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Contact Person

Bob Kummerfeld
Bob Kummerfeld -

Bob Kummerfeld's research interests lie in the general area of pervasive computing with an emphasis on user modelling.

Project Description

Locator is a demonstrator application of Personis. Locator provides an interface which enables a community of people to locate other members of the community. To join the community, a user needs to register both themself and sensors that can provide evidence about their location. For example, a Bluetooth enabled phone can be registered. Another class of sensor is an activity sensor that detects when a person’s computer is in use.

The underlying infrastructure for Locator is based on Personis, which models people, places and devices. It makes use of a range of varyingly reliable evidence to reason about an individual’s location.

As Locator has been in actual use of a long period of time, it has provided insights into the way that people use and respond to such information about each other as well as and people’s attitudes to management of privacy.

Related Publications


Niu, William T; Kay, Judy

PERSONAF: Framework for Personalised Ontological Reasoning in Pervasive Computing Journal Article

User modeling and User-Adapted Interaction: the Journal of Personalization Research, 20 (1), pp. 1-40, 2010.

Links | BibTeX


Niu, William; Kay, Judy

Location Conflict Resolution with an Ontology Inproceedings

Proceedings of Pervasive 2008: 6th International Conference on Pervasive Computing, pp. 162-179, 2008.


Carmichael, David

Myplace: supporting scrutability and user control in location modelling PhD Thesis



Niu, William; Kay, Judy

Pervasive Personalisation of Location Information: Personalised Context Ontology Inproceedings

AH: International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems, pp. 143-152, 2008.



Assad, Mark; Carmichael, David J; Kay, Judy; Kummerfeld, Bob

PersonisAD: Distributed, Active, Scrutable Model Framework for Context-Aware Services Inproceedings

Proceedings of PERVASIVE 07, 5th International Conference on Pervasive Computing, pp. 55-72, Springer, Toronto, Ontario, Canada, 2007, ISBN: 978-3-540-72036-2.

Links | BibTeX

Assad, Mark; Carmichael, David J; Kay, Judy; Kummerfeld, Bob

MyPlace Locator: Flexible Sharing of Location Information Inproceedings

Proceedings of UM 2007, 11th International Conference on User Modeling, pp. 410–414, Springer, Corfu, Greece, 2007.


Niu, William; Kay, Judy

Improving Location Reasoning with an Ontology Technical Report