The paper places an emphasis in analysing the general mechanism while boot viruses infect a system, that is to say, the boot Viruses programs allocate boot sector of the system, and modify some of interrupt vectors.

It is the boot sector that introduces OS into a bare computer.

Study of intercept action algorithm based on proportional navigation in robot soccer;

For those simple lag proportional navigation(PN) system,the solution is studied by the way of generalized power progression in this paper and is validated by the simulation.

The guidance algorithm is composed by three parts,including traditional proportional navigation,fuzzy logic based guidance and a guidance fusion unit.

A gain variable proportional guidance law for stationary target;

According to the characteristics of a depleted shutdown rocket missile with canard controls and using a series of hypothesis,a new guidance approach is introduced,in up-range it tries to insure the minimal up-down overload while in down-range proportional guidance is used.

in this paper,proportional guidance is used in the terminal guidance of kinetic energy interceptor on space, and the trajectory control thrusters are utilized to adjust the center of mass of interceptor motion.

attitude pursuit guidance) and proportional navigation guidance(PNG) using reconfiguration line-of-sight rate are analyzed in the first part.

The proportional navigation guidance(PNG) has several shortcomings.

First,if it is assumed that each missile has the same constant velocity,then the leader-missile ( "the leader" for short) is guided by the conventional proportional navigation guidance (PNG),and the led-missile ( "the follower" for short) is guided by a combination of the conventional PNG and a maneuver control.

Concerning the problem of maneuvering target tracking, the character of proportion guide is introduced into state equation to construct a linear time-varying system model, and the state estimate of the system can be obtained using the standard kalman filter with parameters.

Aiming at the motion characteristic of multiple platforms and multi-targets in the current war environment,various maneuvering and no-maneuvering target motion models which mainly include snake maneuvering,swerve motion and proportion guide motion and so on are constructed in this paper.