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Nowadays, automatic assessment of programming assignments has become an important topic in academic research. In fact, the increasing number of enrolled students in programming courses created the need of a system providing immediate feedback to the learners and saving teachers from manually managing all the students' solutions. This paper presents an attempt to conduct programming exercises assessment...
The capacity of wireless sensor network (WSN) can be severely limited due to interference constraints. The integration of smart antenna system (SAS) in wireless sensor networks is a challenging and very attractive technical solution to improve the system capacity, the quality of service, and the power control. Smart antenna system has the advantage over traditional omnidirectional antennas system...
Energy efficiency and quality of service are foremost concerns in Wireless Sensor Networks (WSNs). Among the methods used to achieve these requirements there is virtual multiple input multiple output (MIMO) technique, where sensor nodes cooperate with each other to form an antenna array. These multiple antennas can be used to improve the network performance (lifetime, data rate, bit error rate …)...
This paper presents a machine vision system for automatic recognition of plant leaves diseases from images. The proposed system is based on serial combination technique of two SVM classifiers. The first classifier uses the color to classify the images; it considers, at this phase, that the diseases with similar or nearest color belonging to the same class. Then, the second classifier is used to differentiate...
This paper presents a new dynamic equivalent model for distribution power networks using MATLAB SIMULINK. It is based on the representation of the medium power transmission line by π circuits. The method gives complete information about the dynamic behavior of the system. The distribution network is analyzed in a wide range frequency domain and the oscillations can be observed. The dynamical behavior...
Our national security, economic prosperity, and national well-being are dependent upon a set of highly interdependent critical infrastructures (CI). The need to share information in a secure way between collaborating CIs is becoming increasingly important, in order to benefit from shared applications and resources. Coalitions between autonomous domains are often formed to enable access permissions...
In this article, a new approach to explore the candidate car license plate scene is presented. First, the image is decomposed by using a Haar wavelet to get the HL sub-image with vertical edges. Next, a black top-hat algorithm is applied to minimize the effects of interfering large continuous features other than the license plate. Then, the horizontal and vertical projections of the HL sub-image provide...
Hyperspectral images belong to high-dimensional data having a lot of redundancy information when they are directly used to classification. One of the most problems in hyperspectral image classification is the Hughes phenomenon caused by the irrelevant spectral bands and the high correlation between the adjacent bands. The problematic is how to find the relevant bands to classify the pixels of hyperspectral...
Wireless communication is the need of the hour, so there is a huge thirst for improvement of the means of communication. Motivated by the looming crisis of radio frequency (RF) spectrum, light fidelity (Li-Fi) which is a technology attached to the visible light communications (VLC) offers many key advantages and effective solutions to the problems posed in the last decade. Through this technology,...
This paper presents a single phase full bridge bidirectional boost rectifier with power factor correction. A novel control based on Singular Perturbation is used in this circuit to assert that inductor currents are fast states and capacitor voltages are slow states. The goals of this paper are the analysis and the design methodology of cascaded proportional-integral controller in feedback loop by...
Virtual enterprise integration and interoperability between its different information systems are the first systemic paradigms to achieve a successful collaborative product development. In such a context, the information flow has a centric place. Therefore, our aim in this paper is to propose a new ontology-based framework, exploiting the expressiveness of ontologies to ensure collaboration and semantic...
We introduce a liquid refractive index sensor based on a one-dimensional photonic crystal formed by alternating layers of Barium fluoride (BaF2) and Gallium arsenide (GaAs) with an empty layer in the middle. This lamellar cavity (defect layer) will be filled with polluted water. We demonstrate the device through the selective infiltration of a single layer with liquid along a photonic crystal. The...
Microgrid will constitute the heart of the next generation of power systems. They are expected to incorporate more distributed generation (DG) mainly coming from renewable energy (RE). They are characterized by their ability to manage and control electricity by using the advance of information technology. In parallel, development of multi agent systems (MAS) and their tested proprieties increase researchers...
In this work a simple model describing semiconductors in both nondegenerate and degenerate cases is presented. This one-dimensional model which can serve for circuit simulation purposes is based on the solution of drift-diffusion equations. It uses the Fermi-Dirac distribution to describe carriers behavior and employs a generalized Scharfetter-Gummel discretization scheme to insure stability and convergence...
Adaptive network based fuzzy inference system (ANFIS) is an intelligent neuro-fuzzy technique which has proven to be able to model and control of various nonlinear and uncertain systems. The research presented in this paper aims to develop a new original fuzzy model of single-phase HV power supply of microwave magnetron. The design of this system is composed of leakage flux transformer with magnetic...
This paper describes an investigation of the direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drive. It is proven by equations that the increase of electromagnetic torque is proportional to the increase of the angle between the stator flux and the rotor flux linkage. The use of permanent magnet synchronous motor combined with direct torque control offers many opportunities...
This paper suggests a comparison between two cases of new control strategy in order to track the maximum power point of a PV water pumping system. The first case represents the photovoltaic panel without series and shunt resistances. The second case the photovoltaic panel system with a series and shunt resistances. The solar panel is connected to the DC motor pumping by using a DC-DC Boost converter...
A numerical investigation to simulate the fluid flow and heat transfer in a two-dimensional horizontal channel containing a multi heated physical rectangular bodies is conducted using hybrid thermal lattice Boltzmann method (HTLBM). A combination between the Multiple Relaxation Time-Lattice Boltzmann Equation (MRT-LBE) D2Q9 for fluid velocity and Finite Difference Method (FDM) for temperature is used...
This paper presents a new approach for open circuit fault diagnosis using the park's vector technique in a three phase voltage source inverter. The technique has proved its effectiveness through simulation results, the standard deviation of the currents in the d-q frame was used to extract the symptoms failure, and the analysis of the currents to localize the faulty switch, within one current period...
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