A5011188498- Acoustic Wave Phenomena Research
- Aerodynamics and Acoustics in Jet Flows
- Advanced Memory and Neural Computing
- Semiconductor materials and devices
- Ferroelectric and Negative Capacitance Devices
- Metamaterials and Metasurfaces Applications
- Noise Effects and Management
- Phase-change materials and chalcogenides
- Advanced Multi-Objective Optimization Algorithms
- Probabilistic and Robust Engineering Design
- Neuroscience and Neural Engineering
- CCD and CMOS Imaging Sensors
- Thermal Radiation and Cooling Technologies
- Electromagnetic Scattering and Analysis
- Neural dynamics and brain function
- Engineering Diagnostics and Reliability
- Vehicle Noise and Vibration Control
- Combustion and flame dynamics
- Advanced Antenna and Metasurface Technologies
- Parallel Computing and Optimization Techniques
- Aerodynamics and Fluid Dynamics Research
- Simulation Techniques and Applications
- Structural Load-Bearing Analysis
- Turbomachinery Performance and Optimization
- Granular flow and fluidized beds
Institute of Marine Engineering
2024-2025
National Research Council
2024-2025
Roma Tre University
2017-2024
Volterra (United Kingdom)
2017-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2012-2016
Direction de la Recherche Technologique
2014-2016
CEA LETI
2012-2014
Institut polytechnique de Grenoble
2012-2014
CEA Grenoble
2012-2014
Université Grenoble Alpes
2012-2013
In this paper, we present an alternative approach to neuromorphic systems based on multilevel resistive memory synapses and deterministic learning rules. We demonstrate original methodology use conductive-bridge RAM (CBRAM) devices as, easy program low-power, binary with stochastic New circuit architecture, programming strategy, probabilistic spike-timing dependent plasticity (STDP) rule for two different CBRAM configurations with-selector (1T-1R) without-selector (1R) are proposed. show...
In this work, we demonstrate an original methodology to use Conductive-Bridge RAM (CBRAM) devices as binary synapses in low-power stochastic neuromorphic systems. A new circuit architecture, programming strategy and probabilistic STDP learning rule are proposed. We show, for the first time, how intrinsic CBRAM device switching probability at ultra-low power can be exploited implement rule. Two complex applications demonstrated: real-time auditory (from 64-channel human cochlea) visual...
This paper addresses two technologies as an example of optimized devices for FPGA and fixed-logic IC design (as non volatile Flip-Flops).
Metamaterials and metasurfaces disclosed new degrees of freedom in controlling the acoustic field. Exploiting generalized Snell law reflection, assembly subwavelength unit cells is able to achieve extraordinary refraction reflection by means a controlled phase delay introduced field treated boundaries. The space-coiling design one most powerful for this metadevice class, providing effective low-thickness metasurfaces. However, suffers from narrow frequency operating range due intrinsic...
Metamaterials, man-made composites that are scaled smaller than the wavelength, have demonstrated a huge potential for application in acoustics, allowing production of sub-wavelength acoustic absorbers, invisibility, perfect mirrors and lenses hyper focusing, illusions enabling new degrees freedom control field. The zero, or even negative, refractive sound index metamaterials offers possibilities patterns at scales. Despite tremendous growth research on during last decade, metamaterial-based...
The “Advanced Particle–astrophysics Telescope” (APT) is a mission concept for future space-based MeV-TeV observatory, that will combine Compton and e + − pair telescope. A small-scale prototype, the “Antartic Demonstrator APT” (ADAPT), currently being developed to fly on balloon in Antarctica during local 2025-2026 flight season. Among its subdetectors there hodoscope consists of four layers interleaved scintillating fibers coupled Silicon Photomultipliers (SiPMs). multichannel electronics...
This article presents the data-driven equation-free modeling of dynamics a hexafloat floating offshore wind turbine based on application dynamic mode decomposition (DMD). The DMD has here been used (i) to extract knowledge from system through its modal analysis, (ii) for short-term forecasting (nowcasting) immediate past state, and (iii) identification reduced-order modeling. All analyses are performed experimental data collected an operating prototype. nowcasting method motions,...
In this work, for the first time at our knowledge, improvement of chalcogenide-based CBRAM performance and reliability by Sb doping GeS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> electrolyte is presented. An original analysis, based on in-depth physico-chemical characterization, device electrical measurements, empirical model principle calculations, shown. We argue that optimized ~10% in allows to achieve SET speed 30ns 2.2V (i.e....
We present an original methodology to design hybrid neuron circuits (CMOS + non volatile resistive memory) with stochastic firing behaviour. In order implement firing, we exploit unavoidable intrinsic variability occurring in emerging non-volatile memory technologies. particular, use the on `time-to-set' (t <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">set</sub> ) and `off-state resistance' (R...
Aeroacoustics of innovative aircraft cannot disregard the development low-order models for jet noise source, which are essential to assess propulsion–airframe interactions from conceptual design stage. The main scope this work is provide a source model that can be coupled with relatively low computational cost methods aeroacoustic scattering. To end, paper presents first time multiobjective optimization zeroth-mode wave-packet in near field. importance calibrating near-field pressure data...
Abstract The effect of background flows on the response acoustic metamaterials is a key aspect that prevented full disclosure their potential in those applications where an aerodynamic velocity field strongly influences propagation disturbances. Indeed, classic approaches for metamaterial design do not consider aeroacoustic interaction, and resulting cannot preserve when operating flows. So far, only few authors have addressed problem, mostly focusing understanding phenomenon or identifying...
The paper presents a method to modify the mechanical properties of statically–designed metamaterial device in order preserve its performance when operating non–uniform aerodynamic flow. objective research is contribute disclosure acoustic potential aeroacoustic applications, where propagation and scattering are deeply affected by convection. emphasis on aeronautical applications aiming at development methods for design breakthrough solutions aircraft noise mitigation. present approach based...
The present work reports an investigation on the use of adaptive metamodels based radial basis functions (RBFs) for aeroacoustic applications highly innovative configurations. relevance topic lies paramount importance metamodelling techniques within design optimisation process disruptive aircraft layouts. Indeed, air traffic growth, consequently hard environmental constraints imposed by regulations, will make a technological breakthrough, imperative need few years. As consequence,...
Acoustic metamaterials and metasurfaces often present complex geometries microstructures. The development of models reduced complexity is fundamental to alleviate the computational cost their analysis derivation optimal designs. main objective this paper validation a metacontinuum model for phase gradient-based metasurfaces. method based on transformation acoustics framework defines metasurface in terms anisotropic inertia bulk modulus. Thermal viscous dissipation effects are accounted by...
In this paper, the effect of active layer thickness and temperature on switching kinetics GeS 2 -based conductive bridge memories is addressed through electrical characterization. Results are explained in terms a thermally field driven ion hopping model for reversible resistance switching. The combined analysis reveals that at high set voltage decrease. Furthermore, study suggests applying same reset condition, thicknesses lower than 50 nm, filament almost dissolved, while thicker layers...
In this paper, we show performance and reliability improvement of Ag- GeS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -based conductive bridge RAM (CBRAM) devices by addition a 2-nm-thick HfO layer between the electrolyte W bottom electrode. Our optimized dual-layer stack (2-nm -30-nm ) leads to resistance ratio (R xmlns:xlink="http://www.w3.org/1999/xlink">OFF</sub> /R xmlns:xlink="http://www.w3.org/1999/xlink">ON</sub> higher than...
The objective of the paper is assessment Analogue Transformation Acoustics (ATA) in design acoustic metamaterial for aeronautical applications. work focuses on consistency background flow resulting from application ATA with equations governing potential aerodynamics. Indeed, case perturbations propagating within moving media, convective terms are responsible failure formal invariance under action conformal mappings. approach overcomes this limitation, introducing possibility handling form...
Metamaterials might be one of the breakthrough technologies needed from aeronautic industry to achieve more and challenging targets set by international authorities, especially about noise emissions. In this article, a theoretical link between Transformation Acoustics Generalized Snell’s Law, two widely used metamaterial models, is demonstrated analytically applied case studies. The relevance connection in aeroacoustic field discussed along with consequent computational advantages for...
In this paper, we present a new empirical model able to explain the main features of set and reset processes in Ag-GeS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Conductive Bridging Memories. The is carefully validated on wide number experimental data, precisely designed for scope. particular, electrical tests were performed both quasi static pulse modes industrial CBRAM cells. simulations here reported provide insights device...
Modern turbofans with high bypass ratios, low blade passage frequencies and short nacelles require continuous development of acoustic linings to achieve the noise reductions expected by international aviation authorities. Metamaterials metafluids have been recently proposed as promising technologies for designing innovative treatments dedicated reducing aeronautic turbofan emissions. In this work, a phase-gradient metasurface treatment is investigated way tackle radiation from an axially...
Metamaterials, man-made composites scaled smaller than the wavelength, have demonstrated a huge potential in their applications acoustics, opening up for sub--wavelength acoustic absorbers, invisibility, perfect mirrors and lenses hyper focusing, illusions enabling new degrees of freedom control field. The zero, or even negative, refractive sound index metamaterials offers possibilities pattern at scales. Despite tremendous growth research on during last decade, metamaterial-based...
CBRAMs (Conductive Bridging Random Access Memory) are a kind of Resistive Memories (RRAMs) fabricated in the BEOL (Back-End-Of-Line). They promising breakthrough for including permanent retention mechanisms (non-volatility) embedded systems at low cost. Thus, they becoming very interesting designers community as well. To use this device to design innovative circuits, compact model is mandatory. In paper, we propose continuous physical model, written Verilog-A. Main advantage approach its...