Public Debt Management and Its Impact on Economic Development: The Case of Vietnam

Phuong Lan Vo THI(Phuong Lan Vo THI ) 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.9

Public investment is the process of investing capital in projects that serve national interests and thereby create a driving force for economic development in each country. Especially in developing countries, investment capital is limited, so improving the efficiency of public investment becomes a decisive factor for economic development and enhancing the country’s status and ultimately making the country a should be rich. Vietnam has a low starting point, has gone through the doi moi process, and has gradually become a middle-income country, and public investment is attracting attention to improve the quality of the country’s infrastructure. The objective of this study is to evaluate the factors affecting the effectiveness of public debt management in Vietnam, through a survey of 150 experts with knowledge of public investment and public debt management, using the results of the estimation through the Using SPSS software, the research results show that the monitoring system and human resource quality have an impact on the effectiveness of public debt management. The study could not, however, discover any proof of the influence of institutional quality, geographic location, or accountability on the effectiveness of public debt management. The research also addresses several policy recommendations for Vietnam that would help the country manage its public debt better in the future.

EXISTENCE, BLOW-UP AND EXPONENTIAL DECAY FOR A NONLINEAR KIRCHHOFF-CARRIER-LOVE EQUATION WITH DIRICHLET CONDITIONS

Vo Thi Tuyet Mai,Nguyen Anh Triet,Le Thi Phuong Ngoc,Nguyen Thanh Long 경남대학교 기초과학연구소 2020 Nonlinear Functional Analysis and Applications Vol.25 No.4

In this paper, we consider the initial boundary value problem for a nonlin-ear Kirchho-Carrier-Love equation. At rst, by combining the linearization method, the Faedo-Galerkin method and the weak compactness method, we prove the local existence anduniqueness of a weak solution. Next, by constructing Lyapunov functional, we establish a blow-up result for solutions with a negative initial energy and give a sucient condition to obtain the exponential decay of weak solutions.

Learning Routes between Significant Locations Based on Personal GPS Data

보티홍푸옹(Phuong Thi Hong Vo),황규백(Kyu-Baek Hwang) 한국정보과학회 2012 정보과학회 컴퓨팅의 실제 논문지 Vol.18 No.2

Mobile devices equipped with various sensors can be exploited for providing context-aware services. One popular form of the context is location. In this paper, we present methods for learning routes between a predefined set of significant locations, i.e., home, workplaces, frequently-used bus stops and subway stations, based on personal GPS data. Learned personal routes among such significant locations of a user could be utilized for predicting the user's destination when he or she is traveling. Our approach was applied to real GPS datasets from six subjects, consisting of more than 16 million coordinates. The accuracy of our methods for significant location learning was about 80% within a boundary of 30 meters. Our method for destination prediction achieved more than 74% of accuracies after a user completing 60% of the trip. 각종 센서들이 장착된 모바일 기기는 맥락 인식기반의 서비스(context-aware service)에 활용될 수 있으며, 널리 사용되는 맥락 중 하나로 장소를 들 수 있다. 본 논문은 개인이 수집하는 GPS 데이터에 기반하여 주요 장소 및 경로를 학습하는 방법을 제안한다. 고려되는 주요 장소는 집, 직장, 자주 이용하는 버스 정류장 및 지하철 역이며, 이러한 장소들 사이의 경로를 학습한다. 이렇게 학습된 장소 및 경로 정보는 사용자가 이동 중에 있을 때, 목적지를 예측하는 데 활용될 수 있다. 제안된 방법은 6명의 사용자들로부터 수집된 1600만개 이상의 GPS 좌표 데이터에 적용되었으며, 주요 장소 학습에 대한 정확도는 30m의 오차 범위 안에서 80% 정도였다. 또한, 이동 중 목적지 예측에 대한 성능은 경로의 60%를 진행하였을 때, 74% 이상이었다.

The Impact of Country of Origin on Consumption Intention: A Case Study of COVID-19 Vaccines in Vietnam

Minh Sang VO,Ngoc Phu TRAN,Thi Kieu Thu NGUYEN,Thi Cam Tien HUYNH,Thi Kim Loi NGUYEN,Le Phuong Nghi THACH,Gia Nhu THAI,Thi Thanh Sang TRAN 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.4

This study intends to analyze the impact of the country of origin on the intention to ingest COVID-19 vaccinations by measuring Vietnamese people’s perceptions of India in the manufacture of COVID-19 vaccines. The research is done using a quantitative method, and primary data was obtained using a conventional manner based on the willingness of the research respondents, who are Vietnamese persons aged 18 and up, to contribute information. The findings revealed that perceived brand association and perceived brand quality directly positively impact the COVID-19 vaccine’s consumption intention and willingness. Meanwhile, while the perceived country image component has no direct effect on consumption intention, it does have a positive indirect effect on consumption intention through perceived brand linkage and perceived brand quality. The findings also emphasize the importance and significance of a country’s image in brand association and quality perception. The study’s findings imply that to increase consumers’ willingness to buy India’s COVID-19 vaccination, the country should develop communication initiatives to improve consumer perceptions of the country’s image, the perceived value of the brand association, and brand quality.

Factors Influencing on Consumer's Decision on Vegetarian Diets in Vietnam

NGO, Vu Quynh Thi,VO, Thi Anh Dao,NGO, Anh Phung,NGUYEN, Do Mai Anh,LE, Minh Thu,TO, Thi Phuong Loan,NGUYEN, Thi Thuy Phi Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.2

Recently, vegetarian diets have experienced a dramatic increase in popularity. The aim of the study is to explore and test the relationship between the factors influencing consumers' dietary decisions in Ho Chi Minh City, Vietnam. The questionnaire applied a five-point Likert scale to investigate factors that affect Ho Chi Minh City's citizens when they have a vegetarian diet. 497 respondents (68% female; 61.2% aged 18-22; 82.7% had regular vegetarian diets) living in Ho Chi Minh City took part in both online and offline surveys. The results were processed by SPSS 22.0 software. The reliability was checked by Cronbach Alpha and Exploratory factor analysis (EFA) to identify the underlying relationships between measured variables. The Correlation analysis was implemented to show how strong and degree of two variables are related to each other before the multivariate regression equation was analyzed. The result showed the Five factors that were motivating people in Ho Chi Minh City to decide on plant-based diets, such as Animal Welfare, Health, Religion, Mood, and Reference groups. The mood is the most influential variable that significantly influences people's food choices. Attitudes toward vegetarian diets are changing. Therefore, recognizing the trends in food consumption might help companies take advantage of investment opportunities and build their marketing strategies.

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.

Financing Decision and Labor Cost: Evidence from South Asian Countries

Thi Phuong Vy Le,Xuan Vinh Vo 중앙대학교 경제연구소 2020 Journal of Economic Development Vol.45 No.1

This study investigates the effect of financial leverage on labor costs using a data sample of listed companies from Southeast Asian countries covering the period from 2009 to 2015. Using several techniques for robust results, the results show that financial leverage has a negative effect on labor costs. In addition, the study finds that the negative impact of financial leverage on labor cost tends to be less in state-owned, foreign-owned, and large companies.

Line Impedance Estimation Based Adaptive Droop Control Method for Parallel Inverters

Le, Phuong Minh,Pham, Xuan Hoa Thi,Nguyen, Huy Minh,Hoang, Duc Duy Vo,Nguyen, Tuyen Dinh,Vo, Dieu Ngoc The Korean Institute of Power Electronics 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.

Key Determinants for Users Intention to Use Smarthome Devices in Vietnam

Nguyen, Thi-Hong-Linh,Duong, Minh-Hung,Nguyen, Hai-Dang,Vo, Dang-HongNgan,Vu, Duy-Phuong-Trinh,Le, Hoanh-Su Korea Multimedia Society 2018 The journal of multimedia information system Vol.5 No.4

Smarthome is one of the remarkable fields of the industrial revolution 4.0, which are popular in many countries such USA, EURO, Japan and Korea. However, how Vietnamese people are considering and having intension to use smarthome devices is still a question for marketers and researchers. This study develops a comprehensive research model that can explain potential customers' behavioral intentions to adopt and use Smarthome services in Viet Nam and figure which key factors affect the intention. This study proposes and validates a new theoretical model that extends the Unified Theory of Acceptance and Use of Technology 2 (UTAUT2). The model consists of eight factors that affect one element (Behavioral Intention), specifically: Habits, Perceived usefulness, Perceived ease of use, Trust, Innovativeness Personal, Perceived value, Hedonic motivations and Social influences. Data were collected from 304 Vietnamese citizens by sending the email to survey questionnaire, direct contact with the experienced smarthome users. Through regression analysis, data from samples were analysed with SPSS 20 software and verification of hypotheses, the results show the key determinants affecting the intention to use smarthome appliances in Vietnam: Perceived Value, Social Influence, Perceived Usefulness, Perceived Ease of Use and Trust. From this result, several recommendations have been suggested to to smarthome devices vendors and marketer to improve products as well as marketing approaches to meet customer needs.

The Factors Affecting Intention to Use Smarthome Devices in Vietnam

Nguyen Thi-Hong-Linh,Duong Minh-Hung,Nguyen Hai-Dang,Vo Dang-HongNgan,Vu Duy-Phuong-Trinh,Le Hoanh-Su 한국경영정보학회 2018 한국경영정보학회 학술대회논문집 Vol.2018 No.5