Ben Bratu
Motorola
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Publication
Featured researches published by Ben Bratu.
european conference on information retrieval | 2009
Symeon Papadopoulos; Fotis Menemenis; Yiannis Kompatsiaris; Ben Bratu
Contextual advertising is a form of online advertising presenting consistent revenue growth since its inception. In this work, we study the problem of recommending a small set of ads to a user based solely on the currently viewed web page, often referred to as content-targeted advertising. Matching ads with web pages is a challenging task for traditional information retrieval systems due to the brevity and sparsity of advertising text, which leads to the widely recognized vocabulary impedance problem. To this end, we propose the use of lexical graphs created from web corpora as a means of computing improved content similarity metrics between ads and web pages. The results of our experimental study provide evidence of significant improvement in the perceived relevance of the recommended ads.
International Journal of Digital Multimedia Broadcasting | 2008
Maria Papadogiorgaki; Vasileios Papastathis; Evangelia Nidelkou; Simon Waddington; Ben Bratu; Myriam Ribiere; Ioannis Kompatsiaris
This paper presents a distributed client-server architecture for the personalized delivery of textual news content to mobile users. The user profile consists of two separate models, that is, the long-term interests are stored in a skeleton profile on the server and the short-term interests in a detailed profile in the handset. The user profile enables a high-level filtering of available news content on the server, followed by matching of detailed user preferences in the handset. The highest rated items are recommended to the user, by employing an efficient ranking process. The paper focuses on a two-level learning process, which is employed on the client side in order to automatically update both user profile models. It involves the use of machine learning algorithms applied to the implicit and explicit user feedback. The systems learning performance has been systematically evaluated based on data collected from regular system users.
international workshop on semantic media adaptation and personalization | 2007
Maria Papadogiorgaki; Vasileios Papastathis; Evangelia Nidelkou; Ioannis Kompatsiaris; Simon Waddington; Ben Bratu; Myriam Ribiere
This paper presents a distributed client-server architecture for the personalized delivery of textual news content to mobile users. The user profile is distributed across client and server, enabling a high-level filtering of available content on the server, followed by matching of detailed user preferences on the handset. The high-level user preferences are stored in a skeleton profile on the server, and the low- level preferences in a detailed user profile on the handset. A learning process for the detailed user profile is employed on the handset exploiting the implicit and explicit user feedback. The systems learning performance has been evaluated based on data collected from regular system users.
mobile and ubiquitous multimedia | 2008
Fotis Menemenis; Symeon Papadopoulos; Ben Bratu; Simon Waddington; Yiannis Kompatsiaris
When a user performs a web search, the first query entered will frequently not return the required information. Thus, one needs to review the initial set of links and then to modify the query or construct a new one. This incremental process is particularly frustrating and difficult to manage for a mobile user due to the device limitations (e.g. keyboard, display). We present a query formulation architecture that employs the notion of context in order to automatically construct queries, where context refers to the article currently being viewed by the user. The proposed system uses semantic metadata extracted from the web page being consumed to automatically generate candidate queries. Novel methods are proposed to create and validate candidate queries. Further two variants of query expansion and a post-expansion validation technique are described. Finally, insights into the effectiveness of our system are provided based on evaluation tests of its individual components.
Archive | 2010
Dorothea Tsatsou; Paul C. Davis; Symeon Papadopoulos; Fotis Menemenis; Ben Bratu; George Kalfas; Ioannis Kompatsiaris
Archive | 2008
Ben Bratu; Simon Waddington
Archive | 2009
Simon Waddington; Ben Bratu; Ioannis Kompatsiaris; Fotis Menemenis; Symeon Papadopoulos
Archive | 2007
Ioannis Informatics; Fotis Informatics; Evangelia Informatics; Ben Bratu; Symeon Papadopoulos; Simon Waddington
Archive | 2007
Simon Waddington; Ben Bratu; Ioannis Kompatsiaris; Evangelia Nidelkou; Maria Papadogiorgaki; Vasileios K. Papasthathis
Archive | 2008
Simon Waddington; David R. Bourne; Makram Bouzid; Ben Bratu