TY - CHAP A1 - Dünnweber, Jan A1 - Gorlatch, Sergei A1 - Parlavantzas, Nikos A1 - Baude, Francoise A1 - Legrand, Virginie T1 - Towards automatic creation of web services for grid component composition T2 - Integrated Research in GRID Computing : CoreGRID Integration Workshop 2005 (Selected Papers), November 28-30, Pisa, Italy N2 - While high-level software components simplify the programming of grid applications and Web services increase their interoperability, developing such components and configuring the interconnecting services is a demanding task. In this paper, we consider the combination of Higher-Order Components (HOCs) with the Fractal component model and the ProActive library. HOCs are parallel programming components, made accessible on the grid via Web services that use a special class loader enabling code mobility: executable code can be uploaded to a HOC, allowing one to customize the HOC. Fractal simplifies the composition of components and the ProActive library offers a generator for automatically creating Web services from components composed with Fractal, as long as all the parameters of these services have primitive types. Taking all the advantages of HOCs, ProActive and Fractal together, the obvious conclusion is that composing HOCs using Fractal and automatically exposing them as Web services on the grid via ProActive minimizes the required efforts for building complex grid systems. In this context, we solved the problem of exchanging code-carrying parameters in automatically generated Web services by integrating the HOC class loading mechanism into the ProActive library. KW - CoreGRID Component Model (GCM) & Fractal KW - Higher-Order Components Y1 - 2007 SN - 978-0-387-47658-2 SN - 978-0-387-47656-8 U6 - https://doi.org/10.1007/978-0-387-47658-2_3 SP - 31 EP - 42 PB - Springer Science+Business Media CY - Boston, MA ER - TY - CHAP A1 - Euringer, Thomas A1 - Obergrießer, Mathias A1 - Borrmann, André A1 - Rank, Ernst T1 - Integration of geotechnical design and analysis processes using a parametric and 3D-model based approach T2 - International Workshop on Computing in Civil Engineering, 19.-22.06.2011, Miami, Florida, USA N2 - The aim of this work is to improve the integration between the geotechnical and infrastructural designing, modeling and analyzing processes. Up to now these three planning stages are executed isolated and without the required data exchange between each other. This separation leads to time-consuming and expensive manual re-input of geometric and semantic data. Currently, roads are designed using the traditional approach which is based on various 2D drawings. The current design process focuses on the roadway itself, additional geotechnical conditions such as the slope angle of the dam or the position of a retaining wall are not considered. To solve these problems, a new parametric and 3D-model based approach has been developed in the research project ForBAU — The virtual construction site. This new approach is based on the traditional 2D infrastructure planning process, but includes a new parameterized 3D modeling concept. Different open data formats such as LandXML and GroundXML allow data integration with both, a parametric Computer Aided Design (CAD) system and a geotechnical engineering software. An automatic update function ensures data flow without loss of information. Usage of this new approach will accelerate the infrastructure design and provide a parametric 3D-model approach to close the gap between the geotechnical and the infrastructure planning process. This paper provides detailed information about this new integration concept and gives an overview on the various implementation steps. Y1 - 2011 U6 - https://doi.org/10.1061/41182(416)53 SP - 430 EP - 437 PB - American Society of Civil Engineers ER - TY - CHAP A1 - Euringer, Thomas A1 - Obergrießer, Mathias A1 - Ji, Yang A1 - Baumgärtel, T. A1 - Borrmann, André A1 - Rank, Ernst ED - Topping, B. H. V. ED - Costa Neves, L. F. ED - Baros, R. C. T1 - GroundXML: An addition of aligmnent and subsoil specific cross-sectional data to the LandXML scheme T2 - Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing, Funchal, Madeira, Portugal, 1-4 September 2009 Y1 - 2009 SN - 9781905088300 SN - 9781905088324 PB - Civil-Comp Press CY - Stirlingshire, UK ER - TY - JOUR A1 - Heckner, Markus A1 - Schworm, Silke T1 - The tagblog: Exploring social web user contribution to encourage students to actively engage in learning content JF - International Journal of Web Based Communities N2 - After leaving the lecture hall, students hardly reflect about the lesson's contents. To foster learning, the lesson content should be reorganised, elaborated and critically reflected. Tagging and blogging offer the opportunity to actively engage students in follow-up course work. This paper presents the results of a case study exploring the use of a social web application to encourage student contributions within the context of an undergraduate university seminar. The tagblog combines blogging, tagging and rating as three forms of online user contribution on Web 2.0 to develop a shared, emergent group knowledge repository. Blog posts, tags and comments are analysed to examine how user contributions reflect the active processing of learning content. KW - web 20 KW - social web KW - higher education KW - contribution KW - learning content KW - student participation KW - universities KW - tagging KW - tags KW - blogging KW - blogs KW - weblogs KW - rating KW - undergraduate seminars Y1 - 2009 U6 - https://doi.org/10.1504/IJWBC.2009.028088 SN - 1741-8216 SN - 1477-8394 VL - 5 IS - 4 SP - 528 EP - 542 PB - Inderscience Enterprises CY - Olney ER - TY - JOUR A1 - Heckner, Markus A1 - Wolff, Christian T1 - Wissensmanagement mit Social Software [Editorial] JF - Information - Wissenschaft und Praxis : IWP Y1 - 2009 UR - https://www.b-i-t-online.de/pdf/iwp/IWP2009-4.pdf SN - 1619-4292 SN - 1434-4653 VL - 60 IS - 4 SP - 185 EP - 187 PB - DGI ; De Gruyter CY - Frankfurt, Main ; Berlin ; New York ER - TY - CHAP A1 - Braun, Stefan A1 - Schildgen, Johannes A1 - Deßloch, Stefan T1 - Visualization of NoSQL transformations using sampling techniques | Visualisierung von NoSQL-Transformationen unter der Verwendung von Sampling-Techniken T2 - Proceedings of the LWA 2015 workshops: KDML, FGWM, IR, and FGDB : Trier, Germany, October 7-9, 2015 N2 - Analysen auf NoSQL-Datenbanken sind oft langdauernd und die Ergebnisse fur den Benutzer haufig schwer verst ̈andlich. Wir prasentieren eine Möglichkeit, Datenmengen aus Wide-Column Stores mittels der Transformationssprache NotaQL zu transformieren sowie zu aggregieren und die Ergebnisse in Form von Diagrammen dem Benutzer darzustellen. Dabei kommen Sampling-Techniken zum Einsatz, um die Berechnung auf Kosten der Genauigkeit zu beschleunigen. Das von uns verwendete iterative Samplingverfahren sorgt fur eine kontinuierliche Verbesserung der Berechnungsgenauigkeit und bietet zudem Möglichkeiten zur Genauigkeitsabschätzung, die in Form von Konfidenzintervallen in den Diagrammen dargestellt werden kann. Y1 - 2015 UR - https://ceur-ws.org/Vol-1458/H06_CRC77_Braun.pdf SP - 427 EP - 438 PB - RWTH Aachen CY - Aachen ER - TY - JOUR A1 - Anten, Kerstin A1 - Lebsanft, Markus A1 - Krauß, M. A1 - Noster, Ulf A1 - Scholtes, Berthold T1 - Einfluss von Randschichtzustand und Haltezeit auf die thermische Ermüdung der Magnesiumbasislegierung AZ31 JF - Materialwissenschaft und Werkstofftechnik N2 - Die vorliegende Arbeit befasst sich mit Untersuchungen zur thermischen Ermüdung der Magnesiumbasislegierung AZ31 im Temperaturbereich zwischen +50°C und +290°C. Die Experimente erfolgten unter konstanter Totaldeformation (out-of-phase-Beanspruchung) und es wurde der Verlauf der Spannungsamplitude sowie der plastischen Dehnungsamplitude über die Zahl der Temperaturzyklen ermittelt. Insbesondere wurde der Einfluss einer mechanischen Oberflächenbehandlung (Festwalzen) sowie von Haltezeiten auf den Verlauf der Schädigung untersucht. In beiden Fällen konnte kein signifikanter Unterschied zu unbehandelten Proben bzw. Beanspruchungen ohne Haltezeit festgestellt werden, welches auf die Wechselwirkungen zwischen Verformungs- und Rekristallisationsprozessen bei der thermischen Ermüdung zurückzuführen ist. T2 - Influence of near surface materials states and of hold-times on thermal fatigue of magnesium base alloy AZ31 Y1 - 2012 VL - 43 IS - 12 SP - 993 EP - 1000 PB - Wiley ER - TY - JOUR A1 - Budde, Hans-Günter A1 - Jungnitsch, Georg T1 - Kurzzeit-Kodierung von verbalem Material bei prälingual Gehörlosen JF - Zeitschrift für experimentelle und angewandte Psychologie N2 - Studies conducted by R. Conrad (1970, 1973) and M. I. Posner et al (1969) led to the hypothesis that the prelingually deaf encode visually perceived verbal information on the basis of its form. To examine this hypothesis, the RTs of 19 congenitally deaf and 33 normal 9–16 yr olds were measured as the Ss compared successively presented pairs of upper- and lowercase letters. Results fail to support the hypothesis and demonstrate the importance of the effects of development and of modern education programs for the deaf on the encoding of perceived verbal materials. (French abstract) (33 ref) (PsycINFO Database Record (c) 2016 APA, all rights reserved) Y1 - 1982 SN - 0044-2712 VL - 29 IS - 4 SP - 568 EP - 581 PB - Verl. für Psychologie Hogrefe CY - Göttingen ER - TY - JOUR A1 - auf der Heide, Friedhelm Meyer A1 - Schindelhauer, Christian A1 - Volbert, Klaus A1 - Grünewald, Matthias T1 - Congestion, dilation, and energy in radio networks JF - Theory of Computing Systems N2 - We investigate the problem of path selection in radio networks for a given static set of n sites in two- and three-dimensional space. For static point-to-point communication we define measures for congestion, dilation, and energy consumption that take interferences among communication links into account. We show that energy-optimal path selection for radio networks can be computed in polynomial time. Then we introduce the diversity g(V) of a set V ⫅ ℝd for any constant d. It can be used to upper bound the number of interfering edges. For real-world applications it can be regarded as Θ(log n). A main result is that a c-spanner construction as a communication network allows one to approximate the congestion-optimal path system by a factor of O(g(V)2). Furthermore, we show that there are vertex sets where only one of the performance parameters congestion, dilation, and energy can be optimized at a time. We show trade-offs lower bounding congestion × dilation and dilation × energy. The trade-off between congestion and dilation increases with switching from two-dimensional to three-dimensional space. For congestion and energy the situation is even worse. It is only possible to find a reasonable approximation for either congestion or energy minimization, while the other parameter is at least a polynomial factor worse than in the optimal network. KW - Medium Access Control KW - Minimum Span Tree KW - Communication Link KW - Unit Energy KW - Radio Station Y1 - 2004 U6 - https://doi.org/10.1007/s00224-004-1124-z VL - 37 IS - 3 SP - 343 EP - 370 PB - Springer Nature ER - TY - JOUR A1 - Heckner, Markus A1 - Mühlbacher, Susanne A1 - Wolff, Christian T1 - Tagging tagging. Analysing user keywords in scientific bibliography management systems JF - Journal of Digital Information N2 - In this paper, an empirical study of tagging behaviour in web-based bibliographic annotation systems is presented. Starting from an initial category finding phase in which tags attributed to selected articles from Connotea were classified we have set up a category model for linguistic and functional aspects of tag usage as well as for the relationship between tags and document full text. In a second phase this model is applied to approx. 500 tagged articles from the information and computer technology domain randomly selected from Connotea. Our findings show significant differences to other tagging research which was primarily conducted using popular (non-scientific) tagging platforms like Flickr or Delicious. We observe a great overlap of tag material and document text and rather few non-content related tags. The comparison of user tags with author keywords shows that users tend to use less and more general tags. Finally, system functionality seems to play a role for users’ tagging behaviour. Y1 - 2008 UR - https://jodi-ojs-tdl.tdl.org/jodi/article/view/246 VL - 9 IS - 2 PB - Multimedia Research Group ER -