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증착 및 열처리온도에 따른 SCT 박막의 구조적인 특성
김진사,Kim, Jin-Sa 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.3
The (SrCa)$TiO_3$(SCT) thin films were deposited on Pt-coated electrode(Pt/TiN/$SiO_2$/Si) using RF sputtering method according to the deposition condition. The crystallinity of SCT thin films were increased with increase of deposition temperature in the temperature range of $100{\sim}500[^{\circ}C]$. The optimum conditions of RF power and Ar/$O_2$ ratio were 140[W] and 80/20, respectively. Deposition rate of SCT thin films was about $18.75[{\AA}/min]$ at the optimum condition. The composition of SCT thin films deposited on Si substrate is close to stoichiometry (1.081 in A/B ratio). The maximum dielectric constant of SCT thin film was obtained by annealing at $600[^{\circ}C]$.
RF 스퍼터링법에 의한 SCT 박막의 Sr/Ca 비율 영향
김진사,오용철,Kim, Jin-Sa,Oh, Yong-Cheul 한국반도체디스플레이기술학회 2006 반도체디스플레이기술학회지 Vol.5 No.4
The SCT thin films are deposited on Pt-coated electrode($Pt/TiN/SiO_2/Si$) using RF sputtering method with Sr/Ca ratio. The maximum grain of thin films is obtained by ratio of Ca at 15 mol%. The dielectric constant was increased with increasing the ratio of Ca, while it was decreased if the ratio of Ca exceeded over 15 mol%. The dielectric constant changes almost linearly in temperature ranges of $-80{\sim}+90$. All SCT thin films used in this study show the phenomena of dielectric relaxation with the increase of frequency, and the relaxation frequency is observed above 200 kHz. The current-voltage characteristics of SCT thin films showed the increasing leakage current as the measuring temperature increases.
김진사 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.2
In this paper, through the development of a smart panel (LCD kiosk) controller, contents to develop a system that can be operate in a desired environment by operating the window control and ventilation facilities according to the automatic controller operation based on the set values such as temperature, humidity, sunlight, and rainfall. In particular, the MQTT protocol-based sensor module can be directly manufactured and applied at any time based on various communication and power sources such as wireless, wired, and PLC (power line communication) to obtain the desired data, as well as fire, power failure, and intrusion in the house. It is also a system that enables operation and monitoring from a remote location based on the cloud environment by connecting sensors. Kiosks are currently being used in many places, and the demand for them is on the rise, and an active influx of young people can be expected through environmental improvement. It is expected to increase interest and understanding for improvement.
김진사,오용철,조춘남,이동규,신철기,김충혁 대한전기학회 2004 전기학회논문지C Vol.53 No.10-C
The (Sr0.9Ca0.1)TiO3(SCT) thin films are deposited on Pt-coated electrode(Pt/TiN/SiO2/Si) using RF sputtering method at various substrate temperature. The optimum conditions of RF power and Ar/O2 ratio were 140[W] and 80/20, respectively. Deposition rate of SCT thin film was about 18.75[Å/min]. The crystallinity of SCT thin films were increased with increase of substrate temperature in the temperature range of 100~500[℃]. The dielectric constant of SCT thin films were increased with the increase of substrate temperature, and changed almost linearly in temperature ranges of -80~+90[℃]. The current-voltage characteristics of SCT thin films showed the increasing leakage current as the substrate temperature increases
김진사 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.2
Radiation noise due to EMI noise generated by the driving circuits of LED lighting devices in a medical imaging room was reduced by decreasing the noise source in the driving circuits and changing the number of corrections in EMI filters. Noise attenuation and filter changes enabled driving circuits that reduced the electromagnetic waves. Such circuits were efficiently designed by using capacitors and inverters in a given space. Therefore, the malfunction of radiation devices can be minimized by using EMI-reduction filter circuits, and reliable operation of medical devices can be expected by blocking electromagnetic waves. LED조명 제품의 구동회로에서 EMI 방사잡음의 디버깅은 구동회로 잡음원 저감과 EMI 노이즈 필터 개선을 통해 줄일 수 있었다. 디버깅 회로전 초기 노이즈 분석은 PWM 신호 15kHz Switching Noise 및 고조파 성분이 측정 주파수 전대역에서 발생하여 CE와 RE 모두 동일한 Noise 발생하였지만 노이즈 필터회로를 개선한 후 고주파 대역과 저주파 대역에서 노이즈가 감소하는 현상이 나타남을 알 수 있었다. 이는 디버깅 완료 후에는 CE, RE에서 모두 만족할 만한 노이즈를 줄일 수 있음을 알 수 있었다. 노이즈 감소와 필터 개선을 통하여 전자파를 줄인 구동회로는 조명기구를 콘덴서와 인버터를 이용하여 효율적인 회로를 설계함으로서 줄일 수 있었다. 또한 전자파 저감 필터회로를 이용하여 전자파를 차단함으로서 의료기기의 신뢰성 향상을 기대할 수 있다.
김진사,조춘남,신철기,최운식,김충혁,이준웅 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.9
The (S $r_{0.85}$C $a_{0.15}$) Ti $O_3$(SCT) thin films are deposited on Pt-coated electrode (Pt/TiN/ $SiO_2$/Si) using RF sputtering method at various deposition temperature. The crystallinity of SCT thin films were increased with increase of deposition temperature in the temperature range of 200~500[$^{\circ}C$]. Also, the composition of SCT thin films were closed to stoichiometry (1.080~1.111 in A/B ratio). V-I characteristics of SCT thin films show the increasing leakage current with the increases of deposition temperature. The conduction mechanism of the SCT thin films observed in the temperature range of 25~100[$^{\circ}C$] can be divided into four regions with different mechanism by the increasing current. The region I below 0.8[MV/cm]shows the ohmic conduction. The region II between 0.9~2[MV/cm] is in proportion to J∝ $E^{1.5}$ , the region III between 2~4[MV/cm] can be explained by the Child’s law, and the region IV above 4[MV/cm]is dominated by the tunneling effect.ect.
폴리비니리덴플루오라이드 필름의 치수효과에 의한 압전기구(I)
김진사,김상용 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.5
In order to explore the piezoelectric mechanism of the poly(vinylidene fluoride) (PVDF) film, the true piezoelectric constant was expressed in terms of a combination of measurable mechanical and piezoelectric constant values. Each piezoelectric constant was divided into four subgroups according to their boundary conditions and then their interrelations were derived. In addition, the values of piezoelectric constants by the dimensional effect only were calculated. Thus, if we determine the ten constants of piezoelectric film, we can reveal the contribution of the dimensional effect in the piezoelectric mechanism.