Just like the broom-stick, an Inverted Pendulum is an inherently unstable system. 就好象扫帚柄，一个倒立摆是一个天生的不稳定系统。
The first concern must be to reshape financial regulation to stabilise the system. 首要任务是必须重塑金融监管来稳定系统。
The accurate mathematical model of WIM is difficult to establish because WIM's parameters change with time when they work. 摘要动态称重系统在测量的过程中为一时变系统，难以对称重系统建立精确的数学模型。
STF adds multi-fading factors in EKF, thus it has strong tracking capability and good robustness, and can deal with variation parameter system effectively. 强跟踪滤波在卡尔曼滤波的基础上引入了多重渐消因子，使强跟踪滤波具有极强的跟踪能力和较好地鲁棒性，因此可以很好地解决变系统变参数的问题。
