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Young, Yeom-Geun Materials Research Society of Korea 1993 한국재료학회지 Vol.3 No.5
Radiation damage and contamination of silicons etched in the $CF_4+H_2$ and $CHF_3$ magnetron discharges have been characterized using Schottky diode characteristics, TEM, AES, and SIMS as a function of applied magnetic field strength. It turned out that, as the magnetic field strength increased, the radiation damage measured by cross sectional TEM and by leakage current of Schottky diodes decreased colse to that of wet dtched samples especially for $CF_4$ plasma etched samples, For $CF_4+H_2$and $CHF_3$ etched samples, hydrogen from the plasmas introduced extended defects to the silicon and this caused increased leakage current to the samples etched at low magnetic field strength conditions by hydrogen passivation. The thickness of polymer with the increasing magnetic field strength and showed the minimum polymer residue thickness near the 100Gauss where the silicon etch rate was maximum. Also, other contaminants such as target material were found to be minimum on the etched silicon surface near the highest etch rate condition.
Successful treatment by exchange transfusion of a young infant with sodium nitroprusside poisoning
Baek, Jong-Geun,Jeong, Hoar-Lim,Park, Ji-Sook,Seo, Ji-Hyun,Park, Eun-Sil,Lim, Jae-Young,Park, Chan-Hoo,Woo, Hyang-Ok,Youn, Hee-Shang,Yeom, Jung-Sook The Korean Pediatric Society 2010 Clinical and Experimental Pediatrics (CEP) Vol.53 No.8
Although sodium nitroprusside (SNP) is often used in pediatric intensive care units, cyanide toxicity can occur after SNP treatment. To treat SNP-induced cyanide poisoning, antidotes such as amyl nitrite, sodium nitrite, sodium thiosulfate, and hydroxycobalamin should be administered immediately after diagnosis. Here, we report the first case of a very young infant whose SNP-induced cyanide poisoning was successfully treated by exchange transfusion. The success of this alternative method may be related to the fact that exchange transfusion not only removes the cyanide from the blood but also activates detoxification systems by supplying sulfur-rich plasma. Moreover, exchange transfusion replaces cyanide-contaminated erythrocytes with fresh erythrocytes, thereby improving the blood's oxygen carrying capacity more rapidly than antidote therapy. Therefore, we believe that exchange transfusion might be an effective therapeutic modality for critical cases of cyanide poisoning.
임종태,Geun young Yeom,Chang hyun Jeong,Jong hyeuk Lim,June hee Lee,Nam gil Cho 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
To fabricate a top-emitting organic light-emitting diode (TEOLED) with a high aperture ratio and high resolution, we deposited an n-type indium oxide (IO) as a transparent conducting electrode, by using oxygen-ion-beam-assisted deposition (IBAD), on a device of glass/ITO/NPB (60 nm)/Alq3 (60 nm)/LiF (1 nm)/Al (2 nm)/Ag (20 nm), and we investigated its characteristics. To minimize the damage to the organic layers and the oxidation of the Ag layer during the oxygen IBAD, we required a two-step processing of IBAD composed of argon IBAD followed by oxygen IBAD. By the two-step processing of the IO thin film deposition using IBAD, TEOLED devices having emission on both sides could be formed successfully with an external quantum efficiency of 0.47 % and a luminous efficiency of 0.22 lm/W at a luminance of about 100 Cd/m2. With this device, a maximum luminance of 12,500 Cd/m2 was obtained at the glass surface of the device. Even though the overall quantum efficiency of this device was very low, we believe that it can be improved by optimizing oxygen-ion-beam processing used to fabricate the IO thin films and by optimizing the thickness of the semitransparent conducting protecting layer to reduce ion-beam-induced damage.
임종태,Geun Young Yeom,June Hee Lee,Yang Su Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2
This study used ultraviolet photoelectron spectroscopy (UPS) and X-ray photoemission spectroscopy (XPS) to examine the interfacial electronic structures of Cs deposited on tris(8-quinolinolato)aluminum (III) (Alq₃). In the valence band spectra, the low work function of Cs reduces the barrier height for electron injection (ΦnB) in the Cs-on-Alq₃ interfaces to 0.2 eV when a 1- ~ 3-nm-thick layer of Cs is deposited on Alq₃. This decrease in ΦnB to 0.6 eV means more efficient electron injection than with a ΦnB of 0.8 eV for the pure Alq₃ layer. The XPS O 1s peak revealed a two-step interface reaction, which showed the formation of a stable radical anion for low Cs coverage (θCs ≤ 0.4 nm) and the appearance of a metallic component through the decomposition of the highly reactive Cs at higher coverage (θCs ≥ 1.0 nm). Top-emitting organic light-emitting diodes with θCs (1.0 nm) based on these interfacial electronic structures showed much higher device performance with a luminous efficiency of 2.0 % and a maximum luminance of 48000 cd/m² compared to other devices with θCs > 1.0 nm.