@inproceedings{15099, author = {{Bätz, Alexander and Böttcher, Stefan and Hartel, Rita}}, booktitle = {{Advances in Databases - 28th British National Conference on Databases, BNCOD 28, Revised Selected Papers}}, isbn = {{9783642245763}}, issn = {{0302-9743}}, pages = {{154--166}}, publisher = {{Springer}}, title = {{{Updates on Grammar-Compressed XML Data}}}, doi = {{10.1007/978-3-642-24577-0_17}}, year = {{2011}}, } @inproceedings{15100, author = {{Böttcher, Stefan and Hartel, Rita and Stey, Sebastian}}, booktitle = {{Advances in Databases - 28th British National Conference on Databases, BNCOD 28, Revised Selected Papers}}, isbn = {{9783642245763}}, issn = {{0302-9743}}, pages = {{182--193}}, publisher = {{Springer}}, title = {{{TraCX: Transformation of Compressed XML}}}, doi = {{10.1007/978-3-642-24577-0_19}}, year = {{2011}}, } @inproceedings{15102, author = {{Böttcher, Stefan and Bültmann, Alexander and Hartel, Rita}}, booktitle = {{2011 Data Compression Conference}}, isbn = {{9781612842790}}, pages = {{403--412}}, publisher = {{IEEE}}, title = {{{Search and Modification in Compressed Texts}}}, doi = {{10.1109/dcc.2011.47}}, year = {{2011}}, } @inproceedings{15103, author = {{Böttcher, Stefan and Fernhomberg, Lars and Hartel, Rita}}, booktitle = {{WEBIST 2011, Proceedings of the 7th International Conference on Web Information Systems and Technologies}}, pages = {{80--87}}, publisher = {{SciTePress}}, title = {{{Enhancing XML-cache Efficiency by XML Compression}}}, year = {{2011}}, } @inproceedings{15104, author = {{Böttcher, Stefan and Fernhomberg, Lars and Hartel, Rita}}, booktitle = {{Web Information Systems and Technologies - 7th International Conference, WEBIST 2011, Revised Selected Papers}}, isbn = {{9783642280818}}, issn = {{1865-1348}}, pages = {{116--130}}, publisher = {{Springer}}, title = {{{Reducing Data Transfer by Combining XML-Compression and XML-Caching}}}, doi = {{10.1007/978-3-642-28082-5_9}}, year = {{2011}}, } @inproceedings{15115, author = {{Nasiri, M. and Hüllermeier, Eyke and Senge, Robin and Lughofer, E.}}, booktitle = {{in Proceedings IFSA-2011 World Congress of the International Fuzzy Systems Association, Surabaya and Bali Island, Indonesia}}, pages = {{RW--103--1--6}}, title = {{{Comparing methods for knowledge-driven and data-driven fuzzy modeling: A case study in textile industry}}}, year = {{2011}}, } @inproceedings{15116, author = {{Lughofer, E. and Hüllermeier, Eyke}}, booktitle = {{in Proceedings EUSFLAT-2011 7th International Conference on the European Society for Fuzzy Logic and Technology, Aix-les-Bains, France}}, editor = {{Galichet, S. and Montero, J. and Mauris, G.}}, pages = {{380--387}}, title = {{{On-line redundancy deletion in evolving fuzzy regression models using a fuzzy inclusion measure}}}, year = {{2011}}, } @inproceedings{15117, author = {{Fallah Tehrani, A. and Cheng, W. and Hüllermeier, Eyke}}, booktitle = {{in Proceedings EUSFLAT-2011 7th International Conference on the European Society for Fuzzy Logic and Technology, Aix-les-Bains, France}}, pages = {{868--875}}, title = {{{Choquistic regression: Generalizing logistic regression using the Choquet integral}}}, year = {{2011}}, } @inbook{15127, author = {{Domik, Gitta and Fischer, Gerhard}}, booktitle = {{Rainbow of computer science}}, isbn = {{978-3-642-19390-3}}, pages = {{129--143}}, publisher = {{Springer}}, title = {{{Transdisciplinary collaboration and lifelong learning: fostering and supporting new learning opportunities}}}, doi = {{10.1007/978-3-642-19391-0_10}}, year = {{2011}}, } @inproceedings{15181, author = {{Böttcher, Stefan and Hartel, Rita and Hawicks, Heike}}, booktitle = {{XXIV ICOS Internationales Kongress für Namensforschung}}, title = {{{Namenlemmatisierung in der Web-Datenbank mittelalterlicher und frühneuzeitlicher Universitätsmatrikel}}}, year = {{2011}}, } @inproceedings{15193, author = {{Domik, Gitta and Arens, Stephan and Scharlau, Ingrid and Hilkenmeier, Frederic}}, booktitle = {{INFORMATIK 2011 – Informatik schafft Communities}}, isbn = {{978-88579-286-4}}, number = {{324}}, pages = {{437}}, publisher = {{Gesellschaft für Informatik e.V.}}, title = {{{How useful is computer graphics for medical diagnoses?}}}, year = {{2011}}, } @article{15969, author = {{Lauter, Christian and Sarrazin, M. and Tröster, Thomas}}, journal = {{Adhäsion – Kleben und Dichten}}, pages = {{39--43}}, publisher = {{Springer Vieweg}}, title = {{{Multimaterialsysteme höchstfest verbunden}}}, volume = {{3/2011}}, year = {{2011}}, } @inproceedings{15971, author = {{Frantz, Meike and Stübbe, O. and Lauter, Christian and Schrange, J. and Tröster, Thomas}}, location = {{Köln}}, title = {{{Mechatronisches System zur Bestimmung der Restlebensdauer von Faserverbund-Leichtbaustrukturen am Beispiel einer Lauffeder}}}, year = {{2011}}, } @inproceedings{15972, author = {{Thomas, D. and Block, H. and Tröster, Thomas and Krogmeier, J.}}, location = {{Köln}}, title = {{{Herstellung von belastungsgerechten Strukturbauteilen mittels partieller induktiver Härtung}}}, year = {{2011}}, } @article{15974, author = {{Marten, Thorsten and Lauter, Christian and Tröster, Thomas}}, journal = {{Ingenieurspiegel}}, pages = {{67--69}}, publisher = {{Public Verlagsgesellschaft und Anzeigenagentur}}, title = {{{Automobilleichtbau durch höchstfeste Multimaterialsysteme}}}, volume = {{2/2011}}, year = {{2011}}, } @article{15975, author = {{Lauter, Christian and Thomas, D. and Frantz, Meike and Niewel, J. and Tröster, Thomas}}, journal = {{Werkstoffe in der Fertigung – Die Fachzeitschrift für technische Führungskräfte}}, pages = {{6--7}}, publisher = {{HW-Verlag}}, title = {{{Belastungsangepasste Strukturbauteile für Automobile aus höchstfesten Werkstoffen und Hybridwerkstoffen}}}, volume = {{2}}, year = {{2011}}, } @article{15980, author = {{Lauter, Christian and Frantz, Meike and Siewers, Bernd and Tröster, Thomas}}, journal = {{JEC Composites Magazine}}, pages = {{35--37}}, publisher = {{JEC Composites}}, title = {{{Hybrid structures for tailored structural automotive components}}}, volume = {{69}}, year = {{2011}}, } @inproceedings{15990, author = {{Thomas, D. and Block, H. and Tröster, Thomas}}, location = {{Salzburg}}, title = {{{Production of load-adapted lightweight designs by partial hardening}}}, year = {{2011}}, } @article{15992, author = {{Gorny, B. and Niendorf, T. and Lackmann, J. and Thoene, M. and Tröster, Thomas and Maier, H.J.}}, issn = {{0921-5093}}, journal = {{Materials Science and Engineering: A}}, number = {{27}}, pages = {{7962--7967}}, title = {{{In situ characterization of the deformation and failure behavior of non-stochastic porous structures processed by selective laser melting}}}, doi = {{10.1016/j.msea.2011.07.026}}, volume = {{528}}, year = {{2011}}, } @article{15993, author = {{Lauter, Christian and Frantz, Meike and Tröster, Thomas}}, journal = {{Lightweight Design}}, pages = {{48--54}}, title = {{{Großserientaugliche Herstellung höchstfester Hybridwerkstoffe durch Prepregpressen}}}, volume = {{4}}, year = {{2011}}, } @inproceedings{15996, author = {{Frantz, Meike and Lauter, Christian and Tröster, Thomas}}, location = {{Ilmenau}}, title = {{{Advanced manufacturing technologies for automotive structures in multi-material design consisting of high-strength steels and CFRP}}}, year = {{2011}}, } @article{15997, author = {{Lauter, Christian and Frantz, Meike and Marten, Thorsten and Tröster, Thomas and Bach, G. and Seliger, G.}}, journal = {{Konstruktion: Zeitschrift für Produktentwicklung und Ingenieur-Werkstoffe}}, number = {{09/2011}}, publisher = {{Springer-VDI-Verlag}}, title = {{{Höchstfeste Hybridwerkstoffe aus Stahl und Faserverbundkunststoffen}}}, year = {{2011}}, } @article{15998, author = {{Frantz, Meike and Lauter, Christian and Tröster, Thomas}}, journal = {{Konstruktion: Zeitschrift für Produktentwicklung und Ingenieur-Werkstoffe}}, number = {{10/2011}}, publisher = {{Springer-VDI-Verlag}}, title = {{{Schadensdetektion in hybriden Metall-Faserverbundkunststoff-Konstruktionen}}}, year = {{2011}}, } @inproceedings{15999, author = {{Marten, Thorsten and Tröster, Thomas and Adelbert, S. and Kadim, A.}}, location = {{Kassel}}, title = {{{Fluidized bed heating of blanks for the hot forming process}}}, year = {{2011}}, } @inproceedings{16002, author = {{Tröster, Thomas and Lauter, Christian}}, location = {{Landshut}}, title = {{{Hybridstrukturen für den automobilen Leichtbau}}}, year = {{2011}}, } @article{16013, author = {{Lauter, Christian and Frantz, Meike and Tröster, Thomas}}, issn = {{1865-4819}}, journal = {{Lightweight Design}}, pages = {{48--54}}, title = {{{Großserientaugliche Herstellung von Hybridwerkstoffen durch Prepregpressen}}}, doi = {{10.1365/s35725-011-0044-5}}, volume = {{4}}, year = {{2011}}, } @article{16110, author = {{Jotzu, Gregor and Bartley, Tim and Coldenstrodt-Ronge, Hendrik B. and Smith, Brian J. and Walmsley, Ian A.}}, issn = {{0950-0340}}, journal = {{Journal of Modern Optics}}, pages = {{42--45}}, title = {{{Continuous phase stabilization and active interferometer control using two modes}}}, doi = {{10.1080/09500340.2011.621033}}, year = {{2011}}, } @article{16119, author = {{Hirsch, O. and Bösner, S. and Hüllermeier, Eyke and Senge, R. and Dembczynski, K. and Donner-Banzhoff, N.}}, journal = {{BMC Medical Research Methodology}}, number = {{155}}, title = {{{Multivariate modeling to identify patterns in clinical data: The example of chest pain}}}, volume = {{11}}, year = {{2011}}, } @article{16126, author = {{Domshlak, C. and Hüllermeier, Eyke and Kaci, S. and Prade, H.}}, journal = {{Artificial Intelligence}}, number = {{7-8}}, pages = {{1037--1052}}, title = {{{Preferences in AL: An overview}}}, volume = {{175}}, year = {{2011}}, } @article{16147, author = {{Hüllermeier, Eyke}}, journal = {{WIREs Data Mining and Knowledge Discovery}}, number = {{4}}, pages = {{269--283}}, title = {{{Fuzzy machine learning and data mining}}}, volume = {{1}}, year = {{2011}}, } @article{16148, author = {{Mernberger, M. and Klebe, G. and Hüllermeier, Eyke}}, journal = {{IEEE/ACM Transactions of Computational Biology and Bioinformatics}}, number = {{5}}, pages = {{1330--1343}}, title = {{{SEGA: Semi-global graph alignment for structure-based protein comparison}}}, volume = {{8}}, year = {{2011}}, } @article{16149, author = {{Fober, T. and Glinca, S. and Klebe, G. and Hüllermeier, Eyke}}, journal = {{IEEE/ACM Transactions on Computational Biology and Bioinformatics}}, number = {{6}}, pages = {{1653--1666}}, title = {{{Superposition and alignment of labeled point clouds}}}, volume = {{8}}, year = {{2011}}, } @article{1615, author = {{Warneke, Daniel and Dannewitz, Christian}}, issn = {{1798-2340}}, journal = {{Journal of Advances in Information Technology}}, number = {{1}}, publisher = {{Engineering and Technology Publishing}}, title = {{{Load Balancing in P2P Networks: Using Statistics to Fight Data and Execution Skew}}}, doi = {{10.4304/jait.2.1.40-49}}, volume = {{2}}, year = {{2011}}, } @article{16150, author = {{Hüllermeier, Eyke}}, journal = {{Applied Soft Computing Journal}}, pages = {{1493--1505}}, title = {{{Fuzzy sets in machine learning and data mining}}}, year = {{2011}}, } @article{16153, author = {{Senge, Robin and Hüllermeier, Eyke}}, journal = {{IEEE Transactions on Fuzzy Systems}}, number = {{2}}, pages = {{241--252}}, title = {{{Top-down induction of fuzzy pattern trees}}}, volume = {{19}}, year = {{2011}}, } @article{16239, author = {{Hankeln, Frederik and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{379--380}}, title = {{{Simulation of Deep Drawing of Carbon Fibre Prepregs}}}, doi = {{10.1002/pamm.201110181}}, year = {{2011}}, } @book{1624, author = {{Krimphove, Dieter}}, pages = {{159}}, publisher = {{Kohlhammer}}, title = {{{Werberecht (Gesetze, Urteile, Fälle und Lösungen, Sprachfassung auf interaktiver CD)}}}, year = {{2011}}, } @inbook{16409, abstract = {{Given a set of n mobile robots in the d-dimensional Euclidean space, the goal is to let them converge to a single not predefined point. The challenge is that the robots are limited in their capabilities. Robots can, upon activation, compute the positions of all other robots using an individual affine coordinate system. The robots are indistinguishable, oblivious and may have different affine coordinate systems. A very general discrete time model assumes that robots are activated in arbitrary order. Further, the computation of a new target point may happen much earlier than the movement, so that the movement is based on outdated information about other robot's positions. Time is measured as the number of rounds, where a round ends as soon as each robot has moved at least once. In [Cohen, Peleg: Convergence properties of gravitational algorithms in asynchronous robot systems], the Center of Gravity is considered as target function, convergence was proven, and the number of rounds needed for halving the diameter of the convex hull of the robot's positions was shown to be O(n^2) and Omega(n). We present an easy-to-check property of target functions that guarantee convergence and yields upper time bounds. This property intuitively says that when a robot computes a new target point, this point is significantly within the current axes aligned minimal box containing all robots. This property holds, e.g., for the above-mentioned target function, and improves the above O(n^2) to an asymptotically optimal O(n) upper bound. Our technique also yields a constant time bound for a target function that requires all robots having identical coordinate axes. }}, author = {{Cord-Landwehr, Andreas and Degener, Bastian and Fischer, Matthias and Hüllmann, Martina and Kempkes, Barbara and Klaas, Alexander and Kling, Peter and Kurras, Sven and Märtens, Marcus and Meyer auf der Heide, Friedhelm and Raupach, Christoph and Swierkot, Kamil and Warner, Daniel and Weddemann, Christoph and Wonisch, Daniel}}, booktitle = {{Automata, Languages and Programming}}, isbn = {{9783642220111}}, issn = {{0302-9743}}, title = {{{A New Approach for Analyzing Convergence Algorithms for Mobile Robots}}}, doi = {{10.1007/978-3-642-22012-8_52}}, year = {{2011}}, } @inproceedings{14010, abstract = {{Die Modellierung bzw. das virtuelle Design von Ultraschallwandlern spielt gerade im Hinblick auf die Mannigfaltigkeit ihrer Einsatzgebiete und die stetig wachsenden Anforderungen der Industrie eine Schlüsselrolle bei der Entwicklung piezoelektrischer Sensor- und Aktorsysteme. Der jeweils für eine spezielle Anwendung zu erreichende Grad der Realitätsnähe der eingesetzten Modelle ist dabei essentielle Voraussetzung für die Legitimation des virtuellen Designs. Neben idealisierten Strukturen, welche der Modellbildung unweigerlich anhaften, wird die Realitätsnähe wesentlich durch die genutzten Materialmodelle und deren Parametrisierung beeinflusst. Viele Arbeiten wurden aus diesem Grund auf dem Gebiet der akustischen Materialdaten-bestimmung sowohl passiver als auch aktiver Materialien durchgeführt. Ein Ultraschallwandler besteht nun aus einer Komposition von aktiven und passiven Elementen, welche z. B. mittels Klebungen zusammengef{\"u}gt werden. Aktuelle Praxis ist die Vernachl{\"a}ssigung der Klebschichteigenschaften oder ggf. eine Korrektur der durch die Klebschichtdicke hervorgerufene Frequenzverschiebung durch eine virtuelle Vergr{\"o}{\ss}erung eines der F{\"u}geteile. Dabei werden die Koppelbedingungen zwischen den gef{\"u}gten Materialien als ideal angenommen, was in der Realit{\"a}t jedoch nicht der Fall ist. Klebungen sind weder isotrop noch homogen aufgebaut. Des Weiteren ist ihre Dicke sehr klein, was in der Computersimulation dazu f{\"u}hrt, dass sie {\"u}ber effektive Parameter und stark vereinfachte Modelle beschrieben werden.}}, author = {{Bause, Fabian}}, title = {{{Die Auswirkung verschiedener Klebungen auf das Verhalten eines piezoelektrischen Wandlers}}}, year = {{2011}}, } @inproceedings{14011, abstract = {{Ultraschallsensoren werden heute in der Industrie vielfach erfolgreich für die verschiedensten Messaufgaben eingesetzt und ständig weiterentwickelt. Wesentliche aktuelle Entwicklungen zielen auf die Erweiterung der Funktionalität (adaptierbare Abstrahlcharakteristik, scannende Sensoren …), die Erhöhung der Zuverlässigkeit, die Miniaturisierung sowie auf die Reduktion der Gerätekosten (Materialsubstitution) und Fertigungskosten (Konstruktion und Montage). }}, author = {{Henning, Bernd}}, title = {{{Von der Messaufgabe zum Sensorsystem}}}, year = {{2011}}, } @misc{14012, author = {{Bause, Fabian and Olfert, Sergei and Schröder, Andreas and Rautenberg, Jens and Henning, Bernd and Moritzer, Elmar}}, booktitle = {{Journal of Electronic Measurement and Instrument }}, title = {{{Ultrasonic Nondestructive Testing of composite materials using disturbed coincidence conditions}}}, year = {{2011}}, } @inproceedings{14013, abstract = {{Modeling and simulation play a key-role in computer-assisted design of ultrasonic sensors. The accuracy of those numerical or analytical models highly depends on the material dataset chosen as well as on the digitized simplified geometry. Thus, researchers worked on techniques how to measure material datasets of piezoceramics or passive materials (i.e. polymers) for use in simulation [Rau08] [Rup09]. Most computer models neglect the influence of adhesive bonds between those active and passive material components used to form a complete ultrasonic transducer and thus imply perfect interface layers. To gain a more accurate model one need to go further and consider non-perfect interface layers between assembly parts. Because adhesive bonds are neither necessarily isotropic nor homogeneous and their geometric dimensions are very small, we need to define effective material datasets dependent on the model used in simulation. In this contribution the indicator under study is the electric impedance of the active element. We will show the influence of different adhesives used to adhere metal electrodes on piezoceramic discs. Therefore, we use several different types of adhesives (epoxies, cyanoacrylates and perfluorpolyether grease) and different sizes of piezoceramic discs (PIC 255, manufacturer: PI Ceramic GmbH) of the same batch (thickness, diameter). The electrodes have been cut from one plate made of stainless steel using a laser to avoid uncertainty effects due to variations in material-parameters. The probes have been prepared in an air-conditioned Lab with constant temperature and humidity. The indicators considered to identify the effect of those different adhesive films are extracted from the electric impedance of the electromechanical converter.}}, author = {{Bause, Fabian and Rautenberg, Jens and Henning, Bernd}}, location = {{Chengdu, China}}, pages = {{18--23}}, title = {{{Analyzing the effect of adhered metal electrodes on piezoelectric elements using different types of adhesives}}}, volume = {{3}}, year = {{2011}}, } @article{14014, abstract = {{Nowadays ultrasonic distance sensors are widely used in automobiles, robotics and in industrial automation. Some functional principles of usable transducers for airborne ultrasonic distance measurements are shown. As every sensor principle, ultrasonic distance sensors have pros and cons which lead to some problems and challenges described below. For the main challenges (crosstalk and blind zone) some trends and solutions are presented.}}, author = {{Henning, Bernd and Schröder, Andreas}}, journal = {{Journal of Electronic Measurement and Instrument}}, number = {{7}}, pages = {{577--581}}, title = {{{Ultrasonic distance sensors - An overview and trends}}}, volume = {{25}}, year = {{2011}}, } @inproceedings{14015, abstract = {{Es gibt unterschiedliche Methoden, um räumliche Schallwechseldruckverteilungen in Flüssigkeiten zu erfassen. Viele dieser Verfahren haben zwei Nachteile. Sie sind zum einen invasiv, beeinflussen somit die sich ausbreitende Ultraschallwelle, und zum anderen sehr zeitaufwendig. Die Visualisierung von Ultraschallfeldern mittels Schlierenmethode ist eine schnelle und einfache Methode, um zweidimensionale Schallfelder nichtinvasiv zu analysieren. Ein besonderer Vorteil besteht darin, dass man unmittelbar resultierende Veränderungen im Schallfeld zum Beispiel bei Frequenzänderung, Sensorausrichtung… beobachten kann. In diesem Beitrag werden zwei dieser Verfahren vorgestellt. Die modifizierte Schlierenmethode nach Toepler, das im Weiteren als modifizierte Schlierenmethode bezeichnet wird, und die Hintergrund-schlierenmethode, das sich bisher hauptsächlich zur Strömungsvisualisierung etabliert hat [1]. Im ersten Teil werden beide Messverfahren erläutert, die realisierten Messaufbauten sowie Einsatzmöglichkeiten für die Schallfeldcharakterisierung kurz vorgestellt. Im zweiten Teil werden beide Verfahren verglichen und die Vor- und Nachteile bezüglich ausgewählter Messaufgaben bewertet. }}, author = {{Olfert, Sergei and Henning, Bernd}}, location = {{Düsseldorf}}, title = {{{Vergleich zwischen der Schlierenmethode nach Toepler und der Hintergrundschlierenmethode zur Bestimmung akustischer Grössen eines Ultraschallwandlers}}}, year = {{2011}}, } @inproceedings{14016, abstract = {{There has been a lot of progress in finding measurable quantities of high in- formation content for the inverse determination of piezoelectric material properties. Since some material parameters (mainly \textgreek{e}S 11, e15and cE 44) do not or only marginally influence the electrical impedance over frequency, it is not sufficient to look only at the electri- cal impedance of discoidal piezoceramics [1]. Moreover, the parameter sensitivities vary with respect to the diameter--thickness ratio of the disc and the design of an ultrasonic transducer's piezoceramic has to match other requirements than those of a good material characterization [2, 3]. That is why it is still desirable to find model based approaches for parameter identification that either keep the technical effort low (e.g., only an impedance measurement) or increase speed of the inversion procedure. In this contribution we answer the question if an additional analytical approximation of cE 44, strictly following the ideas of Theocaris [4], in conjunction with a single measured elec- trical impedance will be sufficient for an accurate simulation of both, electrical impedance and surface normal velocity of a piezoceramic disc. Thereby, the remaining parameters are identified by means of the Inverse Method. Furthermore, we use the parameter ap- proximation as an initial guess and limiting boundary to speed up the inverse algorithm if both, electrical impedance and surface normal velocity are taken into account within the optimization procedure.}}, author = {{Rautenberg, Jens and Rupitsch, Stefan J. and Henning, Bernd and Lerch, Reinhard}}, booktitle = {{7th International Workshop on Direct and Inverse Problems in Piezoelectricity}}, title = {{{Utilizing an Analytical Approximation for c44E to Enhance the Inverse Method for Material Parameter Identification of Piezoceramics}}}, year = {{2011}}, } @inproceedings{14548, abstract = {{Bei der Luftultraschall-Abstandsmessung mit einem einzelnen Schallwandler ist der Mindestabstand durch die Sendesignaldauer und die Ausschwingzeit des Schallwandlers begrenzt. Daher führt die Verwendung von codierten Sendesignalen, wie sie z.B. für die Unterscheidung mehrerer Sender genutzt werden können, im Allgemeinen zu einer Vergrößerung des Mindestabstandes. Dieser Beitrag zeigt, dass der Mindestabstand bei codierten Sendesignalen durch eine geeignete Signalverarbeitung, bei der eine Trennung des Sende- und Empfangssignals erfolgt, deutlich verringert werden kann.}}, author = {{Schröder, Andreas and Henning, Bernd}}, location = {{Düsseldorf}}, title = {{{Luftultraschall-Abstandsmessung mit verkürztem Mindestabstand}}}, year = {{2011}}, } @inproceedings{14549, abstract = {{Simultaneous transmitting and receiving (STaR) enhances the utilization of single transducer ultrasound measurement systems. In distance measurement applications the dead zone can be reduced to nearly zero, independent of the transmitted signal. So it is possible to transmit codedsignals to identify different sensors without increasing the minimum distance. The electrical transducer signal consists of the electrical transmitted and received signal. A separation of these two signals can be done with a mathematical model of the electrical system. For this purpose it is necessary to digitize the electrical transducer signal. Due to the relative small amplitude of the received signal compared to the transmitted signal amplitude, a high resolution analog to digital converter (ADC) is needed. This leads to high requirements for the ADC. The necessary resolution limits the sample rate of the ADC. By down mixing the transducer signal using a coherent quadrature demodulation (CQD), as used in many high frequency ultrasound applications, the sample rate of the ADC can be reduced. In this contribution an airborne ultrasound distance measurement system with reduced dead zone is used to analyze the effects of this concept to the signal conditioning, system identification and system performance. The approach is compared with a system without CQD and an ADC with a lower resolution but a higher sample rate. By analyzing the pros and cons of both systems the usability of a CQD based system for a STaR application is evaluated. The distance measurement system used for the experiments is based on a 40 kHz airborne ultrasonic transducer. A gyrator based transmit amplifier delivers a system bandwidth of about 10 kHz. In the experiments, coded transmitted signals are used to measure the distance to a metal reflector. The main objectives are short distances between 0 mm and 200 mm. Here a separation of transmitted and received signal is necessary. The reflector distance is calculated by a cross correlation between transmitted and received signal.}}, author = {{Schröder, Andreas and Henning, Bernd}}, title = {{{Model based separation of transmitted and received signal for single transducer distance measurement applications}}}, year = {{2011}}, } @inproceedings{14550, abstract = {{For many applications like level measurement and industry robotics it is of advantage if the directional characteristic of an ultrasonic transducer is changeable or adaptable for the improvement of spatial resolution. Often this goal is reached with the use of ultrasonic transducer arrays, which elements are driven with phase shifted excitation signals. One disadvantage of these solutions is the great effort for building such an array and the multi-channel sensor electronics. In this contribution the directional characteristic of a single air transducer with segmented electrodes is analyzed. Therefore a variable script based finite element model is used to discover the influence of different electrode configurations on the directional characteristic of a single piezoceramic transducer. Especially the influence on the angle of beam and the near field length are evaluated. The used variable model permits an optimization of the configuration with regards to the mentioned criteria. The findings will be used for the development of a level measurement system for bulk solids.}}, author = {{Unverzagt, Carsten and Henning, Bernd}}, keywords = {{Elektrode}}, location = {{Gdansk, Poland}}, title = {{{Finite element simulation of single ultrasonic transducer with segmented electrodes to adjust the directional characteristic}}}, year = {{2011}}, } @inproceedings{13053, author = {{Cook, Alejandro and Hellebrand, Sybille and Indlekofer, Thomas and Wunderlich, Hans-Joachim}}, booktitle = {{5. GMM/GI/ITG Fachtagung "Zuverlässigkeit und Entwurf"}}, pages = {{48--53}}, title = {{{Robuster Selbsttest mit Diagnose}}}, year = {{2011}}, } @inproceedings{13194, author = {{Dembczynski, K. and Waegeman, W. and Cheng, W. and Hüllermeier, Eyke}}, booktitle = {{In Proceedings NIPS-2011, 25th Annual Conference on Neural Information Processing Systems, Granada, Spain}}, title = {{{An exact algorithm for F-measure maximization}}}, year = {{2011}}, }