Algorithmic thinking development through physical computing activities with Arduino in STEM education

Education and Information Technologies - The need to benefit from information technologies in the twenty-first century digital age is increasing in all economies to overcome problems and...     

关于奇异矩阵的Cayley—Hamilton定理

给出了Cayley-Hamilton定理的另一证法。     

Change in beliefs after first-year of teaching: The case of Turkish national curriculum context

The impact of national curriculum context on mathematics related beliefs of 12 beginning middle grades mathematics teachers was investigated after the teacher education program and first-year teaching through interviews and a combination of three belief frameworks. National curriculum requirements, lack of effective mentoring programs, and preservice tutoring experiences were detected as the major factors impacting beliefs. Participants simultaneously had teacher-centered and student-centered beliefs, causing inconsistency in beliefs and practices. While participants’ preservice and first-year experiences contrasted, they developed contextual beliefs to deal with the difficulties. Reflections on teacher education and beginning teacher support policies in national curriculum contexts were discussed.     

验证性因素分析的理论与应用——以数学考试的验证性因素分析为例

验证性因素分析是依据一定的理论对潜在变量与观察变量间关系做出合理的假设并对这种假设进行统计检验的现代统计方法。本研究采用LISREL软件对某次数学考试的结构进行了检验,试卷设计方案基本得到了验证,显示了较好的结构效度。     

New insights in stability analysis of delayed Lotka–Volterra systems

Most of the reported Lotka–Volterra examples have at most one stability interval for the delay parameters. Furthermore, the existing methods fall short in treating more general case studies. Inspired by some recent results for analyzing the stability of time-delay systems, this paper focuses on a deeper characterization of the stability of Lotka–Volterra systems w.r.t. the delay parameters. More precisely, we will introduce the recently-proposed frequency-sweeping approach to study the complete stability problem for a broad class of linearized Lotka–Volterra systems. As a result, the whole stability delay-set can be analytically determined. Moreover, as a significant byproduct of the proposed approach, some Lotka–Volterra examples are found to have multiple stability delay-intervals. To the best of the authors’ knowledge, such a characterization represents a novelty for having some insights in the population dynamics: in some situations, a longer maturation period of species is helpful for the stability of a population system.     

An example of the use of dynamic mathematics software to create problem-solving environments that serve multiple purposes

Problem-solving is regarded as a major component of mathematical performance, and well-designed problem-solving-based learning environments have the potential to assist students in developing a meaningful understanding of mathematical concepts and procedures. In this respect, given its various features, dynamic mathematics software has been regarded by mathematics educators as a promising tool for designing such environments. This study presents an example of the use of technology to create a dynamic learning environment through a discussion of the pedagogical value of a problem selected for an activity, followed by the implementation sequence of the problem-solving activity in the classroom. The students’ experiences during the implementation of the activity are also discussed; and finally, an additional version of the problem is recommended for use in the classroom.     

基于专利和科技论文的技术机会识别研究——以金属3D打印技术为例

主要基于Web of Science科技论文和Derwent专利文献,利用SATI、SPSS等分析工具,提取文本关键词并构建相异共现矩阵,采用多维聚类方法识别研究热点主题。在继承和发展Naoki Shibata技术机会理论的基础上,通过对比科技论文和专利文献研究热点主题的差异来识别金属3D打印的技术机会。研究得出,科技论文和专利文献分别有4个研究热点主题,识别了两大类共4个技术机会。首次基于专利和科技论文研究金属3D打印的技术机会,开拓了金属3D打印的研究视野,对金属3D打印行业的企业战略决策具有指导作用。     

构建JMX的RFID中间件设计与研究

根据现有RFID设备存在的问题,以及RFID上层应用的多样性和数据的海量性,提出基于JMX的分布式RFID中间件架构。该中间件架构主要由硬件管理模块、事件数据处理模块、应用服务模块和管理控制模块四部分组成。具体介绍各功能模块的软件设计和实现。该分布式中间件实现了数据采集和应用的分离,拥有高度的伸缩性,能方便系统的集成和扩充。     

基于C/S架构的科研管理系统的研究与设计

在高校,科研管理水平的高低反映了一个学校的整体实力和对外形象。笔者根据调查研究,制定出合理、规范的系统目标,分析该系统所需要各种身份用户,对每种身份用户的权限进行介绍。采用C/S架构把高校科研管理系统分成三大子系统,将每个子系统细化为几个模块,然后对每个模块进行研究与设计。