This paper expounds the significance of the rope creep protection, introduces the traditional method for realizing the rope creep protection, analyzes the problems existing in the rope creep protection by using the position switch, and puts forward some methods for realizing the rope creep protection of the winch by using the counting/comparing function of the PLC.

Traditional Rete algorithm is inadequate for industry systems which require much numerical comparison calculation, and those systems might take too much resource to realize the match pattern of Rete algorithm.

And at the same time,a kind of circuity-evading strategy based on parameter comparison and link backtracking restoration is presented in this paper,in order to r.

In the paper, by using some theorems of risk neutral pricing (martingale method), comparison of coefficients and linear algebra, we will discuss the pricing formula of buying option which underling assets subject to many fac.