一种适用于无线ATM通信的差错控制方案

研究了无线ＡＴＭ通信的差错控制方案，提出了应根据多媒体业务类型、速率等参数，以及移动环境等，自适应地选择合适的差错控制技术和参数的思想。文中提出的差错控制方案主要包括ＦＥＣ（可变深度的交织、卷织码、ＢＣＨ码）和限时／非限时ＳＡＲＱ等技术，计算机仿真结果表明了所提方案的有效性。     

The selection of zero-non-zero patterned cointegrating vectors in error-correction modelling

An effective and efficient search algorithm has been developed to select from an 1(1) system zero-non-zero patterned cointegrating and loading vectors in a subset VECM, B^q(l)y(t-1) + B^q-1 (L)Ay(t) = ε( t ) , where the long term impact matrix Bq(l) contains zero entries. The algorithm can be applied to higher order integrated systems. The Finnish money-output model presented by Johansen and Juselius (1990) and the United States balanced growth model presented by King, Plosser, Stock and Watson (1991) are used to demonstrate the usefulness of this algorithm in examining the cointegrating relationships in vector time series.     

为《陈垣年谱配图长编》补遗指谬

《陈垣年谱配图长编》是一部严谨有加的学术著作。较缺乏，因此，该书不可避免地出现了个别遗漏和失误之处。臻完善，更具有使用价值。因为历史年代跨度较大，20世纪早期的文献史料又比为此，运用新发现的史料，为该书补遗、指谬，使之更     

Bias Reduction through First-order Mean Correction, Bootstrapping and Recursive Mean Adjustment

Standard methods of estimation for autoregressive models are known to be biased in finite samples, which has implications for estimation, hypothesis testing, confidence interval construction and forecasting. Three methods of bias reduction are considered here: first-order bias correction, FOBC, where the total bias is approximated by the O(T^-1) bias; bootstrapping; and recursive mean adjustment, RMA. In addition, we show how first-order bias correction is related to linear bias correction. The practically important case where the AR model includes an unknown linear trend is considered in detail. The fidelity of nominal to actual coverage of confidence intervals is also assessed. A simulation study covers the AR(1) model and a number of extensions based on the empirical AR(p) models fitted by Nelson & Plosser (1982). Overall, which method dominates depends on the criterion adopted: bootstrapping tends to be the best at reducing bias, recursive mean adjustment is best at reducing mean squared error, whilst FOBC does particularly well in maintaining the fidelity of confidence intervals.     

“买地券”录文札记十则

买地券作为一种随葬明器,是非常宝贵的碑刻材料.从买地券所保留的文字而言,或因文字有所磨泐而漫漶不清,或俗讹字形近字较多,或用典使事、言辞深奥等原因,致使已经刊出的许多买地券在文字释读上存在不当之处.笔者尝试加以指正.     

社区矫正——刑罚执行方式新形式

社区矫正在我国已经进行了几年的试点工作，期间取得了一定的探索性成就，但是在观念、立法及实践方面都存在诸多亟待解决的问题。我国现阶段应当立足于实际情况，在地方法规、规章中对于执行主体专门化、工作人员专业化及健全矫正方法等方面进行完善，来指导试点工作，并在实践中加强宣传、建立配套的矫正工作人员的选拔与培训制度，以期建立一个为社会公众所认可的科学、合理的中国特色的社区矫正制度。     

农业生产与经济增长关系的均衡分析

为探讨我国农业生产与经济增长之间的关系,选取1978-2006年我国历年农业产值和国内生产总值序列进行协整检验,结果表明我国农业生产与经济增长之间存在着长期稳定的动态均衡关系,农业产值每增加1%,将促进经济增长2.12%;误差修正模型表明,农业生产的短期变化对经济增长有显著的正效应,如果本期的经济增长偏离长期均衡值,那么到下一时期这一偏离度将有8%得以纠正;Granger因果关系检验表明,农业生产对经济增长具有短期效应,经济增长对农业生产具有长期促进作用;脉冲响应函数分析和方差分解的结果进一步表明,农业生产对经济增长的贡献较显著。     

东坡用典指谬

东坡学富才高,喜用典故,但疏于查对,舛误不少,确实有碍解读。本文通过考查相关文献史料,对所见东坡用典失误之处进行了辨别订正。     

关中方言背景的英语语调偏误分析及纠正策略

母方言语调对英语语调的学习具有负迁移作用。通过对关中方言背景英语学习者的英语语调采录与分析,发现这些学习者的英语语调偏误与其母方言语调明显相关,表现为音长过长、轻重不分、调域偏窄等。因此,在强化连读式、弱读式、变读式等语流音变意识以的同时,克服以双音节为标准节奏来缩短音长;克服重音节拍受音节节拍的影响来区分轻重;以及克服语调结构和类型不受声调局限来扩宽调域,是学习者纠正语调偏误的主要策略。     

Combinatorics and Statistical Issues Related to the Kruskal–Wallis Statistic

We explore criteria that data must meet in order for the Kruskal–Wallis test to reject the null hypothesis by computing the number of unique ranked datasets in the balanced case where each of the m alternatives has n observations. We show that the Kruskal–Wallis test tends to be conservative in rejecting the null hypothesis, and we offer a correction that improves its performance. We then compute the number of possible datasets producing unique rank-sums. The most commonly occurring data lead to an uncommonly small set of possible rank-sums. We extend prior findings about row- and column-ordered data structures.