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2차 공기 주입각이 소각로 내부의 온도 분포 균일도에 미치는 영향
김성준(S. J. Kim),민인홍(I. H. Min),박명호(M. H. Park),박민주(M. J. Park) 한국전산유체공학회 2000 한국전산유체공학회지 Vol.5 No.3
This research is aimed to find out how the inlet angle of secondary air affects the uniformity of temperature distribution inside a small incinerator. A commercial code, PHOENICS, is used to simulate the thermal-flow field of an incinerator. The computational grid system is constructed by Multi-Block technique provided by PHOENICS. Numerical experiments are done with the five different angles of secondary air inlet. The uniformity of temperature distribution is evaluated by checking the standard deviation of temperature distribution in an incinerator. The computational results show that there is the minimum value of standard deviation at the certain angle of secondary air inlet, which means that there is an optimum angle of secondary air inlet that could improve the uniformity of temperature distribution in an incinerator. The optimum angle of secondary air inlet is between 30 degree and 45 degree in this particular case.
1×1 mm<sup>2</sup> 대면적 녹색 LED의 전기 광학적 특성 분석
장이운,조동섭,전주원,안태영,박민주,안병준,송정훈,곽준섭,김진수,이인환,안행근,Jang, L.W.,Jo, D.S.,Jeon, J.W.,Ahn, Tae-Young,Park, M.J.,Ahn, B.J.,Song, J.H.,Kwak, J.S.,Kim, Jin-Soo,Lee, I.H.,Ahn, H.K. 한국진공학회 2011 Applied Science and Convergence Technology Vol.20 No.4
본 논문은 InGaN/GaN 다중양자우물 구조를 가지는 녹색 발광다이오드의 활성층 내 인듐(In) 조성비와 piezoelectric field에 대한 전계 흡수 현상을 연구하였다. 활성층 내 결정학적 성질과 In 조성비는 double crystal X-ray diffraction 측정으로 분석하였으며, $1{\times}1\;mm^2$ 대면적 칩을 제작하여 발광특성을 조사하였다. 또한, 활성층 내 piezoelectric field는 electro-reflectance spectroscopy로부터 측정한 compensation voltage를 이용해 계산하였고, 인가전압에 따른 photocurrent의 변화를 측정함으로써 녹색 발광 소자의 전기 광학적 특성을 분석하였다. We investigated the effects of piezoelectric field on the electro-absorption characteristics in InGaN/GaN multiple-quantum well (MQW) green light emitting diodes (LED). Double crystal X-ray diffraction measurement was performed to study the crystalline property and indium (In) composition in the MQW active layer. To measure the electro-luminescence and electro-reflectance (ER) spectroscopy, we fabricated the $1{\times}1\;mm^2$ large-area green LED chip. The piezoelectric field inside the LED structure was evaluated from the Vcomp in active layer by the ER spectra. Finally, we analyzed the electro-absorption characteristics of the green LED by using the photo-current spectroscopy.
1×1 ㎟ 대면적 녹색 LED의 전기 광학적 특성 분석
장이운(L. W. Jang),조동섭(D. S. Jo),전주원(J. W. Jeon),안태영(Tae-Young Ahn),박민주(M. J. Park),안병준(B. J. Ahn),송정훈(J. H. Song),곽준섭(J. S. Kwak),김진수(Jin-Soo Kim),이인환(I. -H. Lee),안행근(H. K. Ahn) 한국진공학회(ASCT) 2011 Applied Science and Convergence Technology Vol.20 No.4
본 논문은 InGaN/GaN 다중양자우물 구조를 가지는 녹색 발광다이오드의 활성층 내 인듐(In) 조성비와 piezoelectric field에 대한 전계 흡수 현상을 연구하였다. 활성층 내 결정학적 성질과 In 조성비는 double crystal X-ray diffraction 측정으로 분석하였으며, 1×1 ㎟ 대면적 칩을 제작하여 발광특성을 조사하였다. 또한, 활성층 내 piezoelectric field는 electro-reflectance spectroscopy로부터 측정한 compensation voltage를 이용해 계산하였고, 인가전압에 따른 photocurrent의 변화를 측정함으로써 녹색 발광 소자의 전기 광학적 특성을 분석하였다. We investigated the effects of piezoelectric field on the electro-absorption characteristics in InGaN/GaN multiple-quantum well (MQW) green light emitting diodes (LED). Double crystal X-ray diffraction measurement was performed to study the crystalline property and indium (In) composition in the MQW active layer. To measure the electro-luminescence and electro-reflectance (ER) spectroscopy, we fabricated the 1×1 ㎟ large-area green LED chip. The piezoelectric field inside the LED structure was evaluated from the Vcomp in active layer by the ER spectra. Finally, we analyzed the electro-absorption characteristics of the green LED by using the photo-current spectroscopy.
남녀 대학생의 신체만족도, 자아존중감과 우울에 대한 비교연구
김나영,김민정,김진경,박민주,박민지,이다솜,이민경,이지영,전양지,정하은 이화여자대학교 간호과학대학 2010 이화간호학회지 Vol.- No.44
The purpose of this study was to know relationship among body image and self esteem, depression obtained from male and female. Also we wanted to know what is differences between male and female groups. We intended to provide basis materials for developing programs to increase body image, self esteem and to decrease depression at the same time. Object of our study were male and female who are in collage. There were 90 people in each group. We used frequency analysis to know general characteristics, and we use frequency analysis and descriptive statistic analysis to know question distribution. We studied relationship among body image and self esteem and depression with using Spearman Correlation and analysised the differences between male and female groups with using T-test. This is the result of our research. 1. ale show higher BCS and BET scores than women. Between male and female, self-esteem have no big differences. And female is more depressive than male. 2. he two elements that body image and depression are in inverse proportion to each other in both male and female university students. 3. The two elements that self-esteem and depression are in inverse proportion to each other in both male and female university students. 4. The two elements that body image and self-esteem are in inverse proportion to each other in both male and female university students. And male have high correlation between BCS and BET, BCS and self-esteem, self-esteem and depression tha female. On the other hand, female have high correlation between BET and self-esteem, BET and depression In short, both male and female have correlation between body image, self-esteem and depression. Especially, between self-esteem snd depression have high correlation. In body image, especially female have high correlation between BET and depression. Finally we found the fact that female is more sensitively react than male about appearance.