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Mo 화학기상증착에 있어서 불순물 농도에 미치는 증착조건의 영향
배상석,서성교,홍은식,김승모,조미정,한혜정,이두성,김세훈,민석홍 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-
The thermal decomposition process of Mo(CO)_6 on chemical vapor deposition was investigated by analyzing the effects of deposition temperature, pressure, and reaction gas on the phase change of deposited films. Mo_2C was deposited at or below 350℃ due to the incompleteness of thermal decomposition of Mo(CO)_6, but Mo films was successfully deposited at 400℃ or higher temperatures. The variation of deposition pressure did not change the dependence of decomposition process on deposition temperature. The activation energy of surface reaction was 5.8 ㎉/mole.
( Seok Kyo Seo ),( Bo Hyon Yun ),( Eun Bee Noe ),( Jong Wook Suh ),( Young Sik Choi ),( Byung Seok Lee ) 대한산부인과학회 2015 Obstetrics & Gynecology Science Vol.58 No.2
Objective This study aimed to assess the association between bone mineral density (BMD) and coronary atherosclerosis in healthy postmenopausal women. Methods We performed a retrospective review of 252 postmenopausal women who had visited a health promotion center for a routine checkup. BMD of the lumbar spine (L1.L4) and femoral neck was evaluated using dual-energy X-ray absorptiometry, and coronary atherosclerosis was assessed using 64-row multidetector computed tomography. Participants were divided into normal BMD and osteopenia-osteoporosis groups, according to the T-scores of their lumbar spine or femoral neck. Results Participants with osteopenia-osteoporosis had a significantly higher proportion of coronary atherosclerosis than did those with normal BMD at the lumbar spine (P=0.003) and femoral neck (P=0.004). Osteopenia-osteoporosis at the lumbar spine (odds ratio [OR], 2.86; 95% confidence interval [CI], 1.12 to 7.27) or femoral neck (OR, 3.35; 95% CI, 1.07 to 10.57) was associated with coronary atherosclerosis, after controlling for age and cardiovascular risk factors. Conclusion Decreased BMD is associated with coronary atherosclerosis in healthy postmenopausal women, independent of age and cardiovascular risk factors. Postmenopausal women with decreased BMD may have a higher risk of developing coronary atherosclerosis.
Relationship between Leukoaraiosis and metabolic syndrome in healthy postmenopausal women(초)
서석교 ( Seok Kyo Seo ),( Sang Min Lee ),( Hyo In Yang ),( Kyung Eun Lee ),( Hye Yeon Kim ),( Si Hyun Cho ),( Young Sik Choi ),( Ki Hyun Park ),( Dong Jae Cho ),( Byung Seok Lee ) 대한산부인과학회 2009 대한산부인과학회 학술대회 Vol.95 No.-
수도권 지역 대기 중 카보닐화합물의 시ㆍ공간적 농도 분포 특성
서영교(Young-Kyo Seo),정은희(Eun-Hui Jeong),서석준(Seok-Jun Seo),황윤정(Yun-Jeong Hwang),한진석(Jin-Seok Han),백성옥(Sung-Ok Baek) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.2
The purpose of this study is to evaluate concentrations of carbonyl compounds during summer season in Seoul metropolitan area. The air samples were collected at 7 sites in this area from June 2001 to June 2003. The carbonyl compounds were analyzed by DNPH/HPLC method. The analytical method applied in this study showed good repeatability, linearity, and sensitivity. The most abundant carbonyl was formaldehyde (average 4.48 ppb), and followed by acetone, acetaldehyde, methyl ethyl ketone, butyraldehyde, propionaldehyde and benzaldehyde, respectively. Concentrations of carbonyl compounds in June were higher than those in August. There was not only higher solar radiation but also higher ozone concentration in June than in August. As a result of photochemical reactions, carbonyl compounds from both primary and secondary sources are likely to contribute to the formation of ozone. The contributions to photochemical ozone creation of two carbonyl compounds such as formaldehyde and acetaldehyde were estimated to be about 70%. Ratios of formaldehyde to acetaldehyde in this study ranged from 1.13 to 4.26, which are generally equivalent levels to those of other urban areas in domestic and foreign countries.