@inproceedings{8440, author = {{Sancar, Yavuz and Brüseke, Frank and Voigt, Hendrik and Sauer, Stefan and Engels, Gregor}}, booktitle = {{ECOOP 2010 - Workshop on Testing Object-Oriented Software Systems (ETOOS)}}, pages = {{59--67}}, title = {{{Towards Economical Software Release Recommendations}}}, year = {{2010}}, } @inproceedings{8441, author = {{Gerth, Christian}}, booktitle = {{Proceedings of the Joint Workshop of the German Research Training Groups in Computer Science}}, pages = {{183--184}}, title = {{{A Framework for Change Management of Business Process Models}}}, year = {{2010}}, } @inproceedings{8442, author = {{Luckey, Markus and Baumann, Andrea and Méndez Fernández, Daniel and Wagner, Stefan}}, booktitle = {{Software Engineering for Secure Systems, 2010. SESS '10. ICSE Workshop}}, title = {{{Reusing Security Requirements using an Extended Quality Model}}}, year = {{2010}}, } @inproceedings{8443, author = {{Sancar, Yavuz and Brüseke, Frank and Engels, Gregor}}, booktitle = {{Proceedings of Software-Qualitätsmodellierung und -bewertung (SQMB '10), Paderborn, Germany}}, pages = {{50--57}}, publisher = {{Technische Universität München}}, title = {{{Teststufenspezifische Qualitätsattribute für die Qualitätsbewertung von nichtfunktionalen Anforderungen}}}, year = {{2010}}, } @inproceedings{8444, abstract = {{To be successful with global software development (GSD), development knowledge needs to be shared among the developers and stakeholders, and the quality of the exchanged information must be assured. Therefore, mature processes, methods and tools have to be in place. If a unified and integrated solution does not exist, this impedes the exchange of knowledge (and the migration of people between projects). In GSD, such a diversity can lead to new problems: offshore development teams have to repeatedly re-adjust to method variants used by the respective business units. This can lead to misinterpretation of information and risks for project success. We report on re-aligning the varying software engineering methods and unifying the methodology throughout Capgemini sd&m. We also standardized quality assurance procedures and tightly integrated them with the engineering methodology. By this, we arrived at a comprehensive company-wide Enterprise Software Engineering Model that effectively supports knowledge transfer from clients to the onshore and offshore team.}}, author = {{Salger, Frank and Sauer, Stefan and Engels, Gregor and Baumann, Andrea}}, booktitle = {{5th IEEE International Conference on Global Software Engineering (ICGSE 2010)}}, pages = {{336--341}}, title = {{{Knowledge Transfer in Global Software Development - Leveraging Ontologies, Tools and Assessments}}}, doi = {{http://doi.ieeecomputersociety.org/10.1109/ICGSE.2010.46}}, year = {{2010}}, } @inproceedings{8445, author = {{Van den Bergh, Jan and Meixner, Gerrit and Sauer, Stefan}}, booktitle = {{Proc. 5th Intl. Workshop on Model Driven Development of Advanced User Interfaces (MDDAUI 2010)}}, pages = {{53--56}}, title = {{{MDDAUI 2010 Workshop Report}}}, volume = {{617}}, year = {{2010}}, } @inproceedings{8446, author = {{Güldali, Baris and Sauer, Stefan and Winkelhane, Peter and Jahnich, Michael and Funke, Holger}}, booktitle = {{Proceedings of 5th International Workshop on Automation of Software Test (AST 2010), ICSE Workshop}}, pages = {{119--126}}, publisher = {{ACM Press}}, title = {{{Pattern-based Generation of Test Plans for Open Distributed Processing Systems}}}, year = {{2010}}, } @inproceedings{8447, author = {{Brüseke, Frank and Sancar, Yavuz and Engels, Gregor}}, booktitle = {{Proceedings of Software-Qualitätsmodellierung und -bewertung (SQMB '10), Paderborn, Germany}}, pages = {{22--31}}, publisher = {{Technische Universität München}}, title = {{{Architecture-Driven Derivation of Performance Metrics}}}, year = {{2010}}, } @inproceedings{8448, author = {{Güldali, Baris and Mlynarski, Michael and Sancar, Yavuz}}, booktitle = {{Proceedings of 3th International Conference on Software Testing, Verification, and Validation Workshops}}, pages = {{28--36}}, publisher = {{IEEE Computer Society}}, title = {{{Effort Comparison of Model-based Testing Scenarios}}}, year = {{2010}}, } @inproceedings{8449, author = {{Schnelte, Matthias and Güldali, Baris}}, booktitle = {{INFORMATIK 2010, Beiträge der 40. Jahrestagung der Gesellschaft für Informatik e.V. (GI)}}, pages = {{(accepted for publication)}}, publisher = {{Gesellschaft für Informatik (GI)}}, title = {{{Test Case Generation for Visual Contracts Using AI Planning}}}, year = {{2010}}, } @article{9743, abstract = {{The hydrothermal method enables the production of high-quality piezoelectric materials. In this study, we propose to irradiate the reaction solutions with ultrasonic power during the hydrothermal method to obtain a shorter reaction time and a smooth film surface. A high-pressure reaction container for the ultrasonic transducer was newly developed, and the ultrasonically-assisted hydrothermal method was examined by using this container. The effect of ultrasonic assist on the synthesis of lead-zirconate-titanate (PZT) thin films and (K,Na)NbO$_{3}$ powders was verified. Thicker PZT film, thickness around 10 ${\mu}$m, could be obtained in one process, and (K,Na)NbO$_{3}$ powder was synthesized in half the previous reaction time.}}, author = {{Ageba, Ryo and Kadota, Yoichi and Maeda, Takafumi and Takiguchi, Norihito and Morita, Takeshi and Ishikawa, Mutsuo and Bornmann, Peter and Hemsel, Tobias}}, issn = {{1948-5719}}, journal = {{Journal of Korean Physical Society}}, keywords = {{Hydrothermal method, High-power ultrasonic, PZT thin film, Lead-free piezoelectric materials}}, number = {{4}}, pages = {{918--923}}, title = {{{Ultrasonically-assisted Hydrothermal Method for Ferroelectric Material Synthesis}}}, doi = {{10.3938/jkps.57.918}}, volume = {{57}}, year = {{2010}}, } @article{9744, abstract = {{Direct ultrasound irradiation is advantageous to increase the efficiency of the hydrothermal method which can be used for the production of piezoelectric thin films and lead free piezoelectric ceramics. To apply ultrasound directly to the process transducer prototypes were developed regarding the boundary conditions of the hydrothermal method. LiNbO$_{3}$ and PIC 181 were proven as feasible materials for high temperature resistant transducers ($\geq 200^\circ C$). Resistance of the transducers horn against the corrosive mineralizer was achieved by using Hastelloy C-22. The efficiency of the ultrasound assisted hydrothermal method depends on the generated sound field. Impedance and sound field measurements have shown that the sound field depends on the filling level and the position and design of the transducer.}}, author = {{Bornmann, Peter and Hemsel, Tobias and Littmann, Walter and Ageba, Ryo and Kadota, Yoishi and Morita, Takeshi}}, issn = {{1948-5719}}, journal = {{Journal of Korean Physical Society}}, keywords = {{High-temperature transducer, Hydrothermal method, Lithium-niobate transducer}}, number = {{4}}, pages = {{1122}}, title = {{{Ultrasonic Transducer for the Hydrothermal Method}}}, doi = {{10.3938/jkps.57.1122}}, volume = {{57}}, year = {{2010}}, } @article{9745, abstract = {{In the modeling of piezoelectric Langevin transducers using usual transfer matrix methods, some simplifications have been adopted. This leads to reduction of the model quality. A mixed transfer matrix method is employed in the modeling of Langevin transducers, where the pre-stressed bolt is modeled as a separate four-pole element, which is connected to other elements in parallel. Based on the mixed transfer matrix method, the four (six)-pole element description of the piezoelectric Langevin transducer is built up and the total transfer matrix relation is derived. The resonance frequencies of the transducer are calculated and then measured using the impedance analyzer (HP4192). Experimental result shows that the mixed transfer matrix method has better modeling quality than the usual transfer matrix method for the vibration analysis of piezoelectric Langevin transducers.}}, author = {{Fu, Bo and Li, Chao and Zhang, Jianming and Huang, Zhenwei and Hemsel, Tobias}}, issn = {{1948-5719}}, journal = {{Journal of Korean Physical Society}}, keywords = {{Piezoelectric langevin transducer, Transfer matrix method, Four (six)-pole element description, Pre-stressed bolt}}, number = {{4}}, pages = {{929}}, title = {{{Modeling of Piezoelectric Langevin Transducers by Using Mixed Transfer Matrix Methods}}}, doi = {{10.3938/jkps.57.929}}, volume = {{57}}, year = {{2010}}, } @article{9747, abstract = {{Bei der Konstruktion von Maschinen ist es oftmals erforderlich, Schwingungen minimal zu halten. Um z.B. die Lebensdauer zu erhöhen, Material einzusparen oder den Geräuschpegel gering zu halten muss oft ein großer Aufwand zur Dämpfung von auftretenden Schwingungen betrieben werden. In vielen technischen Anwendungen werden Einzelteile miteinander verschraubt. Diese Fügestellen können gezielt und mit wenig Aufwand zur Schwingungsdämpfung herangezogen werden. Die Berechnung des dynamischen Verhaltens verschraubter Strukturen stellt immer noch eine Herausforderung dar. Es wurde eine Methode entwickelt, um den eingeschwungenen Zustand elastischer, miteinander verschraubter Körper mit rauen Fügestellen bei periodischer Anregung zu berechnen. Als Basis dienen Finite Elemente Modelle der einzelnen Teile, deren Freiheitsgrade durch modale Kondensation reduziert werden. Unter Anwendung des Verfahrens von Ritz und Galerkin wird eine Näherungslösung für den eingeschwungenen Zustand des nichtlinearen, gekoppelten Systems ermittelt. Abhängig von den Schraubenvorspannkräften sowie den bestimmenden Parametern der Kontaktflächen, Rautiefe und Reibungskoeffizient, kann die Systemantwort berechnet und optimiert werden. Um die Berechnungsmethode zu verifizieren wurden Experimente durchgeführt. Der Vergleich zwischen Messung und Rechnung zeigt eine gute Übereinstimmung. ({\copyright} 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)}}, author = {{Hölzl, Johannes Sebastian and Sextro, Walter}}, issn = {{1617-7061}}, journal = {{PAMM}}, number = {{1}}, pages = {{247--248}}, publisher = {{WILEY-VCH Verlag}}, title = {{{Reibungsdämpfung in ausgedehnten, verschraubten Fügestellen}}}, doi = {{10.1002/pamm.201010116}}, volume = {{10}}, year = {{2010}}, } @article{9748, abstract = {{For many technical applications it is necessary to avoid or to reduce vibrations. Factors benefiting from vibration reduction are for example the durability of the application, which is increased, as well as cost expenses and the level of noise, which are both decreased. Rough, bolted interfaces are common in most machines and can be used as damping devices with some effort. Perhaps in future such contact surfaces could be used as damping devices at the interfaces of an automotive engine or exhaust system. Nevertheless it is difficult to predict the effect of a change in contact interface parameters on the dynamic behavior of the entire mechanical system. Therefore a method for calculating the steady state behavior of elastic multi-body systems was developed. The basis of this method is a finite element model of each contacting unit. On each model a modal reduction is applied in order to reduce the degrees of freedom. The method of Ritz and Galerkin is used to calculate the frequency response functions of the reduced system including contact. This method allows the calculation of the steady-state behavior of elastic multi-body systems with rough, bolted contact interfaces, by taking the pre-stress of the bolts, the roughness and the friction coefficient of the contacting surfaces as parameters. In order to verify calculated results, a test stand was built. The comparison of calculated and experimental results showed a satisfying correlation.}}, author = {{ Hölzl, Johannes Sebastian and Sextro, Walter}}, journal = {{SAE International Journal of Passenger Cars- Mechanical Systems}}, keywords = {{Automotive}}, pages = {{929--935}}, title = {{{Simulation of the Dynamical Behavior of Elastic Multi-Body Systems with Bolted, Rough Contact Interfaces}}}, doi = {{10.4271/2010-01-1422}}, year = {{2010}}, } @article{9749, abstract = {{Piezoelectric materials find wide application in technical systems. Most often, a combination of piezoelectric and other materials is advantageous. The position and the amount of the piezoelectric material within the overall system depends on various aspects like maximum mechanical output to the load, maximum electromechanical efficiency of the system, maximum utilization of the piezoelectric material, minimum self-heating of the piezoelectric material, and controllability of the system, which might be key aspects for the optimisation of the system design. For a composite longitudinal vibrator (bolted Langevin transducer), which is a base for many technical applications, this contribution shows in detail, how above mentioned aspects depend on the position and volume of the piezoelectric material related to the mode shape.}}, author = {{Hemsel, Tobias and Lierk, Ernst Günther and Littmann, Walter and Morita, Takeshi}}, issn = {{1948-5719}}, journal = {{Journal of Korean Physical Society}}, keywords = {{Bolted Langevin transducer, Optimum placement of piezoelectric ceramics}}, number = {{4}}, pages = {{933--937}}, title = {{{Various Aspects of the Placement of a Piezoelectric Material in Composite Actuators, Motors, and Transducers}}}, doi = {{10.3938/jkps.57.933}}, volume = {{57}}, year = {{2010}}, } @article{9750, author = {{Hess, D. and Hüfner, Thorsten and Hesse, Tobias and Sondermann-Wölke, Christoph and Sattel, Thomas}}, journal = {{Internationales Mechatronik-Kolloquium "Mechatronik 2010"}}, title = {{{Intelligente mechatronische Systeme zur automatisierten Fahrzeugführung in Fahrerassistenzsystemen}}}, year = {{2010}}, } @article{9751, abstract = {{Piezoelectric inertia motors have a simple construction and are controlled by a single driving signal. This allows for miniaturization and low cost production. One of the main questions to be answered during the design process of a piezoelectric inertia motor is which electrical excitation signal yields optimum motor characteristics. Three signals and their variants are widely used in literature: sawtooth, parabolic and cycloidic signals. It can be shown that neither of these can drive the motor at its maximum possible velocity in non-resonant operation. Within this paper we propose to use a rigid body model of a simple inertia motor to predict the motor characteristics depending on the movement pattern of the driving element. Advantages and disadvantages of three different drive signals that maximize the motor velocity are discussed.}}, author = {{Hunstig, Matthias and Hemsel, Tobias}}, issn = {{1948-5719}}, journal = {{Journal of Korean Physical Society}}, number = {{4}}, pages = {{938--941}}, title = {{{Drive Signals for Maximizing the Velocity of Piezoelectric Inertia Motors}}}, doi = {{10.3938/jkps.57.938}}, volume = {{57}}, year = {{2010}}, } @article{9752, abstract = {{Piezoelectric inertia motors make use of the inertia of a slider to drive the slider by friction contact in a series of small steps which are generally composed of a stick phase and a slip phase. If the best electrical drive signal for the piezoelectric actuator in an inertia motor is to be determined, its dynamical behaviour must be known. A classic dynamic lumped parameter model for piezoelectric actuators is valid only in resonance and, therefore, is not suitable for modelling the actuator in an inertia motor. A reduced dynamic model is used instead. Its parameters are identified using a step response measurement. This model is used to predict the movement of the actuator in response to a velocity-optimized signal introduced in a separate contribution. Results show that the model cannot represent the dynamical characteristics of the actuator completely. For determining voltage signals that let piezoelectric actuators follow a calculated movement pattern exactly, the model can, therefore, only be used with limitations.}}, author = {{Hunstig, Matthias and Hemsel, Tobias}}, issn = {{1948-5719}}, journal = {{Journal of Korean Physical Society}}, number = {{4}}, pages = {{952--954}}, title = {{{Parameter Identification and Model Validation for the Piezoelectric Actuator in an Inertia Motor}}}, doi = {{10.3938/jkps.57.952}}, volume = {{57}}, year = {{2010}}, } @inproceedings{9753, abstract = {{Piezoelektrische Trägheitsmotoren nutzen die Trägheit einer bewegten Masse, um diese in kleinen Schritten durch abwechselnde Haft- und Gleitphasen voranzutreiben. Eine Kernfrage bei der Entwicklung eines piezoelektrischen Trägheitsmotors ist, welches elektrische Ansteuersignal für das gewünschte Motorverhalten optimal ist. Das elektrische Signal führt zu einer Bewegung des piezoelektrischen Aktors und damit der Antriebsstange, die den reibschlüssigen Vortrieb bewirkt. Entsprechend wird diese Fragestellung in zwei Teilen untersucht: Anhand eines Starrkörpermodells werden zunächst Bewegungsverläufe für die Antriebsstange ermittelt, mit denen die maximale Geschwindigkeit erreicht wird. Dabei werden drei Antriebsmodi identifiziert. Mit allen kann eine höhere Geschwindigkeit als mit der heute häufig verwendeten Sägezahnanregung erreicht werden. Anschließend wird ein einfaches dynamisches Modell eines piezoelektrischen Aktors genutzt, um die notwendigen elektrischen Ansteuersignale für die verschiedenen Antriebsmodi zu bestimmen. Es zeigt sich, dass das gewählte einfache Modell hierzu nur bedingt geeignet ist.}}, author = {{Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}}, booktitle = {{7. Paderborner Workshop Entwurf mechatronischer Systeme}}, editor = {{Gausemeier, Jürgen and Rammig, Franz and Schäfer, Wilhelm and Trächtler, Ansgar}}, issn = {{0924-4247}}, keywords = {{Piezoelektrischer Trägheitsmotoren}}, pages = {{129--141}}, publisher = {{Heinz Nixdorf Institut, Universität Paderborn}}, title = {{{Anregungskonzepte und Modellierung piezoelektrischer Trägheitsmotoren}}}, volume = {{272}}, year = {{2010}}, }