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Continuous Behavior of Using Food Delivery Mobile Applications in Vietnam after Covid-19 Pandemic
Ha Thu LUONG(Ha Thu LUONG ),Nhi Lan DAO(Nhi Lan DAO ),Trang Thu NGUYEN(Trang Thu NGUYEN ),Uyen Thu Thi LA(Uyen Thu Thi LA ),Na Thi Le TRAN(Na Thi Le TRAN ),Hoa Thi DUONG(Hoa Thi DUONG ) 한국유통과학회 2023 유통과학연구 Vol.21 No.3
Purpose: During and after Covid-19 pandemic, technology has emerged as a key factor in supporting the recovery of the economy and the rise of living standards. This study examines seven factors affecting the intention of food delivery apps usage, which include Performance Expectancy, Effort Expectancy, Social Influence, Hedonic Motivation, Price Value, and Habit, and how much influence they have on the customers' behavioral continuance of food delivery apps after Covid-19 Pandemic. Research methodology: This research is a quantitative descriptive research with 473 qualified respondents from 550 respondents collected. Besides using the UTAUT2 model (Venkatesh et al., 2012), Information Quality was added to give a better explanation for the consumers’ intention towards continuance behavior using food delivery apps. The collected data is then processed using SPSS 22.0. Results: Habit factors and Information Quality factors have significant positive effects on promoting food delivery apps usage intention, which in turn influences continuance behavior. In addition, Habit factors and Information Quality factors together have an effect of 48.57% on Behavioral Intention. Conclusion: The result proves that positive habits and food information quality can increase the usage intention towards the behavioral continuance of consumers. Higher usage frequency can be improved by increasing these two factors.
Uyen Thi, Phan Ngoc,Male, Umashankar,Huh, Do Sung Elsevier 2018 Polymer Vol.144 No.-
<P><B>Abstract</B></P> <P>Moth eye-like patterned poly(vinyl alcohol) (PVA) films selectively containing titanium dioxide (TiO<SUB>2</SUB>) nanoparticles in the microdome were fabricated using polystyrene honeycomb patterned porous film as a template in which TiO<SUB>2</SUB> nanoparticles are pore-filled. The template was prepared by in situ pore filling of TiO<SUB>2</SUB> nanoparticles by the modified breath figure method, wherein the hydrolysis of titanium butoxide was performed in the condensed water droplets as microreactors. The moth eye-like patterned PVA film selectively containing TiO<SUB>2</SUB> nanoparticles in the microdome was transparent almost similar to the pristine PVA flat film. However, the film showed a reversible photochromism that changes to blue color by UV illumination and recovered by visible light. The obtained films may have potential applications in anti-reflective surfaces, photo-catalytic surfaces, opto-electronics, and photo-catalytic devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First report on moth eye patterned films containing TiO<SUB>2</SUB> particles in microdomes. </LI> <LI> PVA were employed for the fabrication of moth eye patterned (MEP) films. </LI> <LI> MEP films were fabricated using honeycomb patterned porous films as templates. </LI> <LI> PVA/TiO<SUB>2</SUB> MEP films are transparent similar to PVA films and also show photochromism. </LI> <LI> These films can have great potential applications in opto-electronics. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Uyen Thi, Phan Ngoc,Male, Umashankar,Huh, Do Sung Elsevier 2018 Polymer Vol.147 No.-
<P><B>Abstract</B></P> <P>Poly (ε-caprolactone) honeycomb patterned porous films were selectively functionalized on the bottom surface with polypyrrole/silver (PPy/Ag) composite via <I>in situ</I> interfacial polymerization on a reactive substrate during the breath figure procedure. For the interfacial <I>in situ</I> polymerization, poly (ε-caprolactone) solution including pyrrole was cast on a reactive ice substrate. The reactive ice substrate contains aqueous methanesulfonic acid and silver nitrate as an oxidizing agent for the pyrrole monomer. FT-IR, EDX, UV-Visible, conductivity, and wetting measurements support the formation of PPy/Ag on the bottom surface of the films. Pore size, conductivity, and wettability increased with increased concentration of pyrrole. Films with different functionalization on either surfaces can be applied in various advanced applications such as flexible electrodes, tissue engineering, etc.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bottom functionalized patterned films were fabricated using reactive substrate. </LI> <LI> Breath figure process was performed on top surface. </LI> <LI> Interfacial polymerization was performed on bottom surface. </LI> <LI> Color, composition, wetting, conductivity are different on top and bottom surfaces. </LI> <LI> Films might have a great promising potential in advanced applications. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Le Thi Minh Uyen ),박수진 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
The application of large specific area-carbon fiber Si/CNFs to CO<sub>2</sub> capture was evaluated experimentally using simulated flue gas via thermal gravimetric analysis (TGA) at ambient pressure. The average adsorption capacity of CO<sub>2</sub> on the parent materials, affects as a function of the weight percent of polyethyleneimine (PEI) or amine groups decorated on the surface of Si/CNFs. The properties of carbon material were characterized by X-ray powder diffraction (XRD), XPS patterns and nitrogen adsorption/desorption isotherms. With a simulated flue gas (at 333 K) consisting of 15 vol% CO<sub>2</sub> (partial pressure 0.15 MPa), and the balance N<sub>2</sub>, the CO<sub>2</sub> capture efficiency during the adsorption breakthrough study was recorded. After adsorption, thermal regeneration that was applied at 373 K to recover the adsorbed gas.
Manganese oxide- loaded porous carbon nanofibers for carbon dioxide capture
( Le Thi Minh Uyen ),박수진 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Manganese oxide-loaded porous carbon nanofibers are prepared by electrospinning polyacrylonitrile nanofibers containing different amounts of Mn(CH<sub>3</sub>COO)<sub>2</sub>, followed by thermal treatments in different environments. It is found that the manganese salt may transform into γ-Mn(OOH)<sub>2</sub> or other Mn compounds during the thermal oxidation in air environment, while further thermal treatment in inert atmosphere results in MnO and Mn<sub>3</sub>O<sub>4</sub> particles confined to a nanoporous carbon structure. Surface morphology properties, element components and crystal structures are characterized using various analytical techniques via X-ray powder diffraction (XRD), elemental analysis (XPS), and nitrogen adsorption-desorption experiments. The CO<sub>2</sub> capture capacity of composite materials were investigated by thermal gravimetric analysis (TGA) at 60°C.
( Le Thi Minh Uyen ),박수진 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
The properties of ultra-microporous carbon synthesized by the pyrolysis of the mixture of poly(vinylidene fluoride) and manganese(II) salt as a function of the heat-treatment temperature were examined by nitrogen adsorption-desorption experiments at 77K. X-ray powder diffraction (XRD) and elemental analysis experiments were carried out to study the structural properties and the specific elements on surface of heat-treated carbons, respectively. Thermal gravimetric analysis (TGA) was carried out to investigate the carbon dioxide adsorption performance of these carbon materials at 60°C under the mixed gas stream containing 15% vol of CO<sub>2</sub> in N<sub>2</sub> gas.