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이동 통신용 $BiNbO_4$ 세라믹스의 CuO 및 CdO 첨가량에 따른 고주파 유전 특성
윤중락,이헌용,김경용,Yun, Jung-Rak,Lee, Heon-Yong,Kim, Gyeong-Yong 한국재료학회 1998 한국재료학회지 Vol.8 No.11
CuO 및 C얘의 첨가가 $BiNbO_4$ 세라믹스의 고주파 유전특성에 미치는 영향을 조사하였다. CdO 첨가량이 증가함에 따라 소결밀도 및 품질계수는 감소하였고 소결온도가 증가하면 유전상수 및 품질계수는 증가하였다. $BiNbO_4$에 CuO 및 CdO를 각각 0.03wt% 첨가한 시편을 $960^{\circ}C$에서 소결시 유전율 41.2, 품질계수($Q{\times}f_0$) 6,500(at 5.6GHz), 공진주파수 온도계수 $3ppm^{\circ}C$의 우수한 고주파 유전특성을 얻을 수 있었다. The effect of CuO and CdO addition on the microwave dielectric properties of $BiNbO_4$, ceramics were investigated. As the content of CdO increased, sintered density and quality factor decreased. With increasing sintering temperature, both the dielectric constant and quality factor increased. In the case of specimen sintered at $960^{\circ}C$ with addition of 0.03 wt% of CuO and CdO, respectively. the microwave dielectric properties obtained were dielectric constant of 41.2, quality factor ($Q{\times}f_0$) of 6,500 (at 5.6GHz), temperature coefficient of resonant frequency of $3ppm^{\circ}C$.
[차량운동성능부문] 5링크식 멀티링크 현가장치의 설계와 실험차량에의 적용
윤중락(Jung Rak Yun),배상우(Sangwoo Bae),이장무(Jang Moo Lee),탁태오(Tae Oh Tak) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Multi-link, suspension consists of five links which connect wheel and chassis with spherical joints or bushings. In kinematic point of view, multi-link suspension is considered as five spherical-spherical joints, i.e. five disptance constraints, and makes wheel to have one kinematic degree-of-freedom. This suspension has many advantages in kinematic design stage because it has many design variables and optimized design can be achieved to meet designer's needs.<br/> We developed conventional five-link type multi-link rear suspension with two design stages. First stage is the kinematic geometry design stage. In this stage, this new suspension must meet some kinematic constraints, such as toe change, camber change and roll center height change. Second stage is the compliance design stage. In this stage, bushings are selected by optimization technique. This mu1ti-link suspension is adapted to modular experimental vehicle, and validated by road test