一年用两千亿美元极小成本去维持虚弱和苟延残喘状态的老龄化，最多能使他们的寿命增加1-2年。

There the small cost of 200 billion dollars a year to keep the elderly going in a frail and decrepit state that for most increases their lifespan for a year or two.

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进一步，在问题有解时，通过极小化增益矩阵元素绝对值的和，给出了求解期望低成本输出反馈控制的算法。

Then following the existing path-following method for solving BMI problem, an iterative LMI algorithm is proposed to locally search the desired output-feedback gain.

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