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This paper presents two control techniques to cater issues of stabilization due to network delays in the network control systems (NCS). First technique is focused on the modification a simple PI controller by adding a middle ware to adjust PI parameters in accordance with the delays. Next, a novel technique Automatic Disturbance Rejection Control (ADRC) is discussed to cater the issues due to delays...
We are interested in this paper on approaches of the hybrid systems, the constraints, continuous and discrete systems, these approaches are the Mixed Logical Dynamical (MLD) and the Piecewise Affine Systems (PWA). In this work, we suggest to utilize the Model Predictive Control (MPC) then the approach to reconfiguration control and reconfiguration with Hammerstein method. The idea of this work is...
Censoring is a phenomenon usually encountered in the analysis of lifetime system. It became commonly used in the last few decades because of its flexibility in removing failed units from tests. In this paper, the Inverse Flexible Weibull Distribution (IFWD) proposed in [1] is studied using maximum likelihood technics based on three different algorithms: Newton Raphson (NR), Levenberg Marquardt (LM)...
In this paper, we present a unsed idea to control an electropneumatic system based on the Model-free control. First, we described the mathematical model of the electropneumatic system which presents a complexity and several nonlinearities. Then, the model-free control is presented, which yield a controller based on signal derivation. It is characterized by its simplicity and implementation capability...
In this work, a bifurcation analysis of the predator-prey BB-model is presented by considering a weak Allee Effect on the prey. To bring out the difference between the proposed dynamical behavior and that of the BB-model with a strong Allee Effect, a local and global bifurcation analysis is presented. Finally, phase portraits and bifurcation diagrams are shown for the two cases studies to highlight...
Our work focuses mainly on the optimal control issues for switched nonlinear systems. In fact, we are interested, especially, in studying some cases in which we obtain a pre-specified string of active subsystems. Besides, we suggest Genetic Algorithm approach in order to obtain the optimal switching instants. We intend mainly to reduce the cost function according to the previously-mentioned instants.
This article proposes elaborating an optimal stabilization of large scale interconnected processes, whereas the nonlinear interconnection functions between subsystems are assumed to be norm bounded. Sufficient conditions derived from the asymptotic stability analysis and the optimal performances study of the designed control strategy are formulated within an optimization problem. Such a problem is...
This paper deal with the local stabilization of a magnetic levitation system. The system in view is highly nonlinear, inherently unstable and contains significant uncertainty of the coil characteristics caused by the temperature variation. We propose a nonlinear polynomial model for the magnetic levitation system. This model is then used to design a nonlinear local stabilizing control law which maximizes...
Dynamic inversion is a category of control design techniques that employ feedback linearization. In recent years; this technique has been applied to different types of nonlinear systems. This paper presents its usefulness with nonlinear electromechanical systems. Dynamic inversion method is employed to ensure robustness and stability of the system. Moreover, the inputs can be found and achieve high-precision...
Recently, the low cost EEG acquisition systems such as the Emotiv Epoc give new tools to develop Brain-Computer interface systems for everyday use outside the laboratory. However, the low sampling rate and the low number of channels remain possible sources of failure. The Canonical Correlation Analysis and the Multivariate Synchronization Index (MSI) methods are applied in a SSVEP-based BCI in order...
A good comprehensive study of the electromagnetic properties of biological layers is important since we cannot discuss an implantable antenna design without investigating the interaction of electromagnetic radiation with the tissue. The human body is not an ideal medium for the transmission of radio waves which can be considered as a barrier degrading the performance of the transmission system that...
In this communication, we propose a stream cipher system based on nonlinear filter generator for speech data encryption. The cipher is simple and highly efficient. It is implemented to encrypt and decrypt speeches data. Several experimental tests are done for proving the system performance. The results show that the proposed scheme is secure certain attacks.
In this study a novel architecture of Ultra Wide Band generator is explained. This architecture is the major important component in the generator Ultra Wide band communications systems. The new generator is consists of oscillator, multiplier and triangular pulse generator. This new study of generator is consists by multiply the triangular pulse signal envelope with a sinusoidal signal in the aim to...
This manuscript presents a watermarking method based on Discrete Wavelet Transform (DWT) and Singular Value Decomposition (SVD) with the Advanced Encryption Standard (AES) algorithm encryption applied on medical image. The proposed schema will be developed to increase the protection and robustness along with security. In our algorithm, after decomposing the original image into four sub-bands in the...
Functional Electrical Stimulation (FES) appears as a way of extremely promising research today to solve numerous pathology connected to the deficiencies of the nervous system. It is usually used for the rehabilitation of people with neurological disorders. Generally, skeletal muscles are activated by using Constant Frequency Trains (CFTs) with a fixed amplitude and inter-pulse duration. In addition,...
Several antigens have been produced and/or secreted from the mycobacterium bovis. The agent of bovine tuberculosis (TB) is used to detect this disease in cattle through the serological ELISA test (a, b, c, d and e). In this work, we propose a novel approach to improve the diagnosis bovine tuberculosis. In order to select the antigens with top priority, the proposed methodology is based on a comparison...
The systems of interconnection play a major role in the performance expected by System on chip (SoC). With the evolution of technology, conventional shared-bus based interconnections are no longer the ideal solution for the future SoC. Therefore Network on chip (NoC) is emerging as a perfect solution to enhance the communication structures for future SoC. Compared with the conventional interconnection...
The applications that use the principle of Schottky Diode Detector, SDD, are varied and touch several domains. Radar system is one of these applications where SSD appears especially interesting and gives a strong renewal of gain. In this work, we give a general description on radar system, where the Schottky diode represents the detecting component; we describe also the characteristics current-voltage...
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