刚体转动渐进跟踪控制的逆系统方法

逆系统方法是以非线性控制为目的,以直接分析为途径,以动态系统的逆概念为核心。该文将逆系统方法应用于刚体动力学中,运用非线性控制的逆系统方法设计Euler动力学方程的控制器,通过对一个陀螺的外力矩进行实施控制,使刚体在动坐标系下的角速度稳定跟踪指令,来实现对刚体转动的渐进跟踪控制。     

一种非刚体目标的实时检测与跟踪算法

提出了一种复杂背景下自动、实时地检测和跟踪非刚体目标算法。该算法利用自适应的背景减除方法,在复杂背景条件下提取出运动目标;采用颜色直方图模型为特征的均值平移法作为跟踪算法。试验结果验证了该算法的实时性和有效性。     

《信息系统分析与设计》课程的教学探索

随着信息技术的发展,信息系统分析、设计、构建、维护和管理的知识与能力已成为高校信息类和管理类专业学生的基本素质要求。本文主要总结分析了《信息系统分析与设计》课程的教学目的、教学内容、教学进度、教学模式,并介绍了在该课程教学改革中采取的措施与方法。     

高校创新型外语人才的时代特质与培养机制

培养创新型外语人才是知识社会的时代诉求。是高校外语教育建设创新型国家的历史使命。我国创新型外语人才培养的分层次特色培育模式及其未来走势．把培养高水平创新型外语人才定位为高校外语教育的永恒追求。高水平创新型外语人才的培育。是一项系统工程。建立由高校外语教师“我”系统的白循环机制和“我-你”世界双轨互动运行的外循环机制组成的双轮驱动机制．是高校外语教育培养高水平创新型外语人才的现实抉择。     

基于有效预测区域的模糊数据关联

多目标多传感器跟踪系统由数据关联和目标状态估计两部分组成,数据关联是多目标跟踪系统研究的核心。数据关联和目标状态估计两部分既有一定的独立性又有密切的联系,而将两部分合理地结合对提高跟踪系统的性能是重要的。该文以跟踪目标的有效预测区域为依据,利用基于Mahalanobis距离的模糊均值聚类方法解决数据关联问题,在一定程度上将数据关联和目标状态估计两个不同的过程相结合,仿真计算说明了其有效性。     

Target detection from a classical and a Bayesian viewpoint

Two approaches have been used for designing spatial surveys to detect a target. The classical approach controls the probability of missing a target that exists; a Bayesian approach controls the probability that a target exists given that none was seen. In both cases, information about the likely size of the target can reduce sampling requirements. In this paper, previous results are summarized and then used to assess the risk that Roman remains could be present at sites scheduled for development in Greater London.     

试析汉英过渡语

过渡语是第二语言习得中一个重要的概念。文章探讨了过渡语和汉英过渡语的定义,分析了汉英过渡语的产生与构成,比较深入地剖析了汉英过渡语与汉语和英语之间的关系,总结了汉英过渡语的性质和特点,最后指出了汉英过渡语对外语教学的启示。     

Does Iconicity in Pictographs Matter? The Influence of Iconicity and Numeracy on Information Processing,Decision Making,and Liking in an Eye‐Tracking Study

Researchers recommend the use of pictographs in medical risk communication to improve people's risk comprehension and decision making. However, it is not yet clear whether the iconicity used in pictographs to convey risk information influences individuals’ information processing and comprehension. In an eye‐tracking experiment with participants from the general population (N = 188), we examined whether specific types of pictograph icons influence the processing strategy viewers use to extract numerical information. In addition, we examined the effect of iconicity and numeracy on probability estimation, recall, and icon liking. This experiment used a 2 (iconicity: blocks vs. restroom icons) × 2 (scenario: medical vs. nonmedical) between‐subject design. Numeracy had a significant effect on information processing strategy, but we found no effect of iconicity or scenario. Results indicated that both icon types enabled high and low numerates to use their default way of processing and extracting the gist of the message from the pictorial risk communication format: high numerates counted icons, whereas low numerates used large‐area processing. There was no effect of iconicity in the probability estimation. However, people who saw restroom icons had a higher probability of correctly recalling the exact risk level. Iconicity had no effect on icon liking. Although the effects are small, our findings suggest that person‐like restroom icons in pictographs seem to have some advantages for risk communication. Specifically, in nonpersonalized prevention brochures, person‐like restroom icons may maintain reader motivation for processing the risk information.     

一种引入积极管理的指数基金跟踪方法研究

提高指数基金跟踪精度是指数基金管理的主要任务.本文在指数基金资产配置过程中引入积极管理策略,建立了提高指数基金跟踪精度的斯坦规则指数跟踪模型.实证结果表明,应用斯坦规则结合不同信息进行指数跟踪,指数跟踪精度得到了提高.     

上证50ETF的运作状况分析

本文对上证50ETF的主要运作指标跟踪误差与折溢价水平进行计算分析,并通过结合国外ETF的运作状况进行比较,得出:我国ETF的发展由于起步较晚,且股权分置改革尚未完成,对上证50ETF的运作产生一定的影响,因而与国际上著名的ETF产品的运作存在一定差距。