1,720,959 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
Numerical modeling of blood flow in prosthetic heart valves and cardiovascular pathologies
Get PDFDespite the many advances in our understanding of cardiovascular diseases and how to diagnose and treat them, they are still the leading cause of death and disability in the Western World. Onset and progression of these diseases is due to interplay between pathologic flow conditions and vessel remodeling altering vessel geometries and composition. Advances in numerical simulation techniques and improvements in computational power have opened new avenues to investigate challenging pathological flow problems that underlie and characterize cardiovascular diseases. Mechanical heart valves (MHV) represent pathologic flow conditions common in cardiovascular prosthetic devices. Those result in platelet damage leading to thrombus formation and thromboembolism, which are major impidients to these devices. Numerical simulations were conducted to study platelet damage resulting by pathological flow patterns. The simulations included unsteady Reynolds averaged Navier Stoke (URANUS) and highly resolved direct numerical simulations (DNS) formulations. The thrombogenic potential of different MHV designs was evaluated from the sum of the product of stress and exposure time, determining platelet stress accumulation. Platelet cumulative damage due to repeated passages through the valve was also studied. Vulnerable plaques (VP) and abdominal aortic aneurysms (AAA) are examples of cardiovascular diseases that are driven by pathologic vessel geometries and compositions and compromised hemodynamics. Blood vessel integrity disruption and rupture in these diseases can lead to stroke, heart attack, and death. Numerical studies of their rupture risk was based on incorporating anisotropic vessel tissue material properties, and inclusion of calcification and intraluminal thrombus in patient specific geometries extracted from clinical imaging modalities, using fluid structure interaction (FSI) simulations to examine risk of rupture due to the contribution stresses and vessel tissue deformation.Advanced numerical tools that were developed and employed to study the conditions present in pathological blood vessels and in flows through prosthetic heart valves PHV are presented. These studies tackle highly complex cardiovascular disease processes using sophisticated engineering tools, adding to our understanding of biomechanical problems characterized by the interaction of blood flow with cardiovascular devices and pathological vessel geometries. This can aid optimizing the design of future cardiovascular devices and to augment clinical diagnostics of cardiovascular pathologies
Numerical modeling of blood flow in prosthetic heart valves and cardiovascular pathologies
No full textDespite the many advances in our understanding of cardiovascular diseases and how to diagnose and treat them, they are still the leading cause of death and disability in the Western World. Onset and progression of these diseases is due to interplay between pathologic flow conditions and vessel remodeling altering vessel geometries and composition. Advances in numerical simulation techniques and improvements in computational power have opened new avenues to investigate challenging pathological flow problems that underlie and characterize cardiovascular diseases. Mechanical heart valves (MHV) represent pathologic flow conditions common in cardiovascular prosthetic devices. Those result in platelet damage leading to thrombus formation and thromboembolism, which are major impidients to these devices. Numerical simulations were conducted to study platelet damage resulting by pathological flow patterns. The simulations included unsteady Reynolds averaged Navier Stoke (URANUS) and highly resolved direct numerical simulations (DNS) formulations. The thrombogenic potential of different MHV designs was evaluated from the sum of the product of stress and exposure time, determining platelet stress accumulation. Platelet cumulative damage due to repeated passages through the valve was also studied. Vulnerable plaques (VP) and abdominal aortic aneurysms (AAA) are examples of cardiovascular diseases that are driven by pathologic vessel geometries and compositions and compromised hemodynamics. Blood vessel integrity disruption and rupture in these diseases can lead to stroke, heart attack, and death. Numerical studies of their rupture risk was based on incorporating anisotropic vessel tissue material properties, and inclusion of calcification and intraluminal thrombus in patient specific geometries extracted from clinical imaging modalities, using fluid structure interaction (FSI) simulations to examine risk of rupture due to the contribution stresses and vessel tissue deformation.Advanced numerical tools that were developed and employed to study the conditions present in pathological blood vessels and in flows through prosthetic heart valves PHV are presented. These studies tackle highly complex cardiovascular disease processes using sophisticated engineering tools, adding to our understanding of biomechanical problems characterized by the interaction of blood flow with cardiovascular devices and pathological vessel geometries. This can aid optimizing the design of future cardiovascular devices and to augment clinical diagnostics of cardiovascular pathologies.Advisor(s): Danny Bluestein. Committee Member(s): Yi-Xian Qin; Shmuel Einav; Yuefan Deng.Stony Brook University Libraries. SBU Graduate School in Department of Biomedical Engineering. Lawrence Martin (Dean of Graduate School)
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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