Whether current relevance is the exclusive feature of the present perfect aopect has been one of the hot topics under debate among linguists both at home and abroad.

The theory of “current relevance” as the inherent semantic feature of the English perfective has been affirmed by most of the scholars in the linguistic circles, but its meaning has never been clearly expounded.

According to some problems existed in network intrusion detection technique,such as alerts overwhelming,false-positives and lack of alert description,this paper introduces chronicle correlation method to alert events analysis by some correlative examples.

Response function is utilized to fit experimental data for several important physical processes of time-dependent radiation response of MOSFET,including the short-term recovery due to hole transport,the long-term recovery due to trapped hole anneal and the long-term buildup of interface traps.

The computational model of MOS Devices on time-dependent response of pulse total dose effects on MOS Devices is set up in the paper,including short-term recovery due to hole transport,the long-term recovery due to trapped hole anneal and the long-term buildup of interface traps.

New kind time correlation system based on Tek TDS684C digital oscilloscope;