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Data Warehouse Design Methodologies for Electronic Commerce

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通讯和计算机（中英文版） 2013年第2期10卷 270-275页

作者： dinh thuan nguyen Tung Hoang Faculty of lnformation Systems University of Information Technology VNU-HCM Ho Chi Minh city 70000 Viet Nam Faculty of Information Technology Dong Nai University Dong Nai Province 71000 Viet Nam

Imperfect Channel State Information of AF and DF Energy Harvesting Cooperative Networks

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China Communications 2016年第10期13卷 11-19页

作者： Hoang-Sy nguyen Anh-Hoa BUI dinh-thuan DO Miroslav VOZNAK Wireless Communications Research Group Faculty of Electrical and Electronics Engineering Ton Duc Thang UniversityHo Chi Minh City Vietnam Eastern International University Binh Duong Province Vietnam Faculty of Electrical Engineering and Computer Science Technical University of Ostrava17. Listopadu 15/2172 70833 Ostrava Czech Republic

Wireless information and powered transfer networks(WIPT) has recently been implemented in 5th generation wireless networks. In this paper, we consider half-duplex relaying system in which the energy constrained relay node collects energy via radio frequency(RF) signals from the surrounding resources. Regarding energy harvesting protocol, we propose power time switching-based relaying(PTSR) architecture for both amplify-and-forward(AF) and decode-and-forward(DF). Especially, we reveal the analytical expressions of achievable throughput, ergodic capacity and energy-efficient in case of imperfect channel state information(CSI) for both AF and DF network. Through numerical analysis, we analyse the throughput performance, energy-efficient and ergodic capacity for different parameters, including power splitting ratio and energy harvesting time. Moreover, we also depict the performance comparison between AF and DF network with perfect and imperfect CSI. The results in numerical analysis reveal that the result of AF relaying network is less significant than DF relaying network in the various scenarios.

关键词： amplify-and-forward decode-and-forward energy harvesting throughput channel state information(CSI)

Robust Finite-Time Stability and Stabilization of a Class of Fractional-Order Switched Nonlinear Systems

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Journal of Systems Science & Complexity 2019年第6期32卷 1479-1497页

作者： MAI Viet thuan dinh Cong Huong Department for Management of Science and Technology Development Ton Due Thang UniversityHo Chi Minh CityVietnam Faculty of Mathematics and Statistics Ton Due Thang UniversityHo Chi Minh CityVietnam Department of Mathematics Quynhon UniversityBinhdinhVietnam

This paper deals with the problem of finite-time boundedness and fin计e-time stabilization boundedness of frax?tional-order switched nonlinear systems with exogenous *** constructing a simple Lyapunov-like function and using some properties of Caputo derivative,the authors obtain some new sufficient conditions for the problem via linear matrix inequalities,which can be efficiently solved by using existing convex algorithms.A constructive geometric is used to design switching laws amongst the *** obtained results are more general and useful than some existing works,and cover them as special cases,in which only linear fractional-order systems were *** examples are provided to demonstrate the effectiveness of the proposed results.

关键词： Caputo fractional-order derivative finite-time boundedness fractional-order switched systems linear matrix inequalities

Secure transmission in backhaul NOMA systems:A physical layer security design with untrusted user and eavesdropper

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Digital Communications and Networks 2024年第4期10卷 1001-1013页

作者： Chi-Bao Le dinh-thuan Do Miroslav Voznak Faculty of Electronics Technology Industrial University of Ho Chi Minh City(IUH)Ho Chi Minh City70000Viet Nam School of Engineering University of Mount UnionAllianceOH 44601-3993USA VSB Technical University of Ostrava 17 Listopadu 15/217270833OstravaPorubaCzech Republic

In order to improve the Physical Layer Security(PLS)perspective,this paper aims to empower function of PLS by considering a backhaul Non-Orthogonal Multiple Access(NOMA)system in two practical *** the proposed schemes,the untrusted user intercepts information transmitted to the far user,or the external eavesdropper overhears confidential information sent to the far user in the context of NOMA *** the conventional NOMA systems,this paper emphasizes the actual situations of the existence of actual illegal users and legitimate users,especially the reasonable use of relay selection architecture to improve the confidentiality *** evaluate the security properties of the proposed scheme,a comprehensive analysis of the Security Outage Probability(SOP)performance is first performed,and then the corresponding SOP asymptotic expressions are derived for real scenarios related to eavesdroppers and untrusted *** results are performed to verify the analysis in terms of the secure performance metric.

关键词： Non-orthogonal multiple access(NOMA) Wireless backhaul Secure outage probability Power allocation

New Results on Stability and Stabilization of Delayed Caputo Fractional Order Systems with Convex Polytopic Uncertainties

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Journal of Systems Science & Complexity 2020年第3期33卷 563-583页

作者： dinh Cong Huong MAI Viet thuan DUONG Thi Hong Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh CityVietnam Department of Mathematics and Informatics Thainguyen University of SciencesThainguyenVietnam

In this paper,the problems of robust stability and stabilization,for the first time,are studied for delayed fractional-order linear systems with convex polytopic *** authors derive some sufficient conditions for the problems based on linear matrix inequality technique combined with fractional Razumikhin stability *** the results are obtained in terms of linear matrix inequalities that are numerically *** proposed results are quite general and improve those given in the literature since many factors,such as discrete and distributed delays,convex polytopic uncertainties,global stability and stabilizability,are *** examples and simulation results are given to illustrate the effectiveness of the effectiveness of our results.

关键词： Convex polytopic uncertainty delayed caputo fractional-order systems fractional Razumikhin theorem linear matrix inequality robust stability robust stabilization

Predicted aerodynamic damping of slender single beam structures in across-wind vibrations

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Acta Mechanica Sinica 2020年第5期36卷 990-998,I0001页

作者： Cung Huy nguyen dinh Tung nguyen Department of Civil Engineering Industrial University of Ho Chi Minh CityHo Chi Minh City 700000Vietnam Department of Civil Engineering University of NottinghamNottingham NG72RDUK

The paper presents a generalization of the conventional analytical approach where the quasisteady theory is utilised to evalu-ate the across-wind aerodynamic damping of slender single beam *** generalized theory considers the variation of structural and aerodynamic parameters along the structural height,together with the nature of the vertical wind profile and mode ***-form solutions for typical uniform and tapered tall buildings are given.A numerical application on a prototype tall building shows that the conventional method may be oversimplified,which results in incorrect predictions of the aerodynamic damping.

关键词： Aerodynamic damping Across-wind Slender structure-Galloping Tall building

Analysis and control of vibration of ropes in a high-rise elevator under earthquake excitation

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Earthquake Engineering and Engineering Vibration 2019年第2期18卷 447-460页

作者： thuan Xuan nguyen Nanako Miura Akira Sone Faculty of Mechanical Engineering Kyoto Institute Technology Matsugasaki

In this research, the vibration of elevator ropes, including the main rope and compensation rope are investigated simultaneously in a high-rise elevator system under earthquake excitation. Moreover, the paper presents a new control method to restrain the sway of both ropes. This study considers varying rope lengths during elevator operation which cause other system parameters such as natural frequency, and damping ratio to be time-variant variables. The dynamics of the ropes are analyzed by solving the governing non-stationary, nonlinear equation numerically. In order to mitigate the vibration of ropes in several motion conditions, particularly upwards movement, downward movement, stopped at the lowest position, and stopped at the highest position, an active equipment is installed at the compensation sheave. The stability of the system using the controller is analyzed at four states: without disturbance and static car, without disturbance and mobile car, including disturbance and static car, and including disturbance and mobile car. The efficiency of the controller used for dampening the vibration of elevator ropes is validated by numerical simulation results.

关键词： elevator ropes high-rise elevator vibration controller stability

Mining Time Pattern Association Rules in Temporal Database

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通讯和计算机（中英文版） 2010年第3期7卷 50-56页

作者： nguyen dinh thuan Faculty of Information Technology Nha Trang University Nha Trang 650000 Vtet Nam

New Results on H_(∞) Control for Nonlinear Conformable Fractional Order Systems

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Journal of Systems Science & Complexity 2021年第1期34卷 140-156页

作者： MAI Viet thuan nguyen Thi Huyen Thu nguyen Huu Sau nguyen Thi Thanh Huyen Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of General Science Hanoi University of Natural Resources and EnvironmentHanoiVietnam Faculty of Fundamental Science Hanoi University of IndustryHa NoiVietnam Department of Mathematics and Informatics Thainguyen University of SciencesThainguyenVietnam

This paper deals with H_(∞) control problem for nonlinear conformable fractional order systems. The authors first derive new sufficient condition for exponential stability of nonlinear conformable fractional order systems based on Lyapunov-like function method for conformable fractional order systems and linear matrix inequalities(LMIs) approach. Then, by introducing a new concepts of H_(∞) control problem for nonlinear conformable fractional order systems, the authors study H_(∞) performance analysis and H_(∞) state feedback controller design problems for the considered systems. In terms of LMIs, a sufficient condition is proposed to ensure the nonlinear conformable fractional order systems are not only exponentially stable, but also satisfy H_(∞) performance γ. An explicit expression for state feedback controllers is also designed to make the closed-loop system is exponentially stable with H_∞performance γ. Finally, numerical examples are given to illustrate the validity and effectiveness of the proposed results.

关键词： Conformable fractional-order H_(∞)control problems H_(∞)performance analysis linear matrix inequalities nonlinear systems