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How Does Live Commerce Affect Customers?: An IT affordance perspective
Eunji Choi,Seongmin Jeon 한국경영정보학회 2021 한국경영정보학회 학술대회논문집 Vol.2021 No.11
The development of technology and media and the pursuit of non-face-to-face communication due to the COVID-19 pandemic have increased the influence of live commerce, a real-time streaming shopping channel. This study built a theoretical model of IT affordance (visibility, guidance shopping, trading, and meta-voicing), and it conducted an empirical analysis on how live commerce affects engagement with customers in South Korea through survey data on 428 individuals who have used live commerce. In addition, this study performed four types of scenario experiments on whether social cues and engagement influence customer engagement. Hence, this study verified the importance of understanding the meaning of IT affordance for live commerce.
Choi, Eunji,Cho, Eun-Bum,Jaroniec, Mietek The Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.40
<P>Periodic mesoporous organosilicas were prepared using 1,2-bis(triethoxysilyl)ethane (BTEE) in the presence of a poly(ethylene oxide)-<I>b</I>-poly(d,l-lactic acid-<I>co</I>-glycolic acid)-<I>b</I>-poly(ethylene oxide) triblock copolymer (LGE538) template under strongly and weakly acidic conditions. White solid powders were obtained even under weakly acidic conditions using iron chloride hexahydrate. Small angle X-ray scattering (SAXS) and nitrogen adsorption isotherms showed a highly ordered hexagonal (<I>p</I>6<I>mm</I>) mesostructure and a high specific surface area of around 1000 m<SUP>2</SUP>g<SUP>−1</SUP>. The hydrothermal stability of these materials was also investigated because it is a crucial factor in their usage in the chemical industry. The powders were placed in sealed vials inside a convection oven at 373 K for 4 weeks. The hydrothermally treated samples were analyzed every week over the 4 weeks using SAXS and nitrogen adsorption. Solid-state<SUP>29</SUP>Si CP-MAS NMR analysis was also performed to observe the stability of siloxane bonds over the 4 weeks of hydrothermal treatment. The results indicate that the ethane-silica samples show quite good stability, which makes them attractive as catalysts or supporting materials for up to one month.</P>
Eunji Lee,Soon Hyung Kwon,Poo Reum Choi,Ji Chul Jung,Myung-Soo Kim 한국탄소학회 2015 Carbon Letters Vol.16 No.2
Activated carbons (ACs) were prepared by activation of coal tar pitch (CTP) in the range of 700°C-1000°C for 1-4 h using potassium hydroxide (KOH) powder as the activation agent. The optimal activation conditions were determined to be a CTP/KOH ratio of 1:4, activation temperature of 900°C, and activation time of 3 h. The obtained ACs showed increased pore size distribution in the range of 1 to 2 nm and the highest specific capacitance of 122 F/g in a two-electrode system with an organic electrolyte, as measured by a charge-discharge method in the voltage range of 0-2.7 V. In order to improve the performance of the electric double-layer capacitor electrode, various mixtures of CTP and petroleum pitch (PP) were activated at the optimal activation conditions previously determined for CTP. Although the specific capacitance of AC electrodes prepared from CTP only and the mixtures of CTP and PP was not significantly different at a current density of 1 A/g, the AC electrodes from CTP and PP mixtures showed outstanding specific capacitance at higher current rates. In particular, CTP-PP61 (6:1 mixture) had the highest specific capacitance of 132 F/g, and the specific capacitance remained above 90% at a high current density of 3 A/g. It was found that the high specific capacitance could be attributed to the increased micro-pore volume of ACs with pore sizes from 1 to 2 nm, and the high power density could be attributed to the increased meso-pore volume.
Choi, Eunji,Oh, Jungju,Lee, Dahee,Lee, Jaewon,Tan, Xiaonan,Kim, Minkyung,Kim, Gyeungyun,Piao, Chunxian,Lee, Minhyung Elsevier 2018 Journal of controlled release Vol.279 No.-
<P><B>Abstract</B></P> <P>The receptor for advanced glycation end-products (RAGE) is involved in tumor angiogenesis. Inhibition of RAGE might be an effective anti-angiogenic therapy for cancer. In this study, a cationic RAGE-binding peptide (RBP) was produced as an antagonist of RAGE, and a ternary-complex consisting of RBP, polyethylenimine (2 kDa, PEI2k), and a suicide gene (pHSVtk) was developed as a gene delivery system with dual functions: the anti-tumor effect of pHSVtk and anti-angiogenic effect of RBP. As an antagonist of RAGE, RBP decreased the secretion of vascular-endothelial growth factor (VEGF) in activated macrophages and reduced the tube-formation of endothelial cells <I>in vitro</I>. In <I>in vitro</I> transfection assays, the RBP/PEI2k/plasmid DNA (pDNA) ternary-complex had higher transfection efficiency than the PEI2k/pDNA binary-complex. In an intracranial glioblastoma animal model, the RBP/PEI2k/pHSVtk ternary-complex reduced α-smooth muscle actin expression, suggesting that the complex has an anti-angiogenic effect. In addition, the ternary-complex had higher pHSVtk delivery efficiency than the PEI2k/pHSVtk and PEI25k/pHSVtk binary-complexes in an animal model. As a result, the ternary-complex induced apoptosis and reduced tumor volume more effectively than the PEI2k/pHSVtk and PEI25k/pHSVtk binary-complexes. In conclusion, due to its dual anti-tumor and anti-angiogenesis effects, the RBP/PEI2k/pHSVtk ternary-complex might be an efficient gene delivery system for the treatment of glioblastoma.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>