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비휘발성 메모리 소자응용을 위한 Eu 첨가량에 따른 BET 박막의 강유전 특성
김경태,김종규,우종창,김관하,김창일,Kim, Kyoung-Tae,Kim, Jong-Gyu,Woo, Jong-Chang,Kim, Gwan-Ha,Kim, Chang-Il 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.3
The effect of Eu contents on the ferroelectric properties of $Bi_{4-x}Eu_xTi_3 O_{12}$ (BET) thin films has been investigated. Bismuth Europium titanate thin films with a Eu contents were prepared on the $Pt/Ti/SiO_2/Si$ substrate by metal-organic decomposition technique. The structure and the morphology of the films were analyzed using X-ray diffraction (XRD) and field emission scanning microscopy (FE-SEM), respectively. From the XRD analysis, it was found that BET thin films have polycrystalline structure, and the layered-perovskite phase is obtained when the Eu contents exceeds 0.2 (x > 0.2). Also, the ferroelectric characteristics of the BET thin films were found to be dependent on the Eu content. Particularly, the BET films doped with x = 0.75 show better ferroelectric properties (remanent polarization 2Pr = 60.99 C/$cm^2$ and only a little polarization fatigue up to $3.5{\times}10^9$ bipolar switching cycling) than those doped with other Eu contents.
김경태,김창일,Kim, Kyoung-Tae,Kim, Chang-Il 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.5
We investigated the structural and electrical properties of BLT films grown on Si covered with $ZrO_{2}$ buffer layer. The BLT thin film and $ZrO_{2}$ buffer layer were fabricated using a metalorganic decomposition method. The electrical properties of the MFIS structure were investigated by varying thickness of the $ZrO_{2}$ layer. AES and TEM show no interdiffusion and reaction that suppressed using the $ZrO_{2}$ film as a buffer layer The width of the memory window in the C-V curves for the MFIS structure decreased with increasing thickness of the $ZrO_{2}$ layer. It is considered that the memory window width of MFIS is not affected by remanent polarization. Leakage current density decreased by about four orders of magnitude after using $ZrO_{2}$ buffer layer. The results show that the $ZrO_{2}$ buffer layers are prospective candidates for applications in MFIS-FET memory devices.
김경태 ( Kyoung Tae Kim ),권정택 ( Jeong Taik Kwon ),홍현종 ( Hyun Jong Hong ),이용철 ( Yong Chul Lee ) 대한뇌종양학회·대한신경종양학회·대한소아뇌종양학회 2005 대한뇌종양학회지 Vol.4 No.1
Intracranial epidermoid tumors usually show homogeneous hypodensity on CT scans and hypointensity on T1-weighted and hyperintensity on T2-weighted MR images. Epidermoid tumors are most often located in the cerebellopontine angle and in the parasellar region. We report an unusual case of middle cranial fossa epidermoid tumor. The tumor showed inhomogeneous low density on CT scan and heterogeneous signal intensity on both T1- and T2-weighted MR images. Epidermoid tumors are usually slow growing tumor and are located in adjacent region of cranial nerve, so we must consider age and postoperative neurological defici of patient before operation.
김경태(Kim, Kyoung-Tae),한혜련(Han, Hae-Ryon) 한국실내디자인학회 2016 한국실내디자인학회논문집 Vol.25 No.5
This study was to research and study whether the types of interaction design perform the effective functions and roles as the exhibition space that audiences want centered in the digital media exhibition space. It was to suggest effective space characteristics through analyzing how the interaction design was expressed at the exhibition space and its application. For the analysis, it completes theoretical inquiry on the classification of the space characteristics according to the concept type of interaction and design characteristics. Based on it, it directly visited the exhibition space that reflected the interaction design centered in Seoul City, experienced the given experience, and designed the analyzing frame by composing a checklist after the observation research. Through the designed analysis, it performed a site questionnaire to audiences. It induced the conclusion as follows after analyzing the case space that reflected the interaction design type. First, the program analysis of the space that has the variability is necessary through a variety of digital analysis as there is a limitation that the characteristic of digital media has. Second, in the concept type of the interaction design, it needs the interaction stage among people that can communicate with audiences and stimulate their senses through vidual factors. Third, in the characteristic of the interaction design, it should try to use effective contents to get over the limitation of the space through the interaction in the designated space in case of exhibition. In the following research, it needs to study on the variety of stage plans in detail by supplying contents to audiences and grafting to the exhibition space continuously through using the interaction design that uses digital media at there.