TY - CONF AU - Krauter, Stefan AU - Duwe, H. ID - 8106 T2 - Zwölftes Nationales Symposium für Photovoltaische Energiewandlung, Staffelstein, 26.–28. Februar 1997, Band 1, S. 297–302. TI - Das ECO–PV–System ER - TY - JOUR AU - Krauter, Stefan ID - 8107 JF - Telelearning: Aufgabe und Chance für Bildung und Gesellschaft TI - Lernen über das World–Wide–Web am Beispiel der Sonnenenergienutzung ER - TY - CONF AU - Kerst, U. AU - Krauter, Stefan AU - Hanitsch, Rolf ID - 8108 T2 - Proceedings of the 14th European Photovoltaic Solar Energy Conference, Barcelona (Spanien), 30. Juni – 4. Juli 1997, S. 232–235 TI - Reflection-Losses at Structured PV-Modules ER - TY - GEN AU - Heckel, Reiko AU - Ehrig, Hartmut AU - Wolter, Uwe AU - Corradini, Andrea ID - 8201 TI - Loose Semantics and Constraints for Graph Transformation Systems ER - TY - CONF AU - Gadducci, Fabio AU - Heckel, Reiko ID - 8276 T2 - Proceedings of the Workshop on the General Theory of Graph Transformation Systems (GETGRATS 1997), Bordeaux (France) TI - A 2-Categorical Presentation of Distributed Graph Transformation ER - TY - CONF AU - Gadducci, Fabio AU - Heckel, Reiko AU - Koch, Manuel ID - 8277 T2 - Proceedings of the Workshop on the General Theory of Graph Transformation Systems (GETGRATS 1997), Bordeaux (France) TI - Combining Graph Transformations with Temporal Logic ER - TY - CONF AU - Gadducci, Fabio AU - Heckel, Reiko ID - 8278 T2 - Proceedings of the 12th International Workshop on Recent Trends in Algebraic Development Techniques (WADT 1997), Tarquinia (Italy) TI - An Inductive View of Graph Transformation VL - 1376 ER - TY - CONF AU - Heckel, Reiko ID - 8279 T2 - Proceedings of the Workshop on the General Theory of Graph Transformation Systems (GETGRATS 1997), Bordeaux (France) TI - Compositional Development and Verification of Graph Transformation Systems Based on Views and View Integration ER - TY - CHAP AU - Weber, W AU - Kabst, Rüdiger ED - Klimecki, R ED - Remer, A ID - 6228 T2 - Personal als Strategie TI - Personalwirtschaftliche Strategien im europäischen Vergleich – Eine Analyse organisations- und landesspezifischer Prädiktoren ER - TY - JOUR AU - Mayne, L AU - Valverde, M A I AU - Brewster, C AU - Kabst, Rüdiger ID - 6234 IS - 6 JF - New Developments in Labour Flexibility, Special Issue, Employee Relations: The International Journal TI - New Developments in Labour Flexibility VL - 19 ER - TY - THES AU - Kremer, H.-Hugo ID - 7348 TI - Medienentwicklung - Theoretische Modellierung und fachdidaktisch ausgerichtete Anwendung ER - TY - JOUR AU - Engels, Gregor AU - Jürgen Schneider, Hans ID - 7402 IS - 4 JF - International Journal on Software Engineering and Knowledge Engineering (IJSEKE) TI - Guest Editors' Introduction VL - 7 ER - TY - JOUR AB - The idea of a combined reference model- and view-based specification approach has been proposed recently in the software engineering community. In this paper we present a specification technique based on graph transformations which supports such a development approach. The use of graphs and graph transformations allows to satisfy the general requirements of an intuitive understanding and the integration of static and dynamic aspects on a well-defined and sound semantical base. On this background, formal notions of view and view relation are developed and the behaviour of views is described by a loose semantics. View relations are shown to preserve the behaviour of views. Moreover, we define a construction for the automatic integration of views which assumes that the dependencies between different views are described by a reference model. The views and the reference model are kept consistent manually, which is the task of a model manager. In case of more than two views more general scenarios are developed and discussed. We are able to show that the automatic view integration is compatible with the loose semantics, i.e., the behaviour of the system model is exactly the integration of the behaviours of the views. All concepts and results are illustrated at the well-known example of a banking system. AU - Engels, Gregor AU - Heckel, Reiko AU - Taentzer, Gabriele AU - Ehrig, Hartmut ID - 7403 IS - 4 JF - Int. Journal of Software and Knowledge Engeneering TI - A Combined Reference Model- and View-Based Approach to System Specification VL - 7 ER - TY - CHAP AB - The algebraic approaches to graph transformation are based on the concept of gluing of graphs corresponding to pushouts in suitable categories of graphs and graph morphisms. This allows one to give not only an explicit algebraic or set theoretical description of the constructions but also to use concepts and results from category theory in order to build up a rich theory and to give elegant proofs even in complex situations. In the previous chapter we have presented an overview of the basic notions and problems common to the two algebraic approaches the double pushout DPO approach and the single pushout SPO approach and their solutions in the DPO approach. In this chapter we introduce the SPO approach to graph transformation and some of its main results. We study application conditions for graph productions and the transformation of more general structures than graphs in the SPO approach where similar generalizations have been or could be studied also in the DPO approach. Finally we present a detailed comparison of the DPO and the SPO approach especially concerning the solutions to the problems discussed for both approaches in the previous chapter. AU - Ehrig, Hartmut AU - Heckel, Reiko AU - Korff, Martin AU - Löwe, Michael AU - Ribeiro, Leila AU - Wagner, Annika AU - Corradini, Andrea ID - 7515 T2 - Handbook of Graph Grammars and Computing by Graph Transformations, Volume 1: Foundations TI - Algebraic Approaches to Graph Transformation, Part II: Single Pushout Approach and Comparison with Double Pushout Approach ER - TY - CHAP AU - Engels, Gregor AU - Rekers, Jan AU - Andries, Marc ID - 7516 T2 - Visual Language Theory TI - How to represent a visual specification ER - TY - CHAP AB - The algebraic approaches to graph transformation are based on the concept of gluing of graphs, modelled by pushouts in suitable categories of graphs and graph morphisms. This allows one not only to give an explicit algebraic or set theoretical description of the constructions, but also to use concepts and results from category theory in order to build up a rich theory and to give elegant proofs even in complex situations. In this chapter we start with an overwiev of the basic notions common to the two algebraic approaches, the double-pushout (DPO) approach and the singlepushout (SPO) approach; next we present the classical theory and some recent development of the double-pushout approach. The next chapter is devoted instead to the single-pushout approach, and it is closed by a comparison between the two approaches. AU - Corradini, Andrea AU - Montanari, Ugo AU - Rossi, Francesca AU - Ehrig, Hartmut AU - Heckel, Reiko AU - Löwe, Michael ID - 7517 T2 - Handbook of Graph Grammars and Computing by Graph Transformation, Volume 1: Foundations TI - Algebraic Approaches to Graph Transformation, Part I: Basic Concepts and Double Pushout Approach ER - TY - CHAP AU - Euler, D. AU - Kremer, H.-Hugo AU - Theis, M. ED - Euler, D. ED - Kremer, H.-H. ED - Theis, M. ID - 8421 T2 - Meisterprüfung - Lernen für die Praxis, Ausbilden im Handwerk TI - Grundfragen der Berufsbildung ER - TY - JOUR AU - Kremer, H.-Hugo AU - Sloane, Peter F. E. ID - 8470 IS - 1 JF - Erziehungswissenschaft und Beruf TI - Didaktik des Rechnungswesens ER - TY - CONF AU - Goldschmidt, Stefan AU - Hemsel, Tobias AU - Krome, Jürgen AU - Storck, Heiner AU - Wallaschek, Jörg ID - 8898 T2 - Tagungsband zum 4. Laser Vibrometer Seminar der Polytec GmbH TI - Schwingungsprüfstand zur vollautomatischen Messung von Ultraschallschwingungen in piezoelektrischen Antrieben ER - TY - CONF AB - Piezoelectric ultrasonic motors are a new kind of actuators that produce high driving-forces related to their volume. Beside rotary drives like the travelling wave motor many linear drives have been developed and are already commercially available today. These motors can provide static holding-forces and driving-forces of up to 30 N at velocities of up to 220 mm/s. These operational characteristics, which are expected to be improved continuously, make these devices attractive as direct-drives for sliding roofs or windows in automobiles. In this contribution a short outline of the present state-of-the-art of linear ultrasonic motors is given. Different operating principles are compared with respect to the potential driving-force and power. Finally the working-principle of a newly developed motor, which uses the piezoelectric d33-effect, is explained in detail. Theoretical and experimental results show that this motor is capable of achieving high driving-force and rated output-power AU - Hemsel, Tobias AU - Wallaschek, Jörg ID - 8900 T2 - Proceedings of the 30th International Symposium on Automotive Technology \& Automation (ISATA) TI - Ultrasonic motors for linear positioning tasks in automobiles ER -