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RISS 인기검색어
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- 저자 : 홍재석(Jae Suk Hong) (검색결과 4 건)
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Rf-magnetron Sputtering 장치에 의해 제작된 SiO<sub>2</sub>가 도핑된 ZnO 박막의 전기적 및 광학적 특성
배강,손선영,홍재석,김화민,Bae, Kang,Sohn, Sun-Young,Hong, Jae-Suk,Kim, Hwa-Min 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.11
In this study, the electrical and optical properties of $(SiO_2)_x(ZnO)_{100-x}$ (SZO) films prepared on the coming 7059 glass substrates by using rf-magnetron sputtering method are investigated. The deposition rate becomes maximum near 3 wt.% and gradually decreases when the $SiO_2$ content further increases. The growth rates of the SZO film with $SiO_2$ content of 3 wt.% is $4\;{\AA}/s$. We found that the average transmittance of all films is over 80% in the wavelength range above 500 nm. The optical band gap were decreased from 3.52 to 3.33 eV as an increase the deposition thickness. X-ray diffraction patterns showed that the film with a relatively low $SiO_2$ content (< 4 wt.%) is amorphous. SZO film with the $SiO_2$ contents of 2 wt.% showed the resistivity of about $3.8{\times}10^{-3}\;{\Omega}{\cdot}cm$. The sheet resistance decreases with increasing the heat treatment temperature.
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인삼섭취와 암발생과의 관련성에 관한 연구 - 강화코호트연구 -
변주선,오희철,홍재석,손태용,이상욱,Byun, Joo-Sun,Ohrr, Hee-Choul,Hong, Jae-Suk,Sohn, Tae-Yong,Yi, Sang-Wook 대한예방의학회 2003 예방의학회지 Vol.36 No.4
Objectives : There are many concerns about ginseng as a cancer chemopreventive substance, but there have been few epidemiological studies on ginseng, This study sought to examine the relationships between ginseng intake and cancer incidence in the Kangwha cohort. Methods ; Between March 1985 and December 1999, 2697 males, aged 55 or over, as of 1985, were followed up for their cancer incidence. The cancer incidence rate, standardized incidence ratio and risk ratios were calculated according to ginseng intake. A Cox proportional hazard model was used to adjust for age at entry, smoking, alcohol intake, hypertension, and body mass index. Results & Conclusions : The ginseng intake group had the same cancer (C00-C97) incidences (Standardized Incidence Ratio: SIR=1.11, 95% Confidence Interval=0.97-1.27) and the same risk ratio (RR=1.09, 95% Confidence Interval=0.85-1.41) as the no-intake group. Analyzing the subjects that had followed up from 1990, however, the ginseng intake group had lower cancer incidences at all sites (RR=0.79, 95% Confidence Interval=0.58-1.09). This was a cohort study to try and evaluate the association between ginseng intake and the incidences of cancer, The results of this study provide no clear conclusions on the cancer preventive effects of ginseng. Therefore, further study is needed in the future.
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대향타겟식 스퍼터링 장치의 공정 조건에 따른 SiO<sub>2</sub> 가스 차단막의 특성
배강,왕태현,손선영,김화민,홍재석,Bae, Kang,Wang, Tae-Hyun,Sohn, Sun-Young,Kim, Hwa-Min,Hong, Jae-Suk 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7
For the silicon oxide $(SiO_x)$ films prepared by using the facing target sputtering (FTS) apparatus that was manufactured to enhance the preciseness of the fabricated thin-film and sputtering yield rate by forming a higher-density plasma in the electrical discharge space for using it as a thin-film passivation system for flexible organic light emitting devices (FOLEDs). The deposition characteristics were investigated under various process conditions, such as array of the cathode magnets, oxygen concentration$(O_2/Ar+O_2)$ introduced during deposition, and variations of distance between two targets and working pressure. We report that the optimum conditions for our FTS apparatus for the deposition of the $SiO_x$ films are as follows: $d_{TS}\;and\;d_{TT}$ are 90mm and 120mm, respectively and the maximum deposition rate is obtained under a gas pressure of 2 mTorr with an oxygen concentration of 3.3%. Under this optimum conditions, it was found that the $SiO_x$ film was grown with a very high deposition rate of $250{\AA}$/min by rf-power of $4.4W/cm^2$, which was significantly enhanced as compared with a deposition rate (${\sim}55{\AA})$/min) of the conventional sputtering system. We also reported that the FTS system is a suitable method for the high speed and the low temperature deposition, the plasma free deposition, and the mass-production.
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이상욱(Sang-Wook Yi),홍재석(Jae Suk Hong),오희철(Heechoul Ohrr) 고려인삼학회 2003 Journal of Ginseng Research Vol.27 No.4
Recently, there are much concerns about ginseng as disease therapeutics. There are no epidemiologic study on relationship between ginseng intake and all cause mortality based from general population Cohort. This study sought to examine relationships between ginseng intake and all cause mortality from Kangwha Cohort data. From March 1985 through December 1999, 2696 males and 3595 females who were aged 55 or over as of 1985 were followed up. We calculate the mortality rate, standardized mortality ratio and risk ratios by ginseng intake. Cox proportional hazard model was used to adjust various confounding factors. Ginseng intake group had the lower all cause mortality(Risk ratio(RR)=0.88, 95%Confidence Interval(CI)=0.79-0.97) among males. Increasing ginseng intake, lower all cause mortality(Low ginseng intake: RR=0.88, 95%CI=0.79-0.98; high ginseng intake : RR=0.87, 95%CI=0.75-1.00) among males. There is no statistically significant difference between ginseng<br/> intake and mortality among females. The results of this study suggests that ginseng intake may prolong the human life among males.
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