一类多点边值问题的算法研究

针对一类拉普拉斯方程多点边值问题的数学计算方法进行了研究,构造出了一类差分格式。对该差分方法进行了误差分析,并给出了数值实验结果。     

Relationships of the Monetary Policy, Stock Market and Real Investment in China Based on Markov-Switching Model

This paper studies the relationships of the monetary policy, stock market and real investment in China based on Markov-Switching-Vector Error Correction Model. It shows that there is a cointegration relationship among the three ones. We disclose the riddle that the stock market is in recession, but the growth rate of economy is very high in recent years. We also find that Chinese economy operated stably most of the time during the past 8 years. But if the economy is difficult to continue its high growth, it is more likely to appear ＂hard landing＂ than ＂soft landing＂. The impulse response analysis indicates the asymmetry between the ＂too cold＂ economy regime and the ＂too hot＂ regime. And the economy will oscillate during the subsequent time when it is shocked under the ＂too hot＂ regime.     

一种基于导频的OFDM系统信道估计方法

提出一种使用矩形导频图案的OFDM信道估计方法。接收端首先在频率方向估计信道,然后在时间方向插值。该方法仅需累加和少量乘法运算就能估计出信道冲激响应,复杂度低,实时性高。在未编码16QAM-OFDM系统中,通过仿真将提出的方法与线性、cubic和MMSE插值法进行均方误差和误比特率的比较。结果表明该方法性能优于前两者,接近后者。     

示范法和示错法在速滑教学中作用的分析

演示法是速滑教学中最基本、最重要的教学手段,是教师传授速滑知识、技能及帮助学生建立技术动作表象和形式概念的基本途径.通过演示法中"示范"和"示错"两种方法的剖析,着重论述了准确的示范及恰到好处的示错,能给学生展示出正确与错误的动作形象,起到加强学生动脑,发展思维,深化理解,激发兴趣,指导实践的效应,最终达到提高教学质量的目的.     

对我国优秀女足赛前高原训练疲劳判定及恢复措施状况的调查

疲劳是运动训练的必然结果,轻则影响运动水平的发挥,重则严重影响机体的健康水平。赛前在高原环境下训练的特殊时期,准确地判断高原训练的疲劳程度,及时采取恢复措施具有重大意义。以我国优秀女足为研究对象,对其赛前高原训练疲劳判定及恢复措施状况进行调查,以期为今后的训练实践提供参考。     

机器视觉尺寸检测系统中安装误差分析

利用齐次坐标变换建立了面阵CCD尺寸检测系统中从工件平面到CCD平面的坐标变换关系，得出了无误差测量的变换公式，并讨论了这种投影变换的特点及在不精确测定安装参数的情况下对各被测尺寸分别标定进行测量的方法。     

嫁接苗木自动化品质检测与分级研究

利用计算机图像处理技术，结合目前自动化嫁接技术的发展与特点，模拟人的分级选苗过程，设计出苗木自动化品质检测与分级软件。利用该软件进行瓠瓜、西瓜苗木品质检测试验，结果与人工检测相比0级苗与1级苗的准确率均达到了100％，实现了苗木嫁接前的自动选苗。有利于进一步提高苗木嫁接质量，推动我国工厂化培育嫁接苗的快速发展和促进自动化嫁接技术的完善与发展。     

指纹图像质量评价系统

指纹图像质量评价系统对于提高整个自动指纹识别系统的性能具有非常重要的意义 .在选取了指纹图像的总体灰度均值、块水平下的灰度均值和灰度方差、点方向信息、块方向信息作为评价因子后 ,首先求取各质量评价因子以及在其基础上的质量分 ,然后综合考虑各种评价因子求取总的质量分 ,最后给出最终的评价结果 .     

基于最大似然估计的多目标定位

宽带高分辨雷达多目标定位问题一般是先进行精确时延估计，再进行源定位。本文提出了一种在频域运用最大似然估计进行目标位置反演的方法，归结为全局搜索--目标函数的极值。通过对仿真数据的处理，结果显示该方法可以准确的估计出多目标位置。     

Robot Calibration Using Active Vision-based Measurement

This paper presents an efficient robot calibration method with non-contact vision metrology. Using the coplanar pattern to calibrate camera made the active-vision-based end-effector pose measurement be a feasible and cost-effective way. Kinematic parameter errors were linearized and identified through two-step procedure, thus the singular and non-linear condition was overcome. These errors were then compensated using inverse model method. The whole calibration process is flexible, easy to implement and prevents the error propagation from the earlier stages to the later ones. Calibration was performed on MOTOMAN SV3 industrial robot. Experiment results show that the proposed method is easy to setup and with satisfactory accuracy.