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기판온도 및 Annealing에 따른 ZnGa<sub>2</sub>O<sub>4</sub> 형광체 박막의 특성
김용천,홍범주,권상직,이달호,김경환,박용서,최형욱,Kim, Yong-Chun,Hong, Beom-Joo,Kwon, Sang-Jik,Lee, Dal-Ho,Kim, Kyung-Hwan,Park, Yong-Seo,Choi, Hyung-Wook 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.2
A ZnGa$_2$O$_4$ phosphor target was synthesized through solid-state reactions at a calcine temperature of 700 $^{\circ}C$ and sintering temperature of 1300 $^{\circ}C$ in order to deposit ZnGa$_2$O$_4$ phosphor thin film at various temperature using rf magnetron sputtering system. A ZnGa$_2$O$_4$ phosphor thin film was deposited on Si(100) substrate and annealed by a rapid thermal processor(RTP) at 700 $^{\circ}C$, for 15 sec. The x-ray diffraction patterns of ZnGa$_2$O$_4$ phosphor target and thin film showed the main peak (311) direction. ZnGa$_2$O$_4$ thin film has better crystalization due to as function of increasing substrate and annealing temperature. The cathodoluminescence(CL) spectrums of ZnGa$_2$O$_4$ phosphor thin film showed the main peak 420 nm wavelength and the maximum intensity at the substrate temperature of 500 $^{\circ}C$ and annealing temperature of 700 $^{\circ}C$, for 15 sec.
인버터의 직류링크 전압 검출 및 궤환을 위한 절연앰프 회로
김경서(Kyung-Seo Kim) 전력전자학회 2014 전력전자학회 논문지 Vol.19 No.6
This study proposes an isolation amplifier circuit for the sensing and feedback of inverter DC-link voltage, which is inevitable for the precise control of inverter output voltage. The isolation amplifier consists of a pulse-width modulator and a pulse transformer with dual secondary windings. The accuracy of the proposed circuit depends on the precise matching of filter parameters in dual secondary circuits. The influences of parameter inaccuracy on the amplifier performances are analyzed. A modified circuit is proposed to reduce the dependency on filter parameters. The validity of the proposed method is verified through simulation and experiment.
김서린 ( Seo Rin Kim ),최보경 ( Choi Bo Kyung ),김일영 ( Il Young Kim ),손정민 ( Jung Min Son ),성은영 ( Eun Youg Seong ),송상헌 ( Sang Heon Song ),이동원 ( Dong Won Lee ),이수봉 ( Soo Bong Lee ),곽임수 ( Ihm Soo Kwak ) 대한신장학회 2011 Kidney Research and Clinical Practice Vol.30 No.5
A 59-year-old female was admitted with left flank pain. She had heat intolerance and dyspnea for the last 3 years. She was diagnosed as having renal and splenic infarction. 2 phase computed tomography (CT) scan on abdomen and pelvis showed a non-enhancing portion at the anterior aspect of the left kidney and multifocal low density at the spleen. Laboratory examinations revealed TSH 0.0004 uIU/ mL, Free T4 2.69 ng/dL, T3 1.67 ng/mL, anti TPO antibody 207 U/mL (positive), anti TG antibody 52.7 U/mL (positive) and TSH receptor antibody >40 U/mL. A diagnosis of hyperthyroidism was made. Factor VIII activity increased over 160% (normal range 60-140), which has been known to increase in the cases of hyperthyroidism. Except for an increased factor VIII activity there were no thrombogenic abnormalities. She recovered well after the treatment with methimazole in addition to warfarin followed by intravenous heparin. This case is consistent with the assumption that hyperthyroidism, probably through a factor VIII-mediated hypercoagulability, may be a predisposing factor for the development of renal and splenic infarction.
김수선 ( Su Sun Kim ),최보윤 ( Bo Youn Choi ),서승인 ( Seung In Seo ),정민영 ( Min Young Jung ),최혁수 ( Hyuk Su Choi ),안성민 ( Sung Min Ahn ),최원혁 ( Won Hyuk Choi ),김형수 ( Hyoung Su Kim ),김경호 ( Kyung Ho Kim ),장명국 ( Myo 대한소화기학회 2011 대한소화기학회지 Vol.58 No.5
Background/Aims: The tumor-node-metastasis (TNM) staging is an useful system to assess the prognosis of any solid cancer. As new TNM staging classification of 7th stomach cancer was revised in 2009, we evaluated the prognostic predictability of the 7th International Union Against Cancer/American Joint Committee on Cancer (UICC/AJCC) TNM classification compared to 6th UICC/AJCC TNM classification in gastric cancer. Methods: From January 2000 to December 2009, 5-year survival rates of 266 patients with gastric cancer were calculated by the 6th and 7th UICC/AJCC TNM classification. Results: Using the 7th UICC/AJCC TNM classification, there was no significant difference in the 5-year cumulative survival rates (5 YSR) between stage IIA and IIB, IIB and IIIA, and IIIA and IIIB (70% vs. 71%, p=0.530; 71% vs. 80%, p=0.703; 80% vs. 75%, p=0.576, respectively) though significant differences of the survival rates were observed among stages of 6th edition. Using T stage of 7th edition, 5 YSR was not different between T2 and T3 (86% vs. 82%, p=0.655). Using N stage of 7th edition, 5 YSR were not different between N1 and N2, N3a and N3b (79% vs. 81%, p=0.506; 41% vs. 17%, p=0.895, respectively). Conclusions: The 7th UICC/AJCC TNM classification had poor prognostic predictability in gastric cancer compared to the 6th edition. (Korean J Gastroenterol 2011;58:258-263)