Maria-Angeles Cifredo-Chacón

• PhD
• Professor (Full) at Universidad de Cádiz

In recent years, nanosatellites have revolutionized the space sector due to their significant economic and time-saving advantages. As a result, they have fostered the testing of advanced instruments intended for larger space science missions. The case of MELISA is presented in this work. MELISA is a magnetic measurement instrument which aims at dem...

In the pursuit of enhancing the technological maturity of innovative magnetic sensing techniques, opportunities presented by in-orbit platforms (IOD/IOV experiments) provide a means to evaluate their in-flight capabilities. The Magnetic Experiments for the Laser Interferometer Space Antenna (MELISA) represent a set of in-flight demonstrators design...

In recent years, nanosatellites have revolutionized the space sector due to their significant economic and time-saving advantages. As a result, they have fostered the testing of advanced instruments intended for larger space science missions. The case of the Magnetic Experiment for the Laser Interferometer Space Antenna (MELISA) is presented in thi...

Pyroelectric infrared sensors (PIR) are widely used as infrared (IR) detectors due to their basic implementation, low cost, low power, and performance. Combined with a Fresnel lens, they can be used as a binary detector in applications of presence and motion control. Furthermore, due to their features, they can be used in autonomous intelligent dev...

This paper aims to advance the field of data anonymization within the context of Internet of Things (IoT), an environment where data collected may contain sensitive information about users. Specifically, we propose a privacy-preserving data publishing alternative that extends the privacy requirement to the data collection phase. Because our proposa...

Hardware implementations of spiking neural networks in portable devices can improve many applications of robotics, neurorobotics or prosthetic fields in terms of power consumption, high-speed processing and learning mechanisms. Analog and digital platforms have been previously proposed to run these networks. Analog designs are closer to biology sin...

Motivated by the effects of deregulation over power quality and the subsequent need of new types of measurements, this paper assesses different implementations of an estimate for the spectral kurtosis, considered as a low-level harmonic detection. Performance of a processor-based system is compared with a field programmable gate array (FPGA)-based...

Digital native generations have been technology consumers all their life. Our children should be educated to be capable to contribute, as active producers, to the digital framework with a maturity and critical attitude. To do that children should learn to program from very early stage at school and combine this with electronics can be the right way...

Power-line signal analysis according to international standards implies the acquisition of signals with a stable frequency. However, the value of this frequency falls in a relatively wide range. That frequency stability allows the adoption of an acquisition scheme where it is not allowed to use another window function other than the rectangular one...

Autonomous measurement units are indispensable for the development of the smart grid in order to get faster processing responses, stability, and to provide the user with information regarding power quality (losses, harmonics, outages, steady-state and transient events). In this paper, the development of a novel FPGA-based real-time analyzer is pres...

Digital native generations have been technology consumers all their lives, but they have never created anything with it and they have no idea how these technologies work. Computational thinking has not been fostered within the digital-native generations, in a way to encourage the development of other important skills, such as reasoning, problems so...

The theoretical teaching of Computer Architecture is not suitable longer. In the present time, students claim for a learning-by-doing according to their dynamic and active character. Nowadays, interactive teaching is possible thanks to the decrease in the prices of the Field Programmable Gate Arrays. This paper proposes a learning-by-doing methodol...

This paper evaluates three different solutions to distribute a list of independent tasks among the nodes of a cluster of computers. Operative systems are unable to take advantage of modern multicore or multiprocessor based computers in the execution of this kind of work when it is not paralellized, thus, the availability of a software tool that all...

This paper presents an accurate and simple delay measurement method based on Xilinx's Digital Clock Managers. Particularly, variable phase shift is the modules' capability exploited in our approach. This method enables the implementation of a time-to-digital converter that achieves a resolution of 200ps on a Xilinx's Virtex or Spartan-3 FPGA withou...

This paper presents a time-to-digital converter based on Virtex FPGA's reconfiguration and phase shifting capabilities. Concretely, the converter is built around a Digital Clock Manager, and phase shift is the module's characteristic that is modified through reconfiguration. The proposed conversion method shifts an internally generated clock signal...

This paper presents an algorithm for the generation of the values to be loaded in the control cells of a Boundary-Scan (BS) chain during an interconnect test. The algorithm selects several groups of control cells while avoiding that two or more drivers excite the same net at the same time, allowing every net to be active for every test vector and t...

In this paper we show how a printed circuit board (PCB) that includes a reconfigurable Field-Programmable Gate Array (FPGA) can be adapted to incorporate the capability of performing a Boundary-Scan (BS) infrastructure and interconnect self-test. The process is based on the reconfiguration of the FPGA: during the self-test procedure the FPGA is con...

In this paper we present a group of VHDL functions that generate the interconnection test vectors for a boundary-scan board. The functions are part of a synthesizable VHDL model for a boundary-scan chain, to be received from it, and to enable the evaluation of the received response. The information needed by these functions are the boundary-scan da...