Crowdsourced knowledge catalyzes software development (Extended abstract)

No abstract

Who’s who on Gnome mailing lists : identity merging on a large data set

No abstract

Who’s who on Gnome mailing lists : identity merging on a large data set

No abstract

Similar tasks, different effort : Why the same amount of functionality requires different development effort?

Since the appearance of Albrechts pioneering work, function points have attracted signi¿cant attention from the industry. In their work, project managers can benchmark function point counts obtained for their projects against large publicly available datasets such as the ISBSG development & enhancement repository release 11, containing function point counts for more than 5000 projects. Unfortunately, larger amount of functionality as re¿ected in the function points count does not necessarily correspond to a more signi¿cant development effort. In this paper we focus on a collection of ISBSG projects with a similar amount of functionality and study the impact of different project attributes on the development effort

Comparative study of software metrics' aggregation techniques

While software metrics are commonly used to assess software maintainability and study software evolution, they are usually defined on a micro-level (method, class, package). Metrics should therefore be aggregated in order to provide insights in the evolution at the macro-level (system). In addition to traditional aggregation techniques such as the mean, recently econometric aggregation techniques such as the Gini index and the Theil index have been proposed. Advantages and disadvantages of different aggregation techniques have not been evaluated empirically so far. In this paper we present the preliminary results of the comparative study of different aggregation techniques

By no means : a study on aggregating software metrics

Fault prediction models usually employ software metrics which were previously shown to be a strong predictor for defects, e.g., SLOC. However, metrics are usually defined on a microlevel (method, class, package), and should therefore be aggregated in order to provide insights in the evolution at the macro-level (system). In addition to traditional aggregation techniques such as the mean, median, or sum, recently econometric aggregation techniques, such as the Gini, Theil, and Hoover indices have been proposed. In this paper we wish to understand whether the aggregation technique influences the presence and strength of the relation between SLOC and defects. Our results indicate that correlation is not strong, and is influenced by the aggregation technique

Four-dimensional ultrafast electron microscopy of phase transitions

Reported here is direct imaging (and diffraction) by using 4D ultrafast electron microscopy (UEM) with combined spatial and temporal resolutions. In the first phase of UEM, it was possible to obtain snapshot images by using timed, single-electron packets; each packet is free of space–charge effects. Here, we demonstrate the ability to obtain sequences of snapshots ("movies") with atomic-scale spatial resolution and ultrashort temporal resolution. Specifically, it is shown that ultrafast metal–insulator phase transitions can be studied with these achieved spatial and temporal resolutions. The diffraction (atomic scale) and images (nanometer scale) we obtained manifest the structural phase transition with its characteristic hysteresis, and the time scale involved (100 fs) is now studied by directly monitoring coordinates of the atoms themselves

EFFECT OF LEVELLING ON THE ENERGY BALANCE OF MAIZE CROP FOR GRAINS

        Maize is recognized as a plant that greatly harnesses the allocated factors-the insurance with water and mineral fertilization-, bringing a substantial energy intake especially in the context of rational crop revolutions. From the point of view of fertilization, maize producing a large amount of plant substance at the surface unit, consumes high amounts of the main nutrients, which is a plant ,, voracious by excellence "and which responds promt to applied, but necessary water should be ensured at the appropriate time. The energy analysis in the case of maize for grains has shown high energy values produced in both cases concerning the location of culture-non-ivelate and even on ground level

Going farther together:the impact of social capital on sustained participation in open source

Sustained participation by contributors in open-source software is critical to the survival of open-source projects and can provide career advancement benefits to individual contributors. However, not all contributors reap the benefits of open-source participation fully, with prior work showing that women are particularly underrepresented and at higher risk of disengagement. While many barriers to participation in open-source have been documented in the literature, relatively little is known about how the social networks that open-source contributors form impact their chances of long-term engagement. In this paper we report on a mixed-methods empirical study of the role of social capital (i.e., the resources people can gain from their social connections) for sustained participation by women and men in open-source GitHub projects. After combining survival analysis on a large, longitudinal data set with insights derived from a user survey, we confirm that while social capital is beneficial for prolonged engagement for both genders, women are at disadvantage in teams lacking diversity in expertise.\u3cbr/\u3