Just like the broom-stick, an Inverted Pendulum is an inherently unstable system. 就好象掃帚柄，一個倒立擺是一個天生的不穩定系統。
The first concern must be to reshape financial regulation to stabilise the system. 首要任務是必須重塑金融監管來穩定系統。
The accurate mathematical model of WIM is difficult to establish because WIM's parameters change with time when they work. 摘要動態稱重系統在測量的過程中為一時變系統，難以對稱重系統建立精確的數學模型。
STF adds multi-fading factors in EKF, thus it has strong tracking capability and good robustness, and can deal with variation parameter system effectively. 強跟蹤濾波在卡爾曼濾波的基礎上引入了多重漸消因子，使強跟蹤濾波具有極強的跟蹤能力和較好地魯棒性，因此可以很好地解決變系統變參數的問題。
