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박용준,남산,이영진,정영훈,백종후,김대준,이우영,Park, Yong-Jun,Nahm, Sahn,Lee, Young-Jin,Jeong, Young-Hun,Paik, Jong-Hoo,Kim, Dae-Joon,Lee, Woo-Young 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.7
The effects of $Nb_2O_5$ and $MnO_2$ on the positive temperature coefficient of resistivity (PTCR) behavior of lead-free $Ba_{0.99}(Bi_{1/2}Na_{1/2})_{0.01}TiO_3$ (BaBiNT) ceramics were investigated in order to fabricate a PTC thermistor available at high temperature of > $120^{\circ}C$. In particular, 0.05 mol% $Nb_2O_5$ added BaBiNT ceramic, which has significantly increased Curie temperature (Tc) of $160^{\circ}C$, showed good PTCR behavior; low resistivity at room temperature $(\rho_r)$ of $80.1{\Omega}{\cdot}cm$, a high $\rho_{max}/\rho_{min}$ ratio of $5.65{\times}10^3$ and a large resistivity temperature factor (a) of 18.5%/$^{\circ}C$. Furthermore, the improved $\rho_{max}/\rho_{min}$ of $6.48{\times}10^4$ and a of 25.4%/$^{\circ}C$ along with higher $T_c$ of $167^{\circ}C$ despite slightly increased $\rho_r$ of $569{\Omega}{\cdot}cm$, could be obtained for the BaBiNT + 0.05 mol% $Nb_2O_5$ + 0.02 wt% $MnO_2$ ceramic cooled down at a rate of $200^{\circ}C/h$.
TiN 기판 위에 성장시킨 비정질 BaSm<sub>2</sub>Ti<sub>4</sub>O<sub>12</sub> 박막의 구조 및 전기적 특성 연구
박용준,백종후,이영진,정영훈,남산,Park, Yong-Jun,Paik, Jong-Hoo,Lee, Young-Jin,Jeong, Young-Hun,Nahm, Sahn 한국재료학회 2008 한국재료학회지 Vol.18 No.4
The structural and electrical properties of amorphous $BaSm_2Ti_4O_{12}$ (BSmT) films on a $TiN/SiO_2/Si$ substrate deposited using a RF magnetron sputtering method were investigated. The deposition of BSmT films was carried out at $300^{\circ}C$ in a mixed oxygen and argon ($O_2$ : Ar = 1 : 4) atmosphere with a total pressure of 8.0 mTorr. In particular, a 45 nm-thick amorphous BSmT film exhibited a high capacitance density and low dissipation factor of $7.60\;fF/{\mu}m2$ and 1.3%, respectively, with a dielectric constant of 38 at 100 kHz. Its capacitance showed very little change, even in GHz ranges from 1.0 GHz to 6.0 GHz. The quality factor of the BSmT film was as high as 67 at 6 GHz. The leakage current density of the BSmT film was also very low, at approximately $5.11\;nA/cm^2$ at 2 V; its conduction mechanism was explained by the the Poole-Frenkel emission. The quadratic voltage coefficient of capacitance of the BSmT film was approximately $698\;ppm/V^2$, which is higher than the required value (<$100\;ppm/V^2$) for RF application. This could be reduced by improving the process condition. The temperature coefficient of capacitance of the film was low at nearly $296\;ppm/^{\circ}C$ at 100 kHz. Therefore, amorphous BSmT grown on a TiN substrate is a viable candidate material for a metal-insulator-metal capacitor.
BaSrTiO₃를 이용한 embedded capacitor의 제작 및 특성 평가
박용준(Yong-Jun Park),유희욱(Hee-Wook You),남송민(Song-Min Nam),구상모(Sang-Mo Koo),박재영(Jae-Yeong Park),이영희(Young-Hie Lee),고중혁(Jung-Hyuk Koh) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
최근 고주파 유전체 소재로 많이 연구가 되고 있는 BaSrTiO₃ 소재와 polymer계열을 이용한 composite복합체를 이용하여 embedded capacitor를 제작하였으며, 후막을 제작하기 위한 방법으로는 두께의 신뢰성이 비교적 높은 screen printing기법을 사용하여 제작하였다. 제작된 소자의 온도별, 주파수별 특성을 연구하여 그 응용 가능성을 알아보았다.
CFD 시뮬레이션을 통한 원전 해체용 중력식 포집장치 개발
박용준 ( Park Yong Jun ),신재경 ( Shin Jae Kyung ),김경민 ( Kim Kyoung Min ),김은영 ( Kim Eun Young ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
In this study, the development of gravity type collecting device for nuclear dismantling through CFD simulation is shown as follows. As a result of investigating the dust removal efficiency according to the treatment air velocity of 5 m/s (low speed) ~ 30 m/s (high speed), large dusts (80 ~ 100 ㎛) As the wind speed increases, the damping efficiency decreases and the particle size of the dust behavior increases with the increase of the wind speed. As a result, the wind speed (wind speed) 5 m/s is considered to be suitable for improving the vibration damping efficiency.