A Ubiquitous System Using Semantic Knowledge in Dynamic Service Integration

Abstract

The paper presents a ubiquitous system that uses semantic information to manage dynamic changes in system elements. We design the system using the Context-Controller-Action architecture that covers the main parts of ubiquitous environments, including: environment devices (such as sensors and actuators), contexts and actions, all of which may be dynamically configured during system operation. A graphical user interface for the system is supplied, which enables non-expert users to perform changes in system configuration. Internally, semantic information is used throughout the system to define a common language between devices, contexts and services. A Web services interface is used in services that handle environment devices to support their integration with the system regardless of internally used communication protocols. The architecture was implemented as a framework for developing and running applications in ubiquitous environments. We integrated a number of devices in the framework, including, RFID sensors, digital displays, cameras, electronic door locks and others. We also defined exemplary contexts and actions in the environment.