1,720,969 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
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
Afectació respiratòria en la camptocòrmia
No full textLa camptocòrmia és una malaltia neurològica molt infreqüent de la que fins ara es desconeixien les seves implicacions a nivell respiratori. En el nostre estudi, hem pogut observar una elevada prevalença d’alteracions espiromètriques i gasomètriques que en un 46% dels casos eren moderades o greus. Aquests trastorns també s’observaven durant la nit en forma d’hipoventilació alveolar. Tots aquests trastorns eren més greus en els malalts diagnosticats de camptocòrmies secundàries que en pacients amb distròfia aïllada de la línia mitja
Influencia de las fugas intencionales en la monitorización del volumen tidal en ventilación mecànica no invasiva
No full textLa modalitat més utilitzada en ventilació mecànica no invasiva es la pressió de suport (Ps) amb tubuladura única i sistemes de fuita controlada mitjançant una vàlvula espiratòria. En el nostre estudi avaluem la influència que l’increment d’aquestes fuites pot tenir en el càlcul del volum tidal (VT) per part del software dels ventiladors comercials. Els resultats mostren que el software dels ventiladors infravalora el VT real que rep el pacient. Aixó pot comportar que, almenys en alguns casos, en la pràctica clínica s’utilitzin valors de Ps superiors als necessaris quina cosa podria comportar un cert grau d’hiperinsuflació pulmonar.La modalidad más utilizada en ventilación mecánica no invasiva es la presión de soporte (Ps) con tubuladura única y sistemas de fuga controlada mediante una válvula espiratoria. En el presente estudio evaluamos la influencia que el incremento de estas fugas puede tener sobre el cálculo del volumen tidal (VT) por el software de los ventiladores comerciales. Los resultados muestran que el software de los ventiladores infravalora el VT real que recibe el paciente. Esto puede comportar que, al menos en algunos casos, en la práctica clínica se utilicen valores de Ps superiores a los necesarios y se produzca un cierto grado de hiperinsuflación pulmonar
Valor discriminatori de la mesura de la diferència de potencial nasal per valorar la funció de la proteïna reguladora de la conductància transmembrana de la fibrosi quística pel diagnòstic etiològic de malalts amb bronquièctasis difuses
Full text linkIntroducció: Avui en dia, el diagnòstic de FQ es basa fonamentalment en la prova de la suor i l’estudi de les mutacions CFTR. Les formes no clàssiques i les formes monosimptomátiques de FQ com les bronquièctasi poden tenir una prova de la suor normal o dubtosa i una o cap mutació de la CFTR. Per poder realitzar el diagnòstic de FQ en aquests malalts, s’aconsella utilitzar una prova funcional de la CFTR que demostri “in vivo” de manera fiable el funcionament de la CFTR. La prova descrita darrerament i més fiable es la mesura de la diferència de potencial nasal (DPN).
Objectius: s’han dividit en dos grans grups. En primer lloc establir els criteris de formació d’un tècnic, constatar la repetibilitat de la prova, determinar la sensibilitat (S), especificitat (E), valor predictiu positiu (VPP) i valor predictiu negatiu (VPN), establir i determinar els valors de referència en el nostra medi. El següent gran objectiu es establir si la DPN pot confirmar o excloure el diagnòstic de FQ o disfunció de CFTR en els malalts amb bronquièctasis difuses i prova de la suor no patològica i si la DPN basal pot ser útil com a prova de cribratge en pacient s amb bronquièctasi difuses.
Material i Mètodes
Poblacions estudiades: Controls sans no portadors de mutacions CFTR; Fibròtics quístics (FQ clàssica); Pacients adults amb bronquièctasis ; Individus sans portadors d’una mutació de CFTR. Instrumentalització: prova de la suor, mesura de la diferència de potencial nasal (basal i després de la irrigació amb diferents solucions- amilorida, solució lliure de clor i isoproterenol), estudi genètic.
Resultats: població: es varen estudiar respectivament 14, 17, 112 i 30 individus
Primer estudi: El nostre tècnic ha fet 352 determinacions; repetibilitat de la tècnica: s’ha obtingut un coeficient de correlació intraclasse de 0.857. Comparant amb la prova de la suor, la DPN va mostrar una S: 91.7%; E: 80%; VPP: 78%; VPN: 92,3% i es van establir els valors de referència pel nostre laboratori. L’estudi de la DPN (basal més irrigació amb les diferents solucions) va mostrar que la darrera mesura, després de la irrigació amb isoproterenol un increment de DPN entre 1 i 11 mV,permetia diagnosticar de FQ malalts amb BD i prova de la suor no patològica. Un 82% d’aquests malalts tenien mutacions considerades de menor severitat.
Conclusions: Hem comprovat que un tècnic que relaitzi 350 mesures està ensinistrat per fer la tècnica. La repetibilitat de la tècnica fou excel·lent, la qual cosa permet establir valors de referència per un laboratori en concret. La determinació de la DPN en pacients afectes de BD no filiades permet el diagnòstic de FQ. Els nostres resultats aconsellen la implementació de la mesura de la DPN basal en el algoritme diagnòstic de la FQ.Introduction: nowadays, the diagnosis of Cystic Fibrosis (CF) is based on the sweat test and the presence of characteristic mutations. Non classical forms as well as monosymptomatic patients of CF such as difuse bronchiectasis can have a sweat test normal or mildly altered and one or none mutation of the CFTR (Cystic Fibrosis Transmembrane Regulator) gen. To achieve a diagnosis of CF, a functional test that shows “in vivo” the activity of the CFTR is recommended. The most recent and reliable test implemented is the measurement of the nasal potential difference (NPD).
Objectives: they were divided into two groups. The first one pretended to establish the criteria for the training of a technician to state the repeatability of the test, determine the sensitivity (S), specificity (E), positive predictive value (PPV), negative predictive value (NPV) and establish the reference values of the technique in our environment. The second objective was to evaluate whether the NPD meaurement can confirm or exclude the diagnosis of CF and/or CFTR dysfunction in patients with diffuse bronchiectasis and normal sweat test as well as to establish its usefulness as a screening test in patients with diffuse bronchiectasis.
Material and Methods:
Population: controls healthy without any mutation of the CFTR; Classic CF (carrying two CFTR mutations); Adult patients with diffuse bronchiectasis; Healthy individuals carrying a mutation of CFTR.
Interventions: sweat test, measurement of nasal potential difference (baseline and after irrigation with different solutions: amiloride, chlorine-free solution and isoproterenol), genetic study.
Results: population: 14, 17, 112 and 30 individuals were respectively studied. First study: Our technician performed 352 determinations; Repeatability of the technique: an intraclass correlation coefficient (ICC) of 0.857 was obtained. Comparing with the sweat test, the DPN showed a S: 91.7%; E: 80%; PPV: 78%; NPV92.3%. We could establish the reference values of the NPD technique for our laboratory. Second study: the different NPD measurements (the baseline and those obtained after irrigation with different solutions) showed that the last measurement, the one obtained after irrigation with isoproterenol, in the group of patients with and increment of NPD values between 1 and 11 mV allowed a diagnosis of CF in patients with diffuse brionchiectasis and a normal sweat test. Eighty two percent of this group of patients had CFTR mutations, most of which considered of less severity.
Conclusions: We have found that a technician training is achieved after 350 NPD measurements. The repeatability of the technique was excellent, allowing to establish reference values for a particular laboratory. The measurement of NPD in patients with diffuse bronquiectasis allows a diagnosis of CF. Our results recommend the implementation of the NPD measurement for the diagnosis of CF
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