Crosstalk profile ? using the measured near - end loop noise psd , an estimate can be made of the type and number of crosstalkers present . again , this is a multi - variate optimization problem 串扰概图使用已测的近端环路噪声psd ，就可以估计当前串扰的类型和数量。这也是一个多变量的最优化问题。
2.
1 . 4 based on the attribute db , the soil classification graphic db is set up by using arc / info cis . the soil order , suborder sketchs and basic classification unit ( series ) sample maps , make the distribution of soil in hubei province clear at a glance 4在属性数据库的基础上，利用arc infogis建立了湖北省土壤分类图形数据库(空间数据库) ，运用计算机编制和输出了全省土壤系统分类土纲、亚纲概图和基层分类单元(土系)样块图，使全省土壤分布状况一目了然。
