Conservation process model (cpm). A twofold scientific research scope in the information modelling for cultural heritage

The aim of the present research is to develop an instrument able to adequately support the conservation process by means of a twofold approach, based on both BIM environment and ontology formalisation. Although BIM has been successfully experimented within AEC (Architecture Engineering Construction) field, it has showed many drawbacks for architectural heritage. To cope with unicity and more generally complexity of ancient buildings, applications so far developed have shown to poorly adapt BIM to conservation design with unsatisfactory results (Dore, Murphy 2013; Carrara 2014). In order to combine achievements reached within AEC through BIM environment (design control and management) with an appropriate, semantically enriched and flexible The presented model has at its core a knowledge base developed through information ontologies and oriented around the formalization and computability of all the knowledge necessary for the full comprehension of the object of architectural heritage an its conservation. Such a knowledge representation is worked out upon conceptual categories defined above all within architectural criticism and conservation scope. The present paper aims at further extending the scope of conceptual modelling within cultural heritage conservation already formalized by the model. A special focus is directed on decay analysis and surfaces conservation project

Credit risk in pure jump structural models

Structural models of credit risk are known to present vanishing spreads at very short maturities. This shortcoming, which is due to the diffusive behavior assumed for asset values, can be circumvented by considering discontinuities of the jump type in their evolution over time. In particular, assuming a pure jump process. Moreover, when applied to market data diffusion-based structural models tend to produce too low spreads, even over longer horizons. In this paper we show that a jump process of the Variance-Gamma type for the asset value can also circumvent this practical shortcoming. We calibrate a terminal-default jump structural model to single-name data for the CDX NA IG and CDX NA HY components. We show that the VG model provides not only smaller errors, but also a better qualitative fit than other diffusive structural models. Indeed, it avoids both the spread underprediction of the classical Merton model and the excessive overpredictions of other well known diffusive models, as recently explored by Eom, Helwege, Huang (2004) or Demchuk and Gibson (2005).

The Liouville-Arnold-Nekhoroshev theorem for non-compact invariant manifolds

Under ceratin conditions, generalized action-angle coordinates can be introduced near non-compact invariant manifolds of completely and partially integrable Hamiltonian systems.Comment: 8 page

Single and joint default in a structural model with purely discontinuous assets

Structural models of credit risk are known to present both vanishing spreads at very short maturities and a poor spread fit over longer maturities. The former shortcoming, which is due to the diffusive behavior assumed for asset values, can be circumvented by considering discontinuous assets. In this paper we resort to a pure jump process of the Variance-Gamma type. First we calibrate the corresponding Merton type structural model to single-name data for the DJ CDX NA IG and CDX NA HY components. By so doing, we show that it circumvents also the diffusive structural models difficulties over longer horizons. In particular, it corrects for underprediction of low risk spreads and overprediction of high risk ones. Then we extend the model to joint default, resorting to a recent formulation of the VG multivariate model and without superimposing a copula choice. We fit default correlation for a sample of CDX NA names, using equity correlation. The main advantage of our joint model with respect to the existing non diffusive ones is that it allows calibration without the equicorrelation assumption, but still in a parsimonious way. As an example of the default assessments which the calibrated model can provide, we price a FtD swap.credit risk, structural models, Lévy asset prices, default probability, joint default.

Storia e geografia del restauro. Un’introduzione

Problematiche relative allo studio della storia e della geografia del restaur

The Dynamics and Economic Impact of the Cultural Event “La Notte Bianca Romana”

This paper analyzes the cultural and artistic event “La Notte Bianca Romana”, which has been designed and realized by the Municipality of Rome. It consists in a territorial marketing tool to promote the “Eternal City” all over the world. This event turned out to be an important incentive to the economic and entrepreneurial development of the city, putting in relationship very important issues like “economic growth”, “quality of life”, “social development”. Our work aims to show that, by correctly implementing the strategies designed by the Municipality of Rome (the strategic coordinator of the event), all the actors in the system may have good chances in successfully developing the potentialities of this cultural event, both in terms of participation and territorial and temporal expansion, with positive social and economic downfalls on the territory.System Dynamics; Cultural Network; Strategic Management; Local Government

Presentazione

Illustrazione del progetto culturale del libr

Sertao-Pampa. Topografie dell'immaginario sudamericano

Alla radice dell'identità nazionale del Brasile e dell'Argentina, sertao e pampa sono mitologie e scene di infinite rappresentazioni storiche, antropologiche e fisiche

Internazionalizzazione e ricerca nel restauro

The study of conservation in an international context shows many problems from the methodological point of view and about its content. To some extent, this kind of activity can be seen as an utopia and poses an unrealistic aspects: the analysis of the conceptual premises and of the results of the restoration activities is strictly connected with the ‘langue’ of the different cultures and the idea of representing in an organic synthesis the conservation problems is similar to the presumption to create a sort of critic register of the world literature. But the concept of Weltliteratur imagined by Goethe has a big appeal and strong potentialities also in the field of conservation, expecially now, in the era of globalization, when important operative choices are frequently entrusted to stakeholders who are external to the cultural contest of reference. The research in the geography of conservation in the different countries can develop an important role. It can use a double and different level of analysis. The first has an empirical and experiencial nature, in continuity with what has been done still now by institution as Unesco, Iccrom, Icomos and other international relationships. The other has a more scientific approach, that is linked to the histographic strategies and connected to the way of the histoire croisée. This could help to enrich a new vision of conservation from a transnational point of view, permanently overtaking the ‘generalistic’ phase of the apparent comparison between different worlds