最小
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The exponential distribution family and minimum error theory are brought to bear combined with fact.
针对小样本和小失效数给系统可靠性分析带来的难度,以及可靠性分布函数和参数估计的不确定性和模糊性,运用指数分布族、最小误差原理等相关理论,结合实际工程经验,对这类系统的可靠性分析提出了一种新的方法。
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By means of the projection method,adding a small disturbing function to the objective function, the penalty method, andthe gradient method, this dissertation proposes several neural networks for solvingsaddle point problems and minimum radius of ball-coverings problems, and investi-gates the stability of the proposed networks by the LaSalle invariance principle andthe Lyapunov method, so as to design neural networks which avoid getting stuck inthe local minimum.
本文针对约束鞍点问题和球覆盖最小半径的计算问题,分别利用投影法、对目标函数加上很小"扰动函数"的逼近法、罚函数法和梯度法等建立神经网络模型进行求解,并基于LaSalle不变集原理和Lyapunov直接法等工具,对模型的动态特性进行研究,从而设计出避免陷入局部极小的优化计算神经网络模型。
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This article estimates the extreme loss distribution with extreme value theory, estimates the shape parameter with HKKP estimator, which is unbiased to small sample data, selects the right threshold by selecting smallest mean square error of the estimated cumulative distribution function and empirical cumulative distribution function and based on the extreme value theory method, this article estimates the extreme loss distribution and the p-percentile operational loss under certain believe range for Chinese commercial banks, then calculates the operational risk supervise capital.
本文利用极值理论对中国商业银行操作损失极端值分布进行估计,针对尾参数估计的来用传统Hill佑计对小样本数据容易产生偏倚的情况,提出了采用Hill佑计的改进―小样本无偏估计的HKKP佑计来估计操作损失的尾参数,针对由于阈值确定不准确导致结果偏差大的情况,采用最小化估计的累计概率分布与经验累计概率分布平均平方误差的方法确定较精确的阈值,估计出给定置信水平下操作风险损失的分位数,从而使得中国商业银行操作风险监管资本的测定成为可能。
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By using the least square method and the weighted functionmethod of nonparametric estimation together, this paper defines the wavelet estimators of β and g.
本文采用了半参数估计常用的办法之一——最小二乘法结合非参数权函数估计法定义了参数分量和非参数分量的估计,这里的权函数不是通常所采用的核权函数或近邻权函数,而是由小波方法所得到的权函数,我们称它为小波权函数。
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This thesis is divided into six parts. The first chapter is preface, the current status of research in the inverse problems for parabolic partial differential equations is reported; the second chapter is "regularization methods for numerical differentiation and their applications ", in this chapter we investigate many regularization methods from a viewpoint of regularization theory and algorithm, some applications in the inverse problems for parabolic partial differential equations are given; the third chapter is "spectral regularization methods". Based on Fourier analysis, within the framework of regularization theory, we apply the spectral methods to some ill-posed problems. Many numerical experiments are done in order to show the validity of the methods; the fourth chapter is devoted to wavelet dual least squares method and a revised wavelet method; in the fifth chapter,we combine finite difference method with method of lines and apply it to the backward heat conduction problem in time; in the sixth chapter "identification problems for unknown source ", the essence and the degree of two problems related to source identification are pointed out, at the same time, some numerical methods are reported.
本文分为六个部分,第一章前言简要分析了国内外抛物型偏微分方程反问题的研究现状;第二章数值微分的正则化及其应用从正则化理论和算法的角度出发,考察了许多正则化方法,还给出了数值微分在抛物型偏微分方程反问题的一些应用;第三章谱正则化方法是在Fourier分析的基础上,在一般正则化理论的框架下,给出了这种方法在各种不适定问题中的应用,数值实验表明谱方法是有效的;第四章研究了小波对偶最小二乘方法和改进的小波方法;第五章主要研究了有限差分方法结合线方法在时间反向热传导问题中的应用;第六章是未知源识别问题,主要指出了两类未知源问题的不适定程度和不适定本质,同时报告了一些数值方法。
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Seven species of Phellinidium were reported from China. Phellinidium fragrans from Changbaishan Nature Reserve, northeastern China is newly reported for China and is characterized by its resupinate and perennial basidiocarps with fragrant odour, smallest basidiospores in the genus, and the presence of conidia in the subiculum.
摘 要:小木层孔菌属的种类在我国共有7种,其中芳香小木层孔菌Phellinidium fragrans为中国首次报道,该种发现于吉林省长白山自然保护区,与同属其它种的区别是子实体多年生、平伏、具有芳香气味,其担孢子在同属的种类中最小,菌肉中具有形状不规则的厚垣孢子。
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There were only two alternatives: take money away from the wealthiest and smallest districts and give it to the poorest and fastest-growing ones, or raise enough new revenues so that we could equalize funding without hurting the presently overfunded districts.
只有两种选择:第一,把给最富裕、最小的学区的资金转移到最贫穷、发展最快的学区;第二,重新筹措足够的费用,在不伤及拨款过多学区利益的同时,使其得到的专款与其它学区持平。
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Karyotype formula of Gossypium hirsutum L.was 2n=4s=52=30m+20m (4SAT)+2st (2SAT); and its absolute lengths of chromosomes averaged 3.40μm; arm ratio differed from 1.24 to 4.02,with the mean value of 1.77; three pairs of satellite chromosomes; the ratio of the longest to the shortest chromosomes was 2.36; and the karyotype belonged to 2B in Stebbin's classification.
陆地棉的核型公式为2n=4x=52=30m+20sm(4SAT)+2st(2SAT);染色体绝对长度平均3.40μm;臂比值最大与最小的分别是4.02和1.14,平均1.77;随体3对,分别位于第12、19和26对同源染色体的短臂上;最长与最短染色体的比值为2.36;其核型属于Stebbin的2B类型。
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"This is the fastest, most sensitive GPS chip on the market today, and among the smallest and most power efficient, making it ideally suited for use in mass market consumer electronic devices," said u-blox Chief Executive, Thomas Seiler.
u-blox 首席执行官 Thomas Seiler 表示:这款产品是现在市场上最快速、最灵敏的全球定位系统芯片,并且是最小且最省电的芯片之一,这使其非常适合在大规模消费的电子设备中使用。
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All the methods make the model more comply with the actual situation and avoid the onesidedness of single load operation condition.
根据分解协调原理,把这一复杂问题分解为最大负荷方式,一般负荷方式和最小负荷方式三个子模型,其投资费用在最大负荷方式下考虑,对于三个子模型用最大负荷损耗时间来协调统一,使得模型更符合实际情况,避免了只考虑单一负荷方式的片面性,具体求解方法采用非线性规划中的梯度法。
- 推荐网络例句
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Do you know, i need you to come back
你知道吗,我需要你回来
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Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.
1〕 杨银书,王祥生,李德昌。安徽省首次发现嗜群血蜱。
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Chapter Three: Type classification of DE structure in Sino-Tibetan languages.
第三章汉藏语&的&字结构的类型划分。