实时布料运动仿真技术

针对同时要求布料运动实时性、真实性和稳定性的应用,该文从简化布料运动仿真模型和改进积分方法着手,提供了实时布料运动仿真方法。使用该方法实现的布料仿真系统速度快、稳定性好,且易于实现。     

The largest SNR distribution

The probability distribution of the maximum of normalized SNRs (signal-to-noise ratios) is studied for wireless systems with multiple branches. Explicit expressions and bounds are derived for the cumulative distribution function, probability density function, hazard rate function, moment generating function, nth moment, variance, skewness, kurtosis, mean deviation, Shannon entropy, order statistics and the asymptotic distribution of the extreme order statistics. Estimation procedures are derived by the methods of moments and maximum likelihood. An application is illustrated with respect to performance assessment of wireless systems.     

Some Geometric Methods for Constructing Decision Criteria Based On Two-Dimensional Parameters

This paper reviews two types of geometric methods proposed in recent years for defining statistical decision rules based on 2-dimensional parameters that characterize treatment effect in a medical setting. A common example is that of making decisions, such as comparing treatments or selecting a best dose, based on both the probability of efficacy and the probability toxicity. In most applications, the 2-dimensional parameter is defined in terms of a model parameter of higher dimension including effects of treatment and possibly covariates. Each method uses a geometric construct in the 2-dimensional parameter space based on a set of elicited parameter pairs as a basis for defining decision rules. The first construct is a family of contours that partitions the parameter space, with the contours constructed so that all parameter pairs on a given contour are equally desirable. The partition is used to define statistical decision rules that discriminate between parameter pairs in term of their desirabilities. The second construct is a convex 2-dimensional set of desirable parameter pairs, with decisions based on posterior probabilities of this set for given combinations of treatments and covariates under a Bayesian formulation. A general framework for all of these methods is provided, and each method is illustrated by one or more applications.     

物流国内生产总值的统计方法和结果

统计物流的国内生产总值面临许多问题,其中对GDP定义和物流定义的理解是主要问题。根据国家关于物流定义的标准,按照物流的特点,提出物流国内生产总值的统计方法,得出历年中国物流国内生产总值及其占中国GDP的比值。     

统计工程与21世纪统计教育的思考

21世纪是世界各国进行高科技战略决战的世纪。信息技术是核心,统计技术的工程化将给21世纪的科技发展提供技术高科技。20世纪中期,6-δ的统计管理技术将日本带入了经济发达大国。21世纪初,中国能否应用统计工程技术也能进入世界发达国家的行列?文章旨在统计工程化的技术分析中为统计知识体系创新提出了个人的理解,并对统计工程与未来科技发展的关系,特别是21世纪的统计教育提出了新的见解。     

基于积分校正网络算法的直流电机调速控制研究

直流电机作为一种执行机构越来越广泛的应用在机电控制的各个领域。为提高直流电机的调速性和转速稳定性，将积分校正网络算法应用于直流电机控制器的设计，运用MAT-LAB的SIMUHNK软件构建了直流电机调速控制系统，并进行了计算机仿真。仿真结果表明，控制系统具有较好的稳态性能与瞬态性能。     

混凝土损伤的非线性细观统计模型

本文利用概率统计的方法，把以体积应变定义的混凝土损伤非线性变形用随机分布裂缝的几何特征尺寸形式给出，并以界面位移跃度解作为对结合缝开裂的描述。计算表明。由于该模型接近混凝土实际结构，对混凝土非线性的描述也具有相当的精度。     

ON CHARACTERIZING DISTRIBUTIONS VIA LINEARITY OF REGRESSION FOR ORDER STATISTICS

Let X₁X_n be a random sample from an absolutely continuous distribution with the corresponding order statistics X_1:n≤X_2:n≤X_n:n. A complete solution of the problem, posed in 1967 by T. Ferguson, of determining the distribution by linearity of regression of X_k+2:n with respect to X_k:n is given. The only possible distributions are of the exponential, power and Pareto type. A linear regression relation for exponents of order statistics is also considered.     

单摆周期的数值计算

本文用数值积分的方法计算了单摆的周期,给出了在不同振幅(摆动的最大角度)下单摆的周期值,由此可见单摆的周期是随着振幅的增大而增大的.只有在振幅很小的情况下它才近似的等于一个常数.     

On the Fisher–Bingham distribution

This paper primarily is concerned with the sampling of the Fisher–Bingham distribution and we describe a slice sampling algorithm for doing this. A by-product of this task gave us an infinite mixture representation of the Fisher–Bingham distribution; the mixing distributions being based on the Dirichlet distribution. Finite numerical approximations are considered and a sampling algorithm based on a finite mixture approximation is compared with the slice sampling algorithm.