[计]符号函数
正负号函数
sign───n.迹象；符号；记号；手势；指示牌；vi.签署；签名；vt.签署；示意
function───n.功能；[数]函数；职责；盛大的集会；vi.运行；活动；行使职责
the sign───标志
prohibitory sign───禁止标志
zodiac sign───星座；生肖；黄道十二宫
positive sign───n.（数）正号，加号（同plussign）；n.正号
pisces sign───双鱼座
degree sign───学位标志
exit sign───[安全]出口标志
Accuracy analysis of the continuous analogy of sign function in dynamical calculation───动力计算中符号函数连续化的精度分析
Furthermore, in order to reduce the chattering phenomenon, the sign function in sliding-mode controller is replaced by the saturation function.
The paper studies the property of sign function and its application to mathematical analysis.
On the basis of analyzing the control step for ice conversing to hydrate and introducing the sign function, the unreacted core shrinking model for hydrate formation was proposed.
Using multi-layer perceptions network of sign function, a helicopter inverse dynamic model based on neural network, taking SH-2G as an example, is established.
In order to eliminate the chattering phenomenon in sliding-mode control, the saturation function is adopted to replace the sign function.
The sign function of the switching surface function is replaced by a suitable saturated function to reduce the system chattering.
It described the process of coal-gas abstracts gas with exponent sign function and concluded gas gushing quantity attenuates with negative exponent.