1,720,971 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
Creation of an Autonomous, Fluorescence-Based Tissue Diagnostic and Ablation Device for use in Brain Tumor Resection
No full textPhysical resection of tumors is a crucial component of the treatment of brain tumors. Traditionally, a multi-faceted approach involving resection as well as chemotherapy and radiation provide the backbone for most modern brain tumor treatment strategies. The process of tumor location and removal routinely involves the use of a number of sensory modalities (such as pre-operative MRIs and CT scans) and manual resection tools (such as electrocautery and forceps). Unfortunately, this current paradigm offers hurdles that stand in the way of more precise, accurate tumor resection. These hurdles include the physical phenomenon of brain shift and the natural limitation of the human hand placement in surgery. Due to the well documented relationship between extent of resection of brain tumor and survivability, there is a need to overcome these hurdles for more precise surgical resection. This dissertation presents a device that aims to increase the accuracy and precision of tumor removal surgery. This integrated system involves a non-contact laser induced fluorescence device, called the TumorID, and the previously documented TumorCNC. The TumorID utilizes a 405 nm laser to induce fluorescence that is collected by the device and quantified by an attached CCD spectrometer. The quantified spectral data is passed to a trained classifier that classifies the data as healthy or tumorous. The designation is passed to the TumorCNC. Based on the designation and sensory data, the TumorCNC generates an ablation path and removes tissue using a CO2 laser. The TumorID is capable of classifying melanoma brain metastasis, glioma, and healthy tissue with 100% accuracy based on ex vivo mouse brain tissue. The total integrated system is capable of ablating the boundary of a tumor mimicking tissue phantom with a RMSE of 1.69 mm. Therefore, on average for the entire tumor boundary, the device only deviates from the actual tumor boundary by approximately 1.5 mm. Reports have indicated that human surgeons can achieve accuracy on the order of approximately 0.3 mm. Therefore, the system is still short of the reported accuracy of a human surgeon. However, future research steps include the incorporation of a more sophisticated search strategy, implementation of a classifier that utilizes the boundary as a class in the mutli-class classifier, and decreasing the spot size of the CO2 laser. All of these potential avenues have the potential to increase the accuracy and precision of the tumor removal abilities of the non-contact, integrated system.</p
Development of a catheter stabilization device for stent placement aid
No full textThe purpose of this research is to introduce a novel device to intracranial flow-diverting stent delivery in endovascular neurosurgery to limit, and potentially eliminate, issues associated with instability upon stent delivery. Precisely, the goal of the device is to initiate a friction force between the delivery system and the arterial vessel wall to both assure immediate stent deployment and prevent axial advancement of the stent-anchoring wire. A prototype was constructed and its effectiveness of applying a friction force to a vessel wall was tested ex vivo using an LRX Plus Materials Testing Machine. Afterwards, the experimental performance of the device was compared to that of a finite element simulated model. The device demonstrated the ability to apply a friction force to the vessel wall to meet its objective. However, experimental values were consistently greater than those gathered from the simulation. Since the force prescribed by the device is minimal, future work includes increasing the force capabilities of the device and defining force requirements. Upon further development and testing, this device can be implemented into endovascular neurosurgery to improve occlusion rates of intracranial aneurysms and reduce patient risk during these operations.</p
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
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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