I have an M. Sc. in Computer Sciences from the Royal Institute of Technology, Stockholm and a Ph. Lic. in Computer Science from Uppsala University. The work on the M. Sc. was accomplished at Ellemtel Utvecklings AB. I have been working at SICS since March 1998.

Research Interests

My main interests concern anomaly detection and network security risk analysis, trust management, machine learning and the issues of building distributed self-organising systems where the entities, to improve their performance, organise themselves based on their interactions. My Ph. Lic Thesis was about bootstrapping and decentralizing recommender systems, and my M. Sc. Thesis concerned how software agents can collaborate to perform social information filtering for their users.

Current Work

Currently, I am working in the Industrial Applications and Methods Laboratory. Previously, I worked in the now discontinued Security, Policy and Trust Laboratory. My research focus is on anomaly detection and network security risk analysis as part the Vinnova funded Center for Networked Systems.

I have started a blog to discuss intrusion detection issues at http://deeptrust.blogspot.com

Previous Work

Previously I have worked with recommender systems and something I call decentralised recommender systems or distributed social filtering based on the metaphore. I have also worked with trust modelling to deduce or induce measures of trust between interacting entities. In the context of contract management in virtual organizations, I have worked with the problem on how to monitor and detect violations to Service Level Agreements.

Publications and papers

• G. Boström, P. Giambiagi and T. Olsson. Quality of Service Evaluation in Virtual Organizations using SLAs. 1st International Workshop on Interoperability Solutions to Trust, Security, Policies and QoS for Enhanced Enterprise Systems (IS-TSPQ 2006), March 2006.
• Olsson, T. 2003. Bootstrapping and Decentralizing Recommender Systems. Licentiate thesis 2003-006, Department of Information Technology, Uppsala University.  [PDF]
• R. Cöster, A. Gustavsson, T. Olsson and Å. Rudström. 2002. Enhancing Web-Based Configuration with Recommendations and Cluster-Based Help. In Proceedings of the AH'2002 Workshop on Recommendation and Personalization in eCommerce, Málaga, Spain, May 28th [PDF]
• Olsson, T., Rasmusson, A. and Janson, S. 2000. Personalized Decentralized Communication. Appeared in the Workshop papers of the AAAI Spring Symposium Series 2000: Bringing Knowledge to Business Processes. [PDF]
• Rasmusson, A &  Olsson, T &  Hansen, P. 1998. A Virtual Community Library: SICS Digital Library Infrastructure Project. Research and Advanced Technology for Digital Libraries. Second European Conference, ECDL’98, Heraklion, Crete, 19-23 September, Proceedings. Lecture Notes in Computer Science, Vol 1513. pp 677-678. Springer. [Poster] [HTML | Postscript]
• Olsson, T. 1998b. Decentralized Social Filtering based on Trust. In: AAAI-98 Recommender Systems Workshop Papers. Technical Report WS-98-08. pp 84-88. AAAI Press. [HTML | Postscript]

• Olsson, T. 1998a. Information Filtering with Collaborative Interface Agents. M. Sc. Thesis. Department of Computer and Systems Sciences, Royal Institute of Technology, Sweden. [PDF]

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