@article{20947, abstract = {{Alkylphosphonic acids of different alkyl chain lengths were adsorbed on electrochemically polished NiTi surfaces from ethanolic solutions. The electropolishing process led to passive films mainly composed of Ti-oxyhydroxide. The surface showed nanoscopic etching pits with a depths of about 2 nm and a diameter of about 20 nm. The interfacial binding mechanism of the phosphonic acid group to the oxyhydroxide surface and the ordering of the monolayer were spectroscopically analysed by means of infrared reflection absorption FTIR-spectroscopy with (PM-IRRAS) and without (IRRAS) photoelastic modulation. The comparison of IRRAS and PM-IRRAS data of the long chain octadecylphosphonic acid monolayer proved that the binding mechanism of the phosphonic acid group to the oxyhydroxide surface is based on a mono-or bidentate bond, which is not stable in the presence of high water activities. An alkyl chain length of 17 CH2 groups is required for the formation of self-assembled monolayers, which are stable in aqueous environments. These long chain aliphatic organophosphonic acid monolayers were shown to inhibit anodic and cathodic surface reactions. (C) 2010 Elsevier B.V. All rights reserved.}}, author = {{Maxisch, M. and Ebbert, Christoph and Torun, B. and Fink, N. and de los Arcos, T. and Lackmann, J. and Maier, H. J. and Grundmeier, Guido}}, issn = {{1873-5584}}, journal = {{APPLIED SURFACE SCIENCE}}, number = {{6}}, pages = {{2011--2018}}, title = {{{PM-IRRAS studies of the adsorption and stability of organophosphonate monolayers on passivated NiTi surfaces}}}, doi = {{10.1016/j.apsusc.2010.09.044}}, volume = {{257}}, year = {{2011}}, } @article{1725, author = {{Liu, Ming and Yin, Xiaobo and Ulin-Avila, Erick and Geng, Baisong and Zentgraf, Thomas and Ju, Long and Wang, Feng and Zhang, Xiang}}, issn = {{0028-0836}}, journal = {{Nature}}, number = {{7349}}, pages = {{64--67}}, publisher = {{Springer Nature}}, title = {{{A graphene-based broadband optical modulator}}}, doi = {{10.1038/nature10067}}, volume = {{474}}, year = {{2011}}, } @article{1726, author = {{Utikal, Tobias and Zentgraf, Thomas and Paul, Thomas and Rockstuhl, Carsten and Lederer, Falk and Lippitz, Markus and Giessen, Harald}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{13}}, publisher = {{American Physical Society (APS)}}, title = {{{Towards the Origin of the Nonlinear Response in Hybrid Plasmonic Systems}}}, doi = {{10.1103/physrevlett.106.133901}}, volume = {{106}}, year = {{2011}}, } @article{1727, author = {{Valentine, Jason and Zhang, Shuang and Zentgraf, Thomas and Zhang, Xiang}}, issn = {{0018-9219}}, journal = {{Proceedings of the IEEE}}, number = {{10}}, pages = {{1682--1690}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Development of Bulk Optical Negative Index Fishnet Metamaterials: Achieving a Low-Loss and Broadband Response Through Coupling}}}, doi = {{10.1109/jproc.2010.2094593}}, volume = {{99}}, year = {{2011}}, } @article{1728, author = {{Zentgraf, Thomas and Liu, Yongmin and Mikkelsen, Maiken H. and Valentine, Jason and Zhang, Xiang}}, issn = {{1748-3387}}, journal = {{Nature Nanotechnology}}, number = {{3}}, pages = {{151--155}}, publisher = {{Springer Nature}}, title = {{{Plasmonic Luneburg and Eaton lenses}}}, doi = {{10.1038/nnano.2010.282}}, volume = {{6}}, year = {{2011}}, } @inbook{17317, author = {{Oevel, Gudrun and Toschläger, M.}}, booktitle = {{Prozessorientierte Hochschule}}, editor = {{Degkwitz, A. and Klapper, F.}}, publisher = {{Bock + Herchen}}, title = {{{Einführung eines prozessorientierten Campusmanagement an der Universität Paderborn – ein Erfahrungsbericht}}}, year = {{2011}}, } @inproceedings{17318, author = {{Brennecke, Andreas and Oevel, Gudrun and Strothmann, A.}}, booktitle = {{4. DFN-Forum Kommunikationstechnologien – Beiträge der Fachtagung 20./21.6.2011 Bonn}}, editor = {{Müller, P. and Neumair, B. and Dreo Rodosek, G.}}, location = {{Bonn}}, pages = {{69–78}}, publisher = {{Gesellschaft für Informatik}}, title = {{{Vom Studiolo zur virtuellen Forschungsumgebung}}}, volume = {{187}}, year = {{2011}}, } @inproceedings{17450, author = {{Suess, Tim and Jähn, Claudius and Fischer, Matthias and Meyer auf der Heide, Friedhelm and Koch, Clemens}}, booktitle = {{Augmented & Virtual Reality in der Produktentstehung}}, pages = {{185----197}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts}}, title = {{{Ein paralleles Out-of-Core Renderingsystem für Standard-Rechnernetze}}}, volume = {{295}}, year = {{2011}}, } @phdthesis{18973, author = {{Frahling, Gereon}}, isbn = {{978-3-942647-09-0}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Algorithms for Dynamic Geometric Data Streams}}}, volume = {{290}}, year = {{2011}}, } @phdthesis{18974, author = {{Mehler, Jan}}, isbn = {{978-3-942647-06-9}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Power-Aware Online File Allocation in Dynamic Networks}}}, volume = {{287}}, year = {{2011}}, } @phdthesis{18976, abstract = {{Web computing is a variant of parallel computing where the idle times of PCs donated by worldwide distributed users are employed to execute parallel programs. In this thesis we consider a web computing variant with two important properties: First, we support the execution of coupled, massively parallel algorithms (rather than distributed data processing). And second, we organize the system in peer-to-peer fashion. We present the Paderborn University BSP-based Web Computing (PUB-Web) library, which supports the execution of parallel programs in the bulk-synchronous style (BSP) in such a web computing setting. In this thesis, we focus on important technical and algorithmic aspects, in particular: In order to schedule processes with respect to the currently available computing power, which continually changes in an unpredictable fashion, we need intelligent load balancing algorithms and -- as a basic precondition -- the technical ability to migrate threads at runtime. To achieve the latter in a way suitable for production use, compatible with recent Java versions, available for all important platforms, and easy-to-use for developers, we develop the PadMig thread migration and checkpointing library. In order to tackle the distributed load balancing problem, we present an algorithm based on Distributed Heterogeneous Hash-Tables. In order to judge the quality of the schedules produced, we perform extensive experiments to compare several variants of the DHHT-based load balancer with the well- established Work Stealing algorithm, using realistic input data obtained by profiling the utilization of several hundred PCs for a period of several months. Beside the available computing power, we finally also consider the network bandwidth as a secondary criterion for load balancing. For this purpose, we cluster the PUB-Web network according to bandwidth, employing a novel, fault-tolerant, adaptive, and scaling distributed clustering algorithm called DiDiC. In order to judge the quality of the clusterings produces by DiDiC, we experimentally compare it to the well-established MCL algorithm using a simulator.}}, author = {{Gehweiler, Joachim}}, isbn = {{978-3-942647-17-5}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Peer-to-Peer Based Parallel Web Computing}}}, volume = {{298}}, year = {{2011}}, } @inproceedings{20915, abstract = {{Durch die immer kuerzer werdenden Entwicklungszyklen und den groeßer werdenden Druck bzgl. Time-to-Market fuer eingebettete Systeme im Automobilsektor steigt der Bedarf, die Systeme bereits zu fruehen Entwicklungszeitpunkten gegenueber den Qualitaetsanforderungen (z. B. Zeitanforderungen und Ressourcenauslastung) zu verifizieren. Wir stellen einen Ansatz vor, der eine formale Spezifikation von Zeitanforderungen und Wirkketten sowie deren fruehzeitige Analyse durch Simulation erlaubt. Verletzungen von Zeitanforderungen werden in den Simulationsergebnissen automatisch erkannt. }}, author = {{Meyer, Jan and Holtmann, Jörg and Meyer, Matthias}}, booktitle = {{8. Paderborner Workshop Entwurf mechatronischer Systeme}}, pages = {{203--215}}, publisher = {{Heinz Nixdorf Institut}}, title = {{{Formalisierung von Anforderungen und Betriebssystemeigenschaften zur fruehzeitigen Simulation von eingebetteten, automobilen Systemen}}}, volume = {{294}}, year = {{2011}}, } @inproceedings{20916, abstract = {{Safety critical functions for embedded systems are increasingly realized with software. Current and future standards and maturity models impose high accuracy and quality for the development process of such software-intensive, embedded systems. But nowadays, there are process and tooling gaps between different modeling aspects for the system under development (SUD). Furthermore, the SUD is usually verified and validated not until it is completely implemented, which leads to expensive corrections. In this paper we present a seamless, model-based development process, which is intended for the automotive supplier domain and conforms to the process reference model of Automotive SPICE. The development process addresses the issues mentioned above by using systematic transitions between different modeling aspects and simulations in early development stages.}}, author = {{Holtmann, Jörg and Meyer, Jan and Meyer, Matthias}}, booktitle = {{Software Engineering 2011 – Workshopband (inkl. Doktorandensymposium)}}, pages = {{79--88}}, publisher = {{Bonner Koellen Verlag}}, title = {{{A Seamless Model-Based Development Process for Automotive Systems}}}, volume = {{P-184}}, year = {{2011}}, } @inproceedings{22188, abstract = {{The aim of this paper is the description and evaluation of physical properties like porosity and density and their influence on mechanical properties of laser sintered polyamide parts. For example, by reducing the porosity an increase of mechanical properties is possible. The correlation of laser parameters to these properties is investigated in detail. The energy density is an important parameter for the laser sintering process. By changing laser power, scan velocity and hatch distance an influence on manufactured components is given. A systematic variation of all three laser parameters is performed. A comparison of results obtained at constant energy densities obtained by varying these relevant parameters accordingly is shown as well.}}, author = {{Rüsenberg, Stefan and Schmidt, L. and Schmid, Hans-Joachim}}, booktitle = {{22th Annual International Solid Freeform Fabrication Symposium}}, pages = {{239--251}}, title = {{{Mechanical and Physical Properties - A Way to asses quality of Laser Sintered Parts}}}, doi = {{http://utw10945.utweb.utexas.edu/Manuscripts/2011/2011-19-Ruesenberg.pdf}}, volume = {{22}}, year = {{2011}}, } @book{22191, author = {{Rüsenberg, Stefan and Schmidt, L. and Hosse, H. and Schmid, Hans-Joachim}}, isbn = {{978-0-429-21774-6}}, pages = {{531--538}}, title = {{{Porosity as a key to increase material properties of laser sintered parts}}}, doi = {{10.1201/b11341}}, year = {{2011}}, } @book{22358, author = {{Adam, Guido and Zimmer, Detmar}}, isbn = {{978-0-2031-8141-6}}, pages = {{545--551}}, publisher = {{CRC Press}}, title = {{{Direct Manufacturing Design Rules}}}, doi = {{10.1201/b11341-88}}, year = {{2011}}, } @inproceedings{22360, author = {{Zimmer, Detmar and Adam, Guido}}, booktitle = {{Rapid.Tech 2011 Fachmesse und Anwendertagung für Rapid-Technologie}}, title = {{{DMDR Direct Manufacturing Design Rules. Erarbeiten von applikationsunabhängigen Konstruktionsregeln}}}, year = {{2011}}, } @phdthesis{23193, author = {{Harchenko, Jewgenij}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Mechatronischer Entwurf eines neuartigen aktiven Fahrzeugfederungssystems für PKW unter Verwendung einer reversierbaren Flügelzellenpumpe}}}, volume = {{288}}, year = {{2011}}, } @inproceedings{2188, author = {{Miranda, Alberto and Effert, Sascha and Kang, Yangwook and Miller, Ethan and Brinkmann, André and Cortes, Toni}}, booktitle = {{Proc. Int. Conf. on High Performance Computing (HIPC)}}, pages = {{1--10}}, publisher = {{IEEE Computer Society}}, title = {{{Reliable and Randomized Data Distribution Strategies for Large Scale Storage Systems}}}, doi = {{10.1109/HiPC.2011.6152745}}, year = {{2011}}, } @inproceedings{2189, author = {{Grawinkel, Matthias and Pargmann, Markus and Dömer, Hubert and Brinkmann, André}}, booktitle = {{Proc. IEEE Int. Conf. on Parallel and Distributed Systems (ICPADS)}}, pages = {{380--387}}, publisher = {{IEEE}}, title = {{{Lonestar: An Energy-Aware Disk Based Long-Term Archival Storage System}}}, doi = {{10.1109/ICPADS.2011.77}}, year = {{2011}}, }