Fei Liu is currently a PhD student at faculty of Electrical Engineering, Mathematics, and Computer Science, Chair Design and Analysis of Communication Systems, of the University of Twente (UT). Her research topic is "Context-aware Networking" under the supervision of Dr. Geert Heijenk. This PhD work is part of Freeband AWARENESS project sponsored by Dutch government.

Her Research interest is mobile and wireless networks, especially in:

• Context discovery

• Performance evaluation

• Dynamic connectivity

• Malicious attacks

Abstract: This PhD topic is a part of the Freeband AWARENESS (context AWARE mobile Networks and ServiceS) project, which mainly focuses on researching and designing a service and network infrastructure for context-aware and pro-active applications. The major application of the Freeband AWARENESS project is mobi-health. This PhD work designed and developed context discovery protocol Ahoy using attenuated Bloom filters in mobile ad-hoc networks (MANETs).  Based on this idea, an analytical model is developed and verified by comparing with the simulation model. By using the analytical model, we prove that our approach is very efficient, compared with conventional approaches in realistic situations. We can also calculate the various parameters settings using the analytical model. Further, the impact of dynamic connectivity and malicious attacks on the performance of our discovery mechanism is evaluated.  Finally, the interoperability with the Mobile Service Platform (MSP) is studied. A context discovery adapter (CDA)  between Ahoy and MSP is established and tested.

• F. Liu, G.J. Heijenk, Dynamic connectivity analysis of ABF-based ad-hoc networks. In: Proceedings of the 1st IFIP Wireless and Mobile Networking Conference, Sep 30 - Oct 02 2008, Toulouse, France. Springer Verlag.

• C. Hesselman, H. Benz, P. Pawar, F. Liu, M. Wegdam, M. Wibbels, T. Broens, and J. Brok, Bridging Context Management Systems for Different Types of Pervasive Computing Environments, In: Proceedings of the 1st International Conference on MOBILe Wireless MiddleWARE, Operating Systems, and Applications (MobileWare 2008), February 13-16, 2008, Innsbruck, Austria.

• F. Liu, P.T.H. Goering, and G.J. Heijenk, Modeling service discovery in ad-hoc networks. In: Proceedings of the Fourth ACM International Workshop on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous Networks, PE-WASUN 2007, Oct 22-26 2007, Chania, Greece. pp. 9-16. Association for Computing Machinery. ISBN 978-1-59593-808-4

• F. Liu, G.J. Heijenk, Context discovery using attenuated Bloom filters in ad-hoc networks. Journal of Internet Engineering, 1 (1). pp. 49-58. ISSN 1791-177X

• G. Heijenk, F. Liu, Interference-based Routing in Multi-hop Wireless Infrastructures, Computer Communications, 29 (13-14). pp. 2693-2701. ISSN 0140-3664 *** ISI Impact 0,444 ***

• F. Liu, G. Heijenk, Context Discovery using Attenuated Bloom Filters in Ad-hoc Networks, In: Proceedings 4th International Conference on Wired/Wireless Internet Communications, WWIC 2006, May 9-12, 2006, Bern, Switzerland. pp. 13-25. Lecture Notes in Computer Science 3970. Springer-Verlag. ISSN 0302-9743 ISBN 3-540-34023-8 (correction)

• F. Liu, G. Heijenk, Context discovery using attenuated Bloom codes: model description and validation, Technical Report University of Twente, TR-CTIT-06-09, ISSN 1381-3625, March 2006.

• G. Heijenk, F. Liu, Interference-based Routing in Multi-hop Wireless Infrastructures, In: Proceedings Wired/Wireless Internet Communications: Third International Conference, WWIC 2005, 11 - 13 May 2005, Xanthi, Greece. pp. 117-127. Lecture Notes in Computer Science 3510 / 2005. Springer-Verlag. ISSN 0302-9743 ISBN 3-540-25899-X.