4,341 research outputs found
A Robustness Analysis to Structured Channel Tampering Over Secure-by-Design Consensus Networks
No full textThis letter addresses multi-agent consensus networks where adverse attackers affect the convergence performances of the protocol by manipulating the edge weights. We generalize (Fabris and Zelazo, 2022) and provide guarantees on the agents' agreement in the presence of attacks on multiple links in the network. A stability analysis is conducted to show the robustness to channel tampering in the scenario where part of the codeword, corresponding to the value of the edge weights, is corrupted. Exploiting the built-in objective coding, we show how to compensate the conservatism that may emerge because of multiple threats in exchange for higher encryption capabilities. Numerical examples related to semi-autonomous networks are provided
Insider and outsider views in early modern correspondence involving patrons and musicians
No full textIn this chapter Dinko Fabris proposes a reassessment of the heuristic value of correspondence in the light of a cognate-theory sensitivity toward the body of private letters preserved in the Archivio Bentivoglio, a complex type of historical source in demand of a respectful interpretation as a communicational device between past insiders, now in the hands of present outsiders; that is, those scholars aiming to reconstruct a past artistic and cultural milieu as a whole. For this purpose, the author draws on the distinction between “outsider” and “insider” made by cultural historians and moves within the framework of “urban musicology,” discussing the figure of Enzo Bentivoglio as a case study
Laughing Is Not an Exception! An Italian Perspective on the Autonomous Protection of Parodies Beyond Elaboration
No full textThis paper analyses the legal regime of parodistic work from an Italian and European copyright law perspective. Taking into consideration that the Italian Copyright Act does not contain any specific parody exception, the author maintains that parodistic works cannot fall within the scope of the quotation and criticism exception. Based on the fact that, as is well known, EU copyright law does not allow Member States and national courts to apply a general “fair use” doctrine to support the lawfulness of using another’s work for parodistic purposes, it is argued that the use of a previous work to create a new parodistic work falls beyond the scope of copyright protection, and that the creation and commercialisation of a parodistic work cannot be prohibited by the author of the parodied work, since the former does not amount to an elaboration of the latter
Secure Consensus via Objective Coding: Robustness Analysis to Channel Tampering
No full textThis work mainly addresses continuous-time multiagent consensus networks where an adverse attacker affects the convergence performances of said protocol. In particular, we develop a novel secure-by-design approach in which the presence of a network manager monitors the system and broadcasts encrypted tasks (i.e., hidden edge weight assignments) to the agents involved. Each agent is then expected to decode the received codeword containing data on the task through appropriate decoding functions by leveraging advanced security principles, such as objective coding and information localization. Within this framework, a stability analysis is conducted for showing the robustness to channel tampering in the scenario where part of the codeword corresponding to a single link in the system is corrupted. A tradeoff between objective coding capability and network robustness is also pointed out. To support these novelties, an application example on decentralized estimation is provided. Moreover, an investigation of the robust agreement is as well extended in the discrete-time domain. Further numerical simulations are given to validate the theoretical results in both the time domains
Bearing-based autonomous communication relay positioning under field-of-view constraints
No full textThis article investigates the problem of communication relay establishment for multiple agent-based mobile units using a relay vehicle. The objective is to drive autonomously the relay vehicle to attain a position for communication relay establishment while maintaining the other vehicles inside of its field-of-view. A bearing-based control law is proposed for the relay drone and designed for both single and multiple agents. We also provide a collision avoidance scheme that ensures no collisions between the relay and other agents. Numerical simulations and experimental results are reported as well to show the efficacy of the proposed approach
Singer Songwriters, the Lute, and the Stile nuovo
No full textItalian Soundscapes: Souvenirs from the Grand Tour, Dinko Fabris, Musical Encounters Public and Private, Margaret Murata, Singer-songwriters, the Lute, and the Stile Nuovo, John Griffiths, High, Middle, and Low: Singing Monteverdi, Richard ..
Constraints on unified models for dark matter and dark energy using H(z)
No full textFabris JC, de Oliveira PLC, Velten H. Constraints on unified models for dark matter and dark energy using H(z). European Physical Journal C. 2011;71(10): 1773.The differential age data of astrophysical objects that have evolved passively during the history of the universe (e. g. red galaxies) allows us to test theoretical cosmological models through the predicted Hubble function expressed in terms of the redshift z, H(z). We use the observational data for H(z) to test unified scenarios for dark matter and dark energy. Specifically, we focus our analysis on the Generalized Chaplygin Gas (GCG) and the viscous fluid (VF) models. For the GCG model, it is shown that the unified scenario for dark energy and dark matter requires some priors. For the VF model we obtain estimations for the free parameters, which may be compared with further analysis mainly at perturbative level
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