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Anti-reflection Coating of Cerium Oxide on a Plastic Substrate
강현일,최원석,김도영 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.2
Cerium oxide (CeO2) films are suitable for use as anti-reflective coatings for display panels, touchscreens, and silicon solar cells. The CeO2 films grown by using a reactive radio frequency sputteringmethod under various deposition conditions was investigated. The CeO2 films were deposited atroom temperature because the plastic substrate was too weak for use at higher temperatures. Thefilms exhibited a strong (111) preferred orientation with properties varying as a function of theprocess conditions. We present the properties of CeO2 anti-reflective coatings on plastic substrates.
Cellular phone용 단일 전원 MMIC single-ended 주파수 혼합기 개발
강현일,이상은,오재응,오승건,곽명현,마동성 대한전자공학회 1997 電子工學會論文誌, D Vol.d34 No.10
An MMIC downconverting mixer for cellular phone application has been successfully developed using an MMIC process including $1 \mu\textrm{m}$ ion implanted gaAs MESFET and passive lumped elements consisting of spiral inductor, $Si_3N_4$ MIM capacitor and NiCr resistor. The configuration of the mixer presented in this paper is single-ended dual-gate FET mixer with common-source self-bias circuits for single power supply operation. The dimension of the fabricated circuit is $1.4 mm \times 1.03 mm $ including all input matching circuits and a mixing circuit. The conversion gian and noise figure of the mixer at LO powr of 0 dBm are 5.5dB and 19dB, respectively. The two-tone IM3 characteristics are also measured, showing -60dBc at RF power of -30dBm. Allisolations between each port show better than 20dB.
강현일,이규일 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.2
Aluminum and boron co-doped zinc-oxide (AZOB) transparent conductive oxide (TCO) films were prepared by DC magnetron sputtering. We investigated the optical and the electrical properties of AZOB thin films as functions of the substrate temperature. A highly c-axis-oriented (002) plane was obtained in all AZOB thin films. The lowest electrical resistivity was 5.16 × 10−4cm in AZOB thin films sputtered at 500 ℃. An average transmittance above 85% was obtained in AZOB thin films sputtered at substrate temperatures above 300 ℃. The optical absorption energy edge of the AZOB thin films sputtered at temperatures above 300 ℃ showed a shift toward lower energy.
강현일 대한영상의학회 1986 대한영상의학회지 Vol.22 No.4
Menetrier's disease is a rare cause of thickened gastric wall. The differential diagnosis of diffuse gastric wall thickening such as lymphoma and adenocarcinoma should be expanded to include Menetrier's diseasee. The authors experienced a case of Menetrier's disease accompanied deep vein thrombosis, which was proved by operation and pathology. We carried out double contrast upper G-I series and computed tomography, and report with review of literatures.
강현일 대한영상의학회 1987 대한영상의학회지 Vol.23 No.2
CT has been widely used in the diagnosis of intra-abdominal abscesses, but its findings of periappendiceal abscesses are not well known. CT findings of 15 cases of periappendiceal abscesses were analyzed retrospectively. RESULT: 1. The most prevalent age groups were 5the. & 6th. decades and a male to female ratio was 7:8. 2. CT findings of periappendiaceal abscesses were cystic low density mass in 7 cases, solid soft tissue mass in 2 patients and mixed density mass in 6 cases. 3. Associated CT findings were fat plane obliteration in 12 cases, fascial thickening in 10 cases, enhancing wall in 7 cases, intrnal air density in 5 cases, cecal wall thickening in 3 cases and ascites in 2 cases. 4. Abscess was localized in RLQ medial to cecum in 10 cases, extended to posterior pararenal space in 2 cases, pelvic cavity in 2 cases and RUQ in 1 case.
Ru/RuO<sub>2</sub>전극에 성장한 PZT 박막의 특성에 관한 연구
강현일,최장현,박영,송준태,Kang, Hyun-Il,Choi, Jang-Hyun,Park, Young,Song, Joon-Tae 한국전기전자재료학회 2002 전기전자재료학회논문지 Vol.15 No.10
The structural and electrical properties of PZT (lead zirconate titante) thin films grown on Pt (platinum) and Ru/Ru $O_2$(ruthenium/ruthenium oxide) electrodes were investigated. Thin films of PZT were deposited on a variety of electrodes using the rf-magnetron sputtering process. PZT films exhibited polycrystalline structure with strong PZT (100) plane and weak (211) plane for an optimizied Pt electrode and (100), (101), (111), (200), (210), (211) planes for Ru/Ru $O_2$. Switching polarization versus fatigue characteristic of Pt/Ti electrodes showed 20% degradation up to 1 $\times$ 10$_{9}$ cycles. No significant fatigue was observed in the films on Ru/Ru $O_2$ electrodes up to Ix109 test cycles. The results show that the new Ru/Ru $O_2$ bottom electrodes are expected to reduce the degradation of ferroelectric fatigue.
강현일,은근,하지혜,김용철,최인수,김동근 국립생물자원관 2016 Journal of species research Vol.5 No.3
Hemicycliophora litoralis is newly collected from Korea. Korean population is well matched and within a range of original description and additional record from Solomon island in de Man’s of L, b, c, V, R, Rex, Ran, Roes, RV (ant), annule, excretory pore, stylet length, and tail length. Differences are observed in RV and RVan. RV and RVan of original description was 55 (48-69) and 14 (10-19) but Korean population is 68 (61-76) and 22 (19-24), respectively. H. litoralis described from Solomon island has RVan of 19.6 (17-23) and is similar to Korean population. H. litoralis from Solomon island has slight higher Rst value of 39 (35-59) compared to Korean population of 33.5 (29-38). The measurements of MB (%), s, G1, G2 values are newly given.
PCS 용 MMIC Single-blanced upconverting 주파수 혼합기 설계 및 제작
강현일,이원상,정기웅,오재응 대한전자공학회 1998 電子工學會論文誌, D Vol.d35 No.4
An MMIC single-balanced upconverting mixer for PCS application has been successfully developed using an MMIC process employed by 1 .mu. ion implanted GaAs MESFET and passive lumped elements consisting of spiral inductor, Si3N4 MIM capacitors and NiCr resistors. The configuration of the mixer presented in this paper is two balanced cascode FET mixers with common-source self-bias circuits for single power supply operation. The dimension of the fabricated circuit including two active baluns intermodulation characteristic with two-tone excitation are also measured, showing -28.17 dBc at IF power of -30 dBm.