1,720,955 research outputs found
Automated Translation of Event-B Models to SPARK Proof Annotations
No full textEnsuring and verifying the properties of safety- and security-critical software is paramount. Event-B is a modelling language which enables the design ofsystems, using mathematical proofs ensuring the conformity of the system todeclared safety requirements. SPARK is a programming language making use of static analysis tools which verify written code correctly implements the properties of the system as specified in the form of written proof annotations. SPARK has been used in many industry-scale projects to implement safety-critical software.Manually writing SPARK proof annotations can be time-consuming and tedious. The aim of this project was to create a tool, in the form of a Rodin plug-in, to translate an Event-B model into a set of SPARK specifications in a SPARK specification file, in the form of proof annotations and other structures, from which SPARK code written can be verified together with, hence ensuring the correct behaviour of the software. A background literature review was conducted to find related works, to help guide the approach to this project. The common forms of a lot of predicates in Event-B, such as those involving set operations, had no direct counterpart in SPARK. Hence, an extra file in SPARK containing function definitions for common Event-B predicates was written. Using these function definitions, a set of translation rules from Event-B predicates to SPARK code was compiled, along with other translation rules for the making of other SPARK constructs which were needed in the specification file. Using these conceptual rules, the plug-in was created in Eclipse as an Eclipse plug-in to run on the Rodin target platform. Finally, this plug-in was tested with several Event-B models to ensure that the generated code was the same as the expected code
Dataset for "Towards Generating SPARK from Event-B Models"
No full textDataset supports: Sritharan, S & Hoang, TS 2020, Generating SPARK from Event-B Models. in Proceedings of the 16th International Conference on integrated Formal Methods. The 16th International Conference on integrated Formal Methods, Lugano, Switzerland, 16/11/20.</span
Towards generating SPARK from Event-B models
No full textThis paper presents an approach to generate SPARK code from Event-B models. System models in Event-B are translated into SPARK packages including proof annotations. Properties of the Event-B models such as axioms and invariants are also translated and embedded in the resulting models as pre- and post-conditions. This helps with generating SPARK proof annotations automatically hence ensuring the correct behaviour of the resulting code. A prototype plug-in for the Rodin has been developed and the approach is evaluated on different examples. We also discuss the possible extensions including to generate scheduled code and data structures such as records
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
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
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