Rodrigo Picos

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 networks,…

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…

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.

This work expands the current state of the art in the field of chaos-based cryptography, by removing the need for a dedicated synchronisation line that provides a shared information channel between the relevant transmitter and the receiver devices. We present two different real-world implementations of a secure digital communication system based on chaotic circuits that…

Providing secure communications has become imperative in single- and multi-agent systems that need to ensure the integrity, confidentiality, and availability of the transmitted data, especially when these systems are employed in critical in-frastructure applications. This work presents a novel approach for secure communications between a group of unmanned aerial vehicles (UAVs) to safeguard the confidentiality…

The two main issues in the area of the Internet of Things are low-resource consumption and secure data transmission. Conjugating both is fairly hard on ensuring security, leading to great efforts in research. The standard cryptography methods currently proposed are based on simplifications of standard protocols, but are still demanding on resources. Chaotic encryption is…

In this work, we propose a model that describes the temporal evolution of the threshold voltage and trapped charge density in Thin-Film Transistors (TFTs) under dynamic conditions, paving the way for the characterization and modeling of memory transistors. The model is expressed as a first-order differential equation for the trapped charge density, which is controlled…

In this work, we present a compact memristor model for bipolar neuromorphic ReRAM devices. The proposed model focuses on a behavioural high level description of the device, and it reproduces some of the most important characteristics (i.e. conductance, energy dissipation), using the number of pulses as the input variable instead of any electrical. Its functionality…