重复标定的惯组误差模型系数计算方法

通过建立合适的惯组测量坐标系,构建了惯组内部惯性器件敏感轴和惯组测量坐标系之间固定的相对关系,实现了惯组在六面体测试工装内每次标定的误差模型系数均反映同一个映射关系,实现了惯组重复安装标定时惯组误差模型系数的统一计算、对比,对方便工程使用、有针对性地改善惯性器件性能有着重要的意义.     

基于改进Canny算子的手势图像边缘检测

针对手势检测不准确,手势边缘检测有偏差等问题,文中提出了一种改进的Canny算子用于检测手势图像边缘。改进的Canny算子使用自适应中值滤波与双边滤波相结合的方法去除图像噪声,并在Sobel的基础上扩展45°和135°方向的梯度幅值计算,自适应获取最佳阈值判别图像边缘。最后,使用哈夫变换与像素点的梯度方向相结合检测边缘,连接边缘、增强边缘。实验表明,改进后Canny算子检测的结果8连通数比传统Canny算子检测的结果8连通数多,边缘连续性较好,检测精度更高且自适应性增强。     

基于FPGA的图像中值滤波器的硬件实现

为了实现图像的实时处理,常采用现场可编程门列阵FPGA对采集的数字图像做预处理,在讨论中值滤波算法原理的基础上,利用VHDL硬件描述语言设计一个中值滤波模块对输入图像进行去噪处理,仿真结果说明该算法满足实时性要求,取得较好的仿真效果,并对中值滤波的改进算法进行了讨论。     

TLD目标跟踪算法综述

TLD目标跟踪算法将检测和跟踪同时加入跟踪框架,并引入半监督机器学习算法对锁定目标不断学习以捕获其最新外观,使目标无处可逃,从而实现对未知目标的长时跟踪.简要介绍了TLD算法的理论背景和系统框架,并指出其存在的主要缺陷.然后对各个缺陷所提出的改进方法进行详细地综述,并给出自己的评述.最后总结全文并展望TLD目标跟踪算法在未来几年的发展趋势.     

黄土坡面细沟发育过程中的重力侵蚀实验研究

利用室内模拟实验的方法对典型坡度条件下黄土坡面细沟发育过程中的重力侵蚀规律进行了研究。通过对水沙测量结果的统计分析，同时结合实验中对重力侵蚀现象的观测，给出了实验条件下的临界重力侵蚀含沙量，以此为依据计算了重力侵蚀产沙量及重力侵蚀量达到总侵蚀量50%时对应的“中值时间”。结果表明，在细沟发育过程中，重力侵蚀产沙量存在着由增大到减小再到波动的变化趋势，这一趋势对坡面产沙变化具有重要的影响。重力侵蚀发生的中值时间则由小变大，反映了细沟发育的不同阶段重力侵蚀由以沟头坍塌为主向以沟壁崩塌为主的转化过程。     

A Balanced Design for 18 Varieties

A solution is given to the problem of finding a balanced incomplete block design for 18 varieties in 51 blocks of six plots each. The design is obtained by combining group divisible partially balanced designs and duplicating some of the blocks.     

卫星云图修复方法研究与实现

针对卫星云图中不可避免的丢线现象,基于中值滤波的基本思想,提出一种结合霍夫变换的图像修复方法.该方法在定位丢线位置的基础上,仅采集垂直方向邻域像素点,并根据窗内异常点个数自适应调整窗口尺寸进行修复.从卫星云图处理实时性要求高、主观视觉效果和客观评价标准3个方面,对传统整体变分、自适应滑动平均、结合霍夫变换的自适应中值滤波3种修复方法进行比较.通过仿真结果表明,这种根据丢线分布特征改进后的中值滤波方法更适合修复卫星云图中的丟线.     

A design software to facilitate learning via repeated practice by Chemical Engineering students

A design software was developed within the paradigm of Technology Enhanced Learning (TEL) to facilitate learning via a repeated practice approach by Chemical Engineering students reading a core module called Fluid–Solid Systems. The software was developed to be able to generate detailed solution steps to typical engineering design problems encountered within this core module. Students were able to utilize the software to generate complete solutions to such problems for comparisons with their own hand calculations and thereby apply a repeated practice approach towards their learning of engineering design calculations. Highly favorable responses were received from students with regards to the utility of the software towards enhancing their abilities to apply the knowledge they had acquired in the module, engage in independent learning of the subject outside of formal classroom hours and understand concepts that were discussed during lectures and tutorials. Students who utilized the software more frequently throughout the semester performed better in the final examination. Interestingly, a minimum threshold in usage frequency of the software seemed to be necessary for the positive effect on performance in the final examination to be significant. As a TEL intervention to enhance students’ learning via a repeated practice approach, this pedagogical intervention was deemed highly scalable to large class sizes and effective in overcoming constraints relating to limited classroom hours.     

动态重复与线性展开——对大舍幼儿园设计中传统空间关系的解读

当代中国．如何在建筑与城市设计中．尤其是”空间”这一更为本质的层面．体现“本土意识”是一个值得探讨的话题。通过对大舍两个幼儿园设计实例（青浦夏雨幼儿园和嘉定新城实验幼儿园）的分析，研究其空间关系和组织模式对于中国传统空间的传承．进一步探索东方文化支配下的建筑与城市空间的特质。     

中值滤波器对信号相位和形状影响的研究

中值滤波器具有许多优点,已经在VSP等地震资料处理中得到较为广泛的应用。由于中值滤波器是一种非线性滤波器,对尖脉冲的响应是零,在傅氏域没有“真正”的振幅普和相位谱,所以了解其特性比了解线性滤波器特性要困难得多。然而许多简单的数值方法可合理、直观地了解这种滤波器在地震资料中的作用。其中,通过研究它对各种信号的响应来了解其性质是一种有效而实用的方法。在此方法基础上分析了中值滤波器的特性。