1,721,049 research outputs found
A Dual Language Approach Extension to UML for the Development of Time-Critical Component-Based Systems
No full textAbstractA “dual language” component-based approach to the development of real-time critical applications is proposed. UML provides the constructs for modeling the structure of the system and the behavior of the system's components. A new descriptive language based on temporal logic, called OTL (Object Temporal Logic) is defined, in order to let the developer assert properties of the system at an abstract specification level. A development process consistent with the proposed notation is also briefly described
Validating timing requirements for time basic net specifications
No full textThis article deals with the validation of formal requirement specifications of real-time systems. Formally specified requirements can be validated by both direct execution and by proving properties at the specification level. We first discuss how the timing characteristics of a system can be specified by a formalism based on high-level Petri nets. Then we show how its temporal properties can be proven by means of a symbolic execution-based proof method for time reachability analysis. Depending on the complexity of the model of the specified system, the method may contain some undecidable steps and require interaction with the user. In many practical cases, however, the method can be performed mechanically and has acceptable response times
Generating functional test cases in-the-large for time-critical systems from logic-based specifications
No full textWe address the problem of generating functional test cases for complex, highly structured time-critical systems starting from a modularized logic-based specification written in the TRIO+ language, an object-oriented extension of the temporal logic TRIO.First, we present methods for producing test cases for a TRIO+ specification module, referring both to the internal, hidden, portion of the module and to its interface. Then, we discuss criteria to be used in the construction of test cases from a TRIO+ specification based on its composing modules and the connections among their interfaces. We formally define the notions related to test case derivation from TRIO+ modules and we introduce an executable language for describing a variety of strategies for constructing test cases for structured TRIO+ specifications starting from (parts of) the test cases of the composing modules. This language can be the basis for the implementation of an interactive tool for the semiautomatic construction of functional test cases from complex time-critical systems starting from their TRIO+ specification
A Dual Language Approach to the Development of Time-Critical Systems with UML
No full textDeveloping time-critical systems requires expressive, rigorous, easy to use notations to describe the time-related features of the systems, in a way that is formal enough to support and automate activities like property verification and test case generation. We propose a dual-language approach provided with a descriptive formalism for specifying the properties of a system and its components in addition to the typical UML (and UML-RT) diagrams. This description consists of a formula of a new logic, called OTL (Object Temporal Logic), which is an extension of OCL. The approach is applied to a case study derived from the authors’ industrial experiences
Courses for software professionals as two-way communication channels between academia and industry
No full textThis paper summarizes some of the lessons learned by the author in teaching courses for software professionals. These classes' primary objective is to provide participants with
knowledge about some software engineering methods and techniques. We summarize some advice on how to build and deliver these classes. In addition, these courses are also a good two-way communication channel between academia and industry, since the instructors can get good insights into current practices and future trends. So, these courses help bridge the gap between Academia and Industry in both education and research
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
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