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반응성 마그네트론 스퍼터링법에 의한 Nickel Oxide 박막 제작 특성에 관한 연구
김기범,황윤식,김영식,박장식,Kim, Gi-Bum,Hwang, Yun-Sik,Kim, Yeung-Shik,Park, Jang-Sick 한국반도체디스플레이기술학회 2008 반도체디스플레이기술학회지 Vol.7 No.1
In this paper, the DE(double erosion) cathode for the reactive magnetron sputtering system is developed for high deposition rate and high target utilization efficiency. The utilization efficiency of the developed DE cathode is 22% higher than that of normal SE(single erosion) cathode. Sputtering process for the nickel oxide thin films with the DE cathode is performed under the following conditions; power with $1kW{\sim}3kW$, pressure with 4mtorr and 8mtorr, oxygen flow ratio with $0%{\sim}80%$. As a result, the hysteresis phenomenon of discharge voltage in 4mtorr is lower than that in 8mtorr and the hysteresis phenomenon of discharge voltage is getting lower as the applied power is getting higher. The structure of cross section and surface roughness of the thin films are observed by FE-SEM and AFM. The structure of cross section of the thin films is columnar and the average surface roughness under oxygen flow ratio of 0%, 52.5% and 65.0% are $2.08{\AA}$, $2.20{\AA}$ and $0.854{\AA}$, respectively.
강인제어 기법과 입력성형법을 이용한 자벌레의 정밀 위치 제어
양광용(Yang, Kwang-Yong),황윤식(Hwang, Yun-Sik),김영식(Kim, Yeung-Shik),김인수(Kim, In-Soo) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.2
This paper presents motion control of the Inchworm composed of the piezoelectric actuators and mechanical elements. Piezoelectric actuator shows nonlinear response characteristics including hysteresis due to the ferroelectric characteristics. This paper proposes feedback control scheme to improve the ability of tracking response to complex input signal and suppress the phenomenon of hysteresis using the sliding mode control technique with the integrator. The sliding mode control system has the limit to minimize both the settle time and overshoot. For making up this limit, this paper also suggests input shaping technique suitable to the inchworm control system.
금속 나노 파티클의 레이저 플라즈모닉 어닐링을 통한 메탈메쉬 전극 형성과 이를 활용한 유연 터치 센서
정성민 ( Seongmin Jeong ),황윤식 ( Yun Sik Hwang ),우유미 ( Yu Mi Woo ),조용준 ( Yong Jun Cho ),김찬혁 ( Chan Hyeok Kim ),안민기 ( Min Gi An ),서호석 ( Ho Seok Seo ),양찬현 ( Chan Hyeon Yang ),박귀일 ( Kwi-il Park ),박정환 ( Jung 한국전기전자재료학회 2024 전기전자재료학회논문지 Vol.37 No.2
Laser-induced plasmonic sintering of metal nanoparticles (NPs) holds significant promise as a technology for producing flexible conducting electrodes. This method offers immediate, straightforward, and scalable manufacturing approaches, eliminating the need for expensive facilities and intricate processes. Nevertheless, the metal NPs come at a high cost due to the intricate synthesis procedures required to ensure long-term reliability in terms of chemical stability and the prevention of NP aggregation. Herein, we induced the self-generation of metal nanoparticles from Ag organometallic ink, and fabricated highly conductive electrodes on flexible substrates through laser-assisted plasmonic annealing. To demonstrate the practicality of the fabricated flexible electrode, it was configured in a mesh pattern, realizing multi-touchable flexible touch screen panel.
LQG/LTR 기법을 이용한 이송자벌레 변위의 정밀 제어
전윤한(Yoon-Han Jeon),황윤식(Yun-Sik Hwang),박흥석(Heung-Seok Park),김인수(In-Soo Kim) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.4
In this study, the linear quadratic Guassian loop transfer recovery (LQG/LTR) control technique was combined with an integrator and applied to an inchworm having piezoelectric actuators for precise motion tracking. The piezoelectric actuator showed nonlinear response characteristics, including hysteresis, due to its ferroelectric characteristics and the residual displacement phenomenon. This paper proposes a feedback control scheme using the LQG/LTR controller with an integrator to improve the ability to track the response to complex input signals and to suppress the phenomenon of hysteresis and residual vibration. Experimental results show that the developed feedback control system for an inchworm can track the various motion contours quickly without residual vibration or overshoot.