Thirty Chinese core bioinformatics journals were determined using the concept of knowledge density gradient in combination with the distribution pattern of journal papers,and the newly founded Chinese bioinformatics journals were evaluated using the impact weight,reputation coefficient and H index.

The industrial production, especially the contemporary Hi-tech economy, is featured by a comprehensive penetration of science into production with the shift of knowledge-scarce production to knowledge-intensive production.

For solving the issue of key distribution in the clustered sensor networks,proposed a key distribution scheme base on layers,in which base station sends the secret knowledge of member nodes to the cluster-header,and member nodes establish pairwise key with their neighbor nodes via cluster-header.