1,721,068 research outputs found
MODELLAZIONE E OTTIMIZZAZIONE DI UNA PROTESI TRANSTIBIALE PER ATTIVITA’ SPORTIVA
No full textE' descritta l'attività sperimentale per le prove statiche e a fatica eseguite su protesi transtibiale. Sono stati realizzati dei modelli numerici delle protesi, i modelli sono stati validati tramite confronto con valori delle deformazioni misurate sperimentalmente sulel protesi. I modelli numerici sono stati, poi, uitlizzati per l'ottimizzazione delle proteis stess
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
A quantitative study of Public Key infrastructures
No full textPublic Key Infrastructures have not reached the widespread diffusion expected of them, although they are well understood from a security point of view, because, like many say, the killer application has not been found yet. The lack of a clear understanding of the performance of these systems also contributes significantly to their limited diffusion. Studies have appeared of specific aspects of the operations of PKIs, but no complete studies of the overall system are known.
In this paper we present an evaluation study of X.509-compliant Public Key Infrastructures using queuing network models. We focus our analysis on the performance of the subsystem in charge of generating and managing digital certificates, under a variety of load conditions, both in terms of the type of requests and their number. We also investigate the impact on the performance of the system of some implementation choices such as revocation mechanisms and auditing activities. The main result of our analysis is that the system we consider, given the current state of technology, can guarantee acceptable response time in steady state even in the presence of PKI with a consistent number of users. However, in order to guarantee such a performance level, throughput must not exceed 3.5 requests per second, where a request can be a certificate generation or revocation request. Such a limitation hinders the deployment of PKIs with large numbers of users, since recovering after a system compromise may require an unacceptable amount of time
Preeclampsia
Full text linkHypertensive disorders complicate approximately 10- 20% of pregnancies and cover a spectrum of diffe- rent clinical pictures with varying impact on the health of mother and fetus. Among these pre-eclampsia (PE) represents the most severe form, being alone respon- sible for 15-20% of cases of maternal mortality and a major cause of perinatal mortality and morbi- dity.
The clinical significance of hypertensive disorders in pregnancy is also linked to the possibility of serious maternal complications represented by HELLP syn- drome (characterized by hemolysis, elevated liver fun- ction and low platelet count), eclampsia and dissemi- nated intravascular coagulation (DIC).
Laboratory monitoring of indices (blood count, pla- telet count, liver function, renal function, uric acid, LDH, proteinuria, etc.), associated with the evaluation of the patient’s clinical condition, is the only tool available to the clinical diagnosis and subsequent management of various conditions, with particular reference to the ti- ming of childbirth, the only real treatment of PE. Key-words: pregnancy, gestosis, preeclamsia, laboratory findings, HELLP syndrome
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
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