1,720,958 research outputs found
Ruolo della Computer Vision nel controllo dei prodotti ottenuti con materiali compositi.
No full textLa riorganizzazione cerebrale in pazienti con esiti di trauma cranico: analisi funzionale ed elettrofisiologica dei meccanismi di plasticità neuronale alla base del recupero clinico a distanza.
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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
Tecniche di visione artificiale e realtà aumentata finalizzate all'assistenza di un operatore durante l'attrezzaggio di una macchina utensile
No full textLAUREA SPECIALISTICASistemi manualistici di realtà aumentata sono stati sviluppati in ambito militare, aeronautico e dell'automotive. Questi hanno l'obiettivo di aiutare l'operatore mostrandogli la procedura da seguire e gli strumenti da utilizzare, visualizzando inoltre informazioni aggiuntive sui componenti da manipolare o sulle norme di sicurezza da adottare.
Nel presente lavoro di tesi è stato sviluppato un sistema di controllo e supporto alle operazioni dell'utente in grado di verificare il flusso logico della procedura potenziando il concetto di sistema manualistico in realtà aumentata. Il sistema è in grado di assistere, tramite realtà aumentata, l'operatore e di controllare automaticamente le azioni compiute dallo stesso, restituendogli un feedback sul passo eseguito ed avanzando in modo automatico fino alla completa esecuzione della procedura da svolgere. Un sistema così realizzato può essere impiegato in fase di training iniziale del personale, per il supporto allo svolgimento di operazioni complesse di assemblaggio e di manutenzione del macchinario.
Il lavoro di tesi ha implicato lo sviluppo di un sistema di visione in grado di riconoscere delle features naturali presenti all'interno dell'ambiente, così da garantire un sistema di riferimento per la parte di realtà aumentata che si occupa di evidenziare in tempo reale i passaggi da effettuare ed i componenti da manipolare.
Sono stati sviluppati ed integrati nel sistema due algoritmi di visione artificiale in grado di identificare ed inseguire oggetti texturizzati e non. Sulla base dell'output restituito da questi algoritmi, è stato realizzato un sistema di supporto alle decisioni che valuta se un'operazione è stata correttamente eseguita da parte dell'operatore, adatta il flusso logico di conseguenza e visualizza in realtà aumentata l'opportuno feedback all'operatore.
E' stata quindi progettata l'architettura completa e funzionale del sistema e sviluppate ed implementate le componenti fondamentali dell'architettura in un'applicazione di validazione dei metodi utilizzati.Augmented reality-based systems for purposes of assistance, maintenance and repair, have been developed for military applications as well as for aeronautic and automotive employments. These one have the target to assist the user, by showing him the procedure to follow, the tools to employ and, moreover, by displaying further information about the components to be handled or hints about the safety rules to be accomplished.
With this work a system for control-and-support system to assist the final user has been developed. The system is able to verify the logical flow of a certain procedure, by enhancing therefore the role of an "augmented reality based handbook".
The system is able to assist, through the augmented reality, the user and to control automatically his actions, and to send him feedbacks on the operations done, by switching autonomously to the next steps till the end of the procedure. A system designed with these characteristics could be employed for training purposes, as a support tool for complex operations like assembling or maintaining a certain machine.
This work also implied the development of a dedicated vision system able to detect natural features placed inside the scene, this allows to retrieve a fixed coordinate system for the augmented reality module that can highlight, in real time, the procedure steps flow as well as the components to be handled.
Two algorithms for computer vision have been developed, and integrated into the system, able to identify and follow textured and textureless objects. Basing on their outputs, a decision support system has been developed, it judges over the correct execution of the procedure and it adapts the logical flow by displaying to the user the most convenient feedback, in augmented reality.
Then, the whole functional architecture of the system has been designed, and its foundamental modules have been implemented in a test-case application as validation of the adopted methods
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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