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Persistence, Scalability, transactions - database Mechanisms for Mobile Applications 2003

作者： Nagi, Khaled König-Ries, Birgitta Computer Science Department Faculty of Engineering Alexandria University El-Shatby Alexandria Egypt Institute for Program Structures Data Organization Universität Karlsruhe KarlsruheD-76128 Germany

ISBN: (纸本)3885793725

the wide availability of mobile devices equipped with wireless communication devices paves the way for building highly dynamic communities of ad-hoc networks. For an asynchronous service discovery in this environment, we suggest the use of mobile agents. Here, we concentrate on file sharing and exchanging services. We adopt a new asynchronous approach for discovering and locating these files, since the availability of files in this particular domain will change significantly over time when nodes constantly join and leave the network. In this paper, we present a typical application scenario, highlight the main components of the system architecture and discuss the technical challenges facing us while trying to port main infrastructural features of traditional database management systems to our mobile light-weight software agents. © 2003 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Mobile agents

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Service rings - a semantic overlay for service discovery in ad hoc networks

Service rings - a semantic overlay for service discovery in ...

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International Workshop on database and Expert Systems Applications

作者： M. Klein B. Konig-Ries P. Obreiter Institute for Program Structures and Data Organisation Universität Karlsruhe Karlsruhe Germany

Mobile devices are able to spontaneously form highly dynamic ad hoc networks allowing for communication even when no infrastructure exists. Ideally, these networks enable the participating devices to share resources and services, thus overcoming the often severe limitations of the individual devices' capabilities. In order to make this possible, powerful semantic service trading is needed. In this paper, we propose a semantic overlay of hierarchical service rings to achieve this goal. In contrast to existing approaches this method is adapted to the specific characteristics of ad hoc networks.

关键词： Intelligent networks Ad hoc networks Protocols Mobile ad hoc networks databases IP networks Web and internet services Peer to peer computing Routing Mobile communication

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Benchmarking and Robust Multi-Agent-Based Production Planning and Control

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IFAC Proceedings Volumes 2003年第3期36卷 249-254页

作者： Daniel Frey Jens Nimis Heinz Wörn Peter Lockemann Institute for Process Control and Robotics Universität Karlsruhe (TH) Engler-Bunte-Ring 8 76131 Karlsruhe Germany ffrey Tel.+49 721 608-4246 Fax. ++49 72 1 608-7141 Institute for Program Structures and Data Organization Universität Karlsruhe (TH) Am Fasanengarten 5 76128 Karlsruhe Germany Tel. ++49 721 608-7337 Fax. ++49 721 608-7343

Multi-agent systems (MAS) offer new perspectives compared to conventional, centrally organised architectures in the scope of production planning and control. they are expected to be more flexible and robust while dealing with a turbulent production environment and disturbances. In this paper, a MAS is developed and compared to an Operations Research Job-Shop algorithm using a simulation-based benchmarking scenario. Environmental constraints for a successful application of MAS are identified and classified. Furthermore, the topic of MAS robustness is addressed by applying database technologies on the basis of transactions.

关键词： Modelling Simulation Production Planning Scheduling Flexibility Reliability Multi-agent Approach

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Semi-automatic wrapper generation and adaption: Living with heterogeneity in a market environment 4

Semi-automatic wrapper generation and adaption: Living with ...

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4th International Conference on Enterprise Information Systems, ICEIS 2002

作者： Christoffel, Michael Schmitt, Bethina Schneider, Jürgen Institute for Program Structures and Data Organization Universität Karlsruhe Karlsruhe Germany

ISBN: (纸本)9729805067

the success of the Internet as a medium for the supply and commerce of various kinds of goods and services leads to a fast growing number of autonomous and heterogeneous providers that offer and sell goods and services electronically. the new market structures have already entered all kinds of markets. Approaches for market infrastructures usually try to cope with the heterogeneity of the providers by special wrapper components, which translate between the native protocols of the providers and the protocol of the market infrastructure. Enforcing a special interface to the provider limits their independence. Moreover, requirements such as a direct access to the internal business logic and databases of the providers or fix templates for internal data structures are not suitable to establish a real open electronic market. A solution is the limitation of the access to the existing Web interface of the provider. this solution keeps the independence of the providers without burdening them additional work. However, for efficiency reasons, it keeps necessary to tailor a wrapper for each provider. What comes more, each change in the provider or its Web representation forces the modification of the existing wrapper or even the development of a new wrapper. In this paper, we present an approach for a wrapper for complex Web interfaces, which can easily be adapted to any provider just by adding a source description file. A tool allows the construction and modification of source descriptions without expert knowledge. Common changes in the Web representation can be detected and comprehended automatically. the presented approach has been applied to the market of scientific literature.

关键词： Open markets Provider integration Web interfaces Wrapper generation

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Decision support with imprecise data for consumers 1st

Decision support with imprecise data for consumers

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1st International Conference on Computing in an Imperfect World, Soft-Ware 2002

作者： Luk Á Cs, Gergely Universität Karlsruhe Institute for Program Structures and Data Organization Am Fasanengarten 5 Karlsruhe76128 Germany

ISBN: (纸本)354043481X

Only imperfect data is available in many decision situations, which therefore plays a key role in the decision theory of economic science. It is also of key interest in computer science, among others when integrating autonomous information systems: the information in one system is often imperfect from the view of another system. the case study for the present work combines the two issues: the goal of the information integration is to provide decision support for consumers, the public. By the integration of an electronic timetable for public transport with a geographically referenced database, for example, with rental apartments, it is possible to choose alternatives, for example, rental apartments from the database that have a good transport connection to a given location. However, if the geographic references in the database are not sufficiently detailed, the quality of the public transport connections can only be characterized imprecisely. this work focuses on two issues: the representation of imprecise data and the sort operation for imprecise data. the proposed representation combines intervals and imprecise probabilities. When the imprecise data is only used for decision making with the Bernoulli-principle, a more compact representation is possible without restricting the expressive power. the key operation for decision making, the sorting of imprecise data, is discussed in detail. the new sort operation is based on so called π-cuts, and is particularly suitable for consumer decision support. © Springer-Verlag Berlin Heidelberg 2002.

关键词： database systems

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Decision support under imperfections in electronic commerce

Decision support under imperfections in electronic commerce

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International Workshop on database and Expert Systems Applications

作者： G. Lukacs Institute for Program Structures and Data Organization Universität Karlsruhe Karlsruhe Germany

the selection of products and services is a central issue in electronic commerce. Available data is often not sufficient to allow a precise evaluation and user preferences are usually vague. In this paper, a model for deciding under imperfect information is presented. the decision model handles two types of imperfections: imprecisions on the side of the alternatives and vagueness in the preferences of the users. Incomplete description of the alternatives may result in imprecisions in the evaluation of their features. the decision model provides a framework to reduce these imprecisions by completing information from external sources. Besides, fuzzy query conditions allow users to express vague preferences. A scenario illustrates the use of the decision model where the goal is to select a rental apartment from classified advertisements with respect to its availability by public transport.

关键词： Electronic commerce Information retrieval Electronic mail Investments Internet Power generation economics Food products Diabetes Packaging Energy efficiency

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towards an interactive query environment for a multi-attribute decision model with imprecise data and vague query conditions

Towards an interactive query environment for a multi-attribu...

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International Workshop on database and Expert Systems Applications

作者： G. Lukacs Institute for Program Structures and Data Organization Universität Karlsruhe Karlsruhe Germany

A multi-attribute decision model aiming at the selection of an efficient set of alternatives is presented. the major challenge is that the alternatives are not perfectly known, i.e., the associated values may be imprecise. Furthermore, for improved user friendliness, vague query conditions are allowed. Imprecise scores are described by probability distributions, vague query conditions by fuzzy predicates. the philosophy of the presented approach is to create an environment similar to the multidimensional spreadsheet front-end of data warehouses, in which the user can interactively discover the imperfect answers. In particular, numeric measures that allow an aggregated view of alternatives are defined. A geographic information retrieval scenario demonstrates the use of the decision model.

关键词： Information systems Probability distribution Multidimensional systems data warehouses Particle measurements Information retrieval Decision making Decision support systems Internet Environmental economics

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Managed Software Evolution 1

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1000年

作者： Ralf Reussner Jan Keim Michael Goedicke Wilhelm Hasselbring Birgit Vogel-Heuser Lukas Märtin

ISBN: (数字)9783030134990

ISBN: (纸本)9783030134983;9783030135010

this open access book presents the outcomes of the “Design for Future – Managed Software Evolution” priority program 1593, which was launched by the German Research Foundation (“Deutsche Forschungsgemeinschaft (DFG)”) to develop new approaches to software engineering with a specific focus on long-lived software systems. the different lifecycles of software and hardware platforms lead to interoperability problems in such systems. Instead of separating the development, adaptation and evolution of software and its platforms, as well as aspects like operation, monitoring and maintenance, they should all be integrated into one overarching process.;Accordingly, the book is split into three major parts, the first of which includes an introduction to the nature of software evolution, followed by an overview of the specific challenges and a general introduction to the case studies used in the project. the second part of the book consists of the main chapters on knowledge carrying software, and cover tacit knowledge in software evolution, continuous design decision support, model-based round-trip engineering for software product lines, performance analysis strategies, maintaining security in software evolution, learning from evolution for evolution, and formal verification of evolutionary changes. In turn, the last part of the book presents key findings and spin-offs. the individual chapters there describe various case studies, along with their benefits, deliverables and the respective lessons learned. An overview of future research topics rounds out the coverage.;the book was mainly written for scientific researchers and advanced professionals with an academic background. they will benefit from its comprehensive treatment of various topics related to problems that are now gaining in importance, given the higher costs for maintenance and evolution in comparison to the initial development, and the fact that today, most software is not developed from scratch, but as part of a c

关键词： Software Engineering Software Management Management of Computing and Information Systems theory of Computation

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Ernst Denert Award for Software Engineering 2020 1

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1000年

作者： Michael Felderer Wilhelm Hasselbring Heiko Koziolek Florian Matthes Lutz Prechelt Ralf Reussner Bernhard Rumpe Ina Schaefer

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Ernst Denert Award for Software Engineering 2019 1

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1000年

作者： Michael Felderer Wilhelm Hasselbring Heiko Koziolek Florian Matthes Lutz Prechelt Ralf Reussner Bernhard Rumpe Ina Schaefer

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