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The amount of data within the Linking Open Data (LOD) cloud is steadily increasing and resembles a rich source of information. Since Context-aware Services (CAS) can highly benefit from background information, e.g., about the environment of a user, it makes sense to leverage that enormous amount of data already present in the LOD cloud to enhance the quality of these services. Within this work, the...
Context aware computing as well as wearable and ubiquitous computing often attain with pattern recognition on incoming sensor data. Recognizing more (useful) contexts requires more information about the context, and thus more sensors and better recognition algorithms. In order to enable logic inference on incoming data, the proposed work assumes that incoming data are represented by means of semantic...
Context aware computing attains environments monitoring by means of sensors in order to provide relevant information or services according to the identified context. Nowadays, ad hoc wireless sensor networks for medical purposes are playing an increasing role within healthcare. Specifically, Body Sensor Networks (BSN) and Wireless Sensor Network, are being designed for prophylactic and follow-up monitoring...
One of the most important points in context-aware computing is to build a reasonable context model. Currently, many models were not built in a common structure. It is hard to build other models depending on the existing ones. In this paper, we build a common ontology-based context model with Web Ontology Language (OWL), which provides an efficient and convenient way of ontology-building by adding...
In ubiquitous-city, a middleware is essential since various kinds of unified services are required in many different applications and flexibility of service is required. It should dynamically discover and invoke services to exploit the flexibility and the power of the middleware and the service discovery is very important in the middleware. In this paper, we present a mechanism and elements of semantic...
In pervasive computing environment, service discovery plays an important role for automatically locating and executing the most suitable services according to related contextual information to fulfill user requirements. Current service discovery mechanisms rarely take context into consideration, leading to poor user experiences. In this paper, we propose an approach to service discovery that makes...
Context awareness is one of the most fundamental issues in pervasive computing. In this paper, an ontology based context model is proposed, which defines "high-level" context ontology to provide basic concepts for sharing and managing context information. Our context model takes QoS and Security supporting into account. In addition, a context aware architecture based on semantic web service...
Service-oriented architecture (SOA) is a new paradigm, where it is imperative to automatically adapt to the changing context in the environment. This paper applies context awareness to service-oriented architecture to build reusable, adaptable, spontaneous and flexible context-awareness systems. We develop an ontology based context model, and domain-analyst oriented context reasoning rules, which...
The aim of service discovery is to discover services based on preferences given by service consumers. Many approaches are using keyword based syntactic methods and recent approaches are using semantic Web technology to enhance service discovery. Traditional service discovery mechanism acts like a black box which processes input and gives output. Results of service discovery are not based on current...
The increasing popularity of personal wireless devices has raised new demands for the efficient discovery of heterogeneous devices and services in pervasive environments. The existing syntactic level service matching mechanisms such as Jini, UPnP, etc., are limited to syntactic comparisons based on attributes or interfaces. In order to overcome the limitations in these approaches, there has been an...
Context awareness in Web services is gaining momentum. Since it is not a trivial task, it suffers from lack of a general solution. In this paper, we introduce a novel approach for context-aware semantic Web services which is applicable for any environment. It is established based on composition of context provider Web services and other context-aware semantic Web services. In addition, an extended...
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