查询词典 systematic sampling

In this dissertation, digital lock-in detection techniques under integer period sampling and non-integer period sampling are separately investigated (1) Under integer period sampling, digital signal sequence is acquired through sampling the measured signal, but digital reference sequence is acquired through mathematical operation, then digital lock-in detection can be realized by calculating crosscorrelation function of digital signal sequence and digital reference sequence Harmonic measure is also analyzed, and a method of measuring harmonic of a periodic signal under aliasing is put forward.

本文对使用采样ADC把模拟信号转换为数字信号并通过计算数字信号的相关函数来实现锁定检测的技术进行了研究，在此基础上设计了一个多功能的数字LIA并在一些科学实验中进行了应用。本文对整周期采样和非整周期采样时的数字锁定检测技术分别进行了研究。(1)在整周期采样时，对被测信号进行采样得到信号序列，而参考序列由数学运算得到，通过计算信号序列和参考序列的互相关函数就可实现锁定检测。

By constructing the piecewise linear function from samples, it is able to approximate the measured metric more precisely. Compared with current popular sampling algorithms, FASM algorithm can provide more precise estimation of metric under the same samples. In the condition of retaining the same approximation errors, our adaptive sampling methodology only requires fewer samples, which will save sampling costs considerably during sampling process.

与当前常用的抽样算法相比，在采集相同的样本数量情况下，本文的拟合模型对指标进行的估计更准确、稳定；而在保持相同的拟合误差时，自适应抽样算法则可显著减少所需采集的样本数量，节约数据采集过程的代价。

The definition of Halton points is introduced and the algorithm complexity is analyzed, then the sampling strategy of triangle plane is introduced, including geometry region partitioning, coordinate mapping between triangle plane and rectangle plane, and computing principle to the coordinates of sampling point. The experiment results compared with Jittered sampling and improved LHS sampling are given.

给出了Halton点的定义，分析了其算法复杂度，在此基础上给出了三角平面的采样策略，包括几何区域的划分、三角平面与矩形平面的坐标映射、采样点坐标计算原理；并将该方法与Jittered采样法、改进的LHS采样法进行了比较。

Applying mathematical statistics, this paper studied the characters of random sampling and its excessive random effect on other trip characters, put forward stratified sampling method, researched quota sampling and best distribution sampling.

建议对于大型城市采用简单随机抽样方法；而对于中小城市，按年龄分类，采用分层抽样方法，以提高调查精度。

The main work of this paper is to study the sampling theorem in domain of the fraction and the sampling relationship. We will try to obtain the theoretic sampling rate and the proof of feasibility. And we also give some relationship between the kernels under the meaning of sampling.

本文的主要工作就是，研究了分数傅立叶变换算子核函数的采样定理及采样关系，给出了一种能够达到理论的最佳采样频率的尝试，也给出了这种做法的可行性的证明，更进一步由采样关系给出了核函数的一些关系。

The survey conducted in Taiwan was designed using a multiple-stage sampling method that utilized the principles of probabilities proportional to size, stratified sampling, and systematic sampling to strengthen the sample's effective representation.

为符合研究的需要，本次研究的抽样方法采取较复杂的多阶段抽样法，主要应用「抽取率与单位大小成比例」原则，结合分层抽样、等距抽样等抽样方法的优点，以求提高样本代表性。

Methods 962 households in three regions of Baoding city were selected for the household survey through two stage sampling method - random cluster sampling and systematic sampling.

通过两阶段抽样方法调查保定市南市区、北市区和新市区 96 2户居民的健康状况和卫生服务利用情况。

Methods 962 households in Baoding City were selected for the household survey through two stage sampling method_random cluster sampling and systematic sampling.

通过两阶段抽样方法(随机整群抽样和系统抽样)调查了河北省保定市南市区、北市区和新市区 3个区的 962户居民的卫生服务利用情况，采用调查表的方式入户调查，并将被调查家庭分成 3组：相对贫困组、贫困临界组和一般家庭组进行公平性分析。

The apparatus further includes a quad-symbol mapper which quad-maps the systematic symbol streams to one symbol stream, a channel interleaver which independently interleaves the quad-mapped systematic symbol stream and the parity symbol streams, quad-demaps the quad-mapped systematic symbol stream, interlaces symbols in parity symbol streams, and serial-concatenates the quad-demapped systematic symbol stream to the interlaced parity symbol streams.

该设备还包括：四码元映射器，其将系统码元流四映射到一个码元流；信道交织器，其独立地交织四映射的系统码元流和奇偶码元流，对四映射的系统码元流进行四逆映射，交错奇偶码元流中的码元，并且将四逆映射的系统码元流串行连接为交错的奇偶码元流。

After the symbol-class accumulation average of every sampling point in all period of time, one time or above symbol-class accumulation average are set on every sampling point in every period of time in multi path searching window, and the result of calculation of all sampling points is stored.

完成所有时段中每个采样点的符号级累加平均运算后，对多径搜索窗口内每个采样点在时间轴上做一次或一次以上的符号级累加平均，并存储所有采样点的计算结果。

A backer of an Afghan law that critics say legalizes marital rape has rejected the international outcry as foreign meddling.

饱受批评的一项法律的拥护者说合法化的婚内暴力不会受国际舆论的干涉。

Years ago, a ancient Egyptian fleet went to the Land of punt for seeking a kind of flavor named "myrrh", and aromatic plants which has dense exotic style for the queen Hatshepsut.

3500年前的一个古埃及的舰队到&彭特之地&寻找一种叫没药的香料。