Page 1 of 4

2015 Contribution to journal Open Access

The emergence of self-organization in complex systems-Preface
Paradisi P., Kaniadakis G., Scarfone A. M.
Source: Chaos, solitons and fractals 81 (2015): 407–411. doi:10.1016/j.chaos.2015.09.017
DOI: 10.1016/j.chaos.2015.09.017
Metrics:

2011 Contribution to conference Open Access

Diffusion scaling analysis based on renewal theory: an application to turbulent intermittency
Cesari R., Paradisi P., Allegrini P., Contini D., Donateo A.
Source: International Conference on Statistical Physics, Larnaca (Cyprus), July 11-17, 2011

See at: ISTI Repository Open Access | CNR ExploRA

2012 Journal article Open Access

Erratum: Scaling laws of diffusion and time intermittency generated by coherent structures in atmospheric turbulence (Nonlinear Processes in Geophysics (2012) 19 (113-126))
Paradisi P., Cesari R., Donateo A., Contini D., Allegrini P.
In the paper "Scaling laws of diffusion and time intermit-tency generated by coherent structures in atmospheric tur-bulence" by P. Paradisi et al. (Nonlin. Processes Geophys.,19, 113-126, 2012) the wrong Fig. 3 was inserted. The cor-rect Fig. 3 is shown on the right-hand side, together with theoriginal captionSource: Nonlinear processes in geophysics 19 (2012): 685. doi:10.5194/npg-19-685-2012
DOI: 10.5194/npg-19-685-2012
Metrics:

See at: Nonlinear Processes in Geophysics (NPG) Open Access | npg.copernicus.org | Nonlinear Processes in Geophysics (NPG) | Nonlinear Processes in Geophysics (NPG) | CNR ExploRA

2005 Journal article Open Access

Fluorescence intermittency in blinking quantum dots: Renewal or slow modulation?
Simone Bianco, Paolo Grigolini, Paolo Paradisi
We study the time series produced by blinking quantum dots, by means of an aging experiment, and we examine the results of this experiment in the light of two distinct approaches to complexity, renewal and slow modulation. We find that the renewal approach fits the result of the aging experiment, while the slow modulation perspective does not. We make also an attempt at establishing the existence of an intermediate condition.Source: The Journal of chemical physics 123 (2005): 174704-1–174704-10. doi:10.1063/1.2102903
DOI: 10.1063/1.2102903
DOI: 10.48550/arxiv.cond-mat/0509608
Metrics:

2013 Journal article Restricted

Is temporal scaling at the basis of allometry? Comment on "Physiologic time: A hypothesis" by West and West
Allegrini P., Paradisi P., Menicucci D., Gemignani A.
This is a commentary to the paper West D, West BJ. Physiologic time: a hypothesis. Physics of Life Reviews 2013;10(2):210-24 discussing about allometry and universal power-laws in living systems.Source: Physics of life reviews (Print) 10 (2013): 233–234. doi:10.1016/j.plrev.2013.04.009
DOI: 10.1016/j.plrev.2013.04.009
Metrics:

See at: Physics of Life Reviews Restricted | www.sciencedirect.com | CNR ExploRA

2010 Journal article Open Access

Fractal complexity in spontaneous EEG metastable-state transitions: new vistas on integrated neural dynamics
Allegrini P., Paradisi P., Menicucci D., Gemignani A.
Resting-state EEG signals undergo Rapid Transition Processes (RTPs) that glue otherwise stationary epochs. We study the fractal properties of RTPs in space and time, supporting the hypothesis that the brain works at a critical state. We discuss how the global intermittent dynamics of collective excitations is linked to mentation, namely non-constrained non-task-oriented mental activity.Source: Frontiers in physiology 1 (2010): 128–129. doi:10.3389/fphys.2010.00128
DOI: 10.3389/fphys.2010.00128
Metrics:

2013 Contribution to conference Restricted

Renewal and fractionality in the brain
Paradisi P.
Renewal theory is the basic ingredient of Continuous Time Random Walk (CTRW) models and our analyses show that the intermittent behavior of brain events can be modelled through fractal renewal processes. In the long-time limit, CTRW models with appropriate scaling properties, are known to obey generalized diffusion equations with fractional derivatives in time and/or space. Is it possible to develop a CTRW model for the anomalous transport of information in the brain and, consequently, to derive a fractional model of the brain ?Source: Chaos, Solitons and Fractals Conference, Amsterdam, The Netherlands, 29 November 2013

See at: www.journals.elsevier.com Restricted | CNR ExploRA

2020 Contribution to conference Open Access

Augmented reality and intelligent systems in Industry 4.0
Benassi A., Carboni A., Colantonio S., Coscetti S., Germanese D., Jalil B., Leone R., Magnavacca J., Magrini M., Martinelli M., Matarese F., Moroni D., Paradisi P., Pardini F., Pascali M., Pieri G., Reggiannini M., Righi M., Salvetti O., Tampucci M.
Augmented reality and intelligent systems in Industry 4.0 - Presentazione ARTESSource: ARTES, 12/11/2020
DOI: 10.5281/zenodo.4277713
DOI: 10.5281/zenodo.4277712
Metrics:

See at: ISTI Repository Open Access | CNR ExploRA

2015 Report Unknown

SEMEOTICONS - Gas sensors for breath analysis
D'Acunto M., Germanese D., Magrini M., Paradisi P., Righi M., Pagliei E., Gimeno M.
In this deliverable 3.5.1, we report the first 15-months activity within the Work Packages 3 (Multispectral data analysis and sensors development) task 3.5. The task 3.5 provides the manufacturing of a device for breath analysis: the Wize Sniffer (WS), a new portable device for breath analysis limited to an effective number of substances.Source: Project report, SEMEOTICONS, Deliverable D3.5.1, 2015
Project(s): SEMEOTICONS via OpenAIRE

See at: CNR ExploRA

2019 Journal article Open Access

A Hypothesis about parallelism vs. seriality in dreams
Barcaro U., Paradisi P., Sebastiani L.
The process of dream building implies the construction of a complex network of closely interrelated sources. On the other hand, the dream experience develops as a succession of events. In this paper a hypothesis is advanced about how the psycho-physiological system of dream building, which is distributed, acts to provide a serial output. This hypothesis is basically connected with the property, enjoyed by the dream experience, of simultaneously representing a plurality of meanings.Source: Frontiers in Psychology 10 (2019): 2299-1–2299-4. doi:10.3389/fpsyg.2019.02299
DOI: 10.3389/fpsyg.2019.02299
Metrics:

2023 Report Unknown

THE D.3.2.1 - AA@THE User needs, technical requirements and specifications
Pratali L., Campana M. G., Delmastro F., Di Martino F., Pescosolido L., Barsocchi P., Broccia G., Ciancia V., Gennaro C., Girolami M., Lagani G., La Rosa D., Latella D., Magrini M., Manca M., Massink M., Mattioli A., Moroni D., Palumbo F., Paradisi P., Paternò F., Santoro C., Sebastiani L., Vairo C.
Deliverable D3.2.1 del progetto PNRR Ecosistemi ed innovazione - THESource: ISTI Project Report, THE, D3.2, 2023

See at: CNR ExploRA

2010 Journal article Open Access

Complex intermittency blurred by noise: theory and application to neural dynamics
Allegrini P., Menicucci D., Bedini R., Gemignani A., Paradisi P.
We propose a model for the passage between metastable states of mind dynamics. As changing points we use the rapid transition processes simultaneously detectable in EEG signals related to different cortical areas. Our model consists of a non-Poissonian intermittent process, which signals that the brain is in a condition of complexity, upon which a Poisson process is superimposed. We provide an analytical solution for the waiting- time distribution for the model, which is well obeyed by physiological data. Although the role of the Poisson process remains unexplained, the model is able to reproduce many behaviors reported in literature, although they seem contradictory.Source: Physical review. E, Statistical, nonlinear and soft matter physics (Online) 82 (2010): 015103-1–015103-4. doi:10.1103/PhysRevE.82.015103
DOI: 10.1103/physreve.82.015103
Metrics:

See at: pre.aps.org Open Access | Physical Review E Restricted | CNR ExploRA

2013 Contribution to conference Restricted

Linking fractional calculus to real data
Paradisi P.
I will review some well-known theoretical findings about fractional calculus and, in particular, the links between fractal intermittency, the Continuous Time Random Walk (CTRW) model and the emergence of Fractional Diffu- sion Equations (FDE) for anomalous diffusion. In this framework, I will show how fractional operators are associated with the existence of renewal events, a typical feature of complex systems. I will also discuss the possibile connections with critical phenomena. Then, I will introduce some statistical methods allowing to understand when a real system could be described by means of fractional models. Finally, I will show some applications to real data from nano-crystal fluores- cence intermittency, human brain dynamics and atmospheric turbulence.Source: FCPNLO 2014 - Fractional Calculus, Probability and Non-local Operators: Applications and Recent Developments. A workshop on the occasion of the retirement of Francesco Mainardi, Bilbao, Spain, 6-8 November 2013

See at: sites.google.com Restricted | CNR ExploRA

2015 Report Unknown

SEMEOTICONS - Design and integration of the Wize Sniffer
D'Acunto M., Germanese D., Magrini M., Paradisi P., Puppi D., Righi M., Pagliei E., Gimeno M.
The activity from month 15 to month 22 was focused on (i) the fine tuning of the Wize Sniffer (WS) hardware/software platform, (ii) on the development of customized sensors made using PANi as sensing material, (iii) on the integration of the Wize Sniffer within the Wize Mirror, and (iv) on the definition of the methods for WS data analysis. In the framework of SEMEOTICONS Project, by the data collected by the WS, we provide useful information about the "breath-print", i.e., the analog of fingerprint for the state of health of an individual, to be used in the Virtual Individual Model.Source: Project report, SEMEOTICONS, Deliverable D3.5.2, 2015
Project(s): SEMEOTICONS via OpenAIRE

See at: CNR ExploRA

2016 Journal article Open Access

Fractional kinetics emerging from ergodicity breaking in random media
Molina-García D., Pham T. M., Paradisi P., Manzo C., Pagnini G.
We present a modeling approach for diffusion in a complex medium characterized by a random length scale. The resulting stochastic process shows subdiffusion with a behavior in qualitative agreement with single-particle tracking experiments in living cells, such as ergodicity breaking, p variation, and aging. In particular, this approach recapitulates characteristic features previously described in part by the fractional Brownian motion and in part by the continuous-time random walk. Moreover, for a proper distribution of the length scale, a single parameter controls the ergodic-to-nonergodic transition and, remarkably, also drives the transition of the diffusion equation of the process from nonfractional to fractional, thus demonstrating that fractional kinetics emerges from ergodicity breaking.Source: Physical review. E (Print) 94 (2016). doi:10.1103/PhysRevE.94.052147
DOI: 10.1103/physreve.94.052147
DOI: 10.48550/arxiv.1508.01361
Metrics:

2009 Journal article Open Access

Spontaneous brain activity as a source of ideal 1/f noise
Paolo Allegrini, Danilo Menicucci, Remo Bedini, Leone Fronzoni, Angelo Gemignani, Paolo Grigolini, B. J. West, Paolo Paradisi
We study the electroencephalogram (EEG) of 30 closed-eye awake subjects with a technique of analysis recently proposed to detect punctual events signaling rapid transitions between different metastable states. After single-EEG-channel event detection, we study global properties of events simultaneously occurring among two or more electrodes termed coincidences. We convert the coincidences into a diffusion process with three distinct rules that can yield the same \mu only in the case where the coincidences are driven by a renewal process. We establish that the time interval between two consecutive renewal events driving the coincidences has a waiting-time distribution with inverse power-law index \mu about 2 corresponding to ideal 1 / f noise. We argue that this discovery, shared by all subjects of our study, supports the conviction that 1 / f noise is an optimal communication channel for complex networks as in art or language and may therefore be the channel through which the brain influences complex processes and is influenced by them.Source: Physical review. E, Statistical, nonlinear and soft matter physics (Online) 80 (2009): 061914-1–061914-13. doi:10.1103/PhysRevE.80.061914
DOI: 10.1103/physreve.80.061914
Metrics:

See at: Physical Review E Open Access | pre.aps.org | Physical Review E Restricted | CNR ExploRA

2006 Journal article Restricted

Periodic trend and fluctuations: The case of strong correlation
O. C. Akin, Paolo Paradisi, Paolo Grigolini
We study the effects of an external periodic perturbation on a Poisson rate process, with special attention to the perturbation-induced sojourn-time patterns. We show that these patterns correspond to turning a memory-less sequence into a sequence with memory. The memory effects are stronger the slower the perturbation. The adoption of a de-trending technique, applied with no caution, might generate the impression that no fluctuation-periodicity correlation exists. We find that this is due to the fact that the perturbation-induced memory is a global property and that the result of a local in time analysis would not find any memory effect, insofar as the process under study is locally a Poisson process. We find that an efficient way to detect this memory effect is to analyze the moduli of the de-trended sequence. We turn the sequence to analyze into a diffusion process, and we evaluate the Shannon entropy of the resulting diffusion process. We find that both the original sequence and the suitably processed de-trended sequence yield the same dependence of entropy on time, namely, an initial scaling larger than ordinary scaling, and a sequel of weak oscillations, which are a clear signature of the external perturbation, in both cases. This is a clear indication of the fluctuation-periodicity correlation.Source: Physica. A (Print) 371 (2006): 157–170. doi:10.1016/j.physa.2006.04.054
DOI: 10.1016/j.physa.2006.04.054
Metrics:

See at: Physica A Statistical Mechanics and its Applications Restricted | www.sciencedirect.com | CNR ExploRA

2012 Journal article Restricted

Diffusion Scaling in event-driven random walks: an application to turbulence
Paradisi P., Cesari R., Donateo A., Contini D., Allegrini P.
Scaling laws for the diffusion generated by three different random walk models are reviewed. The random walks, defined on a one-dimensional lattice, are driven by renewal intermittent events with non-Poisson statistics and inverse power-law tail in the distribution of the inter-event or waiting times, so that the event sequences are characterized by self-similarity. Intermittency is a ubiquitous phenomenon in many complex systems and the power exponent of the waiting time distribution, denoted as complexity index, is a crucial parameter characterizing the system's complexity. It is shown that different scaling exponents emerge from the different random walks, even if the self-similarity, i.e. the complexity index, of the underlying event sequence remains the same. The direct evaluation of the complexity index from the time distribution is affected by the presence of added noise and secondary or spurious events. It is possible to minimize the effect of spurious events by exploiting the scaling relationships of the random walk models. This allows to get a reliable estimation of the complexity index and, at the same time, a confirmation of the renewal assumption. An application to turbulence data is shown to explain the basic ideas of this approach.Source: Reports on mathematical physics 70 (2012): 205–220. doi:10.1016/S0034-4877(12)60040-8
DOI: 10.1016/s0034-4877(12)60040-8
Metrics:

See at: Reports on Mathematical Physics Restricted | www.sciencedirect.com | CNR ExploRA

2011 Journal article Open Access

Noisy cooperative intermittent processes: From blinking quantum dots to human consciousness
Allegrini P., Paradisi P., Menicucci D., Bedini R., Gemignani A., Fronzoni L.
We study the superposition of a non-Poisson renewal process with the presence of a superimposed Poisson noise. The non-Poisson renewals mark the passage between meta- stable states in system with self-organization. We propose methods to measure the amount of information due to the two independent processes independently, and we see that a supercial study based on the survival probabilities yield stretched-exponential relaxations. Our method is in fact able to unravel the inverse-power law relaxation of the isolated non-Poisson processes, even when noise is present. We provide examples of this behavior in system of diverse nature, from blinking nano-crystals to weak turbulence. Finally we focus our discussion on events extracted from human electroencephalograms, and we discuss their connection with emerging properties of integrated neural dynamics, i.e. consciousness.Source: Journal of physics. Conference series (Print) 306 (2011). doi:10.1088/1742-6596/306/1/012027
DOI: 10.1088/1742-6596/306/1/012027
Metrics:

See at: Journal of Physics : Conference Series Open Access | iopscience.iop.org | ISTI Repository | CNR ExploRA

2006 Journal article Open Access

Renewal, modulation, and superstatistics in times series
Paolo Allegrini, Francesco Barbi, Paolo Grigolini, Paolo Paradisi
We consider two different approaches, to which we refer to as renewal and modulation, to generate time series with a nonexponential distribution of waiting times. We show that different time series with the same waiting time distribution are not necessarily statistically equivalent, and might generate different physical properties. Renewal generates aging and anomalous scaling, while modulation yields no significant aging and either ordinary or anomalous diffusion, according to the dynamic prescription adopted. We show, in fact, that the physical realization of modulation generates two classes of events. The events of the first class are determined by the persistent use of the same exponential time scale for an extended lapse of time, and consequently are numerous; the events of the second class are identified with the abrupt changes from one to another exponential prescription, and consequently are rare. The events of the second class, although rare, determine the scaling of the diffusion process, and for this reason we term them as crucial events. According to the prescription adopted to produce modulation, the distribution density of the time distances between two consecutive crucial events might have, or not, a diverging second moment. In the former case the resulting diffusion process, although going through a transition regime very extended in time, will eventually become anomalous. In conclusion, modulation rather than ruling out the action of renewal events, produces crucial events hidden by clouds of exponential events, thereby setting the challenge for their identification.Source: Physical review. E, Statistical, nonlinear and soft matter physics (Online) 73 (2006): 046136-1–046136-13. doi:10.1103/PhysRevE.73.046136
DOI: 10.1103/physreve.73.046136
Metrics:

See at: Physical Review E Open Access | pre.aps.org | Physical Review E Restricted | CNR ExploRA