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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.
Determinants Influencing Housing-Option Decision of Gen Y: The Case of Vietnam
Ha Thu LUONG(Ha Thu LUONG ),Dung Manh TRAN(Dung Manh TRAN ),Dan Linh Ngoc NGUYEN(Dan Linh Ngoc NGUYEN ),Van Bao NGUYEN(Van Bao NGUYEN ),Anh Thuc LE(Anh Thuc LE ),Hieu Van PHAM(Hieu Van PHAM ) 한국유통과학회 2023 유통과학연구 Vol.21 No.7
Helix Nucleation via Hydrocarbon Cross-link Mimicking N-capping Box
Luong Thuy Nguyen,Huy Xuan Luong,김영우 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.4
The N-capping box is a well-known helix-stabilizing motif with a distinct reciprocal backbone–side chain hydrogen-bonding arrangement at the N-terminus of helices. This unique N-terminal flanking motif consists of a hydrogen-bonded cycle of four amino acid residues in which the backbone amide of the N3 residue forms a hydrogen bond with the side chain of the Ncap residue, and reciprocally, the side chain of the N3 accepts a hydrogen from the Ncap amide. In this study, as a new helix-stabilizing strategy, we examined a metathesis-based cross-linking system that mimics the hydrogen bond between the Ncap amide and the side chain of the N3 at the N-terminus. Using this new system, we prepared two alanine/lysine-based model peptides and analyzed its impact on helix stabilization. We found that a 16-membered macrocycle incorporated by ring-closing metathesis effectively induces and stabilizes helical conformations of the given model sequence.
Two new species of Camellia (Theaceae) from Vietnam
Lieu Thi Nguyen,Ninh Tran,Uematsu CHIYOMI,Katayama HIRONORI,Dung Van Luong,Son Thanh Hoang,Ky Danh NGUYEN,Hung Viet NGUYEN,Toan Canh THAI 한국식물분류학회 2018 식물 분류학회지 Vol.48 No.2
Two new species of Camellia (Theaceae) are described from Vietnam: Camellia vuquangensis Luong, Tran & L. T. Nguyen and Camellia hatinhensis Luong, Tran & L. T. Nguyen. The new taxa were col- lected from Vu Quang National Park in the center of Vietnam. The new finds are morphologically dissimilar to all known Camellia species. Recent Camellia discoveries have increased the number of species recorded in Viet- nam from 50 to 75, making Vietnam a center of diversity and a crucial area for more research into the diversity and distributions of Camellia.
Luong, Nguyen Dang,Oh, Joonsuk,Lee, Youngkwan,Yeon, Ji Hyun,Hur, Jaehuyn,Park, Jong Jin,Kim, Jong Min,Nam, Jae‐,Do John Wiley Sons, Ltd 2012 Surface and interface analysis Vol.44 No.3
<P>In this study, the surface plasmon effect of Au nanoparticles was successfully realized in the solid state by embedding the Au nanoparticles on the surface of the transparent polymer fibers for the first time. Electrospinning a poly(methyl methacrylate) (PMMA) and HAuCl<SUB>4</SUB> mixture followed by a wet chemical reduction, the gold nanoparticles were formed on the PMMA nanocomposite electrospun fibers in a well‐distributed manner to give photostable purple color. The Au nanoparticles were all sphere shaped with an average diameter of 12 nm. Specifically, simply adjusting HAuCl<SUB>4</SUB> salt concentration in the electrospinning solution, it is able to control the electrospun fiber diameter and gold nanoparticle content in the resulting PMMA/Au nanocomposite fibers. Therefore, the developed method described herein is simple and effective for the large volume production of PMMA/Au nanocomposite fibers. Copyright © 2011 John Wiley & Sons, Ltd.</P>
Luong, Minh Bau,Sankaran, Ramanan,Yu, Gwang Hyeon,Chung, Suk Ho,Yoo, Chun Sang Elsevier 2017 Combustion and Flame Vol.183 No.-
<P><B>Abstract</B></P> <P>The ignition characteristics of lean primary reference fuel (PRF)/air/exhaust gas recirculation (EGR) mixture under reactivity-controlled compression ignition (RCCI) and direct duel fuel stratification (DDFS) conditions are investigated by 2-D direct numerical simulations (DNSs) with a 116-species reduced chemistry of the PRF oxidation. The 2-D DNSs of the DDFS combustion are performed by varying the injection timing of <I>iso</I>-octane (<I>i</I>-C<SUB>8</SUB>H<SUB>18</SUB>) with a pseudo-<I>iso</I>-octane (PC<SUB>8</SUB>H<SUB>18</SUB>) model together with a novel compression heating model to account for the compression heating and expansion cooling effects of the piston motion in an engine cylinder. The PC<SUB>8</SUB>H<SUB>18</SUB> model is newly developed to mimic the timing, duration, and cooling effects of the direct injection of <I>i</I>-C<SUB>8</SUB>H<SUB>18</SUB> onto a premixed background charge of PRF/air/EGR mixture with composition inhomogeneities. It is found that the RCCI combustion exhibits a very high peak heat release rate (HRR) with a short combustion duration due to the predominance of the spontaneous ignition mode of combustion. However, the DDFS combustion has much lower peak HRR and longer combustion duration regardless of the fuel injection timing compared to those of the RCCI combustion, which is primarily attributed to the sequential injection of <I>i</I>-C<SUB>8</SUB>H<SUB>18</SUB>. It is also found that the ignition delay of the DDFS combustion features a non-monotonic behavior with increasing fuel-injection timing due to the different effect of fuel evaporation on the low-, intermediate-, and high-temperature chemistry of the PRF oxidation. The budget and Damköhler number analyses verify that although a mixed combustion mode of deflagration and spontaneous ignition exists during the early phase of the DDFS combustion, the spontaneous ignition becomes predominant during the main combustion, and hence, the spread-out of heat release rate in the DDFS combustion is mainly governed by the direct injection process of <I>i</I>-C<SUB>8</SUB>H<SUB>18</SUB>. Finally, a misfire is observed for the DDFS combustion when the direct injection of <I>i</I>-C<SUB>8</SUB>H<SUB>18</SUB> occurs during the intermediate-temperature chemistry (ITC) regime between the first- and second-stage ignition. This is because the temperature drop induced by the direct injection of <I>i</I>-C<SUB>8</SUB>H<SUB>18</SUB> impedes the main ITC reactions, and hence, the main combustion fails to occur.</P>