文章考虑投资者自身预测力存在估计误差的感知风险（参数不确定性）对投资者最优资产组合选择问题的影响。
The paper analyses the parameter uncertaintys effect on the investors optimal portfolio choice, it suggests if the investor ignores the estimation risk, he may by lead to take p.
从挠性陀螺组合安装误差模型入手，推导出存在轴不对准角情况下的挠性陀螺组合静态误差标定模型，并给出静态误差标定的位置试验方案。
The installation error model of the gyroscope integrated is analyzed, and then error calibration model of flexible gyroscope integrated is deduced when malalignment Angle is considered.
当时高度存在大误差时，采用副气囊和空气舵组合控制改变飞艇的姿态实现快速爬升或下降；
It is present a method to design altitude control system for a high altitude airship using auxiliary ballonet charge or deflation and elevator combination control.
当时高度存在大误差时，采用副气囊和空气舵组合控制改变飞艇的姿态实现快速爬升或下降；
It is present a method to design altitude control system for a high altitude airship using auxiliary ballonet charge or deflation and elevator combination control.
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