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정은애,Young Tae Park 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.6
Melt copolymerization reactions of several bis(diethylamino)silane derivatives, bis(diethylamino)methylphenylsilane, bis(diethylamino)methyloctylsilane, 1,2-bis(diethylamino)tetramethyldisilane, and 1,3-bis(diethylamino) tetramethyldisiloxane, with 2,7-dihydroxyfluoren-9-one were carried out to yield poly[oxy(2,7-fluoren- 9-onenylene)oxy(diorganosilylene)]s bearing the fluoren-9-one fluorescent aromatic group in the polymer main chain: poly[oxy(2,7-fluoren-9-onenylene)oxy(methylphenylsilylene)], poly[oxy(2,7-fluoren-9-onenylene) oxy(methyloctylsilylene)], poly[oxy(2,7-fluoren-9-onenylene)oxy(tetramethyldisilylene)], and poly[oxy- (2,7-fluoren-9-onenylene)oxy(tetramethyldisiloxanylene)]. These polymeric materials are soluble in common organic solvents such as CHCl3 and THF. FTIR spectra of all the materials reveal characteristic Si-O-C stretching frequencies at 1012-1018 cm−1. In the THF solution, the prepared materials show strong maximum absorption peaks at 258-270 nm, strong maximum excitation peaks at 260-280 nm, and strong maximum fluorescence emission bands at 310-420 nm. TGA thermograms suggest that most of the polymers are essentially stable to 200 °C without any weight loss and up to 300 °C with only a weight loss of less than 5% in nitrogen.
정은애,이철성,박재성 신용보증기금 2021 중소기업금융연구=Journal of SME finance Vol.41 No.4
This study seeks the direction of financial support for self-employment as a specialized financial support area from an ecological perspective by establishing the components of the self-employment ecosystem and analyzing their relationships. Competition factors, business environment factors, social safety net factors, and performance factors are set as major factors in the self-employment ecosystem, and the relationship between each factor is analyzed through a path analysis model. The analysis results are as follows. Although General Merchandise Retailer(GMS) and Transaction value of online shopping establishment, which are factors of competition, had a negative (-) effect on self-employment sales, the number of franchise headquarters was found to be insignificant. It was found that the land price index, a business environment factor, increases sales of self-employment (+), while labor costs and employment insurance, which are social safety net factors, increase the number of non-wage workers (+). Among the performance factors, it was found that an increase in self-employment sales increases (+) the startup rate, but an increase in the start-up rate decreases (-) self-employment sales. In addition, it was found that an increase in the startup rate increases the number of non-wage workers (+), and the land price index decreases financial costs (-). The effect of self-employment sales on financial expenses was not significant, and it was found that an increase in financial expenses decreased (-) the number of non-wage workers. The policy implications of the analysis results are as follows. First, since the relationship between self-employment sales and financial support is not clear, it is necessary to closely examine the direction of financial support for self-employment support. Second, it is necessary to approach financial support from a social point of view linked to employment. Third, it is necessary to develop specialized financial indicators considering the characteristics of the self-employment ecosystem.