1,721,186 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
Young massive stars in the ISOGAL survey. II. The catalogue of bright YSO candidates
No full textThe 7 and 15 mu m observations of selected fields in the Galactic Plane obtained with ISOCAM during the ISOGAL program offer a unique possibility to search for previously unknown YSOs, undetected by IRAS because of lower sensitivity or confusion problems. In a previous paper (Felli et al. \cite{FCTOS00}) we established criteria of general validity to select YSOs from the much larger population of Post Main Sequence (Post-MS) stars present in the ISOGAL fields by comparing radio and IR observations of five fields located at l ~ +45deg. The selection was based primarily on the position of the point sources in the [15]-[7]-[15] diagram, which involves only ISOGAL data and allows to find possible YSOs using the survey data alone. In the present work we revise the adopted criteria by comparing radio-identified UC HII regions and ISOGAL observations over a much larger region. The main indications of the previous analysis are confirmed, but the criteria for selecting YSO candidates had to be revised to select only bright objects, in order to limit the contamination of the sample by Post-MS stars. The revised criteria ([15]le4 .5, [7]-[15]ge1 .8) are then used to extract YSO candidates from the ISOGAL Point Source Catalogue in preparation. We select a total of 715 YSO candidates, corresponding to ~ 2% of the sources with good detections at 7 and 15 mu m. The results are presented in a table form that provides an unique input list of small diameter, le 6 arcsec, Galactic YSO candidates. The global properties of the sample of YSO candidates are briefly discussed. This is paper No. 11 in a refereed journal based on data from the ISOGAL project
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
The search for YSOs from ISOGAL data. Application to the l = +45 field
No full textThe 7 and 15 mu m observations of the Galaxy obtained by the ISOGAL program offer an unique possibility to investigate and separate the different populations of stars in the Galactic Plane, in particular to study the population of low flux density YSOs which could not be detected with IRAS. Considering the results obtained by ISOCAM in nearby star forming regions and in other test fields in the Galactic Plane, as well as theoretical indications, we establish criteria of general validity that can be used to select YSOs from the much larger population of Post Main Sequence (Post-MS) stars present in the ISOGAL fields. The selection is based primarily on the position of the sources in the [15] - [7]-[15] diagram, which involves only ISOGAL data and allows to select objects with IR excess as possible YSOs using the survey data alone. The criteria are applied to five ISOGAL fields centered at l ~ +45deg and b ~ 0deg, covering a total area of 0.504 deg2. The total number of point sources detected in both filters above the confidence limits of [7] < 9.5 and [15] < 8 are 386. The ISOGAL results are compared with radio observations in order to identify high luminosity YSOs out of the larger population of lower luminosity ones. We find 3 high luminosity YSOs plus 3 diffuse sources which are associated with HII regions and 35 lower luminosity YSOs. For low flux densities we find a consistent number of sources (73) detected only at 15 mu m which, according to the colour upper limit, are classified as candidate YSOs. The validity of the adopted criteria for selecting possible YSOs in the ISOGAL fields are also supported by two independent results: 1) the sources classified as YSOs and the candidate YSOs are often associated with diffuse nebulosities visible at 15 mu m, landmarks of recent star forming activity, and 2) the numbers of high luminosity and low luminosity YSOs that we have found compare well with the expectations. This is paper no. 8 in a refereed journal based on data from the ISOGAL project
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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