1,720,954 research outputs found
Sviluppo di un sistema di taratura per casco strumentato
Full text linkIn this work, a new methodology for the dynamic calibration of a sensorized helmet is proposed. The helmet is a medical device for head motion detection, based on gyroscopes and linear accelerometers. It has been designed for monitoring head motion in patients undergoing neuro rehabilitation.
While a few solutions are available in the literature for the calibration of this particular type of helmet, no solution currently exists that allows for a complete dynamic calibration by taking into account actual head movements.
With the aim of obtaining such a dynamic calibration solution, in this work an instrumented test bench has been designed that replicates typical head movements. Ranges and frequencies for each specific head movement type in the frontal, sagittal and median plane have been retrieved from the literature; data is related to both patients and healthy subjects. Two dynamic calibration prototypes have been produced as the result of subsequent design iterations: the first is capable of reproducing only a few types of principal motions, while the second and final one allows for a complete reproduction of all the principal head movement types. The prototypes have been subjected to experimental testing; the results are analyzed and discussed in the thesis.Il presente lavoro di tesi ha avuto per oggetto lo sviluppo di una nuova metodologia di taratura dinamica di caschi strumentati, utilizzati in campo neuro riabilitativo per rilevare i moti del capo dei pazienti. È stato realizzato un sistema in grado di riprodurre i movimenti tipici della testa.
Il lavoro è iniziato con una ricerca bibliografica per definire i campi di variabilità dei parametri di taratura, ovvero le rotazioni tipiche del capo sul piano frontale, sagittale e trasversale, nonché i loro campi di frequenza. In letteratura si trovano diverse configurazioni per la sensorizzazione del caschetto, con accelerometri e giroscopi, e diversi sistemi ad oggi utilizzati per la loro taratura. Ma non esistono sistemi sviluppati ad hoc, come questo, per poter fare una taratura dinamica, riproducendo proprio le condizioni operative del casco strumentato.
Sono stati realizzati e testati due prototipi, il secondo dei quali, il più complesso, realizza tutte le rotazioni del capo definite dall’analisi bibliografica
Measurement of stress and strain by a thermocamera
No full textIn this paper thermoelaticity and correlation of thermal images are proposed as joint measurement techniques to perform a "full field" measurement of stress and strain on the surface of mechanical components dynamically loaded. Thermoelasticity allow to measure the sum of the principal stress on the surface of a dynamically loaded mechanical component, therefore some researcher proposed the use of data processing methods and combined measurement techniques (using also photoelasticity for example) in order to mesure also the single stress components. Here a new measurement and testing technique, based on the recording of thermal images of a random emissivity pattern and of local thermal fluctuation is proposed to obtain both stress and strain on the specimen surface. Tests has been performed using simple specimen in classical configuration on laboratory testing machines. Results and possibility of this new measurement technique are discussed
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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