An Ontology-Based Approach to Personalized Situation-Aware Mobile Service Supply

Abstract

Mobile devices such as personal digital assistants (PDAs) and mobile phones are in widespread use already today and converging to mobile smart phones. They enable users to access a wide range of services and information without guidance through their actual demands. Especially during mass events like the Olympic Games 2008 in BeijingVwhich was initially the context of our workVa large service space is expected to support all mobile visitors, being athletes, journalists, or spectators. Current approaches tackling such problems are location based, meaning that a user's location is central to service provision, and even context-aware, meaning that, beyond location, characteristics of a user's environment are taken into account. Such information obviously helps to deliver relevant information at the right time to the mobile users. Going one step further, a situation-aware system abstracts from the context dimensions by translating specific contexts into logical situations. Knowing the situation end users are in allows the system to better identify the information to be delivered to them and to choose the appropriate services with regard to their scope, which is referred to as service roaming. Even though many context frameworks have been introduced in the past few years, what is usually missing is the notion of characteristic features of contexts that are invariant during certain time intervals. This paper presents these concepts in the context of a platform development, namely FLAME2008, which is able to support its mobile users with personalized situation-aware services in push and pull mode.

Building a Thematic Spatial Data Infrastructure and Situation-Aware for Global Events

“…One example is the work published by [16] which used a context model for providing context-aware mobile services for the Beijing Olympics 2008. [17] proposes a mobile GIS contextaware to assist students, faculty, staff and visitors to find events and university sectors.…”

Using situation lattices in sensor analysis

“…Each situation corresponds to invariant characteristics of contexts and their combination [16]. Each of the characteristics can be expressed as a logical description that takes context predicates as input and applies logical operators between them.…”

Resolving uncertainty in context integration and abstraction

“…A situation abstracts the invariant characteristics of contexts and their combination [24]. Once the current contexts meet the characteristics, a situation is considered occurring.…”