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Lottery Mindsets and the Cross Sectional Returns in the Vietnam Stock Market
Viet Anh Hoang(Viet Anh Hoang Viet Anh Hoang),Ba Thanh Truong(Ba Thanh Truong Ba Thanh Truong),Duong Viet Anh(Duong Viet Anh Duong Viet Anh),Hoang Van Hai(Hoang Van Hai Hoang Van Hai) People & Global Business Association 2024 Global Business and Finance Review Vol.29 No.4
Purpose: In this study, we evaluate the relationship between lottery-type stocks and future return in the Vietnam stock market from July 2010 to June 2023. Design/methodology/approach: We employ portfolio-level analysis and firm-level cross-sectional regressions fol-lowing Bali et al. (2011). Findings: We find that the minimum daily return (MINRET) is negative and statistically significant in the cross-sec-tional pricing of stocks. The minimum daily return during the previous month and anticipated stock returns are negatively and significantly correlated, according to portfolio-level analyses and firm-level cross-sectional regressions. However, the maximum daily return (MAXRET) effect is not priced in the Vietnam stock market. These findings hold up under controls for liquidity, skewness, momentum, short-term reversals, size, and book-to-market. Research limitations/implications: This study provides an understanding of the lottery phenomenon in the empiri-cal dimension, especially in the emerging stock market. Originality/value: Importantly, our empirical findings that the MINRET, not MAXRET, effect is strongly exhibited as a lottery-type stock's behavior in the Vietnam market.
The Effectiveness of Financial Sources for Climate Change in Vietnam
Thi Nhung NGUYEN(Thi Nhung NGUYEN ),Minh Hoa NGUYEN(Minh Hoa NGUYEN ),Thi Phuong Anh VU(Thi Phuong Anh VU ),Thi Hoang Anh DO(Thi Hoang Anh DO ) 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.1
This research aims to give information about the current situation of five financial sources for climate change in Vietnam, including (i) the State budget used by ministries; (ii) the State budget used by provinces; (iii) Bilateral funds; (iv) Multilateral funds; and (v) Private funds, and then classify them in line with the effectiveness. The working paper’s secondary data on spending on CC-related activities, collected from reports of six ministries and 29 provinces, show that the State budget has been crucial in subsidizing CC-related activities in Vietnam. Moreover, domestic investment has accounted for a major part of the total expenditure of ministries and provinces for climate change. In addition, by using primary data collected from surveys sent to twelve experts from 5 groups, such as researchers, practical experts, managers of private funding organizations (such as banks and enterprises), managers of international funding organizations and beneficiaries, and then analyzing the data through the AHP method, the study shows that all climate finance sources in Vietnam are still not very effective. However, private sector funds are considered the most effective financial source for responding to climate change.
Focusing ultrasonic waves in a 2-D covered channel above the periodic array of Helmholtz resonators
Anh Hoang Vu,황영인,김학준,송성진 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
This paper presents the numerical simulation and experiments on focusing low-frequency ultrasonic waves in a 2-D covered channel above acoustic metamaterials composed of the periodic array of Helmholtz resonators, in which the refractive index can be in a negative value. The 2-D channel above the acoustic metamaterials is covered by a plate to limit the area affected by the negative refractive index metamaterials. Ultrasonic waves propagated in the 2-D covered channel are found to be highly dependent on input frequency and the designed Helmholtz resonator structure, where its negative refractive index causes the focusing phenomenon in this channel. From the numerical simulation and experiments, an amplitude focus spot is observed in the peak-to-peak of the time domain signal and frequency response at 125 kHz by mapping a pressure field in the 2-D covered channel. Different focal points with several input frequencies are also identified. Our research demonstrates the possibility of applying the designed lens based on acoustic metamaterials to improve the focusing effect in ultrasonic testing.
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.
Korean Family Name Distribution in the Past
Hoang Anh Tuan Kiet,김범준,정하웅,백승기 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5
We empirically study the genealogical trees of ten families for about five centuries in Korea. Although each family tree contains only the paternal part, the family names of women married to the family have been recorded, which allows us to estimate roughly the family name distributions for the past five hundred years. Revealed is the fact that the unique Korean family name distribution, characterized by a logarithmic form of the cumulative distribution and an exponentially decaying rank-size plot often called the Zipf plot, has remained unchanged for a long time. We discuss the implications of our results within a recently suggested theoretical model and compare them with observations in other countries in which power-law forms are abundantly found.
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.