查询词典 estimation

In this paper, the Householder orthogonal transform algorithm is used to solve the problems of power system state estimation.

本文提出用豪斯霍尔德正交变换算法，求解电力系统的状态估计问题。

In this paper, a novel Hurst index estimation method based on the DFGN model and wavelet analysis is proposed.

为此提出了一种新的基于小波变换和分数高斯噪声模型的Hurst指数提取方法。

The estimation of Hurst index from noisy fractal signals is an important problem.

分形信号中Hurst指数的提取是一个十分重要的研究方向。

Estimation of hydrate concentration is one of the basic aims for the study of seismic attributes.

水合物地震属性研究的一个基本目标是水合物/游离气含量的估算。

Based on the mentioned above ideas, it describes a method to determine the parameters involved in the hydrologic models when considering the effect of human activity on runoff. By the approach, the runoff is more clearly revealed. The concept of pattern unit hydrograph and its estimation method are presented.

基于上述思想，阐述了考虑人类活动影响的流域水文模型参数的确定方法，将人类活动影响纳入流域水文模型参数的确定过程中去，可以更深刻地了解流域水文的基本规律，揭示人类活动对其径流的影响。

Design flood estimation is the key content and important part of engineering hydrology.

设计洪水计算是工程水文学的核心内容和重要组成部分。

The hyperbolic function is used to built the attractor estimation algorithm of non—linear cointegration and the related cointegration testing method is put forward.

利用双曲迭代函数系理论，给出了非线性协整吸引子的估计算法，并提出了相应的协整关系存在性检验的方法。

Because the weights are determined by the correlation of code sequence and estimation error of channels, which can be nearly determined by system load factor, we determine the sub-optimum weights by system load factor through simulations, and substitute the hard-decision symbol function by soft-decision hyperbolic tangent function to decrease the risk of error decision.

由于加权因子取决于前级符号估计的可靠性。也就是取决于扩频码互相关系数与信道估计精度，在随机扩频系统中，估计精度可近似由系统负荷决定，因此可根据系统负荷决定加权因子，以很小的性能降低代价换取计算量的极大降低。同时，为进一步降低误判风险，使用带有斜率控制因子的双曲正切函数代替常规的符号函数。

At first, with the low-frequency data measured, three of the LRE fault detection systems for the real-time condition are proposed using the nonlinear identification technology of the BP neural network, the state estimation technology of the dynamic neural network, and the pattern recognition technology of the fuzzy hypersphere neural network. The learning algorithms of the BP and dynamic neural network are researched at the same time. Furthermore, while the engine operation is divided into the start and steady-state processes, the real time ability, the response time, the accuracy, the robustness, the sensitivity and the monitoring parameter optimization are studied. In the test data analyses of the YF-75 engine, the detection system correctly carried out for all normal tests, and in the three abnormal tests the engine faults were accurately forecasted.

首先，基于低频测量数据，采用BP神经网络的非线性辨识技术、动态神经网络的状态估计技术及模糊超球神经网络的模式识别技术，提出了三种发动机故障实时检测系统；同时研究了BP神经网络和动态神经网络的学习算法；另外还把发动机工作分为启动过程和稳态过程，分别讨论了神经网络故障检测系统的实时性、及时性、准确性、鲁棒性、敏感性及参数优化问题；在YF-75发动机试车数据分析中，不仅全部正确地监测了正常试车过程，而且准确地预报了三次异常试车中的发动机故障。

Then we study the channel estimation methods in fast varying wireless channel and various ICI suppression measures.

然后研究了快速时变信道下的信道估计方法，以及抑制消除ICI的各种方法。

Researches reveal that students who suffer from corporal punishment tend to resort to violence in their future life.

研究表明遭受过肉体惩罚的孩子倾向于在他们今后的人生中使用暴力。

Total sugar of sarcocarp and chlorophyll of pericarp increased firstly, and then decreased afterward along with altitude; Titratable acidity, ascorbicacid and anthocyanin of pericarp were increased along with altitude; The content of protein increased firstly and decreased afterward along with altitude; Carotenoid of pericarp were decreased along with altitude.

果肉总糖和果皮叶绿素含量随海拔高度升高先升高后降低；可滴定酸、维生素C和果皮花青苷含量均随海拔升高而升高；蛋白质在1720m处最大，1420m处最小；果皮类胡萝卜素随海拔升高而降低。