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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.
Small polyanion recognition of a triazolium cyclodextrin click cluster in water
Le, Hoa Thi,Park, Seung Cheol,Kang, Chulhun,Lim, Choon Woo,Kim, Tae Woo The Royal Society of Chemistry 2015 Organic & biomolecular chemistry Vol.13 No.30
<P>In order to detect small polyanions (sPAs), which play important roles in many biological systems, a triazolium cyclodextrin click cluster (<B>5</B>, hexakis{6-(3-methyl-4-hydroxymethyl-1<I>H</I>-1,2,3-triazolium-1-yl)-6-deoxy}-α-cyclodextrin iodide) was synthesized and characterized. The competition binding to <B>5</B> occupied by 5-carboxyfluorescein of inositol-1,4,5-trisphosphate (IP<SUB>3</SUB>), phytic acid, adenosine triphosphate (ATP), ethylenediaminetetraacetic acid (EDTA), glucose, and glucose-6-phosphate was evaluated by UV/vis titration in HEPES (10 mM, pH 7.4) : methanol (1 : 1, v/v). We obtained the binding constants of IP<SUB>3</SUB> and phytic acid to <B>5</B> (1.4 × 10<SUP>6</SUP> and 1.9 × 10<SUP>6</SUP> M<SUP>−1</SUP>, respectively); however, the binding constants of ATP and EDTA were significantly lower (2.1 × 10<SUP>5</SUP> and 4.5 × 10<SUP>4</SUP> M<SUP>−1</SUP>, respectively). Moreover, glucose and glucose-6-phosphate did not show any detectable binding. In addition, the sPA recognition of the triazolium cyclodextrin click cluster in water was confirmed by fluorescence titration.</P> <P>Graphic Abstract</P><P>In order to detect small polyanions (sPAs), which play important roles in many biological systems, a triazolium cyclodextrin click cluster was synthesized and its sPA binding properties were characterized. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5ob00999e'> </P>
Thi Hoa Le,안용남,박상준 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
Cysteine (Cys) is a crucial amino acid. Developing a method for Cys evaluation and detection is necessaryfor the diagnosis of various diseases. A variety of sensors use graphene quantum dots (GQDs) for biological compounddetermination; however, GQDs demonstrate very poor fluorescence quantum yield. Therefore, we doped nitrogenand phosphorus into GQDs to form composite material NP-GQDs with enhanced fluorescence properties. NPGQDswere characterized by ultraviolet-visible, fluorescence spectroscopy, transmission electron microscopy, and X-rayphotoelectron spectroscopy. Then, we used NP-GQDs as donors and silver nanoparticles (AgNPs) as acceptors todesign a fluorescence resonance energy transfer (FRET) system for Cys detection. Optimal conditions for sensing wereinvestigated, and under these conditions our FRET system showed good results in Cys determination. The fluorescenceintensity of NP-GQDs was quenched proportionally along with increasing Cys concentration from 0.5 to 4.5 Mand the limit of detection (LOD) was 0.1 M. In the presence of different amino acids, the FRET system also showedexcellent selectivity for the Cys detection.
Le Thi Mai Hoa,Dang Mau Chien,Kozo Ishizaki 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.6
The amorphous Fe73.5 Cu₁Nb₃Si₁₃.5B9 alloy was prepared by using a rapid solidification technique. The rapidly quenched alloy was annealed in various temperatures for 60 minutes. This annealing process made a series of partially crystallized samples with different crystallization fractions. The formation of the nanoparticles was observed by using transmission electron microscopy (TEM). The phases and the compositions were identifed by using X-ray diffraction (XRD). The microstructure of the annealed samples was composed of nanocrystalline Fe$_3$Si grains surrounded by a residual amorphous phase. The crystallization fraction of the samples was determined by using two methods: cryogenic heat capacity (CHC) and differential scanning calorimetry (DSC) measurements. The first method is a new method and allowed small changes in the amount of the crystalline phase to be determined. There was a difference of about 3 \% between the CHC and the DSC values. The amorphous Fe73.5 Cu₁Nb₃Si₁₃.5B9 alloy was prepared by using a rapid solidification technique. The rapidly quenched alloy was annealed in various temperatures for 60 minutes. This annealing process made a series of partially crystallized samples with different crystallization fractions. The formation of the nanoparticles was observed by using transmission electron microscopy (TEM). The phases and the compositions were identifed by using X-ray diffraction (XRD). The microstructure of the annealed samples was composed of nanocrystalline Fe$_3$Si grains surrounded by a residual amorphous phase. The crystallization fraction of the samples was determined by using two methods: cryogenic heat capacity (CHC) and differential scanning calorimetry (DSC) measurements. The first method is a new method and allowed small changes in the amount of the crystalline phase to be determined. There was a difference of about 3 \% between the CHC and the DSC values.
Synthesis of enhanced fluorescent graphene quantum dots for catecholamine neurotransmitter sensing
Thi Hoa Le,이달호,김지현,박상준 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.6
We employed polypyrrole/graphene quantum dot (PPy/GQD) composites as a sensor for the simple and selective detection of catecholamine neurotransmitters (CNs), such as dopamine (DA), epinephrine (EP), norepinephrine (NE), which play vital roles in the peripheral and central nervous systems. The PPy/GQD composites showed strong fluorescence emission, which was significantly increased, by as much as greater than three times, compared to that of the pristine GQDs. In neutral solution, the CNs on the surface of the PPy/GQD composites were converted into a quinone structure, which triggered the fluorescence quenching of the PPy/GQD composites via a photo-induced electron transfer process. The CN concentration could be effectively monitored based on the quenching of the fluorescence signal of the PPy/GQDs. The quenching effect of DA is the fastest and most effective, followed by those of EP and NE, respectively, and the quenched fluorescence intensity of the PPy/GQDs was proportional to the concentration of DA (0.007-250 M), EP (0.7-250 M), and NE (5-500 M). The present system was used for the quantification of CNs in human serum samples with acceptable results.
Le Thi Thuy Lien,Nguyen Khoi Viet,Hoang Van Hoa,Phung Bao Ngoc,Nguyen Ngoc Trang,Vu Thi Kim Thoa,Nguyen Cong Tien,Phan Anh Phuong,Pham Minh Thong,Vu Dang Luu 아시아심장혈관영상의학회 2022 Cardiovascular Imaging Asia Vol.6 No.2
Objective: To compare left ventricular (LV) function, ejection fraction (EF), end-diastolic volume (EDV), end-systolic volume (ESV), and regional wall motion analyzed in 256-slice dualsource coronary CT angiography (DSCT) with 2D transthoracic echocardiography (TTE). Materials and Methods: One hundred twelve patients suspected of coronary artery disease underwent DSCT and 2D-TTE within one week for LVEF, EDV, and ESV. The correlation between DSCT and 2D-TTE measurements was analyzed through linear regression and Bland- Altman analysis. Regional wall motion was visually scored with a 3-point scale (1, normal; 2, hypokinesia; 3, dysphagia, akinesia). Results: Average LVEF at 66.45%±1.27% (range 23%–85%) as determined on DSCT compared with 66.09%±1.01% (range 25%–84%) on 2D-TTE. LVEF exhibited a good correlation between DSCT and 2D-TTE (r=0.715; p<0.001). Good correlations between DSCT and 2D-TTE were demonstrated for LVEDV (r=0.732; p<0.001) and LVESV (r=0.841; p<0.001). Mean differences (±SD) of 1.78±24.10 mL (p<0.05) and 0.77±13.70 mL (p<0.05) were observed between DSCT and 2D-TTE for LVEDV and LVESV, respectively. LVEF was slightly overestimated with DSCT (0.52%±9.59%; p<0.05). Although the LVEF values calculated by DSCT and 2D-TTE were similar, EDV and ESV from DSCT were statistically higher than those from 2D-TTE (p<0.05). Agreement between DSCT and 2D-TTE in regional wall motion was 96.4%, κ=0.840. Conclusion: DSCT can provide comparable results to those using 2D-TTE for LV function (EF, EDV, and ESV) and regional wall motion assessment in a heterogeneous population.