DigitalElektrotechnik und MedientechnikZeitschriftenartikel
H. Meer, C. Linnhoff-Popien, M. Beck, Andreas Fischer, J. Botero
Distributed and scalable embedding of virtual networks
Journal of Network and Computer Applications, vol. 56, no. October, pp. 124-136
2015
DOI: 10.1016/j.jnca.2015.06.012
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Abstract Network virtualization is widely regarded as a key technology for the Future Internet, enabling the deployment of new network protocols without changing dissimilar hardware devices. This leads to the problem of mapping virtual demands to physical resources, known as Virtual Network Embedding (VNE). Current VNE algorithms do not scale with respect to the substrate network size. Therefore, these algorithms are not applicable in large-scale scenarios where virtual networks have to be embedded in a timely manner. This paper discusses DPVNE, a Distributed and Generic VNE framework: It runs cost-oriented centralized embedding algorithms in a distributed way, spreading workload across the substrate network instead of concentrating it on one single node (as centralized algorithms do). Several state-of-the-art algorithms were evaluated running inside the DPVNE framework. Results show that DPVNE leads to runtime improvements in large-scale scenarios and embedding results are kept comparable.
Angewandte WirtschaftswissenschaftenZeitschriftenartikel
K. Bengler, Armin Eichinger, J. Beck
Trait, State or Artefact? Assessing Experts' Regulatory Focus in Nuclear Power Plant Control
Cognition, Technology & Work, vol. 16, no. 4, pp. 531-539
2014
DOI: 10.1007/s10111-014-0283-1
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We apply the theory of regulatory focus in the field of nuclear power plant (NPP) control. The first pilot study was conducted at the German simulator centre for NPPs. Here, we tested the influence of accident training lessons on the experts’ regulatory focus. In a second study, we tested and validated two chronically regulatory focus questionnaires to decide which measurement would be more suitable for future research. The Work Regulatory Focus scale was translated into German, and the Regulatory Concerns Questionnaire was adapted to a work environment. The combined evidence of both studies shows that the regulatory focus of the experts does not change during the training lessons. Study 2 shows that both questionnaires were able to adequately measure the regulatory focus, but that they produce artificially contradictory outcomes that could be misleading. Recommendations and considerations for using the questionnaires are provided. Theoretical and practical implications on the influence of experts’ regulatory focus on working and decision-making behaviour using standard procedures in NPP control are given.
DigitalElektrotechnik und MedientechnikZeitschriftenartikel
H. Meer, X. Hesselbach, Michael Beck, Andreas Fischer, J. Botero
Virtual Network Embedding: A Survey
IEEE Communications Surveys and Tutorials, vol. 15, no. 4, pp. 1888-1906
2013
DOI: 10.1109/SURV.2013.013013.00155
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Network virtualization is recognized as an enabling technology for the future Internet. It aims to overcome the resistance of the current Internet to architectural change. Application of this technology relies on algorithms that can instantiate virtualized networks on a substrate infrastructure, optimizing the layout for service-relevant metrics. This class of algorithms is commonly known as “Virtual Network Embedding (VNE)” algorithms. This paper presents a survey of current research in the VNE area. Based upon a novel classification scheme for VNE algorithms a taxonomy of current approaches to the VNE problem is provided and opportunities for further research are discussed.
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