This paper is concerned with the problem of the optimal output feedback under the LQ index.

本文研究了线性二次型指标下的最优输出反馈问题。

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By the methods of LQ index and ID index, this paper makes a statistical study on the regional differentiation of food supplies in China from 1990 to 2002.

本文采用LQ指数和ID指数，对中国在1990年和2002年粮食生产的区域分化状况进行了统计分析。

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Choosing the proper state weight matrix Q in the LQ index by the system parameters, we can express the state feed-back solution of the LQ problem in the form of the output feedback.

根据系统参数，在二次型指标中适当选择状态加权矩阵q可以将LQ问题的状态反馈解表成输出反馈的形式。

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