Ton Duc Thang University

Ho Chi Minh City, Vietnam

Ton Duc Thang University

Ho Chi Minh City, Vietnam
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Patent
Ton Duc Thang University | Date: 2015-08-17

A smart home system is disclosed which comprises a central camera system; a voice IP unit; a user identification system; a behavioral pattern data server; a plurality of sensors electrically coupled to operate each device based on the distance analysis with respect to each user; a central processing unit; a habit learning unit configured to analyze, interpret, and form a habitual usage profile for each user; and a central switching unit configured to operate each device following instructions from the central processing unit and the habit learning unit.


Patent
Ton Duc Thang University | Date: 2015-08-17

A method and a computer software program for operating a smart home system including a sensor electrically coupled to each device, a central processing unit (CPU), and a data storage is disclosed that includes the steps of receiving attributes of a user, calculating a distance between the user and a device, performing a distance analysis, forming a habitual usage profile using a sequence pattern data mining algorithm, and sending a habitual usage command in accordance with said habitual usage profile.


Tran T.,Ton Duc Thang University
Thin-Walled Structures | Year: 2017

This paper investigates the lateral crushing behavior of multi-cell thin-walled triangular tubes using experiments. More crushing modes are found in the lateral compression experiments of the multi-cell triangular tubes. The average crushing force, Pa, is governed by the plastic hinge lines. Based on experiments and the improved simplified super folding element (ISSFE) theory, theoretical models are proposed to predict average crushing force (Pa) in each stage. The formula of Pa is a function of flow stress of material, wall thickness, and length of tube. The results show that the theoretical solutions agree well with the experiment data. © 2017 Elsevier Ltd


Nguyen D.,Ton Duc Thang University
International Journal of Advanced Manufacturing Technology | Year: 2017

Elastic deformation machining method is a simple machining method in manufacturing aspheric surfaces process. In this method, the top surface of workpieces will deform and be in contact with the mold surface once vacuum is applied, while the bottom of workpiece is polished to flatness with the vacuum pressure is maintained stability. The machining process is finished when the thickness of workpiece is polished to size as required. When the vacuum is turned off and the workpiece is released from the mold, the bottom surface of the workpiece will be shaped into the aspheric surface as the top surface returns to its original flat surface form due to material elasticity. During machining, the form accuracy of aspheric surface is dependent on the value of vacuum pressure and contact between workpiece and mold surface. Therefore, the study of behavior of the glass in contact with the mold surface is necessary to determine the suitable mold surface. In this paper, the simulation results of the glass in contact with the mold in the different pressure values have been carried out. Based on the simulation and experiment results, the appropriate pressure values and mold surface are established for machining process by elastic deformation machining method. In order to improve the precision of form surface produced in elastic deformation machining, the mold profile is modified by selecting the finite element analysis results of workpiece in the case of vacuum pressure P = −95 kPa and the conic constant K = −3. © 2017 Springer-Verlag London Ltd.


Tran T.,Ton Duc Thang University
Thin-Walled Structures | Year: 2017

Recently, requirements for data regarding crushing force have motivated researchers to investigate the crushing behaviour of tubes. The present work aims to study the crushing of multi-cell triangular tubes made of aluminium alloy AA6060T4 using theoretical and numerical analyses under multiple impact loadings. By dividing the profile into several basic angular elements and using the Improved Simplified Super Folding Element (ISSFE) theory, theoretical equations of the mean crushing/horizontal force, and the mean bending moment are proposed to calculate the mean crushing strength of these sections. It is found that the number of “cells” in a tube's structure and to a certain extent the load angle have a considerable effect on the Specific Energy Absorption (SEA), and Mean Crushing Force (MCF). Numerical analyses were conducted, and the simulation results show a strong correlation between the crush response and the cross-section of the tubes. The analytical predictions for the MCF are compared with the FE results. © 2017 Elsevier Ltd


Nguyen-Truong H.T.,Ton Duc Thang University
Journal of Physics Condensed Matter | Year: 2017

Knowledge of electron inelastic mean free paths (IMFPs) is important for electron spectroscopy and microscopy studies. Here, we determine the IMFPs at energies below 100 eV for 10 elemental solids (V, Fe, Ni, Mo, Pd, Ag, Ta, W, Pt, and Au) within the dielectric formalism, using the energy-loss function calculated in the adiabatic local-density approximation of time-dependent density-functional theory. The resulting IMFPs at a few eV above the Fermi energy are comparable to those from ab initio calculations in the GW approximation of many-body theory. The present approach provides an alternative to evaluate hot-electron inelastic lifetimes. © 2017 IOP Publishing Ltd.


Nguyen-Truong H.T.,Ton Duc Thang University
Journal of Physical Chemistry C | Year: 2015

We derive an analytical formula for the electron inelastic mean free path (IMFP) from its definition within the dielectric formalism. The parameters in this formula are determined solely by the optical energy-loss function of the material of interest. This formula is valid for electrons of energy larger than 500 eV, including relativistic electrons. © 2015 American Chemical Society.


Nguyen V.P.,Ton Duc Thang University | Nguyen-Xuan H.,Ton Duc Thang University
Composite Structures | Year: 2013

Finite element analysis of the delamination process in delaminated composites is addressed using high order Bézier elements relied on the Bernstein polynomials which are commonly used in Computer Aided Design. Laminae of a composite laminate are modeled with two dimensional Bézier elements. Zero-thickness cohesive elements, which are inserted along the interface in between the laminae to model the interface cracking, employ the high order univariate Bernstein basis functions. Quadratic, cubic and quartic Bernstein basis functions are examined. An open source pre-processing code is presented to generate Bézier meshes and interface elements. Implementation of a simple yet highly efficient arc-length solver which is able to trace equilibrium paths having multiple snap-backs is given. Numerical examples are presented for the analyses of benchmark composite delamination problems which include the double cantilever beam, the end notch flexure and the mixed mode bending tests. Additionally multiple delamination analysis of a composite specimen is also presented. Additionally multiple delamination analysis of a composite specimen is also investigated. For all given examples, the highly efficient performance of the proposed formulation is found. © 2013 Elsevier Ltd.


Patent
Ton Duc Thang University | Date: 2015-05-24

A method and apparatus for lifting a patient is disclosed to include a base with wheels on the back side and casters on the front side; a pair of extendable legs extended or withdrawn from the frontal side of the base to maintain balance when lifting a patient; vertical masts connected to a three-prong hanger; three durable cables used with a sling assembly to lift the patient; a foldable chair provides temporary rest for the patient on the patient lift; and a control panel having a micro-controller for remotely controlling the patient lift.


Patent
Ton Duc Thang University | Date: 2014-12-26

A method and apparatus for lifting a patient is disclosed to include a base with wheels on the back side and casters on the front side; a pair of extendable legs extended or withdrawn from the frontal side of the base to maintain balance when lifting a patient; vertical masts connected to a three-prong hanger; three durable cables used with a sling assembly to lift the patient; a foldable chair provides temporary rest for the patient on the patient lift; and a control panel having a micro-controller for remotely controlling the patient lift.

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