Proceedings of the 2014 6th International Conference on Electronics, Computers and Artificial Intelligence (ECAI)

Provides an abstract for each of the keynote presentations and may include a brief professional biography of each View full abstract»

This paper focuses on the theoretical and experimental analyzes on the dynamics of a magneto-piezoelectric pendulum system under the magnetic excitation. Initially, it handles the theoretical modelling of the problem including the mechanical, magnetic and electrical terms of the system. The theoretical formulation of the pendulum system is realized based on the experimental parameters. Then, a det... View full abstract»

Oscillations and waves are important phenomena that are encountered in many different areas of physics. An oscillation is a disturbance in a physical system that is repetitive in time. A wave is a disturbance in an extended physical system that is both repetitive in time and periodic in space. In general, an oscillation involves a continuous back and forth flow of energy between two different ener... View full abstract»

This paper presents a method for emotion recognition by using LLE - Largest Lyapunov exponent of the Mel-frequency energy bands for the Romanian language. The emotion recognition for features vectors that contains LLE is better using Support Vector Machine - SVM classifier (76.4%) than Weighted K-Nearest Neighbors - WKNN classifier (72.8%). The most efficient combination was LLE with LPC - linear ... View full abstract»

This paper presents an efficient segmentation method which uses simple neural network architecture. The goal was to implement an automatic annotation instrument of the vocal signal, capable to make the separation between vowel and consonant signal, respectively pauses between utterances. This instrument is used in the features extraction from the vowels areas by an emotion recognition application ... View full abstract»

This paper describes a new 2-1 cascaded hybrid sigma delta modulator where the discrete time filter is realized with fully differential current conveyor. The hybrid convertor, which is a combination of an analog integrator and two digital integrators, offers an increased dynamic range, helps make the resulting high-order sigma delta modulator stable and reduce power consumption comparing with disc... View full abstract»

In a communication system having a limited bandwidth, it is very important to analyze the spectrum. The spectral analysis is performed by measuring the power of signal within a specific frequency band. A commercial spectrum analyzer is usually employed for instrument equipment and cannot be utilized for a communication auxiliary device because of its high cost. In this study, the low-cost digital ... View full abstract»

In this paper, the design of the LDPC decoder architecture in IEEE 802.11n/ac is proposed. The proposed decoder is used to the partial parallel architecture to provide 2 Gbps throughput at 200 MHz clock frequency. In IEEE 802.11n/ac, 12 parity check metrics is provide to support diverse code rates and block lengths. Therefore the network between nodes is configured to be satisfied parity check met... View full abstract»

With the ever increasing complexity of the high speed digital and analog design both time and frequency analyses are to be considered. The present paper presents a brief overview on linear and nonlinear simulations type and evaluation of the effects of choosing transient or harmonic balance in evaluation of interconnections on a printed circuit board by using eye diagram tool. View full abstract»

In the post-9/11 world, fleet managers, government officials, public safety personnel, and other stakeholders have become concerned about the potential for attacks involving trucks, containers, or other elements of the global transportation infrastructure. The current smart city trend focuses on providing an intelligent, interoperable and secure environment for all citizens. The cloud based Studen... View full abstract»

Reactant (hydrogen and air) starvation during PEMFCs operation can produce serious irreversible damages. To preventing reactant starvation and, at the same time, to allow a dynamic operation of the fuel cell system, both stoichiometric ratio γH2 and stoichiometric ratio γAir of the input gases need to be adjusted rapidly during sudden load change. In order to st... View full abstract»

This paper is focused on the nonlinear behavior of the DC-DC converters. In the first part of this paper, the basic topologies of the DC-DC converters are analyzed and modeled. The general linear model for the Buck, Boost and Buck-Boost topologies is presented and used in the simulation performed in the second part of this paper. Also, the main tools used to study their nonlinear behavior are show... View full abstract»

As it was mentioned in the first part, this paper is focused on the nonlinear behavior of the DC-DC converters. The Buck converter was chosen to apply different tools in order to analyze the stability of operation under voltage and current control. Also, besides the qualitative information given by the graphical methods used, the performances of the control techniques are evaluated in time and fre... View full abstract»

This paper proposes a structure for a digital coder, optimizing the multiplication circuit area that leads to a substantial gain in the main circuit surface and helps future decoding. The work describes the functioning process, the technical design and tests the coder's main functions. The evolution of RS coding and the growing pallet of application domains are also briefly covered. View full abstract»

Space Vector Pulse Width Modulation (SVPWM) technique is extensively used to control the three-phase voltage source inverter (VSI) of wind energy systems. The main advantages of SVPWM method are fixed switching frequency, low harmonic content and higher DC bus utilization. In terms of the use of the DC bus voltage compared to conventional PWM method provides 15.15% more efficient usage. This paper... View full abstract»

A novel automatic meteor detection approach, using a self-organizing map type of artificial neural network is presented in this paper. The proposed solution aims at analyzing a given dataset and extracting the meteor signals present in it. For this, a self-organizing map is trained using radio recordings. This neural network will then be used on a test dataset to check the performances of the prop... View full abstract»

Robotic systems have changed and evolved dramatically over the last decades. However, old and modern robots continue to co-exist in research laboratories worldwide. Outdated robots lack sufficient computing power, and need an improvement of their hardware and software capabilities. How to achieve that with minimal costs is a matter of concern of robotics researchers and practitioners. The main con... View full abstract»

In this paper a multicell converter with three cells is introduced. The general operation of such a converter and the mathematical model are presented. The main goal is to define a new control algorithm using a Petri Net that was achieved by developing a logic diagram based on the converter's operation modes and implement it into an algorithm simulated in Mathlab-Simulink. View full abstract»

This paper propose the use of “Proportional-Resonant” (PR) controllers for Power Factor Correction (PFC) circuits used in front-end converters for grid-connected applications. The performance of the PFC converter with PR control is analyzed using simulations and the advantages and disadvantages of this kind of control are discussed. The classical PI controllers and the PR controllers... View full abstract»

In this paper a shunt three phase active power filter with reference values based on p-q theory, using sliding mode control, is presented. The nonlinear load is composed either of a capacitive and an inductive, or just an inductive component. The filter is analyzed and the mathematical model of the inverter, the state equations of the power system, the sliding mode control with the existence condi... View full abstract»

The aim of the paper is to adapt some basic algorithms of detection theory used in communication systems, as solutions in the process of change detection and diagnosis based on statistical signal processing paradigm. Two methods are considered: a classical one based on maximum a posteriori probability detection rule and, respectively, a sequential detection procedure. Both methods are studied in t... View full abstract»