改进的交叉算子在遗传算法中的研究及应用

交叉算子是遗传算子中一个重要的算予,是对双亲个体进行交叉重组得到不同的两个新个体的过程,对遗传算法搜索结果有重要的影响。从交叉概率和交叉策略两个方面可以改进交叉算子,将其应用到函数优化中能获得比典型的遗传算法更优的解,且性能更优。     

Solving problems through circles

Several problem-solving interventions that utilise a “circle” approach have been applied within the field of educational psychology, for example, Circle Time, Circle of Friends, Sharing Circles, Circle of Adults and Solution Circles. This research explored two interventions, Solution Circles and Circle of Adults, and used thematic analysis of questionnaire data to investigate the views of school staff that had taken part in these interventions. 62 participants were involved in a Solution Circle and 31 participants were involved in a Circle of Adults. Findings highlighted key features of these circle interventions which corresponded to those identified from relevant literature. Participants who had taken part in a Solution Circle described the applicability of solutions to other aspects of their work and a greater amount of strategies and solutions generated as a result of the group process. Participants who had been involved in a Circle of Adults session described having a greater understanding of a problem situation and empathy towards the focus pupil and the role of the educational psychologists in facilitating the process. Recommendations were made for educational psychology practice and for further research in this area.     

一类拟线性椭圆方程的强解的存在性

文章研究了一类二阶拟线性椭圆方程的Dirichlet问题。首先利用弱连续算子的锐角原理得到了此类方程的弱解存在性,然后运用极值原理,Ho咬lder模估计及H1+α正则性估计对解的正则性进行了提升,最后通过Lp理论得到了强解的存在性和唯一性。     

基于云理论与前景理论的创业机会优选

为解决创业机会评价与优选问题,提出基于云理论和前景理论的创业机会优选方法。首先,利用云理论建立自然语言云模型,把自然语言的定性描述合理地向定量描述转换;随后,结合TOPSIS方法,把正(负)理想方案作为机会选择的参照点,基于前景理论求解各创业机会的综合前景值,从中选取最优创业机会;最后,通过实例验证该方法的科学性和可行性,并比较其与传统方法的优越性。     

Quantitative and qualitative change in children's mental rotation performance

This study investigated quantitative and qualitative changes in mental rotation performance and solution strategies with a focus on sex differences. German children (N = 519) completed the Mental Rotations Test (MRT) in the 5th and 6th grades (interval: one year; age range at time 1: 10–11 years). Boys on average outperformed girls on both occasions (d_T1 = 0.45; d_T2 = 0.35). Strong quantitative change was reflected in increased test scores from time 1 to time 2. The increase was equivalent for girls (d = 1.04) and boys (d = 1.05). Qualitative change was investigated in a multigroup latent transition analysis (LTA) of the MRT items. LTA confirmed findings from prior studies showing that children used different solution strategies to solve the MRT problems. Girls tended to use less efficient strategies than did boys. Moreover, LTA revealed that participants showing inefficient solution strategies at time 1 tended to improve their performance less than students who already showed more elaborate strategies at time 1.     

奇异双曲方程整体弱解的一致渐近行为

考察奇异双曲型方程的初边值问题,获得了该问题的三阶一致渐近解。这一结果改进了P．H．Chang＆H．A．Levine[1]中的相应结果。     

遗传算法概述

遗传算法是一种全局优化的随机搜索算法。它是解决复杂优化问题的有力工具。在工程设计、演化硬件电路设计以及人工智能等方面应用前景广阔。系统地介绍了遗传算法的发展史、基本思想、特点、主要应用领域等相关方面。     

浅谈既有电气化铁路接触网改造过渡技术方案

本方案详细地介绍了既有电气化铁路接触网改造过菠中常用技术方案及施工安全措施,对既有电气化铁路进行增建二线和提速扩能接触网改造有一定的指导意义.     

对企业如何进行体育赞助的探讨

体育赞助作为公关赞助的一种形式,有着它的特殊性,本文在阅览大量有关资料的基础上,对国内外体育赞助的由来、发展和前景作了较为详细的介绍,列举了大量翔实的数据,体育赞助对体育的发展、企业品牌的创立、社会的进步等诸多方面进行了详尽的阐述,同时也指出了当前我们国内一些企业在体育赞助方面存在的误区和存在的问题,并对这方面存在的问题提出了较好的解决方法和途径。     

高校校园网网络安全整体解决方案研究

针对校园网安全管理问题,对高校校园网面临的各种安全威胁,逐一进行分析,探索一套科学合理的网络安全解决方案。