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1.
ABSTRACT

The focus of much mathematics teaching has been on the acquisition of counting, an area where children with Down syndrome can experience particular difficulties. Research with typically developing children has highlighted how early awareness of quantity provides a strong platform for the acquisition of later mathematical skills and programmes of early intervention have been introduced. Many of these studies are embedded in the work and traditions of developmental and cognitive psychology and can be difficult to access. Consequently, this is an area that has been largely ignored in the curricula of children with Down syndrome. This paper seeks to make this literature more available. It systematically reviews previous research with children with Down Syndrome on these early foundations. It considers seemingly contradictory findings in the light of differences in tasks, their presentation and instructions, and the responses required, in order to draw conclusions and reflect on the implications for teaching and learning. Some of these propositions are in contrast to existing practices and call for further research to test their effectiveness.  相似文献   
2.
针对折线形坡面,通过经典库仑土压力理论,对挡土墙的土压力作出近似的计算。  相似文献   
3.
三线扭摆法测刚体转动惯量所用近似方法的分析   总被引:1,自引:0,他引:1  
分析在推导转动惯量的测量公式时采用的近似方法和其对测量结果带来的影响,指出减小其影响的途径。  相似文献   
4.
在多指标综合评价中,层次分析法是确定指标权重的常用方法,但层次分析法的明显缺陷是具有主观性。为消除主观性,在层次分析法中引入逼近理想解的思想,从而构建一种确定指标权重的新方法--TOPSIS-AHP方法,并将其应用于线性加权综合评价模型中。实例表明,TOPSIS-AHP方法解决了城市综合实力评价中指标权重的确定,且评价结果更加符合实际。  相似文献   
5.
提出了随机信息系统的β-近似约简和目标随机信息系统的β-近似约简的概念,分析了它的一些特性及其与已有约简概念的关系,证明了β-近似约简是信息系统和目标信息系统的属性约简概念的推广,并通过实例说明了约简方法.  相似文献   
6.
The PP intervals of pulse main peaks from healthy and unhealthy people(arrhythmia) have different nonlinear char-acteristics. In this paper,the extraction of PP intervals of pulse main peaks is achieved by picking up P peaks of pulse wave with wavelet transform. Furthermore,several nonlinear parameters(correlative dimensions,maximum Lyapunov exponents,com-plexity and approximate entropy) of the PP intervals of pulse main peaks extracted from normal and unhealthy pulse signals are calculated,with the results showing that these nonlinear parameters calculated from the main wave interval signals are helpful for analyzing human's health state and diagnosing heart diseases.  相似文献   
7.
对陀螺逆转点法定向的数据处理进行了综述和比较。  相似文献   
8.
针对目前社交网络的研究多是基于内部成员之间的直接关系的研究。突破用图来定义社交网络的方式,提出了社交近似空间的概念,并通过发掘社交子空间的不精确路径定义了隐含路径,从而探索了一种针对社交网络的新的研究方法。  相似文献   
9.
Modern web search engines are expected to return the top-k results efficiently. Although many dynamic index pruning strategies have been proposed for efficient top-k computation, most of them are prone to ignoring some especially important factors in ranking functions, such as term-proximity (the distance relationship between query terms in a document). In our recent work [Zhu, M., Shi, S., Li, M., & Wen, J. (2007). Effective top-k computation in retrieving structured documents with term-proximity support. In Proceedings of 16th CIKM conference (pp. 771–780)], we demonstrated that, when term-proximity is incorporated into ranking functions, most existing index structures and top-k strategies become quite inefficient. To solve this problem, we built the inverted index based on web page structure and proposed the query processing strategies accordingly. The experimental results indicate that the proposed index structures and query processing strategies significantly improve the top-k efficiency. In this paper, we study the possibility of adopting additional techniques to further improve top-k computation efficiency. We propose a Proximity-Probe Heuristic to make our top-k algorithms more efficient. We also test the efficiency of our approaches on various settings (linear or non-linear ranking functions, exact or approximate top-k processing, etc.).  相似文献   
10.
Yunji Park 《教育心理学》2017,37(7):873-887
The present study examined the developmental change in number and length acuities and their respective relationship with achievement in various domains of mathematics in second vs. fourth graders. Length acuity was measured with a comparison task, in which participants were asked to choose the longer between a pair of lines. Number acuity was measured with a comparison task, in which the participants were asked to choose the more numerous between a pair of dot arrays. Within each grade, length acuity was more precise compared to number acuity. Number acuity was higher in fourth compared to second grade, but length acuity did not differ between grades manifesting a ceiling effect. In second grade, only length acuity was correlated with overall math achievement, especially Geometry and Arithmetic. In fourth grade, only number acuity was correlated with overall mathematical achievement, especially Number Concept and Applied Problems. Taken together, the present study demonstrates that the relationship between magnitude acuities and math achievement dynamically change over the course of elementary school years and that the strength of this relationship may depend on the type of magnitude and the domain of mathematics.  相似文献   
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