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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(Kyoung-Tae Kim),권용장(Yong-Jang Kwon),이석(Suk Lee) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
철도화물의 수송량은 매년 감소 추세를 보이고 있다. 친환경적 수송수단인 철도의 수송량이 도로로 전환되지 않도록 하기 위해서 다양한 노력을 하고 있지만, 가시적인 효과는 크지 않은 상황이다. 철도화물역의 거점화 추진으로 인해서 화물취급역수는 지속적으로 감소하고 있으며, 철도로 많이 수송되고 있는 벌크화물의 수송 프로세스가 단절되는 현상이 발생하고 있다. 최근 벌크화물 중에서 철도의 주 수송품목인 시멘트, 석탄류의 수송량을 유지하기 위해서 다양한 벌크 컨테이너가 개발되고 있다. 본 연구에서는 2010년 기준 철도로 약 75만톤을 수송하는 광재의 철도물류 프로세스를 분석하고, 이를 개선하기위해 벌크 컨테이너를 활용할 수 있는 방안을 분석하였다. 광재의 철도물류 프로세스 맵을 구축하고, 벌크 컨테이너 도입시 예상되는 물류 프로세스 변화 분석과 작업시간 및 물류비용 변화를 분석함으로써 벌크 컨테이너를 활용한 광재 수송의 가능성을 확인하였다. The volume of rail freight transport has shown an annual decline. Although the railway did various efforts to regain competitiveness, but the visible effect is a modest circumstances. More than 100 freight stations have disappeared for last decade. As a result, railway logistics process has been severed. Recently, various bulk containers to transport bulk cargo has been developed. In this study, we surveyed the logistics process of slag and suggested the improvement methods by introducing hopper-type container. We can cut down logistics cost and time by introducing bulk container to transport slag.
김경태(Kim Kyoung Tae),문대섭(Moon Dae Seop),이진선(Lee Jin Sun),박범환(Park Bum Hwan),이석(Lee Suk) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper explored train frequency of intercity rail station. Main factors to decide train frequency are location of station, social-economic index and land use of station area and travel demand. In this paper, we focused on travel demand which is critical factor to decide train frequency. Tests on a KTX case show that train frequency can be efficiently decreased in weekday to transport same demand. The work has shown many subjects that need further research. It is important to include various factors influencing on train frequency decision.
김경태(Kyoung Tae Kim),민재홍(Jae Hong Min),이인묵(In Mook Lee) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
수도권의 대중교통을 이용하는 승객들은 거의 대부분이 교통카드를 사용하고 있다. 수도권의 대중교통요금이 통합거리비례요금제로 운영되고 있기 때문에 정확한 승하차 정보가 필요하다. 그러나 버스 이용객들은 하차역에서 내릴 때 교통카드를 태그하는 것이 아니라 그 이전에 태그하는 현상이 많이 발생하고 있다. 본 연구에서는 교통카드 데이터를 활용하여 버스 승객들이 비정상적으로 태그하는 행태를 분석하고자 하였으며, 본 연구에서 설정한 기준에 따르면 약 40.3%에 해당하는 승객이 사전에 태그하는 것으로 분석되었다. 따라서 교통카드 데이터를 활용한 대중교통 이용객들의 평균환승거리 산정 시에는 이러한 요인을 충분히 검토하여야 한다. Transportation cards are widely used to travel by public transit in the Seoul metropolitan area. And, passengers have no resistance to transfer from one mode to the other mode because the public transportation fare is only proportional to the travel distance. Passengers have to tag when they get off the bus, but many passengers tag farther in advance. In this study, we analyzed the abnormal tag behavior of bus passengers by utilizing transport card data. It is analyzed that the ratio of tags in advance is equivalent to about 40.3% according to the suggested criteria. When you analyze average transfer distance or transfer behavior using transportation card data these factors should be considered sufficiently.