225 research outputs found
An efficient relational deductive system for propositional non-Classical logics
No full textWe describe a relational framework that uniformly supports
formalization and automated reasoning in varied propositional modal logics. The proof system we propose is a relational variant of the classical Rasiowa-Sikorski proof system. We introduce a compact graph-based representation of formulae and proofs supporting an efficient implementation of the basic inference engine, as well as of a number of refinements. Completeness and soundness results are shown and a Prolog implementation is described
Dentro le imprese: un'analisi degli indicatori di bilancio
No full textIl capitolo esamina i bilanci delle imprese siciliane che hanno risposto all'indagine RES sull'internazionalizzazione delle imprese, confrontando i loro dati di bilancio con l'insieme delle imprese censite dalla banca dati CeBi Cerved. All'interno del campione di imprese che hanno partecipato all'indagine confronta i bilanci classificando le imprese per intensità e continuità della loro esperienza di export
Le dighe del Belice. L'acqua e la pianificazione organica
No full textLa tesi affronta il caso studio del progetto per le dighe Jato e Garcia richieste dalla popolazione in un processo promosso da Danilo Dolci e dai Centri Studi e Iniziative per la Piena Occupazione, nel contesto della Sicilia occidentale degli anni Cinquanta e Sessanta.
Dolci coinvolge direttamente le popolazioni locali in un progetto partecipato, definito pianificazione dal basso, per richiedere le grandi infrastrutture idriche alle autorità, allo scopo di ottenere l’accesso democratico all’acqua come motore di sviluppo in una zona arida ed estremamente depressa.
Queste condizioni di siccità e di arretratezza economica non solo risultano già diffuse allo stato attuale nel contesto del bacino Mediterraneo e in numerose aree del mondo, ma potrebbero estendersi notevolmente nello scenario di crisi dovuta ai cambiamenti climatici. Le aree marginali o depresse saranno esposte ai maggiori rischi idrologici, in quanto prive di risorse economiche per affrontare la crisi idrica che si verificherà, secondo i più accreditati scenari, intorno al 2050.
La tesi propone una ricostruzione organica dell’esperienza in Sicilia occidentale, ricomponendo in un unico processo le vicende delle dighe Jato e Garcia e indagandone le ricadute trasformative sul paesaggio dal progetto a oggi. L’obiettivo è di mostrare come il caso del progetto dal basso per le dighe del Belice risulti un esempio riuscito di avvio di uno sviluppo locale autonomo su base partecipativa, a partire da un’infrastrutturazione idraulica a grande scala pianificata insieme alla popolazione. Per questa ragione, l’analisi del caso studio può contribuire ad arricchire il campo delle soluzioni sostenibili per le modalità di intervento in zone aride arretrate.
La ricerca ricostruisce i metodi e l’evoluzione del processo di pianificazione organica dal basso di Dolci e dei Centri Studi, allo scopo di individuare strumenti e strategie potenzialmente applicabili in contesti fragili caratterizzati da condizioni simili alla sub-regione di intervento, mettendo in luce l’evoluzione e il valore di un percorso partecipato originale nella cultura urbanistica italiana degli anni Cinquanta-Sessanta
On the elimination of quantifiers through descriptors in predicate logic
No full textWe present a variant of the Davis–Fechter’s technique for eliminating quantifiers in first-order logic, aimed at reducing the incidence of irrelevant dependencies in the construction of Skolem terms.
The basic idea behind this contribution is to treat as a single syntactic unit every maximal ‘quantifier batch’, i.e., group of contiguous alike quantifiers, whose internal order (which has no significance) is thereby
prevented from entangling the final result.
Through concrete cross-translations, our version of the free-variable predicate calculus turns out to be equipollent—in means of expression and of proof—to the one originally proposed by Davis and Fechter and hence
to a relatively conventional version of quantified first-order logic
A graphical representation of relational formulae with complementation
No full textWe study translations of dyadic first-order sentences into equalities between relational expressions. The proposed translation techniques (which work also in the converse direction) exploit a graphical representation of formulae in a hybrid of the two formalisms. A major enhancement relative to previous work is that we can cope with the relational complement construct and with the negation connective. Complementation is handled by adopting a Smullyan-like uniform notation to classify and decompose relational expressions; negation is treated by means of a generalized graph-representation of formulae in L+, and through a series of graph-transformation rules which reflect the meaning of connectives and quantifiers
Imaging of Urologic Trauma
No full textUrologic trauma encompassed a wide range of injuries affecting the urologic tract, resulting from various traumatic events or iatrogenic procedures. This review explores the clinical presentation, diagnostic strategies, and management approaches of urologic trauma, emphasizing the critical role of imaging, particularly computed tomography, in accurately assessing and guiding treatment decisions. Renal, ureteral, bladder, and urethral trauma are comprehensively discussed, including mechanisms of injury, classification systems, and therapeutic interventions. In addition, we discuss potential complications such as post-traumatic urinoma, delayed bleeding, urinary fistula, perinephric abscess, pyelonephritis, and hydronephrosis
Hotel Asmundo di Gisira. Studio Gum
No full textTourists staying at the Asmundo di Gisira residence continue to travel through the myths and legends of the city of Catania. The house where travellers stay is located in one of the eighteenth-century buildings in Piazza Mazzini in the heart of the Sicilian city. The interior design, by Studio Gum architects, aims to establish a continuous dialogue between modern and antique: no era prevails over the other, each element enhances the other, creating an elegant and welcoming atmosphere. Here, architecture, art and design find not only an aesthetic value, but also a narrative role. With the contribution of craftsmen and artists, each room is designed to tell the story of a myth. The stories of Colapesce, Proserpina, Uzeta, Aci and Galatea, Eliodoro, Billonia and Sant'Agata become tangible material. In this project it is clear that architecture is not only technical, through form it is possible to transmit knowledge and arouse emotions
EGITH - Engendering Data. Steps Towards an Ontology for the Representation of Gender in Cultural Heritage
No full textThe neologism en-gendering indicates the process of generation, production, and constitution of gender. From this point of view, gender is a semiotic device assumed by subjects in the formation of their own identity, adhering to the effects of meaning produced by the models and habitus of a given culture. Feminist scholars have long analysed the process in Art and Literature, but this knowledge is fragmented and not yet adequately supported by digital tools. In this paper we describe EGITH (En-gendering Identities Through History) an extension of GenderedCHContents, an ontology aligned with the Europeana Data Model (EDM), designed to capture concepts related to the construction of gender in the CH domain [2]. We further extend the ontology GenderedCHContents with fine-grained information, relative to the narrative and semiotic dimension of gender in CH. For the modelling of fictional characters we rely, on the one hand, on the semiotic of Charles Sanders Peirce and the Narrative Theory of Umberto Eco [3], while on the other, we rely on the tradition of feminist literary criticism. EGITH is populated with data concerning the main female characters in two well-known literary works of the Italian canon, Dante’s Divina Commedia and Boccaccio’s Decameron, and their literary critique
Focusing on contraction
No full textFocusing [1] is a proof-theoretic device to structure proof search in the sequent calculus: it provides a normal form to cut-free proofs in which the application of invertible and non-invertible inference rules is structured in two separate and disjoint phases. It is commonly believed that every “reasonable” sequent calculus has a natural focused version. Although stemming from proof-search considerations, focusing has not been thoroughly investigated in actual theorem proving, in particular w.r.t. termination, if not for the folk observations that only negative formulas need to be duplicated (or contracted if seen from the top
down) in the focusing phase. We present a contraction-free (and hence
terminating) focused proof system for multi-succedent propositional intuitionistic logic, which refines the
G4ip calculus of Vorob’ev, Hudelmeier
and Dyckhoff. We prove the completeness of the approach semantically and argue that this offers a viable alternative to other more syntactical means
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