1,720,996 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
New epidemiological approaches of type 2 myocardial infarction : towards personalized care
No full textIntroduction : l’infarctus du myocarde (IDM) de type 2, qui résulte d’un déséquilibre entre les apports et les besoins en oxygène du myocarde en l’absence d’événement athéro-thrombotique, est une entité mal connue. L’objectif de ce travail était de préciser certains aspects épidémiologiques et diagnostiques de l’IDM de type 2, notamment la place de la maladie coronaire, et d’évaluer la pertinence clinique et pronostique d’une nouvelle classification des IDM proposée par de LemosMéthodes : A partir de la base de données de l’Observatoire des Infarctus de la Côte d’Or (RICO), nous avons analysé les données des patients hospitalisés pour un IDM entre 2012 et 2017, après adjudication des IDM de type 1, de type 2 et des sous types identifiés selon la nouvelle classification distinguant les IDM de type 2 avec (IDM de type 2A) et sans maladie coronaire sous-jacente (IDM de type 2B). Nous avons également réalisé une revue systématique de la littérature sur la maladie coronaire obstructive (MCO) dans l’IDM de type 2 à partir de la base de données PubMed®. Enfin, nous avons travaillé sur le REgistre des InfArctus de CôTe d’IVoire (REACTIV) hospitalisés pour un IDM entre 2018 et 2022 à l’Institut de cardiologie d’Abidjan, afin d’identifier les spécificités des IDM de type 2 dans cette population Sub-Saharienne.Résultats : Parmi les 4573 patients inclus dans l’observatoire RICO sur une période de 5 ans, 3806 (81,1%) patients et 767 (18,9%) présentaient respectivement un IDM de type 1 et un IDM de type 2 après reclassification. Une coronaropathie obstructive était retrouvée chez 68,6 % des patients atteints d’IDM de type 2. L’IDM de type 2A concernait des patients plus âgés (âge médian 78 ans), avec davantage de comorbidités, et il était associée à un plus mauvais pronostic à 1 an, comparativement aux IDM de type 2B et aux IDM de type 1 de nature athéro-thrombotique (type 1A). Nos données retrouvent un surrisque, d’environ 40%, pour la mortalité toutes causes (RR 1,362; IC95% 1,029-1,802) de l’IDM de type 2A par rapport à l’IDM de type 1A. La revue systématique nous a permis de monter une prévalence particulièrement variable de la MCO dans l’IDM de type 2 (entre 30 et 92%), dépendante des définitions, du mode diagnostique de la coronaropathie et de l’origine des populations étudiées. Chez des patients admis aux urgences, un antécédent de MCO était un facteur prédictif indépendant de présenter un IDM de type 2 par rapport à un IDM de type 1, avec une augmentation de cette probabilité de près de 40%. (RR 1,38; IC95% 1,08-1,77). Enfin, parmi les patients inclus dans le programme REACTIV, 62 (14,1%) ont présenté un IDM de type 2. Comparativement aux IDM de type 1, les IDM de type 2 avaient une tendance à être plus jeunes (54 vs 58 ans, p = 0,09), avec une plus faible fréquence de facteurs de risque cardiovasculaires. Les IDM de type 2 présentaient une MCO moins sévère, avec une atteinte tritronculaire moins fréquente (p < 0,001). Dans cette population sub-saharienne, l'embolie coronaire (24,2 %), l'hypertension sévère ± hypertrophie ventriculaire gauche (22,6 %) et la tachyarythmie (16,1 %) constituaient les principaux facteurs déclenchants.Conclusion : Nos travaux soutiennent l’hypothèse que l’IDM de type 2, souvent considérée comme une pathologie gériatrique, semble en réalité présenter une grande hétérogénéité épidémiologique et physiopathologique. De plus, nous suggérons que l’identification de la maladie coronaire, dont la prévalence est élevée, pourrait permettre d’améliorer la caractérisation et la stratification du risque des IDM de type 2 et ainsi guider le développement d’études interventionnelles pour améliorer leur prise en charge.Introduction : Type 2 myocardial infarction (MI) resulting from an imbalance between oxygen supply and demand, in the absence of atherothrombosic phenomenom, remains an enigmatic clinical entity. This work aimed to precise type 2 MI epidemiological and prognostic features, especially the key role of coronary artery disease (CAD), and to appraise the clinical and prognostic relevance of a new classification of MI proposed by de Lemos.Method : Using the Observatoire des Infarctus de la Côte d'Or (RICO), we collected data from patients hospitalized for MI, including differentiation between type 1 (T1MI) and type 2 MI (T2MI), after adjudication of type 1 MI and type 2 MI, and sub-groups according to the new classification, with categorization of T2MI into those with (T2AMI) or without (T2BMI) obstructive coronary artery disease (CAD). We also conducted a systematic review of the literature on the role of obstructive CAD in T2MI using the PubMed® database. Finally, we analyzed data from the REgistre des InfArctus de CôTe d'IVoire (REACTIV) at the Abidjan Heart Institute, in order to identify the specific features of type 2 MI in this Sub-Saharan Africa population.Results : Among the 4573 patients included in RICO over a 5-year period, 3806 (81.1%) and 767 (18.9%) had T1MI and T2MI after reclassification, respectively. Obstructive CAD was identified in 68.6% of patients with T2MI. T2AMI affected older patients (median age 78 yo), with more comorbidities, and is associated with poorer outcomes after 1-year follow-up, compared with T2BMI and even T1MI due to atherothrombosis (T1AMI). Our data show a 40% excess all-cause mortality at 1-year (HR 1.362; IC95% 1.029-1.802) in T2AMI versus T1AMI. Based on the systematic review of the literature, we found a wide range of CAD prevalence in type 2 MI (between 30% and 92%), depending on definition criteria, diagnostic tools and populations studied. In patients admitted to the emergency department, history of obstructive CAD was an independent predictor of T2MI versus T1MI, increasing this probability by 40% (OR 1.38; 95%CI 1.08-1.77). Finally, of the MI patients included in REACTIV registry over 4 years, 62 (14.1%) met the definition of T2MI. Patients with T2MI were slightly younger (54 vs. 58 years, p = 0.09) with fewer conventional CV risk factors. Patients with T2MI had less severe CAD, with less 3-vessel CAD (p < 0.001). The main triggering factors for T2MI in this Sub-Saharan population were coronary embolism (24.2%), severe hypertension ± left ventricular hypertrophy (22.6%) and tachyarrhythmia (16.1%).Conclusion : Our work support the hypothesis of epidemiological and pathophysiological heterogeneity of T2MI, despite it is increasingly considered as a geriatric condition. Furthermore, we suggest that the identification of CAD, which is highly prevalent, could improve the characterization and risk stratification of type 2 MI, and help target interventional studies to improve its management and outcomes
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Approche épidémiologique des infarctus du myocarde de type 2 : Etiologies, caractéristiques, traitements et pronostic.
No full textIntroduction: Type 2 Myocardial infarction (MI)has been recently defined as an imbalance between oxygen supply and demand, in the absence of atherothromthrombosis. This work aimed to describe the main etiolgies as well as epidemiological, clinical and prognostic characteristics.Method: Data from patients with type 2 MI were collected from the RICO cohort (Observatoire des Infarctus de Cote d'Or). In a complementary work, we analyzed the retrospective data of the emergency department of Dijon University Hospital.Results: Among 4,436 consecutive patients hospitalized for MI in Dijon emergency department over 3 years, 947 (21%) had type 2 MI (median age: 81 years). In the RICO cohort, 4,572 consecutive patients, including 862 (19%) type 2 MI were included over 5 years (median age: 77 years). Intra-hospital mortality after type 2 MI was 14% among ED patients and 11% for RICO patients. The most common chronic conditions predisposing to type 2 MDI were severe anemia and severe aortic stenosis. An acute infection, from the respiratory tract for rougly 2/3 of them, was found in 10% of all MI in the RICO database, and was by far the most common precipitating factor in the pathogenesis of type 2 MI. Concerning therapeutics, after adjustments on propensity scores, red blood cell transfusion was associated with a one-year mortality reduction for patients >80 years of age with a hemoglobin nadir ≤ 8 g/dL. In Post-infectious PI, percutaneous coronary intervention was not associated with a better prognosis than drug treatment alone (one-year mortality of 24% vs 19%, p = 0.5).Conclusion:Type 2 MI is an underdiagnosed condition, representing 20% of all MI, and is common in the elderly. It is associated with an over-risk of mortality compared with type 1 MI. Acute infections, particularly from the respiratory tract, are the most common triggering factor. Based on observational data, invasive procedures do not appear to be associated with improved prognosis.Introduction : L’infarctus du myocarde (IDM) de type 2 a été récemment défini par un déséquilibre entre apports et besoins du myocarde en oxygène, en l’absence de processus athérothrombotique. L’objectif de ce travail était d’en décrire les principales étiologies, ainsi que les caractéristiques épidémiologiques, cliniques et pronostiques.Méthode : Les données des patients présentant un IDM de type 2 ont été recueillies à partir de l’observatoire des infarctus de Cote d’Or (RICO). Un travail complémentaire a analysé les données rétrospectives du service des urgences du Centre Hospitalier Universitaire (CHU) de Dijon BourgogneRésultats : Parmi 4436 patients consécutifs hospitalisés aux urgences du CHU pour IDM sur 3 ans, 947 (21%) présentaient un IDM de type 2 (âge médian : 81 ans). Dans l’observatoire RICO, 4572 patients consécutifs dont 862 (19%) IDM de type 2 ont été inclus sur 5 ans (âge médian : 77 ans). La mortalité intra-hospitalière des IDM de type 2 était de 14% parmi les patients des urgences et de 11% pour les patients du RICO. Les pathologies chroniques prédisposant à l’IDM de type 2 les plus fréquemment retrouvés étaient l’anémie sévère et le rétrécissement aortique serré. Une infection aigue, dans deux tiers des cas respiratoire, était retrouvée dans 10% de l’ensemble des IDM de la base RICO, représentant de loin le facteur précipitant le plus fréquent dans la genèse des IDM de type 2. Sur le plan thérapeutique, après ajustements sur scores de propension, la transfusion globulaire était associée à une réduction de la mortalité à un an pour les patients >80 ans avec un nadir d’hémoglobine ≤ 8 g/dL. L’angioplastie après IDM post-infectieux n’était pas associée à un meilleur pronostic qu’un traitement médicamenteux seul (mortalité à un an de 24% vs 19%, p = 0.5).Conclusion :L’IDM de type 2 est une pathologie sous-diagnostiquée, représentant 20% des IDM, et fréquente chez le sujet âgé. Elle est associée à un sur-risque de mortalité par rapport aux IDM de type 1. Les infections aigues, en particulier respiratoires, représentent le facteur déclenchant le plus fréquent. Sur la base de données observationnelles, l’angioplastie coronaire ne semble pas associée à une amélioration du pronostic
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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