Research o n the Role o f the Attitud es o f Vietnamese C onsumers Towards their Intentions to Use Mobile Money

Thuy Hang Vu Thi(Thuy Hang Vu Thi ) People & Global Business Association 2024 Global Business and Finance Review Vol.29 No.2

SCN1A Gene Mutation and Adaptive Functioning in 18 Vietnamese Children with Dravet Syndrome

Thi Thu Hang Do,Diem My Vu,Thi Thuy Kieu Huynh,Thi Khanh Van Le,손은화,Thieu Mai Thao Le,Huu Hao Ha,Chi Bao Bui 대한신경과학회 2017 Journal of Clinical Neurology Vol.13 No.1

Background and Purpose Dravet syndrome is a rare and severe type of epilepsy in infants. The heterogeneity in the overall intellectual disability that these patients suffer from has been attributed to differences in genetic background and epilepsy severity. Methods Eighteen Vietnamese children diagnosed with Dravet syndrome were included in this study. SCN1A variants were screened by direct sequencing and multiplex ligation-dependent probe amplification. Adaptive functioning was assessed in all patients using the Vietnamese version of the Vineland Adaptive Behavior Scales, and the results were analyzed relative to the SCN1A variants and epilepsy severity. Results We identified 13 pathogenic or likely pathogenic variants, including 6 that have not been reported previously. We found no correlations between the presence or type of SCN1A variants and the level of adaptive functioning impairment or severity of epilepsy. Only two of nine patients aged at least 5 years had an adaptive functioning score higher than 50. Both of these patients had a low frequency of convulsive seizures and no history of status epilepticus or prolonged seizures. The remaining seven had very low adaptive functioning scores (39 or less) despite the variability in the severity of their epilepsy confirming the involvement of factors other than the severity of epilepsy in determining the developmental outcome. Conclusions Our study expands the spectrum of known SCN1A variants and confirms the current understanding of the role of the genetic background and epilepsy severity in determining the developmental outcome of Dravet syndrome patients.

Factors Affecting the Application of Strategy Management Accounting in Vietnamese Logistics Enterprises

Thi Kim Anh VU,Bich Ha DAM,Thi Thuy Van HA 한국유통과학회 2022 유통과학연구 Vol.20 No.1

Purpose This research aims to investigate factors affecting the application of strategic management accounting in Vietnamese Logistics Enterprises. Design/Methodology/ Approach: Quantitative research was conducted and data was collected by sending questionnaires to 188 accountants and directors from Vietnamese Logistics Enterprises (including, transportation, warehousing and forwarding). 5 factors (namely: size and organizational structure, technological advancement, and strategic management accounting implementing costs) were selected to measure the application of strategic management accounting (SMA) in Vietnamese Logistics Enterprises (LEs) through correlation and regression analysis. Results: The empirical findings show that there exists a significant association between these factors and the SMA application. LEs have strongly supported the application of SMA as a tool to provide information for making their strategic decisions. The factors including size and organizational structure, technological advancement, SMA implementing c osts, and strategy positively impact the SMA application in both financial and non-financial aspects. This finding helps the adm inistrators realize the importance of SMA. Conclusions: This study provided an overview of SMA application and its benefits to enterprises. It helps managers have a better understanding of SMA and future directions for application. Moreover, the research results will be useful for managers to identify factors influencing their SMA practices and improve the current management process applied in organizations.

Direct synthesis of H2O2 over Pd/C catalysts prepared by the incipient wetness impregnation method: Effect of heat treatment on catalytic activity

Vu Thi Thuy Hang,정영민 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.1

Although various Pd/C catalysts have been applied in the direct synthesis of H2O2, unsatisfactory H2O2 yields have been achieved. We systematically investigated the effect of heat treatment on the physicochemical properties of Pd/C catalyst, and thereby on the catalytic performance in the direct synthesis of H2O2. Pd/C catalysts prepared by the incipient wetness method were subjected to different heat treatments and applied in H2O2 synthesis. The calcination temperature was found to have a key role in determining the Pd nanoparticle (NP) size; calcination at 523 K yielded highly oxidized and small Pd NPs corresponding to the sub-nano domain (1.4-2.5 nm). This Pd/C catalyst is superior not only in promoting H2O2 formation, but also in suppressing the subsequent unfavorable H2O2 decomposition and hydrogenation, which explains its excellent H2O2 productivity (as high as 4,443mmol H2O2/g Pd·h) and selectivity (94.5%). On the other hand, the reaction performance of the Pd/C catalysts calcined at a higher temperature (673 K) or reduced under hydrogen was sharply reduced owing to the formation of larger Pd NPs or the enhancement of the metallic nature of Pd, respectively. The amount of residual Cl ion on Pd/C catalyst after heat treatment also had an impact on the catalytic activity as it affected the pH of reaction solution. These results clearly demonstrate that an efficient Pd/C catalyst can be realized by fine tuning the conditions of heat treatment during catalyst preparation.

Determinants Influencing Consumers Purchasing Intention for Sustainable Fashion: Evidence from Ho Chi Minh City

Thuy Thi Hai HO,Trinh Ngoc Phuong VU,Hieu Minh VU 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11

This paper investigates factors impacting on sustainable fashion buying intention of consumers by reviewing studies about the topic and conducting a survey with consumers in Ho Chi Minh City. In detail, firstly, an interview with 15 respondents was conducted to check the understanding of concepts and questions and, secondly, the study used the convenient sampling method, with 172 samples collected and analyzed, of which young respondents accounted for the majority of the sample. The respondents tend to go shopping many times in a year, with the number of people buying fashion products from every week to every two months accounting for 65.2% totally. The findings suggest that the firms should prioritize strategies that can improve customer attitude toward sustainable fashion, making them feel good, pleasant, satisfied and favorable when engaging in sustainable fashion consumption. This study concludes that consumers need more information to enable them to make better ethical decisions. This study proposes that the major channels that consumers use to seek sustainable product information include public education, peer influence, and corporate marketing information about the products. This study concludes that public education and corporate marketing information on green consumption education is effective for improving consumer sustainable buying intention.

Effect of Zn/Al Cation Ratio on Corrosion Inhibition Capabilities of Hydrotalcites Containing Benzoate Against Carbon Steel

Thuy Duong Nguyen,To Thi Xuan Hang,Thu Thuy Pham,Anh Son Nguyen,Thu Thuy Thai,Gia Vu Pham,Ngoc Bach Ta 한국부식방식학회 2022 Corrosion Science and Technology Vol.21 No.6

Corrosion inhibitors based on Zn-Al hydrotalcites containing benzoate (ZnAlHB) with different molar ratios of Zn/Al were prepared with a co-precipitation process. Compositions and structures of the resulting hydrotalcites were studied with suitable spectroscopic methods such as inductively coupled plasma mass spectrometry (ICP-MS), ultraviolet-visible spectrophotometry (UV-Vis), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and surface zeta potential measurements, respectively. Results of physico-chemical studies showed that crystallite sizes, compositions of products, and surface electrical properties were significantly changed when the molar ratio of Zn/Al was increased. The release of benzoate from hydrotalcites also differed slightly among samples. Anticorrosion abilities of hydrotalcites intercalated with benzoate at a concentration of 3 g/L on carbon steel were analyzed using electrochemical impedance spectroscopy (EIS), polarization curve, energy-dispersive X-ray spectroscopy (EDX), and SEM. Corrosion inhibition abilities of benzoate modified hydrotalcites in 0.1 M NaCl showed an upward trend with increasing Zn/Al ratio. The reason for the dependence of corrosion resistance on the Zn/Al ratio was discussed, including changes in the microstructure of hydrotalcites such as crystal size, density, uniformity, and formation of ZnO.

Impacts of Ownership Structure on Systemic Risk of Listed Companies in Vietnam

VU, Van Thi Thuy,PHAN, Nghia Trong,DANG, Hung Ngoc Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.2

The research objective of the paper is to clarify the factors influencing system risks of listed companies in Vietnam, with a focus on clarifying the relationship and quantifying the impacts of ownership structure on systemic risk of listed companies. The data used in this study included financial statements and stock price data of listed companies on the Ho Chi Minh City Stock Exchange and Hanoi Stock Exchange of Vietnam stock market in the period from 2010 to 2017. The paper used the method of estimation in establising the regression models to choose among three models: Random Effect Model, Fixed Effect Model or Pooled OLS for regression using Stata statistical software. The research results showed that state ownership and ownership by foreign investors were positively related to systemic risk, while ownership by domestic investors had a reverse relationship with systemic risk of listed companies in Vietnam. In addition, as a control variable, both company size and profitability had an effect on the systemic risk of listed companies in the research sample. Based on the research results, the authors interpreted some of the implications in order to minimize systemic risks in the operation of listed companies in Vietnam.

Nonlinear Speed Control of PM Synchronous Motor with Extended Kalman Filter Observer

Vu, Nga Thi-Thuy,Jung, Jin-Woo The Korean Institute of IIIuminating and Electrica 2011 조명·전기설비학회논문지 Vol.25 No.3

This paper proposes a nonlinear speed controller for a permanent magnet synchronous motor (PMSM). In this paper, the load torque is estimated by an extended Kalman filter (EKF) observer because the proposed controller needs its knowledge. To confirm the effectiveness of the proposed control scheme, simulations and experiments are performed under motor parameter variations with a prototype PMSM drive system.

Inhibitory Effect of Benzoate-intercalated Hydrotalcite with Ce³⁺-loaded clay on Carbon Steel

( Thuy Duong Nguyen ),( Thu Thuy Pham ),( Anh Son Nguyen ),( Ke Oanh Vu ),( Gia Vu Pham ),( To Thi Xuan Hang ) 한국부식방식학회 2023 Corrosion Science and Technology Vol.22 No.1

This work studied the inhibitory effect of the combination of benzoate-intercalated hydrotalcite (HT-BZ) and Ce³⁺-loaded clay (Clay-Ce) on carbon steel (CS). HT-BZ was prepared by the co-precipitation method and Clay-Ce was fabricated by a cation exchange reaction. HT-BZ and Clay-Ce were assessed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) coupled with zeta potential measurement. Electrochemical measurements coupled with scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDX) were used for studying the inhibitory action of the mixture of HT-BZ and Clay-Ce on steel electrodes immersed in 0.1 M NaCl. For comparison, the inhibitory effect of HT-BZ or Clay-Ce alone was also evaluated. The results showed that HT-BZ combined with Clay-Ce provided synergistic inhibition of the CS substrate. The mixture of 0.5 g/L HT-BZ + 0.5 g/L Clay-Ce provided 93.5% inhibition efficiency. The protective mechanism of the HT-BZ + Clay-Ce mixture consisted of the reaction of released BZ and Ce³⁺ and the deposition of HT-BZ and Clay-Ce structures on the CS substrate.

Profitability and the Distance to Default: Evidence from Vietnam Securities Market

Van Thuy Thi VU,Nhung Hong DO,Hung Ngoc DANG,Tram Ngoc NGUYEN 한국유통과학회 2019 The Journal of Asian Finance, Economics and Busine Vol.6 No.4

The paper examines the influence of profitability on distance to default (DD) in Vietnam securities market. The investigated sampl e consists of 211 companies listed on HOSE during 18 years from 2010 to 2017. We apply KMV model to calculate distance to d efault and use both macroeconomics factors and firm specific factors as independent variables. Using General Least Squared (GL S) method, we find evidence to confirm the positive relationship between profitability and distance to default. This result showed t hat, although profitability did not directly reflect the cash flow generated, a good profitable enterprise would be an important facto r to help facilitate and generate cash flow and at the same time debt was guaranteed when it was due. Besides, the test results rev ealed that the financial structure and sales on assets have the inverse effect on the distance to default at the significance level o f 5%. The results also revealed that a group of macro factors had an influence on the distance to default of businesses, including spre ad, GDP and trade balance (via exchange rates). Gross domestic income had certain impacts on the distance to default of businesse s. This was also a basic indicator measuring the national economic cycle.