1,721,017 research outputs found
Estimating unobservable signal with Markovian noise induction
No full textA sub threshold signal is transmitted through a channel and may be detected when some noise - with known structure and proportional to some level - is added to the data. There is an optimal noise level, called of stochastic resonance, that corresponds to the minimum variance of the estimators in the problem of recovering unobservable signals. For several noise structures it has been shown the evidence of stochastic resonance effect. Here we study the case when the noise is a Markovian process.We propose consistent estimators of the sub threshold signal and we solve further a problem of hypotheses testing. We also discuss evidence of stochastic resonance for both estimation and hypotheses testing problems via examples
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
Abbondanza degli zigoli (Emberizidae) in relazione all'uso del suolo nell'Appennino settentrionale
No full textVariations 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
Che cosa sono i negri? L’ouvrage censuré de Daniele Sorur
No full textChe cosa sono i negri? est un manuscrit de 1889, inédit, qui dénonce les théories racistes de l’Europe de l’époque et analyse les causes historiques du retard du développement du continent africain. Il propose un renouveau des sociétés africaines à travers la conversion au christianisme effectuée par les Africains eux‑mêmes. Daniele Sorur Pharim Den (v. 1859‑1900), Dinka du sud Soudan, en est l’auteur. Réduit en esclavage par des marchands arabes, affranchi par le missionnaire Daniele Comboni, séminariste à Rome et à Beyrouth, il est ordonné prêtre en 1887 au Caire et sera missionnaire en Afrique toute sa vie. Son ouvrage tire son inspiration de ses voyages en Europe entre 1889 et 1891. Africain et prêtre, séminariste en Europe, mais missionnaire en Afrique, Sorur dans son récit se présente en tant que pont entre les deux continents, en proposant une vision originale de la régénération de l’Afrique par les Africains.Che cosa sono i negri? is an unpublished manuscript from 1889 denouncing racist theories in Europe and analysing the historical causes of Africa's underdevelopment. The author, a former African slave called Daniele Sorur Pharim Den (ca. 1859‑1900), suggests converting the society to Christianity as a possible solution. After his liberation from slavery by missionary Daniele Comboni, Sorur attended Propaganda Fidei collegium in Italy, then moved to Beirut to study at the University Saint Joseph. After being ordained in Cairo in 1887, he was finally relocated to Africa where he spent the rest of his life as a missionary. Inspired to write by his commitment against slavery and for missions, Sorur created an unprecedented document thanks to his unique position as both a native African and a Catholic priest. In it, he proposed an original vision of regeneration of Africa by Africa.Che cosa sono i negri? è un manoscritto del 1889, ancora inedito, di denuncia contro le teorie razziste diffuse in Europa nonché di analisi delle cause storiche alla base del ritardo di sviluppo delle società dell’Africa nera rispetto a quelle europee e di proposta per un loro rinnovamento tramite la conversione al cristianesimo del continente per mano degli stessi africani. L’autore è un Dinka del Sudan del Sud, Daniele Sorur Pharim Den (1859ca.‑1900), fatto schiavo da dei mercanti arabi e liberato a 13‑14 anni dal noto missionario Daniele Comboni, seminarista in Italia presso il collegio Urbano de Propaganda Fide e poi a Beirut all’Université Saint Joseph, ordinato sacerdote nel 1887 al Cairo e missionario in Africa per il resto della sua vita. Lo spunto per la sua opera viene a Sorur dalla raccolta fondi contro la schiavitù e per le missioni africane che sta compiendo tra il 1889 e il 1891 per alcune città del centro Europa. Nella duplice veste di africano e prete cattolico, seminarista in Europa ma missionario in Africa, Sorur in questo scritto si pone a ponte tra i due continenti e propone una propria originale via di rigenerazione dell’Africa con l’Africa
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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