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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
Kaula- ja aivovaltimodissektoitumien riskitekijät ja taudinkuva
Full text linkCervicocerebral artery dissection (CeAD) is one of the leading causes of ischemic stroke in the young and middle-aged adults. The pathophysiology of CeAD is poorly understood. CeAD patients probably have a constitutional, partly genetic weakness of the vessel wall, which predisposes to tears in the connective tissue within the vascular wall in occurrence of environmental triggers of the disease, such as acute infection, migraine, or minor trauma.
For this thesis project, we collected a register of all consecutive CeAD patients treated at the Helsinki University Central Hospital, Finland, between 1994 and 2008. In the first part of the thesis, we studied 103 patients with intracranial artery dissections (IAD). IADs could be divided into 2 distinct groups: i) non-aneurysmatic IADs presenting without subarachnoid hemorrhage that are associated with favorable outcomes and safe anticoagulant therapy, and ii) aneurysmatic IADs, characterized by subarachnoid hemorrhage and poorer prognosis.
Secondly, we evaluated characteristics, prognostic factors and vascular risk factors in 301 CeAD patients. We found association of CeAD with male sex, and possible association with smoking and migraine, especially migraine with aura. Stroke severity and recent infection were associated with poorer outcome.
The three other publications for the thesis were part of the CADISP project (Cervical Artery Dissection and Ischemic Stroke Patients), an international consortium focusing on research on CeAD. For the clinical part of CADISP, 983 patients with CeAD, 658 patients with ischemic stroke due to causes other than dissection, and 1170 healthy control subjects were included in 8 countries and 18 centers.
In the CADISP cohort, vascular risk factors were less frequent in CeAD patients compared with young patients with a non-CeAD ischemic stroke. In comparison with healthy controls, hypercholesterolemia, obesity, and overweight were less frequent in CeAD patients, whereas CeAD patients had more hypertension. This suggests that hypertension may be a risk factor for CeAD.
Finally, migraine was more common in CeAD patients with stroke than in patients with ischemic stroke due to a cause other than CeAD. We detected no excess of ischemic strokes, specific arterial distribution or other clinical or prognostic features characteristic to migraineous CeAD patients compared to those without migraine.Kaula- ja aivovaltimodissektoituma on yleisimpiä aivoinfarktin aiheuttajia nuorilla ja keski-ikäisillä potilailla. Taudin patofysiologia tunnetaan puutteellisesti. Potilailla ajatellaan olevan altistava valtimoseinämän sidekudoksen rakenteellinen heikkous, mahdollisesti geneettisistä syistä. Heikko seinämä on alttiimpi repeämälle, jonka laukaisee jokin tilapäinen tekijä kuten akuutti tulehdustauti, vähäpätöinen vamma tai migreeni.
Väitöskirjan kaksi ensimmäistä osatyötä perustuu Helsingin ja Uudenmaan sairaanhoitopiirin alueella vuosien 1994-2008 välisenä aikana hoidetuista kaula- ja aivovaltimodissektoitumapotilaista kerättyyn rekisteriin. Ensimmäisessä osatyössä oli mukana 103 kallonsisäisen dissektoituman sairastanutta potilasta. Nämä dissektoitumat jakaantuivat kahteen eri ryhmään: i) ei-aneurysmaattisiin kallonsisäisiin dissektoitumiin, jotka eivät johtaneet lukinkalvonalaiseen vuotoon, joiden ennuste oli hyvä, ja joiden hoidossa verenohennuslääkkeet olivat turvallisia. ii) Lukinkalvonalaiseen vuotoon johtaneisiin dissektoitumiin, joilla oli huono ennuste.
Toisessa osatyössä käsiteltiin kaula- ja aivovaltimodissektoitumapotilaiden taudinkuvaa, ennustetekijöitä ja riskitekijöitä 301 suomalaisen potilaan aineistossa. Enemmistö potilaista oli miehiä, ja dissektoitumapotilailla tupakointi ja migreeni, erityisesti aurallinen migreeni, olivat yleisiä. Vakava aivoinfarkti ja viimeaikaiset tulehdustaudit liittyivät huonompaan ennusteeseen.
Kolme muuta osatyötä ovat osa CADISP-projektia (Cervical Artery Dissection and Ischemic Stroke Patients). Tämän kansainvälisen kaulavaltimodissektoitumien tutkimukseen keskittyvän hankkeen tavoitteet ovat selvittää taudin geneettisiä ja muita riskitekijöitä, sen hoitoa ja ennustetekijöitä. CADISP-hankkeen kliiniseen osaan osallistui 8 maasta 18 keskuksesta 983 kaulavaltimodissektoitumapotilasta, 658 aivoinfarktiverrokkia joilla infarkti johtui muusta syystä kuin dissektoitumasta, ja 1170 tervettä henkilöä.
CADISP-aineistossa sydän- ja verisuonitautien riskitekijöitä oli kaulavaltimodissektoitumapotilailla vähemmän kuin aivoinfarktin muusta syystä sairastaneilla verrokeilla. Terveisiin verrokkeihin nähden dissektoitumapotilailla oli harvemmin kohonneita kolesteroliarvoja ja ylipainoa, mutta useammin korkea verenpaine. Hypertensio saattaakin olla kaulavaltimodissektoituman riskitekijä.
Viidennessä osatyössä todettiin migreenin olevan yleisempää aivoinfarktin saaneilla kaulavaltimodissektoitumapotilailla kuin muusta syystä aivoinfarktin saaneilla verrokeilla. Migreeniä sairastavat kaulavaltimodissektoitumapotilaat eivät eronneet migreeniä sairastamattomista aivoinfarktien yleisyyden, dissektoituneen valtimon, taudinkuvan tai ennusteen suhteen.ei saavutettav
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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