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Ho Chi Minh City, Vietnam

Ho Chi Minh City International University is an English-speaking university located in Ho Chi Minh City, Vietnam. It is a member university of Vietnam National University, Ho Chi Minh City. It was established in 2003 with the aim to become one of the leading research universities in Vietnam.The teaching is conducted mainly in English. Thus, in addition to entrance exams, students also have to take an English test or have a TOEFL, TOEIC, IELTS or equivalent English certificate as required by HCMIU and its cooperative universities. Majors offered by HCMIU are: business, biotechnology, electrical engineering, information technology, biomedical engineering, civil engineering, industrial systems engineering and applied mathematics. Wikipedia.

Chang C.-C.,Feng Chia University | Kieu T.D.,Ho Chi Minh City International University
Information Sciences | Year: 2010

Obtaining good visual quality and high hiding capacity with reversible data hiding systems is a technically challenging problem. In this paper, we propose a simple reversible data hiding scheme that uses a complementary hiding strategy. The proposed method embeds one secret bit horizontally and vertically into one cover pixel of a grayscale cover image by decreasing odd-valued pixels and increasing even-valued pixels by one. Experimental results show that the hiding capacity measured by bit per pixel (bpp) of the proposed scheme is at least 1.21 bpp with a PSNR (peak signal-to-noise ratio) value greater than 52 dB for all standard test images. Especially in the case of four-layer embedding, the PSNR value of the proposed method is still greater than 51 dB at a hiding capacity of about 5 bpp for all standard test images. In addition, the proposed method is quite simple because it primarily uses additions and subtractions. These results indicate that the proposed scheme is superior to many existing reversible data hiding schemes introduced in the literature. © 2010 Elsevier Inc. All rights reserved. Source

LeFloch P.G.,University Pierre and Marie Curie | Thanh M.D.,Ho Chi Minh City International University
Journal of Computational Physics | Year: 2011

We investigate the Riemann problem for the shallow water equations with variable and (possibly) discontinuous topography and provide a complete description of the properties of its solutions: existence; uniqueness in the non-resonant regime; multiple solutions in the resonant regime. This analysis leads us to a numerical algorithm that provides one with a Riemann solver. Next, we introduce a Godunov-type scheme based on this Riemann solver, which is well-balanced and of quasi-conservative form. Finally, we present numerical experiments which demonstrate the convergence of the proposed scheme even in the resonance regime, except in the limiting situation when Riemann data precisely belong to the resonance hypersurface. © 2011 Elsevier Inc. Source

Nguyen H.,Institute for Computational Science and Technology | Le L.,Ho Chi Minh City International University
European Biophysics Journal | Year: 2015

We have used steered molecular dynamics simulation to investigate the molecular interactions between four M2 inhibitors (amantadine, rimantadine, and two other amantadine derivatives) and the M2 protein channels of influenza A virus H5N1, including the wild type (WT) and three previously identified drug-resistant variants (G34A, S31N, and V27A). The binding free energies between these four inhibitors and the M2 channel of the WT and the three mutants were also determined by use of the molecular mechanics–Poisson–Boltzmann surface area method. Our study provides important insight into binding affinity, including detailed energy components and interactions at the molecular level of four potential inhibitors with the M2 channel of drug-resistant strains; this may assist further experimental study and strategies for rational design of new inhibitors. © 2015, European Biophysical Societies' Association. Source

Le L.,Ho Chi Minh City International University | Leluk J.,University of Zielona Gora
PLoS ONE | Year: 2011

M2 channel, an influenza virus transmembrane protein, serves as an important target for antiviral drug design. There are still discordances concerning the role of some residues involved in proton transfer as well as the mechanism of inhibition by commercial drugs. The viral M2 proteins show high conservativity; about 3/4 of the positions are occupied by one residue in over 95%. Nine M2 proteins from the H3N2 strain and possibly two proteins from H2N2 strains make a phylogenic cluster closely related to 2RLF. The variability range is limited to 4 residues/position with one exception. The 2RLF protein stands out by the presence of 2 serines at the positions 19 and 50, which are in most other M2 proteins occupied by cysteines. The study of correlated mutations shows that there are several positions with significant mutational correlation that have not been described so far as functionally important. That there are 5 more residues potentially involved in the M2 mechanism of action. The original software used in this work (Consensus Constructor, SSSSg, Corm, Talana) is freely accessible as stand-alone offline applications upon request to the authors. The other software used in this work is freely available online for noncommercial purposes at public services on bioinformatics such as ExPASy or NCBI. The study on mutational variability, evolutionary relationship, and correlated mutation presented in this paper is a potential way to explain more completely the role of significant factors in proton channel action and to clarify the inhibition mechanism by specific drugs. © 2011 Le, Leluk. Source

Van Hung P.,Ho Chi Minh City International University
Critical Reviews in Food Science and Nutrition | Year: 2016

Phenolic compounds play an important role in health benefits because of their highly antioxidant capacity. In this review, total phenolic contents (TPCs), phenolic acid profile and antioxidant capacity of the extracted from wheat, corn, rice, barley, sorghum, rye, oat, and millet, which have been recently reported, are summarized. The review shows clearly that cereals contain a number of phytochemicals including phenolics, flavonoids, anthocyanins, etc. The phytochemicals of cereals significantly exhibit antioxidant activity as measured by trolox equivalent antioxidant capacity (TEAC), 2,2-diphenyl-1-picrylhydrazyl radical scavenging, reducing power, oxygen radical absorbance capacity (ORAC), inhibition of oxidation of human low-density lipoprotein (LDL) cholesterol and DNA, Rancimat, inhibition of photochemilumenescence (PCL), and iron(II) chelation activity. Thus, the consumption of whole grains is considered to have significantly health benefits in prevention from chronic diseases such as cardiovascular disease, diabetes, and cancer because of the contribution of phenolic compounds existed. In addition, the extracts from cereal brans are considered to be used as a source of natural antioxidants. © 2016, Copyright © Taylor and Francis Group, LLC. Source

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