@inproceedings {INPROC-2011-87, author = {Jorge Minguez and Florian Niedermann and Bernhard Mitschang}, title = {{A provenance-aware service repository for EAI process modeling tools}}, booktitle = {IEEE International Conference on Information Reuse and Integration 2011 (IRI '11)}, address = {Las Vegas}, publisher = {IEEE Press}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {42--47}, type = {Conference Paper}, month = {August}, year = {2011}, doi = {10.1109/IRI.2011.6009518}, keywords = {EAI process modeling tool; business process; business service; data interoperability; enterprise application integration; functional interoperability; manufacturing domain; process lifecycle management; provenance aware service repository; provenance data model; provenance subscription capabilities; service engineering methods; service knowledge base; service reusability; business data processing; knowledge based systems; manufacturing industries; open systems}, language = {English}, cr-category = {D.2.11 Software Engineering Software Architectures, D.2.13 Software Engineering Reusable Software}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {One of the major challenges for Enterprise Application Integration (EAI) process modeling tools is the continuous adaptation of the business processes and services. Business and IT specialists are both confronted with a number of problems involved in the adaptation of such processes, such as the lack of support for process lifecycle management, data and functional interoperability problems or the appropriate service knowledge base. Currently, most service engineering methods adopt a lifecycle strategy for the design, implementation, deployment and evaluation of services. However, enterprises exploiting service reusability lack the knowledge on process dependencies across the entire service lifecycle. This knowledge is required by process modeling tools in order to keep EAI processes loosely-coupled. Using a provenance data model we describe the different types of service dependencies in EAI processes with regard to the service changes across its lifecycle. We present a provenance-aware service repository with provenance subscription capabilities and its adoption for different use cases in the manufacturing domain.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-87&engl=1} } @inproceedings {INPROC-2011-86, author = {Nazario Cipriani and Oliver Schiller and Bernhard Mitschang}, title = {{M-TOP: Multi-target Operator Placement of Query Graphs for Data Streams}}, booktitle = {Proceedings of the 15th International Database Engineering and Applications Symposium (IDEAS 2011)}, publisher = {ACM}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {52--60}, type = {Conference Paper}, month = {September}, year = {2011}, language = {English}, cr-category = {G.1.6 Numerical Analysis Optimization, C.2.3 Network Operations}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Nowadays, many applications processes stream-based data, such as financial market analysis, network intrusion detection, or visualization applications. To process stream-based data in an applicationindependent manner, distributed stream processing systems emerged. They typically translate a query to an operator graph, place the operators to stream processing nodes, and execute them to process the streamed data. The operator placement is crucial in such systems, as it deeply influences query execution. Often, different stream-based applications require dedicated placement of query graphs according to their specific objectives, e.g. bandwidth not less than 500 MBit/s and costs not more that 1 cost unit. This fact constraints operator placement. Existing approaches do not take into account application-specific objectives, thus not reflecting application-specific placement decisions. As objectives might conflict among each other, operator placement is subject to delicate trade-offs, such as bandwidth maximization is more important than cost reduction. Thus, the challenge is to find a solution which considers the application-specific objectives and their trade-offs. We present M-TOP, an QoS-aware multi-target operator placement framework for data stream systems. Particularly, we propose an operator placement strategy considering application-specific targets consisting of objectives, their respective trade-offs specifications, bottleneck conditions, and ranking schemes to compute a suitable placement. We integrated M-TOP into NexusDS, our distributed data stream processing middleware, and provide an experimental evaluation to show the effectiveness of M-TOP.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-86&engl=1} } @inproceedings {INPROC-2011-85, author = {Nazario Cipriani and Matthias Grossmann and Harald Sanftmann and Bernhard Mitschang}, title = {{Design Considerations of a Flexible Data Stream Processing Middleware}}, booktitle = {Proceedings of the 15th East-European Conference on Advances in Databases and Information Systems (ADBIS 2011)}, publisher = {CEUR-WS.org}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {222--231}, type = {Conference Paper}, month = {September}, year = {2011}, language = {German}, cr-category = {K.6.1 Project and People Management}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Techniques for efficient and distributed processing of huge, unbound data streams have made some impact in the database community. Distributed data stream processing systems have emerged providing a distributed environment to process these potentially unbound streams of data by a set of processing nodes. A wide range of realtime applications process stream-based data. Sensors and data sources, such as position data of moving objects, continuously produce data that is consumed by, e.g., location-aware applications. Depending on the domain of interest, the processing of such data often depends on domain-specific functionality. For instance, an application which visualizes stream-based data has stringent timing constraints, or may even need a specific hardware environment to smoothly process the data. Furthermore, users may add additional constraints. E.g., for security reasons they may want to restrict the set of nodes that participates in processing. In this paper we review context-aware applications which, despite their different application fields, share common data processing principles. We analyse these applications and extract common requirements which data stream processing systems must meet to support these applications. Finally, we show how such applications are implemented using NexusDS, our extensible stream processing middleware.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-85&engl=1} } @inproceedings {INPROC-2011-64, author = {Michael Abel and Peter Klemm and Stefan Silcher and Jorge Minguez}, title = {{Start-Up of Reconfigurable Production Machines with a Service-Oriented Architecture}}, booktitle = {Proceedings of the 21st International Conference on Production Research}, publisher = {Fraunhofer IAO}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {1--5}, type = {Conference Paper}, month = {August}, year = {2011}, language = {English}, cr-category = {D.2.11 Software Engineering Software Architectures}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Starting-up production machines takes a considerable part of time and development expenses. Especially in the case of reconfigurable machines a short start-up phase is essential. Many activities, which are necessary during the start-up, can be automated. These are the configuration of mechatronic modules, control- and fieldbus systems as well as the extensive testing of functions. This paper presents an approach based on a service- oriented architecture (SOA) to automate the start-up of a reconfigurable production machine. Functionality for configuration and start-up is provided by an internal middleware system. The sequence control for the startup process is realised within a configuration system. A new approach to the combination of field-bus and middleware communication infrastructure is used to adopt SOA paradigms to existing automation technology. Thus, real-time communication can be combined with flexible communication for the automatic configuration of production machines.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-64&engl=1} } @inproceedings {INPROC-2011-57, author = {Andreas Brodt and Oliver Schiller and Bernhard Mitschang}, title = {{Efficient resource attribute retrieval in RDF triple stores}}, booktitle = {Proceeding of the 20th ACM conference on Information and knowledge management (CIKM)}, publisher = {Association for Computing Machinery (ACM)}, institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany}, type = {Conference Paper}, month = {October}, year = {2011}, keywords = {RDF; SPARQL}, language = {English}, cr-category = {H.2.4 Database Management Systems, H.2.2 Database Management Physical Design}, contact = {andreas.brodt@ipvs.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {The W3C Resource Description Framework (RDF) is gaining popularity for its ability to manage semi-structured data without a predefined database schema. So far, most RDF query processors have concentrated on finding complex graph patterns in RDF, which typically involves a high number of joins. This works very well to query resources by the relations between them. Yet, obtaining a record-like view on the attributes of resources, as natively supported by RDBMS, imposes unnecessary performance burdens, as the individual attributes must be joined to assemble the final result records. We present an approach to retrieve the attributes of resources efficiently. We first determine the resources in question and then retrieve all their attributes efficiently at once, exploiting contiguous storage in RDF indexes. In addition, we present an index structure which is specifically designed for RDF attribute retrieval. In a performance evaluation we show that our approach is clearly superior for larger numbers of retrieved attributes.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-57&engl=1} } @inproceedings {INPROC-2011-42, author = {Jorge Minguez and Peter Reimann and Sema Zor}, title = {{Event-driven Business Process Management in Engineer-to-Order Supply Chains}}, booktitle = {Proceedings of the 15th International Conference on Computer Supported Cooperative Work in Design}, publisher = {IEEE}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {1--8}, type = {Conference Paper}, month = {June}, year = {2011}, keywords = {Event-driven Architecture; Service-oriented Architecture; SOA; EDA; Engineer-to-Order; ETO; Supply chain}, language = {English}, cr-category = {D.2.11 Software Engineering Software Architectures, D.2.13 Software Engineering Reusable Software}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems; University of Stuttgart, Institute of Architecture of Application Systems}, abstract = {Integration efforts in today’s manufacturing environments tend to enable service-based communication interfaces between enterprise and manufacturing systems. Constantly changing business conditions demand a high level of flexibility in business processes as well as an adaptive and fully interoperable IT infrastructure. The principles of reusability and loosely-coupled services have driven Service Oriented Architecture (SOA) to become the most used paradigm for software design at the business level. In a manufacturing environment, event-driven architectures (EDA) are often employed for managing information flows across different production systems. The timely propagation of business-relevant events is a fundamental requirement in Engineer-to-Order (ETO) enterprises, which require a high level of transparency in their supply chains. Agility is one of the top priorities for ETO manufacturers in order to react to turbulent scenarios. Therefore, the main challenge for ETO supply chains is to identify and propagate events across the ETO logistics network and integrate these into the manufacturer business processes. We present how an existing service-oriented integration platform for manufacturing can be used to fill the gap between EDA-based manufacturing environments of an ETO supply chain and SOA-based manufacturer business processes. In this paper, we discuss the benefits of the Business Process Execution Language (BPEL) as vehicle for this integration. The adoption of BPEL will enable an efficient and effective reaction to turbulent manufacturing scenarios in an ETO supply chain.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-42&engl=1} } @inproceedings {INPROC-2011-41, author = {Jorge Minguez and David Baureis and Donald Neumann}, title = {{Providing Coordination and Goal Definition in Product-Service Systems through Service-oriented Computing}}, booktitle = {Proceedings of the 44th CIRP International Conference on Manufacturing Systems}, publisher = {CIRP}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {7--12}, type = {Conference Paper}, month = {June}, year = {2011}, keywords = {Manufacturing; Product-Service Systems, PSS, Service-oriented Architecture, SOA}, language = {English}, cr-category = {D.2.11 Software Engineering Software Architectures, D.2.13 Software Engineering Reusable Software}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Product-Service Systems (PSS) are a strategic approach that offers manufacturing companies the possibility of long-term differentiation against competitors by integrating goods and services. The implementation of a PSS entails challenges for the resulting supply chain structure and the IT infrastructure supporting coordinated service offerings, such as conflicting goals and coordination in the integrated business processes. The Service-oriented Architecture (SOA) paradigm, based on loosely-coupled components, provides rapid reconfiguration of business processes, rapid integration of services and goal definition through service level agreements. This paper presents a PSS service analysis methodology, which supports coordination and definition of goals in heterogeneous supply chains.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-41&engl=1} } @inproceedings {INPROC-2011-40, author = {Jorge Minguez and Stefan Silcher and Bernhard Mitschang and Engelbert Westk{\"a}mper}, title = {{Towards Intelligent Manufacturing: Equipping SOA-based Architectures with advanced SLM Services}}, booktitle = {Proceedings of the 44th CIRP International Conference on Manufacturing Systems}, publisher = {CIRP}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {1--8}, type = {Conference Paper}, month = {June}, year = {2011}, keywords = {Service Oriented Architecture; Manufacturing; Service Lifecycle Management; SOA; SLM; Adaptability; Wandlungsf{\"a}higkeit}, language = {English}, cr-category = {D.2.11 Software Engineering Software Architectures, D.2.13 Software Engineering Reusable Software}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {The vision of knowledge-based and intelligent manufacturing systems is driving the development of system architectures, which can seamlessly manage information flows across multiple heterogeneous manufacturing systems and provide the necessary services to support the execution of production processes. Constantly changing business conditions and turbulent scenarios force manufacturing companies to continuously adapt their business processes and manufacturing systems. In such a context, a flexible infrastructure that supports the full integration of processes and adapts its services is needed. This paper presents an innovative semantic service framework that enables the adoption of service lifecycle management (SLM) in an SOA-based integration framework.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-40&engl=1} } @inproceedings {INPROC-2011-39, author = {Stefan Silcher and Jorge Minguez and Bernhard Mitschang}, title = {{Adopting the Manufacturing Service Bus in a Service-based Product Lifecycle Management Architecture}}, booktitle = {Proceedings of the 44th International CIRP Conference on Manufacturing Systems: ICMS '11; Madison, Wisconsin, USA, May 31 - June 3, 2011}, publisher = {Online}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {1--6}, type = {Conference Paper}, month = {June}, year = {2011}, keywords = {Information; System Architecture; Product Lifecycle Management; Service Oriented Architecture; Enterprise Service Bus}, language = {English}, cr-category = {D.2.11 Software Engineering Software Architectures, D.2.13 Software Engineering Reusable Software}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Service-oriented computing is nowadays a rising technology to implement business processes in an efficient and flexible manner. This technology has a great impact on manufacturing environments. The realization of Product Lifecycle Management (PLM) with a Service Oriented Architecture (SOA) has many benefits. Some advantages are a seamless and flexible integration of all applications within PLM, including legacy systems, improved data provisioning and a reduced complexity by using a common service-based integration middleware, such as the Manufacturing Service Bus (MSB). In this paper the integration of the MSB into the service-oriented PLM approach will be described in detail.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-39&engl=1} } @inproceedings {INPROC-2011-37, author = {Sylvia Radesch{\"u}tz and Marko Vrhovnik and Holger Schwarz and Bernhard Mitschang}, title = {{Exploiting the Symbiotic Aspects of Process and Operational Data for Optimizing Business Processes}}, booktitle = {Proc. of the 12th IEEE International Conference on Information Reuse and Integration (IRI 2011)}, address = {Las Vegas, USA}, publisher = {IEEE}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {1--6}, type = {Conference Paper}, month = {August}, year = {2011}, language = {English}, cr-category = {H.2.4 Database Management Systems}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {A profound analysis of all relevant business data in a company is necessary for optimizing business processes effectively. Current analyses typically run either on business process execution data or on operational business data. Correlations among the separate data sets have to be found manually under big effort. However, to achieve a more informative analysis and to fully optimize a company’s business, an efficient consolidation of all major data sources is indispensable. Recent matching algorithms are insufficient for this task since they are restricted either to schema or to process matching. We present a new matching framework to combine process data models and operational data models (semi-)automatically for performing such a profound business analysis. We describe this approach and its basic matching rules as well as an experimental study that shows the achieved high recall and precision.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-37&engl=1} } @inproceedings {INPROC-2011-36, author = {Oliver Schiller and Benjamin Schiller and Andreas Brodt and Bernhard Mitschang}, title = {{Native support of multi-tenancy in RDBMS for software as a service}}, booktitle = {EDBT}, publisher = {ACM}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {117--128}, type = {Conference Paper}, month = {January}, year = {2011}, language = {English}, cr-category = {H.2.1 Database Management Logical Design, H.2 Database Management}, ee = {http://doi.acm.org/10.1145/1951365.1951382}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Software as a Service (SaaS) facilitates acquiring a huge number of small tenants by providing low service fees. To achieve low service fees, it is essential to reduce costs per tenant. For this, consolidating multiple tenants onto a single relational schema instance turned out beneficial because of low overheads per tenant and scalable man- ageability. This approach implements data isolation between ten- ants, per-tenant schema extension and further tenant-centric data management features in application logic. This is complex, dis- ables some optimization opportunities in the RDBMS and repre- sents a conceptual misstep with Separation of Concerns in mind. Therefore, we contribute first features of a RDBMS to support tenant-aware data management natively. We introduce tenants as first-class database objects and propose the concept of a tenant con- text to isolate a tenant from other tenants. We present a schema inheritance concept that allows sharing a core application schema among tenants while enabling schema extensions per tenant. Fi- nally, we evaluate a preliminary implementation of our approach.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-36&engl=1} } @inproceedings {INPROC-2011-27, author = {Nazario Cipriani and Carlos L{\"u}bbe and Oliver D{\"o}rler}, title = {{NexusDSEditor - Integrated Tool Support for the Data Stream Processing Middleware NexusDS}}, booktitle = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW), 14. Fachtagung des GI-Fachbereichs ``Datenbanken und Informationssysteme'' (DBIS), 2.-4.3.2011 in Kaiserslautern, Germany}, editor = {Theo H{\"a}rder and Wolfgang Lehner and Bernhard Mitschang and Harald Sch{\"o}ning and Holger Schwarz}, publisher = {Lecture Notes in Informatics (LNI)}, institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany}, series = {Gesellschaft f{\"u}r Informatik (GI)}, volume = {180}, pages = {714--717}, type = {Conference Paper}, month = {March}, year = {2011}, isbn = {978-3-88579-274-1}, language = {English}, cr-category = {D.2.6 Software Engineering Programming Environments, H.5.2 Information Interfaces and Presentation User Interfaces}, contact = {nazario.cipriani@ipvs.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {In this paper we present NexusDSEditor --- an integrated tool for the stream processing middleware NexusDS. NexusDSEditor is an extension module for the NexusEditor and supports developers with designing new streaming applications by providing an integrated tool for orchestrating stream query graphs, define the deployment of query graph fragments to execution nodes, and analyzing data streams. In this paper we demonstrate these single steps and show how NexusDSEditor supports developing streaming data applications for the NexusDS platform by hiding complexity and providing an intuitive user interface.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-27&engl=1} } @inproceedings {INPROC-2011-26, author = {Florian Niedermann and Sylvia Radesch{\"u}tz and Bernhard Mitschang}, title = {{Design-Time Process Optimization through Optimization Patterns and Process Model Matching}}, booktitle = {Proceedings of the 12th IEEE Conference on Commerce and Enterprise Computing (CEC)}, publisher = {IEEE Computer Society}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {48--55}, type = {Conference Paper}, month = {November}, year = {2011}, keywords = {Business Process Analytics; Business Process Design; Business Process Management; Business Process Optimization; Process Model Matching}, language = {English}, cr-category = {H.4.1 Office Automation}, ee = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5708392}, contact = {florian.niedermann@ipvs.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {The goal of process design is the construction of a process model that is a priori optimal w.r.t. the goal(s) of the business owning the process. Process design is therefore a major factor in determining the process performance and ultimately the success of a business. Despite this importance, the designed process is often less than optimal. This is due to two major challenges: First, since the design is an a priori ability, no actual execution data is available to provide the foundations for design decisions. Second, since modeling decision support is typically basic at best, the quality of the design largely depends on the ability of business analysts to make the ”right” design choices. To address these challenges, we present in this paper our deep Business Optimization Platform that enables (semi-) automated process optimization during process design based on actual execution data. Our platform achieves this task by matching new processes to existing processes stored in a repository based on similarity metrics and by using a set of formalized best-practice process optimization patterns.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-26&engl=1} } @inproceedings {INPROC-2011-25, author = {Florian Niedermann and Holger Schwarz}, title = {{Deep Business Optimization: Making Business Process Optimization Theory Work in Practice}}, booktitle = {Proceedings of the Conference on Business Process Modeling, Development and Support (BPMDS 2011)}, publisher = {Springer}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {1--10}, type = {Conference Paper}, month = {June}, year = {2011}, keywords = {Business Process Optimization, Optimization Techniques, Business Process Analytics, Data Mining, Tool Support}, language = {English}, cr-category = {H.4.1 Office Automation}, ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2011-25/INPROC-2011-25.pdf}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {The success of most of today's businesses is tied to the efficiency and effectiveness of their core processes. This importance has been recognized in research, leading to a wealth of sophisticated process optimization and analysis techniques. Their use in practice is, however, often limited as both the selection and the application of the appropriate techniques are challenging tasks. Hence, many techniques are not considered causing potentially significant opportunities of improvement not to be implemented. This paper proposes an approach to addressing this challenge using our deep Business Optimization Platform. By integrating a catalogue of formalized optimization techniques with data analysis and integration capabilities, it assists analysts both with the selection and the application of the most fitting optimization techniques for their specific situation. The paper presents both the concepts underlying this platform as well as its prototypical implementation.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-25&engl=1} } @inproceedings {INPROC-2011-24, author = {Florian Niedermann and Bernhard Maier and Sylvia Radesch{\"u}tz and Holger Schwarz and Bernhard Mitschang}, title = {{Automated Process Decision Making based on Integrated Source Data}}, booktitle = {Proceedings of the 14th International Conference on Business Information Systems (BIS 2011)}, editor = {Witold Abramowicz}, publisher = {Springer}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, series = {Lecture Notes in Business Information Processing}, pages = {1--10}, type = {Conference Paper}, month = {June}, year = {2011}, keywords = {Data Mining, Decision Automation, Data Integration, Business Process Management, Data-driven Processes}, language = {English}, cr-category = {H.4.1 Office Automation, H.2.8 Database Applications, H.5.2 Information Interfaces and Presentation User Interfaces}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {The success of most of today's businesses is tied to the efficiency and effectiveness of their core processes. Yet, two major challenges often prevent optimal processes: First, the analysis techniques applied during the optimization are inadequate and fail to include all relevant data sources. Second, the success depends on the abilities of the individual analysts to spot the right designs amongst a plethora of choices. Our deep Business Optimization Platform addresses these challenges through specialized data integration, analysis and optimization facilities. In this paper, we focus on how it uses formalized process optimization patterns for detecting and implementing process improvements.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-24&engl=1} } @inproceedings {INPROC-2011-23, author = {Florian Niedermann and Sylvia Radesch{\"u}tz and Bernhard Mitschang}, title = {{Business Process Optimization using Formalized Optimization Patterns}}, booktitle = {Proceedings of the 14th International Conference on Business Information Systems (BIS 2011)}, editor = {Witold Abramowicz}, publisher = {Springer}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {1--10}, type = {Conference Paper}, month = {June}, year = {2011}, keywords = {Business Process Management; Business Process Optimization}, language = {English}, cr-category = {H.4.1 Office Automation}, contact = {florian.niedermann@ipvs.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {The success of most of today's businesses is tied to the efficiency and effectiveness of their core processes. Yet, two major challenges often prevent optimal processes: First, the analysis techniques applied during the optimization are inadequate and fail to include all relevant data sources. Second, the success depends on the abilities of the individual analysts to spot the right designs amongst a plethora of choices. Our deep Business Optimization Platform addresses these challenges through specialized data integration, analysis and optimization facilities. In this paper, we focus on how it uses formalized process optimization patterns for detecting and implementing process improvements.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-23&engl=1} } @inproceedings {INPROC-2011-20, author = {Carlos L{\"u}bbe and Andreas Brodt and Nazario Cipriani and Matthias Gro{\ss}mann and Bernhard Mitschang}, title = {{DiSCO: A Distributed Semantic Cache Overlay for Location-based Services}}, booktitle = {Proceedings of the 2011 Twelfth International Conference on Mobile Data Management}, address = {Washington, DC, USA}, publisher = {IEEE Computer Society}, institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany}, pages = {1--10}, type = {Conference Paper}, month = {January}, year = {2011}, keywords = {peer-to-peer; semantic caching}, language = {German}, cr-category = {C.2.4 Distributed Systems, H.2.4 Database Management Systems}, contact = {carlos.luebbe@ipvs.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Location-based services (LBS) have gained tremendous popularity with millions of simultaneous users daily. LBS handle very large data volumes and face enormous query loads. Both the data and the queries possess high locality: spatial data is distributed very unevenly around the globe, query load is different throughout the day, and users often search for similar things in the same places. This causes high load peaks at the data tier of LBS, which may seriously degrade performance. To cope with these load peaks, we present DiSCO, a distributed semantic cache overlay for LBS. DiSCO exploits the spatial, temporal and semantic locality in the queries of LBS and distributes frequently accessed data over many nodes. Based on the Content-Addressable Network (CAN) peer-to-peer approach, DiSCO achieves high scalability by partitioning data using spatial proximity. Our evaluation shows that DiSCO significantly reduces queries to the underlying data tier.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-20&engl=1} } @inproceedings {INPROC-2011-17, author = {Christoph Stach and Andreas Brodt}, title = {{– vHike – A Dynamic Ride-sharing Service for Smartphones}}, booktitle = {Proceedings of the 12th international conference on Mobile data management}, address = {Lule{\aa}, Sweden}, publisher = {ACM}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {1--4}, type = {Conference Paper}, month = {June}, year = {2011}, keywords = {ride-sharing; trust; security; location-based.}, language = {English}, cr-category = {K.4 Computers and Society}, contact = {Senden Sie eine E-Mail an christoph.stach@ipvs.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {In times of lacking natural resources and increasing environmental pollution at the same time, modern resource efficient kinds of personal transportation have to be considered. Ride-sharing is maybe one of the most economical ways to avouch permanent mobility without losing too much comfort. However, especially dynamic ride-sharing is laden with many resistances including a lack of security and a heavy scheduling and coordinating burden. Hence this paper introduces an implementation of a system for dynamic ride-sharing called vHike which should eliminate these barriers. With our demonstrator every interested participant may test whether or not such a system can be viable and effective.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-17&engl=1} } @inproceedings {INPROC-2011-16, author = {Andreas Brodt and Oliver Schiller and Sailesh Sathish and Bernhard Mitschang}, title = {{A mobile data management architecture for interoperability of resource and context data}}, booktitle = {Proceedings of the 2011 Twelveth International Conference on Mobile Data Management}, publisher = {IEEE Computer Society}, institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany}, pages = {1--6}, type = {Conference Paper}, month = {June}, year = {2011}, language = {English}, cr-category = {H.3.4 Information Storage and Retrieval Systems and Software, H.3.5 Online Information Services, H.2.4 Database Management Systems}, ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2011-16/INPROC-2011-16.pdf}, contact = {brodt@ipvs.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Mobile devices have become general-purpose computers that are equipped with sensors, constantly access the internet, and almost always accompany the user. Consequently, devices manage many different kinds of data about the user's life and context. There is considerable overlap in this data, as different applications handle similar data domains. Applications often keep this data in separated data silos. Web applications, which manage large amounts of personal data, hardly share this data with other applications at all. This lack of interoperability creates redundancy and impacts usability of mobile devices. We present a data management architecture for mobile devices to support interoperability between applications, devices and web applications at the data management level. We propose a central on-device repository for applications to share resource and context data in an integrated, extensible data model which uses semantic web technologies and supports location data. A web browser interface shares data with web applications, as controlled by a general security model.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-16&engl=1} } @inproceedings {INPROC-2011-07, author = {Peter Reimann and Michael Reiter and Holger Schwarz and Dimka Karastoyanova and Frank Leymann}, title = {{SIMPL - A Framework for Accessing External Data in Simulation Workflows}}, booktitle = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2011), 14. Fachtagung des GI-Fachbereichs „Datenbanken und Informationssysteme“ (DBIS), Proceedings, 02.-04. M{\"a}rz 2011, Kaiserslautern, Germany}, editor = {Gesellschaft f{\"u}r Informatik (GI)}, publisher = {Lecture Notes in Informatics (LNI)}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, series = {Series of the Gesellschaft f{\"u}r Informatik (GI)}, volume = {180}, pages = {534--553}, type = {Conference Paper}, month = {March}, year = {2011}, isbn = {978-3-88579-274-1}, keywords = {Data Provisioning; Workflow; Scientific Workflow; Simulation Workflow; BPEL; WS-BPEL; SIMPL}, language = {English}, cr-category = {H.2.8 Database Applications, H.4.1 Office Automation}, contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems; University of Stuttgart, Institute of Architecture of Application Systems}, abstract = {Adequate data management and data provisioning are among the most important topics to cope with the information explosion intrinsically associated with simulation applications. Today, data exchange with and between simulation applications is mainly accomplished in a file-style manner. These files show proprietary formats and have to be transformed according to the specific needs of simulation applications. Lots of effort has to be spent to find appropriate data sources and to specify and implement data transformations. In this paper, we present SIMPL – an extensible framework that provides a generic and consolidated abstraction for data management and data provisioning in simulation workflows. We introduce extensions to workflow languages and show how they are used to model the data provisioning for simulation workflows based on data management patterns. Furthermore, we show how the framework supports a uniform access to arbitrary external data in such workflows. This removes the burden from engineers and scientists to specify low-level details of data management for their simulation applications and thus boosts their productivity.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-07&engl=1} } @inproceedings {INPROC-2011-06, author = {Christoph Stach}, title = {{Saving time, money and the environment - vHike a dynamic ride-sharing service for mobile devices}}, booktitle = {Work in Progress workshop at PerCom 2011 (WIP of PerCom 2011)}, address = {Seattle, USA}, publisher = {IEEE}, institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany}, pages = {1--4}, type = {Conference Paper}, month = {March}, year = {2011}, keywords = {ride-sharing; trust; security; location-based}, language = {English}, cr-category = {K.4 Computers and Society}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {In times of increasing traffic-related problems, such as air-pollution or traffic jams, ride-sharing is one of the most environmentally friendly and pleasantest ways to travel. The many benefits are offset by a multitude of prejudices and fears, including security concerns and a heavy scheduling and coordinating burden. For this reason this paper introduces vHike an easy-to-use management system for dynamic ridesharing running on modern Smartphones. By the use of techniques well-known from Web 2.0 social networks the threats and social discomfort emanated by ride-sharing is mitigated. With vHike we want to show that a proper designed social dynamic ride-sharing system can be feasible and viable.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-06&engl=1} } @article {ART-2011-19, author = {Bernhard Mitschang and Holger Schwarz}, title = {{Der Lehrstuhl ”Datenbanken und Informationssysteme” an der Universit{\"a}t Stuttgart stellt sich vor}}, journal = {Datenbank-Spektrum}, publisher = {Springer}, volume = {11}, number = {3}, pages = {213--217}, type = {Article in Journal}, month = {November}, year = {2011}, language = {German}, cr-category = {H.2 Database Management}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {In diesem Beitrag stellen wir den Lehrstuhl f{\"u}r Datenbanken und Informationssysteme der Universit{\"a}t Stuttgart unter der Leitung von Prof. Dr. Bernhard Mitschang vor. Nach einem {\"U}berblick {\"u}ber die Forschungsschwerpunkte des Lehrstuhls gehen wir auf ausgew{\"a}hlte aktuelle Forschungsprojekte ein und erl{\"a}utern die Beteiligung an der Lehre in Bachelor- und Masterstudieng{\"a}ngen.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-19&engl=1} } @article {ART-2011-14, author = {Peter Reimann and Holger Schwarz and Bernhard Mitschang}, title = {{Design, Implementation, and Evaluation of a Tight Integration of Database and Workflow Engines}}, journal = {Journal of Information and Data Management}, editor = {Alberto H. F. Laender and Mirella M. Moro}, publisher = {SBC - Brazilian Computer Society}, volume = {2}, number = {3}, pages = {353--368}, type = {Article in Journal}, month = {October}, year = {2011}, issn = {2178-7107}, keywords = {Data-Intensive Workflow; Improved Local Data Processing; Scientific Workflow; Simulation Workflow}, language = {English}, cr-category = {D.2.11 Software Engineering Software Architectures, H.2.8 Database Applications, H.4.1 Office Automation}, contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Accessing and processing huge amounts of heterogeneous and distributed data are some of the major challenges of data-intensive workflows. Traditionally, the descriptions of such workflows focus on their data flow. Nevertheless, control-flow-oriented workflow languages are increasingly adapted to the needs of data-intensive workflows. This provides a common level of abstraction for both data-intensive workflows and classical orchestration workflows, e.g., business workflows, which then enables a comprehensive optimization across all workflows. However, the problem still remains that workflows described in control-flow-oriented languages tend to be less efficient for data-intensive processes compared to specialized data-flow-oriented approaches. In this paper, we propose a new kind of optimization targeted at data-intensive workflows that are described in control-flow-oriented languages. We show how to improve efficiency of such workflows by introducing various techniques that partition the local data processing tasks to be performed during workflow execution in an improved way. These data processing tasks are either assigned to the workflow engine or to the tightly integrated local database engine. We evaluate the effectiveness of these techniques by means of various test scenarios.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-14&engl=1} } @article {ART-2011-12, author = {Jorge Minguez and Stefan Silcher and Philipp Riffelmacher and Bernhard Mitschang}, title = {{A Service Bus Architecture for Application Integration in the Planning and Production Phases of a Product Lifecycle}}, journal = {International Journal of Systems and Service-Oriented Engineering}, publisher = {IGI Global}, volume = {2}, number = {2}, pages = {21--36}, type = {Article in Journal}, month = {June}, year = {2011}, issn = {1947-3052}, keywords = {Manufacturing Service Bus; Service-oriented Architecture; Product Lifecycle Management; SOA; MSB; PLM}, language = {English}, cr-category = {D.2.11 Software Engineering Software Architectures, D.2.13 Software Engineering Reusable Software}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Constantly changing business conditions require a high level of flexibility in business processes as well as an adaptive and fully interoperable IT infrastructure in today’s manufacturing environments. The lack of flexibility prevents manufacturing companies from improving their responsiveness and adapting their workflows to turbulent scenarios. In order to achieve highly flexible and adaptive workflows, information systems in digital factories and shop floors need to be integrated. The most challenging problem in such manufacturing environments is the high heterogeneity of the IT landscape, where the integration of legacy systems and information silos has led to chaotic architectures over the last two decades. In order to overcome this issue, the authors present a flexible integration platform that allows a loose coupling of distributed services in event-driven manufacturing environments. The proposed approach enables a flexible communication between digital factory and shop floor components by introducing a service bus architecture. This solution integrates an application-independent canonical message format for manufacturing events, content-based routing and transformation services as well as event processing workflows.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-12&engl=1} } @article {ART-2011-07, author = {Holger Schwarz}, title = {{Generierung des Datenzugriffs in Anwendungsprogrammen: Anwendungsbereiche und Implementierungstechniken}}, journal = {Datenbank Spektrum}, address = {Heidelberg}, publisher = {Springer}, volume = {11}, number = {1}, pages = {5--14}, type = {Article in Journal}, month = {April}, year = {2011}, language = {German}, cr-category = {H.4 Information Systems Applications}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {Datenzugriffe auf externe und heterogene Datenbest{\"a}nde sind ein grundlegender Bestandteil von Anwendungsprogrammen in ganz unterschiedlichen Anwendungsbereichen. Vielfach k{\"o}nnen diese Datenzugriffe nicht {\"u}ber statisch eingebettete Anweisungen realisiert werden, sondern m{\"u}ssen dynamisch generiert werden. In diesem Beitrag wird das Spektrum relevanter Anwendungsbereiche vorgestellt. Ausgehend von einzelnen Systembeispielen werden wichtige Aspekte anfragegenerierender Systeme verallgemeinert. Hierzu wird eine Systemklassifikation vorgestellt und die Bedeutung der Klassifikation insbesondere f{\"u}r Optimierungsaspekte erl{\"a}utert. Ferner werden drei grundlegende Implementierungskonzepte f{\"u}r anfragegenerierende Systeme vorgestellt und deren Eignung f{\"u}r einzelne Anwendungsklassen diskutiert.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-07&engl=1} } @article {ART-2011-04, author = {Jorge Minguez and Philipp Riffelmacher and Bernhard Mitschang and Engelbert Westk{\"a}mper}, title = {{Servicebasierte Integration von Produktionsanwendungen}}, journal = {Werkstattstechnik online}, publisher = {Springer-VDI Verlag}, volume = {3-2011}, pages = {128--133}, type = {Article in Journal}, month = {March}, year = {2011}, keywords = {service-oriented architecture; SOA; ESB; manufacturing; produktion; lernfabrik; produktionsanwendungen; servicebasierte integration}, language = {German}, cr-category = {D.2.11 Software Engineering Software Architectures, D.2.13 Software Engineering Reusable Software}, ee = {http://www.technikwissen.de/wt/currentarticle.php?data[article_id]=59574}, contact = {jorge.minguez@gsame.uni-stuttgart.de}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {In einem modernen Produktionsumfeld soll es m{\"o}glich sein, informationstechnische Prozesse an die sich zunehmend {\"a}ndernden Gesch{\"a}ftsbedingungen anzupassen. Um eine schnelle Anpassung zu realisieren, ist eine flexible Integration unterschiedlicher Informationssysteme erforderlich, da die Informationsfl{\"u}sse durch system{\"u}bergreifende Datenbearbeitungsprozesse gesteuert werden. Die heterogene Landschaft der digitalen Werkzeuge stellt dabei eine enorme Herausforderung dar. Der vorgestellte servicebasierte Ansatz adressiert diese Problematik.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-04&engl=1} } @article {ART-2011-03, author = {Nazario Cipriani and Matthias Wieland and Matthias Grossmann and Daniela Nicklas}, title = {{Tool support for the design and management of context models}}, journal = {Information Systems}, editor = {Gottfried Vossen and Tadeusz Morzy}, address = {Oxford, UK, UK}, publisher = {Elsevier Science Ltd.}, volume = {36}, number = {1}, pages = {99--114}, type = {Article in Journal}, month = {March}, year = {2011}, isbn = {0306-4379}, language = {English}, cr-category = {H.2.4 Database Management Systems}, ee = {http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235646%232011%23999639998%232475749%23FLA%23&_cdi=5646&_pubType=J&_auth=y&_acct=C000022964&_version=1&_urlVersion=0&_userid=479010&md5=90fcaef40ac5285da3d69e894c214388, http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6V0G-50GMMMG-4-1K&_cdi=5646&_user=479010&_pii=S0306437910000669&_origin=browse&_zone=rslt_list_item&_coverDate=03%2F31%2F2011&_sk=999639998&wchp=dGLbVtb-zSkzk&md5=aac6f0561c2464d528bcce117970acff&ie=/sdarticle.pdf}, department = {University of Stuttgart, Institute of Architecture of Application Systems; University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems}, abstract = {A central task in the development of context-aware applications is the modeling and management of complex context information. In this paper, we present the NexusEditor, which can ease this task by providing a graphical user interface to design schemas for spatial and technical context models, interactively create queries, send them to a server and visualize the results. One main contribution is to show how schema awareness can improve such a tool: The NexusEditor dynamically parses the underlying data model and provides additional syntactic checks, semantic checks, and short-cuts based on the schema information. Furthermore, the tool helps to design new schema definitions based on the existing ones, which is crucial for an iterative and user-centric development of context-aware applications. Finally, it provides interfaces to existing information spaces and visualization tools for spatial data like GoogleEarth.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-03&engl=1} } @proceedings {PROC-2011-01, editor = {Theo H{\"a}rder and Wolfgang Lehner and Bernhard Mitschang and Harald Sch{\"o}ning and Holger Schwarz}, title = {{Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2011)}}, publisher = {GI}, institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany}, pages = {760}, type = {Proceedings}, month = {February}, year = {2011}, isbn = {978-3-88579-274-1}, language = {German}, cr-category = {H.2 Database Management}, department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems; University of Stuttgart, Institute of Parallel and Distributed Systems}, abstract = {The ”BTW” is a biennial conference series focusing on a broad range of topics addressing database management for Business, Technology, and Web. BTW 2011 as its 14th event took place in Kaiserslautern from March 2nd to 4th. This volume contains 24 long and 6 short papers selected for presentation at the conference, 9 industrial contributions, 3 papers or abstracts for the invited talks, 12 demonstration proposals, a panel description, and a paper written by the winner of the dissertation award. The subject areas include core database technology such as query optimization and indexing, DBMS-related prediction models, data streams, processing of large data sets, Web-based information extraction, benchmarking and simulation, and others.}, url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=PROC-2011-01&engl=1} }