@inproceedings{1968, abstract = {{Infrastructure as a Service providers use virtualization to abstract their hardware and to create a dynamic data center. Virtualization enables the consolidation of virtual machines as well as the migration of them to other hosts during runtime. Each provider has its own strategy to efficiently operate a data center. We present a rule based mapping algorithm for VMs, which is able to automatically adapt the mapping between VMs and physical hosts. It offers an interface where policies can be defined and combined in a generic way. The algorithm performs the initial mapping at request time as well as a remapping during runtime. It deals with policy and infrastructure changes. We extended the open source IaaS solution Eucalyptus and we evaluated it with typical policies: maximizing the compute performance and VM locality to achieve a high performance and minimizing energy consumption. The evaluation was done on state-of-the-art servers in our own data center and by simulations using a workload of the Parallel Workload Archive. The results show that our algorithm performs well in dynamic data centers environments.}}, author = {{Kleineweber, Christoph and Keller, Axel and Niehörster, Oliver and Brinkmann, André}}, booktitle = {{Proc. Int. Conf. on Parallel, Distributed and Network-Based Computing (PDP)}}, title = {{{Rule Based Mapping of Virtual Machines in Clouds}}}, doi = {{10.1109/PDP.2011.69}}, year = {{2011}}, } @article{1971, abstract = {{System virtualization has become the enabling technology to manage the increasing number of different applications inside data centers. The abstraction from the underlying hardware and the provision of multiple virtual machines (VM) on a single physical server have led to a consolidation and more efficient usage of physical servers. The abstraction from the hardware also eases the provision of applications on different data centers, as applied in several cloud computing environments. In this case, the application need not adapt to the environment of the cloud computing provider, but can travel around with its own VM image, including its own operating system and libraries. System virtualization and cloud computing could also be very attractive in the context of high‐performance computing (HPC). Today, HPC centers have to cope with both, the management of the infrastructure and also the applications. Virtualization technology would enable these centers to focus on the infrastructure, while the users, collaborating inside their virtual organizations (VOs), would be able to provide the software. Nevertheless, there seems to be a contradiction between HPC and cloud computing, as there are very few successful approaches to virtualize HPC centers. This work discusses the underlying reasons, including the management and performance, and presents solutions to overcome the contradiction, including a set of new libraries. The viability of the presented approach is shown based on evaluating a selected parallel, scientific application in a virtualized HPC environment. }}, author = {{Birkenheuer, Georg and Brinkmann, André and Kaiser, Jürgen and Keller, Axel and Keller, Matthias and Kleineweber, Christoph and Konersmann, Christoph and Niehörster, Oliver and Schäfer, Thorsten and Simon, Jens and Wilhelm, Maximilan}}, journal = {{Software: Practice and Experience}}, publisher = {{John Wiley & Sons}}, title = {{{Virtualized HPC: a contradiction in terms?}}}, doi = {{10.1002/spe.1055}}, year = {{2011}}, } @inproceedings{1972, abstract = {{We present a multi-agent system on top of the IaaS layer consisting of a scheduler agent and multiple worker agents. Each job is controlled by an autonomous worker agent, which is equipped with application specific knowledge (e.g., performance functions) allowing it to estimate the type and number of necessary resources. During runtime, the worker agent monitors the job and adapts its resources to ensure the specified quality of service - even in noisy clouds where the job instances are influenced by other jobs. All worker agents interact with the scheduler agent, which takes care of limited resources and does a cost-aware scheduling by assigning jobs to times with low energy costs. The whole architecture is self-optimizing and able to use public or private clouds.}}, author = {{Niehörster, Oliver and Keller, Axel and Brinkmann, André}}, booktitle = {{Proc. Int. Meeting of the IEEE Int. Symp. on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS)}}, title = {{{An Energy-Aware SaaS Stack}}}, doi = {{10.1109/MASCOTS.2011.52}}, year = {{2011}}, } @inproceedings{19845, abstract = {{In dieser Arbeit stellen wir ein flexibles System zur Entwicklung und Evaluation von 3-D-Renderingalgorithmen vor, das die Visualisierung komplexer virtueller Szenen auf einem breiten Spektrum an Geräten erlaubt. Die Aufbereitung und Echtzeitdarstellung solcher virtueller Szenen, wie sie beispielsweise aus detaillierten CAD-Daten erzeugt werden, stellt in vielerlei Hinsicht eine algorithmische und technische Herausforderung dar. Die 3-D-Szenendaten können nach dem Dateiimport aus einem Austauschformat in eine Vielzahl unterschiedlicher Datenstrukturen überführt werden. Es muss ein geeignetes Renderingverfahren ausgewählt und eingestellt werden, welches sowohl die Eigenschaften der Szene (Zahl der Polygone, Grad der Verdeckung etc.) als auch die Fähigkeiten der Hardware berücksichtigt. Auf der einen Seite stellt die Darstellung auf mobilen Endgeräten wie Smartphones besonders hohe Anforderungen aufgrund der Speicherbeschränkung und der geringen Leistungsfähigkeit der Grafikhardware. Auf der anderen Seite stehen bei Großprojektionssystemen, wie beispielsweise dem HD-Visualisierungscenter des Heinz Nixdorf Instituts, die hohe Bildqualität bei stereoskopischer Darstellung und die Unterstützung von Trackingsystemen im Vordergrund. Der Fokus des von uns entwickelten Systems PADrend liegt in der Bereitstellung einer flexiblen und leicht erweiterbaren Grundlage für die Entwicklung und Evaluation von 3-D-Renderingalgorithmen und räumlichen Datenstrukturen im Bereich der Forschung und der universitären Ausbildung. Durch den modularen Aufbau und die große Bandbreite an unterstützten Systemen wird gewährleistet, dass eine Vielzahl unterschiedlicher Entwicklungen und Anwendungen auf PADrend aufsetzen können. In diesem Artikel geben wir einen Überblick über den Aufbau und die Fähigkeiten des Systems. Des Weiteren geben wir ein Beispiel für ein Anwendungsszenario, in dem PADrend eingesetzt wird: die Visualisierung von architektonischen Modellen auf einem Multiprojektionssystem.}}, author = {{Jähn, Claudius and Petring, Ralf and Eikel, Benjamin}}, booktitle = {{Augmented & Virtual Reality in der Produktentstehung}}, pages = {{159----170}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{PADrend: Platform for Algorithm Development and Rendering}}}, volume = {{295}}, year = {{2011}}, } @inproceedings{19908, abstract = {{November 2011}}, author = {{Büker, Petra}}, title = {{{Heterogenität im Klassenzimmer. Herausforderungen für Lehrer/innenbildung und Praxis. Einführungsvortrag zum Praxistag: Interkulturelles Klassenmanagement des PLAZ sowie des Netzwerkes Lehrkräfte mit Zuwanderungsgeschichte NRW}}}, year = {{2011}}, } @inproceedings{19909, abstract = {{September 2011}}, author = {{Büker, Petra and Berning, Hanna}}, title = {{{Das Praxissemester in der Ausbildungsregion der Universität Paderborn. Vortrag im Rahmen des Symposions: Das neue Grundschullehramt in NRW an der 20. Jahrestagung der Kommission "Grundschulforschung und Pädagogik in der Primarstufe" der Deutschen Gesellschaft für Erziehungswissenschaft. Universität Paderborn}}}, year = {{2011}}, } @inproceedings{19910, abstract = {{September 2011}}, author = {{Büker, Petra and Hüpping, Birgit}}, title = {{{Sichtweisen, Handlungslogiken und Belastungserleben von Grundschullehrer/innen im Umgang mit kultureller Vielfalt: Forschungsbefunde aus der Paderborner Professionsstudie Pro-LEG. Vortrag an der 20. Jahrestagung der Kommission "Grundschulforschung und Pädagogik in der Primarstufe" der Deutschen Gesellschaft für Erziehungswissenschaft. Universität Paderborn}}}, year = {{2011}}, } @inproceedings{19911, abstract = {{September 2011}}, author = {{Büker, Petra and Bührmann, Thorsten and Kordulla, Agnes}}, title = {{{Schul- und Kindergartenentwicklung als neues interdisziplinäres Forschungsfeld: Methodologische Herausforderungen am Beispiel des Paderborner Modellprojektes "Kinderbildungshaus". Vortrag an der 20. Jahrestagung der Kommission "Grundschulforschung und Pädagogik der Primarstufe" der Deutschen Gesellschaft für Erziehungswissenschaften. Universität Paderborn}}}, year = {{2011}}, } @inproceedings{19913, abstract = {{September 2011}}, author = {{Büker, Petra and Kordulla, Agnes and Bunte, Nicola}}, title = {{{Lernen in multiprofessionellen Teams - Integrierte Praxisforschung im Paderborner Modellprojekt "Kinderbildungshaus". Vortrag an der Jahrestagung des Nordverbunds Schulbegleitforschung an der Universität Paderborn}}}, year = {{2011}}, } @inproceedings{20180, abstract = {{The challenging scientific field of self-reconfiguring modular robotics (i.e., decentrally controlled 'super-robots' based on autonomous, interacting robot modules with variable morphologies) calls for novel paradigms of designing robot controllers. One option is the approach of evolutionary robotics. In this approach, the challenge is to achieve high evaluation numbers with the available resources which may even affect the feasibility of this approach. Simulations are usually applied at least in a preliminary stage of research to support controller design. However, even simulations are computationally expensive which gets even more burdensome once comprehensive studies and comparisons between different controller designs and approaches have to be done. Hence, a benchmark with low computational cost is needed that still contains the typical challenges of decentral control, is comparable, and easily manageable. We propose such a benchmark and report an empirical study of its characteristics including the transition from the single-robot setting to the multi-robot setting, typical local optima, and properties of adaptive walks through the fitness landscape.}}, author = {{Hamann, Heiko and Schmickl, Thomas and Crailsheim, Karl and Krasnogor, Natalio and Luca Lanzi, Pier}}, booktitle = {{Proceedings of the 13th Annual Genetic and Evolutionary Computation Conference, GECCO 2011}}, pages = {{195----202}}, title = {{{Coupled inverted pendulums: A benchmark for evolving decentral controllers in modular robotics}}}, doi = {{10.1145/2001576.2001604}}, year = {{2011}}, } @inproceedings{20181, abstract = {{The current definitions of emergence have no effects in the context of artificial life that could convincingly be called `constructive'. They are rather descriptive labels or tests. In order to get towards recipes of generating emergence we need to know systemic characteristics that help during the design phase of artificial life systems and worlds. In this paper, we develop and discuss five hypotheses that are not meant to be irrevocable but rather thought-provoking. We introduce two modeling approaches for Langton's ant to clarify these hypotheses. Then we discuss general properties of systems, such as (ir-)reversibility, dependence on initial states, computation, discreetness, and undecidable properties of system states.}}, author = {{Hamann, Heiko and Schmickl, Thomas and Crailsheim, Karl}}, booktitle = {{IEEE Symposium on Artificial Life (IEEE ALIFE 2011)}}, pages = {{62----69}}, title = {{{Thermodynamics of Emergence: Langton's Ant Meets Boltzmann}}}, doi = {{10.1109/ALIFE.2011.5954660}}, year = {{2011}}, } @inproceedings{20183, author = {{Hamann, Heiko and Schmickl, Thomas and Crailsheim, Karl}}, booktitle = {{10th European Conference on Artificial Life (ECAL'09)}}, isbn = {{9783642212826}}, issn = {{0302-9743}}, pages = {{442----449}}, title = {{{Evolving for Creativity: Maximizing Complexity in a Self-organized Multi-particle System}}}, doi = {{10.1007/978-3-642-21283-3_55}}, volume = {{5777}}, year = {{2011}}, } @inproceedings{20184, author = {{Hamann, Heiko and Schmickl, Thomas and Stradner, Jürgen and Crailsheim, Karl and Thenius, Rona and Fitch, Robert}}, booktitle = {{Robotic Organisms: Artificial Homeostatic Hormone System and Virtual Embryogenesis as Examples}}, title = {{{Robotic Organisms: Artificial Homeostatic Hormone System and Virtual Embryogenesis as Examples for Adaptive Reaction-Diffusion Controllers}}}, year = {{2011}}, } @article{2019, author = {{Krimphove, Dieter}}, journal = {{Zeitschrift für das gesamte Genossenschaftswesen ZFgG }}, number = {{Bd. 61. Heft 1}}, pages = {{45 – 59}}, publisher = {{Lucius & Lucius}}, title = {{{Die Europäische Genossenschaft (SCE) auf dem Prüfstand }}}, year = {{2011}}, } @inbook{20193, author = {{Hamann, Heiko and Schmickl, Thomas}}, booktitle = {{Bio-inspired Computing and Communication Networks}}, editor = {{Xiao, Yang}}, publisher = {{CRC Press}}, title = {{{{BEECLUST}: {A} Swarm Algorithm Derived from Honeybees}}}, year = {{2011}}, } @inproceedings{20194, author = {{Hamann, Heiko and Karsai, Istvan and Schmickl, Thomas and Stradner, Jürgen and Crailsheim, Karl and Thenius, Ronald and Kampis, Gyoergy and Szathmary, Eoers}}, booktitle = {{Advances in Artificial Life, 10th European Conference, ECAL 2009}}, pages = {{132----139}}, title = {{{Evolving a novel bio-inspired controller in reconfigurable robots}}}, year = {{2011}}, } @inproceedings{20195, author = {{Hamann, Heiko and Schmickl, Thomas and Crailsheim, Karl and Thenius, Ronald and Kengyel, Daniela}}, booktitle = {{10th European Conference on Artificial Life (ECAL'09)}}, title = {{{Embodiment of Honeybee's Thermotaxis in a Mobile Robot Swarm}}}, doi = {{10.1007/978-3-642-21314-4_9}}, year = {{2011}}, } @inbook{20196, author = {{Hamann, Heiko and Schmickl, Thomas and Crailsheim, Karl}}, booktitle = {{Advances in Artificial Life, ECAL 2011: Proceedings of the 11th European Conference on the Synthesis and Simulation of Living Systems}}, editor = {{Lenaerts, Tom and Giacobini, Mario and Bersini, Hugues and Bourgine, Paul and Dorigo, Marco and Doursat, Rene}}, pages = {{302----309}}, publisher = {{MIT Press}}, title = {{{Explaining Emergent Behavior in a Swarm System Based on an Inversion of the Fluctuation Theorem}}}, year = {{2011}}, } @inbook{20214, author = {{Hamann, Heiko and Schmickl, Thomas and Stradner, Jürgen and Crailsheim, Karl and Winkler, Lutz}}, booktitle = {{New Horizons in Evolutionary Robotics}}, publisher = {{Springer}}, title = {{{Major Feedback Loops Supporting Artificial Evolution in Multi-modular Robotics}}}, doi = {{10.1007/978-3-642-18272-3_13}}, year = {{2011}}, } @article{20215, author = {{Schmickl, Thomas and Hamann, Heiko and Crailsheim, Karl}}, issn = {{1387-3954}}, journal = {{Mathematical and Computer Modelling of Dynamical Systems}}, number = {{3}}, pages = {{221--242}}, title = {{{Modelling a hormone-inspired controller for individual- and multi-modular robotic systems}}}, doi = {{10.1080/13873954.2011.557862}}, volume = {{17}}, year = {{2011}}, }