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Glass Frit의 첨가에 따른 BaTiO<sub>3</sub> 소결체의 유전 특성 및 미세구조 변화
우덕현,윤만순,손용호,류성림,어순철,권순용,Woo, Duck-Hyun,Yoon, Man-Soon,Son, Yong-Ho,Ryu, Sung-Lim,Ur, Soon-Chul,Kweon, Soon-Yong 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.3
$BaTiO_3$ dielectric ceramics are widely used to multi-layer ceramic capacitor. The $BaTiO_3$ powder was synthesized at $950^{\circ}C$ by using a solid state reaction and grinded by using a high-energy mill. And then, 2.53 wt% glass frit was added to the synthesized $BaTiO_3$ powders for lowering the sintering temperature. The mixed powders were sintered at various temperatures of $1170^{\circ}C$, $1200^{\circ}C$, $1230^{\circ}C$. Microstructures of the sintered $BaTiO_3$ ceramics were inspected by SEM and crystal structures were analyzed by XRD method. The relative dielectric constant was measured by using a impedance/gain phase analyzer. The synthesized $BaTiO_3$ powder had the tetragonal perovskite structure without secondary phase and the particle size was below 200 nm. The relative densities measured at the samples sintered at the temperature above $1200^{\circ}C$ were about 95%. The relative dielectric constant showed maximum value of 2310, which was measured in the specimen sintered at $1200^{\circ}C$. From these results, we could know that the added glass frit had effects on both lowering the sintering temperature and improving the dielectric property.
우덕현 한국자동차공학회 1996 한국자동차공학회 학술강연초록집 Vol.- No.-
차량의 Laternal Dynamics를 향상시킬 수 있는 Motor를 이용한 Power Sreering System을 본 연구논문에서 다루었다. Bond graph를 이용하여Power Boost된 조향계의 수학적 모델을 구성하였으며 Simulation Study를 수행하였다. 제시된 Electric Power Steering System은 운전자의 Inpue는 무시할정도로 작았다. Failure 발생시의 거동에 대해서도 Self Locking Drive System을 이용해 앞바퀴가 Steer 되도록 고려하였다
우덕현 한국산업식품공학회 2018 학술대회 및 심포지엄 Vol.2018 No.04
최근 몇 년간 그리고 앞으로도 당분간 화두가 될 4차 산업혁명과 스마트공장이 실제 식품산업 현장에 적용할 때의 현실과 과제 등에 대해 논의해 보고자 한다. 타 산업에 비해 생물을 다루는 식품 산업의 특성상 원료부터 제품 제조 공정에 대한 현장 운영에 어려움이 존재하며 특히 인력에 의존하는 부분이 많아 생산성 향상, 품질 향상, 식품안전 확보, 에너지 절감에 대한 수요가 큰 편이다. 그러나 스마트 공장과 같은 해결방안이 있음에도 불구하고 공정 자동화와 솔루션 적용에 필요한 재원 투입의 우선 순위에서 밀려 실제 적용 사례는 대기업을 제외하면 부족한 것이 사실이다. 본 세미나에는 주로 농심엔지니어링에서 식품산업에 구축한 스마트 공장 사례를 중심으로 설명하고 대기업뿐 아니라 중소기업 적용 방안에 대해 함께 토의하는 시간을 갖고자 한다.
[I.T.S.부문] 역사상법에 의한 지능형 자율주행 차량의 제어기 개발
우덕현(Durk-Hyun Wuh),연규봉(Kyu-Bong Yeon),이재천(Jae-Cheon Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
The autonomous intelligent cruise control system has been designed and tested. In this paper only one car following has been tested. Autonomous intelligent cruise control system maintains both the speed and the desired distance to the preceding vehicle using constant headway policy, which means that a steady state vehicle spacing is given by the desired headway times vehicle speed. The headway control system has been designed based upon PID control and PID gains are obtained as a function of the headway. In calculating the throttle angle and braking force, an inverse mapping technique is used. Experimental and simulation results were acceptable and driving feel was good
RF 마그네트론 스퍼터링 공정으로 PET 기판 위에 제조한 Ga-doped ZnO 투명전도막의 특성
김정연,김병국,이용구,김재화,우덕현,권순용,임동건,박재환,Kim, Jeong-Yeon,Kim, Byeong-Guk,Lee, Yong-Koo,Kim, Jae-Hwa,Woo, Duck-Hyun,Kweon, Soon-Yong,Lim, Dong-Gun,Park, Jae-Hwan 한국마이크로전자및패키징학회 2010 마이크로전자 및 패키징학회지 Vol.17 No.1
산소 플라즈마 전처리에 의한 PET 기판 위에 Ga이 도핑된 ZnO 투명전극 (GZO)의 특성변화를 고찰하였다. GZO 박막은 RF 마그네트론 스퍼터링 공정에 의해 합성하였으며 GZO 증착 이전에 PET 기판의 표면에너지를 높이고 GZO 박막과의 접촉특성을 향상시키기 위해 산소플라즈마 공정을 적용하였다. 산소 플라즈마 처리공정을 시행함에 따라 GZO 박막의 결정성과 전기적 특성이 향상하였다. RF 파워를 100 W로 하고, 플라즈마 처리시간을 600초로 하였을 때 GZO 박막의 최저 비저항 값인 $1.90{\times}10^{-3}{\Omega}-cm$의 양호한 특성을 확인되었다. The effects of $O_2$ plasma pretreatment on the properties of Ga-doped ZnO films on PET substrate were studied. GZO films were fabricated by RF magnetron sputtering process. To improve surface energy and adhesion between the PET substrate and the GZO film, $O_2$ plasma pretreatment process was used prior to GZO sputtering. As the RF power and the treatment time increased, the crystallinity increased and the contact angle decreased significantly. When the RF power was 100 W and the treatment time was 600 sec in $O_2$ plasma pretreatment process, the resistivity of GZO films on the PET substrate was $1.90{\times}10^{-3}{\Omega}-cm$.
산소플라즈마 전처리된 Polyethylene Naphthalate 기판 위에 증착된 ZnO:Ga 투명전도막의 특성
김병국,김정연,오병진,임동건,박재환,우덕현,권순용,Kim, Byeong-Guk,Kim, Jeong-Yeon,Oh, Byoung-Jin,Lim, Dong-Gun,Park, Jae-Hwan,Woo, Duck-Hyun,Kweon, Soon-Yong 한국재료학회 2010 한국재료학회지 Vol.20 No.4
Transparent conducting oxide (TCO) films are widely used for optoelectronic applications. Among TCO materials, zinc oxide (ZnO) has been studied extensively for its high optical transmission and electrical conduction. In this study, the effects of $O_2$ plasma pretreatment on the properties of Ga-doped ZnO films (GZO) on polyethylene naphthalate (PEN) substrate were studied. The $O_2$ plasma pretreatment process was used instead of conventional oxide buffer layers. The $O_2$ plasma treatment process has several merits compared with the oxide buffer layer treatment, especially on a mass production scale. In this process, an additional sputtering system for oxide composition is not needed and the plasma treatment process is easily adopted as an in-line process. GZO films were fabricated by RF magnetron sputtering process. To improve surface energy and adhesion between the PEN substrate and the GZO film, the $O_2$ plasma pre-treatment process was used prior to GZO sputtering. As the RF power and the treatment time increased, the contact angle decreased and the RMS surface roughness increased significantly. It is believed that the surface energy and adhesive force of the polymer surfaces increased with the $O_2$ plasma treatment and that the crystallinity and grain size of the GZO films increased. When the RF power was 100W and the treatment time was 120 sec in the $O_2$ plasma pretreatment process, the resistivity of the GZO films on the PEN substrate was $1.05\;{\times}\;10^{-3}{\Omega}-cm$, which is an appropriate range for most optoelectronic applications.
박막 증착공정을 사용하여 구현된 초소형 RFID 태그 안테나
정태환,김정연,김병국,박승범,이석진,안상기,우덕현,권순용,임동건,박재환,안중수,Jung, Tae-Hwan,Kim, Jung-Yeon,Kim, Byung-Guk,Park, Seung-Beom,Lee, Seok-Jin,Ahn, Sang-Ki,Woo, Duck-Hyun,Kweon, Soon-Yong,Lim, Dong-Gun,Park, Jae-Hwan,Ahn, J 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.4
Small RFID tag antenna were fabricated on Si substrate and their physical and electrical properties were evaluated. With decreasing the size of tag antenna on Si substrate, small SMD-type RFID tags could be fabricated, which is very useful for various applications including PCB tracking. Firstly, electromagnetic properties on tag antenna pattern were simulated with HFSS. The setup frequency was 13.56 MHz of HF-band RFID. The line-width and line-gap were modeled in the range of $50{\sim}200{\mu}m$. S parameters, SRF, and Q value were calculated from the model. When the line-width and line-gap were 100 urn and the loop-turn was 10, the SRF was 80 MHz and the Q value was ca. 9. When the microstrip antenna pattern of aluminum was fabricated by using DC sputtering, Vpp of ca. 1.6 V was obtained when the reader-tag distance was 40 mm.
구태윤(TaeYun Koo),한종철(JongChul Han),장민규(MinGyu Jang),문진동(JinDong Moon),우덕현(DurkHyeun Wuh) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In these days, vehicle manufacturers and system suppliers are well advanced in their driver assistance system products. Especially, in the development process, the reliability test is essential for the guarantee of driver’s safety and convenience. Many ADAS suppliers should do their best to handle a lot of test cases in their test development process. However, it is difficult to make the same test condition and environment in the real driving test. The driving simulator can be used for the alternative and cost-effective test method. In this study, a driving simulator with a 6-DOF motion platform is developed and we propose the verification process of LDWS(Lane Departure Warning System) using a driving simulator. It is expected that the new test method can be used for other ADAS system test such as LCA(Lane Change Assist System), CAS(Collision Avoidance System), and EDS(Emergency Driving Support).