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RISS 인기검색어
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- 저자 : 이하영 ( Ha Young Lee ) (검색결과 123 건)
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습식 화학적 식각 방법에 의한 시간에 따른 GaAs(100) 단결정 웨이퍼에서의 마이크로 구멍의 제작 및 분석
이하영,곽민섭,임경원,안형수,이삼녕,Lee, Ha Young,Kwak, Min Sub,Lim, Kyung-Won,Ahn, Hyung Soo,Yi, Sam Nyung 한국재료학회 2019 한국재료학회지 Vol.29 No.3
Surface plasmon resonance is the resonant oscillation of conduction electrons at the interface between negative and positive permittivity material stimulated by incident light. In particular, when light transmits through the metallic microhole structures, it shows an increased intensity of light. Thus, it is used to increase the efficiency of devices such as LEDs, solar cells, and sensors. There are various methods to make micro-hole structures. In this experiment, micro holes are formed using a wet chemical etching method, which is inexpensive and can be mass processed. The shape of the holes depends on crystal facets, temperature, the concentration of the etchant solution, and etching time. We select a GaAs(100) single crystal wafer in this experiment and satisfactory results are obtained under the ratio of etchant solution with $H_2SO_4:H_2O_2:H_2O=1:5:5$. The morphology of micro holes according to the temperature and time is observed using field emission - scanning electron microscopy (FE-SEM). The etching mechanism at the corners and sidewalls is explained through the configuration of atoms.
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이하영 ( Ha Young Lee ),이형환 ( Hyung H. Lee ),천준협 ( Jun Hyup Chun ) 한국자연치유학회 2017 Journal of Naturopathy Vol.6 No.1-2
This study aims to investigate the effect of the praise therapy program on the self-esteem of the general public. In terms of sex, the self-esteem after the praise therapy was much more improved in the female (24.6%) than in the male (14.78%), and the average of the male and female was 21.33%; In terms of ages, the improvement rate was in the order of 30s (28.34%) > 40s > 20s > 10s > 60s > 50s (16.89s), which showed that the younger the group was, the higher the improvement rate was. And, the comprehensive average of improvement rate was 26.6%. The unmarried (22.77%) was much more improved than the married (19.83%). The high school graduate (22.58%) was improved than the college graduate or higher (20.48%), and the total average was increased by 21.33% after treatment. All of the above items were statistically significant between and within the pre-treatment group and post-treatment group, and there was no difference depending on sex, age, and education level. Because the praise therapy program carried out in this study has significantly improved the self-esteem, it is concluded that this program can be an excellent natural healing therapy for improving the self-esteem of the general public.
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이하영 ( Ha Young Lee ),이형환 ( Hyung H. Lee ),천준협 ( Jun Hyup Chun ) 한국자연치유학회 2017 Journal of Naturopathy Vol.6 No.1-2
This study aims to investigate the effect of the praise therapy program on the happiness of the 94 general public. In terms of sex, the happiness after the praise therapy was much more improved in the male (23.75%) than in the female (21.9%), and the average of the male and female was 35.6%; In terms of ages, the improvement rate was in the order of 30s (29.27%) > 20s > 40s > 10s > 60s > 50s (15.5%), which showed that the younger the group was, the higher the improvement rate was, and the total average improving rate was 33%. The unmarried (25.32%) was much more improved than the married (19.5%), and the comprehensive average improving rate was 22.5%. The high school graduate (23.25%) was improved than the college graduate or higher (22%), and the total average improving value was increased by 22.5% after treatment. All of the above items were statistically significant between and within the pretreatment group and post-treatment group, and there was no difference depending on sex, age, and education level. Because the praise therapy program carried out in this study has significantly improved the happiness, it is concluded that this program can be an excellent natural healing therapy for improving the happiness of the general public.
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