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Memory 소자 응용을 위한 BST(Ba_xSr_1-_xTiO_3) 강유전체 박막과 전극과의 계면특성
정민재,조정희,홍석민,김호건,김옥경 漢陽大學校 工學技術硏究所 1997 工學技術論文集 Vol.6 No.1
BaxSr1-xTiO3 powders were prepared by changing stoichiometry of Ba and Sr. After they were calcined and sintered at 1,200℃ and 1,300℃ respectively, BST sputtering targets were made in 3inch mould. For MIM structure capacitors. Pt-based structures such as Pt/TiN/SiO2/Si, Pt/Ti/Si3N4/Si, Pt/SiO2/Si, Ru/SiO2/Si and Ru/Si3N4/Si were used for bottom electrodes, and subsequently, the BaxSrl-xTiO3 thin films were sputtered on them. After the analysis of their structures by XRD, Al was evaporated on the BST films for MIM capacitor. We found that the structures of the films showed good crystallinity above 550℃ from the results of XRD measurements. The largest dielectric constant of films was obtained with 0.7mol% of Ba. The electric properties of the capacitors were very good with Pt/TiN/SiO2/Si electrodes.
Temperature-dependent performance of the erasure machine
정민재,김범준 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.9
Interaction strengths in spin systems can be estimated from the maximum likelihood estimate (MLE) method based on information of spin configurations. The application of the standard MLE method has been known to face serious problems for large data sets since it demands huge computation cost. We test the performance of the erasure machine, which has been recently proposed to overcome such drawbacks of MLE, for the Sherrington–Kirkpatrick model and two-dimensional Ising model. In this paper, we focus on how the performance of the erasure machine varies with the temperature and find that it exhibits the best performance not at criticality, but at somewhat higher temperature. We also attempt to explain such temperature-dependent performance of the erasure machine.
정민재,최용원,손지희,김혜원,정보영,박천욱 대한피부과학회 2019 Annals of Dermatology Vol.31 No.4
Lymphangiomas are rare benign congenital lymphatic malformations. They can be divided into three groups: cutaneous lymphangioma circumscriptum (CLC), cavernous, and cystic. CLC is the most common type, and rarely occurs with cavernous or cystic lymphangioma under the lesion. Here, we describe the case of a 9-year-old girl who presented with an asymptomatic vesicular lesion on her back. She was finally diagnosed with CLC by clinical manifestations, dermoscopic findings, and histologic findings. Seven years ago, there was a history of surgical operation in the department of general surgery, and the surgery was soft tissue cystic lymphangioma removal surgery. There was no skin lesion for seven years after surgery, but one occurred a month ago. Herein, we present a case of CLC that occurred after a long interval after surgery for soft tissue cystic lymphangioma.