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표면 Micromachining법을 이용한 MIMIC용 ZnO-FBAR(Thin-Film Bulk Acoustic Wave Resonator)의 제조 및 그 특성
김상호,조인귀,이석헌,최현철,이용현 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
FBAR(Thin-Film Bulk Acoustic wave Resonator) is monolithically integrable with semiconductor device, leading to small size and low cost, high Q rf circuit elements with applications in the radar and communications area. FBAR with Air-gap used in high frequency range(GHz range) was fabricated by surface micromachining technique. Zinc Oxide(ZnO) thin film was used as piezoelectric material and was deposited by rf magnetron sputtering. The thickness of ZnO thin film was about 1 μm. Thin metal film(Ni-Cr:50 Å/Au:1000 Å) was used as top and bottom electrodes to reduce acoustic wave loss. The measured resonant frequency of the FBAR was 2.95 GHz and S_(11) value(forward reflection value) was -18.912 dB.
심상철,최귀남,오대희 경북대학교 교육대학원 1984 논문집 Vol.16 No.-
Organic azides were reduced to organic amines in high yields with tetracarbonylhydridoferrate as a highly selective reducing agent at room temperature under carbon monoxide. And also, Organic azides were reduced to organic amines in moderate yields by water gas shift reaction(wgsr) using transition metal complexes such as rhodium and palladium at 150℃ for 4hr under pressures of carbon monoxide(20∼40atm).
Kui Sun Choi,Dong-Sik Kim,Sung Won Jung,Young-Dong Yu,Sung Ock Suh 한국간담췌외과학회 2014 한국간담췌외과학회지 Vol.18 No.4
Backgrounds/Aims: The prognosis of hepatic resection for hepatocellular carcinoma (HCC) in patients with cirrhosis is worse than in those without cirrhosis. In Korea, the hepatitis B virus prevalence rate is higher than in other countries. Therefore, we investigated patients’ clinicopathologic and metabolic factors that affect the postoperative outcomes of hepatic resection for HCC in our hospital in Korea. Methods: From August 2000 to December 2012, 171 HCC patients underwent hepatic resections at our institution. Two operative mortality cases and two short-term follow up cases were excluded. Data was collected from a retrospective chart review. There were 133 males (79.6%) and 34 females (20.3%), with a mean age of 58.2±10.2 years (range, 22-81 years), and the relationship between clinicopathologic and metabolic factors and the prognosis of patients with HCC undergoing hepatic resection were evaluated by univariate and multivariate analysis. Results: Hypertension, major surgery, perioperative transfusion, resection with radiofrequency ablation (RFA) or cryoablation, and resection margin were risk factors for overall survival, and hypertension, albumin, resection with RFA or cryoablation, perioperative transfusion, and tumor size were risk factors for disease-free survival. Conclusions: We found that hypertension, perioperative transfusion, and resection with RFA or cryoablation were risk factors for both disease-free and overall survival after hepatic resection in HCC patients. Further study is required to clarify the influence of metabolic and other clinicopathologic factors on the prognosis of HCC.
Choi, Jae-Seok,Lee, Young-Jun,Kim, Tae-Hyung,Lim, Hyun-Jung,Ahn, Mee-Young,Kwack, Seung-Jun,Kang, Tae-Seok,Park, Kui-Lea,Lee, Jae-Won,Kim, Nam-Deuk,Jeong, Tae-Cheon,Kim, Sang-Geum,Jeong, Hye-Gwang,Lee Korean Society of ToxicologyKorea Environmental Mu 2011 Toxicological Research Vol.28 No.2
Brominated flame retardants (BFRs) are present in many consumer products ranging from fabrics to plastics and electronics. Wide use of flame retardants can pose an environmental hazard, which makes it important to determine the mechanism of their toxicity. In the present study, dose-dependent toxicity of tetrabromobisphenol A (TBBPA), a flame retardant, was examined in male prepubertal rats (postnatal day 18) treated orally with TBBPA at 0, 125, 250 or 500 mg/kg for 30 days. There were no differences in body weight gain between the control and TBBPA-treated groups. However, absolute and relative liver weights were significantly increased in high dose of TBBPA-treated groups. TBBPA treatment led to significant induction of CYP2B1 and constitutive androstane receptor (CAR) expression in the liver. In addition, serum thyroxin (T4) concentration was significantly reduced in the TBBPA treated group. These results indicate that repeated exposure to TBBPA induces drug-metabolising enzymes in rats through the CAR signaling pathway. In particular, TBBPA efficiently produced reactive oxygen species (ROS) through CYP2B1 induction in rats. We measured 8-hydroxy-2'-deoxyguanosine (8-OHdG), a biomarker of DNA oxidative damage, in the kidney, liver and testes of rats following TBBPA treatment. As expected, TBBPA strongly induced the production of 8-OHdG in the testis and kidney. These observations suggest that TBBPA-induced target organ toxicity may be due to ROS produced by metabolism of TBBPA in Sprague-Dawley rats.
Identification and Characterization of Cercospora malayensis Causing Leaf Spot on Kenaf
( Sung-hee Park ),( In-young Choi ),( Wang-hyu Lee ),( Kui-jae Lee ),( Victor Galea ),( Hyeon-dong Shin ) 한국균학회 2017 Mycobiology Vol.45 No.2
In September 2013 and 2014, a significant number of kenaf plants showing symptoms of leaf spots with approximately 50% incidence were found in experimental plots in Iksan and Namwon, Korea. Leaf spots were circular to irregular, more or less vein-limited, reaching to 10 mm in diameter. The spots were initially uniformly brown to reddish brown, turning pale brown with a purplish margin and showing grayish patches on the lesion due to heavy fructification. The causative agent of the leaf spot disease was identified as Cercospora malayensis. The pathogenicity test was conducted with similar results, which fulfilled Koch`s postulates. This is the first report of C. malayensis infection of kenaf in Korea.
Job loss and reemployment after a cancer diagnosis in Koreans—a prospective cohort study
Choi, Kui Son,Kim, Eun-Jung,Lim, Jin-Hwa,Kim, Sung-Gyeong,Lim, Min Kyung,Park, Jae-Gahb,Park, Eun-Cheol JOHN WILEY & SONS LTD, JOURNALS 2007 PSYCHOONCOLOGY Vol.16 No.3
<P>Patients undergoing treatment for cancer have reported a variety of work-related problems. The aim of this study was to investigate the impact of a cancer diagnosis on employment status, and to identify relevant associated factors. This prospective cohort study was conducted at the National Cancer Center in Korea. Male patients newly diagnosed with stomach, liver, or colorectal cancers were recruited. Patients were interviewed and asked to complete an employment questionnaire every 3 months for 24 months. Clinical, sociodemographic and work-related factors were assessed. There were 305 male patients who had a primary diagnosis of cancer and underwent appropriate treatment. Of the 305 male patients who were employed at the time of diagnosis, 53% lost their job, and of these 23% later reemployed. In a multivariate Cox regression analysis, job loss was significantly associated with years of education, job characteristics and disease stage. Reemployment was significantly associated with disease stage and cancer site. Change of employment was common among cancer patients in Korea. With an understanding of the factors involved, it should be possible to reduce unnecessary work cessation, and increase the rate of employment of cancer survivors. Copyright © 2006 John Wiley & Sons, Ltd.</P>
A Preliminary Design of Flight Test Conditions for a Sub-scale RBCC Engine using a Sounding Rocket
Hye-Sung Kim,Kui-Soon Kim,Se-Jong Oh,Jeong-Yeol Choi,Won-Seok Yang 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.4
Various R&D programs for rocket-based combined cycle (RBCC) engines have progressed worldwide for the space development and the defense applications. As a way toward indigenous domestic RBCC program, a preliminary design of flight test conditions was studied in this study for a sub-scale RBCC engine using a sounding rocket. Launch and flight profiles were calculated for several booster options and compared with that of HyShot II program. The result shows that the Korea Sounding Rocket-II (KSR-II) is a proper candidate to perform the flight test available in Korea. The recommend flight test conditions with KSR-II are Mach 6.0 with a test vehicle of 230 kg and Mach 7.4 with 50 kg. Present study will soon be followed by a design of sub-scale RBCC for a flight test using a sounding rocket.