11,524 research outputs found
De Cifris Cryptanalysis: selected papers from the ITASEC2020 workshop "Cryptanalysis: a key tool in securing and breaking ciphers"
No full textSelected papers from the ITASEC2020 workshop "Cryptanalysis: a key tool in securing and breaking ciphers
The bisymplectomorphism group of a bounded symmetric domain
No full textIn a previous paper with A. Loi we introduced the so called symplectic duality between Hermitian symmetric spaces. Such duality consists in a bysimplectomorphism between an open and dense subset of a compact Hermitian symmetric space and its non-compact dual. The question about how many dualities does exists is directly related to the group of bi-symplectomorphism of a bounded symmetric domain of the complex euclidean space. In this paper we give a precise description of such group showing that its is a product of the isotropy group times the set of smooth function of the interval [0,1) to S^1. We study the group of bi-symplectomorphism of a bounded symmetric domai
La vittoria di Andrea Chénier
No full textRecensione allo spettacolo Andrea Chénier di Umberto Giordano (Teatro alla Scala, dicembre 2017).Review at Andrea Chénier by Umberto Giordano (Teatro alla Scala, December 2017)
Temporal Planning with Temporal Metric Trajectory Constraints
No full textIn several industrial applications of planning, complex temporal
metric trajectory constraints are needed to adequately
model the problem at hand. For example, in production
plants, items must be processed following a “recipe” of steps
subject to precise timing constraints. Modeling such domains
is very challenging in existing action-based languages due to
the lack of sufficiently expressive trajectory constraints.
We propose a novel temporal planning formalism allowing
quantified temporal constraints over execution timing of action
instances. We build on top of instantaneous actions borrowed
from classical planning and add expressive temporal
constructs. The paper details the semantics of our new formalism
and presents a solving technique grounded in classical,
heuristic forward search planning. Our experiments prove
the proposed framework superior to alternative state-of-theart
planning approaches on industrial benchmarks, and competitive
with similar solving methods on well known benchmarks
took from the planning competition
LA QUALITÀ DELL’INTERVENTO SUI BENI CULTURALI ATTUALITÀ, PROBLEMI E PROSPETTIVE
No full textThe federation of models is a pillar of the BIM approach: it allows to keep the contents
of each discipline separate during the modelling-creation phase, and to merge
them together later during the project management phase, from its feasibility to the
construction site, to the management of the entire life-cycle of the building. Generally,
these models refer to specific disciplines and the architectural, plant and structural
model are always identified. When the asset belongs to Cultural Heritage, more
generically an existing building, the BIM approach is faced with an additional level
of complexity since it is necessary to model something existing and of which not
much information is known. The geometric complexity of the asset often aggravates
this situation because if the parametric modelling is preferred, it is difficult to represent
such irregular morphologies, and if the surface modelling and a more geometrical
detail is preferred, the model becomes very heavy. In many cases the choice is
to approximate reality as best as possible through specific and tailor-made modelling
approaches, often complex and with some borderline methods, if compared to BIM
logic. In other cases it makes sense to define when the geometric complexity and the
reliability of the model are necessary, and when, instead, a simplification is required
to effectively manage the information. The case study presented is the Arch of Augustus,
in Aosta, for the HBIM approach it has been chosen to separate the two approaches,
placing side by side the federated models referred to the classical disciplines
with two models of the current state: one very accurate with the purpose of
maintaining all the quality of acquired 3D geometric information, while the other
schematic, necessary as a 3D index for the information. However, the approach
described here requires a preliminary reflection to define the BIM granularity
and to define the methodological procedures that allow the bidirectional relationship
between survey model and conceptual model
NEWPERS PECTIVES FOR MAPPING ALTERATIONS IN HBIMIN CONSERVATION PROJECTS
No full textHistoric Building Information Modelling (HBIM) finds one of its most interesting applications in conservation design. The HBIMapproachdid not originate as a simple data archive method but as an information tool to help the designer at all stages of the building process. Turning to the field of preservation, a lot of information about the building is represented by thematic maps. They makeit possible to get a graphic representation of the state of conservation of a facade or to understand the structural situation of a building. This research, experimented on the Arch of Augustus in Aosta, starts from the large amount of data acquired by the RAVA Laboratory of the Superintendence of Aosta over a long period. These data allowed for testing different approaches to thematic mapping, depending on the specific themes to be represented. In any case, even this experimentation required theoretical reasoning that preceded the operational phases. The question, which this article wants only to start to address, concerns the role of thematic mappings in the preservation project carried out with an HBIM approach, their necessity, and their implementation towards truly threedimensional data, which therefore maintains all the information that is directly acquired in three dimensions
NEW PERSPECTIVES FOR MAPPING ALTERATIONS IN HBIM IN CONSERVATION PROJECTS
No full textHistoric Building Information Modelling
(HBIM) finds one of its most interesting
applications in conservation design.
The HBIM approach did not originate as a
simple data archive method but as an
information tool to help the designer at all
stages of the building process. Turning to the
field of preservation, a lot of information about
the building is represented by thematic maps.
They make it possible to get a graphic
representation of the state of conservation of a
facade or to understand the structural situation
of a building.
This research, experimented on the Arch of
Augustus in Aosta, starts from the large amount
of data acquired by the RAVA Laboratory of the
Superintendence of Aosta over a long period.
These data allowed for testing different
approaches to thematic mapping, depending on
the specific themes to be represented.
In any case, even this experimentation required
theoretical reasoning that preceded the
operational phases.
The question, which this article wants only to
start to address, concerns the role of thematic
mappings in the preservation project carried
out with an HBIM approach, their necessity, and
their implementation towards truly threedimensional data, which therefore maintains all
the information that is directly acquired in
three dimensions
A Network Analysis of Countries’ Export Flows: Firm Grounds for the Building Blocks of the Economy
No full textIn this paper we analyze the bipartite network of countries and products from UN data on country production. We define the country-country and product-product projected networks and introduce a novel method of filtering information based on elements’ similarity. As a result we find that country clustering reveals unexpected socio-geographic links among the most competing countries. On the same footings the products clustering can be efficiently used for a bottom-up classification of produced goods. Furthermore we mathematically reformulate the “reflections method” introduced by Hidalgo and Hausmann as a fixpoint problem; such formulation highlights some conceptual weaknesses of the approach. To overcome such an issue, we introduce an alternative methodology (based on biased Markov chains) that allows to rank countries in a conceptually consistent way. Our analysis uncovers a strong non-linear interaction between the diversification of a country and the ubiquity of its products, thus suggesting the possible need of moving towards more efficient and direct non-linear fixpoint algorithms to rank countries and products in the global market.</p
Symplectic duality of Symmetric Spaces
No full textWe show that between symmetric spaces of different types there exists a bi-symplectic map. We compute the duality map explicitely by using the theory of Jordan Algebra
- …
