1,720,990 research outputs found
A Model-based approach to performance and reliability prediction
Full text linkI sistemi software moderni sono sempre più complessi e sempre più costosi da realizzare in termini di tempo e risorse. I requisiti funzionali non sono le uniche cose da considerare quando si sviluppa il progetto di un sistema software. Proprio per questi motivi è fondamentale poter conoscere in fase di design se i requisiti di qualità del software potranno essere soddisfatti o meno; questo può evitare costosi rimaneggiamenti del progetto o addirittura clamorosi fallimenti. In questo lavoro ci concentreremo sulla valutazione del raggiungimento dei requisiti di performance e reliability già in fase di design. Il problema a tal proposito sta nel fatto che spesso i progettisti software non hanno le competenze necessarie per applicare i modelli di valutazione di performance e reliability che sono piuttosto distanti dai tipici modelli di design. Per risolvere questo problema faremo uso di tecniche di MDA per introdurre uno step intermedio tra modelli di design e modelli di analisi della qualità del software. In particolare presenteremo KLAPER, un linguaggio intermedio utilizzato per trasformazioni tra modelli di natura diversa; spiegheremo quali sono i vantaggi introdotti da un approccio di tipo model driven e presenteremo una semantica formale (tramite ASM) del meta modello KLAPER. Inoltre descriveremo anche degli esempi di trasformazione verso alcuni modelli di performance (LQN, SimJava) e reliability (SimJava, DTMC) basati su linguaggio QVT e presenteremo un tipico caso di utilizzo del tool realizzato in ambiente Eclipse per la gestione delle trasformazioni KLAPER.Modern software systems are increasingly complex and expensive in terms of time and resources. Functional requirement are not the only things to keep in mind when a software system is developed. For these reasons it is essential to know during the design phase if software quality requirements can be achived; this can avoid expensive rehandling of the project or even sensational failures. In this work we will concentrate on the evaluation of the fulfilment of performance and reliability requirements already at the design phase. The problem is that often software engineers don't have the required knowledge to apply performance and reliability evaluation models that are quite distant from tipical design models. To solve this problem we will use some MDA techniques to add an intermediate step between design models and software quality analisys models. In particular we will present KLAPER, an intermediate language used for transformations between models of different nature; we will explain which are the advantages of this model driven approach and we will present a formal semantics (using ASM) of the KLAPER meta model. Moreover we will describe some typical examples of transformation towards some performance models (LQN, SimJava) and towards some reliability models (SimJava, DTMC) done using a QVT like language and we will present a typical use case of the tool realized, for the Eclipse environment, to handle all these KLAPER transformations
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
Pericolosità geomorfologica in aree a valenza turistica: il tratto di costa tra Punta Monesteroli e Punta Persico (Liguria orientale)
No full textkoamabayili/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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