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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.
Doan, Huong Thi Thanh,Noh, Jin Hyeong,Choe, Se Eun,Yoo, Mi Sun,Kim, Young Ha,Reddy, Kondreddy Eswar,Van Quyen, Dong,Nguyen, Lien Thi Kim,Nguyen, Thuy Thi Dieu,Kweon, Chang Hee,Jung, Suk Chan,Chang, Ki Elsevier 2013 Veterinary parasitology Vol.196 No.3
<P><B>Abstract</B></P> <P>Ticks are vectors of various pathogens that affect humans and animals throughout the world. <I>Anaplasma bovis</I> is one of the most important tick-borne pathogens that cause cattle diseases but there is still very little information available about this agent in Korea. In the present study, 535 <I>Haemaphysalis longicornis</I> tick pools were analyzed from grazing cattle in five Korean provinces. <I>A. bovis</I> was detected in 50 (9.3%) of 535 tick pools using 16S rRNA-based PCR. <I>A. bovis</I> infections were detected for the first time in ticks feeding on cattle in Chungbuk, Geongbuk, and Jeonbuk provinces in Korea. The 50 positive PCR products were sequenced successfully and compared with sequences in GenBank. Phylogenetic analysis of the Korean isolates classified them into four genotypes with nucleotide sequence identities of 99.4–100%. Two of the four genotypes had high similarity (99.8–100%) with known sequences. The other two genotypes have never been identified.</P>
Doan Huy Hien,장성형 한국자원공학회 2011 한국자원공학회지 Vol.48 No.4
Reverse Time Migration (RTM) is a method for imaging subsurface using crosscorrelation between source wavefields extrapolation in forward and recorded receiver wavefields extrapolation in backward. RTM is widely used for complex subsurface structures in isotropic media. However, since the earth interior is intrinsically anisotropy, we need to consider anisotropic problem for migration. In this study we developed two RTM algorithms in vertical transversely isotropic (VTI) media. The one is the inner product of the partial derivative wavefields and observed wavefields, the other is the inner product of the virtual source and back propagation wavefields. Numerical model test for a simple anisotropic geological model shows that the results from two algorithms are almost the same to each other. This means that the latter one is more effective than the first one. We can apply the VTI RTM to complex geological structures with horizontal velocity variations in VTI media without calculation of partial derivative wavefields. 역시간 구조보정은 음원영역 파동장 외삽과 수진기영역 파동장 외삽의 상호상관으로 지층구조를 영상화하는 방법으로 복잡한 등방성 매질 층서구조를 영상화하는데 주로 이용된다. 그러나 일반적으로 지구내부 지층구조는 이방성 특성을 지니고 있으므로 이방성을 고려한 구조보정 기술이 필요하다. 여기에서는 편미분 파동장과 음원모음의 내적에 의한 알고리즘과 가상음원과 역전파 파동장과의 내적에 의한 알고리즘을 이용하여 횡적등방성 매질에서 역시간 구조보정 기술을 개발하고자 하였다. 단순 이방성 지층모델에 대한 수치모형실험 결과, 두 가지 방법에 의한 지층단면도 영상은 거의 차이가 없어 가상음원과 역전파 파동장과의 내적으로 구조보정을 실시하는 것이 효과적임을 알 수 있었다. 수평적으로 속도가 변하는 이방성 매질 지층구조에서 편미분 파동장을 구하지 않고 영상화 할 수 있음을 알 수 있었다.
A Wideband On-Chip Directional Coupler Using a Negative Capacitance Circuit
Doan, Nhut-Tan,Lai, Ngoc-Duy-Hien,Kim, Hyoungsoo,Yoon, Sang-Woong IEEE 2019 IEEE transactions on microwave theory and techniqu Vol.67 No.1
<P>We propose a wideband lumped element directional coupler using lossy negative capacitance (NCAP). NCAP provides a broadband resonance effect combined with passive inductors and capacitors in a circuit, enabling the coupler to exhibit wideband directivity performance. In addition, a 3-dB loss in the NCAP enhanced the bandwidth at the expense of the transmission gain, which decreased by only 0.3 dB. The proposed coupler was implemented in the IBM 7RF 180-nm CMOS technology. The size of the core chip is <TEX>$1180\,\,\mu \text {m} \times 570\,\,\mu \text{m}$</TEX>. The designed NCAP provides a capacitance of −13 pF using a supply voltage of 2.7 V and a current of 9.6 mA. The coupling was designed to be −10 dB at the center frequency of 1 GHz. The bandwidth was defined by the frequency range, which exhibited a directivity of more than 30 dB. The S-parameter measurements showed an absolute bandwidth ranging from 0.86 to 1.12 GHz, and a fractional bandwidth of 26%. In the bandwidth, the coupling had a 0.5-dB variation, the transmission loss was smaller than 2.14 dB, and the noise figures were 1.8–2.5 dB.</P>
A novel design technique for IPMC diaphragm in micropump application
Doan Ngoc Chi Nam,Yoon Jong Il,Ahn Kyoung Kwan 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Micropumps have gained a great potential to be applied as biomedical devices and micro systems. Because of low driven voltage, flexible operation, and self sensing ability, the ionic polymer metal composite (IPMC) material has been used as diaphragm of micropumps. This paper presents a novel design technique of IPMC diaphragm with numerical results about deformation capabilities and makes the design process of IPMC diaphragm be more convenient. The technique starts from a physical induced stress model of IPMC actuators, where the induced stress information inside the IPMC can be obtained corresponding to the input voltage signal. The induced stress model is achieved by solving the partial differential equation (PDE) of charging density along the IPMC thickness. Next, the induced stress information is imported into the ANSYS finite element model as deforming mechanism. Via ANSYS environment, the deformation of IPMC actuator can be visually analyzed. Using this technique, a novel design of IPMC diaphragm is then investigated and the optimized design of IPMC diaphragm for micropump is obtained.
Impacts of Economic Integration on Vietnam`s Trade Flows
( Doan Quang Huy ),( Tai Koo Chang ) 한국외국어대학교 동남아연구소 2013 東南亞硏究 Vol.22 No.3
All economies interested in economic integration, such as ASEAN, EU, NAFTA, etc. Economy may better off or worse off due to economic integration. For understanding whole picture of Vietnam economic integration, the paper evaluates aggregate impacts of regional and global integrations (WTO, APEC, ASEAN+3, BTAs) on Vietnamese bilateral trade flows by quantitative analysis using Fixed and Random Effect Estimation with sample data from 53 countries within 15 years (1997- 2011) following the gravity model (exports and imports are analyzed separately). As a result, economic integration is a major positive factor in Vietnamese economic growth in recent years. Bases on these analyses, this paper suggests some useful solutions to Vietnam`s government. Vietnam can and needs to follow the highly successful economic example of South Korea.
Some fixed point theorems for weakly Picard operators in complete metric spaces and applications
Doan Trong Hieu,Bui The Hung 대한수학회 2022 대한수학회논문집 Vol.37 No.1
In this paper, we prove new fixed point theorems for single-valued and multi-valued weakly Picard operators in complete metric \linebreak spaces and give several examples. As applications, we give several results to Fredholm integral equation.
Doan, Van-Tuan,Kim, Ki-Young,Choi, Woojin,Kim, Dae-Wook The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1
The three-phase four-leg voltage-source inverter topology is an interesting option for the three-phase four-wire system. With an additional leg, this topology can achieve superior performance under unbalanced and nonlinear load conditions. However, because of the low bandwidth of conventional controllers in high-power inverter applications, the system cannot guarantee a balanced output voltage under the unbalanced load condition. Most of the methods proposed to solve this problem mainly use the multiple synchronous frame method, which requires several controllers and a large amount of computation because of frame transformation. This study proposes a simple hybrid controller that combines proportional-integral (PI) and resonant controllers in the synchronous frame synchronized with the positive-sequence component of the output voltage of the three-phase four-leg inverter. The design procedure for the controller and the theoretical analysis are presented. The performance of the proposed method is verified by the experimental results and compared with that of the conventional PI controller.