rule of effectiveness

An indicator system for effectiveness of ERA was established with four above factors as criteria which is divided into three layers, namely the target layer, the rule layer and index layer, altogether 17 indicators.

以上述四个因素为准则，构建了环境风险评价有效性的指标体系，该指标体系分为目标层、准则层、指标层3个层次，共17项指标。

The change rule of effectiveness of different force value of protraction in the same direction differs in different stress zone. 6.

相同方向不同力值的牵引力在不同大小区间，其效应的变化规律不同。

The conventional GA algorithm is improved in the number of the population, the possibility of the crossover and the rule of the termination for the practical control objective. The simulation demonstrates the effectiveness of the improved algorithm.

并针对实际的控制目标对一般的遗传算法在种群数量，交叉概率和终止准则等方面进行了改进，仿真结果表明了所提出的改进算法的有效性。