No abstract

This paper describes key aspects of remote service invocation in federations of OSGi containers. It refers to the OSGi Remote Service Admin specification and describes its efficient implementation over messageoriented middleware. Scalability problems of several different approaches to implementation are identified, and a solution in a form of innovative Remote Service Admin model extension is proposed. The extension, named On-demand Remote Service Admin, is analyzed and validated in the context of a motivating scenario. Validation includes performance and scalability evaluation, which confirms that all assumed requirements have been satisfied by the constructed prototype. Finally, the presented research is compared with related works.

No abstract

The paper proposes a methodology and a toolbased support for the development of semantic services in ambient-assisted living (AAL)-oriented assistive environments. A review of existing approaches in this area is conducted. The review covers a variety of AAL platforms from which universAAL has been chosen for the experimental implementation. The paper presented the iterative development methodology of service semantics, which facilitates the efficient creation of error-free services in AAL platforms. The features needed for the realization of the methodology are implemented as a universAAL platform extension named the annotation-based semantic enrichment. The proposed approach is assessed in the context of a sample scenario in which the services promoting universal access for elderly people or otherwise impaired persons are developed. The assessment results are used to highlight the added value of the presented work and to identify potential areas of future improvement.