1,721,040 research outputs found
RELAXED UTILITY MAXIMIZATION IN COMPLETE MARKETS
No full textFor a relaxed investor-one whose relative risk aversion vanishes as wealth becomes large-the utility maximization problem may not have a solution in the classical sense of an optimal payoff represented by a random variable. This nonexistence puzzle was discovered by Kramkov and Schachermayer (1999), who introduced thereasonable asymptotic elasticitycondition to exclude such situations. Utility maximization becomes well posed again representing payoffs as measures on the sample space, including those allocations singular with respect to the physical probability. The expected utility of such allocations is understood as the maximal utility of its approximations with classical payoffs-the relaxed expected utility. This paper decomposes relaxed expected utility into its classical and singular parts, represents the singular part in integral form, and proves the existence of optimal solutions for the utility maximization problem,withoutconditions on the asymptotic elasticity. Key to this result is the Polish space structure assumed on the sample space
[Complications of the treatment with long-acting neuroleptic preparations. Brain disease due to fluphenazine decanoate].
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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
La classificazione delle frasi subordinate consecutive con antecedente nella tradizione grammaticale russa: problemi e proposte
No full textNelle principali grammatiche russe le subordinate consecutive con antecedente della tradizione italiana come “Bylo tak žarko, čto trudno bylo dyšat’” (“Era così caldo che si faceva fatica a respirare”) non sono descritte sotto un’unica denominazione e negli anni, con l’applicazione di approcci diversi, queste strutture sono state classificate in modo differente.
Nel contributo vengono prese in rassegna le classificazioni delle frasi subordinate consecutive con antecedente offerte dalle diverse descrizioni grammaticali russe, mettendo in evidenza alcune incongruenze e proponendo una classificazione basata sulla struttura semantico-concettuale espressa da questi costrutti.
Si tratta di una relazione transfrastica caratterizzata dall’idea che l’effetto ha luogo quando l’intensità della causa raggiunge una certa soglia e che, una volta superato questo limite, l’effetto è inevitabile. Queste due componenti non possono essere inferite e sono indissociabili dalla codifica linguistica, ossia dalla presenza di un intensificatore come “così”; per questo nel caso delle consecutive si può parlare di ipercodifica.
Un approccio che parta dalle forme di espressione e si focalizzi su un determinato antecedente o sulla congiunzione o sulla struttura correlativa in generale finisce per coinvolgere anche tipi di relazioni diverse dalla consecutività, come la comparazione di analogia e la comparazione di grado. Invece, una volta descritto il tipo di relazione codificato, è possibile individuare, sia in russo che in italiano, altri mezzi di espressione della consecutività rispetto a quelli tradizionalmente considerati. Un esempio è costituito dai costrutti italiani con "da" (“Piove da non poter uscire”) e dalla forma nominale introdotta dalla preposizione “fino” in italiano e dalla preposizione “do” in russo, spesso preceduta da un verbo intensificato con il prefisso “do-“ e il suffisso” –sja” (“dokričat’sja do chripoty”, “gridare fino alla raucedine”).
Attraverso l’analisi contrastiva è possibile poi studiare eventuali differenze nell’uso dei mezzi linguistici per l’espressione della consecutività in russo e in italiano. Ad esempio, si può ipotizzare che nel russo parlato siano più frequenti che in italiano costruzioni con antecedente ma prive di congiunzione, che mantengano l’ordine causa-conseguenza (“Komnatka takaja – tol’ko krovat’ vlezala”, “Una stanzetta tale – ci entrava solo un letto”). La frequente presenza di strutture asindetiche confermerebbe la tendenza del russo rispetto all’italiano a una maggiore diffusione della paratassi, già evidenziata per la codifica della relazione transfrastica di tipo finale.
Una descrizione basata sulla definizione della relazione semantico-concettuale e sulla successiva individuazione delle forme di cui il parlante dispone per esprimerla trova importanti applicazioni nell’ambito della didattica della traduzione e del russo come lingua straniera
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