因子模型

And in order to improve the performance of the networks, the network parameters such as normalized function, the number of the hidden layers and neurons in each hidden layer, learning rate and smoothing parameter are studied.

为了改善模型的预测精度，对归一化函数、隐层数、隐层神经元数及学习因子和惯性因子等模型结构方面的问题进行了探讨。

In order to improve the statistical accuracy, we proposed an adaptive model based on context and features of audio coding. Using our proposed model, the scalefactors of current frame are represented with the statistical distribution of the N preceding frames.

为了进一步挖掘自适应模型的潜能，针对音频编码的特点，我们提出了一种基于上下文的自适应模型，利用当前帧前面N帧已编码的比例因子的概率分布来对当前帧的比例因子进行编码。

In the evaluation, we find that in order to achieve a high and appropriate correct classification rate, the cutoff should be selected by trading off tyeⅠerror rate and the typeⅡerror and efforts should be made to reduce the potential cost of two types of errors to the decision-maker.

结果显示，在jackknife method方法下包含了多因素因子的模型对经营困境的分类识别能力比单独使用财务变量因子的模型有较大增强，说明非财务变量包含了与经营困境有关的重要信息。

Kalidium foliatum community were built. Comparison between the monthly and the accumulative model shows that the advantage of monthly model over accumulative model in three aspects. Firstly, the monthly model is much more accurate.

与传统的累积气候因子回归模型相比，逐月回归模型在3个方面更具优势，即模拟结果更精确，可以揭示气候因子影响植物生长的重要细节，具有预测能力等。

This paper mainly studied the price fixing of derivative securities under the random interest rate model which applied stochastic differential equations on the basis of option pricing theory and the model of derivative securities pricing, several majo

在双因子Vasicek随机利率模型下给出了折价债券满足的偏微分方程和债券定价公式，通过分析到期收益率与远期利率的动态变化过程，推导出双因子Vasicek随机利率模型下折价债券买权和卖权的定价。

Rice production system is a complex system,based on the relationship of crop,environment,and technique,a rice management knowledge model made the management knowledge be presented modally and digitally.

水稻生产系统是复杂的多因子系统，基于水稻生育指标-环境因子-技术措施关系构建的水稻管理知识模型，初步实现了水稻管理知识表达的模型化和数字化。

In this thesis, several problems of time-dependent systems in various branches of physics are investigated by making use of the generalized invariant theory and the invariant-related unitary transformation formulation. The problems are given as follows:(1) Spin model and geometric phase factor in the fiber We investigate the fiber experiment performed by Chiao-Tomita and the Chiao-Wu theory concerning the geometric phase factor in the optical fiber, and then show that the investigation of the propagation of photons inside the noncoplanar optical fiber can be regarded as that of a second-quantization spin model.

本论文用推广的不变量理论和与不变量有关的幺正变换方法研究了一些物理分支中的几个含时系统问题：(1)自旋模型与光纤中光子几何相因子问题重新考察了Chiao-Tomita光纤实验和Chiao-Wu关于光纤中光子几何相因子的理论，证明了在非共面弯曲光纤中传播的光子运动问题实际上可以化为二次量子化含时自旋模型研究。

Then, concerning the difficulty of ascertaining hysteresis time of piezometric tube, Genetic Algorithm-Radial Basis Function Neural Network model is developed according as the method that reservior level is rectilinear correlation with piezometric tube level, which not only could be calculated by computer but also is showed logical and feasible.

针对以往监测模型预测精度难以保证的的问题，本文在分析比较了几种土石坝安全监测预报模型的基础上，提出了一种新的安全监测预报模型——遗传回归模型，该模型通过遗传染色体对建模因子进行优选，并在适应度函数中综合考虑模型拟合精度与预测精度平衡。

The direct relationship between the strength coefficient of fly ash and main factors,such as the pozzolanic activity index,content of fly ash,water binder ratio and curing age,is given.

提出了粉煤灰强度效应因子k的动态预测模型，该模型建立了粉煤灰强度效应因子与粉煤灰火山灰活性指数、粉煤灰掺量、水胶比、龄期等主要参数之间的直接联系，并考虑了粉煤灰品种、水泥品种等其它因素的影响。

The CVD is an important index to indicate tree diameterdifferentiating.On basis of dynamic change and tendency of CVDamong trees in stand,three models of square CVD are proposed.i.e.,basic model,stand factor model,and thinning effects model.All threemodels are of mechanism,asymptotic characteristic,and invariance forprojection length.Futhermore,there are compatiability and extremevalues in thinning effects model for thinned and unthinned stands.

直径变动系数是描述林木直径分化的重要指标，根据林木直径变动系数的动态变化和趋势，本文提出了直径变动系数平方动态变化的三个模型：基本模型，与林分因子相关的模型，考虑间伐效应的模型，上述三个模型均具有一定的机理性、渐近性和步长不变性，特别是考虑间伐效应的模型为间伐林分和未间伐林分的相容性模型，它还具有相容性和极值性。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。