1,721,004 research outputs found
A Relationship Mechanism for a Strongly Typed Object-Oriented Database Programming Language
No full textBasic theory of F-bounded quantification
Full text linkSystem F-bounded is a second order typed lambda calculus, where the basic features of object-oriented languages can be naturally modelled. F-bounded extends the better known system , in a way that provides an immediate solution for the treatment of the so-called ``binary methods''. Although more powerful than and also quite natural, system F-bounded has only been superficially studied from a foundational perspective and many of its essential properties have been conjectured but never proved in the literature. The aim of this paper is to give a solid foundation to F-bounded, by addressing and proving the key properties of the system. In particular transitivity elimination, completeness of the type checking semi-algorithm, the subject reduction property for reduction, conservativity with respect to system and antisymmetry of a ``full'' subsystem are considered, and various possible formulations for system F-bounded are compared. Finally a semantic interpretation of system F-bounded is presented, based on partial equivalence relations
Fondamenti di Basi di Dati
No full textLe basi di dati sono comunemente usate per l’archiviazione, il recupero e l’elaborazione di informazioni. Questo libro presenta i concetti fondamentali per progettare, realizzare e usare basi di dati in modo interattivo o a partire da programmi. Per affrontare la progettazione si usa un formalismo grafico che descrive un modello ad oggetti e si ispira al linguaggio unificato UML. La realizzazione è trattata considerando i sistemi relazionali e presentando le caratteristiche del modello dei dati, della teoria della normalizzazione, del linguaggio SQL e le principali funzionalità dei sistemi relazionali. Gli argomenti sono presentati con gradualità per aiutare il lettore a passare agevolmente dai concetti al loro impiego nella realizzazione di applicazioni. Argomenti più specialistici sono trattati separatamente e disponibili sul sito web collegato al libro (http://fondamentidibasididati.it) insieme ad altro materiale utile per lo studio
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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