Martin Wibbels

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The web has evolved from the HTML-based repositories of text and images towards the current web services and semantic web developments. Web services are believed to help the integration of diverse applications while the semantic web promises to increase the “intelligence” of the web, enabling richer discovery, data integration, navigation and automation of(More)
One of the challenges in ubiquitous computing is that of mobility, which typically requires interaction between intelligent environments in different domains of administration. We present a highly distributed and collaborative system that enables context-aware applications to obtain context information about mobile entities (users or devices) independent of(More)
Mondial pervasive games exchange the game board for earth’s surface and the users themselves wander over the earth as game pieces over the game board. ContextKing is a mondial pervasive game that uses sensory inputs from the real-world to create a new game experience that can be played within the user’s social network, whenever the user(More)
We present IYOUIT, a prototype service to pioneer a context-aware mobile digital lifestyle and its reflection on the Web. The application is based on a distributed infrastructure that incorporates Semantic Web technologies in several places to derive qualitative interpretations of a user’s digital traces in the real world. Networked components map(More)
A context management system is a distributed system that enables applications to obtain context information about (mobile) users and forms a key component of any pervasive computing environment. Context management systems are however very environment-specific (e.g., specific for home environments) and therefore do not interoperate very well. This limits the(More)
The accelerating growth of cities provides new challenges for urban planning, especially related to transportation. Many existing infrastructures already operate at their limits during rush hours or large events. They need to be used more efficiently as they often cannot be extended without considerable negative effects for citizens such as increasing(More)
Tagging with free form tags is becoming an increasingly important indexing mechanism. However, free form tags have characteristics that require special treatment when used for searching or recommendation because they show much more variation than controlled keywords. In this paper we present a method that puts this large variation to good use. We introduce(More)
We present a system that enables applications to discover and obtain information that describes the context of a particular entity (e.g., a user or a device). Our system revolves around the notion of a context agent, which is a service that represents an entity and provides access to context information about that entity. Context agents facilitate the(More)
In this paper we present a Web services-based platform that facilitates and speeds up the development and deployment of context-aware, integrated mobile speech and data applications. The platform is capable of handling different types of context and offers sophisticated personalization mechanisms. To illustrate the usefulness of the platform and to validate(More)