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Vartziotis D.,National Technical University of Athens | Vartziotis D.,NIKI Ltd. Digital Engineering | Vartziotis D.,TWT GmbH Science and Innovation | Papadrakakis M.,National Technical University of Athens
Computer Assisted Mechanics and Engineering Sciences | Year: 2013

Mesh smoothing improves mesh quality by node relocation without altering mesh topology. Such methods play a vital role in finite element mesh improvement with a direct consequence on the quality of the discretized solution. In this work, an improved version of the recently proposed geometric element trans- formation method (GETMe) for mesh smoothing is presented. Key feature is the introduction of adaptive concepts, which improve the resulting mesh quality, reduce the number of parameters, and enhance the parallelization capabilities. Implementational aspects are discussed and results of a more efficient version are presented, which demonstrate that GETMe adaptive smoothing yields high quality meshes, is par- ticularly fast, and has a comparably low memory profile. Furthermore, results are compared to those of other state of the art smoothing methods. Copyright © 2013 by Institute of Fundamental Technological Research, Polish Academy of Sciences.

Hetterich J.,Luneburg University | Bonnemeier S.,TWT GmbH Science and Innovation | Pritzke M.,Institute of Business Administration | Georgiadis A.,Luneburg University
Journal of Environmental Planning and Management | Year: 2012

There are several motives for the adoption of 'green' or sustainable materials for car interiors, for example, the shortage of fossil resources and the resulting oil-price increase, new legal requirements (regulations and laws) which penalise environmental pollution and the changing behaviour patterns of consumers. The latter was the subject of an empirical study involving 106 potential car buyers, who were asked about their attitude to sustainable materials in a car interior. Furthermore, consumers' willingness to pay a premium price for a vehicle interior made of renewable resources was also analysed. The main conclusion is that more than 66% of the respondents would accept green car components for a moderate price increase. The relevance and pressure to substitute fossil materials with renewable ones can be expected to increase. This increase will not only be due to the potential decline of resources, but more notably as a result of consumer demand. © 2012 Copyright Taylor and Francis Group, LLC.

Vartziotis D.,National Technical University of Athens | Vartziotis D.,NIKI Ltd. Digital Engineering | Vartziotis D.,TWT GmbH Science and Innovation | Wipper J.,TWT GmbH Science and Innovation
Computer Methods in Applied Mechanics and Engineering | Year: 2011

Due to their increased complexity hexahedral elements are more challenging with respect to mesh generation and mesh improvement techniques than tetrahedral elements. In particular, there is a lack of geometry-based all-hexahedral smoothing methods for mesh quality improvement being easy to implement, practicable, and efficient. The recently introduced geometric element transformation method represents a new promising element oriented smoothing concept to resolve this deficiency. By giving a dual octahedron based regularizing transformation this new approach is adapted in order to smooth all-hexahedral meshes. First numerical tests indicate that the resulting smoothing method yields high quality results at least comparable to those of a state of the art global optimization-based approach while being significantly faster. © 2010 Elsevier B.V.

Hagemeyer J.,Bielefeld University | Hilgenstein A.,Bielefeld University | Jungewelter D.,Bielefeld University | Cozzi D.,Bielefeld University | And 11 more authors.
Proceedings of the 2012 NASA/ESA Conference on Adaptive Hardware and Systems, AHS 2012 | Year: 2012

Reconfigurable hardware is gaining a steadily growing interest in the domain of space applications. The ability to reconfigure the information processing infrastructure at runtime together with the high computational power of today's FPGA architectures at relatively low power makes these devices interesting candidates for data processing in space applications. Partial dynamic reconfiguration of FPGAs enables maximum flexibility and can be utilized for performance increase, for improving energy efficiency, and for enhanced fault tolerance. To be able to prove the effectiveness of these novel approaches for satellite payload processing, a highly scalable prototyping environment has been developed, combining dynamically reconfigurable FPGAs with the required interfaces such as SpaceWire, MIL-STD-1553B, and SpaceFibre. Up to 30 SpaceWire interfaces, 5 copper-based SpaceFibre interfaces, and 270 GPIOs can be realized and combined with one to five dynamically reconfigurable Xilinx FPGAs and up to 20 GByte of working memory. The implemented approach for dynamic reconfiguration enables partial reconfiguration at 400 MByte/s. Blind and readback scrubbing is supported and the scrub rate can be adapted individually for different parts of the design. © 2012 IEEE.

Sievers K.,Leibniz Institute For Wissensmedien Knowledge Media Research Center | Wodzicki K.,Leibniz Institute For Wissensmedien Knowledge Media Research Center | Aberle I.,TWT GmbH Science and Innovation | Keckeisen M.,TWT GmbH Science and Innovation | Cress U.,Leibniz Institute For Wissensmedien Knowledge Media Research Center
Computers in Human Behavior | Year: 2015

Online professional networks become more and more important for professional self-presentation, for recruitment processes, and job hunting. While previous studies determine that individuals present themselves authentically on rather privately used social networks, self-presentation on online professional networks is still unexplored. This study examines how validly individuals present themselves on professional networks. It investigates whether an individual's online self-presentation is idealized or rather authentic. 63 owners of a profile on the German professional network XING had to describe themselves twice - first authentically and then idealistically. Both self-descriptions were compared with the ratings of five independent observers who received the participants' XING profiles. Results reveal that observer ratings correlated significantly with some of the profile owners' authentic personality and job-relevant characteristics, but none of them correlated significantly with the idealized self-descriptions of the profile owners. This shows that individuals present themselves rather authentically on XING. © 2015 Elsevier Ltd. All rights reserved.

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