@inproceedings{39357, abstract = {{Engineering collaboration gets its new global dimension with the omnipotent access to Internet. Engineers have severe requirements concerning: security of design data, quality of net connections, easiness of collaboration, etc. This article presents visions and middleware architecture to establish pan-European col- laborative engineering infrastructure and its application in the field of Electronic Design Automation (EDA). We present a transparent infrastructure to engineers to enable their Internet-based collaboration during the de- sign of complex electronic systems. In thi s context, we introduce an advanced collaborative infrastructure (ACI) for distance spanning, tool integration, and administration as well as open interfaces for XML-based data exchange. ACI constitutes a backbone for our collaborative research and engineering studies by fostering a combination of most recent plug-and-play technologies and secure, peer-to-peer data transfer with XML- based tool integration. ACI and its deployments have been developed with the EU project E-Colleg (IST- 1999-11746).}}, author = {{Kostienko, Tomasz and Müller, Wolfgang and Pawlak, Adam and Schattkowsky, Tim}}, booktitle = {{Proceedings of CE 2003}}, title = {{{An Advanced Infrastructure for Collaborative Engineering in Electronic Design Automation}}}, year = {{2003}}, } @inproceedings{39355, abstract = {{This pap er presents an approach to extend OSGi server based home networks with JXTA's p eer-to- p eer (P2P) technology to a multi-server home envi- ronment connecting multiple private home networks to one true virtual environment for communication, media sharing/exchange, and distributed device con- trol. We elab orate on the basic integration metho d- ology and extend it to a general, security preserv- ing, architectural concept based on a two level inte- gration concept for inhome and interhome networks. The integration is achieved through additional OSGi services for the management of virtual devices, p eer- to-p eer communication, and authentication. The ex- ample of a Quality of Service based video streaming management demonstrates one of the p otential ad- vanced application for which p eer-to-p eer can b e used in addition.}}, author = {{Loeser, Chris and Müller, Wolfgang and Berger, Franz and Eikerling, Heinz-Josef}}, booktitle = {{Proceedings of HICCS-36}}, title = {{{Peer-to-Peer for Virtual Home Environments}}}, year = {{2003}}, } @inproceedings{39354, author = {{Eikerling, Heinz-Josef and Müller, Wolfgang and Schattkowski, Tim and Wegner, J.}}, booktitle = {{Proceedings of DATE’03}}, title = {{{Tool Integration and Management in Heterogeneous Computer Networks}}}, year = {{2003}}, } @inproceedings{39365, abstract = {{Large-scale mobility in the era of embedded and mobile computers yields significant challenges with respect to personalization, networking, and security. Currently, mobile computing devices cannot be seamlessly and flexibly obtain information about the context in which computing takes place. This requires dedicated personalization and localization in combination with advanced autocustomization techniques in order to adapt them to the needs of the current context. For natural interaction, for instance, many devices offer different input and output modalities, which enable different modes of operation to perform the same task. Auto-customization of modalities and devices in range can be obtained, if the system has sufficient information on the user’s preferences, abilities, the current situation, and the device that performs a specific task. To aid the system’s decision, we propose a set of interrelated and expandable profiles, which are prepared for automated adaptation, what will play a central part in making the technology to become invisible.}}, author = {{Schäfer, Robbie and Müller, Wolfgang}}, booktitle = {{Proceedings of the Joint Workshop IJCAI Workshop on Artificial Intelligence, Information Access, and Mobile Computing}}, title = {{{Adaptive profiles for Multi-Modal Interaction in Intelligent Frameworks}}}, year = {{2003}}, } @inproceedings{39364, abstract = {{The textual Object Constraint Language (OCL) is an of- ficial part of the Unified Modeling Language (UML). OCL is primarily used to formulate restrictions over UML mod- els, in particular, invariants and operation pre- and post- conditions in the context of class diagrams. However, OCL is missing means to specify constraints over the dynamic behavior of a UML model. We have therefore developed a temporal extension of OCL that enables modelers to specify behavioral state-oriented constraints. That work provides an alternative to the rather cryptic temporal logic formulae that are commonly used to specify behavioral system prop- erties. This article now illustrates that our OCL extension al- lows for specifying all kinds of properties that are regarded as relevant in practice. We present according temporal OCL expressions for property specification patterns that have been identified in the area of formal specification.}}, author = {{Flake, Stephan and Müller, Wolfgang}}, booktitle = {{Proceedings of SERP'03}}, keywords = {{UML, Object Constraint Language, Patterns, Property Specification}}, title = {{{Expressing Property Specification Patterns with OCL}}}, year = {{2003}}, } @inproceedings{39366, abstract = {{Computer supported collaborative work (CSCW) is currently of growing interest for application industrial context. Integrated workflow systems are available to allow the integration of globally distributed teams. However, in many areas (i.e. in electronic design automation), tool integration remains to be a critical issue since existing legacy tools have to be integrated into distributed workflows. By integrating tools based on the operational semantics, dynamic assignment and replacement of tools in the workflows becomes possible. We present a middleware for secure collaborative engineering that enables flexible tool management and overcomes existing networking problems through a peer-to-peer based network infrastructure.}}, author = {{Schattkowsky, Tim and Müller, Wolfgang}}, booktitle = {{Proceedings of CCE'03}}, title = {{{Distributed Engineering Environment for the Design of Electronic Systems}}}, year = {{2003}}, } @inproceedings{39363, abstract = {{The textual Object Constraint Language (OCL) is an of- ficial part of the Unified Modeling Language (UML). It is primarily used to formulate restrictions for UML class di- agrams. Additionally, it is possible to refer to UML State- chart states in OCL expressions to reason about currently activated states. However, neither the current OCL standard nor the pro- posal for the new OCL 2.0 version integrate Statecharts on the language definition level, i.e., the semantics of State- chart states in the context of OCL expressions is not suf- ficiently defined so far. To overcome this deficiency, this article provides a formal semantics for state-oriented OCL expressions for application with UML Statecharts.}}, author = {{Flake, Stephan and Müller, Wolfgang}}, booktitle = {{Proceedings of SEKE 2003}}, title = {{{Semantics of State-Oriented Expressions in the Object Constraint Language}}}, year = {{2003}}, } @inproceedings{39367, abstract = {{Confidentiality and security in data access and transmission over multiple open networks are of utmost importance for most collaborative engineering environments. In this article, we review smart card based security technologies for their application in computer-based collaborative engineering environments. We focus on most recent microprocessor-based smart cards and on JavaCard as a development infrastructure and operating system. Since JavaCard supports the integration of multiple applications on one card, it enables smart cards to integrate large sets of additional applications. In that context, we identify and discuss three potential key applications: authentication with biometrics, certification, and advanced profile management.}}, author = {{Wang, J. and Müller, Wolfgang}}, booktitle = {{Proceedings of CCE'03}}, title = {{{SmartCard for Secure Collaborative Engineering}}}, year = {{2003}}, } @inproceedings{39360, author = {{Krupp, Alexander and Müller, Wolfgang}}, title = {{{Formale Verfeinerung und Modelchecking von zeitbehafteten endlichen Automaten}}}, year = {{2003}}, } @inproceedings{39368, author = {{Krupp, Alexander and Müller, Wolfgang}}, booktitle = {{Proceedings of FDL'03}}, title = {{{Combining Formal Refinement and Model Checking for Analysis of Realtime Systems}}}, year = {{2003}}, } @inproceedings{39369, abstract = {{The latest OCL 2.0 proposal provides two semantic descriptions, i.e., a metamodel based semantics that uses UML itself to associate the semantic domain with the language concepts and a formal semantics based on a set-theoretic approach called object model. Unfortunately, these two semantics are currently neither consistent nor complete, as (a) the formal semantics does not consider the newly introduced concept of OCL messages and (b) both semantics lack an integration of Statecharts and a semantic denition of state-related operations. This article focuses on a formal semantics for OCL messages as a foundation for consistency among,the two OCL semantics. We extend object models and present an extended denition of a system state that comprises all relevant information to be able to evaluate OCL expressions also w.r.t. OCL messages.}}, author = {{Flake, Stephan and Müller, Wolfgang}}, booktitle = {{Proceedings of the Workshop OCL 2.0 at UML 2003}}, title = {{{Formal Semantics of OCL Messages}}}, year = {{2003}}, } @inbook{34447, abstract = {{The Object Constraint Language (OCL) was introduced to support the specification of constraints for UML diagrams and is mainly used to formulate invariants and operation pre- and postconditions. Though OCL is also applied in behavioral diagrams, e.g., as guards for state transitions, it is currently not possible to specify constraints concerning the dynamic behavior and timing properties of such diagrams. This article discusses OCL’s application for the dynamic behavior of UML Statechart diagrams and presents an OCL extension for specification of state-oriented time-bounded constraints.We introduce operations to extract state configurations from diagrams and define additional predicates over states and state configurations. The semantics of our OCL extension is given by employing time-bounded Computational Tree Logic (CTL) formulae. An example of a flexible manufacturing system with automated guided vehicles demonstrates the application of our extension.}}, author = {{Flake, Stephan and Müller, Wolfgang}}, booktitle = {{Advances in Object Modelling with the OCL}}, editor = {{Clark, T. and Warmer, J.}}, isbn = {{978-3-540-45669-8}}, keywords = {{Model Check Temporal Logic Object Constraint Language Execution Path Kripke Structure}}, pages = {{150 -- 171}}, publisher = {{Springer-Verlag}}, title = {{{An OCL Extension for Real-Time Constraints}}}, doi = {{10.1007/3-540-45669-4_8}}, year = {{2002}}, } @article{34576, author = {{Eikerling, H. J. and Müller, Wolfgang and Wegener, J.}}, journal = {{it+ti}}, pages = {{128--136}}, publisher = {{Oldenbourg Verlag}}, title = {{{Werkzeugintegration und -verwaltung in heterogenen Computernetzwerken}}}, year = {{2002}}, } @book{53586, editor = {{Bücker, Ulrich and Eikerling, Heinz Josef and Müller, Wolfgang}}, isbn = {{3-826598-84-9}}, title = {{{Proceedings of the VHE Workshop}}}, year = {{2002}}, } @inproceedings{39371, abstract = {{With the increasing availability of various web-enabled mobile devices, content has to be effectively adapted to their different limitations. So, web content need rearrangement, i.e., a transcoding, to better fit on small displays when, for instance, layout specific HTML structures like tables and frames are used. In this article, we present a description language to define generic rules for this purpose and introduce RDL/TT (Rule Description Language for Tree Transformation). RDL/TT specifies sets of transcoding functions generic to user and hardware profiles. A Java-oriented syntax is used to describe the transcoding functions which operate on the DOM (Document Object Model) tree representation of an HTML or XML document.}}, author = {{Schäfer, Robbie and Dangberg, Andreas and Müller, Wolfgang}}, booktitle = {{Proceedings of the VHE Workshop}}, title = {{{RDL/TT - A Description Language for Profile-Dependent Transcoding of XML Documents}}}, year = {{2002}}, } @inproceedings{39370, abstract = {{Within this paper we propose architecture ideas of a distributed Video on Demand network which base on peer to peer technology. Each peer offers video streams to other peers and may receive a video stream from another peer simultaneously. This results in an optimization problem depending on different factors which we approximate with the help of an simulation environment. Our approach bases on a peer to peer framework by Sun called Project JXTA which provides a set of protocols for P2P applications.}}, author = {{Loeser, Chris and Altenbernd, Peter and Ditze, Michael and Müller, Wolfgang}}, booktitle = {{Proceedings of the Intl. Workshop on Real-Time LANs in the Internet Age (RTLIA 2002)}}, title = {{{Distributed Video-on-Demand Services on Peer to Peer Basis}}}, year = {{2002}}, } @inproceedings{39378, author = {{Schäfer, Robbie and Müller, Wolfgang and Dangberg, Andreas}}, booktitle = {{Proceedings of the HICSS-35}}, title = {{{Fuzzy Rules for the Transcoding of HTML Files}}}, year = {{2002}}, } @inproceedings{39398, abstract = {{This article presents a UML profile for an OCL extension that enables modelers to specify behavioral, state-oriented real-time constraints in OCL. In order to perform a seamless integration into the upcoming UML2.0 standard, we take the latest OCL2.0 metamodel proposal by Warmer et al. [22] as a basis. A formal semantics of our temporal OCL extension is given by a mapping to time-annotated temporal logics formulae. To give an example of the applicability of our extension, we consider a modeling approach for manufacturing systems called MFERT. We present a corresponding UML profile for that approach and combine both profiles for formal verification by real-time model checking.}}, author = {{Flake, Stephan and Müller, Wolfgang}}, booktitle = {{Proceedings of the UML 2002 - The Unified Modeling Language}}, publisher = {{Springer-Verlag}}, title = {{{A UML Profile for Real-Time Constraints with the OCL}}}, year = {{2002}}, } @inproceedings{39393, author = {{Dangelmeier, Wilhelm and Darnedde, C. and Flake, Stephan and Müller, Wolfgang and Pape, U.}}, title = {{{Graphische Spezifikation und Echtzeitverifikation von Produktionsautomatisierungssystemen}}}, year = {{2002}}, } @inproceedings{39382, abstract = {{We present a rigorous but transparent semantics definition of the SpecC language that covers the execution of SpecC behaviors and their interaction with the kernel process. The semantics include wait, wait for, par, and try statements as they are introduced in SpecC. We present our definition in form of distributed abstract state machine (ASM) rules strictly following the lines of the SpecC Language Reference Manual. We mainly see our formal semantics in three application areas. First, it is a concise, unambiguous description for documentation and standardization. Second, it applies as a high-level, pseudo code-oriented specification for the implementation of a SpecC simulator. Finally, it is a first step for SpecC synthesis in order to identify similar concepts with other languages like VHDL and SystemC for the definition of common patterns and language subsets.}}, author = {{Müller, Wolfgang and Dömer, Rainer and Gerstlauer, Andreas}}, booktitle = {{Proceedings of the ISSS02}}, isbn = {{1-58113-576-9}}, keywords = {{Standardization, Kernel, Permission, Formal verification, Logic functions, Documentation, Reasoning about programs, Specification languages, Formal specifications, Software systems}}, title = {{{The Formal Execution Semantics of SpecC}}}, doi = {{10.1145/581199.581234 }}, year = {{2002}}, }