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Search Results: 1 - 10 of 1993 matches for " Fabrizio Patriarca "
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Tax Compliance, Income Distribution and Social Norms  [PDF]
Debora Di Gioacchino, Fabrizio Patriarca
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.73044
Abstract: This paper studies the effect of income inequality on tax evasion. To discuss the topic, we present a simple model, based on Benabouand Tirole [1], that incorporates incentives for tax compliance such as punishment and fines, intrinsic motivation and social norms. Since we consider a regressive system of incentives to comply, income inequality increases the value of tax evasion although overall propensity to comply is unaffected. In this framework, we consider the hypothesis that social norms are group specific as in the case of social segregation or status related networks. We show that all the negative effects of inequalities are amplified: the difference between the tax compliance of the income groups and the value of tax evasion increase.
Thermal Reservoir coupled to External Field and Quantum Dissipation
Fabrizio Illuminati,Marco Patriarca
Physics , 1992,
Abstract: In the framework of the Caldeira-Leggett model of dissipative quantum mechanics, we investigate the effects of the interaction of the thermal reservoir with an external field. In particular, we discuss how the interaction modifies the conservative dynamics of the central particle, and the mechanism of dissipation. We briefly comment on possible observable consequencies.
?Diário? de Leal Marques sobre a forma??o do primeiro governo de Salazar
Análise Social , 2006,
Abstract: the ?diary? of leal marques on the formation of salazar?s first government
The bats of the Lake Maggiore Piedmont shore (NW Italy)
Paolo Debernardi,Elena Patriarca
Hystrix : the Italian Journal of Mammalogy , 2007, DOI: 10.4404/hystrix-18.1-4390
Influence of geography on language competition
Marco Patriarca,Els Heinsalu
Physics , 2008, DOI: 10.1016/j.physa.2008.09.034
Abstract: Competition between languages or cultural traits diffusing in the same geographical area is studied combining the language competition model of Abrams and Strogatz and a human dispersal model on an inhomogeneous substrate. Also, the effect of population growth is discussed. It is shown through numerical experiments that the final configuration of the surviving language can be strongly affected by geographical and historical factors. These factors are not related to the dynamics of culture transmission, but rather to initial population distributions as well as geographical boundaries and inhomogeneities, which modulate the diffusion process.
Variational principle for the Pareto power law
Anirban Chakraborti,Marco Patriarca
Physics , 2006,
Abstract: A mechanism is proposed for the appearance of power law distributions in various complex systems. It is shown that in a conservative mechanical system composed of subsystems with different numbers of degrees of freedom a robust power-law tail can appear in the equilibrium distribution of energy as a result of certain superpositions of the canonical equilibrium energy densities of the subsystems. The derivation only uses a variational principle based on the Boltzmann entropy, without assumptions outside the framework of canonical equilibrium statistical mechanics. Two examples are discussed, free diffusion on a complex network and a kinetic model of wealth exchange. The mechanism is illustrated in the general case through an exactly solvable mechanical model of a dimensionally heterogeneous system.
Kinetic exchange models: From molecular physics to social science
Marco Patriarca,Anirban Chakraborti
Quantitative Finance , 2013,
Abstract: We discuss several multi-agent models that have their origin in the kinetic exchange theory of statistical mechanics and have been recently applied to a variety of problems in the social sciences. This class of models can be easily adapted for simulations in areas other than physics, such as the modeling of income and wealth distributions in economics and opinion dynamics in sociology.
Gamma-distribution and wealth inequality
Anirban Chakraborti,Marco Patriarca
Quantitative Finance , 2008, DOI: 10.1007/s12043-008-0156-3
Abstract: We discuss the equivalence between kinetic wealth-exchange models, in which agents exchange wealth during trades, and mechanical models of particles, exchanging energy during collisions. The universality of the underlying dynamics is shown both through a variational approach based on the minimization of the Boltzmann entropy and a complementary microscopic analysis of the collision dynamics of molecules in a gas. In various relevant cases the equilibrium distribution is the same for all these models, namely a gamma-distribution with suitably defined temperature and number of dimensions. This in turn allows one to quantify the inequalities observed in the wealth distributions and suggests that their origin should be traced back to very general underlying mechanisms: for instance, it follows that the smaller the fraction of the relevant quantity (e.g. wealth or energy) that agents can exchange during an interaction, the closer the corresponding equilibrium distribution is to a fair distribution.
Kinetic models of immediate exchange
Els Heinsalu,Marco Patriarca
Quantitative Finance , 2015, DOI: 10.1140/epjb/e2014-50270-6
Abstract: We propose a novel kinetic exchange model differing from previous ones in two main aspects. First, the basic dynamics is modified in order to represent economies where immediate wealth exchanges are carried out, instead of reshufflings or uni-directional movements of wealth. Such dynamics produces wealth distributions that describe more faithfully real data at small values of wealth. Secondly, a general probabilistic trading criterion is introduced, so that two economic units can decide independently whether to trade or not depending on their profit. It is found that the type of the equilibrium wealth distribution is the same for a large class of trading criteria formulated in a symmetrical way with respect to the two interacting units. This establishes unexpected links between and provides a microscopic foundations of various kinetic exchange models in which the existence of a saving propensity is postulated. We also study the generalized heterogeneous version of the model in which units use different trading criteria and show that suitable sets of diversified parameter values with a moderate level of heterogeneity can reproduce realistic wealth distributions with a Pareto power law.
Accurate Tools for Analyzing the Behavior of Impulse Noise Reduction Filters in Color Images  [PDF]
Fabrizio Russo
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.41005

Effective cancellation of noise and preservation of color/structural information are features of paramount importance for any filter devoted to impulse noise removal in color images. In this paper novel full-reference tools for analyzing the behavior of this family of filters are presented. The proposed approach is based on the classification of color errors into two main classes that separately take into account the inaccuracy in removing noise pulses and the filtering distortion. The distortion errors are then classified into two subclasses for a deeper analysis of the filtering behavior. Computer simulations show that the proposed method gives more accurate results than using other measures of filtering performance in the literature. Furthermore, the method can easily yield the spatial location of the different filtering features in the image.

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