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- Elio D. Di Claudio, Francesco Piazza, Gianni Orlandi
- IEEE Trans. Computers
- 1995

Being able to determine the provenience of statements is a fundamental step in any SW trust modeling. We propose a methodology that allows signing of small groups of RDF statements. Groups of statements signed with this methodology can be safely inserted into any existing triple store without the loss of provenance information since only standard RDF… (More)

- Nevio Benvenuto, Francesco Piazza
- IEEE Trans. Signal Processing
- 1992

- Paolo Campolucci, Aurelio Uncini, Francesco Piazza, Bhaskar D. Rao
- IEEE Trans. Neural Networks
- 1999

This paper focuses on on-line learning procedures for locally recurrent neural networks with emphasis on multilayer perceptron (MLP) with infinite impulse response (IIR) synapses and its variations which include generalized output and activation feedback multilayer networks (MLN's). We propose a new gradient-based procedure called recursive backpropagation… (More)

- Michele Marchesi, Gianni Orlandi, Francesco Piazza, Aurelio Uncini
- IEEE Trans. Neural Networks
- 1993

Multilayer perceptrons (MLPs) with weight values restricted to powers of two or sums of powers of two are introduced. In a digital implementation, these neural networks do not need multipliers but only shift registers when computing in forward mode, thus saving chip area and computation time. A learning procedure, based on backpropagation, is presented for… (More)

- Aurelio Uncini, Lorenzo Vecci, Paolo Campolucci, Francesco Piazza
- IEEE Trans. Signal Processing
- 1999

In this paper, a new complex-valued neural network based on adaptive activation functions is proposed. By varying the control points of a pair of Catmull–Rom cubic splines, which are used as an adaptable activation function, this new kind of neural network can be implemented as a very simple structure that is able to improve the generalization capabilities… (More)

- S. Guarnieri, Francesco Piazza, Aurelio Uncini
- IEEE Trans. Neural Networks
- 1999

In this paper, a new adaptive spline activation function neural network (ASNN) is presented. Due to the ASNN's high representation capabilities, networks with a small number of interconnections can be trained to solve both pattern recognition and data processing real-time problems. The main idea is to use a Catmull-Rom cubic spline as the neuron's… (More)

- Aurelio Uncini, Francesco Piazza
- IEEE Trans. Neural Networks
- 2003

In this paper, neural networks based on an adaptive nonlinear function suitable for both blind complex time domain signal separation and blind frequency domain signal deconvolution, are presented. This activation function, whose shape is modified during learning, is based on a couple of spline functions, one for the real and one for the imaginary part of… (More)

- Lorenzo Bongini, Daniele Fanelli, Francesco Piazza, Paolo De Los Rios, Sara Sandin, Ulf Skoglund
- Proceedings of the National Academy of Sciences…
- 2004

The issue of protein dynamics and its implications in the biological function of proteins are arousing greater and greater interest in different fields of molecular biology. In cryo-electron tomography experiments one may take several snapshots of a given biological macromolecule. In principle, a large enough collection of snapshots of the molecule may then… (More)

- Brice Juanico, Y-H Sanejouand, Francesco Piazza, Paolo De Los Rios
- Physical review letters
- 2007

We introduce a topology-based nonlinear network model of protein dynamics with the aim of investigating the interplay of spatial disorder and nonlinearity. We show that spontaneous localization of energy occurs generically and is a site-dependent process. Localized modes of nonlinear origin form spontaneously in the stiffest parts of the structure and… (More)