Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, December 2003. / Thesis advisor(s): H. Lyman Miller, Glenn Cook. Includes bibliographical references (p. 69-74). Also available online.

Huge amounts of data are being collected as a result of the increased use of mobile telecommunications. Insight into information and knowledge derived from these databases can give operators a competitive edge in terms of customer care and retention,<br /> marketing and fraud detection. One of the strategies for fraud detection checks for signs of questionable changes in user behavior. Although the intentions of the mobile phone users cannot be observed, their intentions are reflected in the call data which define usage patterns. Over a period of time, an individual phone generates a large pattern of use. While call data are recorded for subscribers for billing purposes, we are making no prior assumptions about the data indicative of fraudulent call patterns, i.e. the calls made for billing purpose are unlabeled. Further analysis is thus, required to be able to isolate fraudulent usage. An unsupervised learning algorithm can analyse and cluster call patterns for each subscriber in order to facilitate the fraud detection process.<br /> <br /> This research investigates the unsupervised learning potentials of two neural networks for the profiling of calls made by users over a period of time in a mobile telecommunication network. Our study provides a comparative analysis and application of Self-Organizing Maps (SOM) and Long Short-Term Memory (LSTM) recurrent neural networks algorithms to user call data records in order to conduct a descriptive data mining on users call patterns.<br /> <br /> Our investigation shows the learning ability of both techniques to discriminate user call patterns / the LSTM recurrent neural network algorithm providing a better discrimination than the SOM algorithm in terms of long time series modelling. LSTM discriminates different types of temporal sequences and groups them according to a variety of features. The ordered features can later be interpreted and labeled according to specific requirements of the mobile service provider. Thus, suspicious call behaviours are isolated within the mobile telecommunication network and can be used to to identify fraudulent call patterns. We give results using masked call data<br /> from a real mobile telecommunication network.

Thesis (PhD)--University of South Australia, 2008.

This thesis presents the findings from a study on the adoption of mobile phones across ASEAN countries.

Thesis (PhD) - Swinburne University of Technology, 2001. / Submitted for the degree of Doctor of Philosophy, Swinburne University of Technology - 2001. Typescript. Includes bibliographical references (p. 120-128).

Thesis (M.App.Sc.) - Carleton University, 2002. / Includes bibliographical references (p. 85-87). Also available in electronic format on the Internet.

Thesis (M. App. Sc.)--Carleton University, 2005. / Includes bibliographical references (p. 63-64). Also available in electronic format on the Internet.

Thesis (Ph. D.)--State University of New York at Buffalo, 2002. / "May 10, 2002." Includes bibliographical references (p. 140-150). Also available in print.

Thesis (M. Phil.)--University of Hong Kong, 1999. / Includes bibliographical references (leaves 123-127).

Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2002. / Thesis advisor(s): Tri T. Ha, Jovan Lebaric. Includes bibliographical references (p. 63). Also available online.