and power multishelled LiNi0.75Co0.11Mn0.14O2 particles consisting of nanoscale V2O5 and LixV2O5 coating layers and a LiδNi0.75-zCo0.11Mn0.14VzO2 doping layer were used as the cathode-anode composite (denoted as PNG-AES) consisting of amorphous Si nanoparticles (<20 nm) loaded on expanded graphite (10 wt %) and natural graphite (85 wt %). Li-ion cells with these three elements (cathode, anode, and current collector) exhibited excellent power and energy performance along with stable cycling stability up to 200 cycles in an in situ bending test.</P>
Study on the Curriculum of Korean Optometrist Training Institutes
Mijung Park,Jae-Myoung Seo 대한시과학회 2017 대한시과학회지 Vol.19 No.4
목적: 전국의 대학 교육과정과 교과목의 중요도를 비교 분석하고 현장에서 이루어지는 현장실습 관련 실 태를 파악하여 한국 안경광학과의 교육과정의 현 주소를 짚어보고자 한다. 방법: 설문지는 안경광학과가 개설되어 있는 4년제 15개, 3년제 28개, 2년제 2개 대학 모두 45개 대학 그리고 전국의 각 지역별 현장의 안경사 522명을 대상으로 2016년 6월부터 7월까지 대면 및 우편을 통하여 배포 및 실시하였다. 설문항목은 각 대학에서 개설된 교과목명과 그에 대한 중요도, 현장실습 교과목 운영 방식에 주안점을 두어 작성했다. 결과: 전국의 안경광학과에서 개설되어 있는 교과목의 중요도 지수는 시광학이론 과목이 4.1, 시광학응 용/실무 과목이 7.1로 나타나 시광학이론 과목 : 시광학응용/실무 과목의 비율은 1 : 1.7의 비율로 나타났다. 3년 또는 4년 과정으로 학제가 이루어진 대부분의 대학의 임상실습 교과에서 평균 270시간 정도의 실습을 하는 것으로 나타났다. 결론: 현장중심 교육의 확대와 졸업 후 갖추어야 할 능력배양을 강하게 요구하는 사회적 요구와 더불어 최근 빠르게 변화하는 산업적 변화에 따른 직업적 지각 변동을 고려하여 미래 안경사에 적합한 학제와 교육 과정 구조를 개발해야 할 것으로 생각된다. Purpose: This study aimed to investigate the current state of Optometry program in Korea by analyzing the relative importance of curriculum and the clinical practice. Methods: A self-reported questionnaire was administered at the 45 Optician training institutes (2 two-year colleges, 28 three-year colleges, 15 four-year Universities) and by 522 clinical Opticians all across the country from June to July 2016. It consists of the subjects entitled by each institutes, their important rate and the way to operation method. Results: The quotients of importance in terms of the theory and the application of vision science were 4.1 and 7.1, respectively. The ratio of the theory to the application of vision science was at 1.7. The subject entitled clinical practice was taught in institutes except for two-year college for about 270 hours in average. Conclusions: Considering the extension of field center education, the social needs for the better qualification from graduate and the recent industrial evolution, it needs to develop the new structure of curriculum for future Optician.
Mijung Park,Ji Um,So Hyun Kim,Jiseon Yoon,Yeonjae Lee,Jiyeong Kwon,Seonhee Baek,Dong Yeon Kim 한국아동간호학회 2023 Child Health Nursing Research Vol.29 No.1
Purpose: This study investigated correlations between the actual sleep time 24 hours prior to an examination and the time to achieve chloral hydrate sedation in pediatric patients. Methods: With parental consent, 84 children who were placed under moderate or deep sedation with chloral hydrate for examinations from November 19, 2020 to July 9, 2022 were recruited. Results: Patients' average age was 19.9 months. Pediatric neurology patients and those who underwent electroencephalography took significantly longer to achieve sedation with chloral hydrate. There was a negative correlation between the time to achieve sedation and actual sleep time within 24 hours prior to the examination. Positive correlations were found between the actual sleep time 24 hoursprior to the examination and the second dose per weight, as well as between the sedation recovery time and awake hours before the examination. Conclusion: Sleep restriction is not an effective adjuvant therapy for chloral hydrate sedation in children, and sedation effects vary according to pediatric patients' characteristics. Therefore, it would be possible to reduce the unnecessary efforts of caregivers who restrict children's sleep for examinations. It is more important to educate parents about safe sedation than about sleep restriction.
Mercury Ion Monitoring in Mercury Plating Bath by Anodic Stripping Voltammetry
Park, Mijung,Yoon, Sumi,Shin, Woonsup The Korean Electrochemical Society 2016 Journal of electrochemical science and technology Vol.7 No.3
Anodic stripping voltammetry (ASV) is successfully applied in mM level detection of mercury ion in an electroplating bath which is currently used in preparing a cathodic electrolyzer. Glassy carbon electrode is used for the detection and the optimum condition obtained is 10 s deposition at −1.4 V vs. Ag/AgCl and stripping by scanning from −1.4 to +0.4 V vs Ag/AgCl at 50 mV/s. By applying the method, the mercury ion concentration in the electroplating bath could be successfully monitored during the plating.
박미정 ( Mijung Park ),안치현 ( Chi-hyun Ahn ),우종정 ( Jongjung Woo ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.1
국내에서 통신 산업과 게임 산업은 다른 기술 산업 분야에 비해 급격하게 성장 하였으며, 현재 국내 산업 분야에서 큰 부분을 차지하고 있다. 통신과 게임 산업의 성장은 교육 분야에 새로운 학습 컨텐츠를 요구하고 있다. 그에 따라 모바일 기기를 이용한 컨텐츠 개발이 이루어 졌으나 통신비용이 높고 학습자의 흥미유발을 고려하지 않았다. 따라서 본 논문은 소켓 통신을 사용하여 요금을 절감하고, 학습자가 흥미롭게 학습 할 수 있도록 에듀테인먼트 요소를 적용한 휴대폰 기기용 학습 컨텐츠를 제안한다.