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The miniaturization of classical electromagnetic transformers raises certain problems such as manufacture both the coils and the magnetic core, increase in magnetic leak and especially electromagnetic pollution of the environment. One interesting solution consists of using a piezoelectric transformer (PT). In this paper a Rosen-type structure of PT has been chosen. The first approach consists of performing...
Piezoelectric ultrasonic motors are superior to electromagnetic micromotors, because their efficiency remains theoretically constant during miniaturization. However, the still relatively recent technology has a considerable unexploited optimization potential. Numerical structural analysis by the means of the finite element method (FEM) is a common approach for dimensioning piezoelectric motors. Consequently,...
The problem of building recommender systems has attracted considerable attention in recent years, but most recommender systems are designed for recommending items for individuals. The aim of this paper is to automatically recommend and rank a list of new items to a group of users. The proposed model can be considered as a collaborative Bayesian network-based group recommender system, where the group's...
Rapidly-spreading malicious software is an important threat on today's computer networks. Most solutions that have been proposed to counter this threat are based on our ability to quickly detect the malware-generated traffic or the malware instances themselves, something that in many cases can be beyond our ability. Nonetheless, it seems intuitive that certain defensive postures adopted in configuring...
A novel metallic wire substrate (MWS) is proposed for miniaturized planar microwave circuits. This MWS consists of a dense array of vertical metallic wires embedded in a regular host substrate. It is demonstrated experimentally to exhibit magneto- dielectrics properties with simultaneously enhanced effective permittivity and permeability in a broad frequency range. Consequently, a substrate of higher...
The aim of this paper is to demonstrate that it is possible to perform a waveguide using parallel plates and some metamaterial surfaces. The lack of lateral metallic walls in the waveguide is replaced by the effect of these metamaterials. An AMC-PEC-AMC structure is designed, simulated and prototyped. The advantage of this structure is due to the planar architecture and its low cost. In this paper,...
This paper presents the characterization of the novel metallic wire substrate (MWS) introduced in [1] and its application to a microstrip patch antenna. It is shown numerically that the MWS exhibits artificial magneto-dielectric properties with simultaneously enhanced effective permittivity and permeability over a large frequency band. Consequently, due to the higher effective refractive index, the...
In recent years, malicious software (malware) has become one of the most insidious threats in computer security. However, this is arguably not the result of increased sophistication in malware design or attack strategies, but rather of the increased presence of computers and computer networks within every aspect of society. In this paper, we address and defend the commonly shared point of view that...
Best efforts have been made in order to assure that the structure works in a proper way. For this reason, in this paper some software simulations and prototype measurement and evaluation was performed. This work demonstrates the feasibility of applying the AMC-PEC-AMC configuration in parallel plate waveguides to enhance the properties of the wave propagation. In the case of using several AMC-PEC-AMC...
The liberalization of the power industry and the creation of electricity spot markets throughout the world has triggered a significant research effort both by academic and practitioners. A part of this effort has been oriented to the development of methodologies and tools devoted to the optimization of bidding strategies for electricity spot markets. Uncertainty with respect to the behavior of the...
This paper presents a low cost, high efficiency, power electronics training platform of modular architecture for educational purposes, based on the PIC family of microcontrollers. It can operate both as a stand-alone system or connected to a standard PC. It is design to be programmed with microchip freeware MPLAB. The platform supports laboratory work in the study of the power stages and the study...
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