1,721,108 research outputs found
INTELLIGENZA ARTIFICIALE: DALL’IMITAZIONE ALLA SOSTITUZIONE DELL’UOMO? PROSPETTIVE E PROBLEMI APERTI.
No full textLe tecniche di I.A. sono tanto più sofisticate e complesse quanto più progrediscono le discipline scientifiche su cui si fondano e i prodotti industriali sono tanto più evoluti quanto più sono perfezionate tali tecniche, le metodologie e gli strumenti disponibili per la produzione.
Una breve rassegna dell’evoluzione dell’I.A. permette di individuare le acquisizioni più significative, individuare la radice dei principali problemi, tentare di intuirne i possibili sviluppi, portare in evidenza i punti di riflessione costanti e quelli maggiormente legati alle contingenze tecnologiche.
I principali problemi aperti si riscontrano sui due versanti delle possibilità applicative dell'I.A. e del "governo" della tecnologia attraverso statuti etici, norme e leggi, ma emerge con una certa chiarezza la necessità di confrontarsi con la concezione antropologica in un mondo sempre più pervaso di tecnologia digitale, tanto da ipotizzare l'opportunità di definire un nuovo umanesimo tecnologico
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
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
Lesioni mucose nella psoriasi
No full textLa psoriasi è sempre stata considerata una patologia cutanea caratterizzata da lesioni eritemato-squamose, a decorso cronico-recidivante, che risparmia tipicamente le membrane mucose. Oltre un secolo fa Oppenheim descrisse alterazioni della mucosa orale che all'esame istologico mostravano l'aspetto della psoriasi. Negli anni'70 si avviano i primi studi sistematici sull'argomento e negli anni successivi compaiono numerose segnalazioni di lesioni del cavo orale e delle altre mucose in soggetti affetti da psoriasi, ma la loro reale natura rimane ancora controversa. Gli autori riportano le osservazioni compiute in 60 pazienti affetti da psoriasi in placche, con o senza artropatia, ed in 60 soggetti di controllo, seguiti presso la Clinica Dermatologica di Terni. I risultati evidenziano che lesioni dela cavo orale quali la lingua a carta geografica e la lingua fissurata sono signifcativamente più comuni nei soggetti psoriasici
The Effect of Changing the Tio2 Content (0-6-percent) On the Structure and Thermal Evolution of Glasses Obtained From Porphyric Sands and Dolomite
No full textGlasses have been obtained from mixtures of porphyric sands and dolomite. The influence of changes in the TiO2 content(0-6%) on the glass structure and the formation of crystalline phases on reheating has been studied. The experimental results suggest that in the studied system TiO2 promotes glass-in-glass phase separation and plays the role of a nucleating agent. The activation energy for crystal growth, E(C) = 486 kJ mol(-1), and the Avrami parameter (m = 1) have been evaluated by means of thermoanalytical techniques in the case of the base glass (no TiO2 added). The value of the Avrami parameter (tit = 1) agrees well with SEM observations of dendritic crystal growth from surface nuclei. In the other glasses, lath-like crystals were observed, the microstructure being finer the greater the TiO2%. The first addition of TiO2 (2%) gives, on quenching, a partially devitrified product; subsequent additions of titania, surprisingly, allow glasses to be formed more easily. The experimental results suggest that Na2O and K2O, present in the porphyric sands and therefore in the glasses (to a total amount of approximate to 5.6%), segregate preferentially into the titania-rich phase with respect to MgO. Taking into account that Na2O and K2O are useful in lowering the liquidus temperature of glasses but are known to have a negative effect on the mechanical properties, this can be important in the production of glass ceramics
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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