必须维护趋势模型，以及通知标准的网络。
The trending models must be maintained, and a network of notification criteria maintained.
许多趋势模型是在20世纪70年代末80年代初建立的。
Many of the trend-following models were developed in the late 1970s and early 1980s.
以指数趋势模型为基础，建立卡尔曼滤波模型对链子崖危岩体ga监测点的位移量进行预测。
Based on the exponential trend model, the Kalman filter model is applied to forecasting displacement values at observation point in Lianziya hazardous rock mass GA.
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