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민용기,박영태 계명대학교 자연과학연구소 2022 Quantitative Bio-Science Vol.41 No.1
Co-oligomerizations of 2,6-dilithio-4,4-diisopropyl- or -diphenyl-dithieno[3,2-b:2′,3′-d]siloles, which were prepared in situ via n-butyllithium treatment of 2,6-dibromo-4,4-diisopropyl- or -diphenyl-dithieno[3,2-b:2′,3′-d]siloles (V or VI), with dichlorodiisopropylsilane or dichlorodiphenylsilane yielded the novel oligomers oligo[(4,4-disubstituted-2,6- dithieno[3,2-b:2′,3′-d]silolene)-alt-(disubstituted silylene)]s VII-X as blue-greenish viscous liquids. These oligomers were characterized using several spectroscopic methods, such as 1H and 13C nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy, photophysical properties, and thermal stabilities, along with density functional theory (DFT) calculations. The absorption spectra of VII, VIII, and X, in particular, revealed partial delocalization over the oligomer backbones in comparison with those of the monomers V and VI, which was consistent with the highest occupied molecular orbital-lowest unoccupied molecular orbital energy trends calculated using DFT. VII-X were generally stable up to 150°C, with the less than 4% loss of the original mass.
민용기,이동윤,윤병구,박윤수,문영완,임승재,이영균,최두석 대한골대사학회 2015 대한골대사학회지 Vol.22 No.3
Background: Recently, a Korean fracture-risk assessment tool (FRAX) model has become available, but large prospective cohort studies, which are needed to validate the model, are still lacking, and there has been little effort to evaluate its usefulness. This study evaluated the clinical usefulness of the FRAX model, a FRAX developed by the World Health Organization, in Korea. Methods: In 405 postmenopausal women and 139 men with a proximal femoral fracture, 10-year predicted fracture probabilities calculated by the Korean FRAX model (a country-specific model) were compared with the probabilities calculated with a FRAX model for Japan, which has a similar ethnic background (surrogate model). Results: The 10-year probabilities of major osteoporotic and hip fractures calculated by the Korean model were significantly lower than those calculated by the Japanese model in women and men. The fracture probabilities calculated by each model increased significantly with age in both sexes. In patients aged 70 or older, however, there was a significant difference between the two models. In addition, the Korean model led to lower probabilities for major osteoporotic fracture and hip fracture in women when BMD was excluded from the model than when it was included. Conclusions: The 10-year fracture probabilities calculated with FRAX models might differ between country-specific and surrogate models, and caution is needed when applying a surrogate model to a new population. A large prospective study is warranted to validate the country-specific Korean model in the general population.