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RF 플라즈마에 의해 생성된 산소 플라즈마의 발광 스펙트럼
김도엽,김민수,김태훈,김군식,최현영,조민영,전수민,박성동,김진하,김은도,황도원,임재영,Kim, Do-Yeob,Kim, Min-Su,Kim, Tae-Hoon,Kim, Ghun-Sik,Choi, Hyun-Young,Cho, Min-Young,Jeon, Su-Min,Park, Sung-Dong,Kim, Jin-Ha,Kim, Eun-Do,Hwang, Do-Weon 한국진공학회 2009 Applied Science and Convergence Technology Vol.18 No.2
본 연구에서는 ZnO 박막을 성장하기 위한 plasma-assisted molecular beam epitaxy (PAMBE)에 장착된 플라즈마건에 13.56 MHz의 rf 전력을 인가하였을 때 발생되는 산소 플라즈마의 발광 스펙트럼을 광발광 분광기(optical emission spectroscopy: OES)를 이용하여 조사하였다. 실험은 산소 가스 유량을 1 sccm에서 20 sccm, rf 전력을 25W에서 250 W 범위에서 플라즈마건의 오리피스의 직경을 각각 3 mm 와 5 mm로 달리하여 행해졌다. 산소 플라즈마를 발생시켰을 때 오리피스의 직경에 상관없이 전형적인 산소 플라즈마의 발광 스펙트럼이 관측되었다. 특히 776.8 nm와 843.9 nm에서 $3p^{5}P-3s^{5}S^{0}$, $3p^{3}P-3s^{3}S^{0}$ 천이에 기인하는 강한 산소 원자 발광선이 관측되었다. 산소 유량과 rf 파워가 증가함에 따라 776.8 nm와 843.9 nm의 발광 세기는 증가하였고, 776.8 nm의 스펙트럼 발광 세기의 증가율이 843.9 nm의 스펙트럼 발광 세기 증가율보다 컸다. 또한 오리피스 직경이 3 mm일 때가 5 mm일 때보다 산소 플라즈마가 더 안정적으로 발생하였다. We investigated optical emission of oxygen plasma discharged by 13.56 MHz radio frequency (rf) by using optical emission spectroscopy (OES). Experimental measurement is done at a range of oxygen flow rate of 1$\sim$20 seem, rf power of 25$\sim$250 W, and orifice 3 and 5 mm in diameter. When oxygen plasma was generated, typical emission spectra for oxygen plasma were observed regardless of diameter of orifice. Strong atomic emission lines are observe at 776.8 an 843.9 nm, corresponding to the $3p^{5}P-3s^{5}S^{0}$ and $3p^{3}P-3s^{3}S^{0}$ transitions, respectively. The emission intensity of line at 776.8 and 843.9 nm increased with increasing the oxygen flow rate and rf power. The increasing rate of emission intensity of 776.8 nm line was larger than that of 843.9 nm line. When the diameter of orifice was 3 mm, the oxygen plasma was more stably generated than orifice 5 mm in diameter.
김도엽,Sung-O Kim,김민수,임광국,임재영,김소아람,남기웅,이동율 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.1
The authors used a sol-gel method to deposit Al-doped ZnO (AZO) thin films on Si substrates and a hydrothermal method to grow ZnO crystals on the as-prepared AZO seed layers. Though the crystallinity of the seed layers was enhanced by Al doping, for Al doping up to 3 at.%, the full width at half maximum (FWHM) of the ZnO (002) diffraction peak increased, resulting in a decrease in the average grain size. The intensity of the ZnO (002) diffraction peak of ZnO crystals grown on AZO seed layers increased as the Al doping concentration was increased to 1.0 at.%. The narrowest FWHM in the photoluminescence spectrum, 132 meV was obtained at an Al doping concentration of 1.0 at.%. These results indicate that the structural and the optical properties of ZnO crystals grown on seed layers can be enhanced by introducing a small amount of an Al dopant into the seed layers.
김도엽,이재완,장형진,용부중,Kim, Doyup,Lee, Jaewan,Chang, Hyungjin,Yong, Boojoong 한국자동차안전학회 2011 자동차안전학회지 Vol.3 No.2
Side collisions (or side crash) account for 51.6% of all car to car accidents occurred in 2010. It is necessary to analyze those vehicles' structure deformation and passengers' injuries in the side collisions. A moving barrier (950kg) is currently used in the KNCAP side impact test. However, in order to enhance a passengers' safety in the side collisions, we introduce an AE-MDB (1500kg) which provides more severe conditions for this test. In this study, the test results using both barriers are compared and analyzed.
합성 조건이 분무열분해 공정에 의해 합성되는 Co<sub>3</sub>O<sub>4</sub> 분말의 특성에 미치는 영향
김도엽,주서희,구혜영,홍승권,강윤찬,Kim, Do-Youp,Ju, Seo-Hee,Koo, Hye-Young,Hong, Seung-Kwon,Kang, Yun-Chan 한국재료학회 2006 한국재료학회지 Vol.16 No.1
[ $Co_3O_4$ ] particles with non-aggregation characteristics were prepared by various conditions such as preparation temperature, flow rate of carrier gas, and concentration of spray solution using spray pyrolysis. The morphology and crystallinity of the preformed particles obtained by spray pyrolysis at various conditions affected the mean size and morphology of the post-treated $Co_3O_4$ particles. The preformed particles with hollow and porous morphology obtained from spray solution with citric acid and ethylene glycol turned to $Co_3O_4$ particles with nano size, regular morphology and non-aggregation characteristics after post-treatment at $800^{\circ}C$. On the other hand, the preformed particles obtained by the preparation conditions of short residence time of particles inside hot wall reactor and high reactor temperature turned to $Co_3O_4$ particles with aggregated morphology after post-treatment. The mean crystallite size and particle size of the $Co_3O_4$ particles prepared from optimum preparation conditions were 47 nm and 210 nm at post-treatment temperature of $800^{\circ}C$.
AE-MDB를 이용한 측면충돌안전성 평가시 인체상해 특성에 관한 연구
김도엽(DoYup Kim),장형진(HyungJin Chang),이창석(Changseok Lee),김창현(Changhyun Kim),이재완(JaeWan Lee),김규현(GyunhYun Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The domestic car to car accident Perpendicular to side car crash in a car accident case, the proportion was the highest. Safety regulations and New Car Assessment Program tests to ensure safety in side impacts tend to strengthen regulatory requirements. Side Pole Impact of the road, trees and utility pole, etc. aspects of vehicle side impact crash tests and more intensive deformation and impact energy after the collision mitigation occurs due to a lack of space and will cause fatal injury to the driver. Being studied in this paper AE-MDB side impact test and Side Pole test change the body injury results data analysis and evaluation methods KNCAP hatch side impact applied to the phase comparison should investigate.
김도엽(Do Yeop Kim),장주용(Ju Yong Chang) 한국방송·미디어공학회 2021 한국방송공학회 학술발표대회 논문집 Vol.2021 No.11
3 차원 휴먼 자세 추정 모델은 다시점 모델과 단시점 모델로 분류될 수 있다. 일반적으로 다시점 모델은 단시점 모델에 비하여 뛰어난 자세 추정 성능을 보인다. 단시점 모델의 경우 3 차원 자세 추정 성능의 향상은 많은 양의 학습 데이터를 필요로 한다. 하지만 3 차원 자세에 대한 참값을 획득하는 것은 쉬운 일이 아니다. 이러한 문제를 다루기 위해, 우리는 다시점 모델로부터 다시점 휴먼 자세 데이터에 대한 의사 참값을 생성하고, 이를 단시점 모델의 학습에 활용하는 방법을 제안한다. 또한, 우리는 각각의 다시점 영상으로부터 추정된 자세의 일관성을 고려하는 다시점 일관성 손실함수를 제안하여, 이것이 단시점 모델의 효과적인 학습에 도움을 준다는 것을 보인다.