@article{SeppTempelGramannetal.2011,
  author    = {Sepp, T. and Tempel, E. and Gramann, M. and Nurmi, P. and Haupt, Michael},
  title     = {Studying the patterns of the universe},
  series = {Baltic astronomy},
  volume    = {20},
  journal   = {Baltic astronomy},
  number    = {2},
  publisher = {Institute of Theoretical Physics and Astronomy},
  address   = {Moletai},
  issn      = {1392-0049},
  pages     = {309 -- 312},
  year      = {2011},
  abstract  = {The SDSS galaxy catalog is one of the best databases for galaxy distribution studies. The SDSS DR8 data is used to construct the galaxy cluster catalog. We construct the clusters from the calculated luminosity density field and identify denser regions. Around these peak regions we construct galaxy clusters. Another interesting question in cosmology is how observable galaxy structures are connected to underlying dark matter distribution. To study this we compare the SDSS DR7 galaxy group catalog with galaxy groups obtained from the semi-analytical Millennium N-Body simulation. Specifically, we compare the group richness, virial radius, maximum separation and velocity dispersion distributions and find a relatively good agreement between the mock catalog and observations. This strongly supports the idea, that the dark matter distribution and galaxies in the semi-analytical models and observations are very closely linked.},
  language  = {en}
}
@article{HirschfeldPerscheidHaupt2012,
  author    = {Hirschfeld, Robert and Perscheid, Michael and Haupt, Michael},
  title     = {Explicit use-case representation in object-oriented programming languages},
  series = {ACM SIGPLAN notices},
  volume    = {47},
  journal   = {ACM SIGPLAN notices},
  number    = {2},
  publisher = {Association for Computing Machinery},
  address   = {New York},
  issn      = {0362-1340},
  doi       = {10.1145/2168696.2047856},
  pages     = {51 -- 60},
  year      = {2012},
  abstract  = {Use-cases are considered an integral part of most contemporary development processes since they describe a software system's expected behavior from the perspective of its prospective users. However, the presence of and traceability to use-cases is increasingly lost in later more code-centric development activities. Use-cases, being well-encapsulated at the level of requirements descriptions, eventually lead to crosscutting concerns in system design and source code. Tracing which parts of the system contribute to which use-cases is therefore hard and so limits understandability. In this paper, we propose an approach to making use-cases first-class entities in both the programming language and the runtime environment. Having use-cases present in the code and the running system will allow developers, maintainers, and operators to easily associate their units of work with what matters to the users. We suggest the combination of use-cases, acceptance tests, and dynamic analysis to automatically associate source code with use-cases. We present UseCasePy, an implementation of our approach to use-case-centered development in Python, and its application to the Django Web framework.},
  language  = {en}
}
@article{HauptAdamsTimbermontetal.2009,
  author    = {Haupt, Michael and Adams, Bram and Timbermont, Stijn and Gibbs, Celina and Coady, Yvonne and Hirschfeld, Robert},
  title     = {Disentangling virtual machine architecture},
  issn      = {1751-8806},
  doi       = {10.1049/iet-sen.2007.0121},
  year      = {2009},
  abstract  = {Virtual machine (VM) implementations are made of intricately intertwined subsystems, interacting largely through implicit dependencies. As the degree of crosscutting present in VMs is very high, VM implementations exhibit significant internal complexity. This study proposes an architecture approach for VMs that regards a VM as a composite of service modules coordinated through explicit bidirectional interfaces. Aspect-oriented programming techniques are used to establish these interfaces, to coordinate module interaction, and to declaratively express concrete VM architectures. A VM architecture description language is presented in a case study, illustrating the application of the proposed architectural principles.},
  language  = {en}
}