Auflistung nach Autor:in "Scholtes, Ingo"
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- KonferenzbeitragAutomated software remodularization based on move refactoring - A complex systems approach(Software-engineering and management 2015, 2015) Scholtes, Ingo; Zanetti, Marcelo Serrano; Tessone, Claudio Juan; Schweitzer, FrankModular design is a desirable characteristic that fosters the comprehensibility and thus maintainability of software systems. While many software systems are initially created in a modular way, over time modularity typically degrades. In our work, we propose an automated strategy to remodularize software based on move refactorings, i.e. moving classes between packages without changing other aspects of the source code. Taking a complex systems perspective, our approach applies network theory to the dynamics of software dependency structures. Drawing inspiration from statistical physics, we use the Potts Spin Model and turn it into a stochastic remodularization algorithm which is based on probabilistically moving classes between modules. We test our method on 39 open source JAVA software projects. Comparing the modular structure produced by developers with that optimized by our algorithm, we find that our method is able to improve modularity by an average of $166 \pm 77$ percent. Our work highlights the potential of interdisciplinary applications of methods from the statistical physics perspective on complex systems to software engineering.
- KonferenzbeitragCategorizing bugs with social networks: A case study on four Open Source software communities(Software Engineering 2014, 2014) Scholtes, Ingo; Serrano Zanetti, Marcelo; Tessone, Claudio Juan
- KonferenzbeitragCrePes - Warum und wie Schüler ab 8 Jahren Programmieren lernen sollten(DeLFI 2008: Die 6. e-Learning Fachtagung Informatik, 2008) Esch, Markus; Gratz, Patrick; Rothkugel, Steffen; Jakoby, Jörg; Scholtes, Ingo; Sturm, PeterIn diesem Artikel beschreiben wir eine komfortable und kindgerechte Lernumgebung welche den Erwerb grundlegender Programmierfertigkeiten unterstützt. Diese ist auf der Grundlage mehrjähriger Erfahrungen in der Vermittlung mathematischlogischer sowie programmiertechnischer Konzepte an Schüler im Alter zwischen 8 und 13 Jahren innerhalb unserer Arbeitsgruppen entstanden. Neben einer Beschreibung einiger, der Software zugrunde liegender Konzepte berichten wir zudem von unseren Erfahrungen in deren Einsatz in unterschiedlichsten Lernsituationen.
- KonferenzbeitragData Science(INFORMATIK 2019: 50 Jahre Gesellschaft für Informatik – Informatik für Gesellschaft, 2019) Scholtes, Ingo; Strohmaier, Markus
- ReportEmpfehlungen für Masterstudiengänge „Data Science“ – auf Basis eines Bachelors in (Wirtschafts-)Informatik oder Mathematik(2021) Abedjan, Ziawasch; Bendig, Thomas; Brefeld, Ulf; Bürkle, Joachim; Desel, Jörg; Edlich, Stefan; Eppler, Thomas; Goedicke, Michael; Hachmeister, Nils; Heidrich, Jens; Höppner, Stephan; Kast, Stefan M.; Krupka, Daniel; Lang, Klaus; Liggesmeyer, Peter; Meisner, Julia; Scholtes, Ingo; Tropmann-Frick, Marina
- KonferenzbeitragFrom aristotle to ringelmann: A large-scale analysis of team productivity and coordination in open source software projects(Software Engineering 2016, 2016) Scholtes, Ingo; Mavrodiev, Pavlin; Schweitzer, FrankThe productivity of software development teams, i.e., how their size relates to their output, is an important question for project management. Most studies suggest that teams become less productive as they grow larger, a phenomenon paraphrased as Brooks' law in software engineering and as Ringelmann effect in social psychology. Conversely, a recent study suggests that the productivity of teams in OSS projects increases as they grow larger. Attributing it to synergetic effects, this was linked to the Aristotelian quote that “the whole is more than the sum of its parts”. Using data on 58 OSS projects with 580 000 commits by 30 000 developers, we perform a large-scale analysis of , , productivity in development teams. We confirm the negative relation previously found by software engineering research, providing quantitative evidence for the Ringelmann effect. Taking a network perspective on developer-code associations, we investigate mechanism behind this effect and show that the magnitude of the productivity decrease is related to the growth dynamics of coordination networks. Most of today's software projects are so complex that they cannot be developed by a single person, instead requiring large teams of collaborating developers. This necessity of large teams raises a simple, yet important question: How productive is a team of developers compared to a single developer? Or, in other words: How much time do n developers need to finish a project compared to the time taken by a single developer? This question is of significant importance not only for project management but also for the development of cost estimation models for software engineering processes. One may naively assume that the productivity of individual team members is additive, i.e., that, compared to the time taken by n developers will speed up the development time by a factor of n. However, this misses out two important factors that can give rise to a nonadditive scaling of productivity. First, the collaboration of developers in a team can give rise to synergy effects, which result in the team being more productive than one would expect from adding up individual productivities of its members. Under this assumption, the average output per team member can be increased by adding developers to the team, a fact that has recently been related to Aristotle's quote that “the whole is more than the sum of its parts” [SMG14]. A second, contrary factor that influences the productivity of developer teams is the communication and coordination overhead which is likely to increase as teams grow larger. In particular, this can lead to situations where the average output per team member decreases as the size of the team is increased. Studies showing that growing team sizes negatively affect productivity can be traced back to early studies of Maximilian Ringelmann [Ri13]. In the context of software engineering, it can be related
- Konferenzbeitraggit2net: Mining Time-Stamped Co-Editing Networks from Large git Repositories(INFORMATIK 2019: 50 Jahre Gesellschaft für Informatik – Informatik für Gesellschaft, 2019) Gote, Christoph; Scholtes, Ingo; Schweitzer, Frank
- ZeitschriftenartikelOrganic Design of Massively Distributed Systems: A Complex Networks Perspective(Informatik-Spektrum: Vol. 35, No. 2, 2012) Scholtes, Ingo; Tessone, Claudio JuanThe vision of Organic Computing addresses challenges that arise in the design of future information systems that are comprised of numerous, heterogeneous, resource-constrained and error-prone components. The notion organic highlights the idea that, in order to be manageable, such systems should exhibit self-organization, self-adaptation and self-healing characteristics similar to those of biological systems. In recent years, the principles underlying these characteristics are increasingly being investigated from the perspective of complex systems science, particularly using the conceptual framework of statistical physics and statistical mechanics. In this article, we review some of the interesting relations between statistical physics and networked systems and discuss applications in the engineering of organic overlay networks with predictable macroscopic properties.
- KonferenzbeitragResilience in enterprise social networks(INFORMATIK 2013 – Informatik angepasst an Mensch, Organisation und Umwelt, 2013) Burger, Valentin; Hossfeld, Tobias; Garcia, David; Seufert, Michael; Scholtes, Ingo; Hock, DavidThe goal of human resource management is to ensure an effective company environment. Crucial for a good corporate culture is a comfortable atmosphere and positive social relationships between the employees. The interactions of the people and groups working in the company define their relationships and are reflected in the company's social network. Projections of such networks are Enterprise Social Networks which are more and more integrated in companies. These social networks can be a powerful tool to analyse the structure of a company and indicate potential problems. This extended abstract poses research questions to identify and quantify mechanisms that have an impact on the social network of a company to ensure resilience. To address these questions we make assumptions based on real-world observations for a subsequent model.
- KonferenzbeitragThe social dimension of information ranking: A discussion of research challenges and approaches(INFORMATIK 2013 – Informatik angepasst an Mensch, Organisation und Umwelt, 2013) Scholtes, Ingo; Pfitzner, René; Schweitzer, FrankThe extraction of relevant knowledge from the increasingly large amount of information available in information repositories is one of the big challenges of our time. Although it is clear that the social and the information layer of collaborative knowledge spaces like the World Wide Web (WWW), scholarly publication databases or Online Social Networks (OSNs) are inherently coupled and thus inseparable, the question how the ranking and retrieval of information is influenced by the structure and dynamics of the social systems that create it has been addressed at most partially. In this talk, we will highlight associated research questions and challenges from an ethical, social and computer science perspective and introduce a multiplex network perspective that integrates both the social and the semantic layer of social information systems.