Rodrigo Picos

Artificial intelligence has endowed robots with cognitive abilities that significantly improve their performance in various applications. According to Neuroscience, information in the biological brain is processed at the neuronal level by electrical impulses that are transmitted to neighbouring neurons via electrochemical processes. This discovery radically changed the way neurons are modelled in artificial neural networks,…

Stochastic resonance (SR) effect observed in biological, physical, and engineering systems is commonly described quantitatively by power spectral measures that require complex mathematical operations and long, continuous observation. Here, we propose two measures based on the switch-phase distribution to qualitatively describe the SR effect, namely, the power norm and the probability that the switch phase…

In this letter, a fully behavioral SPICE model for M × N memristive crosspoint arrays (CPAs) is presented. The proposed approach incorporates the current–voltage characteristics of the memdiode model for resistive switching devices, which can account for both the linear (low-voltage) and nonlinear (high-voltage) transport regimes of memristors. At low voltages, the model coincides with the conventional…

Ensuring the confidentiality, integrity and authenticity of transmitted data for single- and multi-agent systems is becoming crucial to protect these systems against potential threats. This is precisely the focus of this work that introduces a novel approach for securing communications between unmanned aerial vehicles (UAVs). In particular, to safeguard the data against attacks in UAV…

Memristors, first theorized in 1971 and experimentally confirmed in 2009, have attracted substantial research interest due to their unique characteristics. They are particularly significant in applications like neuromorphic computing and memory storage. However, memristive behavior is not always an isolated phenomenon; it can also emerge as a parasitic effect in various electronic devices. Despite this,…

Stochastic resonance (SR) can be defined as a phenomenon where the response of dynamical nonlinear systems to a weak input signal may be augmented due to the existance of noise tuned to the optimal level. Among others, the SR effect is quantified using measures as the signal-to-noise ratio, the output autocorrelation function, the residence time…

Memristors are one of the four fundamental electrical components, relating electrical quantities such as current, voltage, charge (integral of current), and flux (integral of voltage). First proposed in 1971 and experimentally demonstrated in 2009, memristors have garnered significant research interest due to their unique properties. Among their many applications, neuromorphic computing and memory storage stand…

A multi-layer thin-film device was fabricated on a glass substrate. The antimony selenide (Sb2Se3) layer was synthesized onto a molybdenum-coated (Mo/MoSe2) soda-lime glass (SLG) substrate using a co-evaporation process. The co-evaporation process was conducted in a high-pressure furnace at 2 atmospheres of argon gas for 20 minutes. The antimony (Sb) and selenium (Se) evaporation temperatures…

Autonomous systems have demonstrated high performance in several applications. One of the most important is localisation systems, which are necessary for the safe navigation of autonomous cars or mobile robots. However, despite significant advances in this field, there are still areas open for research and improvement. Two of the most important challenges include the precise…

In this study, we present the impact of irradiation on the memristive properties of solid polymer electrolyte memristor devices with a Ti/PMA/PEO/PMA/(Ti or Au) structure. The devices were measured before irradiation and after 1 krad and 2 krad total doses. The effects of irradiation appear to be an improvement in both conductance and hysteresis after…

We present a procedure to monitor the temporal evolution of the trapped charge in floating gates of organic thin film transistors (OTFTs) based memories in dynamic regimes. The potential applications of organic semiconductors in flexible and wearable electronics and their known features such as low-temperature and solution fabrication make the OTFTs be considered as candidates…

This paper provides an overview of the main research activities carried out by Spanish organizations in areas related to neuromorphic technologies, spanning physical, materials, circuitry, and architectural levels. It also discusses the potential of these technologies to create competitive advantages for the Spanish industry, and to foster new applications and business opportunities via deep-tech startups…

In this work, we present a secure communication system based on synchronised Lorenz chaotic circuits. Drawing inspiration from similar works based on nonlinear Chua circuits, our secure communication system is based upon the synchronisation of two Lorenz circuits. One of these nonlinear circuits is incorporated into the transmitter and the other one into the receiver….

In this paper we present a model describing the memristive behavior of a dual filament bulb that includes the thermal coupling between the filaments. The model is implemented with Matlab. The model, that represents the physical mechanisms behind the memristive behavior of filaments and coupling effect, is compiled according to the theoretical framework notation.