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The trends in power DC/DC conversion are not only size and weight reduction together with a good efficiency; EMI and mass production are a must as well. In this context, piezoelectric transformers seem to be the ideal solution, since they allow higher switching frequencies (size and weight reduction) while also providing high efficiencies. Additionally, they are not magnetic devices, which facilitates...
In this paper, the authors describe the design of an 80kW power converter for an electrostatic precipitator using SiC MOSFETs. The structure of the converter is based on the series parallel resonant topology, PRC-LCC, with a capacitor as output filter. This topology can cope adequately with the parasitic elements of the step-up transformer involved in the application. The SiC switches present lower...
With the bottom-line goal of increasing the throughput of a GPU-accelerated JPEG 2000 encoder, this paper evaluates whether the post-compression rate control and packetization routines should be carried out on the CPU or on the GPU. Three co-processing models that differ in how the workload is split among the CPU and GPU are introduced. Both routines are discussed and algorithms for executing them...
Math's are fundamental in all our activities inclusive daily activities. Dominate them is a challenge to people for all the ages because all this reasons we design and implement a tool that is based in a gamification that permit trough to game to get better the math skills specifically equations of first grade. It prove that students get better skills in resolve equations of first grade using Mahi...
Multitrack audio mixing is an essential part of music production and one of the first steps consist on processing individual stems from raw recordings. In this paper, we investigate this stage as a content-based transformation. We explore which audio features are relevant to interpret this specific process and which set of features gets modified by the mixing of stems in the most consistent way. We...
This paper presents a CMOS digitally programmable band-pass filter with independently controlled parameters, to be employed as a highly reconfigurable preconditioning stage in a general purpose phase sensitive detection (PSD) on-chip instrument to support CMOS impedance and MEM p-resonator-based sensors. Frequency tuning range with a linear dependence over four decades up to 1 MHz is achieved, with...
A CMOS digitally programmable analogue processor used in a neural network to linearize an NTC thermistor is presented in this paper. Particularly, the work focuses on the multiplier block and presents an alternative way to increase the weight resolution without oversizing the system. A neural network designed for linearization of the NTC thermistor is tested. Two architectures (the 8-bit and the proposed...
This paper presents an enhanced digital tuning approach for RC-active direct form circuits. By introducing a combined summing/dividing network for the current that flows from resistors to virtual grounds, an accurate frequency trimming is accomplished bringing out a linear dependence on the digital input code over a wide tuning range. Simulation results of a monolithic 12-bit 1.8 V–0.18 μm CMOS second...
Flight cancellations, departure delays, congestion in taxi times and airborne holding delays are increasingly frequent problems that negatively impact the performance, fuel burn, emissions rate and customer satisfaction at major airports in the world. However, this is just a brushstroke of the future to come. The dramatic growth in the air traffic levels has become a problem of paramount importance,...
Companies deal with different problems that must be solved. Operations Research offers a methodology (SSM) that helps to identify their solutions. This project consisted in analyzing components of a real supermarket process in order to identify process improvements. SSM helped to find feasible improvements which were analyzed applying Agile Requirements.
The following paper presents design and fabrication process of a high gain reflector antenna system carried out within the H2020 M3tera project. This project is focused on the development of a complete microsystem able to work as high rate communication link at D-Band frequencies. The paper presents design and fabrication aspects of two prototypes one fabricated by conventional techniques and the...
Retrieving information from movies is becoming increasingly demanding due to the enormous amount of multimedia data generated each day. Not only it helps in efficient search, archiving and classification of movies, but is also instrumental in content censorship and recommendation systems. Extracting key information from a movie and summarizing it in a few tags which best describe the movie presents...
Subwavelength plasmonic nanoantennas are key elements in nanophotonics, with application prospects in multiple disciplines. Here we show that magnetic (sandwich) nanoantennas can be efficiently integrated on a silicon chip and properly fed by using the TM mode of the waveguide at telecom wavelengths.
In this work we propose a new perspective in order to unveil the mechanism leading to the spin-orbit de/coupling of light at the nanoscale. Taking into account the factorizability condition of the electromagnetic fields we show, by using the spherical vector wave formalism, that this condition is fulfilled only in the far-field region. On the other side, in the near-field region, amplitude (spin)...
We present a Stokes nanopolarimeter based on spin-orbit interaction of light that allows the instantaneous, non-destructive and local measurement of the polarization of light that impinges on it. The system consists of a subwavelength scatterer placed in close proximity to a multimode waveguide, so that the incoming polarization is mapped into amplitudes of the propagating modes. We also show that...
In this work we design an unidirectional invisibility cloak for a diffusive-light medium based on transformation optics, which provides a broadband, passive and polarization-independent performance and can conceal macroscopic objects. Unlike the other cloaking designs based on scattering cancellation or transformation optics, our design can work under transient illumination, which is crucial in many...
In this contribution we deal with the problem of accurately identifying complex permittivities of dielectric objects placed on a conducting surface. Solutions to this problem are becoming increasingly crucial in sensing security scenarios in order to detect forbidden materials concealed on the human body. The proposed approach uses the matrix pencil method (MPM) as an efficient post-processing tool...
Access control is a building block for the overall security of any communication system. In the Internet of Things (IoT), delegated authorization mechanisms are necessary to relieve constrained devices from the duty of identity management and access control tasks. Smart cities require new user-centric authorization approaches for IoT devices that preserve user privacy while guaranteeing scalability...
A combination of two switching surfaces for the sliding-mode control of a boost converter feeding a constant power load is presented. It allows the converter start-up with small inrush current and permits the output voltage regulation by minimizing the effect of external perturbations on the steady-state operation. The resulting sliding-regime for each switching surface is analyzed and the conditions...
In this work, we have used a new concept of sensor-based seed generator in order to generate the keys for a stream cipher based on a new algorithm mixing a Skew Tent Map and a Linear Feedback Shift Register. The cryptosystem has been implemented in a Xilinx Virtex 7 FPGA and has been proven to be fast and secure for application in IoT networks.
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