This paper adopts a simple server model and investigates an efficient kind of algorithms for multi-server selection under the condition of imprecise network delay, using approach of ticket-based probing to search the path with short delay and probe the server capability at the same time.

The result is fine, which shows that the data snooping method with the new weighting function can locate all the measurements with blunders of the framework accurately and effectively in the case that the accuracy of distance measurements are different and a few blunders coexist.

Reliability analysis and data snooping are important contents in quality control of adjustment system.

By considering the quantitative relation between the residual error and the true error,this paper focuses on the data snooping and the iterative methods of weight defining for the robust estimation which are used to detect gross error.

By controlling the diffusion of exploratory message with optimal hops in free space model, the energy consumption can be more efficient.

At first the article analyses directed diffusion routing, then poposes a way which uses nodes’ regional information to control the initial interest diffusion and the diffusion of exploratory message with optimal hops.