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,...
详细信息
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 a...
详细信息
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 contrastto existing approaches this method is adapted to the specific characteristics of ad hoc networks.
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 deal...
详细信息
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.
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 service...
详细信息
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 marketstructures 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 datastructures 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.
Only imperfectdata 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 ...
详细信息
the selection of products and services is a central issue in electronic commerce. Available data is often not sufficientto allow a precise evaluation and user preferences are usually vague. In this paper, a model for...
详细信息
the selection of products and services is a central issue in electronic commerce. Available data is often not sufficientto 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 respectto its availability by public transport.
A multi-attribute decision model aiming atthe selection of an efficient set of alternatives is presented. the major challenge is thatthe alternatives are not perfectly known, i.e., the associated values may be impre...
详细信息
A multi-attribute decision model aiming atthe selection of an efficient set of alternatives is presented. the major challenge is thatthe 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.
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 (D...
详细信息
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 outthe 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 factthattoday, most software is not developed from scratch, but as part of a c
暂无评论