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HOANG, Thi Thuy,HOANG, Lien Thi,PHI, Thi KimThu,NGUYEN, Minh Thu,PHAN, Minh Quang Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10
This objective of this study is to enrich the literature by the debt ratio and enterprise performance of Joint stock companies of Vietnam National Coal and Mineral Industries Holding Corporation Limited (Vinacomin). The debt ratio is an important index of capital structure, and it influences and decides the enterprise performance. Therefore, the determination of reasonable debt ratio level is beneficial to the stable operation of Vinacomin's enterprises. Based on the research conclusion about the effect on capital structure of debt ratio from domestic and foreign scholar, collecting data from 2014-2018 of Vinacomin's enterprises as a research sample, the article conducts research on the relationship between debt ratio and business performance of Vinacomin, as measured by return on total Assets. In addition, the study uses free cash flow, company size, growth opportunity, investment opportunities, operating costs to sales ratio as control variables.The study shows the debt ratio of Joint stock companies of Vietnam National Coal and Mineral Industries Holding Corporation Limited has a negative effect on the enterprise performance. Furthermore, the research results of the article are references for Vinacomin' enterprises in the course of production and business activities, determining a reasonable debt ratio, and improving the operational performance of enterprises.
Growth of Loan Distribution and Bank Valuation: Evidence from Vietnam
Lam Xuan HOANG,Phi Dinh HOANG,Duong Quy DANG 한국유통과학회 2020 유통과학연구 Vol.18 No.5
Purpose: The aim of this article is to test the link between growth of loan distribution and Bank Valuation in Vietnam‟s banking sector. At the same time, the study also compared the differences in the effect of growth of loan to valuation bank in banks of different sizes, ownership rates and bank values. Research design, data and methodology: With panel data estimation techniques along with robust standard error for a sample of the banks listed on Vietnam stock exchange from 2012 to 2019. Results: Growth of loan has a positive impact on Bank Valuation (by Tobin‟s Q). A closer investigation provides evidence for the differential valuation effect of loan growth depending on different features of banks. Specifically, loan growth is found positively and significantly associated with Bank Valuation in small and non-state-owned banks only. Besides, bank size, deposit, and return on equity are found negatively associated with Tobin‟s Q, while loan loss provisions exhibit a positive relation with this measure of Bank Valuation. Conclusions: These findings provide contributions to the literature on the existence of the effect of loan growth on Bank Valuation. At the same time, the study also provides practical implications for policy makers in banks and investors
Phi Duc Long,Dao Thi Loi,To Minh Manh,Nguyen Thanh Binh,Nguyen Duy Cuong,Gautret Philippe,Hoang Van Thuan 대한의학회 2023 Journal of Korean medical science Vol.38 No.49
Geographical and racial factors constitute important distinctions between Kawasaki disease (KD) and multisystem inflammatory syndrome in children (MIS-C), but no study has been conducted in Vietnam. Forty-one children with KD from January 2018 to July 2020 and 42 with KD/MIS-C from August 2020 to December 2022 were included in this study. Of the patients, 52.3% were aged between 12 and 35 months. Only two were aged over 5 years, and both were belong to the KD/MIS-C group. A 59.5% of the patients were male. Apart from fever, all symptoms tended to be more frequent in patients with KD/MIS-C. The prevalence of diffuse skin rash, hand and foot edema or erythema and gastrointestinal signs was significantly higher in patients hospitalized with KD/MIS-C. There was no significant difference in laboratory findings between the two groups. Coronary artery dilation was more frequently observed in patients with KD/MIS-C compared to those with KD (40.5% vs. 14.6%, P = 0.009).
Building Firm’s Competitive Advantages through Supplier Development
Nguyen,Phi Hoang 한국유통과학회 2019 KODISA ICBE (International Conference on Business Vol.2019 No.-
Nowadays competition is becoming tougher in all areas of business. To survive in a such difficult period, all firms must think how to create and secure the competitive advantage for their own. One of the ways to build competitive advantage for firm is to develop suppliers which we can call supplier development. This research will analyze the importance of supplier development for buying firm, propose a research framework with three hypotheses need to be tested. One tested, the practitioners and researchers can know that which supplier development activities can be selected to do to create the competitive advantage for firm.
The Development of Accurate GPS Module Using Discrete-Time H<SUB>∞</SUB> Filter
Nguyen Hoang(윈황휴),Nguyen Phi Long(윈필롱),Lee Sang-Hoon(이상훈),Park Ok-Deuk(박옥득),Kim Hyun-Su(김현서),Kim Han-Sil(김한실) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
In this paper, we present the traditional CPS Position-Velocity (PV) model to apply for both Discrete-Time Kalman Filter and Discrete-Time H<SUB>∞</SUB> Filter. The positioning algorithms of both filters are proposed for a stand-alone low-cost CPS module to increase its accuracy. For disturbance cancellation, the Kalman Filter requires the statistical information about process and measurement noises while the H<SUB>∞</SUB> Filter only requires that these noises are bounded. Experiments show that with the same measurement data, H<SUB>∞</SUB> Filter gives us better positioning results compared with Least-Squared method and Kalman Filter.
Lan Thi Hoang BUI,Phi-Hung NGUYEN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.9
Rapid economic growth in recent years has caused a surge in energy consumption among Southeast Asian countries and laid a considerable burden on the already inadequate power infrastructure. As a result, frequent blackouts and prolonged outages have become common and weakened firm productive performance in those years. The main objective of this study is to examine the impact of power infrastructure quality on the performance of Southeast Asian manufacturing firms. In this study, the World Bank Enterprise Surveys was employed as the training dataset of 4723 manufacturing firms in the period of 2015–2016. The results of this study reveal that industrial firms that suffered from power outages had consistently lower productivity. As measured by the length of such events, more severe outages tend to be more harmful to the firm. Furthermore, the findings also indicated that most firms relied on self-generated electricity to reduce the negative impact of power outages, but this does not bring many benefits when operating at a small scale in some countries. Consequently, this study contributes to a growing literature that examines the economic impact of public infrastructure and how detrimental the poor state of such services is to a firm’s downstream operations, productivity, and growth.
Hardware and Software Implementation of a GPS Receiver Test Bed Running from PC
윈필롱(Nguyen Phi Long),윈황휴(Nguyen Hoang Hieu),이상훈(Lee SangHoon),박옥득(Park OkDeuk),김현수(Kim HyunSu),김한실(Kim HanSil) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
When developing a new GPS receiver module, the essential problems are evaluation of reliable algorithms, software debugging, and performance comparison between algorithms to find optimal solution. Most GPS receiver modules nowadays use a correlator to track signals from satellites and an MCU (Micro Controller Unit) to control operations of the entire module. The problem of software evaluation from MCU is very difficult, due to limitation of MCU resources and low ability of interfacing with user. Normally, user has to expense special tool kit for a limiting access to MCU but it is also hard 10 use. This article introduces an implementation of a GPS receiver lest bed using correlator GP2021 interfacing with ISA (Industry Standard Architecture) PC bus. This way can give user complete control and visibility into the operation of the receiver, then user can easily debug program and test algorithms. For this article, the least square method is implemented to lest the hardware and software performance.
Simple desired manipulability ellipsoid with velocity and force for control of redundant manipulator
Yun Seok Choi,이이삭,Phi Tien Hoang,Hyoukryeol Choi 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
Redundant manipulators are used in several areas because they can work with various postures. They are dexterous and can avoid crashing with obstacles during working in a complex environment. However, suitable redundant joints are difficult to identify. Manipulability is widely used to evaluate the posture of redundant manipulators. This approach aims to generate the motion of a manipulator with its trajectory and to determine its optimal posture. However, achieving these objectives is complex, and calculations involved are time consuming. In this study, a simple desired manipulability ellipsoid is proposed to reduce these shortcomings. The manipulator interacts with an object or its own inertia, and the suitable manipulability ellipsoid is related with these values. Therefore, this ellipsoid is calculated by using the desired force and velocity. In this manner, the redundant joint is controlled, and the current manipulability ellipsoid is similar to the desired manipulability ellipsoid, thereby enabling to approximately determine the optimal manipulability. The proposed method is tested by simulation and real model with four degrees of freedom manipulator. Subsequently, the similarity is validated.
Farhad Taghizadeh-Hesary,Nguyet Thi Minh Phi,Hanh Hoang Thi Hong,Vu Tuan Chu 세종대학교 경제통합연구소 2019 Journal of Economic Integration Vol.34 No.4
This paper assesses the impact of financial integration on financial development and establishes thresholds for materializing gains of financial advances from financial globalization using a sample of 34 countries from the East Asian and Pacific region. Following the approaches of Kose et al. (2011) and Asongu and De Moor (2016), we test non-linearity within the financial openness and financial development nexus through semi-parametric ordinary least-squares regression, and then, we develop threshold dynamics models. According to our findings, the effect of financial integration on financial development significantly changes across different financial inflows. When using external debt as a proxy for financial openness, there exists a robust significant inverted U-shaped relationship between financial integration and financial development. The empirical findings also suggest that the financial integration-development nexus is contingent on the level of trade openness, national income, and institutional quality. The results are robust to different measures of financial development and integration, the inclusion of other determinants of financial development, and considerations of endogeneity.
GPS 칩셋을 이용한 L1 C/A 코드 GPS 수신기 설계
김현수(Kim HyunSu),윈필롱(Nguyen Phi Long),이상훈(Lee SangHoon),박옥득(Park OkDeuk),윈황휴(Nguyen Hoang Hieu),김한실(Kim HanSil) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
This paper is to design a low cost GPS/DGPS receiver using GP2021 correlator. By modifying the existent GPS, the performance can be enhance than before. The H/W and S/W should be updated to have good result