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건식 열산화로 성장시킨 SiO₂ 박막의 이차전자 방출 특성
정태원(Taewon Jeong),유세기(SeGi Yu),이정희(Jeonghee Lee),진성환(S.H. Jin),허정나(Jungna Heo),이휘건(Whikun Yi),전동렬(D. Jeon),김종민(J.M. Kim) 한국진공학회(ASCT) 2001 Applied Science and Convergence Technology Vol.10 No.1
열산화시킨 SiO₂ 박막의 두께와 입사 전류의 양에 따라 이차전자 방출 계수를 측정하였다. 930℃에서 열산화시킨 SiO₂ 박막 두께는 5.8㎚, 19㎚, 43㎚, 79㎚, 95㎚, 114㎚였으며 이들의 이차전자의 방출 특성이 박막 두께와 전류량에 따라 변화하는 것을 확인하였다. 박막 두께 43㎚ 이하의 얇은 박막에서는 대체적으로 universal curve의 형태를 따르지만 79㎚ 이상의 두꺼운 박막에서는 이차전자 방출곡선이 최고점이 2개인 형태로 변하며 그 값도 전반적으로 낮아진다. 또 입사시키는 일차전자 전류의 증가에 대해서도 이차전자 방출곡선이 전체적으로 낮아진다. 이 실험에서 측정된 최대 이차전자 방출 계수는 박막 두께 19㎚, 일차 전자 에너지 300eV, 일차 전류 0.97㎂일 때 3.35를 갖는다. 이차전자 방출계수가 최대인 입사에너지에서 전자의 시료내 침투깊이와 탈출깊이와의 관계식을 통하여 박막 두께를 이론적으로 계산하였으며, 실험값과 비교적 일치하는 것을 확인하였다. The secondary electron emission (SEE) yields for the thermally grown SiO₂ thin layers were measured by varying the thickness of the SiO₂ layer and the primary current. SiO₂ thin layers were thermally grown in a furnace at 930℃, whose thickness varied to be 5.8㎚, 19㎚, 43㎚, 79㎚, 95㎚, and 114㎚. When the SiO₂ layers were thinner than 43㎚, it was found that SEE curves followed the universal curve. However, for samples with a SiO₂ layer thicker than 79㎚, the SEE curves exhibited two maxima and the values of SEE yields were reduced. Additionally, as the current of primary electrons increased, the SEE yields were reduced. In this experiment, the maximum value of the SEE yield for SiO₂ layers was obtained to be 3.35 when the thickness of SiO₂ layer was 19㎚, with the primary electron energy 300 eV and the primary electron current 0.97 ㎂. The penetration and escape depth of an electron in the SiO₂ layers were calculated at the primary electron energy for the maximum value of the SEE yield and from these depths, it was calculated that the thickness of the SiO₂ layer.
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Emission Stability of Semiconductor Nanowires
SeGi Yu(유세기),Taewon Jeong(정태원),Sang Hyun Lee(이상현),Jungna Heo(허정나),Jeonghee Lee(이정희),Cheol Jin Lee(이철진),Jinyoung Kim(김진영),HyungSook Lee(이형숙),YoonPil Kuk(국윤필),J.M. Kim(김종민) 한국진공학회(ASCT) 2006 Applied Science and Convergence Technology Vol.15 No.5
열 화학기상법으로 만든 GaN와 GaP 나노와이어에서 전계 방출과, 산소와 아르곤 분위기에서 안정성에 대해 조사하였다. GaN 나노와이어의 경우 산소 분위기에서 전계 방출이 급격하게 줄었으나, GaP에서는 그렇지 않았다. 두 나노와이어 모두 아르곤 분위기에서는 큰 변화가 없었다. GaP 나노와이어의 외부에 존재하는 산화물 층이 전자 방출 안정성에 크게 기여한 것으로 생각된다. 나노와이어에서 방출된 전자의 에너지 분포를 통해 반도체 나노와이어는 탄소 나노튜브와 그 전계 방출 메카니즘이 다름을 유추할 수 있었다. Field emission of GaN and GaP nanowires, synthesized by thermal chemical vapor deposition, and their emission stabilities under oxygen and argon environments were investigated. The field emission current of GaN nanowires was seriously deteriorated under oxygen environment, while that of GaP was not. Both wires did not show any noticeable change under argon environment. The existence of oxide outer shell layers in the GaP nanowires was proposed to be a main reason for this emission stability behavior. Field emission energy distributions of electrons from these nanowires revealed that field emission mechanism of the semiconductor nanowires were different from that of carbon nanotubes.
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김창회(Changhoi Kim),정승호(Seungho Jeong),정태원(Taewon Jeong) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
The Live-line work, which is the method of the power line maintenance without the power cut, is widely carried out in the domestic maintenance of distributed power line. The position of robot should be measured and modified the planed path in order to preform the preprogramed tasks for the live-line work. In this paper, we propose the robot position measurement method using a single image of camera which is attached at the base of robot.
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Shock absorber 상태가 ESC 성능에 미치는 영향 연구
김원욱(Wonwook Kim),오승규(Seungkyu Oh),정태원(Taewon Jeong) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
This paper presents a effectiveness of shock absorber condition on vehicle handling performance including ESC(Electric Stability Control) system. ESC is very robustness system and assure the performance without wavering in small change. However it is depend on how well tuned ESC system. To analysis effectiveness of shock absorber, made two different condition of shock absorber assuming that it was worn. One thing is normal condition shock absorber and second is removed nitrogen gas in gas chamber. Shock absorbers were measured damping force for piston distance and velocity by damping machine and compared for damping force characteristic. Than these are applied to two vehicle that are old and present generation vehicle and compared performance on ESC regulation test. Finally, this paper is showed the important to consider about various vehicle and component condition when ESC development.
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정태원 충남대학교 공업교육연구소 1994 論文集 Vol.17 No.1
This paper gives a relationship for estimating the value of the damping ratio ??. Damping ratio is a key factor of second-order system and input is a unit step function. Students have better understanding about damping ratio and its physical meaning.
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