一种加快最小二乘参数估计的参数跟踪速度的措施

本文探讨了如何加快最小二乘参数估计的参数跟踪速度问题。为此目的提出了一种自动调整其“遗忘因子”值的措施。仿真计算的结果证实,所采取的这种措施是可行而且是有效的。     

Matrix equation and its application to classification of finite-dimensional estimation algebras

Under a very natural condition, a matrix equation is proved to have only trivial solution. This result is then applied to the classification problem of finite-dimensional estimation algebras, which gives a simpler proof of Tang s recent result on the constant structure of the O~matrix.     

Target estimation using MIMO radar with multiple subcarriers

This paper analyzes the effect of waveform parameters on the joint target location and velocity estimation by a noncoherent multiple input multiple output (MIMO) radar transmitting multiple subcarriers signals. How the number of subcarriers influences the estimation accuracy is illustrated by considering the joint Cramer-Rao bound and the mean square error of the maximum likelihood estimate. The non-coherent MIMO radar ambiguity function with multiple subcarriers is developed and investigated by changing the number of subcarriers, the pulse width and the frequency spacing between adjacent subcarriers. The numerical results show that more subcarriers mean more accurate estimates, higher localization resolution, and larger pulse width results in a worse performance of target location estimation, while the frequency spacing affects target location estimation little.     

浅议穿沙公路的勘测设计要点

结合沙漠地区公路测设的成功经验，指出穿沙漠公路的设计要点和沙漠公路选线的基本要求以及防风固沙的简易措施。     

2012欧洲足球锦标赛决赛阶段进球特征分析

分析了2012年欧洲足球锦标赛决赛阶段31场比赛共76个进球特征.结果表明,本届比赛进球多,前锋是最主要的得分队员,罚球区是进球的最佳区域;比赛的4660 min、7690 min时段是进球的高峰期;中路配合进攻是最有效的进球方式;脚内侧射门进球率最高,头球仍是射门进球最多的进攻方式.     

Forecasting time series with increasing seasonal variation

Four options for modeling and forecasting time series data containing increasing seasonal variation are discussed, including data transformations, double seasonal difference models and two kinds of transfer function-type ARIMA models employing seasonal dummy variables. An explanation is given for the typical ARIMA model identification analysis failing to identify double seasonal difference models for this kind of data. A logical process of selecting one option for a particular case is outlined, focusing on issues of linear versus non-linear increasing seasonal variation, and the level of stochastic versus deterministic behavior in a time series. Example models for the various options are presented for six time series, with point forecast and interval forecast comparisons. Interval forecasts from data-transformation models are found to generally be too wide and sometimes illogical in the dependence of their width on the point forecast level. Suspicion that maximum likelihood estimation of ARIMA models leads to excessive indications of unit roots in seasonal moving-average operators is reported.     

基于人类视觉系统的物体提取方案

提出了一种物体提取方案，根据人类视觉系统（ＨＶＳ）具有形状和运动两个并行通道的特点以及两者交互作用的原理，采用相对简单的图像分割和运动分割技术，将两者结合在一起，来增强对运动物体的分割处理     

Recursive estimation and forecasting of non-stationary time series

The paper presents a unified, fully recursive approach to the modelling and forecasting of non-stationary time-series. The basic time-series model, which is based on the well-known ‘component’ or ‘structuraL’ form, is formulated in state-space terms. A novel spectral decomposition procedure, based on the exploitation of recursive smoothing algorithms, is then utilized to simplify the procedures of model identification and estimation. Finally, the fully recursive formulation allows for conventional or self-adaptive implementation of state-space forecasting and seasonal adjustment. Although the paper is restricted to the consideration of univariate time series, the basic approach can be extended to handle explanatory variables or full multivariable (vector) series.     

关于绝对连续函数的黎曼-斯蒂尔切斯积分的近似计算

研究了闭区间[a,b]上的黎曼-斯蒂尔切斯（R-S）积分∫a^b f（x）du（x），对于函数f（x）和u（x）皆为绝对连续函数的情形得到了近似计算的求积公式及其误差估计，并将结果应用于富里埃正弦变换和富里埃余弦变换的近似计算及其误差分析．