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Crystalline and Electrical Properties of BST/4H-SiC Capacitors
이재상,조영덕,고중혁,하재근,구상모 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
We report on the application of high-k dielectric Ba0.5Sr0.5TiO3 (BST) thin films for metalinsulator-semiconductor (MIS) structures on 4H-SiC. The temperature-dependent electrical properties were measured at temperatures up to 250 ℃ and the effect of post-annealing on the structural and the electrical properties of structures were examined by using X-ray diffraction (XRD),atomic force microscopy (AFM) and capacitance-voltage (C-V) measurements. The BST films postannealed at 850 ℃ for 1 hour exhibited enhanced crystalline properties with orientations including the [110] and the [100] directions, increased dielectric constants (~360 at room temperature), and increased average grain sizes (~200 nm) and roughness values (~11.5nm). Stable characterizations of the Ag/BST/4H-SiC capacitors were made at elevated temperatures up to 250 ℃, which demonstrate that the BST/SiC structure is a promising device element for high-temperature applications.
한국의 신생아에서 선천성 대사이상 Screening에 관한 역학조사
이재상,최철석,최규순,이무주,두화선,강상훈,Lee, Jae-Sang,Choi, Cheol-Seok,Choi, Kyu-Soon,Lee, Mu-Ju,Doo, Hwa-Sun,Kang, Sang-Hoon 한국생명보험의학회 1999 保險醫學會誌 Vol.18 No.-
The disorders of congenital metabolic errors causing mental retardation can be prevented by early diagnosis and treatment. We analysed 144,000 neonatal blood samples for phenyketonuria(PKU), maple syrup urine disease(MSUD), homocystinuria(HCU) and histidinuria(HE) by bacterial inhibition method, and galactosemia(GAL) by Paigen method. In our survey, the positive were 4 samples in PKU(4mg/dl;2, 6mg/dl;1, 8mg/dl;1), 8 samples in MSUD(4mg/dl;2, 6mg/dl;2, 8mg/dl;3, 10mg/dl;1), 4 samples in HCU(4mg/dl;2, 6mg/dl;2), 4 samples in Galactosemia(4mg/dl;2, 6mg/dl;1, 8mg/dl;1), respectively. while, no one was positive in HE. The frequncy rate were 1/36,000 for PKU, HCU and GAL, 1/18,000 for MSUD, respectively. But those for HE couldn't be detected in our survey. In this study, the hightest frequency rate was 1/18,000 of MSUD, following were 1/36,000 for PKU, HCU and GAL, respectively. As results our data, it is our opinion that neonatal screening should be performed in terms of national policies for ealy diagnosis and theraphy.