For the output feedback design of discrete-time linear system, we consider the integral controller using prediction type reduced-order observer.

对于离散时间线性系统的输出反馈设计，我们考虑使用预测型降维观测器的积分控制器。

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The coupled boundary integral equations and their reduced forms are deduced for hybrid mode problems, and these equations are discreted into a system of linear algebraic equations by moment method.

导出了关于混合模的耦合边界积分方程组及其退化形式，并用矩量法将之离散为齐次代数方程组，从而得波导的混合模传输常数；

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A linear integral invariant, a universal integral invariant and an absolute integral invariant of second order of the system are obtained under the given condition.

给出系统存在积分不变量的条件，在此条件下导出系统的线性积分不变量、通用积分不变量和二阶绝对积分不变量。

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