The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Recent advances in sensor and wireless radio frequency (RF) technologies offer vast opportunities for development and application of sensor systems for agriculture. It is the concept of precision agriculture, where Wireless Sensor Networks (WSN) is playing an important part in the handling and managing of water resources for irrigation, in understanding the changes in the crops to assess the optimum...
The aim of the paper is to assess the feasibility of impedance measurements for meat aging detection. The carried investigations are dedicated to the aging of the meat of beef. An investigation was carried out for the detection of the age of meat using 2 cases of storage in the fridge, unpacked meat, exposed in the air of the fridge (Up) and vacuum-packed meat, conserved in closed box (Vp). The measurements...
This paper is devoted to the stability analysis of uncertain nonlinear dynamic systems. The generalized polynomial chaos formalism is proposed to deal with this challenging problem treated in most cases by using the prohibitive Monte Carlo based techniques. Two equivalent methods combining the non-intrusive generalized polynomial chaos with the indirect Lyapunov method are presented. Both methods...
This paper presents a Digital Signal Processor (DSP) based real time digital emulation model for single phase controlled DC/AC distributed generation system. A DC/AC converter with LC filter fed resistive load are implemented on the DSP. The digital emulation model also includes a multi-loop control to achieve the real-time emulation of the complete distributed generation system. All models have been...
Thanks to the fast growth of the technological sector and more precisely of the biomedical electronics, a total improvement of the living conditions of the human being and an appreciable increase of its longevity were carried out. This development allows creating implantable electronic devices for recording neural signals. This paper lies within the scope of acquisition and wireless transmission of...
The multimodel and multicontrol approaches are two powerful techniques which are often useful in literature, to the analyse, the modeling and the control of complex systems. Indeed, the operating range of the process is partitioned into a set of operating regions. For each operation region a local model or/and controller is applied. The effective control applied to the process is a fusion of all these...
This paper describes an effective method to detect inhomogeneities in magneto-conductive objects using very cheap but still rather sensitive sensors based on the giant magneto resistive effect (GMR) [6]. These sensors measure the magnetic field leakage near the surface of a magneto-conductive object. For a pilot survey, some test specimens were prepared with artificial inhomogeneities in a ferromagnetic...
This paper presents a control strategy using Sliding Mode Control (SMC) and Repetitive Control (RC) for linear multi-input discrete-time systems to reject periodic and multi-periodic disturbances. A new reaching law is used to steer the system trajectories into the sliding surface and then keep them on it without chattering. The repetitive control is used to reject periodic and multi-periodic signals...
In an effort to utilize the solar energy effectively through power electronics converters (conditioners), a great deal of research is being carried out to meet the increasing demand for load. This paper proposes an experimental photovoltaic (PV) power conditioning system with line connection. The conditioner consists of a flying capacitors multi-cell inverter fed by a dc-dc boost converter. The boost...
This paper presents a model of the underground shielded cable by using voltage and current electrical measurements available in voltage source. The cable modeling is based on the distributed parameters theory which takes into account both core and sheath. This model is applied to the real case of 150 kV cable posed in trefoil configuration, connecting substations of TYNA, TAPAROURA and SIDIMANSOUR,...
This paper proposes a new method for the simulation of the fractional systems. It deals with the approximation methods of the fractional derivative. It compare the approximation based on Grünwald with Caputo approximation. The efficiency of each approximation methods in terms of execution time and quadratic error is evaluated for different differential orders and stepsize. The best approximation...
This paper presents a new ellipsoidal set-membership method for the identification of linear fractional orders systems. It use the Optimal Bounding Ellipsoid (OBE) algorithm. When the probability distribution of the disturbances is unknown but bounded and when the differentiation orders are known, the proposed method can estimate all the feasible parameters. A numerical example shows the effectiveness...
There are many areas where objects with very complex and sometimes interdependent features are to be classified; similarities and dissimilarities are to be evaluated. This makes a complex decision model difficult to construct effectively. This paper presents a Hierarchical Fuzzy Signatures (HFS) approach for improving the effectiveness and efficiency of quality-management system (QMS). The goal is...
Position control of processes that involve the submarine immersion can present a real problem for the actuators because of the high level of non linearity of the system and because of the external disturbances. Such problem is often treated by a sliding mode control; however, this approach implies a disadvantage which is the chattering phenomenon. This paper deals with the basic concepts, mathematics,...
The intrusion based on Bužek-Hillery universal quantum copying machine (UQCM) is investigated. A major problem to the eavesdropper Eve is how to choose the intrusion parameters required by the copying machine in order to take out the maximum of information on the transmitted qubits. In the present paper, only the isotropic cloning is considered. The degree of intrusion is evaluated by means of the...
In this paper, we propose a developed unsharp masking process for contrast image enhancement. The main idea here is to enhance the dark and bright area in the same way which matches the response of human visual system well. Then in order to reduce the noise effect, a mean weighted high pass filter is used for edge extraction. The proposed method gives satisfactory results for wide range of low contrast...
This article discusses the parameter estimation for dynamic system by a Bayesian approach associated with Markov Chain Monte Carlo methods (MCMC). The MCMC methods are powerful for approximating complex integrals, simulating joint distributions, and the estimation of marginal posterior distributions, or posterior means. The Metropolis-Hastings algorithm has been widely used in Bayesian inference to...
Assuring continuity operating of induction machine drives is crucial in the most of applications. Thanks to the number of their output voltages, and the extra degrees of freedom they offer, multilevel inverters have been adopted in many applications. In this paper, a new fault tolerant SVM strategy for induction machine drives based on a 3 level NPC inverter is proposed. It insures a continuous operation...
In this paper we analyze the performance of advanced OFDM packet scheduling techniques based on 3GPP UTRAN Long Term Evolution (LTE) framework for high velocity scenarios. Based on our previous investigations in system performance analysis, we demonstrate that packet scheduler being part of the whole radio resource management (RRM) process has a major impact on it. On the other hand high user velocities...
The paper deals with a dc bus voltage sensor fault tolerant control (FTC) for a single phase PWM rectifier used in electric traction application. FTC increases the availability and reliability of the system, since it allows fault detection and isolation (FDI) of faulty component and then control reconfiguration. Estimator and Luenberger observer are developed in order to generate residual for fast...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.