Many commercial database systems maintain histograms to summarize the contents of relations and permit the efficient estimation of query result sizes and the access plan cost. In spatial database syst
Onion-like Fullerenes were produced at high-temperature in vacuum. The morphology of the carbon nano onion-like fullerenes was examined and characterized by hig
The problem of long transactions is a significant problem in spatial database.The checkout mechanism and multi-version mechanism are two kind methods of solving
Recently, attention has been focused on spatial query language which is used to query spatial databases. A design of spatial query language has been presented i
This article studies the closed-form expressions of outage performance for opportunistic relay under aggregate power constraint in decode-and-forward(DF)relay n