关于单边检验教学中一个问题的讨论

本文对《概率统计》课程中关于单边检验的一个例题所反映的问题进行了讨论,并且建议,统一现行教材中关于单边假设的各种提法。     

基于不同静态性能模型的热成像系统视距估算

 基于NVL75，FLIR92和CFLIR国内外3种不同的热成像系统静态性能模型，采用静态性能参量MRTD建立对面目标的视距估算方程，并通过CFLIR40软件计算，比较不同模型下视距估算结果，得出：凝视型热成像系统在CFLIR模型下计算得到的MRTD值比FLIR92模型计算得到的MRTD值更接近实际测量值；在基本参数相同的条件下，利用MRTD估算的凝视系统的视距远远优于扫描系统的视距；对凝视型系统，从视距估算的结果来看，CFLIR模型略优于FLIR92模型。     

两个同课异构案例引发的思考

1案例呈现案例1(1)引入新课教师:先来看一个古代小故事:王戎7岁时,与小伙伴们外出游玩,看到路边的李树上结满了果子,伙伴们纷纷去摘取果子,只有王戎站在原地不动.王戎说:"树在道边而多子,此必苦李."小伙伴尝了一下,果然是苦李.请问在这个故事中,王戎的分析思路是怎样的?(学生口述,教师板书)学生1:王戎的分析思路是:假设"李子是甜的"(?)得到"树在道边则李少"结论(?)与已知"树在道边而多子"矛盾(?)假设"李子是甜的"不成立(?)王戎"此必为苦李"正确.教师:非常好!下面请同学们举出生活中用反证法说理的例子并完成下面几个问题:1)四个苹果放在三个抽屉中,必有两个苹     

Maximum likelihood polynomial regression for robust speech recognition

The linear hypothesis is the main disadvantage of maximum likelihood linear regression (MLLR).This paper applies the polynomial regression method to model adaptation and establishes a nonlinear model adaptation algorithm using maximum likelihood polynomial regression(MLPR)for robust speech recognition.In this algorithm,the nonlinear relationship between training and testing Gaussian means in every Mel channel is approximated by a set of polynomials and the polynomial coefficients are estimated from adaptation data in test environment using the expectation-maximization(EM)algorithm and maximum likelihood(ML) criterion.The experimental results show that the second-order polynomial can approximate the actual nonlinear function better and in noise compensation and speaker adaptation,the word error rates of MLPR are significantly lower than those of MLLR.The proposed MLPR algorithm overcomes the limitation of linear hypothesis well and can decrease the impact of noise,speaker and other factors simultaneously.It is especially suitable for joint adaptation of speaker and noise.     

带权Laplacian方程解的最优梯度估计

设M为n维完备无边界的流形,它的Ricci曲率有下界-K,这里K为实常数.假设M上的向量场B满足|B|≤γ且(△)B≤K*,这里γ为非负常数,K*为实常数,则带权Laplacian方程△u Bu=0任意正的光滑解满足最优梯度估计|(△u)|2/u2≤m(K K*) mγ2/m-n,其中任意常数m＞n.     

玉米叶片形态的数值模拟

本论文通过实际测定的玉米型态数据,采用数值分析方法进行数值模拟,建立了玉米叶片及植株形态的数学模型,并应用模型绘出了叶片主脉及边缘的三次样条拟合合成效果图.     

Logistic型方程周期解和概周期解的存在性

In this paper, we study the Logistic type equation x= a（t）x -b（t）x^2＋ e（t）. Under the assumptions that e（t） is small enough and a（t）, b（t） are contained in some positive intervals, we prove that this equation has a positive bounded solution which is stable. Moreover, this solution is a periodic solution if a（t）, b（t） and e（t） are periodic functions, and this solution is an almost periodic solution if a（t）, b（t） and e（t） are almost periodic functions.     

Computer simulation of intravascular ultrasound plaque images

A method is proposed to simulate intravascular ultrasound （IVUS） images of athero-sclerotic plaques. To accomplish the simulation of static IVUS plaque images, the ringdown and guidewire artifacts are introduced into the polar image-formation model （PIFM）, and the fibrous, lipid and calcific contents are synthesized in plaques respectively. The simulation of sequential IVUS images can be achieved by utilizing characteristics of the pulsatile artery. The results on static images demonstrate that it outperforms the PIFM method by 56.9% in terms of the correlation coefficient （CC）, and 24.3% in terms of the mutual information （MI）. The results on sequential images demonstrate that it outperforms the PIFM method by 51.0% in terms of CC, and 10.3% in terms of MI.     

对流流体中表面波的非线性发展方程的显式精确行波解

该文用直接代数方法和假设方法的一种结合得到了对流流体中表面波的非线性发展方程 u     

基于跳扩散模型的资产证券化定价

把跳扩散过程引入到资产证券化的定价中，假设资产池中的第n个资产价值变化遵循dVn／Vn=（μn=λμπ）dt＋σndWn＋πdyt，给出了定价公式和蒙特卡洛模拟算法．与国内外现行的定价方法相比，理论上综合考虑了各资产的财务状况和外部金融环境对违约的影响，又便于实际计算．