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AIRS
2010
Springer
15 years 2 months ago
Dynamics of Genre and Domain Intents
Abstract. As the type of content available on the web is becoming increasingly diverse, a particular challenge is to properly determine the types of documents sought by a user, tha...
Shanu Sushmita, Benjamin Piwowarski, Mounia Lalmas
ICTIR
2009
Springer
15 years 2 months ago
An Analysis of NP-Completeness in Novelty and Diversity Ranking
Abstract. A useful ability for search engines is to be able to rank objects with novelty and diversity: the top k documents retrieved should cover possible interpretations of a que...
Ben Carterette
SIGIR
2011
ACM
14 years 7 months ago
Ad hoc IR: not much room for improvement
Ranking function performance reached a plateau in 1994. The reason for this is investigated. First the performance of BM25 is measured as the proportion of queries satisfied on th...
Andrew Trotman, David Keeler
ICDE
2002
IEEE
102views Database» more  ICDE 2002»
16 years 5 months ago
Cost Models for Overlapping and Multi-Version B-Trees
Overlapping and multi-version techniques are two popular frameworks that transform an ephemeral index into a multiple logical-tree structure in order to support versioning databas...
Yufei Tao, Dimitris Papadias, Jun Zhang
VLDB
2007
ACM
144views Database» more  VLDB 2007»
16 years 4 months ago
Cooperative Scans: Dynamic Bandwidth Sharing in a DBMS
This paper analyzes the performance of concurrent (index) scan operations in both record (NSM/PAX) and column (DSM) disk storage models and shows that existing scheduling policies...
Marcin Zukowski, Sándor Héman, Niels...