3Roussopoulos N. MOCHA: A extensible database middleware system for distributed data sources. SIGMOD Conference, 2009, 8(12): 2130-2240.
4Dokeroglu T, Tosun U, CosarA. Particle swarm intelligence as a new heuristic for the optimization ofdistributed database queries. AICT/Tbilisi, 2012: 1-7.
5Wu WH, Liou JG, Li YF. A query optimization algorithm of database based on layered backtracking. ICEOE/Dalian, 2011(3): 178-180.
6Ilyas IF, Beskale G,, Soliman MA. A survey of top-k query processing techniques in relational database systems. ACM Computing Surveys, 2008(4): 11.
7Wang N, Wang NB. The realize the integration system and query optimization on the eterogeneous data source. Journal of Software, 2008, (2): 222-228.
8Tsai D, Lai S. Independent component Analysis-Based background subtraction for indoor surveillance. IEEE Trans. on IP, 2009, 18(1): 158-167.
