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Interdependence between Manufacturing and Service Foreign Direct Investments of Korea
Yuehong Hao,Jung Hur 한국경제연구학회 2017 Korea and the World Economy Vol.18 No.2
In a view of constructing global value chains, this study attempts to examine interdependence between the outbound FDIs of the Korean manufacturing and producer service sectors, using panel data from 1996 to 2012. We find that (i) a presence of manufacturing FDIs has a positive effect on new investments in producer service sectors, and (ii) a presence of producer service FDIs also has a positive effect on new investments in manufacturing sectors. Our empirical results imply that Korean multinational firms are expanding their role as headquarter service providers in the world through both manufacturing plants and regional business service subsidiaries.
Aqueous Synthesis and Photocatalytic Performance of Bi5O7I Microflowers
Yuehong Song,Xinli Hao,Weili Dai,Jingzhe Zhao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
Bi5O7I microflowers were synthesized through a simple liquid coprecipitation under alkaline condition at 75 ℃ in an open system without using autoclave or other complex equipment. The addition of NaBr was a key factor for controlling the morphology of Bi5O7I. The assembled Bi5O7I samples are constructed by elementary nanowires, which were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffuse reflection spectroscopy (UV-Vis DRS) methods. The photocatalytic performance of Bi5O7I samples on rhodamine B (RhB), methylene blue (MB) and ciprofloxacin (CIP) was evaluated under 350 W xenon lamp irradiation. On comparison with the blank Bi5O7I microflowers, Bi5O7I microflowers with NaBr addition exhibited better photocatalytic performance, and the photocatalytic activity enhanced with the increase of NaBr amount. The photocatalytic efficiency reached 81.1% in 150 min for RhB, 42.5% in 210 min for MB and 56.3% in 210 min for CIP in the degradation system at pH = 7 without any assistant agent. Trapping experiments were performed to reveal the degradation mechanism of Bi5O7I samples. It was proposed that valid separation of photogenerated electrons and holes in Bi5O7I microflowers led to good catalytic properties.