Asymptotics for Panel Models with Common Shocks

This article develops a novel asymptotic theory for panel models with common shocks. We assume that contemporaneous correlation can be generated by both the presence of common regressors among units and weak spatial dependence among the error terms. Several characteristics of the panel are considered: cross-sectional and time-series dimensions can either be fixed or large; factors can either be observable or unobservable; the factor model can describe either a cointegration relationship or a spurious regression, and we also consider the stationary case. We derive the rate of convergence and the limit distributions for the ordinary least square (OLS) estimates of the model parameters under all the aforementioned cases.     

Lp convergence and complete convergence for weighted sums of AANA random variables

Let {X_n, n ? 1} be a sequence of asymptotically almost negatively associated (AANA, for short) random variables which is stochastically dominated by a random variable X, and {d_ni, 1 ? i ? n, n ? 1} be a sequence of real function, which is defined on a compact set E. Under some suitable conditions, we investigate some convergence properties for weighted sums of AANA random variables, especially the L^p convergence and the complete convergence. As an application, the Marcinkiewicz–Zygmund-type strong law of large numbers for AANA random variables is obtained.     

变号级数的一个新判敛法

本文讨论关于变号级数的突破单调性条件要求的判别法.     

二相编码非相参积累特性的研究

本文从抗信号载获出发,研究了具有大时宽带宽积的二相编码序列波形,确立了以雷达“MT1-脉冲压缩-非相参积累”处理方案相结合的信号波形优化准则.根据这一信号波形优化准则,在计算机(?)量模块拟研究基础上,给出了码长 P=127的二相编码序列波形优化实例.当回波引入多普勒频移 f_d在0～10 kHz 变化时,这种信号的非相参积累输出,其主付比均达到实用要求,这种信号又容易实现脉间波形捷变,使信号具有良好的抗干扰和抗截获获能力,满足了中程搜索雷达对信号的要求.     

线虫和酵母基因组中简单串联重复序列的统计分析

本文分析了线虫和酵母基因组中1—3核苷酸的串联重复序列，对比这样的序列在内含子、外显子和基因间区域的分布情况，发现不同的重复模式在不同区域的重复特点各不相同，尤其是三核苷的重复在编码区和非编码区中的分布有显著的差异，在外显子中AAG模式的重复占优势，在内含子和基因闻序列中AAT模式的重复占优势，CCG模式的重复在任何序列中均罕见．     

The Minimal Spanning Tree Preservation Approaches for DNA Multiple Sequence Alignment and Evolutionary Tree Construction

In this paper, we propose a new criterion, namely the minimal spanning tree preservation approach, for both of the DNA multiple sequence alignment and the construction of evolutionary trees. It is our aim to keep the proximity information among the sequences or species via our approach. The basic idea behind this approach is that those distances among species which are close to one another are more informative than the others.     

GM(1,1)模型时间响应函数的最优化

GM(1,1)是灰色系统理论的核心内容之一。本文利用"最小二乘法"确定GM(1,1)白化权函数的时间响应函数中的常数C,从而构建了GM(1,1)的时间响应函数的最优模型。经大量的数据模拟和与GM(1,1)对比,发现优化的GM(1,1)模型的模拟精度和预测精度均较高。     

汉语表顺序关系的义素系统的封闭性

汉语表示特定顺序关系义位的义素只有3个,这三个义素分别表示义场、起始点、顺序或级别。     

中国城市广场发展的脉络

城市广场是城市空间的重要构成要素之一,是城市的"客厅"和"起居室"。伴随着城市建设的深入,城市广场已成为一个包容市民休闲活动、承载城市文脉的重要场所之一。本文从历史的角度,对中国城市广场的发展过程及脉络进行了初步探讨与分析。     

Analogues of Khintchine, Marcinkiewicz–Zygmund and Rosenthal Inequalities for Symmetric Statistics

In this paper we prove the analogues of Khintchine, Marcinkiewicz–Zygmund and Rosenthal moment inequalities for symmetric statistics of second order in not identically distributed random variables.