Search Results for author: Michele Piana

Found 19 papers, 1 papers with code

Greedy feature selection: Classifier-dependent feature selection via greedy methods

no code implementations8 Mar 2024 Fabiana Camattari, Sabrina Guastavino, Francesco Marchetti, Michele Piana, Emma Perracchione

The purpose of this study is to introduce a new approach to feature ranking for classification tasks, called in what follows greedy feature selection.

feature selection

AI-FLARES: Artificial Intelligence for the Analysis of Solar Flares Data

no code implementations2 Jan 2024 Michele Piana, Federico Benvenuto, Anna Maria Massone, Cristina Campi, Sabrina Guastavino, Francesco Marchetti, Paolo Massa, Emma Perracchione, Anna Volpara

AI-FLARES (Artificial Intelligence for the Analysis of Solar Flares Data) is a research project funded by the Agenzia Spaziale Italiana and by the Istituto Nazionale di Astrofisica within the framework of the ``Attivit\`a di Studio per la Comunit\`a Scientifica Nazionale Sole, Sistema Solare ed Esopianeti'' program.

Three-dimensional numerical schemes for the segmentation of the psoas muscle in X-ray computed tomography images

no code implementations10 Dec 2023 Giulio Paolucci, Isabella Cama, Cristina Campi, Michele Piana

The analysis of the psoas muscle in morphological and functional imaging has proved to be an accurate approach to assess sarcopenia, i. e. a systemic loss of skeletal muscle mass and function that may be correlated to multifactorial etiological aspects.

Segmentation

A comprehensive theoretical framework for the optimization of neural networks classification performance with respect to weighted metrics

no code implementations22 May 2023 Francesco Marchetti, Sabrina Guastavino, Cristina Campi, Federico Benvenuto, Michele Piana

In many contexts, customized and weighted classification scores are designed in order to evaluate the goodness of the predictions carried out by neural networks.

Operational solar flare forecasting via video-based deep learning

no code implementations12 Sep 2022 Sabrina Guastavino, Francesco Marchetti, Federico Benvenuto, Cristina Campi, Michele Piana

Operational flare forecasting aims at providing predictions that can be used to make decisions, typically at a daily scale, about the space weather impacts of flare occurrence.

Prediction of severe thunderstorm events with ensemble deep learning and radar data

no code implementations20 Sep 2021 Sabrina Guastavino, Michele Piana, Marco Tizzi, Federico Cassola, Antonio Iengo, Davide Sacchetti, Enrico Solazzo, Federico Benvenuto

The problem of nowcasting extreme weather events can be addressed by applying either numerical methods for the solution of dynamic model equations or data-driven artificial intelligence algorithms.

Binary Classification

Score-oriented loss (SOL) functions

1 code implementation29 Mar 2021 Francesco Marchetti, Sabrina Guastavino, Michele Piana, Cristina Campi

Loss functions engineering and the assessment of forecasting performances are two crucial and intertwined aspects of supervised machine learning.

BIG-bench Machine Learning Binary Classification

Visibility Interpolation in Solar Hard X-ray Imaging: Application to RHESSI and STIX

no code implementations27 Dec 2020 Emma Perracchione, Paolo Massa, Anna Maria Massone, Michele Piana

Space telescopes for solar hard X-ray imaging provide observations made of sampled Fourier components of the incoming photon flux.

Image Reconstruction

Machine learning as a flaring storm warning machine: Was a warning machine for the September 2017 solar flaring storm possible?

no code implementations5 Jul 2020 Federico Benvenuto, Cristina Campi, Anna Maria Massone, Michele Piana

Machine learning is nowadays the methodology of choice for flare forecasting and supervised techniques, in both their traditional and deep versions, are becoming the most frequently used ones for prediction in this area of space weather.

BIG-bench Machine Learning

Gain and Loss of Function mutations in biological chemical reaction networks: a mathematical model with application to colorectal cancer cells

no code implementations3 Apr 2020 Sara Sommariva, Giacomo Caviglia, Michele Piana

This paper studies a system of Ordinary Differential Equations modeling a chemical reaction network and derives from it a simulation tool mimicking Loss of Function and Gain of Function mutations found in cancer cells.

MEM_GE: a new maximum entropy method for image reconstruction from solar X-ray visibilities

no code implementations18 Feb 2020 Paolo Massa, Richard Schwartz, A Kim Tolbert, Anna Maria Massone, Brian R Dennis, Michele Piana, Federico Benvenuto

Although widely used in image deconvolution, this method has been formulated in radio astronomy for the analysis of observations in the spatial frequency domain, and an Interactive Data Language (IDL) code has been implemented for image reconstruction from solar X-ray Fourier data.

Image Deconvolution Image Reconstruction +1 Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics 49N45, 94A08

Desaturating EUV observations of solar flaring storms

no code implementations8 Apr 2019 Sabrina Guastavino, Michele Piana, Anna Maria Massone, Richard Schwartz, Federico Benvenuto

Image saturation has been an issue for several instruments in solar astronomy, mainly at EUV wavelengths.

Astronomy

A hybrid supervised/unsupervised machine learning approach to solar flare prediction

no code implementations21 Jun 2017 Federico Benvenuto, Michele Piana, Cristina Campi, Anna Maria Massone

We introduce a hybrid approach to solar flare prediction, whereby a supervised regularization method is used to realize feature importance and an unsupervised clustering method is used to realize the binary flare/no-flare decision.

BIG-bench Machine Learning Clustering +2

DESAT: an SSW tool for SDO/AIA image de-saturation

no code implementations8 Mar 2015 Richard A Schwartz, Gabriele Torre, Anna Maria Massone, Michele Piana

Saturation affects a significant rate of images recorded by the Atmospheric Imaging Assembly on the Solar Dynamics Observatory.

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