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Search Results: 1 - 10 of 6273 matches for " Matteo Rossi "
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Una webfarm per AZALAI
Matteo Boschini,Paola Rossi
Bollettino del CILEA , 2003, DOI: 10.1472/bc.v87iaprile.806
Abstract: Il software Azalai, il MetaOPAC realizzato dal CILEA, ha trovato varie applicazioni: dal MAI, il MetaOPAC Azalai Italiano, ai sistemi MetaOPAC specializzati di settore, come MAIA, per l'architettura, e MAL, MetaOPAC della Regione Lombardia per le biblioteche pubbliche. Questi servizi hanno visto crescere l'utenza nel corso di questi ultimi anni, come pure le applicazioni create sono per loro natura in continua crescita in quanto collegano un numero sempre crescente di sistemi OPAC. Si è resa così evidente la crescita costante delle risorse necessarie per questi sistemi. Una soluzione adatta che è stata recentemente messa in opera è la webfarm.
Systemic value and corporate governance. Exploring the case of professional football teams.
Arturo Capasso,Matteo Rossi
Business Systems Review , 2013, DOI: 10.7350/bsr.v11.2013
Abstract: This paper aims to analyze how systemic thinking might contribute to investigate the interaction between company internal organization, financial structure and corporate governance. We focus our analysis on professional football teams as this special business combination provides an evident example of companies whose performance cannot be evaluated considering only financial returns or shareholder value. The investments of a professional football team are mainly in intangible resources, first and foremost in the skills and the competences of players, coaches, the general manager, and the medical staff. At the same time, the final outcome will include, both financial income, and intangible assets, like experience, popularity, reputation. The latter will pertain not only to the shareholders but to all the professionals involved, who will benefit of a higher market value for their services. Furthermore the supporters are an important component of the firm’s value too, because a substantial portion of future cashflows depends on the presence of a loyal customer base, whose claims cannot be disregarded without consequences on the economic value created by the organization. The traditional economic approach, correlating residual claimants with residual control rights and therein corporate governance, cannot be applied in presence of residual claimants who are different from shareholders. A professional football team strategy requires a multi-constituency systemic approach to be effectively implemented and to correctly evaluate its performances. Nowadays football is a business and several professional football teams are listed companies. Nonetheless many of them are experiencing financial losses, high debt and difficulties in funding their investments. Are these symptoms of a failure in creating economic value? Financial statements only give a true and fair assessment of value reporting assets and liabilities at their historical value, but where is the real value? How can we reliably assess the economic value of a football team? And who really owns those intangible assets that represent the largest fraction of its economic value? Moving from these considerations, can we reasonably imagine that a good corporate governance model should take into account only shareholders’ interests? According to our conclusions this is not the case, not only for professional football teams but also for many other businesses whose underlying logic cannot be understood without the lens of a systemic approach.
Multi-Stratum Networks: toward a unified model of on-line identities
Matteo Magnani,Luca Rossi
Computer Science , 2012,
Abstract: One of the reasons behind the success of Social Network Analysis is its simple and general graph model made of nodes (representing individuals) and ties. However, when we focus on our daily on-line experience we must confront a more complex scenario: people inhabitate several on-line spaces interacting to several communities active on various technological infrastructures like Twitter, Facebook, YouTube or FourSquare and with distinct social objectives. This constitutes a complex network of interconnected networks where users' identities are spread and where information propagates navigating through different communities and social platforms. In this article we introduce a model for this layered scenario that we call multi-stratum network. Through a theoretical discussion and the analysis of real-world data we show how not only focusing on a single network may provide a very partial understanding of the role of its users, but also that considering all the networks separately may not reveal the information contained in the whole multi-stratum model.
Towards effective visual analytics on multiplex and multilayer networks
Matteo Magnani,Luca Rossi
Computer Science , 2015,
Abstract: In this article we discuss visualisation strategies for multiplex networks. Since Moreno's early works on network analysis, visualisation has been one of the main ways to understand networks thanks to its ability to summarise a complex structure into a single representation highlighting multiple properties of the data. However, despite the large renewed interest in the analysis of multiplex networks, no study has proposed specialised visualisation approaches for this context and traditional methods are typically applied instead. In this paper we initiate a critical and structured discussion of this topic, and claim that the development of specific visualisation methods for multiplex networks will be one of the main drivers pushing current research results into daily practice.
Practical Automated Partial Verification of Multi-Paradigm Real-Time Models
Carlo A. Furia,Matteo Pradella,Matteo Rossi
Computer Science , 2008, DOI: 10.1007/978-3-540-88194-0_19
Abstract: This article introduces a fully automated verification technique that permits to analyze real-time systems described using a continuous notion of time and a mixture of operational (i.e., automata-based) and descriptive (i.e., logic-based) formalisms. The technique relies on the reduction, under reasonable assumptions, of the continuous-time verification problem to its discrete-time counterpart. This reconciles in a viable and effective way the dense/discrete and operational/descriptive dichotomies that are often encountered in practice when it comes to specifying and analyzing complex critical systems. The article investigates the applicability of the technique through a significant example centered on a communication protocol. More precisely, concurrent runs of the protocol are formalized by parallel instances of a Timed Automaton, while the synchronization rules between these instances are specified through Metric Temporal Logic formulas, thus creating a multi-paradigm model. Verification tests run on this model using a bounded validity checker implementing the technique show consistent results and interesting performances.
A Theory of Sampling for Continuous-time Metric Temporal Logic
Carlo A. Furia,Matteo Rossi
Computer Science , 2009, DOI: 10.1145/1838552.1838560
Abstract: This paper revisits the classical notion of sampling in the setting of real-time temporal logics for the modeling and analysis of systems. The relationship between the satisfiability of Metric Temporal Logic (MTL) formulas over continuous-time models and over discrete-time models is studied. It is shown to what extent discrete-time sequences obtained by sampling continuous-time signals capture the semantics of MTL formulas over the two time domains. The main results apply to "flat" formulas that do not nest temporal operators and can be applied to the problem of reducing the verification problem for MTL over continuous-time models to the same problem over discrete-time, resulting in an automated partial practically-efficient discretization technique.
Non-Markovian dynamics of single- and two-qubit systems interacting with Gaussian and non-Gaussian fluctuating transverse environments
Matteo A. C. Rossi,Matteo G. A. Paris
Physics , 2015,
Abstract: We address the interaction of single- and two-qubit systems with external fluctuating transverse fields and analyze in details the dynamical decoherence induced by Gaussian and non-Gaussian noise, e.g. random telegraph noise (RTN). Upon exploiting the exact RTN solution of the time-dependent Von Neumann equation, we analyze in details the behavior of quantum correlations and prove the non-Markovianity of the dynamical map in the full parameter range, i.e. for either fast or slow noise. The dynamics induced by Gaussian noise is studied numerically and compared to the RTN solution, showing the existence of (state dependent) regions of the parameter space where the two noises lead to very similar dynamics. Our results shows that while the effects of non-Gaussian noise cannot be trivially mapped to that of Gaussian noise and viceversa, i.e. the spectrum alone is not enough to summarize the noise effects, the dynamics under the effect of one kind of noise may be simulated with high fidelity by the other one.
Integrated Modeling and Verification of Real-Time Systems through Multiple Paradigms
Marcello M. Bersani,Carlo A. Furia,Matteo Pradella,Matteo Rossi
Computer Science , 2009, DOI: 10.1109/SEFM.2009.16
Abstract: Complex systems typically have many different parts and facets, with different characteristics. In a multi-paradigm approach to modeling, formalisms with different natures are used in combination to describe complementary parts and aspects of the system. This can have a beneficial impact on the modeling activity, as different paradigms an be better suited to describe different aspects of the system. While each paradigm provides a different view on the many facets of the system, it is of paramount importance that a coherent comprehensive model emerges from the combination of the various partial descriptions. In this paper we present a technique to model different aspects of the same system with different formalisms, while keeping the various models tightly integrated with one another. In addition, our approach leverages the flexibility provided by a bounded satisfiability checker to encode the verification problem of the integrated model in the propositional satisfiability (SAT) problem; this allows users to carry out formal verification activities both on the whole model and on parts thereof. The effectiveness of the approach is illustrated through the example of a monitoring system.
Autism and classification systems: a study of 84 children
Matteo Chiappedi, Giorgio Rossi, Maura Rossi, Maurizio Bejor, Umberto Balottin
Italian Journal of Pediatrics , 2010, DOI: 10.1186/1824-7288-36-10
Abstract: We tried to classify them according to ICD 10, DSM IV TR, CFTMEA-R, "operational classification" (Manzano and Palacio) and de Ajuriaguerra's classification.We found a good correspondence between DSM IV TR and ICD 10 and the use of psychodynamic classification systems (in particular CFTMEA-R) was useful to differentiate clinical subtypes collected under the PDD NOS etiquette according to DSM IV TR.To rationalize research efforts and find better tailored therapies, we need to improve PDD classification systems, using contributions coming from every field of child psychiatry and neurology: it's possible that 0-3 Classification could help this.A number of studies have shown that current classification systems (ICD 10 [1], DSM IV TR [2]) have limitations when applied to children with Autism Spectrum Disorders. According to Cohen and Volkmar [3] classification systems should aim at improving communication, through their features (internal consistency, use easiness, good definition of categories) and being widely accepted. Cantwell [4] underlines that a classification system should provide a description unifying clinical, biochemical, genetical, neurophysiological and neuroimaging findings to identify specific categories with a unique natural history, prognosis and (if possible) therapy. This system should also be logical and easy to use in clinical settings. The term Autism Spectrum Disorders comes from the theoretical work of many Authors and includes a continuum moving from the "classical" autism described by Kanner, to Asperger's syndrome, to autistic-like forms and even to autistic traits in mental retardation [5].Phenomenological polymorphism and a natural course not moving towards "normality" are among the main factors which make it difficult to reach a shared classification system. After the important contributions by Rutter and Ritvo, DSM III was the first system to use the Pervasive Developmental Disorders (PDD) category, which meant to be an a-theoretical defini
Cortico-Cortical Connectivity between Right Parietal and Bilateral Primary Motor Cortices during Imagined and Observed Actions: A Combined TMS/tDCS Study
Matteo Feurra,Nicola R. Polizzotto,Simone Rossi
Frontiers in Neural Circuits , 2011, DOI: 10.3389/fncir.2011.00010
Abstract: Previous transcranial magnetic stimulation (TMS) studies showed functional connections between the parietal cortex (PC) and the primary motor cortex (M1) during tasks of different reaching-to-grasp movements. Here, we tested whether the same network is involved in cognitive processes such as imagined or observed actions. Single pulse TMS of the right and left M1 during rest and during a motor imagery and an action observation task (i.e., an index–thumb pinch grip in both cases) was used to measure corticospinal excitability changes before and after conditioning of the right PC by 10 min of cathodal, anodal, or sham transcranial direct current stimulation (tDCS). Corticospinal excitability was indexed by the size of motor-evoked potentials (MEPs) from the contralateral first dorsal interosseous (FDI; target) and abductor digiti minimi muscle (control) muscles. Results showed selective ipsilateral effects on the M1 excitability, exclusively for motor imagery processes: anodal tDCS enhanced the MEPs’ size from the FDI muscle, whereas cathodal tDCS decreased it. Only cathodal tDCS impacted corticospinal facilitation induced by action observation. Sham stimulation was always uneffective. These results suggest that motor imagery, differently from action observation, is sustained by a strictly ipsilateral parieto-motor cortex circuits. Results might have implication for neuromodulatory rehabilitative purposes.
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