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31 results on '"Luu, Gia -Thien"'

1. After-Fatigue Condition: A Novel Analysis Based on Surface EMG Signals

Author

Nguyen, Van Hieu, Luu, Gia Thien, Van Luong, Thien, Trang, Mai Xuan, Ravier, Philippe, and Buttelli, Olivier

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

This study introduces a novel muscle activation analysis based on surface electromyography (sEMG) signals to assess the muscle's after-fatigue condition. Previous studies have mainly focused on the before-fatigue and fatigue conditions. However, a comprehensive analysis of the after-fatigue condition has been overlooked. The proposed method analyzes muscle fatigue indicators at various maximal voluntary contraction (MVC) levels to compare the before-fatigue, fatigue, and after-fatigue conditions using amplitude-based, spectral-based, and muscle fiber conduction velocity (CV) parameters. In addition, the contraction time of each MVC level is also analyzed with the same indicators. The results show that in the after-fatigue condition, the muscle activation changes significantly in the ways such as higher CV, power spectral density shifting to the right, and longer contraction time until exhaustion compared to the before-fatigue and fatigue conditions. The results can provide a comprehensive and objective evaluation of muscle fatigue and recovery, which can be helpful in clinical diagnosis, rehabilitation, and sports performance.

Published
2023

12. An Effective Time Varying Delay Estimator Applied to Surface Electromyographic Signals

Author

Luu, Gia Thien, Boualem, Abdelbassit, Ravier, Philippe, Buttelli, Olivier, Akan, Ozgur, Series Editor, Bellavista, Paolo, Series Editor, Cao, Jiannong, Series Editor, Coulson, Geoffrey, Series Editor, Dressler, Falko, Series Editor, Ferrari, Domenico, Series Editor, Gerla, Mario, Series Editor, Kobayashi, Hisashi, Series Editor, Palazzo, Sergio, Series Editor, Sahni, Sartaj, Series Editor, Shen, Xuemin (Sherman), Series Editor, Stan, Mircea, Series Editor, Xiaohua, Jia, Series Editor, Zomaya, Albert Y., Series Editor, Cong Vinh, Phan, editor, Ha Huy Cuong, Nguyen, editor, and Vassev, Emil, editor

Published
2018
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13. Time Varying Delay Estimators for Measuring Muscle Fiber Conduction Veloity: Effects of Non-stationarity of the Data

Author

Luu, Gia-Thien, Tran, Trung Duy, Tan, Hanh, Ngo, Thanh Tung, Ravier, Philippe, Buttelli, Olivier, Magjarevic, Ratko, Editor-in-chief, Ładyżyński, Piotr, Series editor, Ibrahim, Fatimah, Series editor, Lacković, Igor, Series editor, Rock, Emilio Sacristan, Series editor, Vo Van, Toi, editor, Nguyen Le, Thanh An, editor, and Nguyen Duc, Thang, editor

Published
2018
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15. Comparison Between Parametric and Non-Parametric Approaches for Time-Varying Delay Estimation with Application to Electromyography Signals

Author

Luu, Gia Thien, Duy, Tran Trung, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Coulson, Geoffrey, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin Sherman, Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert Y., Series editor, Vinh, Phan Cong, editor, and Barolli, Leonard, editor

Published
2016
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16. Analysis of Multiantenna UAV-Aided NOMA Relay Systems for Short-Packet Communications between Multiuser Pairs

Author

Hoang, Tran Manh, Dung, Le The, Nguyen, Ba Cao, Tran, Xuan Nam, and Luu, Gia Thien

Abstract

This article analyzes the performance of a multiantenna unmanned aerial vehicle (UAV)-aided nonorthogonal multiple access (NOMA) relay system to support the finite-blocklength communications between multiple user pairs. To achieve better performance, at the multiantenna UAV, the maximal-ratio combining and maximal-ratio transmission are deployed, and the greedy algorithm is utilized to select the optimal user pair. Based on the approximate Gaussian–Chebyshev quadrature and the incomplete Gamma function, we successfully derive the exact and asymptotic closed-form expression for the average block error rate (BLER), throughput, and goodput of the investigated multiantenna UAV-aided NOMA relay system, taking the impacts of the line-of-sight probability, communication environments, and UAV velocity into consideration. Moreover, we also study other metrics, such as reliability, age of information (AoI), and average packet arrival rate. Simulation results verify the accuracy of the analytical framework. Numerical results indicate that the investigated system meets the requirements of ultrareliable and low-latency communications. Notably, the results showed that the multiantenna UAV-aided NOMA relay system has a reliability higher than 99.99% and an AoI of less than 1 s. Moreover, the optimal UAV altitude, blocklength, and number of transmission bits can be found to maximize the throughput and goodput and minimize the BLER and AoI of the system.

Published
2024
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17. Multiple RISs for Enhancing the Secrecy Performance of NOMA Systems Over Realistic Nakagami-<inline-formula><tex-math notation="LaTeX">$m$</tex-math></inline-formula> Fading Channels

Author

Van, Quyet-Nguyen, Nguyen, Ba Cao, Dung, Le The, Hoang, Tran Manh, Nguyen, Huu Minh, Van Vinh, Nguyen, and Luu, Gia Thien

Abstract

In this article, we utilize multiple reconfigurable intelligent surfaces (RISs) to improve the secrecy performance of non-orthogonal multiple access (NOMA) systems. In particular, multi-RIS is exploited to aid two legitimate NOMA users under the existence of colluding eavesdroppers. We successfully derive the mathematical expressions of the secrecy outage probabilities (SOPs) and ergodic secrecy capacities (ESCs) of the proposed systems under realistic Nakagami-$m$ channels recommended for the fifth and beyond generation (5 G & B5G) wireless networks. Numerical results confirm the enormous benefits of the proposed systems compared to the classical NOMA systems with multiple eavesdroppers and without RISs. More specifically, compared to the classical NOMA systems, the SOPs of the proposed systems are considerably lower, while the ESCs are dramatically higher. In addition, the transmit power to obtain the lowest SOPs of the proposed systems is lower than that to get the lowest SOPs of the classical NOMA systems. On the other hand, the effects of many crucial parameters, such as the carrier frequencies of Wi-Fi systems, the fading order, and the distances between transmitter-receiver, are thoroughly examined to obtain the behaviors of the proposed systems. Finally, Monte-Carlo simulations are provided to validate the derived expressions.

Published
2024
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20. Combination of the gamma emission tomography and the virtual point-detector methods for calculating radioactive waste drum by non-destructive assays

Author

Luu Gia Thien, Tran Minh Sang, Huynh Dinh Chuong, Vo Xuan Huyen, and Tran Thien Thanh

Subjects
Optics, Materials science, business.industry, Point detector, Non destructive, Gamma ray, Radioactive waste, General Medicine, Drum, Tomography, business
Abstract

In this study, the gamma emission tomography and the virtual point-detector method were combined to calculate the efficiency of the radionuclide inside the radioactive waste drum. Therefore, the radioactivity of the radionuclide inside the waste drum has been calculated. The results showed that the source location was determined by the gamma emission tomography for good results with the experimental value. The discrepancies between measured and true activity were smaller than 13% for the sand matrix.

Published
2020

21. Physical security with power beacon assisted in half-duplex relaying networks over Rayleigh fading channel: performance analysis

Author

Tran Thanh Trang, Phu Tran Tin, Luu Gia Thien, and Duy-Hung Ha

Subjects
Correctness, Monte carlo simulation, Computer science, Energy harvesting, Half-duplex, Node (networking), Monte Carlo method, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Data_CODINGANDINFORMATIONTHEORY, Topology, law.invention, Power (physics), Intercept probability, Relaying network, Relay, law, Computer Science::Networking and Internet Architecture, Electrical and Electronic Engineering, Energy (signal processing), Rayleigh fading, Communication channel, Computer Science::Cryptography and Security, Computer Science::Information Theory
Abstract

In this research, we proposed and investigated physical security with power beacon assisted in half-duplex relaying networks over a Rayleigh fading channel. In this model, the source (S) node communicates with the destination (D) node via the helping of the intermediate relay (R) node. The D and R nodes harvest energy from the power beacon (PB) node in the presence of a passive eavesdropper (E) node. Then we derived the integral form of the system outage probability (OP) and closed form of the intercept probability (IP). The correctness of the analytical of the OP and IP is verified by the Monte Carlo simulation. The influence of the main system parameters on the OP and IP also is investigated. The research results indicated that the analytical results are the same as the simulation ones.

Published
2020

22. Muscle Fiber Conduction Velocity During Cycling Exercise

Author

Luu Gia Thien, Ravier Philippe, and Buttelli Olivier

Subjects
medicine.diagnostic_test, Control theory, medicine, Data dynamics, Estimator, Electromyography, Isometric exercise, Cycling, Muscle fiber conduction velocity, Mathematics
Abstract

Muscle Fiber Conduction Velocity(MFCV) can be calculated from the time delay between the surface EMG signals recorded by electrodes aligned with the fiber direction. In Isometric and dynamic contraction, the property of the EMG signal is stationary and non-stationary respectively. The aim of this study is to validate the time delay estimators recently developed by our group. The proposed methods should be adapted the non-stationary of the data. These methods were analyzed by Monte-Carlo simulation to determinate their performance are sufficient in the practical condition. We test these estimators with the real data dynamics contractions in order to take into account the nonstationarity of the data. The results of this study also present the law of variation of MFCV during the cyclist circles.

Published
2019

23. Performance evaluation of multi-hop cooperative transmission protocol with hardware noises and presence of eavesdropper

Author

Phu Tran Tin, Miroslav Voznak, Tran Trung Duy, Tran Thong Nhat, and Luu Gia Thien

Subjects
Engineering, business.industry, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Monte Carlo method, 020206 networking & telecommunications, Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, Transmitter power output, MCT protocol, Electronic mail, law.invention, Hop (networking), Relay, law, Computer Science::Networking and Internet Architecture, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Transmission protocol, business, Computer hardware, Computer Science::Cryptography and Security, Computer Science::Information Theory, Rayleigh fading
Abstract

In this paper, we propose a simple multi-hop cooperative transmission protocol (MCT) to decrease outage probability for multi-hop networks under impact of hardware impairments and presence of an eavesdropper. In the proposed method, the source and intermediate relays adjust their transmit power so that the eavesdropper cannot overhear the transmitted data. We derive exact closed-form expressions of outage probability (OP) and the average number of time slots (TS) used to relay the data from the source to the destination for the MCT protocol over Rayleigh fading channel. Monte Carlo simulations are performed to verify the theoretical derivations. Results show that the proposed protocol outperforms multi-hop direct transmission one (MDT), in terms of the average OP and TS.

Published
2017

24. Physical security with power beacon assisted in half-duplex relaying networks over Rayleigh fading channel: performance analysis.

Author

Phu Tran Tin, Duy-Hung Ha, Luu Gia Thien, and Tran Thanh Trang

Subjects
RAYLEIGH fading channels, MONTE Carlo method, CYBER physical systems, ENERGY harvesting, BEACONS
Abstract

In this research, we proposed and investigated physical security with power beacon assisted in half-duplex relaying networks over a Rayleigh fading channel. In this model, the source (S) node communicates with the destination (D) node via the helping of the intermediate relay (R) node. The D and R nodes harvest energy from the power beacon (PB) node in the presence of a passive eavesdropper (E) node. Then we derived the integral form of the system outage probability (OP) and closed form of the intercept probability (IP). The correctness of the analytical of the OP and IP is verified by the Monte Carlo simulation. The influence of the main system parameters on the OP and IP also is investigated. The research results indicated that the analytical results are the same as the simulation ones. [ABSTRACT FROM AUTHOR]

Published
2020
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26. Down-link cooperative transmission with transmit antenna selection, hardware noises and non-independent co-channel interferences

Author

Luu Gia Thien, Tan Hanh, Nguyen Quoc Dien, Tran Trung Duy, and Vo Nguyen Quoc Bao

Subjects
business.industry, Computer science, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Data_CODINGANDINFORMATIONTHEORY, Interference (wave propagation), Cooperative diversity, law.invention, Base station, Transmission (telecommunications), Relay, law, Computer Science::Networking and Internet Architecture, Antenna (radio), business, Computer hardware, Computer Science::Information Theory, Communication channel, Rayleigh fading
Abstract

In this paper, we propose and evaluate performances of a down-link cooperative transmission scheme with joint impact of imperfect hardware and non-independent co-channel interference. In the proposed scheme, a base station (BS) uses transmit antenna selection (TAS) technique to transmit its data to its intended user (US). Moreover, one of potential relay stations (RS) in the network is selected to help the BS relay the data to the US which uses selection combining (SC) technique to combine the received data. We derive exact and asymptotic expressions of outage probability over Rayleigh fading channel. The derivations are then verified by computer simulations.

Published
2015

28. Energy Harvesting-based Spectrum Access with Incremental Cooperation, Relay Selection and Hardware Noises.

Author

NGUYEN, Tan N., DUY, Tran Trung, LUU, Gia-Thien, TRAN, Phuong T., and VOZNAK, Miroslav

Subjects
ENERGY harvesting, COGNITIVE radio, RADIO transmitter-receivers, WIRELESS communications, SPECTRUM allocation
Abstract

In this paper, we propose an energy harvesting (EH)-based spectrum access model in cognitive radio (CR) network. In the proposed scheme, one of available secondary transmitters (STs) helps a primary transmitter (PT) forward primary signals to a primary receiver (PR). Via the cooperation, the selected ST finds opportunities to access licensed bands to transmit secondary signals to its intended secondary receiver (SR). Secondary users are assumed to be mobile, hence, optimization of energy consumption for these users is interested. The EH STs have to harvest energy from the PT’s radio-frequency (RF) signals to serve the PTPR communication as well as to transmit their signals. The proposed scheme employs incremental relaying technique in which the PR only requires the assistance from the STs when the transmission between PT and PR is not successful. Moreover, we also investigate impact o f hardware impairments on performance of the primary and secondary networks. For performance evaluation, we derive exact and lower-bound expressions o f outage probability (OP) over Rayleigh fading channel. Monte-Carlo simulations are performed to verify the theoretical results. The results present that the outage performance of both networks can be enhanced by increasing the number o f the ST-SR pairs. In addition, the outage performance of both primary and secondary networks is severely degraded with the increasing of hardware impairment level. It is also shown that fraction of time used for EH and positions of the secondary users significantly impact on the system performance. [ABSTRACT FROM AUTHOR]

Published
2017
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