@article{13655, author = {{Thissen, P. and Grundmeier, Guido and Wippermann, S. and Schmidt, Wolf Gero}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{24}}, title = {{{Water adsorption on the α-Al2O3(0001) surface}}}, doi = {{10.1103/physrevb.80.245403}}, volume = {{80}}, year = {{2009}}, } @book{63089, author = {{Fechner, Sabine}}, publisher = {{Logos}}, title = {{{Effects of context-oriented learning on student interest and achievement in chemistry education}}}, volume = {{95}}, year = {{2009}}, } @article{13844, abstract = {{EPR and ESE in nitrogen doped 4H- and 6H-SiC show besides the well known triplet lines of 14N on quasi-cubic (Nc,k) and hexagonal (Nc,h) sites additional lines (Nx) of comparatively low intensity providing half the hf splitting of Nc,k. Frequently re-interpreted as spin-forbid¬den lines, arising from Nc,k pairs and triads or resulting from hopping conductivity, only re¬cent¬ly the theoretical calculation of the corresponding g-tensors lead to a tentative model of distant NC donor pairs on inequivalent lattice sites which are coupled to S = 1 assuming a fine-struc¬ture splitting too small to be observed in the EPR and ESE experiments. In this work, we pre¬sent ESE nutation measurements confirming S = 1 for the Nx center. Analysing the nutation frequencies in comparison with that of the Nc,k (S = 1/2) spectrum as well as the line width of ESE and EPR spectra we obtain a rough estimate between 5104 cm-1 and 50104 cm-1 for the fine-structure splitting demonstrating efficient spin-coupling between nitrogen donors in 4H-SiC.}}, author = {{Savchenko, D.V. and Pöppl, Andreas and Kalabukhova, Ekaterina N. and Greulich-Weber, Siegmund and Rauls, Eva and Schmidt, Wolf Gero and Gerstmann, Uwe}}, issn = {{1662-9752}}, journal = {{Materials Science Forum}}, pages = {{343--346}}, title = {{{Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC}}}, doi = {{10.4028/www.scientific.net/msf.615-617.343}}, volume = {{615-617}}, year = {{2009}}, } @inproceedings{18634, abstract = {{A computational method to obtain optical conductivities from first principles is presented. It exploits a relation between the conductivity and the complex dielectric function, which is constructed from the full electronic band structure within the random-phase approximation. In contrast to the Drude model, no empirical parameters are used. As interband transitions as well as local-field effects are properly included, the calculated spectra are valid over a wide frequency range. As an illustration I present quantitative results for selected simple metals, noble metals, and ferromagnetic transition metals. The implementation is based on the full-potential linearized augmented-plane-wave method.}}, author = {{Schindlmayr, Arno}}, booktitle = {{Theoretical and Computational Nanophotonics: Proceedings of the 2nd International Workshop}}, editor = {{Chigrin, Dmitry N.}}, isbn = {{978-0-7354-0715-2}}, issn = {{1551-7616}}, location = {{Bad Honnef}}, number = {{1}}, pages = {{157--159}}, publisher = {{American Institute of Physics}}, title = {{{Optical conductivity of metals from first principles}}}, doi = {{10.1063/1.3253897}}, volume = {{1176}}, year = {{2009}}, } @inproceedings{4181, abstract = {{We experimentally and theoretically investigate microdisk resonators with embedded quantum dots immersed in a liquid crystal in its nematic phase, showing the tunabililty of the photonic modes via external parameters like temperature or electric field.}}, author = {{Förstner, Jens and Meier, Cedrik and Piegdon, Karoline and Declair, Stefan and Hoischen, Andreas and Urbanski, Mark and Meier, Torsten and Kitzerow, Heinz-Siegfried}}, booktitle = {{Advances in Optical Sciences Congress}}, isbn = {{9781557528735}}, keywords = {{tet_topic_microdisk}}, location = {{Honolulu, Hawaii United States}}, publisher = {{OSA Technical Digest (CD) (Optical Society of America, 2009), paper NTuC2}}, title = {{{Coupling Dynamics of Quantum Dots in a Liquid-Crystal-Tunable Microdisk Resonator}}}, doi = {{10.1364/nlo.2009.ntuc2}}, year = {{2009}}, } @article{2503, author = {{Haake, Claus-Jochen and Kashiwada, Akemi and Su, Francis Edward}}, issn = {{0303-6812}}, journal = {{Journal of Mathematical Biology}}, number = {{4}}, pages = {{479--497}}, publisher = {{Springer Nature}}, title = {{{The Shapley value of phylogenetic trees}}}, doi = {{10.1007/s00285-007-0126-2}}, volume = {{56}}, year = {{2008}}, } @article{2530, author = {{Haake, Claus-Jochen}}, issn = {{1134-5764}}, journal = {{TOP}}, number = {{1}}, pages = {{48--50}}, publisher = {{Springer Nature}}, title = {{{Comments on: Transversality of the Shapley value}}}, doi = {{10.1007/s11750-008-0047-2}}, volume = {{16}}, year = {{2008}}, } @techreport{19688, abstract = {{We study the problem of computing approximate Nash equilibria (epsilon-Nash equilibria) in normal form games, where the number of players is a small constant. We consider the approach of looking for solutions with constant support size. It is known from recent work that in the 2-player case, a 1/2-Nash equilibrium can be easily found, but in general one cannot achieve a smaller value of epsilon than 1/2. In this paper we extend those results to the k-player case, and find that epsilon = 1-1/k is feasible, but cannot be improved upon. We show how stronger results for the 2-player case may be used in order to slightly improve upon the epsilon = 1-1/k obtained in the k-player case.}}, author = {{Briest, Patrick and Goldberg, Paul W. and Roeglin, Heiko}}, title = {{{Approximate Equilibria in Games with Few Players}}}, year = {{2008}}, } @inproceedings{3146, author = {{Jager, Tibor and Jäkel, Heiko and Schwenk, Jörg}}, booktitle = {{Sicherheit 2008: Sicherheit, Schutz und Zuverlässigkeit. Konferenzband der 4. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft für Informatik e.V. (GI), 2.-4. April 2008 im Saarbrücker Schloss.}}, pages = {{127----136}}, title = {{{Nutzung von selbstsignierten Client-Zertifikaten zur Authentifikation bei SSL/TLS}}}, year = {{2008}}, } @inbook{1109, author = {{Geierhos, Michaela and Bsiri, Sandra}}, booktitle = {{Linguistics, Computer Science and Language Processing: Festschrift for Franz Guenthner on the Occasion of His 60th Birthday (Tributes 6)}}, editor = {{Gross , Gaston and Schulz, Klaus U.}}, isbn = {{978-1-904987-80-2}}, pages = {{103--126}}, publisher = {{College Publications}}, title = {{{ProfilPro: Reconstitution automatique d'un profil professionnel à partir des documents du Web}}}, volume = {{6}}, year = {{2008}}, } @inproceedings{20966, abstract = {{To cope with the high complexity of software in advanced technical systems, the software of these systems is often built in a component-based fashion. The growing usage of self-adaptive techniques leads to sophisticated reconfigurations of the software component structures during runtime. Current modeling approaches for component-based software systems do not include a transformation language for the specification of component structure reconfigurations. In this paper we therefore introduce an extension of a component-based modeling approach. This extension enables (1) the specification of hierarchical component structures and (2) the specification of structural transformations based on the specified hierarchical component structures. Further, as we consider mechatronic systems, we also show the predictable runtime behavior of the transformations.}}, author = {{Tichy, Matthias and Henkler, Stefan and Holtmann, Jörg and Oberthür, Simon}}, booktitle = {{Proceedings of the 4th Workshop on Object-oriented Modeling of Embedded Real-Time Systems (OMER 4), Paderborn, Germany}}, pages = {{27--38}}, publisher = {{Heinz Nixdorf Institut}}, title = {{{Component Story Diagrams: A Transformation Language for Component Structures in Mechatronic Systems}}}, volume = {{236}}, year = {{2008}}, } @inbook{17899, author = {{Mindt, Ilka and Römer, Ute}}, booktitle = {{Anglistik. International Journal of English Studies, 19, 2}}, pages = {{235 -- 239}}, publisher = {{John Benjamins, 2005}}, title = {{{Progressives, Patterns, Pedagogy. A corpus-driven approach to English progressive forms, functions, contexts and diadactic}}}, year = {{2008}}, } @inproceedings{19004, abstract = {{We present a deterministic kinetic data structure for the facility location problem that maintains a subset of the moving points as facilities such that, at any point of time, the sum of the maintenance cost for the facilities and the connection cost for the clients is at most a constant factor larger than the current optimal cost. In our scenario, each point can open a facility and moves continuously along a known trajectory in a d-dimensional Euclidean space where d is a constant. Our kinetic data structure has a storage requirement of O(n (log^d(n)+log(nR))), where n is the number of points and R is the ratio of the product of the maximum maintenance cost and demand to the product of their corresponding minimum values. In the case that each trajectory can be described by a bounded degree polynomial, the data structure processes O(n^2 log^2(nR)) events, each requiring only O(log(nR)) facility changes and O(log^(d+1)(n) log(nR)) time. This results in a total processing time of O(n^2 log^(d+1)(n) log^3(nR)). To the best of our knowledge, this is the first kinetic data structure for the facility location problem.}}, author = {{Gehweiler, Joachim and Lammersen, Christiane and Degener, Bastian}}, booktitle = {{Proceedings of the 24th European Workshop on Computational Geometry}}, pages = {{251--254}}, title = {{{The Kinetic Facility Location Problem}}}, year = {{2008}}, } @inbook{1942, author = {{Scheideler, Christian}}, booktitle = {{Taschenbuch der Algorithmen}}, isbn = {{978-3-540-76393-2}}, pages = {{229----236}}, publisher = {{Springer}}, title = {{{Broadcasting: Wie verbreite ich schnell Informationen?}}}, doi = {{10.1007/978-3-540-76394-9_22}}, year = {{2008}}, } @book{1945, author = {{Vöcking, Berthold and Alt, Helmut and Dietzfelbinger, Martin and Reischuk, Rüdiger and Scheideler, Christian and Vollmer, Heribert and Wagner, Dorothea}}, isbn = {{978-3-540-76393-2}}, title = {{{Taschenbuch der Algorithmen}}}, year = {{2008}}, } @article{18570, abstract = {{We present a game theoretic study of hybrid communication networks in which mobile devices can connect in an ad hoc fashion to a base station, possibly via a few hops using other mobile devices as intermediate nodes. The maximal number of allowed hops might be bounded with the motivation to guarantee small latency. We introduce hybrid connectivity games to study the impact of selfishness on this kind of infrastructure. Mobile devices are represented by selfish players, each of which aims at establishing an uplink path to the base station minimizing its individual cost. Our model assumes that intermediate nodes on an uplink path are reimbursed for transmitting the packets of other devices. The reimbursements can be paid either by a benevolent network operator or by the senders of the packets using micropayments via a clearing agency that possibly collects a small percentage as commission. These different ways to implement the payments lead to different variants of the hybrid connectivity game. Our main findings are: (1) If there is no constraint on the number of allowed hops on the path to the base station, then the existence of equilibria is guaranteed regardless of whether the network operator or the senders pay for forwarding packets. (2) If the network operator pays, then the existence of equilibria is guaranteed only if at most one intermediate node is allowed, i.e., for at most two hops on the uplink path of a device, but not if the maximal number of allowed hops is three or larger. (3) In contrast, if the senders pay for forwarding their packets, then equilibria are guaranteed to exist given any bound on the number of allowed hops. The equilibrium analysis presented in this paper gives a first game theoretical motivation for the implementation of micropayment schemes in which senders pay for forwarding their packets. We further support this evidence by giving an upper bound on the Price of Anarchy for this kind of hybrid connectivity games that is independent of the number of nodes, but only depends on the number of hops and the power gradient.}}, author = {{Ackermann, Heiner and Briest, Patrick and Fanghänel, Alexander and Vöcking, Berthold}}, isbn = {{9783540771043}}, journal = {{Internet Mathematics}}, number = {{4}}, pages = {{459--475}}, publisher = {{Springer}}, title = {{{Who Should Pay for Forwarding Packets?}}}, doi = {{10.1007/978-3-540-77105-0_21}}, volume = {{5}}, year = {{2008}}, } @inproceedings{22342, author = {{Schmidt, Alexander and Adelt, Philipp and Esau, Natascha}}, booktitle = {{International Conference on Instrumentation, Control and Information Technology}}, isbn = {{978-4-907764-30-2}}, pages = {{653--658}}, publisher = {{Society of Instrument and Control Engineers (SICE)}}, title = {{{Integrating dynamic track sectioning into a hybrid planning infrastructure}}}, doi = {{10.1109/SICE.2008.4654737}}, volume = {{47}}, year = {{2008}}, } @book{22349, author = {{Klöpper, Benjamin and Romaus, Christoph and Schmidt, Alexander and Vöcking, Henner}}, isbn = {{978-3-939350-42-2}}, pages = {{377--393}}, publisher = {{W. V. Westfalia Druck GmbH }}, title = {{{A Multi-Agent Planning Problem for the Coordination of Function Modules}}}, year = {{2008}}, } @book{22350, author = {{Gausemeier, Jürgen and Donoth, Jörg and Pook, Sebastian and Zimmer, Detmar and Schmidt, Alexander}}, isbn = {{978-3-939350-42-2}}, pages = {{35--51}}, publisher = {{W. V. Westfalia Druck GmbH }}, title = {{{Conceptual Design of Self-Optimizing Mechatronic Systems}}}, year = {{2008}}, } @inproceedings{9570, abstract = {{EN: Although the use of new actuator technologies is quite enthusiastic, the realization of innovative systems based on these principles fails because of doubts in dependability. Until now, new working principles for actuators have not been systematically investigated in the means of dependability. Therefore we developed a proceeding for a dependability-oriented evaluation of technologies. This is shown in the case of shape memory alloy actuators. DE: Die Realisierung von Systemen mittels innovativer Aktortechnologien scheitert oftmals an der Skepsis gegenüber der Verlässlichkeit (Vertrauen in die zuverlässige und sichere Funktionalität der Technologie). Diese liegt darin begründet, dass neue Aktortechnologien bzw. die Integration von innovativen physikalischen Wirkprinzipen innerhalb neuer Aktorkonzepte bisher noch nicht systematisch im Kontext der Verlässlichkeit untersucht werden. Daher haben wir ein Vorgehen zur verlässlichkeitsorientierten Technologiebewertung entwickelt. Neben der detaillierten Darstellung des Vorgehensmodells wird es exemplarisch anhand von Formgedächtnislegierungen zur Entwicklung innovativer Antriebslösungen angewendet.}}, author = {{Müller, Thomas and Schiedeck, Florian and Hemsel, Tobias}}, booktitle = {{2. Tagung des DVM -- Arbeitskreis Zuverlässigkeit mechatronischer und adaptronischer Systeme: Absicherung der Systemzuverlässigkeit, Koblenz}}, keywords = {{EN: Dependability, Reliability, Evaluation of Technology, Actuators, Shape Memory Alloys DE: Verl{\}}, title = {{{Verlässlichkeitorientierte Technologiebewertung innovativer Aktortechnologien am Beispiel von Formgedächtnislegierungen}}}, year = {{2008}}, }