Browsing by Author "Contreras, P."
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Item Metadata only Analytics of Research Literature Quality through Content and Semantics of the Scholarly Literature(60th ISI World Statistics Congress - ISI2015, 2015) Murtagh, F.; Casey, Arlene; Ahmadi, Samad; Contreras, P.Item Metadata only Clustering and semantics preservation in cultural heritage information spaces(2010) Pereira, J.; Schmidt, F.; Contreras, P.; Murtagh, F.; Astudillo, H.Item Metadata only Clustering Insider Threat Behaviour: An Ultrametric Anomaly Detection System(2015-07) Contreras, P.; Murtagh, F.; Hadlington, L. J.; Scott, K.Anger, aggression and confrontational behaviour (Greitzer et al., 2012) is one of 12 psychosocial precursors linked to malicious insider threat activity. Although there is not a given threshold at which these become a cause for concern, the manifestation of anger through aggressive language becomes relevant to indicate a potential insider threat, in particular when patterns outside of normal behaviour are observed. In previous work we have shown how an ultrametric (Murtagh et al., 2008, Contreras et al., 2012) can be used to create hierarchical clusters in constant algorithmic time. In this work we introduce the use of such ultrametric applied to textual data in order to cluster anomalous aggressive behaviour. Our interest lies in detecting anomalies that can be used in conjunction with other behavioural precursors (e.g. stress, network tra c, etc.) to detect an insider threat.Item Metadata only Cyber Security – Host-based Insider Threat Detection – Automated Threat Detection Using Novel Behavioural Threat Indicators. End of Project Report, CDE34941(2014-08) Hadlington, L. J.; Contreras, P.; Dean, J.; Dipsis, N.; Hallaq, B.; Mallows, E.; Scott, K.; Watson, T.Item Metadata only Fast hierarchical clustering from the Baire distance(Springer, 2010) Contreras, P.; Murtagh, F.Item Metadata only Fast, linear time hierarchical clustering using the Baire metric(2012) Contreras, P.; Murtagh, F.Item Metadata only Item Metadata only Hierarchical clustering of massive, high dimensional data sets by exploiting ultrametric embedding(SIAM, 2008) Murtagh, F.; Downs, G.; Contreras, P.Item Metadata only Linear time Baire hierarchical clustering for enterprise information retrieval(2012) Contreras, P.; Murtagh, F.Item Metadata only Scale-Based Gaussian Coverings: Combining Intra and Inter Mixture Models in Image Segmentation(2009) Starck, J. L.; Murtagh, F.; Contreras, P.