Research on Macroeconomics Factors Influencing Seaborne Trade in Vietnam: An Autoregressive Distributed Lag Approach

Thu Giang VUONG,Toan Thuyen VUONG 국제이네비해양경제학회 2021 International Journal of e-Navigation and Maritime Vol.16 No.1

It would appear that the diversification of the methods of international transport has made global trade much easier. With the outstanding advantages of cargo volumes, shipping costs and safety of goods, sea transport always accounts for a high proportion of the export and import activities of coastal countries. Today, therefore, seaborne trade is the main method of foreign trade in Vietnam and the world. Towards solutions in the area of seaborne trade development, this study aims to find the essential macroeconomics factors influencing directly seaborne trade by applying autoregressive distributed lag (ARDL) models with a case study of Vietnam. This paper finds that Vietnam’s GDP and FDI have positive impacts on Vietnam’s seaborne trade turnover in both the short run and long run. The findings here make a significant contribution to the search for practical scientific solutions to enhance Vietnam’s seaborne trade development.

What Makes Vietnamese (Not) Attend Periodic General Health Examinations? A 2016 Cross-sectional Study

Quan-Hoang Vuong,Quang-Hoi Vu,Thu-Trang Vuong 질병관리본부 2017 Osong Public Health and Research Persptectives Vol.8 No.2

Objectives: General health examinations (GHE) have become an increasingly common measure for preventive medicine in Vietnam. However, little is known about the factors among Vietnamese people who attend or miss GHE. Budget or time constraints remain to be evaluated for better-informed policy making. This study investigates factors affecting behaviors in attending periodic GHE. The main objectives are as follows: (1) to explore empirical relationships between influencing factors and periodic GHE frequencies, and (2) to predict the probabilities of attending GHE under associated conditions. Methods: The study used a 2,068-observational dataset, obtained from a Vietnamese survey in 2016. The analysis was then performed using the methods of baseline-category logits for establishing relationships between predictor and response variables. Results: Significant relationships were found among the expenditure and time consumption, health priority and sensitivity to health data, insurance status, and frequency of GHE, with most p-values = 0.01. Conclusion: Generally, people attended the GHE when they had the resources and health priorities (72.7% probability). Expenditure and time remain key obstacles to the periodic GHE. Health priority and health data are important in improving rates for GHEs. Health insurance should play a positive role in promoting the GHE.

Characteristics of retracted articles based on retraction data from online sources through February 2019

Quan-Hoang Vuong,Viet-Phuong La,Manh-Tung Ho,Thu-Trang Vuong,Manh-Toan Ho 한국과학학술지편집인협의회 2020 Science Editing Vol.7 No.1

Purpose: Although retractions are commonly considered to be negative, the fact remains that they play a positive role in the academic community. For instance, retractions help scientific enterprise perform its self-correcting function and provide lessons for future researchers; furthermore, they represent the fulfillment of social responsibilities, and they enable scientific communities to offer better monitoring services to keep problematic studies in check. This study aims to provide a thorough overview of the practice of retraction in scientific publishing from the first incident to the present. Methods: We built a database using SQL Server 2016 and homemade artificial intelligence tools to extract and classify data sources including RetractionWatch, official publishers’ archives, and online communities into ready-to-analyze groups and to scan them for new data. After data cleaning, a dataset of 18,603 retractions from 1,753 (when the first retracted paper was published) to February 2019, covering 127 research fields, was established. Results: Notable retraction events include the rise in retracted articles starting in 1999 and the unusual number of retractions in 2010. The Institute of Electrical and Electronics Engineers, Elsevier, and Springer account for nearly 60% of all retracted papers globally, with Institute of Electrical and Electronics Engineers contributing the most retractions, even though it is not the organization that publishes the most journals. Finally, reasons for retraction are diverse but the most common is “fake peer review”. Conclusion: This study suggests that the frequency of retraction has boomed in the past 20 years, and it underscores the importance of understanding and learning from the practice of retracting scientific articles.

Development of New Haptic Interface using "Dielectric Elastomers

nguyen Huu Lam Vuong,Nguyen Huu Chuc,Sungmoon Jin,Baek Chul Kim,Duk Sang Kim,Kuang Jun An,Vuong Hong Phuc,Ja Choon Koo,Hyungpil Moon,Youngkwan Lee,Jae Do Nam,Hyouk Ryeol Choi 제어로봇시스템학회 2009 제어로봇시스템학회 합동학술대회 논문집 Vol.2009 No.12

Ecology and Behavior Overwintering Two Aphid Species, Lipaphis pseudobrassicae and Myzus persicae(Homoptera: Aphididae), in Southern Greenhouse Area in Korea

Vuong, Pham-Thi,Kim, Jinho,Yoohan Song Korean Society of Applied Entomology 2003 Journal of Asia-Pacific Entomology Vol.6 No.1

In southern Korea, the two aphid species, Myzus Pessicae(Sulzer) and Lipaphis Pseudobrassicae (Davis), had been known to have sexual phase to produce hibernating eggs on their alternate hosts. However, we have fequently found that they were still alive in the parthenogenetic form even in below freezing conditions in winter. This study had been focused on verifying the possibility of overwintering of the two important aphid species in the parthenogenetic morph, by comparing the population density changes within greenhouse and open field condition. In green- house condition, though not heated, both species successfully continued reproducing in a parthenogenetic form. In open field, L. pseudobrassicae successfully survived and reproduced on chinese cabbage and spinach even below freezing temperatures. M. persicae were also able to survive in the winter but not as much capability of reproduction as L. preudobrassicae. This study provided the evidence that the aphid infestations in greenhouse can be mostly from overwintering populations in the parthenogenetic morph in southern greenhouse area of Korea.

A Model of Factors Affecting Entrepreneurial Intention among Information Technology Students in Vietnam

VUONG, Bui Nhat,PHUONG, Nguyen Ngoc Duy,HUAN, Dao Duy,QUAN, Tran Nhu Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.8

In recent decades, the research field of entrepreneurship phenomenon has significantly increased in both quantity and sophistication. In Vietnam, paradoxically, while creating a new business venture has become a tendency, the interest in studying entrepreneurs seems not to be thoroughly investigated. This research aims to evaluate the factors that affect the entrepreneurial intention of information technology (IT) students in Vietnam. The authors make use of mixed methods including both quantitative research method and qualitative research method. The qualitative research method is employed to identify meanings, confirmations, adjustments, and compliments for concept-measurement variables in the conceptual model. Quantitative research is conducted from a sample of 424 IT senior students across many universities in Vietnam. Questionnaires have been sent to students to evaluate the measurement scale and appropriateness of the research model. Results from multiple regression highlighted five independent variables affecting the dependent variable, the entrepreneurial intention, in a descending order as following: entrepreneurial educational environment, personal characteristics, perception of feasibility, entrepreneurial supports, and financial accessibility. In addition, this research has proved that the variable attitudes towards entrepreneurship partially mediated among the interrelationship of the aforementioned variables. From this research, the authors make some recommendations to enhance entrepreneurial intentions of IT students in Vietnam.

Food system of Hmong people in Ha Giang province, Vietnam

Vuong Xuan Tinh 漢陽大學校 民族學硏究所 1997 民族과文化 Vol.6 No.-

Pt-AlGaN/GaN HEMT-based hydrogen gas sensors with and without SiNx post-passivation

Vuong, Tuan Anh,Kim, Hyungtak Institute of Korean Electrical and Electronics Eng 2019 전기전자학회논문지 Vol.23 No.3

GaN-based sensors have been widely investigated thanks to its potential in detecting the presence of hydrogen. In this study, we fabricated hydrogen gas sensors with AlGaN/GaN heterojunction and investigated how the sensing performance to be affected by SiN surface passivation. The gas sensor employed a high electron mobility transistors (HEMTs) with 30 nm platinum catalyst as a gate to detect the hydrogen presence. SiN layer was deposited by inductively-coupled chemical vapor deposition as post-passivation. The sensors with SiN passivation exhibited hydrogen sensing characteristics with various gas flow rates and concentrations of hydrogen in inert background gas at $200^{\circ}C$ similar to the ones without passivation. Aside from quick response time for both sensors, there are differences in sensitivity and recovery time because of the existence of the passivation layer. The results also confirmed the dependence of sensing performance on gas flow rate and gas concentration.

우리나라 옥외 무선광통신 시스템의 링크 가용성

Vuong V. Mai,Dung T. Ha,김훈(Hoon Kim) 한국광학회 2018 한국광학회지 Vol.29 No.2

본 연구에서 서울, 부산, 대전의 5년치 날씨 정보를 활용하여 우리나라 옥외 무선 광통신 시스템의 링크 가용성을 이론적으로 분석하였다. 이를 위하여 기상 상태와 시계(visibility)를 이용하여 대기의 흡수와 산란이 유발하는 광전력 감쇠를 계산하였다. 또한 날씨 정보를 활용하여 신틸레이션에 의한 수신 광전력 변화를 예측하였다. 대기의 흡수 및 산란에 의한 광전력 손실과 신틸레이션에 의한 광전력 변화가 서로 무관하다는 가정 하에 수신 광전력과 수신 감도를 비교하여 링크 가용성을 도출하였다. 분석결과 10 dBm 송신기 출력과 7 cm 수광 직경을 가진 수신기를 사용한 3.5 km 시스템의 링크 가용성은 대전에서 95% 이상으로 예측되었다. 부산과 서울의 경우 대전보다 열악한 시계로 인하여 낮은 링크 가용성을 보였다. We analyze the link availability of terrestrial free-space optical (FSO) communication systems in Korea. For this purpose, we utilize several theoretical models to calculate the power losses induced by absorption and scattering in the atmospheric channel, using five-year meteorological data for three major cities in Korea (Seoul, Busan, and Daejeon). Also, we estimate the power variations at the receiver caused by scintillation in the data. Those power losses and variations are used to estimate the availability of FSO links in the three cities. The results show that link availability is estimated to be over 95% in Daejeon for a 3.5-km FSO link, when the transmitter power and receiver diameter are greater than 10 dBm and 7 cm respectively. Slightly worse link availabilities are obtained for Busan and Seoul.

Factors Affecting Savings Deposit Decision of Individual Customers: Empirical Evidence from Vietnamese Commercial Banks

VUONG, Bui Nhat,TUNG, Dao Duy,GIAO, Ha Nam Khanh,DAT, Ngo Tan,QUAN, Tran Nhu Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.7

Capital mobilization is a traditional business of commercial banks and is one of the core foundations for the development of a bank. Capital mobilization is the main input in the operation of a bank, and this is also the basis for generating output for credit activities as well as other banking activities. This study aims to determine the main factors that affect the decisions of individual customers to put savings deposit in Vietnamese commercial banks. Survey data collected from 403 individual customers were analyzed to provide evidence. The results from the multiple regression analysis by using SPSS software revealed that all scales in this study were reliable, and there were six components impacting the savings deposit decision of individual customers from the strongest to the weakest in the following order: the form of promotion, bank brand, service quality, interest rate policy, and employee knowledge and attitude. Besides, the finding showed customers who have high income tend to have a stronger decision on savings deposits in commercial banks. The main findings of this article provide some empirical implications for marketers in banks and serve as a suggestion to improve these factors in order to retain and attract individual customers' savings deposit decisions.