However, the traditional DEA methods do not get out of the trouble of randomness in determining the effective frontier.
然而，由于传统DEA方法在确定有效前沿面方面还没有走出随机性的困境。
Objective To prevent the spreading of water-born infectious diseases, do effective surveillance on their pathogeny in Zhujiang water at the frontier port area.
目的通过监测口岸辖区内珠江水中水源性传染病病源，有效地预防水源性传染病在国境口岸的传播。
Compare two kinds of hollow aqueducts which frontier walls thickness, and select one that is more effective to reduce the thermal stress.
本文对比分析了两种不同边墙厚度的空心渡槽对温度应力减小的效果，并从中选出一种更有效的空心渡槽。
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