1,720,981 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
Flexible employee scheduling in the context of the Port of Beirut
No full textThesis (M.S.)--American University of Beirut, Department of Computer Science, 2012.Advisor : Dr. George Turkiyyah, Professor, Department of Computer Science ; Co-Advisor : Dr. F. Jordan Srour, Visiting Assistant Professor, Department of Computer Science--Committee Members : Dr. Paul Attie, Professor, Department of Computer Science ; Dr. Wassim El Hajj, Assistant Professor, Department of Computer Science.Includes bibliographical references (leaves 90-94)Employee scheduling, the process of methodically assigning employees to work hours, has been studied in many different areas and can originally be traced back to work on traffic delays at toll booths. Given the large number of application areas and the important economic impact of the scheduling problem, many different approaches to scheduling have been studied and a host of terminologies have emerged to specify the particularities of each approach. We propose in this work a two-phase employee scheduling algorithm designed for the busy context of a port. Constraining our problem only with Labor law requirements and health and safety measures, we seek to generate flexible schedules that minimize the idle hours of the employees while covering demand
Cholesterol and LDL receptors in ubiquinone treated primary hepatocytes and HepG2 cells -
Get PDFThesis. M.Sc. American University of Beirut. Department of Biochemistry and Molecular Genetics 2014. W 4 R564ch 2014Advisor: Dr. Julnar Usta, Professor, Department of Biochemistry and Molecular Genetics ; Co-advisor: Dr. Pascale Karam, Assistant Professor, Department of pediatrics and Adolescent Medicine, AUBMC- Associate-Department of Biochemistry and Molecular Genetics, AUB; Committee members: Dr. Firas Kobeissy, Assistant Professor, Department of Biochemistry and Molecular Genetics.Includes bibliographical references (leaves 72-83)Cholesterol is a vital component of cell membranes and a precursor of many biomolecules: cholesterol esters, steroid hormones and bile acids. Its synthesis involves the intermediate mevalonic acid (MVA) which serves also as a precursor for isoprenoids, dolichol and ubiquinone (UQ). UQ is a lipid soluble molecule that mediates the transfer of electrons in the respiratory chain. The role of its antioxidant property in enhancing mitochondrial function and in reducing LDL oxidation has been reported. In this study, we investigate the possible role of UQ in regulating MVA pathway and subsequently cholesterol level. Two types of ubiquinones were used UQ1 and the naturally occurring UQ10. Isolated rat primary rat hepatocytes and HepG2 were pre-treated with UQ1 (25 and 50 µM) and UQ10 (50µM) followed by addition of 2-14C MVA (for 24 hours), bypassing thus the HMGCoA reductase catalyzed step. Lipids were then extracted (Bligh and Dyer), evaporated, and separated by Thin Layer Chromatography using Heptane-Ethyl acetate as solvent system. The radioactivity incorporated into each of cholesterol, lanosterol, squalene and UQ10 was counted (Cpm) and were normalized to inorganic phosphate. Expression of LDL receptor in UQ1 and UQ10 treated cells was also examined using immuno-staining and western blotting. The effect of different inhibitors of MVA pathway in the presence or absence of UQ1-UQ10 was also examined. These include HMGCoA Reductase (Statin-50µM); Farnesyl-geranylgeranyl transferase (FPT-I-47µM); 4-hydroxybenzoate polyprenyl transferase (Bacitracin-50µM). Our results showed a significant decrease in the radioactivity incorporated into cholesterol in both UQ1 and UQ10 treated cells, whereas it increased in lanosterol and squalene. UQ1 exhibited a more potent effect than UQ10 while it increased the incorporation of radioactivity in UQ10. Level of labeled cholesterol did not change in mevastatin treated primary hepatocytes while it decreased in HepG2 treated cells. Mevastatin co-treatment w
Introduction to the Blockchain
No full textPrésentation à ISIS Castres (Ecole d'ingénieurs « Informatique et Systèmes d'information pour la santé »
Introduction to the Blockchain
No full textPrésentation à ISIS Castres (Ecole d'ingénieurs « Informatique et Systèmes d'information pour la santé »
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
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