MIMO-OFDM 系统中同信道干扰抑制

针对 MIMO-OFDM 系统,提出了一种最大后验概率的信道矩阵和干扰协方差矩阵估计方法,并设计了迭代求解算法。利用所估计的信道矩阵和干扰协方差矩阵,采用 IRC 接收机完成同信道干扰的抑制。利用干扰协方差阵的共轭对称与半正定等特性,提出2种干扰协方差矩阵的处理方案以提高其估计精度。第1种方案将每个子载波上干扰协方差矩阵表征为一系列时域矩阵之和,第2种方案将每个子载波上的干扰协方差矩阵用低阶模型来建模,其中模型阶数通过最小描述长度算法估计。仿真结果表明了所提方案的有效性。     

基于MATLAB的赫尔默特方差分量估计法实现

本文通过对赫尔默特方差分量估计法的理论、模型和算法的研究,应用MATLAB平台,使用MATLAB语言编写程序,开发出通用的模块,制作可视化界面,操作简单,减少了测绘工作的内业工作量,提高了工作效率,并可作为其他平差问题编程的参考,此模块具有极高的实际意义和应用价值。     

Sample Size Calculations for Precise Interval Estimation of the Eta-Squared Effect Size

Analysis of variance is one of the most frequently used statistical analyses in the behavioral, educational, and social sciences, and special attention has been paid to the selection and use of an appropriate effect size measure of association in analysis of variance. This article presents the sample size procedures for precise interval estimation of eta-squared and partial eta-squared in fixed-effects analysis of variance designs. The desired precision of a confidence interval is assessed with respect to (a) the control of expected width and (b) the tolerance probability of interval width within a designated value. In addition, sample size calculations for standardized contrasts of treatment effects and corresponding partial strength of association effect sizes are also considered.     

Estimation of a Nonlinear Intervention Phase Trajectory for Multiple-Baseline Design Data

A multilevel logistic model for estimating a nonlinear trajectory in a multiple-baseline design is introduced. The model is applied to data from a real multiple-baseline design study to demonstrate interpretation of relevant parameters. A simple change-in-levels (ΔLevels) model and a model involving a quadratic function (Quadratic) for the nonlinear intervention phase data were also estimated. In addition, a simulation study was conducted to assess Markov chain Monte Carlo estimation of the logistic model and compare its trajectory recovery with use of the ΔLevels and Quadratic models. While most of the logistic model's parameter values were recovered well, trajectory recovery was very reasonable using the simpler Quadratic model. Results are discussed along with recommendations for practitioners and directions for future research.     

Some possible effects of behaviour management training on teacher confidence and competence: evidence from a study of primary school teachers in Hong Kong

This study aims to explore the relationships between the extent and perceived quality of teachers’ experience of training in behaviour management (BM), and their awareness of the nature and extent of behavioural problems among school students, and their confidence in their own competence to deal with such problems. Teachers (n = 183) from Hong Kong primary schools were surveyed. The results showed that gender, age and whether teachers have received training had no significant influence on teachers’ awareness, conception and confidence regarding BM. A negative correlation was found between teachers’ levels of satisfaction in relation to their training experiences and their perceptions of the level of problematic behaviours among students, and the impact of students’ problematic behaviour on their teaching. A positive correlation was found between teachers’ levels of satisfaction in relation to their training experiences and their confidence in their own competence to deal with students’ problematic behaviour.     

《三国演义》中诗词的题材、体裁艺术衍论

《三国演义》全部一百二十回小说文本中,随故事情节发展,相继出现二百余首诗词作品,其题材类型多样,各类体裁形式纷呈,并大量引用前代文人咏三国时代人物之诗作入小说。这些诗词作品已经成为《三国演义》不可分割的有机组成部分,具有"以小说存诗"的版本价值和"以诗词论史"的艺术价值。     

一种改进的DV-HOP算法在WSN中的定位研究

如何能够更好的提高节点定位一直都是WSN研究的重点,本文在DV-HOP定位算法的基础上,从误差精度,锚节点稳定度和反向学习选择-最小二乘估计来对节点定位的3个方面进行改进。首先在定位误差精度中引入混沌优化算法,其次在锚节点处理中引入稳定度概念,最后在未知节点定位中引入反向学习和最小二乘估计。改进后的算法在通信半径和拓扑结构两个方面进行了仿真实验,实验表明,本文算法能够有效的减少计算带来的定位误差,提高定位精度。     

丝绸之路经济带旅游业格局与国际旅游合作模式研究

借助ArcGIS10.0工具,采用核密度估计法对欧亚非三大洲65个国家旅游资源和旅游经济的空间格局特征进行分析,发现丝绸之路经济带旅游资源分布与旅游经济发展在空间上存在较高一致性,旅游资源主要集中于西端的欧洲区和东端的亚太区,且沿海、沿河、沿交通线分布趋势明显;旅游经济发展呈现"两心三带"格局特征,海上丝绸之路和第二、三亚欧大陆桥两端的新兴经济体国家和欧洲发达国家占据主导地位。基于以上分析,本文构建了丝绸之路国际旅游经济带合作模式,并提出组建丝绸之路国际旅游联盟,打造丝绸之路国际旅游文化产业带,建设丝绸之路国际无障碍旅游区和国际旅游经济特区,搭建丝绸之路国际旅游城市网络等政策建议与措施。     

湖北省耕地资源净外部性价值量测算及财政转移支付

耕地资源既能产生生态效益,为整个社会提供生态福利,具有正外部性,同时也会因为不合理利用而损坏人类的福利,产生负外部效应。仅仅估算耕地的正外部性价值量,可能会高估耕地保护经济补偿额,不利于耕地保护政策的实施。本文以湖北省102个县(市、区)为例,分别测算了耕地的正外部性和负外部性价值量,进而得出耕地的净外部性价值量;此外,通过测算各区域内部的外部性需求量得出耕地保护的外部性盈亏水平,并据此实施跨区域的财政转移支付,以均衡各区域的发展。研究结果表明:①湖北省大部分地区的耕地对外界环境均起到了正面影响,但省内耕地资源的净外部性水平差异明显;②扣除区域内部的外部性需求量,湖北省共有41个县(市、区)耕地保护的外部性有盈余,属于财政转移支付受偿区;同时,共有61个县(市、区)耕地资源的外部性处于亏损状态,属于财政转移支付支付区;③财政转移支付行为具有一定的现实可操作性。各个县(市、区)的转移支付额占当年地方政府财政收入的比例较低,约为0.007%~5.030%,均在政府可承受的范围内。研究成果为耕地保护经济补偿政策的实施提供了一定的理论依据。     

需求不确定的再制造第四方物流网络优化研究

考虑到第四方物流再制造过程中消费区客户需求的不同,采用区间描述了客户需求的不确定性,建立了一个多目标的再制造第四方物流LRP整数规划模型。用LINGO 10进行求解,得出最优的运输方案。设计的数值算例结果验证了模型和方法的有效性。