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Ho Chi Minh City, Vietnam

Ho Chi Minh City University of Technology – a member of Vietnam National University, Ho Chi Minh City - still referred to by many as Phu Tho, is the flagship university in technology teaching and research activities in Vietnam. The university plays the active role in the fields of talents cultivation and providing manpower with strong technical skills to the Southern areas of Vietnam.HCMUT is a center of technology - industry and management training. The HCMUT training activities have made a remarkable contribution to satisfy the increasing demands for man power of the industrialization and modernization in Vietnam generally and Southern Vietnam areas particularly. Moreover, HCMUT is also the science research and technology transfer center which plays the significant role in providing information, applications of advanced technologies and technologies transfers to concerning industrial zones in the Southern areas of Vietnam.Up to May 2005, HCMUT has 11 faculties, 10 research and development centers, 4 training centers, 10 functioning offices and one limited company. During the past 30 years since Vietnam's unification, 45,000 engineers and Bachelors have graduated from HCMUT. Since 1994, HCMUT have trained 20,000 Bachelors of Science, 1,503 Masters and 25 Doctors, many of whom are either keeping management roles and or leading experts in state-owned or foreign-investment enterprises of different industries in Ho Chi Minh City and other southern provinces. Wikipedia.

Quang P.T.A.,Ho Chi Minh City University of Technology | Kim D.-S.,Kumoh National Institute of Technology
IEEE Transactions on Industrial Informatics | Year: 2014

This paper proposes a routing algorithm that enhances throughput and decreases end-to-end delay in industrial cognitive radio sensor networks (ICRSNs) based on ISA100.11a. In ICRSNs, the throughput is downgraded by interference from primary networks. The proposed routing algorithm is targeted at large-scale networks where data are forwarded through different clusters on their way to the sink. By estimating the maximum throughput for each path, the data can be forwarded through the most optimal path. Simulation results show that our scheme can enhance throughput and decrease end-to-end delay. © 2005-2012 IEEE. Source

Nguyen T.D.,Ho Chi Minh City University of Technology | Lee H.-H.,University of Ulsan
IEEE Transactions on Industrial Informatics | Year: 2014

A new space vector modulation (SVM) process for use in an indirect matrix converter (IMC) has been proposed in this paper to reduce the common-mode voltage (CMV) in a high voltage transfer ratio. The principles of selecting suitable active vectors and then properly arranging the switching sequence in the inverter stage of the IMC are described. The IMC with the new SVM method significantly reduces the peak-to-peak voltage of the CMV without any extra hardware. The new SVM method has some other advantages such as a lower total harmonic distortion of line-to-line output voltage and a reduced switching loss at the inverter stage through a minimum number of switching commutations as compared to the conventional reduced CMV-SVM method. The proposed modulation can be easily implemented in software without any additional hardware modifications. Both simulation and experimental results are shown to demonstrate that the new SVM method can generate good performance of the input/output waveforms and provide CMV reduction. © 2005-2012 IEEE. Source

Anh H.P.H.,Ho Chi Minh City University of Technology
Expert Systems with Applications | Year: 2010

This paper presents a detailed study to investigate the possibility of applying the online tuning gain scheduling MIMO neural dynamic DNN-PID control architecture to a nonlinear 2-axes pneumatic artificial muscle (PAM) robot arm so as to improve its joint angle position output performance. The proposed controller was implemented as a subsystem to control the real-time 2-axes PAM robot-arm system so as to control precisely the joint angle position of the 2-axes PAM robot arm when subjected to system internal interactions and load variations. The results of the experiment have demonstrated the feasibility and benefits of the novel proposed control approach in comparison with the traditional PID control strategy. The proposed gain scheduling neural MIMO DNN-PID control scheme forced both joint angle outputs of 2-axes PAM robot arm to track those of the reference simultaneously under changes of the load and system coupled internal interactions. The performance of this novel proposed controller was found to be outperforming in comparison with conventional PID. These results can be applied to control other highly nonlinear systems. © 2010 Elsevier Ltd. All rights reserved. Source

Nguyen H.,Ho Chi Minh City University of Technology
Journal of Sound and Vibration | Year: 2013

It is known that, for multi-degree-of-freedom systems under time-dependent excitation, the combination of an internal resonance with an external resonance will give rise to simultaneous resonances, and these resonances are characterized by the fact that the system in question can resonate simultaneously in more than one normal mode while only one resonant mode is directly excited by the excitation. This work deals with the problem of the occurrence of simultaneous resonances in a parametrically-excited and simply-supported rectangular plate. The analysis is based on the dynamic analog of von Karman's large-deflection theory, and the governing equations are satisfied using the orthogonality properties of the assumed functions. The nonlinear temporal response of the damped system is determined by the first-order generalized asymptotic method. The solution for simply supported plates indicates the possibility of principal parametric resonances and simultaneous resonances. Simultaneous resonances involving two modes of vibration are presented in this paper, and it is shown for the first time that only one possibility out of two cases can really occur. This phenomenon is verified by experimental results and observations. © 2013 Elsevier Ltd. Source

Hoang V.V.,Ho Chi Minh City University of Technology
Physica B: Condensed Matter | Year: 2010

Structure and stability of glass of monatomic Lennard-Jones (LJ) system at nanoscale compared with those of the bulk counterparts have been studied using the classical molecular dynamics (MD) method. Models have been obtained by cooling from the melts. Structure of the systems was analyzed via radial distribution function (RDF), interatomic distances, the Honeycutt-Andersen analysis and coordination number distributions. Surface and core structures of LJ nanoparticles have been analyzed in details. Density dependence and cooling rate effects on structure of the systems have been found and discussed. In addition, size dependence of structure and properties of nanoparticles has been analyzed in detail. Indeed, we found glass formation in monatomic LJ systems; however, their stability is not high. Evolution of structure and thermodynamics of the systems upon cooling from the melts was found. We also discussed annealing-induced crystallization of LJ glass. © 2010 Elsevier B.V. All rights reserved. Source

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