Key Determinants of Repurchase Intention toward Organic Cosmetics

Phuong Ngoc Duy NGUYEN,Vinh Tan NGUYEN,Nguyen Ngoc Thao VO 한국유통과학회 2019 The Journal of Asian Finance, Economics and Busine Vol.6 No.3

This paper aims to discover factors and their influences degree to repurchase organic cosmetic in Vietnam. In addition, this research also discloses the main segments that have high demand re-buying intention based on demographic groups of gender, age, income, educational level, job, type of products, and place of production. Twenty-eight scale was designed based on previous studies and adjusted to match the 5-point Likert scale to conduct measurement. By using survey method to test hypotheses and set up conceptual models to collect 295 Vietnamese consumers who have experience in consuming organic cosmetic by explain the results through Smart PLS software. The findings show that there is positive attitude of customers to the intention of acquiring organic cosmetics, green perceived and customer satisfaction. In addition, customer satisfaction, knowledge of products, safety values, and environmental protection consciousness also play important roles to form a positive attitude of customers for products. Moreover, the consciousness of green living of consumers accounts for a high proportion in creating customer satisfaction for organic products. The results show useful information for current premises to determine the factors that influence the decision to repurchase organic cosmetic product, that provide business strategies.

The Impact of Extrinsic Work Factors on Job Satisfaction and Organizational Commitment at Higher Education Institutions in Vietnam

Phuong Ngoc Duy NGUYEN,Linh Le Khanh NGUYEN,Dong Nguyen Thanh LE 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.8

The purpose of this study is to explore the link between job satisfaction and organizational commitment at higher education institutions (HEIs) in emerging countries such as Vietnam and to determine extrinsic work factors that influence job satisfaction. Higher education is critical for socio-economic growth and the overall development of each country. Hence, an understanding of what motivates employees’ actions and attitudes should be obtained before determining the extent of employee satisfaction. The conceptual model was developed by incorporating job satisfaction-related variables, their relationships, and the impact of job satisfaction on organizational commitment. An empirical study was conducted on a study sample of public and private universities, with 316 academics and non-academic employees surveyed. The current study employed the partial least squares structural equation modeling to test the proposed hypotheses. The results reveal a positive and significant relationship between job satisfaction and organizational commitment. The findings confirm that extrinsic work factors (job itself, supervision, working conditions, payment, and reward and recognition) have a positive and significant relationship with job satisfaction. Furthermore, the study indicates that employees at HEIs who have a high level of ability utilization and supervisor support are more likely to be satisfied with their jobs.

Examining Customers' Continuance Intentions towards E-wallet Usage: The Emergence of Mobile Payment Acceptance in Vietnam

PHUONG, Nguyen Ngoc Duy,LUAN, Ly Thien,DONG, Vu Van,KHANH, Nguyen Le Nhat Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.9

The purpose of the research is to identify antecedents of mobile wallet continuance intention in Vietnam. A self-administered questionnaire was distributed to collect data from a total of 276 respondents. Partial least squares structural equation modeling was employed for analyzing the data. Five mobile wallet features - mobile application quality, mobile wallet familiarity, situational normality, payment security, and feedback mechanism - are introduced as fundamental elements, which influence customer' continuance intention to use mobile wallet in Vietnam. The results indicate that mobile quality application and familiarity can significantly influence perceived ease-of-use (PEOU) and perceived usefulness (PU), but situational normality has an impact only on PEOU. PEOU and PU are positively related to satisfaction. On the other hand, payment security and feedback mechanism affect positively customer' trust. As a result, the positive effects that satisfaction and trust have on electronic wallet continuance intention are confirmed. The findings can be used to advise mobile wallet providers to improve their platform design and services to retain users. As a theoretical contribution, this study combines the Technology Acceptance Model, Unified Theory of Acceptance and Use of Technology to investigate the key determinants on continuance intention in the context of electronic wallet in Vietnam.

Ethical Leadership, Organizational Justice and Supporting Environment on Employee Engagement: Empirical Evidences for Public Policy Implications

Nguyen Ngoc Duy Phuong,Mai Ngoc Khuong,Thai Hoang Quoc,Le Nguyen Thanh Dong 한국유통과학회 2017 KODISA ICBE (International Conference on Business Vol.2017 No.-

The purpose of this study was to examine the direct and indirect effect of ethical leadership, organizational justice, organizational support on employee satisfaction and employee engagement. Very little research has been conducted to study those relationships in the socialization context. This paper attempts to fill the gap by analyzing data from a survey of 677 employees from industrial parks. This study used a survey instrument that consists of 2 sections. To ensure content validity, the survey items were derived from those used in previous studies. Each item was measured using a 5-point Likert scale. Ethical leadership scale with ten items were adopted from Toor and Ofori (2009). Partial least square structural equation modeling (PLS-SEM) is employed for testing the structural models and exploratory study is also identified to evaluate the relationship among variables. The findings provided evidence that employee satisfaction is the most important to predict employee engagement. The results also reveal the important effect of ethical leadership, organizational justice and supporting environment on job satisfaction. Implications for public policy practice and further research are also suggested based on the results of structural analysis.

The Effect of Two-Dimensional Factor on Municipal Civil Servants’ Job Satisfaction and Public Policy Implications

Nguyen Ngoc Duy Phuong,Mai Ngoc Khuong,Le Huu Phuc,Le Nguyen Thanh Dong 한국유통과학회 2018 The Journal of Asian Finance, Economics and Busine Vol.5 No.3

The purpose of this study was to examine the effect of two-dimensional factor of motivators and hygiene on civil servants’ job satisfaction using the partial least square structural equation modeling (PLS-SEM) as a technique employed to analyze the measurement and structural models. Exploratory study was deployed to evaluate the relationship among variables. By using multistage stratified sampling, statistical data was collected from a survey of 441 public municipal civil servants who have employed in various levels (municipal government, districts and communes) in Vietnam. The findings provided evidence that hygiene factors (relationship with leader, salary, relationship with coworker and working environment) directly impact on civil servants’ job satisfaction. Meanwhile, only career development factor from motivators significantly influenced on public employee’s job satisfaction. Based on the empirical results, the hygiene factors of job satisfaction are more dominated that the motivators one. This finding suggests that municipal governments should focus policies on improving the hygiene factors which lead to higher job satisfaction on civil servants. Gaining a thorough understanding of the determinants of job satisfaction toward municipal public servants will enable policy makers to grasp the factors that results in retaining employees. Finally, the policy makers can use this knowledge to promote civil servants’ job satisfaction.

The Effect of Country-of-Origin on Customer Purchase Intention: A Study of Functional Products in Vietnam

Nguyen Ngoc Duy Phuong,Nguyen Tien Dat 한국유통과학회 2017 The Journal of Asian Finance, Economics and Busine Vol.4 No.3

This paper examines key determinants and the effect of country-of-origin on customer’s purchase intention of functional food and dietary supplement product in Vietnam. Exploratory study was identified to evaluate personal and social factors on customer’s buying behavior. Twenty-eight reflective constructs were adapted from literature and designed by using a seven-point Likert scale to facilitate measurement. By using non-probability convenience sampling, data was collected from a survey of 242 Vietnamese who have experienced in buying functional and supplement food. This paper employed partial least square structural equation modeling (PLS-SEM) as a technique employed to analyze the measurement and structural models. The findings provide evidence that social prestige customer perceives and their positive attitude toward functional food which are main factors influencing on consumers’ purchase intention. Customer’s perceived prestige plays an important role in decision-making process to purchase. The higher social prestige taken up in consumers’ mind, the higher consumers’ purchase intention is. Moreover, the more positive attitude customer holds toward functional food, the higher consumers’ purchase intention. The research results provide useful information in current understanding of what antecedents determine factors influencing customer’s intention to purchase functional food and lead to managerial implications for business strategies.

The Effect of Two-Dimensional Factor on Municipal Civil Servants’ Job Satisfaction and Public Policy Implications

Nguyen Ngoc Duy Phuong,Mai Ngoc Khuong,Le Huu Phuc,Le Nguyen Thanh Dong 한국유통과학회 2017 KODISA ICBE (International Conference on Business Vol.2017 No.-

The purpose of this study was to examine the effect of two-dimensional factor of motivators and hygiene on civil servants’ job satisfaction by the partial least square structural equation modeling (PLS-SEM) as a technique employed to analyze the measurement and structural models. This study used a survey instrument that consists of 2 sections. To ensure content validity, the survey items were derived from those used in previous studies. Each item was measured using a 5-point Likert scale. Exploratory study was identified to evaluate the relationship among variables. By using multistage stratified sampling, statistical data was collected from a survey of 441 public municipal civil servants who have employed in various levels (municipal government, districts and communes) in Vietnam. The findings provided evidence that hygiene factors (relationship with leader, salary, relationship with coworker and working environment) directly impact on civil servants’ job satisfaction. Meanwhile, only career development factor from motivators significantly influenced on public employee’s job satisfaction. The theoretical and practical significances of the study were discussed and public policy implications were suggested to the provincial government.

Examination of the Astrophysical-Rate Variations of the Key Reactions in the rp-Process due to Mass Uncertainties

Duy Nguyen Ngoc,Ho Phuong-Thao,Uyen Nguyen Kim 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.10

We report on the variations of the astrophysical rates due to mass uncertainties of the exotic nuclei in rp-process reactions. With the current mass precision obtained in the AME2016 database, only the 71Br(p,γ)72Kr and the 65As(p,γ)66Se reactions have rate uncertainties of about 10% - 20% at T9 = 0.5 while the 61Ga(p,γ)62Ge, 61, 64, 65Ge(p,γ)62, 65, 66As, 68, 69Se(p,γ)^{69, 70}Br, 69,70Br(p,γ)70,71Kr, and 75Rb(p,γ)76Sr reactions have large uncertainties of more than 50%. If an uncertainty of 10% at T9 = 1.0 is to be achieved, the mass precisions for the isotopes must be less than 10 keV. Evaluations of the photodisintegrations corresponding to proton captures and β+ decays of the waiting points, 64Ge and 68Se, indicate that the orientation of the nucleosynthesis at these waiting points is still unknown due to the large astrophysical rate variations because of the mass uncertainties of the 65As and the 69Br isotopes. The astrophysical rate variations corresponding to the mass precision levels at specific temperatures are presented in this work.

Line Impedance Estimation Based Adaptive Droop Control Method for Parallel Inverters

Phuong Minh Le,Xuan Hoa Thi Pham,Huy Minh Nguyen,Duc Duy Vo Hoang,Tuyen Dinh Nguyen,Dieu Ngoc Vo 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1

This paper presents a new load sharing control for use between paralleled three-phase inverters in an islanded microgrid based on the online line impedance estimation by the use of a Kalman filter. In this study, the mismatch of power sharing when the line impedance changes due to temperature, frequency, significant differences in line parameters and the requirements of the Plug-and-Play mode for inverters connected to a microgrid has been solved. In addition, this paper also presents a new droop control method working with the line impedance that is different from the traditional droop algorithm when the line impedance is assumed to be pure resistance or pure inductance. In this paper, the line impedance estimation for parallel inverters uses the minimum square method combined with a Kalman filter. In addition, the secondary control loops are designed to restore the voltage amplitude and frequency of a microgrid by using a combined nominal value SOGI-PLL with a generalized integral block and phase lock loop to monitor the exact voltage magnitude and frequency phase at the PCC. A control model has been simulated in Matlab/Simulink with three voltage source inverters connected in parallel for different ratios of power sharing. The simulation results demonstrate the accuracy of the proposed control method.

An Approximation of the Synthesis Cross Section for the Unknown 126th Element via 58Ni + 251Cf and 64Zn + 248Cm Combinations

Duy Nguyen Ngoc,Ho Phuong-Thao,Pham Vinh N. T.,Hoan Nguyen Thi Thu 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.1

In this paper, we estimate the production cross section of the unknown super-heavy nuclei 309, 312126 via 58Ni + 251Cf and 64Zn + 248Cm combinations by using approximation methods. For each reaction, the competition between compound nucleus (CN) formation and quasi-fission process is also analyzed. We found that the synthesis cross section for the 309126 isotope is about 3 fb, which is about 5 orders of magnitude higher than that for the 312126 nucleus. The results also suggest that a valley exists around the isotope with A = 313 in the production yields for the 126th element. Moreover, the synthesis of the 310-317126 isotopes is still a challenge for experimental techniques due to the small cross sections, which are less than 1 fb.