@inproceedings{25412, author = {{Dangelmaier, Wilhelm}}, booktitle = {{Schenk, Michael;Zadek, Hartmut;Müller, Gerhard;Richter, Klaus;Seidel, Holger (Hrsg.): 20. Magdeburger Logistiktage "Sichere und nachhaltige Logistik"}}, editor = {{Schenk, Michael and Zadek, Hartmut and M{\"u}ller, Gerhard and Richter, Klaus and Seidel, Holger}}, pages = {{37--42}}, title = {{{Online-Optimierung zur Festlegung von Bestellzeitpunkten in der Losgr{\"o}{\ss}enfertigung}}}, year = {{2015}}, } @misc{28224, author = {{Gausemeier, Jürgen}}, isbn = {{978-3-942647-66-3}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Vorausschau und Technologieplanung. 11. Symposium für Vorausschau und Technologieplanung, Heinz Nixdorf Institut, 29. und 30. Oktober 2015}}}, volume = {{347}}, year = {{2015}}, } @inproceedings{28322, author = {{Jähn, Claudius and Fischer, Matthias and Gerges, Maria and Berssenbrügge, Jan}}, booktitle = {{12. Paderborner Workshop Augmented & Virtual Reality in der Produktentstehung, Band 342}}, pages = {{107--120}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts}}, title = {{{Automatische Ableitung geometrischer Eigenschaften von Bauteilen aus dem 3-D-Polygonmodell}}}, year = {{2015}}, } @article{26122, abstract = {{An essential part of mobility particle size spectroscopy is the prediction of the aerosol charge distribution in a highly concentrated bipolar ion environment. This charge distribution can be readily calculated, but is depending on several environmental conditions. These influences are investigated theoretically. The first part of this work deals with a sensitivity analysis using the Fuchs model (Fuchs, 1963) to determine the variation of the resulting charge distributions depending on the input parameters. It is demonstrated, that the main influencing variable is the difference between the positive and negative ion mobility. A sensitivity analysis reveals that a reasonable variation of the ion mobilities may lead to variations of the particle density distribution up to±20%. The second part investigates the evolution of the charge distribution along the tubing downstream of the bipolar charger exit starting with equal ion concentrations for positive and negative ions. Due to wall losses depending on ion mobility a non-equilibrium charge distribution is developing along the plumbing. The evolution of the particle charge distribution is determined using a coupled population balance model. Even though the non-equilibrium character is clearly shown, it turns out that this effect is negligible at conditions typical for particle size measurements.}}, author = {{Tigges, L. and Jain, A. and Schmid, Hans-Joachim}}, issn = {{0021-8502}}, journal = {{Journal of Aerosol Science}}, pages = {{119--134}}, title = {{{On the bipolar charge distribution used for mobility particle sizing: Theoretical considerations}}}, doi = {{10.1016/j.jaerosci.2015.05.010}}, year = {{2015}}, } @inproceedings{26449, author = {{Winkelnkemper, Felix and Oberhoff, Andreas}}, editor = {{wedge, Reinhard and Selke, Harald}}, pages = {{103--117}}, publisher = {{Publication series of the Heinz Nixdorf Institute, Paderborn}}, title = {{{WebArena - R {\ "a} spacious structures for {\" u} r the learning locations of the future}}}, volume = {{330}}, year = {{2015}}, } @book{26531, editor = {{Keil, Reinhard and Selke, Harald}}, publisher = {{publishing series of the Heinz Nixdorf Institute, Paderborn}}, title = {{{20 years of learning with the World Wide Web - technology and education in dialogue}}}, volume = {{330}}, year = {{2015}}, } @inproceedings{26532, author = {{Keil, Reinhard and Selke, Harald}}, editor = {{Keil, Reinhard and Selke, Harald}}, pages = {{1--7}}, publisher = {{Publishing series of the Heinz Nixdorf Institute, Paderborn}}, title = {{{Learn with, through and {\ "about the WWW}}}, volume = {{330}}, year = {{2015}}, } @inproceedings{26533, author = {{Keil, Reinhard and Selke, Harald}}, editor = {{Keil, Reinhard and Selke, Harald}}, pages = {{39--53}}, publisher = {{publishing series of the Heinz Nixdorf Institute, Paderborn}}, title = {{{Virtual knowledge {\ "a} ume - From the presentation of content to virtual learning {\" a} tten}}}, volume = {{330}}, year = {{2015}}, } @article{26921, abstract = {{AbstractThe growth hormone (GH) insulin-like growth factor (IGF) axis has been linked to insulin metabolism and cancer risk. Experimental evidence indicates that the GH–IGF axis itself can be influenced by dietary flavonoids. As fruit and vegetable (FV) intake is a major source of flavonoid consumption, FV’s beneficial health effects may be explained via flavonoids’ influence on the GH–IGF axis, but observational evidence is currently rare. We used data from Dortmund Nutritional and Anthropometric Longitudinally Designed Study participants to analyse prospective associations between FV, fruit intake and flavonoid intake from FV (FlavFV) with IGF-1 and its binding proteins IGFBP-2 and IGFBP-3. Subjects needed to provide a fasting blood sample in adulthood (18–39 years) and at least two 3-d weighed dietary records in early life (0·5−2 years,n191), mid-childhood (3−7 years,n265) or adolescence (girls: 9−15 years, boys: 10−16 years,n261). Additional analyses were conducted among those providing at least three 24-h urine samples in adolescence (n236) to address the predictor urinary hippuric acid (HA), a biomarker of polyphenol intake. Higher fruit intake in mid-childhood and adolescence was related to higher IGFBP-2 in adulthood (P=0·03 andP=0·045). Comparable trends (P=0·045−0·09) were discernable for FV intake (but not FlavFV) in all three time windows. Similarly, higher adolescent HA excretion tended to be related (P=0·06) to higher adult IGFBP-2 levels. Regarding IGFBP-3, a marginal (P=0·08) positive association was observed with FlavFV in mid-childhood only. None of the investigated dietary factors was related to IGF-1. In conclusion, higher fruit and FV intakes during growth may be relevant for adult IGFBP-2, but probably not for IGFBP-3 or IGF-1.}}, author = {{Krupp, Danika and Remer, Thomas and Penczynski, Katharina J. and Bolzenius, Katja and Wudy, Stefan A. and Buyken, Anette}}, issn = {{0007-1145}}, journal = {{British Journal of Nutrition}}, pages = {{527--537}}, title = {{{Relevance of fruits, vegetables and flavonoids from fruits and vegetables during early life, mid-childhood and adolescence for levels of insulin-like growth factor (IGF-1) and its binding proteins IGFBP-2 and IGFBP-3 in young adulthood}}}, doi = {{10.1017/s0007114515004742}}, year = {{2015}}, } @article{320, abstract = {{We consider structural and algorithmic questions related to the Nash dynamics of weighted congestion games. In weighted congestion games with linear latency functions, the existence of pure Nash equilibria is guaranteed by a potential function argument. Unfortunately, this proof of existence is inefficient and computing pure Nash equilibria in such games is a PLS-hard problem even when all players have unit weights. The situation gets worse when superlinear (e.g., quadratic) latency functions come into play; in this case, the Nash dynamics of the game may contain cycles and pure Nash equilibria may not even exist. Given these obstacles, we consider approximate pure Nash equilibria as alternative solution concepts. A ρ--approximate pure Nash equilibrium is a state of a (weighted congestion) game from which no player has any incentive to deviate in order to improve her cost by a multiplicative factor higher than ρ. Do such equilibria exist for small values of ρ? And if so, can we compute them efficiently?We provide positive answers to both questions for weighted congestion games with polynomial latency functions by exploiting an “approximation” of such games by a new class of potential games that we call Ψ-games. This allows us to show that these games have d!-approximate pure Nash equilibria, where d is the maximum degree of the latency functions. Our main technical contribution is an efficient algorithm for computing O(1)-approximate pure Nash equilibria when d is a constant. For games with linear latency functions, the approximation guarantee is 3+√5/2 + Oγ for arbitrarily small γ > 0; for latency functions with maximum degree d≥ 2, it is d2d+o(d). The running time is polynomial in the number of bits in the representation of the game and 1/γ. As a byproduct of our techniques, we also show the following interesting structural statement for weighted congestion games with polynomial latency functions of maximum degree d ≥ 2: polynomially-long sequences of best-response moves from any initial state to a dO(d2)-approximate pure Nash equilibrium exist and can be efficiently identified in such games as long as d is a constant.To the best of our knowledge, these are the first positive algorithmic results for approximate pure Nash equilibria in weighted congestion games. Our techniques significantly extend our recent work on unweighted congestion games through the use of Ψ-games. The concept of approximating nonpotential games by potential ones is interesting in itself and might have further applications.}}, author = {{Caragiannis, Ioannis and Fanelli, Angelo and Gravin, Nick and Skopalik, Alexander}}, journal = {{Transactions on Economics and Computation}}, number = {{1}}, publisher = {{ACM}}, title = {{{Approximate Pure Nash Equilibria in Weighted Congestion Games: Existence, Efficient Computation, and Structure}}}, doi = {{10.1145/2614687}}, volume = {{3}}, year = {{2015}}, } @article{3847, abstract = {{Sheets of slab waveguides with sharp corners are investigated. By means of rigorous numerical experiments, we look at oblique incidence of semi-guided plane waves. Radiation losses vanish beyond a certain critical angle of incidence. One can thus realize lossless propagation through 90-degree corner configurations, where the remaining guided waves are still subject to pronounced reflection and polarization conversion. A system of two corners can be viewed as a structure akin to a Fabry-Perot-interferometer. By adjusting the distance between the two partial reflectors, here the 90-degree corners, one identifies step-like configurations that transmit the semi-guided plane waves without radiation losses, and virtually without reflections. Simulations of semi-guided beams with in-plane wide Gaussian profiles show that the effect survives in a true 3-D framework.}}, author = {{Hammer, Manfred and Hildebrandt, Andre and Förstner, Jens}}, issn = {{0733-8724}}, journal = {{Journal of Lightwave Technology}}, keywords = {{tet_topic_waveguide}}, number = {{3}}, pages = {{997--1005}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Full Resonant Transmission of Semiguided Planar Waves Through Slab Waveguide Steps at Oblique Incidence}}}, doi = {{10.1109/jlt.2015.2502431}}, volume = {{34}}, year = {{2015}}, } @article{3894, abstract = {{We show how to optically connect guiding layers at different elevations in a 3-D integrated photonic circuit. Transfer of optical power carried by planar, semi-guided waves is possible without reflections or radiation losses, and over large vertical distances. This functionality is realized through simple step-like folds of high-contrast dielectric slab waveguides, in combination with oblique wave incidence, and fulfilling a resonance condition. Radiation losses vanish, and polarization conversion is suppressed for TE wave incidence beyond certain critical angles. This can be understood by fundamental arguments resting on a version of Snell’s law. The two 90° corners of a step act as identical partial reflectors in a Fabry–Perot-like resonator setup. By selecting the step height, i.e., the distance between the reflectors, one realizes resonant states with full transmission. Rigorous quasi-analytical simulations for typical silicon/silica parameters demonstrate the functioning. Combinations of several step junctions can lead to other types of optical on-chip connects, e.g., U-turn- or bridge-like configurations.}}, author = {{Hammer, Manfred and Hildebrandt, Andre and Förstner, Jens}}, issn = {{0146-9592}}, journal = {{Optics Letters}}, keywords = {{tet_topic_waveguide}}, number = {{16}}, pages = {{3711--3714}}, publisher = {{The Optical Society}}, title = {{{How planar optical waves can be made to climb dielectric steps}}}, doi = {{10.1364/ol.40.003711}}, volume = {{40}}, year = {{2015}}, } @article{3900, abstract = {{The coherent state preparation and control of single quantum systems is an important prerequisite for the implementation of functional quantum devices. Prominent examples for such systems are semiconductor quantum dots, which exhibit a fine structure split single exciton state and a V-type three level structure, given by a common ground state and two distinguishable and separately excitable transitions. In this work we introduce a novel concept for the preparation of a robust inversion by the sequential excitation in a V-type system via distinguishable paths.}}, author = {{Mantei, D. and Förstner, Jens and Gordon, S. and Leier, Y. A. and Rai, A. K. and Reuter, Dirk and Wieck, A. D. and Zrenner, Artur}}, issn = {{2045-2322}}, journal = {{Scientific Reports}}, keywords = {{tet_topic_qd}}, number = {{1}}, pages = {{10313}}, publisher = {{Springer Nature}}, title = {{{Robust Population Inversion by Polarization Selective Pulsed Excitation}}}, doi = {{10.1038/srep10313}}, volume = {{5}}, year = {{2015}}, } @article{3162, author = {{Ziegert, Steffen and Wehrheim, Heike}}, journal = {{Computer Science - R & D}}, number = {{3-4}}, pages = {{303----320}}, title = {{{Temporal plans for software architecture reconfiguration}}}, doi = {{10.1007/s00450-014-0259-7}}, year = {{2015}}, } @phdthesis{317, author = {{Jähn, Claudius}}, publisher = {{Universität Paderborn}}, title = {{{Bewertung von Renderingalgorithmen für komplexe 3-D-Szenen}}}, year = {{2015}}, } @inproceedings{27304, author = {{Moritzer, Elmar and Budde, C.}}, booktitle = {{20. Symposium Verbundwerkstoffe und Werkstoffverbunde}}, location = {{Wien (Österreich)}}, title = {{{Influence of Material Properties on the Bond Strength of a Hybrid Part Consisting of Composite Sheet and Short-Fiber Thermoplastic}}}, year = {{2015}}, } @inproceedings{17427, author = {{Jähn, Claudius and Fischer, Matthias and Gerges, Maria and Berssenbrügge, Jan}}, booktitle = {{12. Paderborner Workshop Augmented & Virtual Reality in der Produktentstehung}}, pages = {{107--120}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts}}, title = {{{Automatische Ableitung geometrischer Eigenschaften von Bauteilen aus dem 3-D-Polygonmodell}}}, volume = {{342}}, year = {{2015}}, } @inbook{18859, author = {{Seng, Eva- Maria}}, booktitle = {{Die Universität Breslau in der europäischen Kultur des 19. und 20. Jahrhunderts, in: Wroclaw University in the European Culture of 19th and 20th Centuries. Papers from the International Scientific Conference, Wroclaw 2011}}, editor = {{Harasimowicz, Jan}}, pages = {{463--472}}, title = {{{August Grisebach und die Neuausrichtung der deutschen Kunstgeschichte Anfang des 20. Jahrhunderts}}}, year = {{2015}}, } @article{23595, author = {{Kessler, Jan and Elgabarty, Hossam and Spura, Thomas and Karhan, Kristof and Partovi-Azar, Pouya and Hassanali, Ali A. and Kühne, Thomas D.}}, issn = {{1520-6106}}, journal = {{The Journal of Physical Chemistry B}}, pages = {{10079--10086}}, title = {{{Structure and Dynamics of the Instantaneous Water/Vapor Interface Revisited by Path-Integral and Ab Initio Molecular Dynamics Simulations}}}, doi = {{10.1021/acs.jpcb.5b04185}}, year = {{2015}}, } @article{23636, author = {{Schiener, A. and Magerl, A. and Krach, A. and Seifert, S. and Steinrück, Hans-Georg and Zagorac, J. and Zahn, D. and Weihrich, R.}}, issn = {{2040-3364}}, journal = {{Nanoscale}}, pages = {{11328--11333}}, title = {{{In situ investigation of two-step nucleation and growth of CdS nanoparticles from solution}}}, doi = {{10.1039/c5nr01602a}}, volume = {{7}}, year = {{2015}}, }