1,721,147 research outputs found
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
Beyond the Trees: A Comparison of Nonwoody Species, and Their Ecology, in Papua New Guinea Elevational Gradient Forest
No full textThis study appraises the richness of nonwoody species (ferns, herbs, lianas, palms, and shrubs) in 31 sites across undisturbed and disturbed forests in the lowland of Papua New Guinea (PNG) and at montane forest sites at 2,700 m a.s.l. The assessment was conducted following the PNG National Forest Inventory protocol. The results indicate that with 463 nonwoody species, the tropical forest of PNG has remarkable species richness. No significant difference was observed in richness among lowland, logged and pristine, and montane forests. The study shows that the richness of nonwoody species increases with elevation, but this trend is different when considering the taxonomic group separately. Palms and lianas decrease along the elevation, whereas ferns, herbs, and shrubs are positively correlated with elevation. The species composition between lowland forest and mountain sites is different, with a tree fern and an Araliaceae as an indicator of the mountain forest. The findings demonstrate a high taxonomic richness of nonwoody species in PNG, supporting previous research but highlighting the significant contribution of nonwoody species to the overall plant richness in a tropical habitat
Notebooks from New Guinea reflections on life, nature and science from the depths of the rainforest
No full textkoamabayili/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
Acute cerebral infarcts in multiple arterial territories : The Bergen NORSTROKE study
Full text linkIntroduction The majority of acute cerebral infarcts results from an occlusion of one single cerebral artery followed by loss of blood supply to the respective arterial territory. However, several independent arterial territories may be affected if more than one cerebral artery is occluded simultaneously. Acute cerebral infarcts in multiple arterial territories (MACI) account for 10 to 20 % of all ischemic strokes. MACI may have distinct pathophysiological and clinical features differing from acute cerebral infarct(s) in a single arterial territory (SACI). Aims In this dissertation, we sought to give a broad description of patients with MACI. The aim of the first two papers was to clarify pathophysiological mechanisms in regards to the etiology. In the third paper, we assessed short-term outcome and complications within the first week after the hospital admission. The fourth paper sheds light on the clinical manifestation on admission. Methods We used data from the Bergen NORSTROKE registry. We included only patients with acute cerebral infarct(s) (ACI) confirmed by diffusion-weighted magnetic resonance imaging (DWI-MRI) consecutively admitted to the stroke unit at Haukeland University Hospital. The first two papers are based on a cohort of 2125 patients admitted from 2006 to 2013. The last two papers are based on a cohort of 3343 patients admitted in an extended time frame from 2006 to 2016. MACI was defined as more than one non-continuous ischemic lesion in more than one arterial cerebral territory; either left and/or right carotid artery territory and/or basilar artery territory. Results The proportion of patients with MACI was approximately 9% of all ACI patients. The paper-I confirmed that cardiogenic embolism (CE), as defined by TOAST criteria, is the most frequent underlying etiology of MACI. The paper-II showed a positive correlation between the time from stroke onset to MRI examination and frequency of large artery atherosclerosis (LAA)-associated MACI. There was no correlation between the time from stroke onset to MRI examination and frequency of CE- 6 associated MACI. These findings suggest that CE-associated MACI occur simultaneously as a shower of emboli, while LAA-associated MACI happens rather successively over time. The paper-III showed that patients with MACI have a worse short-term outcome within the first week after the admission compared to patients with SACI. Moreover, MACI was associated with more in-hospital complications, namely deep venous thrombosis and myocardial infarction. The paper-IV showed that 72% of patients diagnosed with MACI presented with a single-territory clinical manifestation (MACI-S) on admission. MACI-S was associated with less than five ischemic lesions on DWI-MRI, involvement of the left hemisphere, and a partial anterior cerebral infarct stroke syndrome (PACI) as defined by the Oxfordshire Community Stroke Project (OCSP) classification. This finding emphasizes the essential role of MRI examination for final diagnosis of MACI. Conclusion The data presented in this dissertation show that patients with MACI differ in many clinical aspects from patients with SACI. Our findings add new knowledge to this less documented field of stroke medicine and may help to improve the diagnostic and therapeutic approaches in these patients
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