621 search results - page 42 / 125 » Efficient algorithms for minimizing tree pattern queries |
SIGMOD
1999
ACM
14 years 10 days ago
1999
ACM
In this paper we present a mechanism for translating constraint queries, i.e., Boolean expressions of constraints, across heterogeneous information sources. Integrating such syste...
SEMWEB
2010
Springer
13 years 5 months ago
2010
Springer
We study the problem of SPARQL query optimization on top of distributed hash tables. Existing works on SPARQL query processing in such environments have never been implemented in a...
SKG
2006
IEEE
14 years 2 months ago
2006
IEEE
Data Grid is one of the important research subjects in the field of Grid Computing. To get a high efficiency of the system, this paper proposes a set of novel multicast algorithms...
ICDE
2004
IEEE
14 years 9 months ago
2004
IEEE
The effectiveness of many existing high-dimensional indexing structures is limited to specific types of queries and workloads. For example, while the Pyramid technique and the iMi...
STOC
1993
ACM
14 years 3 days ago
1993
ACM
In this paper, we study the problem of learning in the presence of classification noise in the probabilistic learning model of Valiant and its variants. In order to identify the cl...