170,260 research outputs found
Fitting a Statistical Model to SIR-C SAR images of the Sea Surface
No full textA suite of statistical procedures aimed at assessing to what extent polarimetric and/or multifrequency synthetic aperture radar (SAR) images of the sea surface can be modeled in terms of spherically invariant random vectors and matrices (SIRVs and SIRMs) is presented. The proposed tests assume that images can be described by resorting to the compound-Gaussian model, but do not require any a priori knowledge about the actual first-order probability density function (pdf) of the texture. The tests have also been used to analyze three data sets from STR-C/X-SAR missions
Improving Interoperability in Multi-domain Enterprise Right Management Applications
No full textIn this paper we consider the problem of protecting files, possibly stored using remote storage services, on a device running different and independent third party applications. We present a general architecture that, by exploiting the inherent security of Trusted Execution Environments, and by requiring minimal secure storage onboard the device, is able to provide a general purpose, distributed storage system that allows the cooperation among different applications domains. Our system exposes APIs that can be invoked by other trusted applications, using the standard TEE IPC. Furthermore, we discuss a middleware that allows legacy applications to transparently access secured files
Special Issue on 13th International Conference on Security and Cryptography for Networks (SCN 2022)
No full textSecure Firmware Update: Challenges and Solutions
No full textThe pervasiveness of IoT and embedded devices allows the deployment of services that were unthinkable only few years ago. Such devices are typically small, run unattended, possibly on batteries and need to have a low cost of production. As all software systems, this type of devices need to be updated for different reasons, e.g., introducing new features, improving/correcting existing functionalities or fixing security flaws. At the same time, because of their low-complexity, standard software distribution platforms and techniques cannot be used to update the software. In this paper we review the current limitations posed to software distribution systems for embedded/IoT devices, consider challenges that the researchers in this area have been identifying and propose the corresponding solutions
Automatic Face Image Tagging in Large Collections.
No full textIn this chapter, the authors present some issues related to automatic face image tagging techniques. Their main purpose in user applications is to support the organization (indexing) and retrieval (or easy browsing) of images or videos in large collections. Their core modules include algorithms and strategies for handling very large face databases, mostly acquired in real conditions. As a background for understanding how automatic face tagging works, an overview about face recognition techniques is given, including both traditional approaches and novel proposed techniques for face recognition in uncontrolled settings. Moreover, some applications and the way they work are summarized, in order to depict the state of the art in this area of face recognition research. Actually, many of them are used to tag faces and to organize photo albums with respect to the person(s) presented in annotated photos. This kind of activity has recently expanded from personal devices to social networks, and can also significantly support more demanding tasks, such as automatic handling of large editorial collections for magazine publishing and archiving. Finally, a number of approaches to large-scale face datasets as well as some automatic face image tagging techniques are presented and compared. The authors show that many approaches, both in commercial and research applications, still provide only a semi-automatic solution for this problem
Stability of equilibria and bifurcations for a fluid-solid interaction problem
No full textWe study certain significant properties of the equilibrium configurations of a rigid body subject to an undamped elastic restoring force, in the stream of a viscous liquid in an unbounded 3D domain. The motion of the coupled system is driven by a uniform flow at spatial infinity, with constant dimensionless velocity lambda. We show that if lambda is below a critical value, lambda(c )(say), there is a unique and stable time-independent configuration, where the body is in equilibrium and the flow is steady. We also prove that, if lambda < lambda(c) , no oscillatory flow may occur. Successively, we investigate possible loss of uniqueness by providing necessary and sufficient conditions for the occurrence of a steady bifurcation at some lambda(s) >= lambda (c) . (c) 2024 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons .org /licenses /by -nc -nd /4 .0/)
INCOSTITUZIONALITÀ DELLA PREVISIONE DI LINEE GUIDA REGIONALI IN TEMA DI ACQUISIZIONE AL PATRIMONIO COMUNALE DI IMMOBILI ABUSIVI E LIMITI DELLE LEGGI PROVVEDIMENTO. UN COMMENTO A PRIMA LETTURA DI C. COST., 5 LUGLIO 2018, N. 140
No full textLa Consulta dichiara incostituzionale una disposizione della l. reg. Campania n. 19/2017 (art. 2, c. 2), che prevede l’adozione da parte della Giunta di linee guida non vincolanti rivolte ai Comuni in tema di acquisizione (e conservazione) al patrimonio comunale di immobili abusivi, ai sensi dell’art. 31, c. 5, del d.P.R. n. 380/2001, per contrasto con principi fondamentali della legislazione dello Stato nella materia “governo del territorio”: il Comune resta arbitro, con ragionevolezza e proporzionalità, del mantenimento degli immobili abusivi sul proprio territorio, per fare fronte a “prevalenti interessi pubblici”. Si coglie, così, un nuovo limite della legge provvedimento: essa non potrà disporre in modo da predeterminare ex lege l’interesse pubblico concreto, sia pure attraverso soft law, esimendo la pubblica amministrazione dalla responsabilità di qualificare il pubblico interesse in modo imparziale.The Italian Constitutional Court declares unconstitutional a provision of the region Campania law n. 19/2017 (article 2 , second paragraph), foreseeing the adoption by the Council of non-binding guidelines addressed Municipalities on acquisition (and preservation) to communal heritage of unauthorised buildings, under Article 31,5th paragraph, d.P.R. n. 380/2001, contrary to the fundamental principles of the law of the State in the field of “ territory governance” : the City Council remains the sole master, with common sense and proportionality, of unauthorised buildings maintenance on its territory, in order to face overriding public interest. We are taking, thus, a new limit in the legislative measure : it won’t be able to legislate in order to predetermine ex lege the real public interest albeit with a soft law, exempting the public administration from the responsability to classify impartially the public interest
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