Determining the QoS (quality of service) of composite Web services is of high importance for both service providers and service consumers. Heterogeneity of service descriptions, however, often hinders the aggregation of QoS parameters. We propose ontology-based QoS aggregation that integrates the semantics of QoS parameters and their aggregation into the overall aggregation process. The contrib...

Due to the decentralised and autonomous architecture of the Web of Data, data replication and local deployment of SPARQL endpoints is inevitable. Nowadays, it is common to have multiple copies of the same dataset accessible by various SPARQL endpoints, thus leading to the problem of selecting optimal data source for a user query based on data properties and requirements of the user or the appli...

Abstract: This paper presents an QoS (quality of service) based control system of teleoperation via the Internet. Quality of service on the Internet refers to a set of quality requirements on the performance of the data transmission necessary to achieve the required functionality of an application. The quality of data transmission via the Internet is measured or reflected by a set of QoS parame...

User Services Assistant (USA) is a novel reactive QoS agent that provides facilities for managing user to user QoS in Internet environments. By being reactive, it overcomes the problems associated with QoS management schemes that have been proposed to date, such as the mapping of the QoS parameters to end system parameters, and pre-determining the optimum way of degrading/upgrading the QoS. How...

Dynamic reconfiguration has been widely recognized as an effective approach to deal with the increasing complexity of dynamically adaptive systems. One of the main challenges in such systems is to provide guarantees about the required runtime quality of service (QoS) attributes, such as performance, reliability, etc. Therefore, it is of paramount importance to make these systems able to monitor...

The paper presents an end-to-end Quality of Service (QoS) architecture suitable for IP communications scenarios that include UMTS access networks. The rationale for the architecture is justified and its main features are described, notably the QoS management functions on the terminal equipment, the mapping between IP and UMTS QoS parameters and the negotiation of these parameters.