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산소 기체를 이용한 ALD법으로 층착한 ZnO박막의 증착 온도가 전기적 특성에 미치는 영향
진용욱,강상원 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
ZnO 박막의 증착 온도에 따른 결정성과 전기적 특성의 변화를 살펴보기 위해 기판 온도를 250℃에서 350℃까지 변화시켜가며 SiO₂ 기판 위에서 O₂ 가스를 이용한 ALD 방법을 통해 ZnO 박막을 증착하였다. 기판 온도가 25℃에서 300℃인 구간에서는 기판 온도가 증가함에 따라 증착량이 소량 증가하였고 그에 반해 비저항은 감소하는 것을 볼 수 있었다. 이러한 비저항의 감소는 ZnO 박막의 결정성 증가 때문이라고 볼 수 있다. 300℃에서 증착한 경우 ZnO 박막의 ZnO 박막의 증착량은 1.09A/cycle이었고 비저항은 7×10?μΩ㎝이었다. 기판 온도가 300℃에서 350℃로 변하는 구간에서는 비저항이 3×10?μΩ㎝에서 600μΩ㎝까지 급격하게 강소하는 것을 볼 수 있다. 이러한 비저항의 급격한 감소는 박막 내부 산소 공공에 의한 선자의 캐리어 농도가 증가하기 때문일 것으로 예상된다. 350℃에서 ZnO 박막의 이동도는 23.95㎠/Vs이고 캐리어 농도는 6.4×10¹?㎝?³이다. ZnO thin films were prepared by atomic layer deposition using O₂ gas on SiO₂ substrates at different temperatures varying from 250℃ to 300℃, to observe the effect of temperature on the crystallinity and the electrical properties of ZnO films. At the temperature varying from 250℃ to 300℃, the growth rate of ZnO thin films increases and resistivity of ZnO films decreases as the substrate temperature increases. This resistivity decrease is caused by increase of the crystallinity of ZnO thin films. At 300℃, the growth rate of ZnO films was saturated at 1.09A/cycle and the resistivity of ZnO films was 7×10?μΩ㎝. Especially, the resistivity difference between 300℃ and 350℃ shows abrupt decrease from 3×10?μΩ㎝ to 600μΩ㎝. This abrupt decrease of resistivity is expected to be caused by the increase of electron carrier concentration due to the oxygen vacancy. At 350℃, mobility and carrier concentration of ZnO films were 23.95㎠/Vs and 6.4×10¹?㎝?³.
부분 구조법에 의한 주파수 응답 해석에서의 개선된 동적 커플링 기법
홍성욱,진용욱 金烏工科大學校 1995 論文集 Vol.16 No.-
The present paper proposes an efficient method for computation of the frequency response matrices of linear structural dynamic systems modeled with substructuring technique. An effective coupling scheme for frequency response is proposed to obtain the frequency response matrix of the whole system by making use of frequency responses of substructures without resulting in any errors. The proposed method necessitates neither an erroneous reduction of coordinates nor a coordinates transformation which is likely to make the system matrix sparse. The proposed method is formulated in detail and illustrated through numerical examples. The numerical study shows that the proposed method is very efficient compared with the conventional method.
수동 변속기 차량의 공회전시 이상 소음 저감을 위한 클러치 개선에 관한 실험적 연구
진용욱(Y.W.Jin),허만대(M.D.Hur),한경래(K.R.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
Research for idling rattle noise is one of the most important issues for noise reduction in diesel engine vehicles. Although many researchers reported optimization methods for clutch torsional characteristics to reduce the idle gear rattle, only a few researchers take into account the clutch damper as a design parameter. This paper investigates an erratic noise during idling condition in the drive train. Through the theoretical and experimental analysis, it is concluded that the erratic noise is mainly due to the resonance in the clutch. This paper also describes a design modification for the pre-damper clutch to remove the erratic noise.<br/>
김영일,진용욱 대한전자공학회 1996 전자공학회논문지-B Vol.b33 No.6
In this paper, we analyze the traffic characteristics in microcell and macrocell overlaid PCS system which process voice and dta calls separately each others. in this system, data calls are delayed in queue when all of channels are occupied, while voice calls are bolcked in that case. For this, we calculated inter-microcell handoff area dwelling time distribution and handoff area dwelling time distribution between microcell and macrocell. We analyze traffic performance using this results. We used M/M/C/K model, and analyzed traffic performance of macrocell with handoff area variation of microcell.
신석영(Seokyoung shin),원광민(Kwangmin Won),이승엽(Sungyop Lee),김진현(Jinhyun Kim),진용욱(Yong Wook Jin),김성열(Sungyeol Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
4WD Driveline is quite a bit complex system. It has more parts than 2WD driveline. Therefore it is necessary to consider the whole system to make good performance. In this paper we studied 4WD driveline booming and transfer rattle noise among many 4WD problems. 4WD booming and transfer rattle noise take place when 4WD driveline is not properly designed. There are driveline natural modes in 4WD driveline system. When the system is not properly designed, one of the modes is the reason of Booming and transfer rattle noise. We showed the mechanism of 4WD booming and transfer rattle noise in test and simulation. Through test & simulation, we examine solutions like DMF, transfer gear ratio and 4WD coupling tuning..