@article{7307, author = {{Kremer, H.-Hugo and Ertl, Hubert}}, journal = {{bwp@ Berufs- und Wirtschaftspädagogik - online}}, number = {{2}}, title = {{{Innovationen in schulischen Kontexten - Ansatzpunkte für berufsbegleitende Lernprozesse bei Lehrkräften}}}, year = {{2005}}, } @article{7378, author = {{Huma, Zille and Rehman, Muhammad and Iftikhar, Nadeem}}, journal = {{Journal of Computer Science and Technology}}, number = {{6}}, pages = {{788--796}}, title = {{{An Ontology-Based Framework for Semi-Automatic Schema Integration}}}, volume = {{20}}, year = {{2005}}, } @article{7379, abstract = {{eLearning supports the education in certain disciplines. Here, we report about novel eLearning concepts, techniques, and tools to support education in Software Engineering, a subdiscipline of computer science. We call this "Software Engineering eLearning". On the other side, software support is a substantial prerequisite for eLearning in any discipline. Thus, Software Engineering techniques have to be applied to develop and maintain those software systems. We call this "eLearning Software Engineering". Both aspects have been investigated in a large joint, BMBF-funded research project, termed MuSofT (Multimedia in Software Engineering). The main results are summarized in this paper.}}, author = {{Doberkat, Ernst-Erich and Engels, Gregor and Hendrik Hausmann, Jan and Lohmann, Marc and Pleumann, Jörg and Schröder, Jens}}, journal = {{e-learning and education (eleed) Journal}}, title = {{{Software Engineering and eLearning: The MuSofT Project}}}, volume = {{2}}, year = {{2005}}, } @article{7380, author = {{Baresi, Luciano and Heckel, Reiko and Thöne, Sebastian and Varró, Dániel}}, journal = {{Software and Systems Modeling}}, number = {{2}}, pages = {{187--207}}, title = {{{Style-Based Modeling and Refinement of Service-Oriented Architectures}}}, volume = {{5}}, year = {{2005}}, } @article{7381, abstract = {{Web services are software components that can be discovered and employed at runtime using the Internet. Conflicting requirements towards the nature of these services can be identified. From a business perspective, Web services promise to enable the formation of ad-hoc cooperations on a global scale. From a technical perspective, a high degree of standardization and rigorous specifications are required to enable the automated integration of Web services. A suitable technology for Web services has to mediate these needs for flexibility and stability. To be usable in practice, this technology has to be aligned to standard software engineering practice to allow for a seamless development of Web service enabled components. In this paper, we introduce a new approach to the description of Web services. It is a visual approach based on the use of software models and graph transformations and allows for the flexible description of innovative services while providing a precise matching concept. A methodology enabling the seamless development of such Web service descriptions in the context of a standard model-based development approach is presented.}}, author = {{Hendrik Hausmann, Jan and Heckel, Reiko and Lohmann, Marc}}, journal = {{International Journal of Web Services Research}}, number = {{2}}, pages = {{67--85}}, title = {{{Model-based development of Web service descriptions enabling a precise matching concept}}}, volume = {{2}}, year = {{2005}}, } @inbook{7447, author = {{Bliemel, F and Eggert, A and Fassott, G and Henseler, J}}, booktitle = {{Handbuch PLS-Pfadmodellierung: Methoden, Anwendung, Praxisbeispiele}}, editor = {{Bliemel, F and Eggert, A and Fassott, G and Henseler, J}}, pages = {{9--16}}, publisher = {{Schäffer-Poeschel}}, title = {{{Die PLS-Pfadmodellierung: Mehr als eine Alternative zur Kovarianzstrukturanalyse}}}, year = {{2005}}, } @inbook{7456, author = {{Fassott, G and Eggert, A}}, booktitle = {{Handbuch PLS-Pfadmodellierung: Methoden, Anwendung, Praxisbeispiele}}, editor = {{Bliemel, F and Eggert, A and Fassott, G and Henseler, J}}, pages = {{31--47}}, publisher = {{Schäffer-Poeschel}}, title = {{{Zur Verwendung formativer und reflektiver Indikatoren in Strukturgleichungsmodellen: Bestandsaufnahme und Anwendungsempfehlungen}}}, year = {{2005}}, } @inbook{7458, author = {{Eggert, A and Fassott, G and Helm, S}}, booktitle = {{Handbuch PLS-Pfadmodellierung: Methoden, Anwendung, Praxisbeispiele}}, editor = {{Bliemel, F and Eggert, A and Fassott, G and Henseler, J}}, pages = {{101--116}}, publisher = {{Schäffer-Poeschel}}, title = {{{Identifizierung und Quantifizierung mediierender und moderierender Effekte in komplexen Kausalstrukturen}}}, year = {{2005}}, } @inbook{7544, abstract = {{This chapter presents the concepts of our Model Execution Platform (MEP). The MEP is an approach to executable UML for the design of hardware and software systems covering Class, State Machine, and Activity Diagrams. We present how the MEP is employed for Handel-C code generation and briefly sketch the concepts of a MEP based UML virtual machine.}}, author = {{Schattkowsky, Tim and Mueller, Wolfgang and Rettberg, Achim}}, booktitle = {{UML for SoC Design}}, editor = {{Martin, G. and Mueller , W. }}, pages = {{63--88}}, publisher = {{Springer}}, title = {{{A Generic Model Execution Platform for the Design of Hardware and Software}}}, year = {{2005}}, } @inbook{7546, abstract = {{This chapter provides an introduction to the Unified Modeling Language (UML), a widely adopted object-oriented modeling standard, and shows how the language can be applied to (business) process modeling. As major perspectives of process modeling with UML 2.0, the chapter covers control flow, data objects and object flow, organizational structure, business partner interactions, and system-specific process models. Various types of UML diagrams are presented with a special focus on how these diagrams fit together and complement each other to form a coherent view of a process. Moreover, a running example is used throughout the chapter to illustrate the different facets of a process model.}}, author = {{Engels, Gregor and Förster, Alexander and Heckel, Reiko and Thöne, Sebastian}}, booktitle = {{Process-Aware Information Systems}}, editor = {{Dumas, M. and van der Aalst, W. and ter Hofstede, A.}}, pages = {{85--117}}, publisher = {{Wiley}}, title = {{{Process Modeling using UML}}}, year = {{2005}}, } @inbook{7547, abstract = {{Modularization is a well-known concept to structure software systems as well as their specifications. Modules are equipped with export and import interfaces and thus can be connected with other modules requesting or providing certain features. In this paper, we study modules the interfaces of which consist of behavioral specifications given by typed graph transformation systems. We introduce a framework for classifying and systematically defining relations between typed graph transformation systems. The framework comprises a number of standard ingredients, like homomorphisms between type graphs and mappings between sets of graph transformation rules. The framework is applied to develop a novel concept of substitution morphism by separating preconditions and effects in the specification of rules. This substitution morphism is suited to define the semantic relation between export and import interfaces of requesting and providing modules.}}, author = {{Engels, Gregor and Heckel, Reiko and Cherchago, Alexey}}, booktitle = {{Formal Methods in Software and System Modeling. Essays Dedicated to Hartmut Ehrig on the Occasion of His 60th Birthday}}, editor = {{ Kreowski, U. Montanari, F. Orejas, G. Rozenberg, G. Taentzer, H.-J.}}, pages = {{38--63}}, publisher = {{Springer}}, title = {{{Flexible Interconnection of Graph Transformation Modules - A Systematic Approach}}}, volume = {{3393}}, year = {{2005}}, } @inbook{7548, abstract = {{In der modellbasierten Softwareentwicklung wird ein Softwaresystem durch verschiedene Teilmodelle auf unterschiedlichen Abstraktionsstufen und aus verschiedenen Sichten modelliert. Das Ziel von Konsistenzmanagement im Entwicklungsprozess ist es, eine gewisse Form von Konsistenz der Teilmodelle zu gewährleisten. Da objektorientierte Verhaltensmodelle keine eindeutige formale Semantik haben und sehr unterschiedlich eingesetzt werden, ist ein Konsistenzmanagement dieser Modelle besonders schwierig. In der Arbeit werden sowohl Grundlagen als auch Techniken für ein systematisches Konsistenzmanagement entwickelt und am praktischen Beispiel erprobt.}}, author = {{Küster, Jochen}}, booktitle = {{Ausgezeichnete Informatikdissertationen 2004}}, editor = {{Wagner, T. Dreier, O. Günther, S. Hölldobler, K.-P. Löhr, P. Molitor, R. Reischuk, D. Saupe, D.}}, publisher = {{Gesellschaft für Informatik (GI)}}, title = {{{Konsistenzmanagement von objektorientierten Verhaltensmodellen}}}, volume = {{D5}}, year = {{2005}}, } @phdthesis{7582, abstract = {{A good architectural design allows to capture the overall complexity of large, distributed systems at a higher level of abstraction. This is especially important for reconfigurable systems where the architectural configuration is subject to (constant) changes at runtime. When designing such a dynamic architecture, the software architect has to bring the functional business requirements and the available communication and reconfiguration mechanisms of the intended target platform in line. As it is a complex task to incorporate these often diverging requirements into the architectural model, we propose a stepwise approach similar to the MDA initiative. We start with a platformindependent model capturing the business requirements and add platform-specific details in a later step. For each level of platform abstraction and associated platform, we define an architectural style which describes the characteristics of the platform. This way, conformance to the architectural style entails consistency with the underlying platform. Besides run-time configurations of components and connections, architectural models also comprise the description of processes that control the communication and reconfiguration behavior. To provide operational semantics, architectural models are formalized as graphs, and architectural styles are formalized as graph transformation systems. UML is added as high-level modeling language on top, and profiles are used to adapt UML to certain architectural styles. Due to the stepwise procedure, we also have to ensure the mutual consistency between models at different levels of abstraction. For this purpose, we define formal criteria which require that both structural and behavioral properties are preserved at the lower level of abstraction. Based on refinement relationships between abstract and platform-specific architectural styles, an algorithm allows to verify that all abstract, business-level behavior can also be realized in the platformspecific architecture and that no new behavior is added. These refinement techniques facilitate a stepwise, platform-consistent development of dynamic software architectures.}}, author = {{Thöne, Sebastian}}, title = {{{Dynamic Software Architectures: A Style-Based Modeling and Refinement Technique with Graph Transformations}}}, year = {{2005}}, } @phdthesis{7583, abstract = {{This thesis describes an approach for automated detection of concurrent liveness failures in the execution of Java programs. Concurrent programs are highly prone to failure because of the inherent nondeterminism. Developers of concurrent Java programs are not well supported in detecting concurrency failures, i.e. failures that are due to interactions between multiple threads. These failures are neither well documented nor do tools like debuggers allow developers to identify them at runtime. This thesis analyses and classifies liveness failures, a special kind of concurrency failures, and the associated potentials in Java. A UML statechart is developed that models the interaction of Java threads. Liveness failures and potentials are specified formally in terms of the states controlling the interaction of threads and in terms of the events exchanged by interacting threads. Detection algorithms are developed to identify the specified failures in a program execution. A UML profile extending UML interaction diagrams is developed to visualise the execution of concurrent Java programs and detected liveness failures and potentials. In order to deploy the algorithms and the UML profile, tool support concepts are provided. This involves the specification of a trace format and a tracing method to collect execution data from a running Java program, and the specification of methods to analyse the trace and to visualise the trace and the analysis results. The concepts are implemented in the JAVIS prototype, which consists of a Java tracer with an analysis facility for monitoring liveness in concurrent Java programs, and a plug-in extension to the UML CASE tool Together for importing and displaying concurrent Java traces including failures and potentials.}}, author = {{Mehner, Katharina}}, title = {{{Trace-based Debugging and Visualisation of Concurrent Java Programs with UML}}}, year = {{2005}}, } @phdthesis{7584, abstract = {{The technique of Dynamic Meta Modeling allows for specifying the semantics of visual modeling languages (like, e.g., the Unified Modeling Language, UML). It is aimed at combining formal rigor (allowing for automated processing of expressions in the language and reasoning about them) with a user-friendly visual notation. We do explicitly exploit the meta modeling paradigm to provide our formalizations within a form known to the expected user base. Technically, DMM uses an innovative combination of elements from denotational and operational semantics together with Graph Transformations. The thesis furthermore introduces a technically richer concept of relations to the Meta Object Facility (MOF). As an extended application example the core semantics of UML Activity Diagrams are formalized within this thesis. Pragmatic guidelines to formulate specifications in DMM and tool support to test the effect of such specifications complete the thesis.}}, author = {{Hendrik Hausmann, Jan}}, title = {{{Dynamic Meta Modeling: A Semantics Description Technique for Visual Modeling Languages}}}, year = {{2005}}, } @article{7653, author = {{Choi, Y.-S. and Hennessy, K. and Sharma, R. and Haberer, E. and Gao, Y. and DenBaars, S. P. and Nakamura, S. and Hu, E. L. and Meier, Cedrik}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{24}}, publisher = {{AIP Publishing}}, title = {{{GaN blue photonic crystal membrane nanocavities}}}, doi = {{10.1063/1.2147713}}, volume = {{87}}, year = {{2005}}, } @article{7654, author = {{Lüttjohann, Stephan and Meier, Cedrik and Lorke, Axel and Reuter, Dirk and Wieck, Andreas D.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{16}}, publisher = {{AIP Publishing}}, title = {{{Screening effects in InAs quantum-dot structures observed by photoluminescence and capacitance-voltage spectra}}}, doi = {{10.1063/1.2112192}}, volume = {{87}}, year = {{2005}}, } @article{7655, author = {{David, A. and Meier, Cedrik and Sharma, R. and Diana, F. S. and DenBaars, S. P. and Hu, E. and Nakamura, S. and Weisbuch, C. and Benisty, H.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{10}}, publisher = {{AIP Publishing}}, title = {{{Photonic bands in two-dimensionally patterned multimode GaN waveguides for light extraction}}}, doi = {{10.1063/1.2039987}}, volume = {{87}}, year = {{2005}}, } @article{7656, author = {{Sharma, R. and Haberer, E. D. and Meier, Cedrik and Hu, E. L. and Nakamura, S.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{5}}, publisher = {{AIP Publishing}}, title = {{{Vertically oriented GaN-based air-gap distributed Bragg reflector structure fabricated using band-gap-selective photoelectrochemical etching}}}, doi = {{10.1063/1.2008380}}, volume = {{87}}, year = {{2005}}, } @article{7657, author = {{Kravets, Vasyl G. and Meier, Cedrik and Konjhodzic, Denan and Lorke, Axel and Wiggers, Hartmut}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, number = {{8}}, publisher = {{AIP Publishing}}, title = {{{Infrared properties of silicon nanoparticles}}}, doi = {{10.1063/1.1866475}}, volume = {{97}}, year = {{2005}}, }