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Le Thai Nam,Dao Duy Thang 한국유통과학회 2017 한국유통과학회 학술대회 논문집 Vol.2017 No.-
This study is empirically to examine relationship of Vietnam Online Shopping Mall Characteristic, System Quality and Consumer Reuse. Data was collected by administering a survey to consumer used online shopping mall. The survey questionnaire comprised of a 5-point Likert scale. The demographic analysis was conducted using the frequency analysis method and relationship of variable was conducted using the EFA analysis, reliability analysis, multiple regression analysis. The results of study are “online shopping mail characteristic effect to consumer satisfaction”, “system quality effect to consumer reliability” but “System interactivity don’t effect to consumer Reliability”, and “consumer reliability and satisfaction effect to Consumer reuse Intention”.
An IF Bandpass Filter Based on a Low Distortion Transconductor
Ha Le-Thai,Huy-Hieu Nguyen,Hoai-Nam Nguyen,Hong-Soon Cho,Jeong-Seon Lee,Sang-Gug Lee IEEE 2010 IEEE journal of solid-state circuits Vol.45 No.11
<P>In this paper, a linearity improvement technique is proposed for a low-distortion G<SUB>m</SUB>-C bandpass filter operating in high IF ranges. The proposed transconductor eliminates G<SUB>m</SUB>' value at the output by superposing the opposite non-linear behaviors of two differential structures in parallel. For the bandpass filter, instead of conventional biquad structure, a resonant-coupling structure is adopted for a flat frequency response which is insensitive to process and temperature variations. Fabricated in 65 nm CMOS process, the implemented 80 MHz bandpass filter shows a flat bandpass characteristic with 0.1 dB ripple, third-order harmonic rejection of 27 dB, IIP3 of -2 dBm, and NF of 21.5 dB, while consuming 11 mA from 1.2-V supply. The filter occupies the chip size of 0.5 × 0.5 mm<SUP>2</SUP>.</P>
Tourists' Satisfaction towards Bao Loc City, Vietnam
GIAO, Ha Nam Khanh,HANG, Tran Dieu,SON, Le Thai,KIEM, Dinh,VUONG, Bui Nhat Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.7
Bao Loc City is the new tourism destination in Lam Dong province, Vietnam, where more and more tourists have been drawn to pay a visit. This study aims to test the correlative impact of tourism service quality factors on satisfaction of the tourists who have visited Bao Loc City. The key theory used in this study is SERVQUAL scale. The survey sample consists of 350 tourists who stayed overnight in Bao Loc City in the last quarter of 2019; 315 valid survey questionnaires could be used for the analysis. The research applied Cronbach's Alpha, exploratory factor analysis (EFA), confirmatory factor analysis (CFA), structural equation modeling (SEM), and bootstrap test. The results show that the satisfaction of the tourists who have visited Bao Loc City has been affected statistically by three factors: (1) Responsiveness; (2) Reliability; and (3) Empathy, which were ranked by descending importance. Surprisingly, the research found that Tangibles and Assurance do not have an impact on tourists' satisfaction towards Bao Loc City. The research formulates some suggestions to the city policy-makers and the tourism businesses management in Bao Loc City in order to enhance tourists' satisfaction through improving the tourism service quality at Bao Loc City.
Li, Yi,Duy Le, Thai Minh,Nam Bui, Quang,Yang, Hong Yu,Lee, Doo Sung Elsevier 2019 Carbohydrate polymers Vol.226 No.-
<P><B>Abstract</B></P> <P>In this work, tumor acidity and CD44 dual targeting hyaluronic acid-coated gold nanorods (AuNRs) are investigated for combined chemo- and photothermal cancer therapy. Low molecular weight hyaluronic acid (LMWHA) is conjugated with pH-sensitive groups for pH-induced aggregation and lipoic acid for coating of AuNRs. By changing pH-sensitive groups with different pKa values, pH-sensitivity of modified LMWHA can be tuned. After coating modified LMWHA onto AuNRs, biocompatibility of the AuNRs is significantly improved. These LMWHA-coated AuNRs can gradually aggregate under slightly acidic conditions, making them favorable for accumulation at acidic tumor sites. Surface LMWHA allows the nanocomposites to be selectively uptaken by CD44-expressing cancer cells, and AuNRs endows the nanocomposites with excellent photothermal ability. Loading of doxorubicin, a chemical drug, provides the LMWHA-coated AuNRs synergistic cancer cell-killing (<I>in vitro</I>) and tumor growth inhibiting (<I>in vivo</I>) ability. Taken together, these results demonstrate that this multifunctional nanosystem with pH-induced aggregation and CD44 targeting has potential for combined chemo- and photothermal cancer therapy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Conjugation of pH-sensitive groups induces acidity-triggered aggregation. </LI> <LI> Surface coating of hyaluronic acid allows selective tumor targeting of nanoparticles. </LI> <LI> Co-delivery of chemical drugs and gold nanorods enables combined cancer therapy. </LI> </UL> </P>
Impacts of Loan Support Policy on Farm Income in Vietnam
Thien Ly Dao,Thai-Ha Le,Binh Tran-Nam 중앙대학교 경제연구소 2023 Journal of Economic Development Vol.48 No.2
Assessing the impact of agricultural policies is challenging due to resource limitations and problem identification. This study evaluates the impact of a loan support program on the income of agricultural farms in Vietnam’s crop cultivation and aquaculture sectors. Using the regression discontinuity method and data from Vietnam’s Rural, Agriculture, and Fishery report, encompassing 15,749 farms across 23 provinces in the Central Highlands, Southeast, and Mekong River Delta, we analyze the program’s effects based on farmland holding size. Results indicate a positive impact on annual crops value but a negative impact on income from rice cultivation. Income from perennial crops, such as coffee, showed little increase, while income from pepper cultivation decreased. However, income from aquaculture demonstrated an increase. Overall, the program positively influenced total income with an annual increase of approximately 14.5%. It is evident that the loan support policy is suitable for farm development but may not always yield positive outcomes for specific activities.
Lan Huong Nguyen,Van Son Le,Luu Dung Tran,Nam Van Thai,Ho Thi Ngoc Tram,Bui Quang Minh,Van Huy Nguyen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
This study successfully developed a low-cost adsorbent from compositing between magnetic nanoparticle(CoFe2O4) and dragon fruit peel-derived biopolymer (DFP-BP) and applied it to remove arsenite (As(III)) from contaminated water. The batch experiments were designed to study the influence of operationalparameters on As(III) adsorption by nanocomposite (CoFe2O4@DFP-BP). With mapping analysis,the synthesized CoFe2O4@DFP-BP was characterized using SBET, SEM, FTIR, XRD, and EDS mapping. TheAs(III) adsorption mechanism was discussed based on material property data and isotherm and kineticanalysis. The result suggests that 5% is the best modification ratio on the CoFe2O4@DFP-BP for As(III)adsorption. The highest adsorption capacity of As(III) under the optimal conditions of pH 7, adsorbentdosage of 1.6 g/L, initial As(III) concentration of 2000 lg/L and the best described by the Sips modelwas 1922.7 lg/g. The adsorption kinetic followed pseudo-second-order, proving As(III) adsorption processcontrolled by chemisorption. The primary reaction pathway of As(III) adsorption on theCoFe2O4@DFP-BP5 was inner-sphere complexation through exchange between the nanoadsorbent’s surfaceand As(III) ions via oxygen-containing functional (carboxyl and hydroxyl) groups. The CoFe2O4 magneticnanoparticles coated by biopolymer overcame drawbacks, including low stability and mechanicalstrength of biopolymer and agglomerate trend of magnetic nanoparticles. The adsorption process washighly reversible and accessible in the separation of nanoadsorbent after adsorption by the magnet. Therefore, the nanocomposite formed from solid waste has excellent potential as a material for removingAs, contributing to sustainable development and feasibility in practical application.