Service interaction manifest itself as an unexpected behaviour of multiple services used together either simultaneously or in sequence. The paper describes a policy based approach to web service interaction management. Parlay X web services for call control, mobility, user interaction and policy management are studied. Web service behaviour is described as a set of policy rules. Rules are gener...

Web services are an emerging technology that provides a flexible platform for web interaction. We evaluate Web service performance of handheld resource-constrained clients using different wireless technologies. Due to the usage of XML, message sizes in Web services are larger than in traditional web technologies and therefore, compression of Web service messages is attractive; as our experiment...

This paper presents the implementation of the CU VOCAL Web service, one of the first Chinese text-to-speech synthesis Web services. The CU VOCAL Web service can be easily integrated with other Web services to develop innovative Web-mediated applications. We have developed a novel automatic voice alert system in the stocks domain by integrating CU VOCAL and several other Web services. This syste...

Many providers offer Web APIs that expose their services to an ever increasing number of mobile and desktop applications. However, all interactions have to be explicitly programmed by humans. Automated composition of those Web APIs could make it considerably easier to integrate different services from different providers. In this paper, we therefore present an automated Web API composition meth...

A web-based dispatching system for autonomous mobile service robots is presented. The system is composed of an extensible number of physical and software components. They represent and control objects like robots, doors, cameras and elevators or software components like a job scheduler and a database manager. Components communicate via radio link and Ethernet. Autonomously operating components ...

Digital music distribution, the success of MP3 and the actual activities concerning the semantic web of music require for convenient music information retrieval. In this paper we will give an overview about the concepts behind our “super-convenience” approach for MIR. By using natural language as input for humanoriented queries to large-scale music collections we were able to address the needs ...

This paper presents an empirical task-based user evaluation, which was carried out for the purpose of assessing the subjective QoS of a mobile multimedia web service in a real multi-access network environment comprising of WLAN and GPRS networks and automatic mobility management with Mobile IP. Subjective quality ratings were collected from 20 test users to obtain a distribution representing th...

Internet services in distributive organization are normally built on an open network environment. In the environment internet service provisioning cannot be expected executing in a single close organization [1]. Identity management in cross-organization becomes an issue for handling Internet service and distributive business process. The “identity” in cross-organization web service is defined a...