TY - CONF AU - Bätz, Alexander AU - Böttcher, Stefan AU - Hartel, Rita ID - 15099 SN - 0302-9743 T2 - Advances in Databases - 28th British National Conference on Databases, BNCOD 28, Revised Selected Papers TI - Updates on Grammar-Compressed XML Data ER - TY - CONF AU - Böttcher, Stefan AU - Hartel, Rita AU - Stey, Sebastian ID - 15100 SN - 0302-9743 T2 - Advances in Databases - 28th British National Conference on Databases, BNCOD 28, Revised Selected Papers TI - TraCX: Transformation of Compressed XML ER - TY - CONF AU - Böttcher, Stefan AU - Bültmann, Alexander AU - Hartel, Rita ID - 15102 SN - 9781612842790 T2 - 2011 Data Compression Conference TI - Search and Modification in Compressed Texts ER - TY - CONF AU - Böttcher, Stefan AU - Fernhomberg, Lars AU - Hartel, Rita ID - 15103 T2 - WEBIST 2011, Proceedings of the 7th International Conference on Web Information Systems and Technologies TI - Enhancing XML-cache Efficiency by XML Compression ER - TY - CONF AU - Böttcher, Stefan AU - Fernhomberg, Lars AU - Hartel, Rita ID - 15104 SN - 1865-1348 T2 - Web Information Systems and Technologies - 7th International Conference, WEBIST 2011, Revised Selected Papers TI - Reducing Data Transfer by Combining XML-Compression and XML-Caching ER - TY - CONF AU - Nasiri, M. AU - Hüllermeier, Eyke AU - Senge, Robin AU - Lughofer, E. ID - 15115 T2 - in Proceedings IFSA-2011 World Congress of the International Fuzzy Systems Association, Surabaya and Bali Island, Indonesia TI - Comparing methods for knowledge-driven and data-driven fuzzy modeling: A case study in textile industry ER - TY - CONF AU - Lughofer, E. AU - Hüllermeier, Eyke ED - Galichet, S. ED - Montero, J. ED - Mauris, G. ID - 15116 T2 - in Proceedings EUSFLAT-2011 7th International Conference on the European Society for Fuzzy Logic and Technology, Aix-les-Bains, France TI - On-line redundancy deletion in evolving fuzzy regression models using a fuzzy inclusion measure ER - TY - CONF AU - Fallah Tehrani, A. AU - Cheng, W. AU - Hüllermeier, Eyke ID - 15117 T2 - in Proceedings EUSFLAT-2011 7th International Conference on the European Society for Fuzzy Logic and Technology, Aix-les-Bains, France TI - Choquistic regression: Generalizing logistic regression using the Choquet integral ER - TY - CHAP AU - Domik, Gitta AU - Fischer, Gerhard ID - 15127 SN - 978-3-642-19390-3 T2 - Rainbow of computer science TI - Transdisciplinary collaboration and lifelong learning: fostering and supporting new learning opportunities ER - TY - GEN AU - Böttcher, Stefan AU - Hartel, Rita AU - Hawicks, Heike ID - 15181 T2 - XXIV ICOS Internationales Kongress für Namensforschung TI - Namenlemmatisierung in der Web-Datenbank mittelalterlicher und frühneuzeitlicher Universitätsmatrikel ER - TY - CONF AU - Domik, Gitta AU - Arens, Stephan AU - Scharlau, Ingrid AU - Hilkenmeier, Frederic ID - 15193 IS - 324 SN - 978-88579-286-4 T2 - INFORMATIK 2011 – Informatik schafft Communities TI - How useful is computer graphics for medical diagnoses? ER - TY - JOUR AU - Lauter, Christian AU - Sarrazin, M. AU - Tröster, Thomas ID - 15969 JF - Adhäsion – Kleben und Dichten TI - Multimaterialsysteme höchstfest verbunden VL - 3/2011 ER - TY - CONF AU - Frantz, Meike AU - Stübbe, O. AU - Lauter, Christian AU - Schrange, J. AU - Tröster, Thomas ID - 15971 TI - Mechatronisches System zur Bestimmung der Restlebensdauer von Faserverbund-Leichtbaustrukturen am Beispiel einer Lauffeder ER - TY - CONF AU - Thomas, D. AU - Block, H. AU - Tröster, Thomas AU - Krogmeier, J. ID - 15972 TI - Herstellung von belastungsgerechten Strukturbauteilen mittels partieller induktiver Härtung ER - TY - JOUR AU - Marten, Thorsten AU - Lauter, Christian AU - Tröster, Thomas ID - 15974 JF - Ingenieurspiegel TI - Automobilleichtbau durch höchstfeste Multimaterialsysteme VL - 2/2011 ER - TY - JOUR AU - Lauter, Christian AU - Thomas, D. AU - Frantz, Meike AU - Niewel, J. AU - Tröster, Thomas ID - 15975 JF - Werkstoffe in der Fertigung – Die Fachzeitschrift für technische Führungskräfte TI - Belastungsangepasste Strukturbauteile für Automobile aus höchstfesten Werkstoffen und Hybridwerkstoffen VL - 2 ER - TY - JOUR AU - Lauter, Christian AU - Frantz, Meike AU - Siewers, Bernd AU - Tröster, Thomas ID - 15980 JF - JEC Composites Magazine TI - Hybrid structures for tailored structural automotive components VL - 69 ER - TY - CONF AU - Thomas, D. AU - Block, H. AU - Tröster, Thomas ID - 15990 TI - Production of load-adapted lightweight designs by partial hardening ER - TY - JOUR AU - Gorny, B. AU - Niendorf, T. AU - Lackmann, J. AU - Thoene, M. AU - Tröster, Thomas AU - Maier, H.J. ID - 15992 IS - 27 JF - Materials Science and Engineering: A SN - 0921-5093 TI - In situ characterization of the deformation and failure behavior of non-stochastic porous structures processed by selective laser melting VL - 528 ER - TY - JOUR AU - Lauter, Christian AU - Frantz, Meike AU - Tröster, Thomas ID - 15993 JF - Lightweight Design TI - Großserientaugliche Herstellung höchstfester Hybridwerkstoffe durch Prepregpressen VL - 4 ER - TY - CONF AU - Frantz, Meike AU - Lauter, Christian AU - Tröster, Thomas ID - 15996 TI - Advanced manufacturing technologies for automotive structures in multi-material design consisting of high-strength steels and CFRP ER - TY - JOUR AU - Lauter, Christian AU - Frantz, Meike AU - Marten, Thorsten AU - Tröster, Thomas AU - Bach, G. AU - Seliger, G. ID - 15997 IS - 09/2011 JF - Konstruktion: Zeitschrift für Produktentwicklung und Ingenieur-Werkstoffe TI - Höchstfeste Hybridwerkstoffe aus Stahl und Faserverbundkunststoffen ER - TY - JOUR AU - Frantz, Meike AU - Lauter, Christian AU - Tröster, Thomas ID - 15998 IS - 10/2011 JF - Konstruktion: Zeitschrift für Produktentwicklung und Ingenieur-Werkstoffe TI - Schadensdetektion in hybriden Metall-Faserverbundkunststoff-Konstruktionen ER - TY - CONF AU - Marten, Thorsten AU - Tröster, Thomas AU - Adelbert, S. AU - Kadim, A. ID - 15999 TI - Fluidized bed heating of blanks for the hot forming process ER - TY - CONF AU - Tröster, Thomas AU - Lauter, Christian ID - 16002 TI - Hybridstrukturen für den automobilen Leichtbau ER - TY - JOUR AU - Lauter, Christian AU - Frantz, Meike AU - Tröster, Thomas ID - 16013 JF - Lightweight Design SN - 1865-4819 TI - Großserientaugliche Herstellung von Hybridwerkstoffen durch Prepregpressen VL - 4 ER - TY - JOUR AU - Jotzu, Gregor AU - Bartley, Tim AU - Coldenstrodt-Ronge, Hendrik B. AU - Smith, Brian J. AU - Walmsley, Ian A. ID - 16110 JF - Journal of Modern Optics SN - 0950-0340 TI - Continuous phase stabilization and active interferometer control using two modes ER - TY - JOUR AU - Hirsch, O. AU - Bösner, S. AU - Hüllermeier, Eyke AU - Senge, R. AU - Dembczynski, K. AU - Donner-Banzhoff, N. ID - 16119 IS - 155 JF - BMC Medical Research Methodology TI - Multivariate modeling to identify patterns in clinical data: The example of chest pain VL - 11 ER - TY - JOUR AU - Domshlak, C. AU - Hüllermeier, Eyke AU - Kaci, S. AU - Prade, H. ID - 16126 IS - 7-8 JF - Artificial Intelligence TI - Preferences in AL: An overview VL - 175 ER - TY - JOUR AU - Hüllermeier, Eyke ID - 16147 IS - 4 JF - WIREs Data Mining and Knowledge Discovery TI - Fuzzy machine learning and data mining VL - 1 ER - TY - JOUR AU - Mernberger, M. AU - Klebe, G. AU - Hüllermeier, Eyke ID - 16148 IS - 5 JF - IEEE/ACM Transactions of Computational Biology and Bioinformatics TI - SEGA: Semi-global graph alignment for structure-based protein comparison VL - 8 ER - TY - JOUR AU - Fober, T. AU - Glinca, S. AU - Klebe, G. AU - Hüllermeier, Eyke ID - 16149 IS - 6 JF - IEEE/ACM Transactions on Computational Biology and Bioinformatics TI - Superposition and alignment of labeled point clouds VL - 8 ER - TY - JOUR AU - Warneke, Daniel AU - Dannewitz, Christian ID - 1615 IS - 1 JF - Journal of Advances in Information Technology SN - 1798-2340 TI - Load Balancing in P2P Networks: Using Statistics to Fight Data and Execution Skew VL - 2 ER - TY - JOUR AU - Hüllermeier, Eyke ID - 16150 JF - Applied Soft Computing Journal TI - Fuzzy sets in machine learning and data mining ER - TY - JOUR AU - Senge, Robin AU - Hüllermeier, Eyke ID - 16153 IS - 2 JF - IEEE Transactions on Fuzzy Systems TI - Top-down induction of fuzzy pattern trees VL - 19 ER - TY - JOUR AU - Hankeln, Frederik AU - Mahnken, Rolf ID - 16239 JF - PAMM SN - 1617-7061 TI - Simulation of Deep Drawing of Carbon Fibre Prepregs ER - TY - BOOK AU - Krimphove, Dieter ID - 1624 TI - Werberecht (Gesetze, Urteile, Fälle und Lösungen, Sprachfassung auf interaktiver CD) ER - TY - CHAP AB - 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. AU - Cord-Landwehr, Andreas AU - Degener, Bastian AU - Fischer, Matthias AU - Hüllmann, Martina AU - Kempkes, Barbara AU - Klaas, Alexander AU - Kling, Peter AU - Kurras, Sven AU - Märtens, Marcus AU - Meyer auf der Heide, Friedhelm AU - Raupach, Christoph AU - Swierkot, Kamil AU - Warner, Daniel AU - Weddemann, Christoph AU - Wonisch, Daniel ID - 16409 SN - 0302-9743 T2 - Automata, Languages and Programming TI - A New Approach for Analyzing Convergence Algorithms for Mobile Robots ER - TY - CONF AB - 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. AU - Bause, Fabian ID - 14010 TI - Die Auswirkung verschiedener Klebungen auf das Verhalten eines piezoelektrischen Wandlers ER - TY - CONF AB - 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). AU - Henning, Bernd ID - 14011 TI - Von der Messaufgabe zum Sensorsystem ER - TY - GEN AU - Bause, Fabian AU - Olfert, Sergei AU - Schröder, Andreas AU - Rautenberg, Jens AU - Henning, Bernd AU - Moritzer, Elmar ID - 14012 T2 - Journal of Electronic Measurement and Instrument TI - Ultrasonic Nondestructive Testing of composite materials using disturbed coincidence conditions ER - TY - CONF AB - 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. AU - Bause, Fabian AU - Rautenberg, Jens AU - Henning, Bernd ID - 14013 TI - Analyzing the effect of adhered metal electrodes on piezoelectric elements using different types of adhesives VL - 3 ER - TY - JOUR AB - 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. AU - Henning, Bernd AU - Schröder, Andreas ID - 14014 IS - 7 JF - Journal of Electronic Measurement and Instrument TI - Ultrasonic distance sensors - An overview and trends VL - 25 ER - TY - CONF AB - 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. AU - Olfert, Sergei AU - Henning, Bernd ID - 14015 TI - Vergleich zwischen der Schlierenmethode nach Toepler und der Hintergrundschlierenmethode zur Bestimmung akustischer Grössen eines Ultraschallwandlers ER - TY - CONF AB - 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. AU - Rautenberg, Jens AU - Rupitsch, Stefan J. AU - Henning, Bernd AU - Lerch, Reinhard ID - 14016 T2 - 7th International Workshop on Direct and Inverse Problems in Piezoelectricity TI - Utilizing an Analytical Approximation for c44E to Enhance the Inverse Method for Material Parameter Identification of Piezoceramics ER - TY - CONF AB - 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. AU - Schröder, Andreas AU - Henning, Bernd ID - 14548 TI - Luftultraschall-Abstandsmessung mit verkürztem Mindestabstand ER - TY - CONF AB - 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. AU - Schröder, Andreas AU - Henning, Bernd ID - 14549 TI - Model based separation of transmitted and received signal for single transducer distance measurement applications ER - TY - CONF AB - 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. AU - Unverzagt, Carsten AU - Henning, Bernd ID - 14550 KW - Elektrode TI - Finite element simulation of single ultrasonic transducer with segmented electrodes to adjust the directional characteristic ER - TY - CONF AU - Cook, Alejandro AU - Hellebrand, Sybille AU - Indlekofer, Thomas AU - Wunderlich, Hans-Joachim ID - 13053 T2 - 5. GMM/GI/ITG Fachtagung "Zuverlässigkeit und Entwurf" TI - Robuster Selbsttest mit Diagnose ER - TY - CONF AU - Dembczynski, K. AU - Waegeman, W. AU - Cheng, W. AU - Hüllermeier, Eyke ID - 13194 T2 - In Proceedings NIPS-2011, 25th Annual Conference on Neural Information Processing Systems, Granada, Spain TI - An exact algorithm for F-measure maximization ER -