本文针对离散区间2 - D系统的二次稳定性问题，给出了线性矩阵不等式形式的判定条件。

This paper presents a condition in terms of linear matrix inequalities (LMIs) for the quadratic stability of discrete-time interval 2-d systems.

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研究两个多项式的根的相对分布的显式判定问题，得出两个三次多项式的根的相对分布以及二次和四次多项式的根的相对分布的显式判定。

We obtain the relative distribution of roots of two polynomials whose degrees are respectively 2 and 4, and we answer the same problem about the two polynomials of degree 3.

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第二个问题，建立符合港口国监督船舶滞留判定的数学模型，模型运算结果为港口国监督检查官提供判定参考。

Data of the recent years. The second is how to provide PSC officer decision-making reference when they are facing the difficulties.

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