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      • SCOPUS

        Changes in Income Distribution During the COVID-19 Pandemic: Empirical Evidence from Vietnam

        Quyet Thang DAO,Thi Yen LE,Van Hung PHAM 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.1

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        This study examines changes in income for Vietnam’s service labors during COVID-19. A person’s income depends on several factors, such as educational level, working area, the number of activities creating jobs, the cost of living, investment, etc. This research was based on a survey of 479 workers in Vietnam’s service sector, who were evenly distributed across sectors (tourism and aviation) and workplaces (State and private). Based on the collected data, the REM regression model was used to analyze the factors influencing employee income when COVID-19 took place. The research returns show that the COVID-19 pandemic has had a considerable influence on labor incomes, and there are income disparities that exist between workers by work area and by gender. This study indicates that workers’ wages in Vietnam decreased by an average of 12.22 million VND per month after the outbreak of COVID-19. In addition, the results also show that the income of workers after COVID-19 differs depending on their position (the average salary of laborers working in the public sector is about 3.946 million VND higher than the average salary of laborers in the private sector); furthermore, the incomes of workers also vary by gender.

      • SCOPUS

        Factors Affecting Industry and University Collaboration in Education in the Hospitality Industry in Vietnam: A Business Perspective

        NGUYEN, Thang Quyet,NGUYEN, Hoa Thi Thu Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.2

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        This paper studies the factors affecting university and industry collaboration in education in the hospitality industry in Ho Chi Minh City (Vietnam) from a company perspective. The authors use qualitative method and quantitative research to study the matters, specifically using scales and data collected for Cronbach alpha reliability testing, analysizing the discovery factor of EFA, CFA and verifying the regression models through AMOS software with SEM linear modeling. The study proposes four factors: (1) organization factors, (2) contextual factors, (3) process factors, and (4) cooperation perspective impacting on the benefits factors and university and industry collaboration in education. In addition, it is also found that benefits factors has a direct and positive impact on the collaboration in education. The results suggest that the process factor had the strongest positive, followed by the contextual factor. The findings revealed that the benefit factors were significantly related to collaboration in education, which affects university and industry hospitality alliances. This finding confirm that the cooperation perspective (QD) and contextual factors (HC) are critical in collaboration between university and industry. A new point of interest is also identified that the benefits of training links are quite dependent on the linking perspective from tourism businesses.

      • SCOPUS

        Changes in Income Distribution During the COVID-19 Pandemic: Empirical Evidence from Vietnam

        DAO, Quyet Thang,LE, Thi Yen,PHAM, Van Hung Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.1

        This study examines changes in income for Vietnam's service labors during COVID-19. A person's income depends on several factors, such as educational level, working area, the number of activities creating jobs, the cost of living, investment, etc. This research was based on a survey of 479 workers in Vietnam's service sector, who were evenly distributed across sectors (tourism and aviation) and workplaces (State and private). Based on the collected data, the REM regression model was used to analyze the factors influencing employee income when COVID-19 took place. The research returns show that the COVID-19 pandemic has had a considerable influence on labor incomes, and there are income disparities that exist between workers by work area and by gender. This study indicates that workers' wages in Vietnam decreased by an average of 12.22 million VND per month after the outbreak of COVID-19. In addition, the results also show that the income of workers after COVID-19 differs depending on their position (the average salary of laborers working in the public sector is about 3.946 million VND higher than the average salary of laborers in the private sector); furthermore, the incomes of workers also vary by gender.

      • KCI등재

        Biochemical and Molecular Characterization of Glycerol Dehydrogenase from Klebsiella pneumoniae

        고경수,Quyet Thang Nguyen,김도현,양진국 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.2

        Glycerol dehydrogenase (GlyDH) catalyzes the oxidation of glycerol to dihydroxyacetone (DHA), which is the first step in the glycerol metabolism pathway. GlyDH has attracted great interest for its potential industrial applications, since DHA is a precursor for the synthesis of many commercially valuable chemicals and various drugs. In this study, GlyDH from Klebsiella pneumoniae (KpGlyDH) was overexpressed in E. coli and purified to homogeneity for biochemical and molecular characterization. KpGlyDH exhibits an exclusive preference for NAD+ over NADP+. The enzymatic activity of KpGlyDH is maximal at pH 8.6 and pH 10.0. Of the three common polyol substrates, KpGlyDH showed the highest kcat/Km value for glycerol, which is three times higher than for racemic 2,3-butanediol and 32 times higher than for ethylene glycol. The kcat value for glycerol oxidation is notably high at 87.1 ± 11.3 sec-1. KpGlyDH was shown to exist in an equilibrium between two different oligomeric states, octamer and hexadecamer, by size-exclusion chromatography analysis. KpGlyDH is structurally thermostable, with a Tm of 83.4oC, in thermal denaturation experiment using circular dichroism spectroscopy. The biochemical and biophysical characteristics of KpGlyDH revealed in this study should provide the basis for future research on its glycerol metabolism and possible use in industrial applications.

      • Surface extension of MeS<sub>2</sub> (Me=Mo or W) nanosheets by embedding MeS<sub>x</sub> for hydrogen evolution reaction

        Nguyen, Thang Phan,Le, Quyet Van,Choi, Seokhoon,Lee, Tae Hyung,Hong, Seung-Pyo,Choi, Kyoung Soon,Jang, Ho Won,Lee, Min Hyung,Park, Tae Jung,Kim, Soo Young Elsevier 2018 ELECTROCHIMICA ACTA Vol.292 No.-

        <P><B>Abstract</B></P> <P>Two-dimensional transition metal dichalcogenides (2D-TMDs), such as MoS<SUB>2</SUB> and WS<SUB>2</SUB> nanosheets (MeS<SUB>2</SUB>-NS), are reported as efficient catalysts for hydrogen evolution reaction (HER), which can potentially replace the expensive platinum catalyst. In this report, 1T phase MeS<SUB>2</SUB> (1T-MeS<SUB>2</SUB>) NS are synthesized by lithium-intercalation exfoliation method, subsequently being modified by amorphous MoS<SUB>x</SUB> and WS<SUB>x</SUB> (MeS<SUB>x</SUB>@MeS<SUB>2</SUB>-NS) through a solvothermal method. Interestingly, MeS<SUB>x</SUB>@MeS<SUB>2</SUB>-NS significantly improves the HER performance compared with bare MeS<SUB>2</SUB>-NS as catalysts. Among these, MoS<SUB>x</SUB>@MoS<SUB>2</SUB> is observed to be the best combination for HER, with an onset potential and Tafel slope of 114 mV and 45.1 mV decade<SUP>−1</SUP>, respectively. The enhancement in the HER device using MeS<SUB>x</SUB>@MeS<SUB>2</SUB>-NS as the catalyst originates from vertically grown MeS<SUB>x</SUB>, which provides additional active sulfur sites for the reaction, while inhibiting the restacking of MeS<SUB>2</SUB>-NS. Furthermore, MoS<SUB>x</SUB>@MoS<SUB>2</SUB>-NS shows stable catalytic properties for HER after the 1000 cyclic test, without any observable changes. Thus, this study presents a facile method for the synthesis of 2D-TMD catalyst for HER towards large-scale and long-term stability for practical application.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Self-template growth of a 2D materials for hierarchical structure. </LI> <LI> Facile and scalable hydrothermal method. </LI> <LI> Improving of current density and the Tafel slope in optimized samples. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

      • SCISCIESCOPUS

        The use of UV/ozone-treated MoS<sub>2</sub> nanosheets for extended air stability in organic photovoltaic cells

        Le, Quyet Van,Nguyen, Thang Phan,Jang, Ho Won,Kim, Soo Young The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.26

        <P>MoS<SUB>2</SUB> nanosheets obtained through a simple sonication exfoliation method are employed as a hole-extraction layer (HEL) to improve the efficiency and air stability of organic photovoltaic cells (OPVs). The reduction in the wavenumber difference, appearance of a UV-vis peak, and atomic force microscopy images indicate that MoS<SUB>2</SUB> nanosheets are formed through the sonication method. The OPVs with MoS<SUB>2</SUB> layers show a degraded performance with a power conversion efficiency (PCE) of 1.08%, which is lower than that of OPVs without HEL (1.84%). After performing the UV/ozone (UVO) treatment of the MoS<SUB>2</SUB> surface for 15 min, the PCE value increases to 2.44%. Synchrotron radiation photoelectron spectroscopy data show that the work function of MoS<SUB>2</SUB> increases from 4.6 to 4.9 eV upon UVO treatment, suggesting that the increase in the PCE value is caused by the bandgap alignment. Upon inserting poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) between MoS<SUB>2</SUB> and the active layer, the PCE value of the OPV increases to 2.81%, which is comparable with that of the device employing only PEDOT:PSS. Furthermore, the stability of the OPVs is improved significantly when MoS<SUB>2</SUB>/PEDOT:PSS layers are used as the HEL. Therefore, it is considered that the use of UVO-treated MoS<SUB>2</SUB> may improve the stability of OPV cells without degrading the device performance.</P> <P>Graphic Abstract</P><P>A longer lifetime was achieved for devices using MoS<SUB>2</SUB>/PEDOT:PSS layers than for those employing only the PEDOT:PSS layer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp01598c'> </P>

      • Dual use of tantalum disulfides as hole and electron extraction layers in organic photovoltaic cells

        Le, Quyet Van,Nguyen, Thang Phan,Choi, Kyoung Soon,Cho, Yoon-Ho,Hong, Young Joon,Kim, Soo Young The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.46

        <P>UV/ozone treated (UVO-treated) TaS<SUB>2</SUB> and non-treated TaS<SUB>2</SUB> nanosheets are introduced into organic photovoltaic cells (OPVs) as hole extraction layers (HEL) and electron extraction layers (EEL). TaS<SUB>2</SUB> nanosheets are obtained <I>via</I> ultrasonic vibration and size-controlled by centrifugation. Atomic force microscopy (AFM) images reveal that the thickness and lateral size of TaS<SUB>2</SUB> nanosheets are approximately 1 and 70 nm, indicating that uniform and ultrathin TaS<SUB>2</SUB> nanosheets are obtained. The work function of TaS<SUB>2</SUB> increases from 4.4 eV to 4.9–5.1 eV after applying UVO treatment by forming Ta<SUB>2</SUB>O<SUB>5</SUB>. In addition, the power conversion efficiencies of normal OPV with UVO-treated TaS<SUB>2</SUB> and inverted OPV with TaS<SUB>2</SUB> are 3.06 and 2.73%, which are higher than those of OPV without TaS<SUB>2</SUB> (1.56% for normal OPV and 0.22% for inverted OPV). These results indicate that TaS<SUB>2</SUB> is a promising material for HEL and EEL layers in OPVs.</P> <P>Graphic Abstract</P><P>Organic photovoltaic cells with a UVO-treated TaS<SUB>2</SUB> hole extraction layer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp04412f'> </P>

      • Developing Education Quality for Human Resource in the Tourism Industry - A Study in Ho Chi Min City, Vietnam

        Nguyen,Thang Quyet,Ngo,Thanh Phuong Quynh 한국유통과학회 2019 KODISA ICBE (International Conference on Business Vol.2019 No.-

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Human resource is a key element for developing Tourism in Vietnam. As the most important destination of Vietnam Tourism, Ho Chi Minh city (also known as HCMC) welcomes 60 % total international tourists in Vietnam every year, but the qualification of training for HCMC tourism human resource is rated as low- quality as well as quantity, under the requirements of development and global integration. By synthesizing, document study combined with the survey method; this study has in-depth exploratory, analysis on the reality to conducted reasons of difficulties in human resource training in the Tourism industry, facing by universities, college, vocational centers majored in Tourism (also known as tourism institutions) in Ho Chi Minh City. The result has indicated the enterprises’ evaluation and difficulties in improving the qualification of tourism institutions. Therefore, the report proposed some solutions to improve training human resource efficiency in this field.

      • The role of metal dopants in WS<sub>2</sub> nanoflowers in enhancing the hydrogen evolution reaction

        Hasani, Amirhossein,Nguyen, Thang Phan,Tekalgne, Mahider,Van Le, Quyet,Choi, Kyoung Soon,Lee, Tae Hyung,Jung Park, Tae,Jang, Ho Won,Kim, Soo Young Elsevier 2018 Applied Catalysis A Vol.567 No.-

        <P><B>Abstract</B></P> <P>We demonstrate a facile and efficient method for the synthesis of a metal-doped WS<SUB>2</SUB> nanoflower (NF) catalyst. We also report its application for the electrocatalytic hydrogen evolution reaction (HER). The flower-like WS<SUB>2</SUB> particles were produced by a hydrothermal reaction, and, subsequently, the WS<SUB>2</SUB> was doped with metal chlorides such as AuCl<SUB>3</SUB>, AgCl, PtCl<SUB>2</SUB>, and PdCl<SUB>2</SUB>, followed by reduction with sodium borohydride to form metal-doped WS<SUB>2</SUB> NFs. The Pd-doped WS<SUB>2</SUB> NF catalyst showed a high HER performance, having a Tafel slope of 54 mV/dec and an overpotential of -175 mV at −10 mA cm<SUP>−2</SUP>. The improvement is attributed to the energy band alignment near the H<SUP>+</SUP>/H<SUB>2</SUB> reduction potential and the large surface area of the WS<SUB>2</SUB> NFs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Producing high quality and efficient WS<SUB>2</SUB> nanoflowers by a facile hydrothermal process. </LI> <LI> Metal doping of WS<SUB>2</SUB> nanoflowers <I>via</I> reduction process. </LI> <LI> A uniform distribution of metal atoms into WS<SUB>2</SUB> nanoflowers during doping process. </LI> <LI> Application of optimized Pd-doped WS<SUB>2</SUB> nanoflowers as a catalyst in hydrogen evolution reaction. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

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