1,720,961 research outputs found
On the use of behavioural equivalences for web services' development
No full textWeb services are emerging as a promising technology for the development of next generation distributed heterogeneous software systems. We define a new behavioural equivalence for Web services, based on bisimilarity and inspired by recent advances in the theory of reactive systems. The equivalence is compositional and decidable, and it provides a firm ground for enhanced behaviour-aware discovery and for a sound incremental development of services and service compositions
A net-based approach to Web services publication and replaceability
No full textWeb services represent a promising technology for the development of distributed heterogeneous software systems. In this setting, a major issue is to establish whether two services can be used interchangeably in any context. To this aim, our paper first briefly reviews the results contained in a recent article by the same authors, where a suitable notion of behavioural equivalence for Web services was introduced. Our work then extends those results, in order to account for ontologybased service specifications. Next, a concrete example scenario - a car rental system - is presented, and it is then used to illustrate how the equivalence between services can be fruitfully employed for correctly addressing two prominent, modularity-related problems: the publication of correct service specifications and the replaceability of (sub)services
A behavioural congruence for web services
No full textWeb services are emerging as a promising technology for the development of next generation distributed heterogeneous software systems. We define a new behavioural equivalence for Web services, based on bisimilarity and inspired by recent advances in the theory of reactive systems. The proposed equivalence is compositional and decidable, and it provides a firm ground for enhanced behaviour-aware discovery and for a sound incremental development of services and service compositions
Compositional Specification of Web Services via Behavioural Equivalence of Nets: A Case Study
No full textWeb services represent a promising technology for the development of distributed heterogeneous software systems. In this setting, a major issue is to establish whether two services can be used interchangeably in any context. This paper illustrates - through a concrete scenario from banking systems - how a suitable notion of behavioural equivalence over Petri nets can be effectively employed for checking the correctness of service specifications and the replaceability of (sub)services
A comprehensive framework for the analysis of automotive systems
No full textAnalysis models, technologies and tools are extensively used in the automotive domain to validate and optimize the design and implementation of SW systems. This is especially true for modern systems including advanced autonomous (and complex) features. The range of analysis methods that can be applied is extremely wide and goes from functional correctness to functional safety to timing (and schedulability), security, and possibly even more. The AUTOSAR automotive standard has been defined with the purpose of standardizing the SW architecture of automotive systems and enable the construction of systems by composing SW components that are portable and abstract with respect to the underlying HW/SW platform. However, AUTOSAR was originally developed with portability of code in mind, and even if it quickly evolved to include a system-level modeling language (with its metamodel) and later extensions to deal with the needs of analysis methods (and tools), it is hardly comprehensive and still affected by several omissions and limitations. To fix the limitations with respect to timing and schedulability analysis Bosch developed the Amalthea (later App4MC) metamodel and tools. In Huawei, a more general (and ambitious) approach was undertaken to support not only timing analysis, but also model checking (or other types of formal verification), safety analysis and even design optimization. The approach is based on the concepts of a unified (modular) metamodel and a framework based on Eclipse to integrate analysis methods and tools. In this paper we describe the framework and the results obtained with respect to the objectives of functional verification and timing analysis
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
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