Fraunhofer-Institut für Angewandte Informationstechnik FIT

Filters

37
36 31 31 11
37
Reset filters

Settings
Now showing 1 - 10 of 37
  • Publication
    View-based near real-time collaborative modeling for information systems engineering
    ( 2016)
    Nicolaescu, P.
    ;
    Rosenstengel, M.
    ;
    Derntl, M.
    ;
    Klamma, R.
    ;
    Jarke, M.
    Conceptual modeling is a creative, social process that is driven by the views of involved stakeholders. However, few systems offer view-based conceptual modeling on the Web using lock-free synchronous collaborative editing mechanisms. Based on a (meta-)modeling framework that supports near real-time collaborative modeling and metamodeling in the Web browser, this paper proposes an exploratory approach for collaboratively defining views and viewpoints on conceptual models. Viewpoints are defined on the metamodeling layer and instantiated as views within a model editor instance. The approach was successfully used for various conceptual modeling languages and it is based on user requirements for model-based creation and generation of nextgeneration community applications. An end-user evaluation showed the usefulness, usability and limitations of view-based collaborative modeling.
  • Publication
    A longitudinal study of community-oriented open source software development
    ( 2016)
    Neulinger, K.
    ;
    Hannemann, A.
    ;
    Klamma, R.
    ;
    Jarke, M.
    End-users are often argued to be the source of innovation in Open Source Software (OSS). However, most of the existing empirical studies about OSS projects have been restricted to developer subcommunities only. In this paper, we address the question, if and under which conditions the requirements and ideas from end-users indeed influence the development processes in OSS. We present an approach for automated requirements elicitation process discovery in OSS communities. The empirical basis are three large-scale interdisciplinary OSS projects in bioinformatics, focusing on communication in the mailing lists and source code histories over ten years. Our study results in preliminary guidelines for the organization of community-oriented software development.
  • Publication
    Learn-as-you-go: new ways of cloud-based micro-learning for the mobile web
    ( 2011)
    Kovachev, D.
    ;
    Cao, Y.
    ;
    Klamma, R.
    ;
    Jarke, M.
  • Publication
    Causal vs. effectual behavior- support for entrepreneurs
    ( 2011)
    Schlüter, J.
    ;
    Schmitz, D.
    ;
    Brettel, M.
    ;
    Jarke, M.
    ;
    Klamma, R.
    "Effectuation" is a new approach to explain the success or failure of entrepreneurs. In contrast to the traditional "causation" approach the entrepreneur is not considered to be driven by a concrete goal and to choose between different alternatives in regard to how well they help to achieve this goal. Instead the entrepreneur evaluates the alternatives, in particular the choice of strategic partners, in regard to their potential for future success. The goals are adapted to the choices and in particular the needs of the strategic partners. Agent-based simulations are intended to help identifying the settings where one approach is more appropriate than the other.
  • Publication
    Well-balanced usability & annotation complexity in interactive video semantization
    ( 2010)
    Renzel, D.
    ;
    Jarke, M.
    ;
    Klamma, R.
    ;
    Lottko, M.
    ;
    Toubekis, G.
    ;
    Jansen, M.
    In the recent years more and more people have begun to edit video files, as technologies are becoming more sophisticated and affordable. Web 2.0 has raised tagging functionality to a growing number of websites such as Flickr and YouTube. However, these services only provide basic video annotation support. In comparison to those well-known services there are many research efforts towards video semantization tools. These tools provide highly precise annotation functionality based on metadata standards such as MPEG-7, but tend to exhibit very complex user interfaces. In this paper we present the design, implementation and evaluation of SeViAnno, an MPEG-7 based interactive semantic video annotation Web platform with the main objective to find a well-balanced trade-off between a simple user interface and video semantization complexity.
  • Publication
    Early experiences with responsive open learning environments
    ( 2010)
    Wolpers, M.
    ;
    Ullrich, C.
    ;
    Renzel, D.
    ;
    Friedrich, M.
    ;
    Klamma, R.
  • Publication
    Mobile access to MPEG-7 based multimedia services
    ( 2009)
    Cao, Y.
    ;
    Jarke, M.
    ;
    Klamma, R.
    ;
    Mendoza, O.
    ;
    Srirama, S.
    Multimedia information systems have been developed into service-ware. With the paradigms of web services, service oriented architectures (SOA), and Web 2.0 widgets, multimedia has become truly ubiquitous. However, interoperability, scalability, reliability and security are arising challenges at mobile multimedia service development. This paper focuses on the analysis, design, development and evaluation of a middleware that allows access from mobile devices to a bundle of multimedia services. The services are based on the international multimedia metadata description standard MPEG-7. The implementation is based on new generation of service-oriented application servers called Lightweight Application Server (LAS). Mobile web services refer to the fact that mobile servers host web services. A prototype was developed as a proof of concept, showing how to access MPEG-7 based multimedia services from a Mobile Host and the analysis results of providing MPEG-7 based multimedia services in the form of web services from the Mobile Host to other mobile devices. An alternative solution is to apply enterprise service bus technology as the middleware. The performance evaluation results of both approaches show the reliable accessibility of MPEG-7 based multimedia services via the enterprise service bus solution.
  • Publication
    A Web 2.0 personal learning environment for classical Chinese poetry
    ( 2009)
    Cao, Y.
    ;
    Klamma, R.
    ;
    Gao, Y.
    ;
    Lau, R.W.H.
    ;
    Jarke, M.
  • Publication
    Knowledge multimedia processing in technology enhanced learning
    ( 2009)
    Klamma, R.
    ;
    Spaniol, M.
    ;
    Jarke, M.