1,381 research outputs found
Multi-key and Multi-input Predicate Encryption (for Conjunctions) from Learning with Errors
No full textWe put forward two natural generalizations of predicate encryption (PE), dubbed multi-key and multi-input PE. More in details, our contributions are threefold. Definitions. We formalize security of multi-key PE and multi-input PE following the standard indistinguishability paradigm, and modeling security both against malicious senders (i.e., corruption of encryption keys) and malicious receivers (i.e., collusions). Constructions. We construct adaptively secure multi-key and multi-input PE supporting the conjunction of poly-many arbitrary single-input predicates, assuming the sub-exponential hardness of the learning with errors (LWE) problem. Applications. We show that multi-key and multi-input PE for expressive enough predicates suffices for interesting cryptographic applications, including non-interactive multi-party computation (NI-MPC) and matchmaking encryption (ME). In particular, plugging in our constructions of multi-key and multi-input PE, under the sub-exponential LWE assumption, we obtain the first ME supporting arbitrary policies with unbounded collusions, as well as robust (resp. non-robust) NI-MPC for so-called all-or-nothing functions satisfying a non-trivial notion of reusability and supporting a constant (resp. polynomial) number of parties. Prior to our work, both of these applications required much heavier tools such as indistinguishability obfuscation or compact functional encryption
New challenges of geriatric cardiology: From clinical to preclinical research
No full textThe field of geriatric cardiology reflects the evolving medical approaches tailored to address the needs of the growing population of oldest old with cardiovascular diseases (CVD). The burden of CVD is expected to increase particularly for the most common types of chronic heart disease of the elderly including coronary artery disease, heart failure and atrial fibrillation. In this context of dramatic demographic changes, geriatric cardiologists are facing important challenges. In this review, we outline the basic concepts of geriatric cardiology and describe these challenges as well as the unmet needs around this discipline with also a focus on the translation from basic research
Progettazione sismica di tipo prestazionale: l’importanza della scelta dell’input sismico
No full textL’obiettivo principale del Performance Based Seismic Design (PBSD) consiste nella stima probabilistica delle prestazioni di una struttura soggetta all’azione sismica (PSDHA). Questa memoria concerne, in particolare, le procedure atte ad una corretta identificazione degli input dinamici da utilizzarsi in questo tipo di analisi. In dettaglio, (a) viene proposto un quadro generale per una trattazione organizzata e razionale degli ultimi contributi di ricerca finalizzati ad una corretta identificazione degli inputs sismici e (b) viene formulata una proposta per l’utilizzo di un parametro di tipo vettoriale identificativo dei sismi di progetto, composto da Peak Ground Acceleration (PGA) e Peak Ground Velocity (PGV). Vengono inoltre elaborati gli spettri di risposta (di accelerazione e di spostamento, sia elastico lineari che elasto-plastici) ottenuti a partire da gruppi di sismi identificati con la metodologia proposta e confrontati con gli spettri ottenuti da gruppi di sismi identificati in base alla sola PGA (o PGV), come indicato dalle normative vigenti
Displacement-based seismic design and analysis of different configurations of RC frames
No full textThe object of this paper is the evaluation of the seismic response of reinforced concrete frames designed according to the Direct Displacement-Based Design (DDBD) approach. The design was carried out following procedures and regulations included in the Model Code recently proposed for the application of this methodology. The displacement-based approach was investigated considering a set of RC frames characterized by nine storeys and different configurations. In particular the following configurations were studied: regular in elevation, characterized by a setback at the upper storeys and irregular in elevation with a soft storey. The methodology was applied together with a simplified procedure based on equilibrium conditions for determining design member forces. The seismic behaviour of the designed frames was studied by performing pushover and non-linear dynamic analyses on the basis of a fibre model of the structures. A group of earthquake records compatible with design displacement spectrum was selected for the non-linear dynamic analyses. The results of analyses were compared with the seismic behaviour expected from design in order to evaluate the effectiveness of the procedure with particular attention to the different examined configurations
On the design and evaluation of seismic response of RC buildings according to direct displacement-based design approach
No full textThis paper describes a research work on the evaluation of seismic response of reinforced concrete frames designed according to Direct Displacement-Based Design (DDBD) approach. A group of plane RC frames, characterized by a variable number of storeys, was designed by means of this methodology. Then, seismic performance of designed frames was studied by carrying out pushover and non-linear dynamic analyses. Results of analyses were compared with the seismic behavior expected from design. Some evaluations are also made on the differences between DDBD and more traditional force-based design procedures
Landscape management as a «sustainable agriculture» tool: the role of local administration and research in the Emilia-Romagna region (northern Italy)
No full textPerspettiva ridotta a perfezione: Glimpses of Daniele Barbaro’s Perspective Theory
No full textThis contribution is intended to identify some textual elements, apparently
secondary in Daniele Barbaro’s treatise on perspective, which either foreshadow
unprecedented developments in the discipline of representation or have
constituted complex critical nodes in the field of perspective. The first of these
is introduced in part V: anamorphosis (though never so called by the author, since
the term was not yet in use), suggesting a quick method to deform any flat image
by means of shadows. Finally, the author mentions two other ‘eccentric’ elements
of interest for the future developments of perspective that originated in Daniele
Barbaro’s text: an optical-projective device first introduced by Giovanni Battista
Vimercato, later developed by Jean François Niceron in his Thaumaturgus
opticus (1646), and the camera obscura
INTRUSION AND PRESENCE OF THE AUTHOR IN SAMUEL BECKETT’S “THE UNNAMABLE” AND B. S. JOHNSON’S “ALBERT ANGELO”
No full textThis article explores the intricate relationship between B.S. Johnson’s novel “Albert Angelo” and Beckett’s “The Unnamable”, both dealing with the issue of the possible presence of the author in his own text. The point of departure for such comparison is Johnson’s incorporation, as an epigraph, of a passage taken from Beckett’s novel. Such passage, intended rather literally by the British author, is employed as a justification not only for the central device at the heart of his novel, but also in support of a larger aesthetic project which will characterise a great part of his oeuvre – which famously stresses the importance of ‘truth’, as opposed to fabulation, and the necessity of the author’s direct presence in his texts. This contribution, in particular, tries to reconstruct the history of Johnson’s involvement with Beckett’s work, demonstrating how Johnson has in fact distorted the master’s message – perhaps intentionally – in order to produce a rather different model of literature, despite moving from very similar premises
METHODOLOGY FOR EPI GROUP CREATION
No full textThis paper presents a comprehensive methodology for the identification of groups (bins) of earthquake time history inputs associated to a specific hazard level (“EPI groups”, as defined hereafter by the authors) to be used in the Probabilistic Seismic Demand Hazard Analysis (PSDHA) subtask of the Performance Based Seismic Design (PBSD) procedure. The formulation of a rationally-organised framework for input selection is necessary to optimise the process and improve the exchange of pieces of information between structural engineers and seismologists. The paper also presents an applicative example of the proposed methodology as developed for selected earthquake design levels and a specific site in Italy
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