分层

Excepting the conventional methods of surveying samples, such as simple random sampling, stratified sampling, cluster sampling, systematic sampling, liner regression sampling, ratio estimator, two-stage sampling, double sampling, rotate sampling, non-probability sampling, there is sequential sampling and mark-recapture, particularly mark-recapture was introduced in detail.

针对生物资源的调查，除了一般抽样方法如：简单随机抽样、分层抽样、整群抽样、系统抽样、双重抽样、二阶抽样、样本轮换、比率估计、线性回归抽样和不等概抽样，还有序贯抽样和标记-重捕获方法，这里特别详细介绍了标记-重捕获方法。

Introducing hierarchy to a flat statechart diagram is a common way to improve its readableness.

3提出了一种基于XOR状态的分层抽象简单状态图的方法。

The Luneburg lens antenna is composed of a series of concentric shells of constant permittivity. Considering the complexity of numerical calculation, this paper presents a closed-form approach, which combines the spherical vector wave method and the reciprocity theorem.

摘要伦伯透镜是一种球形分层介质天线，考虑到数值计算的复杂性，本文提出用矢量球面波理论和互易原理相结合，分析其性能。

Thesaurus concept hierarchy collaborative filtering algorithm improves search efficiency and quality of recommendatory results significantly which is proved by elementary test and analysis.

经过初步的测试分析，主题词概念分层协同过滤推荐算法可以显著的提高查询效率和推荐结果的质量。

Firstly, it deals with data in advance by thesaurus concept hierarchy; secondly, it gives different weights for different target information resources; thirdly, it calculates the recommendatory results by adopting traditional similarity measure methods; finally, it optimizes quality of recommendatory results by continual process.

它首先通过主题词概念分层对数据进行预处理，继而对不同的目标资源赋予不同的权重系数，然后采用常用的相似性算法，生成最终的推荐结果，并通过不断的重复操作优化推荐结果的质量。

Our code was realized adequately reduplicate using and greatly reduce the exploitation time and work force due to we use the MVC model to explore.

由于本系统采用了MVC系统架构模式进行开发，在开发过程中代码实现了充分的重用，可分层次同时开发，极大地减低了开发时间和工作量。

It will fulfill four scientific objectives, including a three-dimensional survey of the Moon's surface, analysis of the abundance and distribution of elements on lunar surface, an investigation of the characteristics of lunar regolith and the powdery soil layer on the surface, and an exploration of the circumstance between the earth and the moon.

它在月球表面将履行四个科学宗旨，包括元素的月亮的表面、分析对丰盈和发行的一次三维勘测月球风化层的特征的调查和粉状土壤在表面和情况的探险分层堆积在地球和月亮之间。

The delaminated learning property of dual CMAC is used to amend the contradiction between net's learning speed and approach ability, and the complicated regressor matrix need not to be calculated in this algorithm.

通过利用双网结构的分层逼近机制，缓解了CMAC学习速度与逼近精度间的矛盾关系，另外，算法还避免了繁琐的并联机器人回归矩阵计算。

Graph pyramids in image segmentation can accumulate local features, representing in a coarse definition the global features. Pyramids have two classes: regular and irregular pyramid.

金字塔图像分割方法是一种分层的分析方法，其突出优点是可以累积局部特征，从而表现全局特征。

The results of stratified analysis showed that the reinfection levels were higher in the younger than in the older.

分层分析发现，在暴露水平相似的情况下低年龄组较高年龄组更易发现再感染或重度再感染。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。