CiteSeerX — Author Search Results — "Vassilis Plachouras"

Usefulness of hyperlink structure for query-biased topic distillation
by Vassilis Plachouras — 2004 — In Proceedings of the 27th Annual International SIGIR Conference on Research and Developement in Information Retrieval
…In this paper, we introduce an information theoretic method for estimating the usefulness of the hyperlink structure induced from the set of retrieved documents. We evaluate the effectiveness of this method in the context of an optimal Bayesian decision mechanism, which selects the most appropriate …
Cited by 6 (4 self) – Add To MetaCart

Longman Dictionary of Contemporary English
by Vassilis Plachouras, Iadh Ounis — 2007 — in ‘Proceedings of the 29th European Conference on Information Retrieval (ECIR ’07
…Abstract. Document fields, such as the title or the headings of a document, offer a way to consider the structure of documents for retrieval. Most of the proposed approaches in the literature employ either a linear combination of scores assigned to different fields, or a linear combination of freque…
Cited by 2 (1 self) – Add To MetaCart

Dempster-Shafer theory for a query-biased combination of evidence on the web
by Vassilis Plachouras, Iadh Ounis — 2005 — Information Retrieval
…Abstract. This paper reports on a large-scale experiment for the evaluation of a formal query-biased combination of evidence mechanism. We use the Dempster-Shafer theory of evidence to combine optimally results obtained by content and link analyses on the Web. The query-biased mechanism is based on …
Cited by 2 (0 self) – Add To MetaCart

Query-biased combination of evidence on the web
by Vassilis Plachouras, Iadh Ounis — 2002 — In Mathematical/Formal Methods in Information Retrieval Workshop, ACM SIGIR
…Recent research has shown that the hyperlink structure of the World Wide Web can be a rich source of information about the content of the environment, provided that there are effective means of understanding it. However, experience also suggests that while hyperlink structure analysis improves the o…
Cited by 1 (0 self) – Add To MetaCart

University of glasgow at trec 2005: Experiments in terabyte and enterprise tracks with terrier
by Craig Macdonald, Ben He, Vassilis Plachouras, Iadh Ounis — 2005 — In Proceedings of TREC-05
…With our participation in TREC 2005, we continue experiments using Terrier, a modular and scalable Information Retrieval (IR) framework, in 4 tasks from the Terabyte and Enterprise tracks. In the Terabyte track, we investigate new Divergence From Randomness weighting models, and a novel query expa…
Cited by 15 (10 self) – Add To MetaCart

University of Glasgow at TREC2004: Experiments in Web, Robust and Terabyte tracks with Terrier
by Vassilis Plachouras, Ben He, Iadh Ounis — 2004 — In Proceedings of TREC 2004
…With our participation in TREC2004, we test Terrier, a modular and scalable Information Retrieval framework, in three tracks. For the mixed query task of the Web track, we employ a decision mechanism for selecting appropriate retrieval approaches on a per-query basis. For the robust track, in order …
Cited by 11 (5 self) – Add To MetaCart

Performance analysis of distributed architectures to index one terabyte of text
by Fidel Cacheda, Vassilis Plachouras, Iadh Ounis — 2004 — Proc. 26th European Conference on IR Research, volume 2997 of Lecture Notes in Computer Science
…Abstract. We simulate different architectures of a distributed Information Retrieval system on a very large Web collection, in order to work out the optimal setting for a particular set of resources. We analyse the effectiveness of a distributed, replicated and clustered architecture using a variabl…
Cited by 7 (2 self) – Add To MetaCart

Performance analysis of distributed information retrieval architectures using an improved network simulation model
by Fidel Cacheda, Victor Carneiro, Vassilis Plachouras, Iadh Ounis — 2007 — Information Processing and Management
…Abstract. In this study, we present the analysis of the interconnection network of a distributed Information Retrieval (IR) system, by simulating a switched network versus a shared access network. The results show that the use of a switched network improves the performance, especially in a replicate…
Cited by 4 (3 self) – Add To MetaCart

A decision mechanism for the selective combination of evidence in topic distillation
by Vassilis Plachouras, Fidel Cacheda, Iadh Ounis — Information Retrieval
…The combination of evidence can increase retrieval effectiveness. In this paper, we investigate the effectiveness of a decision mechanism for the selective combination of evidence for Web Information Retrieval and particularly for topic distillation. We introduce two measures of a query’s broadness …
Cited by 2 (1 self) – Add To MetaCart

The dynamic absorbing model for the web
by Gianni Amati, Iadh Ounis, Vassilis Plachouras — 2003 — Journal of Web Engineering
…In this paper we propose a new theoretical method for combining both content and link structure analysis for Web information retrieval. This approach is based on performing a random walk on a modified Markov chain, induced from the Web graph. This new model is applicable either in a static way, wher…
Cited by 9 (3 self) – Add To MetaCart

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