@inproceedings{18907, abstract = {{In a (randomized) oblivious routing scheme the path chosen for a request
between a source $s$ and a target $t$ is independent from the current traffic
in the network. Hence, such a scheme consists of probability distributions
over $s-t$ paths for every source-target pair $s,t$ in the network.

In a recent result citeR02 it was shown that for any undirected network
there is an oblivious routing scheme that achieves a polylogarithmic
competitive ratio with respect to congestion. Subsequently, Azar et
al. citeACF+03 gave a polynomial time algorithm that for a given network
constructs the best oblivious routing scheme, i.e. the scheme that guarantees
the best possible competitive ratio.
Unfortunately, the latter result is based on the Ellipsoid algorithm; hence
it is unpractical for large networks.

In this paper we present a combinatorial algorithm for constructing an
oblivious routing scheme that guarantees a competitive ratio of $O(log^4n)$
for undirected networks. Furthermore, our approach yields a proof
for the existence of an oblivious routing scheme with competitive ratio
$O(log^3n)$, which is much simpler than the original proof from citeR02.}}, author = {{Bienkowski, Marcin and Korzeniowski, Miroslaw and Räcke, Harald}}, booktitle = {{Proceedings of the fifteenth annual ACM symposium on Parallel algorithms and architectures - SPAA '03}}, isbn = {{1581136617}}, title = {{{A practical algorithm for constructing oblivious routing schemes}}}, doi = {{10.1145/777412.777418}}, year = {{2003}}, } @inproceedings{18966, abstract = {{A recent seminal result of Räcke is that for any undirected network there is an oblivious routing algorithm with a polylogarithmic competitive ratio with respect to congestion. Unfortunately, Räcke's construction is not polynomial time. We give a polynomial time construction that guarantees Räcke's bounds, and more generally gives the true optimal ratio for any (undirected or directed) network.}}, author = {{Azar, Yossi and Cohen, Edith and Fiat, Amos and Kaplan, Haim and Racke, Harald}}, booktitle = {{Proceedings of the thirty-fifth ACM symposium on Theory of computing - STOC '03}}, isbn = {{1581136749}}, title = {{{Optimal oblivious routing in polynomial time}}}, doi = {{10.1145/780542.780599}}, year = {{2003}}, } @inproceedings{1917, author = {{Aguiar, Ana and Hoene, Christian and Klaue, Jirka and Karl, Holger and Miesmer, Horst and Wolisz, Adam}}, booktitle = {{Proc. of 8th Intl. Workshop on Mobile Multimedia Communications (MoMuC'03)}}, title = {{{Channel-aware Schedulers for VoIP and MPEG4 based on Channel Prediction}}}, year = {{2003}}, } @inproceedings{18196, abstract = {{Fast algorithms for arithmetic on real or complex polynomials are well-known and have proven to be not only asymptotically efficient but also very practical. Based on FAST FOURIER TRANSFORM, they for instance multiply two polynomials of degree up to N or multi-evaluate one at N points simultaneously within quasi-linear time O(N polylog N). An extension to (and in fact the mere definition of) polynomials over fields R and C to the SKEW-field H of quaternions is promising but still missing. The present work proposes three approaches which in the commutative case coincide but for H turn out to differ, each one satisfying some desirable properties while lacking others. For each notion, we devise algorithms for according arithmetic; these are quasi-optimal in that their running times match lower complexity bounds up to polylogarithmic factors.}}, author = {{Ziegler, Martin}}, booktitle = {{Proc. 14th Annual International Symposium on Algorithms and Computation (ISAAC'03)}}, isbn = {{9783540206958}}, issn = {{0302-9743}}, pages = {{705--715}}, title = {{{Quasi-optimal Arithmetic for Quaternion Polynomials}}}, doi = {{10.1007/978-3-540-24587-2_72}}, year = {{2003}}, } @article{22324, author = {{Zimmer, Detmar}}, journal = {{Konstruktion - Zeitschrift für Produktentwicklung und Ingenieur-Werkstoffe }}, number = {{3}}, pages = {{53--55}}, publisher = {{Springer-VDI-Verlag }}, title = {{{Entwicklung eines Getriebemotoren-Baukastens}}}, volume = {{54}}, year = {{2003}}, } @article{23338, author = {{Mehl, Volker and Trächtler, Ansgar}}, journal = {{fahrwerk.tech}}, title = {{{Entwicklung integrierter Fahrdynamikregelsysteme von der Idee bis zur Erprobung im Fahrzeug}}}, year = {{2003}}, } @inproceedings{23339, author = {{Koch, Thorsten and Harchenko, Jewgenij and Rustemeier, Carsten and Nyenhuis, Markus}}, booktitle = {{5. VDI-Mechatroniktagung}}, title = {{{Methoden für den Entwurf mechatronischer Systeme, dargestellt am Beispiel einer vollaktiven, integrierten Radaufhängung}}}, year = {{2003}}, } @article{23340, author = {{Sackmann, Martin and Trächtler, Ansgar}}, journal = {{at-Automatisierungstechnik}}, pages = {{535--546,}}, title = {{{Nichtlineare Fahrdynamikregelung mit einer aktiven Vorderachslenkung zur Verbesserung des Seitenwindverhaltens}}}, volume = {{51}}, year = {{2003}}, } @article{23341, author = {{Trächtler, Ansgar and Verhagen, Armin}}, journal = {{5. Internationales Stuttgarter Symposium Kraftfahrzeuge und Verbrennungsmotoren}}, pages = {{468--477,}}, title = {{{Vehicle Dynamics Management Verbund von ESP, aktiver Lenkung und aktivem Fahrwerk}}}, year = {{2003}}, } @inproceedings{8933, author = {{Götting, Florian and Sextro, Walter and Panning, Lars and Popp, Karl}}, booktitle = {{Schwingungen in rotierenden Maschinen VI SIRM, Referate der Tagung in Darmstadt}}, editor = {{Irretier , H and Nordmann, R and Springer, H}}, pages = {{201--210}}, publisher = {{Vieweg-Verlag}}, title = {{{Schwingungsverhalten von verstimmten Beschaufelungen mit Reibelementen}}}, year = {{2003}}, } @article{8934, abstract = {{Im Folgenden wird eine Berechnungsmethode vorgestellt, die es erlaubt, das räumliche Schwingungsverhalten eines elastischen Mehrkörpersystems (EMKS) mit Reibkontakten in rechenzeit- und speicherplatzsparender Form zu analysieren. Der von trockener Reibung und Mikroschlupf geprägte, nichtlineare Dämpfungsmechanismus in den Reibkontakten eines EMKS wird dabei realitätsnahe abgebildet. Die Plausibilität der mit der Methode gewonnenen Berechnungsergebnisse wird beispielhaft an einem einfachen EMKS, einem in Längsrichtung geteilten, einseitig eingespannten Balken gezeigt. Für den geteilten Balken werden die Frequenzgänge des Torsionswinkels um die Längsachse und der Auslenkung um die biegeweiche Achse berechnet.}}, author = {{Genzo, Alexander and Sextro, Walter and Popp, Karl}}, issn = {{1617-7061}}, journal = {{PAMM}}, number = {{1}}, pages = {{120--121}}, publisher = {{WILEY-VCH Verlag}}, title = {{{Erzwungene Schwingungen von elastischen Mehrkörpersystemen mit Reibkontakten}}}, doi = {{10.1002/pamm.200310046}}, volume = {{2}}, year = {{2003}}, } @inproceedings{8935, author = {{Hemsel, Tobias and Wallaschek, Jörg}}, booktitle = {{Proceedings of the 5th International Congress of Intelligent Materials (ICIM)}}, title = {{{Modelling and Analysis of Piezoelectric Transformers}}}, year = {{2003}}, } @inproceedings{8936, author = {{Littmann, Walter and Hemsel, Tobias and Kauczor, Christopher and Wallaschek, Jörg and Sinha, W}}, booktitle = {{Proceedings of World Congress Ultrasonics}}, pages = {{547--550}}, title = {{{Load-adaptive phase-controller for resonant driven piezoelectric devices}}}, year = {{2003}}, } @article{8937, abstract = {{Friction damping devices such as underplatform dampers are widely used in turbomachinery applications to reduce blade vibration amplitudes. In this paper, a model is presented briefly to calculate the forced response of mistuned bladed systems with friction dampers. Some results will give an insight in the vibrational behavior of frictionally damped bladed disks and how the damping gain is affected by the damper properties.}}, author = {{Panning, Lars and Sextro, Walter and Popp, Karl}}, issn = {{1617-7061}}, journal = {{PAMM}}, number = {{1}}, pages = {{118--119}}, publisher = {{WILEY-VCH Verlag}}, title = {{{Design of Friction Dampers for Mistuned Bladed Disks}}}, doi = {{10.1002/pamm.200310336}}, volume = {{3}}, year = {{2003}}, } @article{8938, author = {{Panning, Lars and Sextro, Walter and Popp, Karl}}, journal = {{International Journal of Rotating Machinery}}, number = {{3}}, pages = {{219--228}}, publisher = {{Hindawi Publishing Corporation}}, title = {{{Spatial dynamics of tuned and mistuned bladed disks with cylindrical and wedge-shaped friction dampers}}}, volume = {{9}}, year = {{2003}}, } @article{8939, author = {{Popp, Karl and Panning, Lars and Sextro, Walter}}, journal = {{Journal of Vibration and Control}}, pages = {{419--448}}, title = {{{Vibration Damping by Friction Forces -Theory and Applications}}}, volume = {{9}}, year = {{2003}}, } @inproceedings{8940, author = {{Sextro, Walter and Popp, Karl}}, booktitle = {{Forschungsvereinigung Verbrennungskraftmaschinen (FW)}}, number = {{753}}, pages = {{40}}, title = {{{Optimierung des Schwingungsverhaltens elastischer Strukturen mit Reibfugen am Beispiel von Turbomaschinenschaufeln}}}, year = {{2003}}, } @inproceedings{8941, abstract = {{Numerical predictions of the forced vibration of a disc assembly including frictional effects between the shrouds are presented concerning engineering needs for the blade design process. Assuming a tuned disc assembly, numerical static, free and then forced vibration analyses of a shrouded turbine blade measured in the spin pit are performed systematically. For the excitation forces of an air jet evaluated from the fairly linear behavior of the experimental blade resonance peaks, the reliability of the proposed approach is validated through the very close agreement of the computed and measured resonant peaks. These resonant peaks demonstrate either a fairly linear behavior or a non-linear one like the jump effect of blade resonance amplitudes, or elastic impacts between the shrouds. Also, the damping performance for different contact configurations between the shrouds is numerically analyzed. These numerical results indicate that the shrouds generate higher frictional damping for small angles (0--30 deg) between the circumferential direction and the normal vector to the contact surface. Copyright {\copyright} 2003 by ASME}}, author = {{Szwedowicz, J and Sextro, Walter and Visser, R and Masserey, P.A}}, booktitle = {{ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference}}, isbn = {{0-7918-3687-8}}, keywords = {{Turbine blades, Vibration}}, number = {{GT2003-38808}}, title = {{{On forced vibration of shrouded turbine blades}}}, doi = {{doi:10.1115/GT2003-38808}}, year = {{2003}}, } @article{4896, author = {{Eggert, Andreas and Helm, Sabrina}}, issn = {{0019-8501}}, journal = {{Industrial Marketing Management}}, number = {{2}}, pages = {{101--108}}, publisher = {{Elsevier BV}}, title = {{{Exploring the impact of relationship transparency on business relationships: A Cross-Sectional Study Among Purchasing Managers in Germany}}}, doi = {{10.1016/s0019-8501(02)00224-9}}, volume = {{32}}, year = {{2003}}, } @inproceedings{862, author = {{Aguiar, Ana and Karl, Holger and Wolisz, Adam and Miesmer, Horst}}, booktitle = {{Proceedings of the International Conference on Wireless Networks, ICWN '03, June 23 - 26, 2003, Las Vegas, Nevada, {USA}}}, pages = {{3----9}}, title = {{{A Framework for Evaluating Effects of Channel Prediction Inaccuracy on the Performance of Channel Adaptive Techniques}}}, year = {{2003}}, }