查询词典 threshold

There are totally five chapters in the paper. Chapter 1 is the introduc-tion,and extreme value theory and methods and modelling for returns fat tails are introduced systematically in Chapter 2.This chapter also presents mean excess function and de Haan's moment estimate to decide on the reasonable exceedance threshold. Chapter 3 describes in detail non-linear time series mod-els such as GARCH models and the corresponding statistical inferences,and it also gives modelling and statistical analysis methods for returns series. Chap-ter 4 uses the models in Chapter 2 to analyzes the daily returns for Shanghai complex index and Shenzhen complex index in the Shanghai and Shenzhen stock markets. Chapter 5 applies the models in Chapter 3 to the volatility analysis of the two stock indices returns.

论文总共五章：第一章是引言部分；第二章系统介绍了极值理论方法和收益率厚尾的建模方法，给出了平均剩余函数法和de Haan矩估计相结合的方法确定合理的超越门限；第三章详细论述了非线性时间序列模型GARCH类模型及其统计推断，并且给出了收益率时间序列波动的建模和统计分析方法；第四章利用第二章的模型对国内沪深两市大盘指数上证综指和深证综指日收益率数据分布的厚尾进行了实证分析；第五章将第三章的模型应用到两个股指日收益率时间序列的波动分析。

Different aspects of the CO2 laser were studied including the variations of excitation threshold voltage and output power with discharge current.

通过研究CO2激光器的不同方面，如激励门电压和输出功率等，发现它们随着放电电流的变化而变化。

It is found that the change of threshold voltage value fits in exponential law with absorbed dose,which is caused by the effect of space charge and interface charge.

产生这种现象的原因是场效应管氧化物中的空间俘获电荷与吸收剂量近似成线性变化，对阈值电压变化和吸收剂量有近似线性的改变；而界面态对空间电荷有补偿作用，其对阈值电压的改变与吸收剂量有近似成二次方的关系。

The measured dependence of threshold current of DH lasers with temperature is found to obey an exponential law near room temperature.

测量GaAs—GaAlAs双异质结激光器阈值电流随温度的变化，表明在室温附近符合指数规律。

Not only the shortcoming that the smoothing constant and order of the model are not changed for the exponential smoothing model during the process of prediction has been overcome, but also the theory of threshold model has been further developed.

这不但克服了指数修匀模式在预报过程中修匀常数和模式形式一直不变的缺陷，也进一步发展了门限模式的理论。

And as you stand on the threshold of what is sometimes called 'real life', I want to extol the crucial importance of imagination.

在你们站在所谓的"现实生活"的起点时，我想要赞美想象力的重要。

Based on the data of concentration of harmful algae in Bohai Bay, using extreme value theory, the peak-over-threshold distribution of the algae concentration was analyzed.

基于渤海湾赤潮藻类细胞密度的连续监测数据，运用极值理论研究了藻类细胞密度的超阈值分布特性。

Combining the principle of generalized Paretodistribution fitting the tail of a distribution with compound extreme value distribution theory, this paper puts forward Poisson-GP compound threshold distribution model, and gives the results estimated by MLE, CMM and PWM respectively.

论文结合广义Pareto分布拟合底分布尾部的原理与复合极值分布理论，构建Pois(来源：A0e1e1eBC论文网www.abclunwen.com)son-GP复合超阈值分布，并给出了极大似然法、复合矩法和概率权矩法的估计结果。

Methods An unsupervised local and global features extraction method was adopted for the localization of facial features of frontal view face image. First, a threshold was used to segment the image into foreground and background, and the nose was localized by considering the symmetry of the face. Second, Harris operator was adopted to detect interest points in a rectangular area covering all the facial features, and then local maximum of the interest points were detected. And finally, Kmeans clustering method was used to cluster the points and obtain the facial features localization.

针对红外正面脸部图像，采用一种无监督的局部和全局的特征提取方法，首先通过阈值法区分出前景和背景，并根据面部特征对称性在前景中确定鼻区；然后在面部确定一个包含所有特征的矩形区域，利用Harris算子在该区域检测出角点，并找出这些点的局部最大值点；最后用Kmeans方法对这些点进行聚类。

Mystery is important. You fall in love with somebody who's somewhat mysterious, in part because mystery elevates dopamine in the brain, probably pushes you over that threshold to fall in love.

神秘感会重要的因素，部分是因为它一样会增加脑中的多巴胺，使你轻易的被对方所吸引。

Salt is good, but if the salt becomes flat and tasteless, with what do you season it?

14：33 盐本是好的，盐若失了味，可用什么叫它再咸呢？

He reiterated that the PLA is an army of the people under the leadership of the Communist Party of China.

他重申，人民解放军是在中国共产党领导下的人民军队。