The LNCS journal Transactions on Large-Scale Data- and
Knowledge-Centered Systems focuses on data management, knowledge
discovery, and knowledge processing, which are core and hot topics in
computer science. Since the 1990s, the Internet has become the main
driving force behind application development in all domains. An increase
in the demand for resource sharing across different sites connected
through networks has led to an evolution of data- and
knowledge-management systems from centralized systems to decentralized
systems enabling large-scale distributed applications providing high
scalability. Current decentralized systems still focus on data and
knowledge as their main resource. Feasibility of these systems relies
basically on P2P (peer-to-peer) techniques and the support of agent
systems with scaling and decentralized control. Synergy between Grids,
P2P systems, and agent technologies is the key to data- and
knowledge-centered systems in large-scale environments. This, the third
issue of Transactions on Large-Scale Data- and Knowledge-Centered
Systems, contains two kinds of papers: Firstly, a selection of the best
papers from the third International Conference on Data Management in
Grid and Peer-to-Peer Systems, Globe 2010, and secondly, a selection of
6 papers from the 18 papers submitted in response to the call for papers
for this issue. The topics covered by this special issue include
replication, the semantic web, information retrieval, data storage,
source selection, and large-scale distributed applications.