无对角线四边形法是建立建筑方格网中二级网的有效方法。对于建筑方格网来说，重要的方面之一是可以评定网中任意元素的精度。
One of the important factors involved in building a square grid is the way to estimate the precision of any elements in the grid.
为了提高蛋白质二级结构预测精度，本文尝试采用一种基于串联BP网络集成的二级结构预测模型。
To improve the prediction results of protein secondary structure, we developed a neural network ensemble model based on dual-layer feed forward BP network.
表明： 基于氨基酸组成和有偏自协方差函数为特征矢量的BP神经网络预测蛋白质二级结构含量的方法可有效提高预测精度。
It is shown that the BP neural network method combined with the amino-acid composition and the biased auto-covariance function features could effectively improve the prediction accuracy.
协同利用数学变换、高精度近似和二级逼近策略，提出了一种求解结构优化问题的准解析法。
A quasi analytic method for solving structural optimization problems is developed by coordinated use of mathematical transformations, high quality approximation and two level approximation strategy.
并可以根据要求随意组合，如一级滤芯精度采用10微米，二级滤芯精度采用5微米或3微米。
And can according to call for free rein combination, two stage strainer accuracy adopt 5 microns or 3 microns if one-level strainer accuracy adopt 10 microns.
验证结果表明二级人口区划后的人口空间化数据在数值精度和空间精度上都有明显提高。
The result of comparison indicated that the precision of population distribution based on class-2 regionalization was improved both in numerical and spatial aspects.
验证结果表明二级人口区划后的人口空间化数据在数值精度和空间精度上都有明显提高。
The result of comparison indicated that the precision of population distribution based on class-2 regionalization was improved both in numerical and spatial aspects.
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