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DOAN, Quyen Thuc,HO, Thu Thi Hoai,DOAN, Quynh Huong Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.8
This study aims to examine the influence of capital structure on the business efficiency of joint stock commercial banks listed on the Vietnamese stock market. The article uses data collected from the financial statements of 15 prominent joint-stock commercial banks out of 27 joint-stock commercial banks listed in Vietnam from 2011 to 2021. The research uses E-view software in quantitative analysis to build regression models to determine the relationship and the impact of capital structure factors on the business efficiency of listed joint stock commercial banks. Research results show that ROA is affected by 2 variables of capital structure. It is the sum of customer deposits to total assets and total liabilities to total equity. Total debt to total equity and total customer deposits to total assets both have a negative effect on ROA. For the regression results of ROA with all control variables, the control variables have a positive relationship with the dependent variable. The article has provided recommendations based on the research findings to determine the proper capital structure. Managers must solve the outstanding amount of mobilized capital in previous years, combined with the bad debt handling activities that have arisen.
Fiscal Policy and Economic Growth: Threshold Regression Model Approach
Doan Van DINH 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.4
This study investigates countries’ optimal tax-to-GDP ratio threshold to explore whether exceeding the optimal threshold revenue tax-to-GDP ratio causes reduced GDP growth and compares the optimal threshold revenue tax of countries with the match solution. Apply threshold regression model, unit root test, and cointegration test to explore the impact of the tax revenue-to-GDP ratio on GDP growth, besides the data set is collected time series yearly from 1994 to 2020 in Vietnam, the USA, and South Africa to estimate the optimal threshold tax revenue. The tax revenue to GDP and GDP growth has a close related: South Africa, USA, and Vietnam are corresponding 49%, 58%, 46%, and countries’ optimal thresholds of tax revenue to GDP are corresponding 24%, 10.3 %, and 19%. All variables are sta-tionary at the first difference, that is, the lag after one year. In addition, the cointegration test shows that the relation-ship between Vietnam’s and the US’s tax-to-GDP variable and economic growth is the relationship in the long-run and that of South Africa is the relationship in the short term. The results appropriately support the fiscal policy. The study identifies issues for managers, investors to consider having a comprehensive solution among macro cosmic policies, tax policy, investment policy, and other policies to control and balance the relationship between tax revenue to GDP and GDP growth; and having appropriate policies to regulate funds to stimulate investment over the long term.
Doan Tham Thi Mong,Tran Gia Han,Nguyen Toan Khac,Lim Jin Hee,Lee Sanghyun 한국응용생명화학회 2024 Applied Biological Chemistry (Appl Biol Chem) Vol.67 No.-
Chrysanthemum morifolium is classified within the Asteraceae botanical family and serves as a phytomedicine in many countries. The objective of this study was to quantitatively analyze twelve phenolic compounds through HPLC/ UV and to assess the antioxidant abilities using the DPPH and ABTS+ assays in the leaves and flowers of six cultivars of C. morifolium: ‘Geumsu’, ‘Ilonka’, ‘Silvia’, ‘Pompadour’, ‘Yes Holic’, and ‘Ford’. The results indicated that the leaves of ‘Geumsu’ and ‘Ford’, as well as the ‘Pompadour’ flowers contained high levels of phenolic compounds and exhibited strong antioxidant abilities. Additionally, a relationship between the phenolic compounds and antioxidant activities was observed. These findings provide foundational knowledge about C. morifolium cultivars, which are promising natural sources that can offer health benefits.
Doan Ngoc Chi Nam,Dinh Quang Truong,Yoon Jong Il,Ahn Kyoung Kwan 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
An ionic polymer metal composite (IPMC) actuator is an Electro-Active Polymer (EAP) that bends in response to a small applied electrical field as a result of mobility of cations in the polymer network. This paper proposes a dynamic fuzzy Nonlinear Auto Regressive Exogenous (NARX) model for modeling and identifying the nonlinear behavior of on type IPMC actuator. Firstly, a set of open loop input voltage signals were applied to the IPMC in order to investigate the IPMC bending actuation. Consequently, a proper fuzzy NARX model was constructed and an identification scheme based on Particle Swam Optimization (PSO) algorithm was developed. Validation results proved the ability of proposed scheme to capture the bending behaviors of IPMC actuator.
On a family of cohomological degrees
Doan Trung Cuong,Pham Hong Nam 대한수학회 2020 대한수학회지 Vol.57 No.3
Cohomological degrees (or extended degrees) were introduc\-ed by Doering, Gunston and Vasconcelos as measures for the complexity of structure of finitely generated modules over a Noetherian ring. Until now only very few examples of such functions have been known. Using a Cohen-Macaulay obstruction defined earlier, we construct an infinite family of cohomological degrees.
Anomalous Trajectory Detection in Surveillance Systems Using Pedestrian and Surrounding Information
Doan Trung Nghia,Sunwoong Kim,Vo Le Cuong,Hyuk-Jae Lee 대한전자공학회 2016 IEIE Transactions on Smart Processing & Computing Vol.5 No.4
Concurrently detected and annotated abnormal events can have a significant impact on surveillance systems. By considering the specific domain of pedestrian trajectories, this paper presents two main contributions. First, as introduced in much of the work on trajectory-based anomaly detection in the literature, only information about pedestrian paths, such as direction and speed, is considered. Differing from previous work, this paper proposes a framework that deals with additional types of trajectory-based anomalies. These abnormal events take places when a person enters prohibited areas. Those restricted regions are constructed by an online learning algorithm that uses surrounding information, including detected pedestrians and background scenes. Second, a simple data-boosting technique is introduced to overcome a lack of training data; such a problem particularly challenges all previous work, owing to the significantly low frequency of abnormal events. This technique only requires normal trajectories and fundamental information about scenes to increase the amount of training data for both normal and abnormal trajectories. With the increased amount of training data, the conventional abnormal trajectory classifier is able to achieve better prediction accuracy without falling into the over-fitting problem caused by complex learning models. Finally, the proposed framework (which annotates tracks that enter prohibited areas) and a conventional abnormal trajectory detector (using the data-boosting technique) are integrated to form a united detector. Such a detector deals with different types of anomalous trajectories in a hierarchical order. The experimental results show that all proposed detectors can effectively detect anomalous trajectories in the test phase.
( Doan Tuan Linh ),이한얼,김태근 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Titanium oxide, forming on surface of the Ti-PTL during the operation, is contributed to high Ohmic resistance of the cell. Covering a thin layer of high corrosion-resistive metal on PTL surface is typical method to prevent this phenomena. Iridium and its compound are usually used in PEMWE due to the low electrical resistivity and high stability under harsh condition. In this study, combining spray-coating and calcination method, IrO2 was deposited on the commercial Ti-PTL surface to limit passivation. 3 samples with different catalyst loading (0.08 mg/cm2, 0.17 mg/cm2, 0.28 mg/cm2) were investigated to access the effect of catalyst loading on the water electrolysis cell performance. The polarization curve results showed that the high catalyst loading (0.28 mg/cm2) and low loading (0.08 mg/cm2) show lower performance than the loading of 0.17 mg/cm2 with about 40mV at 2 A/cm2, despite of the Ohmic resistance increase with the increasing of catalyst loading.
Doan, Manh-Ha,Jin, Youngjo,Adhikari, Subash,Lee, Sanghyub,Zhao, Jiong,Lim, Seong Chu,Lee, Young Hee American Chemical Society 2017 ACS NANO Vol.11 No.4
<P>Despite numerous studies on two-dimensional van der Waals heterostructures, a full understanding of the charge transport and photoinduced current mechanisms in these structures, in particular, associated with charge depletion/inversion layers at the interface remains elusive. Here, we investigate transport properties of a prototype multilayer MoS2/WSe2 heterojunction via a tunable charge inversion/depletion layer. A charge inversion layer was constructed at the surface of WSe2 due to its relatively low doping concentration compared to that of MoS2, which can be tuned by the back-gate bias. The depletion region was limited within a few nanometers in the MoS2 side, while charges are fully depleted on the whole WSe2 side, which are determined by Raman spectroscopy and transport measurements. Charge transport through the heterojunction was influenced by the presence of the inversion layer and involves two regimes of tunneling and recombination. Furthermore, photocurrent measurements clearly revealed recombination and space-charge-limited behaviors, similar to those of the heterostructures built from organic semiconductors. This contributes to research of various other types of heterostructures and can be further applied for electronic and optoelectronic devices.</P>