1,720,965 research outputs found
Evoluzione dei sistemi operativi: Categorie particolari
No full textL’articolo costituisce la seconda parte di un lavoro relativo all’evoluzione dei sistemi operativi. Esaminate nella prima parte le motivazioni che hanno influenzato l’evoluzione del concetto stesso di sistema operativo, sono ora messe in evidenza e discusse le motivazioni che hanno portato all’evoluzione di particolari categorie di sistemi operativi: da quelli per personal computer ai sistemi real-time ed embedded, dai sistemi operativi di rete e distribuiti a quelli per la generazione di macchine virtuali
Paolo Zacchia, the concept of poison and the foundations of forensic toxicology. A review
No full textThe authors examine the 'quaestiones' dealt with by Zacchia on the subject of poison, plotting some of the basic lines along which the autonomous scientific perspective of forensic toxicology has historically developed. In particular, the logical and argumentative itinerary that Zacchia followed in restating the concept of poison, re-interpreting the various pre-existing concepts according to the specific lines of a new discipline, is analyze
Evoluzione dei sistemi operativi: dai sistemi batch a Linux
No full textNel ripercorrere le motivazioni che hanno portato all'evoluzione delle funzioni di un Sistema operativo viene evidenziato come tale evoluzione sia stata fortemente influenzata dai progressi di altre branche dell'intera disciplina informatica ed al tempo stesso abbia a sua volta influenzato il progresso
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
Programmazione Concorrente e Distribuita
No full textIl libro si articola in tre parti distinte. La prima contiene i principali concetti che stanno alla base della programmazione concorrente e distribuita. Vengono inoltre presentate le principali problematiche introdotte dalla concorrenza, alla soluzione delle quali sono dedicati i successivi capitoli. Nell'introdurre i principali strumenti linguistici necessari per la specifica della concorrenza, vengono anche descritti i meccanismi offerti dal nucleo del Sistema Operativo necessari per fornire loro il supporto.
La seconda parte del libro è dedicata alla programmazione concorrente in senso stretto, cioè alla concorrenza all'interno di una architettura non distribuita. La terza parte , infine, è invece dedicata alla programmazione distribuita, cioè al caso in cui la concorrenza riguardi parti di uno stesso programma distribuite nell'ambito di un'architettura composta da macchine interconnesse tramite una rete di comunicazione
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Adaptive Routing Strategies for Dynamic Applications in Massively Parallel Architectures
No full textRouters in a dynamic environment must efficiently deliver messages without knowledge of an application's process allocation. We've developed an adaptive routing system for a completely dynamic environment. Our system proposes two different strategies, depending on the application's communication patterns. In the first solution, the Hot-Spot Avoiding (HSA) algorithm, each message separately finds the route toward the destination. Even messages exchanged between the same couple of processes follow different, possibly nonminimal, paths. The HSA algorithm uses neighborhood information to choose the node to which the message is forwarded. It limits the number of hops in the source-destination path by reducing the occurrence of loops in it. The second algorithm, Virtual Path (VP), is tailored to long-lasting entities that cooperate intensively by exchanging messages. It achieves efficiency by finding a path at the beginning and following that path for several messages. For performance's sake, this algorithm partially renounces the HSA algorithm's adaptivenes
A Routing Strategy for Object-oriented Applications in Massively Parallel Architectures
No full textRouters in a dynamic environment must efficiently deliver messages without knowledge of an application's process allocation. We've developed an adaptive routing system for a completely dynamic environment. Our system proposes two different strategies, depending on the application's communication patterns. In the first solution, the Hot-Spot Avoiding (HSA) algorithm, each message separately finds the route toward the destination. Even messages exchanged between the same couple of processes follow different, possibly nonminimal, paths. The HSA algorithm uses neighborhood information to choose the node to which the message is forwarded. It limits the number of hops in the source-destination path by reducing the occurrence of loops in it. The second algorithm, Virtual Path (VP), is tailored to long-lasting entities that cooperate intensively by exchanging messages. It achieves efficiency by finding a path at the beginning and following that path for several messages. For performance's sake, this algorithm partially renounces the HSA algorithm's adaptiveness
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