641 search results - page 75 / 129 » Studying Query Expansion Effectiveness |
CIKM
2009
Springer
14 years 10 days ago
2009
Springer
While provenance has been extensively studied in the literature, the efficient evaluation of provenance queries remains an open problem. Traditional query optimization techniques...
VLDB
2007
ACM
14 years 9 months ago
2007
ACM
Incompleteness due to missing attribute values (aka "null values") is very common in autonomous web databases, on which user accesses are usually supported through media...
PVLDB
2008
13 years 8 months ago
2008
Time series data is common in many settings including scientific and financial applications. In these applications, the amount of data is often very large. We seek to support pred...
SIGMOD
2009
ACM
14 years 9 months ago
2009
ACM
In this paper, we study a novel form of continuous nearest neighbor queries in the presence of obstacles, namely continuous obstructed nearest neighbor (CONN) search. It considers...
MIDDLEWARE
2004
Springer
14 years 2 months ago
2004
Springer
The Internet provides a wealth of useful information in a vast number of dynamic information sources, but it is difficult to determine which sources are useful for a given query. ...