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Anh Thi Le,Manh Ha Hoang,Minh Hoa Nguyen,T. Anh Thu Do,Minh Tan Man 한국진공학회(ASCT) 2020 Applied Science and Convergence Technology Vol.29 No.5
We present an analytical method to model the influence of gold nanoparticle (Au NP) concentration on the energy transfer between Cy3 orange beads (OBs) and Au NPs. The OBs and Au NPs act as donor (D) and acceptor (A), respectively. In the D–A system, the energy transfer efficiency strongly depends on the spectral overlap and separation R between donor and acceptor. Theoretical calculations for a range of R values between 10 and 100 Å produce three parameters that each characterize one of three different resonant energy transfer mechanisms: fluorescence resonant energy transfer, surface resonant energy transfer and Coulomb energy transfer. The values of these parameters provide estimates of the degree of quenching or enhancement of the fluorescence of D–A complexes as a function of concentration. A comparison between experimental and theoretical data confirms the validity of the model.
Anh Hoang LE,Taegi KIM 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.8
This paper investigates the effect of institutional quality on FDI inflows by using FDI outflows from Asian countries from 2009 to 2017. We used the FDI data from five major Asian economies, which are South Korea, China, Japan, Singapore, and Hong Kong. The gravity model was used to examine the effect of institutional quality on FDI flows. The regression model considers several independent variables, and we select the most appropriate variables by using the Bayesian Model Averaging (BMA) estimator. We have shown that foreign direct investment from Asian countries depends on the size of home and the partner countries, geographical distance, trade interaction between two countries, economic freedom, labor supply, tariff rate, and capacity of the government. The results of different estimation techniques emphasize that multinational enterprises prefer to invest in those countries which have a higher income, which shows the evidence for Lucas’s paradox. The results also show that economic freedom and control of corruption have a positive impact on FDI inwards. The regression results show that better institutional quality in host countries encourages more FDIs from Asian economies. It suggests that the state should control corruption and create a free economic environment to attract FDIs.
Chemical Vapor Synthesis and Characterization of Manganese Oxides
Le, Hoang Anh,Chin, Sungmin,Park, Eunseuk,Linh, Le Thuy,Bae, Gwi‐,Nam,Jurng, Jongsoo WILEY‐VCH Verlag 2011 CHEMICAL VAPOR DEPOSITION -WEINHEIM- Vol.17 No.7
<P><B>Abstract</B></P><P>Manganese oxide nanoparticles are synthesized by a chemical vapor process using manganese(0) carbonyl as the precursor. The synthesis temperature of the materials is varied from 500 to 1500 °C at 200 °C intervals. These nanomaterials are characterized by X‐ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer‐Emmett‐Teller (BET) surface area, and X‐ray photoelectron spectroscopy (XPS). XRD shows that the manganese oxide nanoparticles synthesized at 500, 700 – 1100, 1300, and 1500 °C are mainly MnO<SUB>2</SUB>, Mn<SUB>2</SUB>O<SUB>3</SUB>, Mn<SUB>2</SUB>O<SUB>3</SUB>/Mn<SUB>3</SUB>O<SUB>4</SUB>, and Mn<SUB>3</SUB>O<SUB>4</SUB>, respectively. The TEM and BET results also confirm that the particle size is on the nanometer scale with a large specific surface area (SSA) of 81 – 215 m<SUP>2</SUP> g<SUP>−1</SUP>. XPS indicates the catalysts to have manganese oxidation states of (2+), (3+), or (4+) depending on the synthesis temperature.</P>
A deep sparse autoencoder method for automatic EOG artifact removal
Hoang-Anh The Nguyen,Anh Tuan Do,Thanh Ha Le,The Duy Bui 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
In this paper, a novel hybrid method that combines wavelet transform and deep sparse autoencoder for ocular artifact removal is presented. This deep wavelet sparse autoencoder (DWSAE) is capable of suppressing EOG artifacts effectively while preserving the nature of background EEG signals. DWSAE is automatic in either training (unsupervised learning) or correcting phase that makes it a good solution to be integrated into real-time Brain computer interfaces. DWSAE is compared with two other methods that are Second order blind identification (SOBI) and Wavelet neural network (WNN). The experimental results on a public visual attention task dataset show that it address limitations posed by SOBI and WNN effectively.
Hoang Anh Nguyen,Thi Nam Pham,Le Thanh Nguyen Huynh,Tran Ha Trang Nguyen,Viet Hai Le,Nguyen Thai Hoang,Thi Thom Nguyen,Thi Thu Trang Nguyen,Dai Lam Tran,Thi Mai Thanh Dinh The Korean Electrochemical Society 2024 Journal of electrochemical science and technology Vol.15 No.2
Due to its high theoretical capacity, Silicon (Si) has shown great potential as an anode material for lithium-ion batteries (LIBs). However, the large volume change of Si during cycling leads to poor cycling stability and low Coulombic efficiency. In this study, we synthesized Si/Carbon C45:Graphene composites using a ball-milling method with a fixed Si content (20%) and investigated the influence of the C45/Gr ratio on the electrochemical performance of the composites. The results showed that carbon C45 networks can provide good conductivity, but tend to break at Si locations, resulting in poor conductivity. However, the addition of graphene helps to reconnect the broken C45 networks, improving the conductivity of the composite. Moreover, the C45 can also act as a protective coating around Si particles, reducing the volume expansion of Si during charging/discharging cycles. The Si/C45:Gr (70:10 wt%) composite exhibits improved electrochemical performance with high capacity (~1660 mAh g<sup>-1</sup> at 0.1 C) and cycling stability (~1370 mAh g<sup>-1</sup> after 100 cycles). This work highlights the effective role of carbon C45 and graphene in Si/C composites for enhancing the performance of Si-based anode materials for LIBs.
Mott Transition in the Asymmetric Hubbard Model at Half-filling: Equation of Motion Approach
Anh-Tuan Hoang,Thi-Thu-Trang Tran,Duc-Anh Le 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.2
We investigate the Mott metal-insulator transition in the asymmetric Hubbard model, which may describe the ground states of fermionic atoms trapped in optical lattices. We use the dynamical mean-field theory and the equation of motion approach to calculate the density of states at the Fermi level and the double occupation for various values of the on-site interaction U and the hopping asymmetry r. The critical interaction is also obtained as a function of the hopping asymmetry. Our results are in good agreement with the ones obtained by using the dynamical mean field theory with the exact diagonalization and the quantum Monte Carlo techniques.
Le Hoang Anh(레황안),Soo-Chang Lee(이수창),Gwang-Hyun Yu(유광현),Jin-Young Kim(김진영) 한국디지털콘텐츠학회 2024 한국디지털콘텐츠학회논문지 Vol.25 No.1
ChronoPatternNet revolutionizes power forecasting using a unique 2D convolutional approach for advanced temporal pattern recognition. The chronocycle hyperparameter, optimized via fast Fourier transform, structures Cyclical Time Frames, enhancing both extraction and prediction accuracy. Integration of layer normalization and residual learning mitigates the vanishing gradient problem, ensuring stability. With superior efficiency, ChronoPatternNet achieves a reduction in the number of parameters ranging from 58.8% to 61.9% compared to existing models. This positions ChronoPatternNet as a significant advancement in real-time energy management.
The Effects of Economic Freedom on Firm Investment in Vietnam
LE, Anh Hoang,KIM, Taegi Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.3
This paper investigates how economic freedom affected firm investment in Vietnam. In the globalization decade, economic freedom has been an important policy to support economic development in Vietnam. Improvements in economic freedom, such as capital freedom and domestic credit freedom, allow firms to access external finance more easily, so that the firm's investment depends less on internal cash flow. In a developing country, on the drawbacks, many small and medium firms likely have more challenges if the government would not give any subsidies. The higher level of freedom may exacerbate the financing constraints of less competitive firms. We analyze unique firm-level data from 2006 to 2016, which includes listed firms on two major stock exchanges and unlisted firms in the Unlisted Public Company Market. The article also considers how economic freedom affects small firms and large firms differently. Our results show that capital freedom and domestic credit freedom played an important role in investments for Vietnamese firms. However, we cannot find evidence that overall economic freedom relaxed the financial constraints on firms. Additionally, we suggest that small firms likely gain more advantage in access to external finance than do larger firms when the government removes restrictions from capital movement and the domestic credit market.