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The Electronic and Optical Properties of IZO Thin Films Prepared by Pulsed DC Magnetron Sputtering
S. T. Kim,박승환,J. M. Yang,J. S. Hong,H. M. Kim,J. H. Lee,김종재,J. Y. Yang,Ju Young Moon,S. W. Ryu,홍우표 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.3
The electrical and the optical properties of In$_{2}$O$_{3}$-ZnO (IZO) films grown by using the pulsed dc magnetron sputtering method are investigated. We find that the average transmittance of the films in the visible range becomes over 85 \% and that the optical band gap is about 3.3 eV, irrespective of the repetition frequency. The X-ray diffraction patterns for the film with a Zn content of 22 at.\% show the crystalline structure to be amorphous. The growth rate and the sheet resistance of the film are shown to increase with increasing repetition frequency. Also, in a range of relatively thin thickness, the films grown with higher repetition frequency have higher refractive indices while, in the range of relatively thick thicknesses, the refractive index is nearly independent of the frequency.
Yang Jiyoung,Kim Hwamin,J. Y. Kim,Hong J-S,홍우표,Kim S-T,김종재,Moon J-Y,박승환 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.3
Various diatomic inorganic films and their composite films are packed as passivation films around Ca cells on glass substrates by using an electron-beam evaporation technique. When these Ca cells are exposed to an ambient atmosphere, the water vapor penetrating through the passivation layers is adsorbed in the Ca cells, resulting in a gradual progress of transparency in the Ca cells, which cna be represented by changes of the optical transmittance in the visible range. Compared with the saturation times for the Ca cells to become completely transparent in the atmosphere, the protection effects of water vapor are estimated for various passivation films. The composite films are found to show a superior protection effect of water vapor as compared with diatomic inorganic films. Also, the main factors affecting the permeation of water vapor through the oxide films are found to be the polarizability and the packing density.
공충식,김성철,김대연,김인구,남궁정만,황지희,김종재,Gong, C.S.,Kim, S.C.,Kim, D.Y.,Kim, I.K.,Namgung, J.M.,Hwang, J.H.,Kim, J.J. 대한소아외과학회 2013 소아외과 Vol.19 No.2
The purposes of this study was to describe the clinical correlation of mass size and gestational age, prognostic factors in sacrococcygeal teratoma (SCT) at a tertiary pediatric surgery, University of Ulsan College of Medicine and Asan Medical Center (AMC), Seoul, Korea. Fifty five patients admitted to the AMC with a SCT between May 1989 and April 2013 were included in this retrospective review. Mean follow up was 861 days. Mean maternal age at delivery was $30{\pm}2.7$ year, mean gestational age (GA) was $36.9{\pm}3.6$ wks, and preterm delivery was 21.8%. Birth body weight was $3182{\pm}644$ g and male vs. female ratio was 1:2.05. We can't find significant difference between Caesarean section and maternal age at delivery (p =0.817). But, caesarean section was favored by gestational age (p = 0.002), larger tumor size (p =0.029) or higher tumor weight fraction rate to birth body weight (p =0.024). Type I was 13, II 21, III 17, and IV 3 according to Altman et al. classification. The tumor component was predominantly cystic(> 50%) in 73.1 %. And the majority histological classification of tumors were mature teratoma (70.3%). The motality rate was 5.5%. Three patients expired because of postpartum bleeding, post-op bleeding related complication such as DIC. SCT recurred in four patients. The interval between first and second operation was $206.2{\pm}111.0$ d (range 53~325 d). In two patients, serum AFP levels were elevated at a regular checkup without any symptom, and subsequent imaging studies revealed SCT. The most common cause of death was bleeding and bleeding related complication. So Caesarean section and active peripartum and perioperative management will be needed for huge solid SCT. In the case of Yolk sac tumor or huge immature teratoma, possibility of recurrence have to be always considered, so follow up by serial AFP and MRI is important for SCT management.
S-W. Ryu,김종재,B-C. Ahn,H-M. Kim,J-S Hong,J-Y. Yang,박승환,S-T. Kim,홍우표 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
Transparent and conducting In$_2$O$_3$-SnO$_2$ (ITO) thin films were prepared on glass substrates at room temperature by using a DC sputtering method. We investigated the optical, electrical, and structural properties of the ITO films, especially the dependence on the distance between the cathode and the substrate (to be referred to as the `CS-gap', $d_{CS}$), and examined the optimum condition of the CS-gap to ensure a high-quality ITO film in an in-line DC sputtering system. The optical property of the films does not change, showing an average transmittance greater than 85 \% in the visible-light range, with the variation of the deposition condition with different values of $d_{CS}$. As the CS-gap becomes larger, the sheet resistance and the resistivity of the films increase slightly, but the deposition rate decreases linearly. The ITO films deposited at 55 mm $< d_{CS} \leq$ 65 mm show the most excellent uniformity in the surface morphology while the films deposited at $d_{CS} > 70$ mm become rapidly coarse-grained. For $d_{CS} > 55$ mm, nearly uniform sheet resistances, within a variation smaller than $\pm$5 \%, are observed in the region of the substrate center, which corresponds to the erosion area of the ITO target.