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In-situ P doped epitaxial Si(1-x)C(x) growth under UHV-CVD.
Koo, Sangmo,Yoot, Jung-Ho,Kim, Sun-Wook,Ko, Dae-Hong American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.10
<P>Undoped and in-situ phosphorus-doped epitaxial Si1-xCx layers were grown on chemically cleaned Si (100) substrates by using a UHV-CVD process. The carbon concentrations of the epitaxial layers and growth temperatures were varied, and the effects of post annealing processes were then investigated. In the defect-free films, the carbon content in the Si1-xCx layer was analyzed to be about 1.2% by XRD measurement. About 20% loss of the substitutional carbon atoms occurred after annealing treatment at 1000 degrees C in N-2 ambient due to the transfer of the substititual carbon atoms to interstitial sites as well as the formation of the beta-SiC precipitates. The changes in microstructures were analyzed by the cross sectional transmission electron microscopy. The surface of the films shows partially polycrystalline structures in high PH3 flow rate, due to surface poisoning by phosphorus segregation. Fully a 100% substitutionality of carbon atoms in the epitaxial Si1-xCx film is achieved by the addition of PH3 and post annealing.</P>
Kim Kyung-Soo,Hong Sangmo,Han Kyungdo,박철영 한국지질동맥경화학회 2022 지질·동맥경화학회지 Vol.11 No.1
Objective To validate the criteria for the extreme risk category for atherosclerotic cardiovascular disease (ASCVD). Methods An observational cohort study of 35,464 individuals with established ASCVD was performed using the National Health Information Database. Incident myocardial infarction (MI), ischemic stroke, and death in patients with established ASCVD was investigated to validate the criteria for the extreme risk category of ASCVD defined as the presence of diabetes mellitus (DM), chronic kidney disease (CKD), and history of premature ASCVD. Results Among 35,464 patients, 77.97% of them were classified into the extreme risk group of ASCVD. A total of 28.10%, 39.61%, and 32.12% had DM, CKD, and a history of premature ASCVD, respectively. During a mean follow-up of 8.39 years, MI, ischemic stroke, and all-cause death were found in 3.87%, 8.51%, and 23.98% of participants, respectively. In multivariate analysis, patients with DM had higher risk for MI (hazard ratio [HR], 1.62; 95% confidence interval [CI], 1.45–1.81), ischemic stroke (HR, 1.39; 95% CI, 1.29–1.50), and all-cause death (HR, 1.52; 95% CI, 1.45–1.59) than those without DM. Patients with CKD had 1.56 times higher risk for MI, 1.12 times higher risk for ischemic stroke, and 1.34 times higher risk for death than those without CKD. However, the risk for MI, ischemic stroke, and all-cause death was not different between patients with and without a history of premature ASCVD. Conclusion DM and CKD, but not a history of premature ASCVD, could be considered as reasonable criteria of an extreme risk for ASCVD.
Filipino women’s diet and health study (FiLWHEL)
Grace P. Abris,Sangmo Hong,Sherlyn Mae P. Provido,Jung Eun Lee,Chang Beom Lee 대한지역사회영양학회 2017 Nutrition Research and Practice Vol.11 No.1
BACKGROUND: Immigration to South Korea from neighboring Asian countries has risen dramatically, primarily due to marriage between Korean men and foreign women. Although Filipino women rank fourth among married immigrant women, little is known about the health condition of this population. This manuscript focuses on the design and methods of Filipino women"s diet and health study (FiLWHEL). SUBJECTS/METHODS: FiLWHEL is a cohort of Filipino women married to Korean men, aged 19 years old or over. The data collection comprised three parts: questionnaire, physical examination, and biospecimen collection. Questionnaires focused on demographic factors, diet, other health-related behaviors, acculturation and immigration-related factors, medical history, quality of life, and children’s health information. Participants visited the recruitment site and answered the structured questionnaires through a face-to-face interview. We also measured their anthropometric features and collected fasting blood samples, toenails, and DNA samples. Recruitment started in 2014. RESULTS/CONCLUSIONS: Collection of data is ongoing, and we plan to prospectively follow our cohort participants. We expect that our study, which is focused on married Filipino women immigrants, can elucidate nutritional/health status and the effects of transitional experiences from several lifestyle factors.
Sherlyn Mae P. Provido,Grace P. Abris,Sangmo Hong,Sung Hoon Yu,Chang Beom Lee,Jung Eun Lee 한국영양학회 2020 Nutrition Research and Practice Vol.14 No.1
BACKGROUND/OBJECTIVES: Few epidemiological studies examined the association between fried food intake and hypertension. This study examined whether fried food intake was associated with higher prevalence of prehypertension and hypertension combined in a cross-sectional study of the Filipino Women’s Diet and Health Study (FiLWHEL). SUBJECTS/METHODS: This study included a total of 428 women aged 20-57 years who have ever been married to Korean men. Prehypertension was defined as 120 - < 140 ㎜Hg of SBP or 80 - < 90 ㎜Hg of DBP and hypertension as SBP ≥ 140 ㎜Hg or DBP ≥ 90 ㎜Hg. Fried food intake was assessed using one-day 24-hour recall. Fried foods were categorized into total, deep/shallow and pan/stir fried foods. The odds ratio (OR)s and 95% confidence interval (CI)s were calculated using multivariate logistic regression. RESULTS: The prevalence of prehypertension and hypertension combined was 41.36% in this population. High fried food intake was associated with high prevalence of prehypertension and hypertension combined. The odds of having prehypertension and hypertension was higher in the 3rd tertile of fried food intake among fried food consumers compared to non-fried food consumers (OR = 2.46, 95% CI = 1.24, 4.87; P for trend = 0.004). Separate analysis for types of frying showed that deep and shallow fried food intake was associated with prevalence of prehypertension and hypertension combined for comparing the 3rd tertile vs. non-fried food consumers (OR = 2.93; 95% CI = 1.57-5.47; P for trend = < 0.001). CONCLUSIONS: This study showed the evidence that high fried food intake was significantly associated with high prevalence of prehypertension and hypertension combined among Filipino women married to Korean men.
Jang, Hyunchul,Kim, Byongju,Koo, Sangmo,Ko, Dae-Hong Institute of Physics 2017 Semiconductor science and technology Vol.32 No.11
<P>We have selectively grown an epitaxial Si<SUB>0.35</SUB>Ge<SUB>0.65</SUB> fin layer in a 65 nm oxide trench pattern array and formed a Ge-rich Si<SUB>1−<I>x</I></SUB>Ge<SUB><I>x</I></SUB> (<I>x</I>?>?0.9) fin layer with condensed Ge using dry oxidation. During oxidation of the SiGe fin structure, we found that the compressive strain of the condensed SiGe layer was increased by about 1.3% while Ge was efficiently condensed due to a two-dimensional oxidation reaction. In this paper, we discussed in detail the diffusion during the two-dimensional condensation reaction as well as the asymmetric biaxial strain of the SiGe fin before and after oxidation using a reciprocal space mapping measurement. The application of dry oxidation on selectively grown SiGe fin layer can be an effective method for increasing hole mobility of SiGe fin with increased Ge content and self-induced compressive strain.</P>