By W. Bruce Croft (auth.), Mohand Boughanem, Catherine Berrut, Josiane Mothe, Chantal Soule-Dupuy (eds.)
This publication constitutes the refereed court cases of the thirtieth annual ecu convention on details Retrieval learn, ECIR 2009, held in Toulouse, France in April 2009.
The forty two revised complete papers and 18 revised brief papers offered including the abstracts of three invited lectures and 25 poster papers have been rigorously reviewed and chosen from 188 submissions. The papers are prepared in topical sections on retrieval version, collaborative IR / filtering, studying, multimedia - metadata, professional seek - ads, evaluate, opinion detection, net IR, illustration, clustering / categorization in addition to allotted IR.
Read or Download Advances in Information Retrieval: 31th European Conference on IR Research, ECIR 2009, Toulouse, France, April 6-9, 2009. Proceedings PDF
Best european books
The fad towards privatization, which started with privatization experiments within the united kingdom less than Margaret Thatcher and the deregulation of the telecommunications region within the usa, has attracted the eye of policymakers during the last 20 years. Privatization is extensively supported via such a lot educational economists, however the result of genuine privatization efforts look combined.
The garage of carbon in wooded area ecosystems has obtained detailed realization within the Kyoto protocol of the weather conference, which makes an attempt to equilibrate fossil gasoline emissions with organic sinks. This quantity quantifies carbon garage in controlled woodland ecosystems not just in biomass, but additionally in all soil booths.
Cambridge Yearbook of eu felony experiences presents a discussion board for the scrutiny of important concerns in ecu legislation, the legislation of the ecu conference on Human Rights, comparative legislations with a ecu measurement, and especially these concerns that have come to the fore through the yr previous this book.
Peptides: complaints of the 6th eu Symposium, Athens, September 1963
- Connector Industry. A Profile of the European Connector Industry–Market Prospects to 1999
- European Union Law: Cases and Materials, 2nd Edition
- European Populations: Unity in Diversity
- Eintrittsbarrieren in japanische Märkte: Das Beispiel Recycling-Industrie
Additional resources for Advances in Information Retrieval: 31th European Conference on IR Research, ECIR 2009, Toulouse, France, April 6-9, 2009. Proceedings
6) and Eq. (10), we have introduced parameter α to balance the expected overall relevance and its risk. 25 Variance (b) Fig. 2. The behaviors of parameter α. (a) The impact of the parameter α on the relevance and variance. (b) Eﬃcient Frontier. behavior and impact of the parameter α. Fig. 2 (a) plots the expected overall relevance and variance against the diﬀerent values of the parameter α, where the left y axis corresponds to the expected relevance of top-10 ranked documents and the right y axis shows the variance (uncertainty) of the list.
Probabilistic retrieval models usually rank documents based on a scalar quantity. However, such models lack any estimate for the uncertainty associated with a document’s rank. Further, such models seldom have an explicit utility (or cost) that is optimized when ranking documents. To address these issues, we take a Bayesian perspective that explicitly considers the uncertainty associated with the estimation of the probability of relevance, and propose an asymmetric cost function for document ranking.
Following similar trend as MRR in Figure 1 (a), curves in Fig. 1 (b) show that the MAPs increase quickly at the beginning, reach a peak for b between 0 and 10, and then declines gradually. However, the performance gain on MAP is not as signiﬁcant as that for MRR. The exact reason for the variation between MRR and MAP will be the subject of future work. We next compare to models using background smoothing. Fig. 1 (c) shows the performance gain on MRR for both Jelinek-Mercer and Dirichlet smoothing with diﬀerent parameters for the TREC8 collection.