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Cost consideration of the development of electronic devices is one of prime importance. One simple approach to lower the cost of production of photovoltaic and detectors is by using low cost materials such as amorphous silicon and germanium. These two semiconductors have different optoelectronic properties, such as energy gap, photoconductivity and absorption coefficient. The use of an alloy from...
Volterra models are very useful for representing nonlinear systems with vanishing memory. The main drawback is their parametric complexity. In this paper, we present a new class of Volterra models, called Volterra-Parafac models, with a reduced parametric complexity, by using a parallel factor (PARAFAC) decomposition of Volterra kernels of order (p > 2) viewed as tensors. This paper is concerned...
Terrestrial Digital Video Broadcasting (DVB-T) is considered as one of the main two popular broadcasting standards, which facilitates the transmission of digital television in handheld receivers. In this work, a comparison will be held to enhance the mobile communications performance. This work aims to reduces the effect of a major problem found in the Orthogonal Frequency Division Multiplexing (OFDM)...
An existing method for tuning a generalized predictive control (GPC) law using desired closed-loop transfer functions is applied to preview systems. In the context of preview systems, it is supposed that future values of the reference signal are available a number of time steps ahead. This information can be used to reduce the error between the reference signal and the measured output by adding an...
The paper aims to optimize the geometry of an interdigital electrodes (IDE) used as a capacitive sensor for the quality evaluation of oils. The dielectric constant of an edible oil depends on its quality and composition, it is usually in the range between 2.9 and 3.1 and slightly changes if the composition or the quality changes. Since the change is very small it's very important to use a measurement...
This paper presents a design and comparative study of backstepping and adaptive nonlinear control for variable wind speed energy conversion system based on a permanent magnets synchronous generator. The adaptive Backstepping control is applied in order to extract the maximum energy from wind by the high tracking performance of speed control. The main contribution of this control is the robustness...
In this paper, we propose a Dual-Leap Motion Controllers (DLMC) based Arabic Sign Language recognition system. More particularly, we propose to use both front and side controllers to cater for the challenges of finger occlusions and missing data. For feature extraction, we select an optimum set of geometric features extracted from both controllers, while for classification, we used both a Bayesian...
The major contribution of frames theory, in particular wavelet frames, is to ensure a perfect and stable signals reconstruction. This paper focuses on the speech reconstruction stability, in distortion sense, of the tight framelet packet transform which is new time-frequency decomposition derived from wavelet frame theory. A comparison with classical wavelet transform has been conducted. The experimental...
Fractional-Order Proportional-Integral-Derivative (FOPID) controllers presents a natural extension to PID controllers, which have been used profusely in industrial control systems, and are of great practical preference. This paper presents an implementation of FOPID control in an industrial distributed control system (DCS) that is used here for level process control. The setup is composed of ABB DCS...
This paper presents a Cartesian adaptive control based on a robust Sliding Mode and Time Delay Estimation (CSMTDE) for controlling a redundant exoskeleton robot called ETS-MARSE subject to uncertain nonlinear dynamics and external forces. The robustness and accuracy are achieved by selecting a sliding Cartesian surface and a sliding joint surface. The combination between them is done by the nonlinear...
Recently, the use of object proposals has been much introduced in the field of salient object segmentation methods. Object proposal methods provide a limited set of proposals per image which can successively be analyzed on their saliency. In this context, we regard saliency map computation as a regression problem and we used object proposals (selective search) to compute the saliency map. Our method...
This paper present a query-by-example word spotting in handwritten Arabic documents, based on Harris detector and Scale Invariant Feature Transform (SIFT), without using any text word or line segmentation approach, because any errors affect to the subsequent word representations. First, the interest points are automatically extracted from the images using Harris detector, then, we use SIFT descriptor...
This paper presents an empirical study that aims to determine the frequency band best suited for ECG heartbeat detection operation for portable monitoring electronic device. This study was accomplished using the Continuous Wavelet Transform technique and in particular the Mexican-hat wavelet. This study was performed to minimize the effect of motion artifacts type of noise as it is prevalent and difficult...
Since sensor nodes are energy constrained as they have limited power resources, they turn off their energy earlier. So, it will be so hard and so expensive to change or recharge their batteries from one time to another especially for a large scale networks. Therefore, prolonging their lifetime is a key issue that should be highly considered. As a solution for this problem is to manage intelligently...
Wireless sensor network (WSN) considered as one of the important technology in our days. Low-cost, low-power and multifunction based on these characteristics WSN become more and more apply in many areas. However, one of the major challenges in WSN is the security. Indeed, the usual method of security cannot be applied in WSN because the technological limit of the different components. In this context,...
This paper exposes some aspects of the Tunisian power system transient stability, drawn from the operational experience of the network. Different types and criteria of stability are considered: angular stability is studied by determining the fault critical clearing time after short circuit faults. Frequency stability is assessed function of allocated primary reserves and under-frequency load shedding...
In this paper, we analyze the conception, the realization, and the optimization of a photovoltaic system (PV) adapted by a converter DC / DC of Buck type and an analogical MPPT command provided with a detection circuit of the dysfunction and convergence of the system (CDCS). The CDCS circuit allows assuring an optimal functioning of the PV panels independently in the variations of the conditions meteorological...
In order to provide a testing for Wind Energy Conversion Systems (WECS) control strategies, a Wind Turbine Emulator (WTE) was designed and realized. The experimental implementation of the WTE for WECS consists of permanent magnet DC motor controlled by Pulse-Width Modulated (PWM). A DC motor is used to generate speed and torque required by the aero generator (PMSG) for producing electrical power....
In this work, we propose a comparative study to reduce, and control the radiated electromagnetic interference (EMI) as crosstalk in planar power devices, such as a PCB board of boost converter DC-DC. The PCB board contains two coupled microstrip: power, and control lines that induce a strong crosstalk. A comparative study between several methods against crosstalk is proposed. The serpentine guard...
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