高等数学开设数学实验的信息论分析

信息论是以数学的方法来研究广义的信息传输、提取和处理系统中一般规律的科学.本文从信源编码、信道编码和离散信源特点等方面,论述了在高等数学教学中开设适当的数学实验的必要性.     

遗传算法求解旅行商问题的一个新方法

提出了利用遗传算法求解TSP问题的一个新方法,该方法采用二进制编码,并巧妙地设计了一种解码算法,不仅可以使得种群进化,而且扩大了搜索的空间。实验表明,比起传统的遗传算法,新方法的性能有显著改善。     

算术平均值滤波器抗噪性能分析及应用

本文利用随机变量数字特征分析了算术平均值滤波器的信噪比,并指出应用中需注意的问题。     

Viterbi译码算法改进

改进后的Viterbi译码算法,不但保持了原有Viterbi算法的特性,而且在减少译码路径的情况下,较好地解决了突发错误信道中原Viterbi译码算法性能急剧下降的问题．通过在编码信道模型上的仿真表明：正确的约束位越多、分布的越密,则性能提高越明显．     

综合课程建设与伯恩斯坦的编码理论

根据伯恩斯坦的编码理论 ,综合课程与其他课程的区别是一种类型的不同 ,而不是层次上的差异 ;综合课程的建设不仅是内容的整合 ,也是教师和学生角色的重建过程。综合课程的建设与教师的教学模式和学生的学习取向等密切相关 ,与学校的组织结构和互动方式也有十分紧密的关系。综合课程的困难主要表现在学生的认同比较困难 ,对人的培养的预见性不强 ,评价困难。我们应从开放关系的角度理解综合课程的概念、综合课程的实施、综合课程的评价方法。     

人体运动图像边缘处理

根据人体运动图像的特点，引用图像层的平滑处理和图像层的边缘处理获得了较好的人体运动边缘图像，通过轮廓跟踪能较好地提取了人体运动图像边缘，为研究人体运动图像质心定位作好了准备。同时也为处理人体运动图像提供了一种新的方法。     

Promoting basic arithmetic competence in early school years–using a response to intervention model

This study investigated whether mathematics education based on a multi-tiered response to intervention (RTI) model can support students' arithmetic competence in primary schools in Sweden. The intent was to identify and support students at risk of failure. In this study, 113 students participated in the intervention, and 30 students participated in the control group. Both groups were followed from Grade 1 to the end of Grade 2 and compared. During the first semester in Grade 1, all students were taught basic addition and subtraction with explicit instructions in Tier 1. Those who did not respond to Tier 1 after one semester were provided support within Tier 2 during the second semester. The same was repeated in grade 2 and the students that did not respond to Tier 2 were supported within Tier 3. At the end of Grade 2, students in the intervention group performed significantly higher on the basic arithmetic competence in the number range 1–9 than the control group. No significant difference was found in a test measuring basic arithmetic competence in the number range 10–19. This study shows that using multi-tiered RTI might be sufficient to identify and support students at risk in early arithmetic competence.     

Bounding,An Accessible Method for Estimating Principal Causal Effects,Examined and Explained

Estimating treatment effects for subgroups defined by posttreatment behavior (i.e., estimating causal effects in a principal stratification framework) can be technically challenging and heavily reliant on strong assumptions. We investigate an alternative path: using bounds to identify ranges of possible effects that are consistent with the data. This simple approach relies on fewer assumptions and yet can result in policy-relevant findings. As we show, even moderately predictive covariates can be used to substantially tighten bounds in a straightforward manner. Via simulation, we demonstrate which types of covariates are maximally beneficial. We conclude with an analysis of a multisite experimental study of Early College High Schools. When examining the program's impact on students completing the ninth grade “on-track” for college, we find little impact for ECHS students who would otherwise attend a high-quality high school, but substantial effects for those who would not. This suggests a potential benefit in expanding these programs in areas primarily served by lower quality schools.     

图Km,n∪Kp,q的算术性

两个偶图Km,n与Kp,q的并记作Km,n∪Kp,q.利用构造的方法,给出了图Km,n∪Kp,q的一个算术标号,证明了图Km,n∪Kp,q是（k,d）算术图,从而推广了路线等人的相应结果.     

电力系统无功优化的改进遗传算法研究

针对传统遗传算法在无功功率优化中不能收敛的情况,选用了混合整数编码、锦标赛选择机制和临近变异等措施对遗传算法进行改进.这些改进符合电力系统运行的实际,具有较好的收敛精度和收敛速度.IEEE14节点系统的优化结果表明该方法优化性能较好,能较快地搜索到最优解.