1,723,434 research outputs found
Seconde nozze e identità materna nella Firenze del tardo Medioevo,
No full textS. Seidel Menchi, A. Jacobson Schutte, Th. KuehnInternational audienc
A Jacobson-radikál
No full textDolgozatomban az absztrakt algebra egy fontos fogalmával, a Jacobson-radikállal és annak alkalmazásaival, speciális eseteivel foglalkoztam. A célom az volt, hogy a különböző gyűrűk Jacobson-radikálját jellemezzem, illetve megmutassam ezen Jacobson-radikálok közötti különbségeket, hasonlóságokat.
Emellett szerettem volna általánosabb képet festeni erről az algebrai fogalomról, ugyanis a Jacobson-radikált általában csak egységelemes algebrai struktúrákban vizsgáltuk. Mivel azonban a legtöbb esetben az egységelemes és a nemegységelemes eset között csak formális különbségek adódtak, így arra törekedtem, hogy ahol lehetséges, mindkét esetet az olvasó elé tárjam.
A dolgozat első fejezetében általában a gyűrűket, a másodikban a modulusokat vizsgáljuk. Szót ejtünk több ismert algebrai tételről, mint például a Wedderburn-Artin tételről, vagy Jacobson sűrűségi tételéről.
Szakdolgozatom alapját Jacobson 1945-ben megjelent cikke adja. Mivel a cikk már közel hetven éves, így nyelvezete kissé nehezen érthető, jelölései és fogalmi rendszere több helyen megújításra szorult.
Dolgozatom legfőbb célja eme mély eredményeket tartalmazó cikk modern köntösbe való átültetése.gjMatematikaBSc/B
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
Tecniques: recent developments in computer aided engineering of GPCR ligands using the human A3 adenosine receptor as an example.
No full textG-protein-coupled receptors (GPCRs) represent the largest known family of signal-transducing molecules, and convey signals for light and many extracellular regulatory molecules. GPCRs are dysfunctional or dysregulated in several human diseases and are estimated to be the targets of O40% of the drugs used in clinical medicine today. The crystal structure of rhodopsin provides the first information on the three-dimensional structure of GPCRs, which now supports homology modeling studies and structure-based drug-design approaches
Recent development on computer aided engineering of GPCR ligands: the human A3 adenosine receptors as an example.
No full textG-protein-coupled receptors (GPCRs) represent the largest known family of signal-transducing molecules, and convey signals for light and many extracellular regulatory molecules. GPCRs are dysfunctional or dysregulated in several human diseases and are estimated to be the targets of >40% of the drugs used in clinical medicine today. The crystal structure of rhodopsin provides the first information on the three-dimensional structure of GPCRs, which now supports homology modeling studies and structure-based drug-design approaches. In this article, we review recent work on adenosine receptors, a family of GPCRs, and, in particular, on adenosine A(3) receptor antagonists. We focus on an iterative, bi-directional approach in which models are used to generate hypotheses that are tested by experimentation; the experimental findings are, in turn, used to refine the model. The success of this approach is due to the synergistic interaction between theory and experimentation
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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