A data warehouse is a subject oriented, integrated, steadied, time variant collection of data to support management decisions.
数据仓库是面向主题的、集成的、稳定的、包含历史数据的数据集合，用以支持经营管理中的决策制定过程。
Experiments show that the multiresolution analysis of wavelet transform is an effective new method for processing unstable signals having time variant spectra.
实验结果表明，小波变换的多分辨率分析对于分析处理具有时变谱特性的非平稳信号是一种新的有效方法。
The channel model is a linear time variant system.
信道模型为一线性时变系统。
The robust stability condition of periodic time variant system is derived.
推导了周期时变系统的鲁棒稳定性条件。
It can be time-invariant or time variant, causal or non causal, linear or nonlinear.
它可以是时不变的或时变的、因果的或非因果的、线性的或非线性的。
The seismic signal acquired in the field is a complex of different waves and a time variant non stationary signal.
野外采集的地震信号是多种波的复合体，是一种时变的非平稳信号。
Vibration response signal of impulse fault is generally time variant. It is difficult to early detect and diagnose by means of traditional methods.
冲击故障的振动响应信号是时变的，用传统的诊断方法一般难以进行早期发现和诊断。
At the same time, based on the knowledge of digital signal processing, reconstruction by harmonic correction and time variant digital filter was proposed.
与此同时，结合数字信号处理知识，分别用谐波修正和时变数字滤波器的方法，完成基于骨导信号的语音重构。
The doppler signal that is mixed and exported by microwave interferometer is a non-stationary signal, its instantaneous frequency is changing time variant.
微波干涉仪混频输出的多普勒信号是一个非平稳信号，其瞬时频率随着时间的变化而变化。
The method can realize time variant merging automatically, result in simultaneous corrections both for phase and amplitude and avoid the influence of noise.
此方法可自动实现时变拼接，达到相位和振幅同时校正，而且能避免噪声的影响。
In order to improve the prediction accuracy, a rolling learning-prediction procedure was introduced to deal with the time variant property of the bioprocess.
为了提高预报精度，引入滚动学习预报技术处理过程的时变性。
With the subaperture method, data rate and radar transmit peak power can be effectively reduced, the time variant of Doppler center frequency can be resolved.
通过子孔径方法，可以有效降低数据率及雷达发射峰值功率，并可解决多普勒中心频率的时变问题。
In this case, a kind of status observer dealing with the time variant delay is designed, and two control strategies are investigated in terms of the network load.
本文针对这种情况，设计了一种能够处理时变延迟的状态观测器，并根据网络负载的不同变化情况，提出了两种不同的控制策略。
The macro model of traffic flow in freeway is a high order, nonlinear and time variant system which makes the problem of its identification become very difficult.
高速公路交通流模型是一个高阶非线性时变系统，这使得该模型的辨识问题成为一个非常困难的问题。
The merging of 3 D seismic data can be looked as the issue of optimum in different scale space mathematically, the key is how to realize the time variant merging.
三维地震资料拼接可看作是一个不同尺度空间的数学寻优问题，其关键在于如何实现时变拼接。
They have superiority in the uncertain model and non-linear system and time variant system control, due mostly to their being independent of precise mathematical model.
对于模型未知的复杂非线性系统或是动态特性常变的控制对象，两者的不依赖精确数学模型的控制特性具有无可比拟的优势。
Vibration signals borne by different main bearing clearances are not stationary and time variant. It is difficult to early detect and diagnose by means of traditional methods.
内燃机曲轴轴承所受到的冲击信号是非平稳、时变信号，用传统的诊断方法难以进行故障的早期发现和诊断。
The detection performance of matched filter will be degraded and the errors of estimated parameters of matched filter will be increased in a randomly space-time variant channel.
水声信道的随机时变特性使得匹配滤波器的检测性能下降，参量估计误差增大。
This paper presents the time domain analysis of three orders discrete system by power series, which can study not only the time invariant system, but also the time variant system.
利用幂级数的方法，对三阶线性离散系统进行时域分析，其方法不仅可以研究线性非时变离散系统，而且还可以研究线性时变离散系统。
It varies with time and the reliability analysis considering corrosion is time variant reliability, while the model of the corrosion affects the reliability analysis significantly.
大气腐蚀是造成钢结构损伤的一个主要因素，并且是随时间渐变的，其可靠性分析属于时变可靠性的范畴，而腐蚀模型在其中起重要的作用。
Although the filtering method in frequency domain can solve the time variant filtering problem based on Fourier transform, the method may appear a false anomaly in conjunct part between Windows.
频率域滤波方法虽然可解决时变滤波问题，但这种方法是基于傅里叶变换，在窗口与窗口之间的接合部位会出现假异常。
However since VWV system is multivariable, strongly coupled, nonlinear and time variant, its design performance and management are more difficult than constant flow chilled water volume system's.
但是变水量空调系统具有多变量、强耦合、非线性、时变的特点，其运行和管理相对于定水量系统难度大些。
Variable air volume conditioning system is multivariable, strongly coupled, nonlinear and time variant, so its design, performance are more difficult than constant air volume conditioning system.
变风量空调系统具有非线性、多变量、强耦合及时变等特点，所以变风量空调控制系统的设计和运行的难度比定风量空调系统要大。
Time variant motion model can increase the efficiency of the RJ-MCMC algorithm, reduce the number of ineffective particles, and enable it convergence to the real value faster.
时变的运动模型可以有效提高RJ -MCMC方法的效率，减少其无效的粒子点数，使其能更加快速地收敛到真实值。
Time variant multipath propagation in acoustic channel causes serious intersymbol interference (ISI), which makes high speed data transmission over acoustic channel very difficult.
但水声信道的时变多途效应造成接收数据严重的码间干扰（I S I），使得高速水声通讯的实现十分困难。
Based en a wavelet ridge algorithm, a novel approach is presented for extracting time-variant oscillation performance from data measured by phasor measurement units.
基于小波脊算法，提出了从相量测量装置的实测数据中提取电力系统时变振荡特性的新方法。
A new method for the design of linear time-variant recursive digital filters is proposed in this paper.
提出了设计线性时变递归数字滤波器的一种新方法。
Tension control is a very complex process which is random, time-variant and coupling.
张力控制过程是一个具有随机性、时变性和耦合性的复杂过程。
DC-DC switching converter is a time-variant and non-linear dynamic system, and it is difficult to analyze and design.
DC开关变换电路是一个时变的、非线性的动态系统，它的分析与设计一直是一个难题。
DC-DC switching converter is a time-variant and non-linear dynamic system, and it is difficult to analyze and design.
DC开关变换电路是一个时变的、非线性的动态系统，它的分析与设计一直是一个难题。
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