1,721,070 research outputs found
Modelli dinamici delle richieste di manutenzione
No full textThe dynamic evolution of ecological systems in which predators and preys compete for surviving has been investigated by applying suitable mathematical models. This kind of mathematical framework has been shown to be suited to describe evolution of economical systems as well, where instead of predators and preys there are consumers and resources.
This paper suggests how dynamic systems could be usefully applied to maintenance context, namely to model the dynamic evolution of maintenance effort. When maintainers stats trying to recognize and correct code defects, while the number of residual defects decreases, the effort spent to find out any new defect has an initial increase, followed by a decline, in a similar way as preys and predators populations do.
The feasibility of this approach is supported by experimental data about a 67 months maintenance task of a software project and its successive release
Modeling Maintenance Effort by means of Dynamics Systems
No full textThe dynamic evolution of ecological systems in which predators and preys compete for surviving has been investigated by applying suitable mathematical models. Dynamic systems theory provides a useful way to model interspecie competition and thus the evolution of predators and preys populations. This kind of mathematical framework has been shown to be well suited to describe evolution of economical systems as well, where instead of predators and preys there are consumers and resources.
This paper suggests how dynamic systems could be usefully applied to maintenance context, namely to model the dynamic evolution of maintenance effort. When maintainers starts trying to recognize and correct code defects, while the number of residual defects decreases, the effort spent to find out any new defect has an initial increase, followed by a decline, in a similar way as preys and predators populations do.
The feasibility of this approach is supported by the experimental data about a 67 months maintenance task of a software project and its successive release
Impact of Function Pointers on the Call Graph
No full textMaintenance activities are made more difficult when pointers are heavily used in source code. the programmer needs to build a mental model of memory locations and of the way they are accessed by means of pointers, in order to comprehend the functionalities of the system.
Although several points-to analysis algorithms have been proposed in literature to provide information about memory locations referenced by pointers, there are no quantitative evaluations of the impact of pointers on the overall program understanding activities.
Program comprehension activities are usually supported by tools, providing suitable views of the source program. One of the most widely used code views is the Call Graph, a graph representing calls between functions in the given program. Unfortunately, when pointers, and especially function pointers, are heavily used in the code, the extracted call graph is highly inaccurate and thus of little usage, if a points-to analysis is not preliminarly performed.
In this paper we will address the problem of evaluating the impact of pointers analysis on the Call Graph. The results, obtained on a set of real world programs, provide a quantitative evaluation and show the key role of pointer analysis in Call Graph constructio
Dynamic Model for Maintenance and Testing Effort
No full textThe dynamic evolution of ecological systems in which predators and preys compete for surviving has been investigated by applying suitable mathematical models. Dynamic systems theory provides a useful way to model interspecie competition and thus the evolution of predators and preys populations. This kind of mathematical framework has been shown to be well suited to describe evolution of economical systems as well, where instead of predators and preys there are consumers and resources.
Maintenance and testing activities absorb the most relevant part of total life-cycle cost of software. Such economic relevance strongly suggests to investigate the maintenance and testing processes in order to find new models allowing software engineers to better estimate, plan and manage costs and activities. In this paper we show how dynamic systems theory could be usefully applied to maintenance and testing context, namely to model the dynamic evolution of the effort. When programmers start trying to recognize and correct code defects, while the number of residual defects decreases, the effort spent to find out any new defect has an initial increase, followed by a decline, in a similar way as preys and predators populations do. The flexibility of this approach is supported by the experimental data about two real world software project
Maintenance and Testing Effort Modelled by Linear and Non Linear Dynamic Systems
No full textThe dynamic evolution of ecological systems in which predators and prey compete for surviving has been investigated by applying suitable mathematical models. Dynamic systems theory provides a useful way to model interspecies competition and thus the evolution of predators and prey populations. This kind of mathematical framework has been shown to be well suited to describe evolution of economical systems as well, where instead of predators and prey there are consumers and resources
Maintenance and testing activities absorb the most relevant part of total lifecycle cost of software. Such economic relevance strongly suggests to investigate the maintenance and testing processes in order to find new models allowing software engineers to better estimate, plan and manage costs and activities. In this paper we show how dynamic systems theory could be usefully applied to the maintenance and testing context, namely to model the dynamic evolution of the effort. When programmers start trying to recognize and correct code defects, while the numbers of residual defects decreases, the effort spent to find out any new defect has an initial increase, followed by a decline, in a similar way as prey and predators populations do.
The feasibility of this approach is supported by the experimental data about two real world software project
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
Chronic nasal obstruction secondary to perinatal listeriosis
No full textPerinatal listeriosis has not been reported previously as a cause of chronic nasal obstruction. We describe a preterm infant with early-onset neonatal listeriosis in whom the suppurative inflammation of the nasal cavities was complicated by total and irreversible airway obstruction
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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