重抽样优化的快速随机抽样一致性算法

为了快速、准确地对含有高比例外点的数据进行模型参数估计,提出一种重抽样优化的快速RANSAC算法.首先在模型检验之前增设预检验,并采用一种基于样条曲线的损失函数来评价模型的质量;然后通过反复重抽样和模型检验来优化内点集;再依据双阈值对内点集进行渐近提纯;最后利用最优内点集来计算模型的参数.特征匹配和基础矩阵估计的实验结果表明,该算法具有较高的精度和效率;当外点比例高于50%时,运行速度比传统算法提高大于2个数量级.

试析现代考试的特征与功能

【正】 近些年来,我国高等教育界掀起了推广标准化考试的热潮.不少学科都相继建立了试题库.纵观考试的各个环节,从题型的选择,试卷的编制,到考试的组织及试卷的分析等都呈现出标准化、客观化与科学化的变革势头.这表明在我国高等教育界沿袭多年的传统考试正随着教育改革的深入逐步为现代考试所取代.然而。

Research on the Gender and Age Differences of Middle School Students＇ Shame Sense

In order to ensure the existence of the gender and age differences of middle school students＇ shame, 1258 Shanghai middle school students are surveyed with the help of the Middle school students＇ shame measurement scale with the combination of delaminating and random sampling. The results of questionnaire show that there are significant gender differences in middle school students＇ shame and the average scores of male students＇ shame are higher than those of female students. Besides, there does exist significant age differences in middle school students＇ shame, but it is not simple linear relationship between the feeling of shame and ages. The feeling of shame reaches maximum at the age of 14 and intervention should be given at this age, which young students feel sensitive most. It is suggested that collective remission of the shame should be offered to middle school students with the methods such as physical exercises, persuasion etc.