@inproceedings{9573, abstract = {{Integrating dependability in self-optimizing systems is a challenging task. Self-optimizing systems incorporate on the one hand the opportunity to apply novel solutions to complex mechatronic systems, but on the other hand constitute a possible risk because of non-determined behavior. The dependability concept in this paper covers both aspects: Increasing safety with selfoptimization and minimizing the risk of self-optimization. This dependability concept is combined with the self-optimization process of the active guidance module which is currently under development at the Collaborative Research Center 614 at the University of Paderborn.}}, author = {{Sondermann-Wölke, Christoph and Geisler, Jens and Müler, Thomas and Trächtler, Ansgar and Böcker, Joachim}}, booktitle = {{ASME 2008 -- International Design Engineering Technical Conferences \& Computers and Information in Engineering Conference (IDETC/CIE)}}, title = {{{The active guidance module of a rail-bound vehicle as an application for the dependability oriented design in self-optimizing systems}}}, year = {{2008}}, } @article{9574, abstract = {{For devices having non-linear contact, load plays a fundamental role. Variations in the characteristics of the load cause change in eigenfrequency and amplitude of the vibration. In most technical applications, this unwanted behaviour is cancelled by the use of control algorithms. However, multiple applications, like bond quality monitoring or chemical and pressure sensors, have found that the load may be characterised by interpreting the change in characteristics of a resonant vibrating device used as a sensor. Surgical resection of tumours is a very difficult task. After localising the tumour by the use of imaging techniques, the resection demands the surgeon to decide where and what to resect based on visual and tactile differentiation of tumour and healthy tissue. Exactness of this process could be enhanced if we can provide the surgeon with a device capable of evaluating mechanical characteristics of the tissue much more accurately than the surgeon himself can do. As the mechanical characteristics of tumour and healthy tissue differ but slightly, the task is to design a system with high sensitivity. Therefore, we have developed a resonant actuator-sensor that allows the differentiation among distinct media that have similar mechanical characteristics to tumour and healthy tissue using a piezoelectric bimorph. The design is based on the detection and evaluation of frequency shift and amplitude variation of the fundamental and higher harmonics using one layer for the resonant excitation of vibration and the other one as the sensing element.}}, author = {{Stroop, Ralf and Uribe, David Oliva and Martinez, Melisa Orta and Brökelmann, Michael and Hemsel, Tobias and Wallaschek, Jörg}}, issn = {{1385-3449}}, journal = {{Journal of Electroceramics}}, keywords = {{Piezo ceramics, Bimorph, Tactile sensor, Tumour tissue}}, number = {{3-4}}, pages = {{237--241}}, publisher = {{Springer US}}, title = {{{Tactile tissue characterisation by piezoelectric systems}}}, doi = {{10.1007/s10832-007-9183-6}}, volume = {{20}}, year = {{2008}}, } @article{9575, abstract = {{Many ultrasonic processes are based on the mechanical contact of oscillating parts. Within ultrasonic machining (drilling, milling, grinding) micro impacts lead to abrasion at the processed workpiece and hopefully do not damage the tool. In ultrasonic motors ideally neither part gets worn. Thus the appropriate design of contact partners as well as their kinematics is a substantial task during the development of such devices. A first step to optimize contact mechanics is to understand their behavior and dependencies on parameter variations, such as vibration amplitude and pre-stress of the impacting parts. For a detailed understanding models validated with convincing experimental data from measurements are absolutely essential. This paper focuses on simple vibro-impact experiments which can be used as benchmark data for future models. The setup of the experiment and first experimental investigations are described in detail.}}, author = {{Twiefel, Jens and Potthast, Christian and Mracek, Maik and Hemsel, Tobias and Sattel, Thomas and Wallaschek, Jörg}}, issn = {{1385-3449}}, journal = {{Journal of Electroceramics}}, keywords = {{Contact measurements, Vibro-impact, Ultrasonic application}}, number = {{3-4}}, pages = {{209--214}}, publisher = {{Springer US}}, title = {{{Fundamental experiments as benchmark problems for modeling ultrasonic micro-impact processes}}}, doi = {{10.1007/s10832-007-9169-4}}, volume = {{20}}, year = {{2008}}, } @inproceedings{9576, abstract = {{In neurosurgery, delineation of tumor boundaries during resection of brain tumors is of substantial relevance. During operation distinction between tumor and healthy tissue rely on the abilities of the surgeon based on visual and tactile differentiation. In this paper a high sensitivity actuator-sensor system using a piezoelectric bimorph is presented. Frequency shift and transfer function of the bimorphpsilas voltages are detected and evaluated. Sensorpsilas sensitivity is evaluated using two frequency controls strategies: A phase-locked loop (PLL) and a self-oscillating circuit. Results of measurements conducted on gel-phantoms are presented and discussed.}}, author = {{Uribe, David Oliva and Stroop, Ralf and Hemsel, Tobias and Wallaschek, Jörg}}, booktitle = {{Frequency Control Symposium, 2008 IEEE International}}, issn = {{1075-6787}}, keywords = {{biomedical measurement, brain, cancer, neurophysiology, phantoms, phase locked loops, piezoelectric actuators, surgery, tactile sensors, transfer functions, tumours, PLL, biomedical tissue differentiation system, brain tumor resection, frequency control, frequency shift, gel-phantom, high sensitivity actuator-sensor system, neurosurgery, phase-locked loop, piezoelectric actuators, piezoelectric bimorph, self-oscillating circuit, sensor sensitivity, tactile differentiation, tactile sensor system, transfer function, tumor boundary, visual differentiation, Biomedical measurements, Circuits, Frequency control, Neoplasms, Neurosurgery, Phase locked loops, Piezoelectric actuators, Surges, Transfer functions, Voltage}}, pages = {{91--94}}, title = {{{Development of a biomedical tissue differentiation system using piezoelectric actuators}}}, doi = {{10.1109/FREQ.2008.4622963}}, year = {{2008}}, } @inbook{9590, author = {{Beutner, Marc}}, booktitle = {{Qualität in Schule und Betrieb. Forschungsergebnisse und gute Praxis}}, editor = {{Bals, T and Hegemann, K and Wilbers, K}}, pages = {{333 -- 344}}, title = {{{Evaluation von Standards und Evaluation für Standards. Zentraler Tagungsband der 15. Hochschultage Berufliche Bildung}}}, year = {{2008}}, } @misc{9640, author = {{Tönnies, Merle}}, booktitle = {{Archiv für das Studium der neueren Sprachen und Literaturen}}, number = {{1}}, pages = {{155--156}}, title = {{{Caselli, D.: Beckett's Dante}}}, volume = {{245}}, year = {{2008}}, } @inbook{9702, author = {{Strauß, Sara}}, booktitle = {{Peter Ustinov als Autor – Eine Einführung}}, editor = {{Breuer, Rolf}}, pages = {{170--173}}, publisher = {{Fink}}, title = {{{The Frontiers of the Sea}}}, year = {{2008}}, } @inbook{9703, author = {{Strauß, Sara}}, booktitle = {{Peter Ustinov als Autor – Eine Einführung}}, editor = {{Breuer, Rolf}}, pages = {{178--181}}, publisher = {{Fink}}, title = {{{A Nose By Any Other Name}}}, year = {{2008}}, } @article{4156, author = {{Hehenkamp, Burkhard and Kaarbøe, Oddvar M.}}, issn = {{0165-1889}}, journal = {{Journal of Economic Dynamics and Control}}, number = {{5}}, pages = {{1357--1380}}, publisher = {{Elsevier BV}}, title = {{{Imitators and optimizers in a changing environment}}}, doi = {{10.1016/j.jedc.2007.06.001}}, volume = {{32}}, year = {{2008}}, } @article{4187, abstract = {{We study phonon-assisted electron tunneling in semiconductor quantum dot molecules. In particular, singletsinglet relaxation in a two-electron-doped structure is considered. The influence of Coulomb interaction is discussed via comparison with a single-electron system. We find that the relaxation rate reaches similar values in the two cases but the Coulomb interaction shifts the maximum rates toward larger separations between the dots. The difference in electron-phonon interaction between deformation potential and piezoelectric coupling is investigated. We show that the phonon-induced tunneling between two-electron singlet states is a fast process, taking place on the time scales of the order of a few tens of picoseconds.}}, author = {{Grodecka, A. and Machnikowski, P. and Förstner, Jens}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, keywords = {{tet_topic_qd}}, number = {{8}}, publisher = {{American Physical Society (APS)}}, title = {{{Phonon-assisted tunneling between singlet states in two-electron quantum dot molecules}}}, doi = {{10.1103/physrevb.78.085302}}, volume = {{78}}, year = {{2008}}, } @article{4229, abstract = {{The precipitation process of silicon carbide in heavily carbon doped silicon is not yet fully understood. High resolution transmission electron microscopy observations suggest that in a first step carbon atoms form C Si dumbbells on regular Si lattice sites which agglomerate into large clusters. In a second step, when the cluster size reaches a radius of a fewnm, the high interfacial energy due to the SiC/Si lattice misfit of almost 20% is overcome and the precipitation occurs. By simulation, details of the precipitation process can be obtained on the atomic level. A recently proposed parametrization of a Tersoff-like bond order potential is used to model the system appropriately. Preliminary results gained by molecular dynamics simulations using this potential are presented.}}, author = {{Zirkelbach, F. and Lindner, Jörg and Nordlund, K. and Stritzker, B.}}, issn = {{0921-5107}}, journal = {{Materials Science and Engineering: B}}, pages = {{149--152}}, publisher = {{Elsevier BV}}, title = {{{Molecular dynamics simulation of defect formation and precipitation in heavily carbon doped silicon}}}, doi = {{10.1016/j.mseb.2008.10.010}}, volume = {{159-160}}, year = {{2008}}, } @article{4256, abstract = {{We present phase-resolved pulse propagation measurements that allow us to fully describe the transition between several light–matter interaction regimes. The complete range from linear excitation to the breakdown of the photonic bandgap on to self-induced transmission and self-phase modulation is studied on a high-quality multiple-quantum-well Bragg structure. An improved fast-scanning cross-correlation frequency-resolved optical gating setup is applied to retrieve the pulse phase with an excellent signal-tonoise ratio. Calculations using the semiconductor Maxwell–Bloch equations show qualitative agreement with the experimental findings. }}, author = {{zu Siederdissen, Tilman Höner and Nielsen, Nils C. and Kuhl, Jürgen and Schaarschmidt, Martin and Förstner, Jens and Knorr, Andreas and Khitrova, Galina and Gibbs, Hyatt M. and Koch, Stephan W. and Giessen, Harald}}, issn = {{0146-9592}}, journal = {{Optics Letters}}, keywords = {{tet_topic_polariton, tet_topic_qw}}, number = {{11}}, publisher = {{The Optical Society}}, title = {{{Transition between different coherent light–matter interaction regimes analyzed by phase-resolved pulse propagation}}}, doi = {{10.1364/ol.30.001384}}, volume = {{30}}, year = {{2008}}, } @article{4317, abstract = {{Phonon-assisted singlet-singlet relaxation in semiconductor quantum dot molecules is studied theoretically. Laterally coupled quantum dot structures doped with two electrons are considered. We take into account interaction with acoustic phonon modes via deformation potential and piezoelectric coupling. We show that piezoelectric mechanism for the considered system is of great importance and for some ranges of quantum dot molecule parameters is the dominant contribution to relaxation. It is shown that the phonon-assisted tunneling is much faster (down to ∼ 6 ps even at zero temperature) in comparison with other decoherence processes. The influence of Coulomb interaction is discussed and its consequences are indicated. We calculate the relaxation rates for GaAs quantum dot molecules and study the dependence on quantum dot size, distance and offset between the constituent quantum dots. In addition the temperature dependence of the tunneling rates is analyzed.}}, author = {{Grodecka, Anna and Machnikowski, Paweł and Förstner, Jens}}, issn = {{1610-1634}}, journal = {{physica status solidi (c)}}, keywords = {{tet_topic_qd}}, number = {{2}}, pages = {{474--478}}, publisher = {{Wiley}}, title = {{{Theoretical study of phononassisted singlet-singlet relaxation in two-electron semiconductor quantum dot molecules}}}, doi = {{10.1002/pssc.200880319}}, volume = {{6}}, year = {{2008}}, } @inbook{5061, author = {{Backhaus, Klaus and Becker, Jörg and Beverungen, Daniel and Knackstedt, Ralf and Weddeling, Matthias}}, booktitle = {{Technologie und Dienstleistung: Innovationen in Forschung, Wissenschaft und Unternehmen Beiträge der 7. Dienstleistungstagung des BMBF}}, editor = {{Gatermann, Inken and Fleck, Myriam}}, pages = {{383----391}}, title = {{{Zahlungsbereitschaften für Geschäftsmodelle produktbegleitender Dienstleistungen --- Wirtschaftlichkeit bei der Vermarktung hybrider Produkte}}}, year = {{2008}}, } @inbook{5062, author = {{Becker, J and Beverungen, Daniel and Knackstedt, R and Glauner, C and Stypmann, M and Rosenkranz, C and Schmitt, R and Hatfield, S and Schmitz, G and Eberhardt, S and Dietz, M and Thomas, O and Walter, P and Lönngren, H and Leimeister, J}}, booktitle = {{Dienstleistungsmodellierung --- Methoden, Werkzeuge und Branchenlösungen}}, editor = {{Thomas, O. and Nüttgens, M.}}, isbn = {{978-3-7908-2098-0}}, pages = {{109----128}}, title = {{{Ordnungsrahmen für die hybride Wertschöpfung}}}, doi = {{10.1007/978-3-7908-2099-7}}, year = {{2008}}, } @inbook{5064, author = {{Becker, Jörg and Beverungen, Daniel and Knackstedt, Ralf}}, booktitle = {{Wertschöpfungsnetzwerke --- Konzepte für das Netzwerkmanagement und Potenziale aktueller Informationstechnologien}}, editor = {{Becker, Jörg and Knackstedt, Ralf and Pfeiffer, Daniel}}, isbn = {{978-3-7908-2055-3}}, pages = {{3----31}}, title = {{{Wertschöpfungsnetzwerke von Produzenten und Dienstleistern als Option zur Organisation der Erstellung hybrider Leistungsbündel}}}, doi = {{10.1007/978-3-7908-2056-0_1}}, year = {{2008}}, } @inbook{5065, author = {{Becker, Jörg and Beverungen, Daniel and Knackstedt, Ralf and Müller, Oliver}}, booktitle = {{Dienstleistungsmodellierung --- Methoden, Werkzeuge und Branchenlösungen}}, editor = {{Thomas, Oliver and Nüttgens, Markus}}, isbn = {{978-3790820980}}, pages = {{53----70}}, title = {{{Konzeption einer Modellierungssprache zur softwarewerkzeugunterstützten Modellierung, Konfiguration und Bewertung hybrider Leistungsbündel}}}, year = {{2008}}, } @inbook{5067, author = {{Becker, Jörg and Winkelmann, Axel and Beverungen, Daniel and Janiesch, Christian}}, booktitle = {{Wertschöpfungsnetzwerke: Konzepte für das Netzwerkmanagement und Potenziale aktueller Informationstechnologien}}, editor = {{Becker, Jörg and Knackstedt, Ralf and Pfeiffer, Daniel}}, isbn = {{978-3790820553}}, pages = {{193----208}}, title = {{{Stammdatenkonzept für elektronische Verkaufsförderungsaktionen im Wertschöpfungsdreieck Hersteller, Händler und Kunde}}}, year = {{2008}}, } @inbook{5177, abstract = {{Die Trennung von Netz und Betrieb steht nicht nur im Zentrum der politischen Debatte der Energiewirtschaft. Auch im Bahnsektor ist die Privatisierung mit oder ohne Netz ein heiß diskutiertes Thema. Und selbst in der Telekommunikation strebt die EU-Kommission eine weitgehende Entflechtung an. Der vorliegende Beitrag entwickelt anhand von ökonomischen Kriterien ein ideologiefreies Prüfschema, wann eine Entflechtung von Netz und Betrieb gesamtwirtschaftlich vorteilhaft ist und wann nicht. }}, author = {{Haucap, Justus and Heimeshoff, Ulrich and Uhde, André}}, booktitle = {{BDI-Bundesnetzagentur-Regulierungskonferenz 2008}}, pages = {{15--21}}, title = {{{Trennung von Netz und Betrieb als Königsweg? Pfadabhängigkeiten der Regulierung}}}, year = {{2008}}, } @techreport{5369, author = {{Broll, Udo and Gilroy, Bernard Michael and Lukas, Elmar}}, title = {{{Export production under exchange rate uncertainty}}}, year = {{2008}}, }