Impacts of Capital Structure on Business Efficiency of Listed Joint Stock Commercial Banks in Vietnam Stock Market

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.

Liquefaction assessment using alternative approaches: a case study of Ho Chi Minh City stratigraphy

Nhat-Phi Doan,Duy Triet Doan,Van Nam Nguyen,박성식 한국지질과학협의회 2024 Geosciences Journal Vol.28 No.3

Liquefaction has been known as a phenomenon in which the shear strength and stiffness of saturated soil are reduced by the generation of pore water pressure under earthquake loading. Consequently, liquefaction-induced settlement can result in severe damage including building cracks or slope failure, which pose a threat to human lives and properties. In the current Vietnamese standard TCVN 9386:2012, liquefaction potential hazard is often evaluated using the simplified method, which solely identifies the areas with a high risk of liquefaction. Prediction of Safety Factor (FS), Settlement (S), Liquefaction Potential Index (LPI), and Liquefaction Severity Number (LSN) has not received sufficient attention to a completeness standard. This study assesses the liquefaction of the site at Ho Chi Minh City, Vietnam by using four conventional methods: the simplified procedure, linear equivalent analysis, loosely-coupled effective stress analysis, and fully-coupled effective stress analysis based on standard penetration test (SPT) data in Ho Chi Minh Metropolitan City. A class of seismic events that are compatible with the design response spectrum in the Vietnamese standard TCVN 9386:2012 is used as input ground motion at the bedrock. According to the results of different methods, maps of ground settlement, LPI, and LSN are proposed as useful references for construction works on such soils, which may have a high potential for liquefaction and subsidence.

Hole-Filling Algorithm with Spatio-Temporal Background Information for View Synthesis

DOAN, Huu-Noi,NGUYEN, Tien-Dat,HONG, Min-Cheol 'Institute of Electronics, Information and Communi 2017 IEICE transactions on information and systems Vol.100e.d No.9

<P>This paper presents a new hole-filling method that uses extrapolated spatio-temporal background information to obtain a synthesized free-view. A new background codebook for extracting reliable temporal background information is introduced. In addition, the paper addresses estimating spatial local background to distinguish background and foreground regions so that spatial background information can be extrapolated. Background holes are filled by combining spatial and temporal background information. Finally, exemplar-based inpainting is applied to fill in the remaining holes using a new priority function. The experimental results demonstrated that satisfactory synthesized views can be obtained using the proposed algorithm.</P>

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.

A hardware-oriented concurrent TZ search algorithm for High-Efficiency Video Coding

Doan, Nghia,Kim, Tae Sung,Rhee, Chae Eun,Lee, Hyuk-Jae Springer (Biomed Central Ltd.) 2017 EURASIP journal on advances in signal processing Vol.2017 No.1

<P>High-Efficiency Video Coding (HEVC) is the latest video coding standard, in which the compression performance is double that of its predecessor, the H.264/AVC standard, while the video quality remains unchanged. In HEVC, the test zone (TZ) search algorithm is widely used for integer motion estimation because it effectively searches the good-quality motion vector with a relatively small amount of computation. However, the complex computation structure of the TZ search algorithm makes it difficult to implement it in the hardware. This paper proposes a new integer motion estimation algorithm which is designed for hardware execution by modifying the conventional TZ search to allow parallel motion estimations of all prediction unit (PU) partitions. The algorithm consists of the three phases of zonal, raster, and refinement searches. At the beginning of each phase, the algorithm obtains the search points required by the original TZ search for all PU partitions in a coding unit (CU). Then, all redundant search points are removed prior to the estimation of the motion costs, and the best search points are then selected for all PUs. Compared to the conventional TZ search algorithm, experimental results show that the proposed algorithm significantly decreases the Bjontegaard Delta bitrate (BD-BR) by 0.84%, and it also reduces the computational complexity by 54.54%.</P>

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.

Effect of various catalyst loading of IrO₂ in catalyst coated titanium porous transport layer (PTL) on the PEMWE performance

( Doan Tuan Linh ),김태근 한국공업화학회 2021 한국공업화학회 연구논문 초록집 Vol.2021 No.1

Effect of Nb addition on the Microstructure and the Magnetic Properties of Nd-Fe-B-Based Nanocomposites

Doan Minh Thuy,Nguyen Huy Dan 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5

Nd₁₂-xNbxFe82B6 alloys with x = 0, 1.5, 3 and 4.5 were prepared by using a melt-spinning method with dierent quenching rates. The microstructure of the materials was investigated by using X-ray diraction and electron microscopy techniques. The magnetic properties of the material were characterized by magnetic hysteresis and thermomagnetization measurements. The obtained results show that Nb can considerably reduce the critical quenching rate and eectively control the formation of nanocrystallites in the material. Coercivities larger 10 than kOe and maximum energy products above 13 MGOe can be achieved for the material with Nb-addition. Nd₁₂-xNbxFe82B6 alloys with x = 0, 1.5, 3 and 4.5 were prepared by using a melt-spinning method with dierent quenching rates. The microstructure of the materials was investigated by using X-ray diraction and electron microscopy techniques. The magnetic properties of the material were characterized by magnetic hysteresis and thermomagnetization measurements. The obtained results show that Nb can considerably reduce the critical quenching rate and eectively control the formation of nanocrystallites in the material. Coercivities larger 10 than kOe and maximum energy products above 13 MGOe can be achieved for the material with Nb-addition.

Content-Aware Proactive Caching for Backhaul Offloading in Cellular Network

Doan, Khai Nguyen,Van Nguyen, Thang,Quek, Tony Q. S.,Shin, Hyundong IEEE 2018 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.17 No.5

<P>Proactive caching is considered a cost-effective method to address the backhaul bottleneck problem in cellular network. In this paper, we propose a novel popularity predicting–caching procedure that takes raw video data as an input to determine an optimal cache placement policy, which deals with both published and unpublished videos. To anticipate the popularity of unpublished videos of which the statistical information is not available, we apply the content-based approach by extracting and condensing video features into a high-dimensional vector. Subsequently, we form <TEX>$G$</TEX> clusters of features representing the potential video categories (VCs) and map the feature vector into a <TEX>$G$</TEX>-dimensional space, where each element indicates the percentage to which the video contains the features of the corresponding VC. Finally, we train a prediction model to foresee the popularity, where the set of published videos is used as training data. Last, the prediction with expert advice method is used to update the training set, and to gain insight into how the predictor output will deviate from the best expert prediction, we address the concept of expected cumulative loss and derive the analytical expression for its upper bound. Extensive simulation results are shown to gain insight into our proposed system subject to different factors, such as network size, cache capacity, and user’s preference profile. In summary, we show that applying intelligence-based content-aware proactive caching is an efficient approach to significantly improving the operation of cellular networks in the future.</P>

횡적등방성 매질에서 중합전 역시간 구조보정

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.