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Ho Chi Minh City, Vietnam

Tran T.-D.,University of Ulsan | Tran T.-D.,Hanoi University of Industry | Kwon Y.-K.,University of Ulsan
Journal of the Royal Society Interface | Year: 2013

Many biological networks tend to have a high modularity structural property and the dynamic characteristic of high robustness against perturbations. However, the relationship between modularity and robustness is not well understood. To investigate this relationship, we examined real signalling networks and conducted simulations usingarandom Boolean network model. As a result, we first observed that the network robustness is negatively correlated with the network modularity. In particular, this negative correlation becomes more apparent as the network density becomes sparser. Even more interesting is that, the negative relationship between the network robustness and the network modularity occurs mainly because nodes in the same module with the perturbed node tend to be more sensitive to the perturbation than those in other modules. This result implies that dynamically similar nodes tend to be located in the same module of a network. To support this, we show that a pair of genes associated with the same disease or a pair of functionally similar genes is likely to belong to the same module in a human signalling network. © 2013 The Author(s). Source

Tran T.,Hunan University | Tran T.,Industrial University of Ho Chi Minh City | Hou S.,Hunan University | Han X.,Hunan University | And 3 more authors.
Thin-Walled Structures | Year: 2014

The triangular tubes with multi-cell were first studied on the aspects of theoretical prediction and crashworthiness optimization design under the impact loading. The tubes? profiles were divided into 2-, 3-, T-shapes, 4-, and 6-panel angle elements. The Simplified Super Folding Element theory was utilized to estimate the energy dissipation of angle elements. Based on the estimation, theoretical expressions of the mean crushing force were developed for three types of tubes under dynamic loading. When taking the inertia effects into account, the dynamic enhancement coefficient was also considered. In the process of multiobjective crashworthiness optimization, Deb and Gupta method was utilized to find out the knee points from the Pareto solutions space. Finally, the theoretical prediction showed an excellent coincidence with the numerical optimal results, and also validated the efficiency of the crashworthiness optimization design method based on surrogate models. © 2014 Published by Elsevier Ltd. All rights reserved. Source

Tran T.,Hunan University | Tran T.,Industrial University of Ho Chi Minh City | Hou S.,Hunan University | Han X.,Hunan University | And 2 more authors.
International Journal of Mechanical Sciences | Year: 2014

Multi-cell square tubes under dynamic oblique impact loading were studied in our work. The theoretical predictions of mean crushing force, mean horizontal force, and mean bending moment were proposed by dividing the profile into basic angle elements based on a Simplified Super Folding Element (SSFE) theory. The formulas of an oblique impacting coefficient (λ) with a load angle of 15° were proposed based on the geometric parameters, the inertia effect and the oblique loading angle by taking the effect of oblique loading and dynamic crushing into account for aluminum alloy tubes. A new method was proposed to find out a "knee point" from Pareto set with maximizing the reflex angle. The optimal configurations of multi-cell tubes were analyzed under axial and more than one oblique impact loadings. The results showed that the FE numerical results agreed well with the theoretical predictions. © 2014 Elsevier Ltd. All rights reserved. Source

Hoa P.T.,Hanoi University of Industry | Dinh T.X.,Ritsumeikan University | Dau V.T.,Sumitomo Chemical
IEEE Sensors Journal | Year: 2015

In this paper, we report the design study of a fluidic device that produces four microjet flows comprising two perpendicular pairs of flow and the application of these jets for an angular rate sensor. The jets were created in a closed fluidic network without a check valve and they can freely deflect in a confined sensing chamber. The formation of the continuous flow in a confined space has been confirmed by experiment. This allows the study to a triple-axis angular rate sensor whose working principle relies on the deflection of a jet in a rotating frame. In this paper, the formation of the jets is considered such that the jets have an axisymmetric property, which is key to overcoming the apparent decoupling and cross sensitivity. The triple-axis angular rate sensor can be designed with only four thermal sensing elements. The transient flow simulation under an applied angular velocity provides a design with small size and minimum number of hotwires, which is beneficial for single-chip development and also maintains compatibility with bulk microfabrication technology. While the sensing performances of the three axes are in the same order of magnitude, the cross sensitivity is two orders smaller than that in the published results. In addition to the inertial sensing application, this paper can be adapted to help researchers quickly develop a prototype or to integrate an inertial sensing component in their own microfluidic, microbio, or lab-on-a-chip systems. © 2001-2012 IEEE. Source

Bich D.H.,Vietnam National University, Hanoi | Ninh D.G.,Hanoi University of Science and Technology | Kien B.H.,Hanoi University of Industry | Hui D.,University of New Orleans
Composites Part B: Engineering | Year: 2016

In this study, the nonlinear vibration and dynamic buckling of eccentrically stiffened functionally graded toroidal shell segments surrounded by an elastic medium in thermal environment are presented. The governing equations of motion of eccentrically stiffened functionally graded toroidal shell segments are derived based on the classical shell theory with the geometrical nonlinear in von Karman-Donnell sense and the smeared stiffeners technique. Furthermore, the dynamical characteristics of shells as natural frequencies, nonlinear frequency-amplitude relation, nonlinear dynamic responses and the nonlinear dynamic critical buckling loads evaluated by Budiansky-Roth criterion are considered. The effects of characteristics of functionally graded materials, geometrical ratios, elastic foundation, pre-loaded axial compression and temperature on the dynamical behavior of shells are investigated. © 2016 Elsevier Ltd. All rights reserved. Source

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