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In this paper, a text independent speaker recognition system based on Gaussian mixture models (GMM) was developed with a specific focus on the use of a voice activated detector (VAD) algorithm in the training and testing. At the training level, a modified estimation/maximization (EM) algorithm is used. It is less prone to get trapped around a local maximum and so, it will have more chance to converge...
In this work, the authors introduce a non stationary time-frequency domain decomposition technique for modeling high resolution sea backscatter. In doing this, empirical mode decomposition (EMD) method is applied firstly for denoising the in-phase and the quadrature-phase components. Then, the maximum likelihood estimation (MLE) method is employed in the intensity domain to estimate the shape and...
Vehicular ad hoc network (VANET) is a particular class of mobile ad hoc network (MANET) that utilizes moving cars as nodes to establish wireless communications and exchange information between them without the need of infrastructure. VANET is a promising technology used to provide safety, efficiency, and comfort to the road users. Routing protocol has become one of the most challenging tasks for VANET...
In the recent years, we have observed the development of several connected and mobile devices intended for daily use. This development has come with many risks that might not be perceived by the users. These threats are compromising when an unauthorized entity has access to private big data generated through the user objects in the Internet of Things. In the literature, many solutions have been proposed...
Laboratory of Electrification of Industrials Enterprises (LREEI) of boumerdes and CDTA have developed an in-house Helmholtz coil. It will be used as a source of external magnetic field for studying the Negative Bias Temperature Instability (NBTI) degradation mechanisms that can influence Metal Oxide Semiconductor (MOS) devices. This paper describes the different phases of design and construction of...
The cross-correlation coefficient (CC) was used to estimate the effects of muscular voluntary contraction (MVC) and fibres inclination. The study was based on simulated surface electromyographic (sEMG) signals generated in a cylindrical multi-layer volume conductor (bone, muscle, fat and skin) and detected by longitudinal single differential (LSD), inverse binomial of order two (IB2) and maximum kurtosis...
Polymers are increasingly used in industrial applications due to their low cost of manufacturing, good mechanical properties and thermal stability, many problems related to static electricity can be caused by charges generated on the polymer surfaces. The electrostatic charge generation and charge decay on polytetrafluoroethylene (PTFE) plates was examined using two modes of charging, the tribocharging...
For the proper and stable operation of a microgrid, an accurate estimation of the key parameters under various disturbances is the most important task for the rest of the control blocks. In this paper, a SOGI-FLL scheme aimed for voltage and current parameters estimation in single-phase power system is implemented using high speed ARM microcontroller. The main contribution in this work is the ability...
This paper proposes a numerical method to calculate the induced potential and current in pipelines installed near a horizontal grounding electrode subjected to lightning discharge using the transmission line approach. The effect of this induced potential on the pipeline metal corrosion has been highlighted in term of mass loss for different soil resistivities and separation distances between pipeline...
The use of inductors is essential for high frequency signal processing. They are key components in oscillators, filters, impedance matching circuits and low noise amplifiers. Inductors are also used in power electronics for the realization of DC-DC converters. In this paper, we present a study of the electromagnetic radiation of integrated planar inductors. Two approaches have been used for the study...
The paper presents a system that uses Laboratory Virtual Instrument Engineering Workbench (LabVIEW) software to monitor, and to control the state of an electrical machine depending on user imposed limits. In this system, the real-time variables of an electrical machine are measured and transferred to a controller (PC) through Data Acquisition Card (DAQ). The NI USB 6009 DAQ is selected for this project...
This paper describes an approach to images denoising using relationship between the quaternionic wavelet coefficients for use in remote sensing applications. These images have several spectral components and strong geometric information. The quaternionic wavelet transform gives a very good separation of the coefficients in terms of magnitude and 3-angles phase and generalize better the concept of...
This paper addresses the parameter identification problem of a fractional order system with a known structure. Thus, based on the variational iteration method, its shown that the identification of the parameters can be formulated as an optimization problem. The objective function is the L2-norm of the error between the measured and the model outputs, and the unknown model parameters are the decision...
This paper presents the elaboration of the Au/GaN/GaAs Schottky diodes using the ECR N2 plasma source process at 500°C and its electrical characterization. The substrates of GaAs are n-type doped with Nd= 49×1015cm−3. The thin GaN films are prepared by nitridation of GaAs substrates, using the Electron Cyclotron Resonance Ion Source method at 500°C. The Gold (Au) circular contact is deposed on the...
Accurate detection of cyber-attacks plays a central role in safeguarding computer networks and information systems. This paper addresses the problem of detecting SYN flood attacks, which are the most popular Denial of Service (DoS) attacks. Here, we compare the detection capacity of three commonly monitoring charts namely, a Shewhart chart, a Cumulative Sum (CUSUM) control chart and exponentially...
In this paper, the design of a switched non-PDC controller, for a class of switched nonlinear systems subject to external disturbances is investigated for the purpose of satisfying robust H∞ output-feedback tracking performances. Based on multiple switched non quadratic-like Lyapunov functions, sufficient conditions for the existence of a switched non-PDC controller are formulated in terms of Linear...
Recently, Simultaneous Localization And Mapping (SLAM) problem becomes an active research field in mobile robotics. In addition, Rao-Blackwellized Particle Filter (RBPF) has been introduced as an effective means to solve this problem. This paper describes the implementation of a RBPF-SLAM to estimate the mobile robot pose while building the map of its surrounding indoor environment. In this approach,...
DOA estimation in array processing uses MUSIC (Multiple Signal Classification) algorithm, mainly. It's the most investigated technique and is very attractive because of its simplicity. However, it meets drawbacks and fails when only very few samples are available and the sources are very close or highly correlated. In these conditions, the problem is more intricate and the detection of targets becomes...
In this paper, we address the problem of noise reduction and speech enhancement by adaptive filtering algorithms using the forward blind source separation structure (FBSS), which is often combined with adaptive algorithms to efficiently cancel the acoustic noise at the output. In this paper, we propose to combine the FBSS with the Simplified Fast Transversal Filter (SFTF) algorithm, where the adaptation...
In this paper, a combining Electroencephalographic (EEG) and Electro-oculographic (EOG) approach has been developed in order to allow the control of the displacement of a wheelchair by disable peoples. NeuroSky MindeWave headset and wet superficial electrodes have been used for the measurement of EEG and EOG signals respectively. These signals have been processed using Wavelet Transform (WT) and Principal...
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