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珠像图训练对改善重度智障儿童的个案研究
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作者 沈国平 《珠算与珠心算》 2019年第3期36-39,共4页
由于大多数重度智障儿童的注意范围都很狭窄,这就极大地降低了他们学习的效率。本文采用单基线A-B实验设计,借助珠心算教学中的珠像图为训练载体,对某重度智障儿童进行了干预训练,并通过舒尔特方格测试获取实验数据,使用SPSS进行数据分... 由于大多数重度智障儿童的注意范围都很狭窄,这就极大地降低了他们学习的效率。本文采用单基线A-B实验设计,借助珠心算教学中的珠像图为训练载体,对某重度智障儿童进行了干预训练,并通过舒尔特方格测试获取实验数据,使用SPSS进行数据分析,从而得出珠像图训练对改善重度智障儿童注意广度具有显著效果。 展开更多
关键词 重度智障 珠像图 注意广度 注意力
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小学低年级“珠心算”教学中的瓶颈问题和对策研究
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作者 钱浩然 《数学教学通讯》 2017年第28期36-37,共2页
随着学习的深入,学生珠心算能力的差异开始显现,珠心算要想长足发展,就必须研究学生脑中拨珠表象的发生机制及其问题症结,以及如何打破训练"瓶颈"。本文简析了拨珠、口诀、图像瓶颈,并提出了微视频、口诀书、珠像图的解决思路。
关键词 心算 瓶颈 珠像图
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Estimation of total suspended matter in the Zhujiang (Pearl) River estuary from Hyperion imagery 被引量:3
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作者 LIU Dazhao FU Dongyang +1 位作者 XU Bing SHEN Chunyan 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2012年第1期16-21,共6页
Although remote sensing data have been used to estimate total suspended matter (TSM) in coastal waters, it has limitations when applied to estuary waters in low spatial resolution situations. The spatial resolution ... Although remote sensing data have been used to estimate total suspended matter (TSM) in coastal waters, it has limitations when applied to estuary waters in low spatial resolution situations. The spatial resolution of ocean color satellites such as SeaWiFS and MODIS is usually -1 km, and therefore is not adequate for small, local-scale areas such as the Zhujiang (Pearl) River estuary. In contrast, 30 m-resolution EO-1 Hyperion imagery has potential for studying TSM in localized areas. We measured the surface spectral radiance reflectance of the river estuary water in the visible and near infra-red spectral range. Sensitivity analysis indicated that the ratio of remote sensing reflectance at 813 nm (Rrs(813)) to reflectance at 559 nm (Rrs(559)) could be used to estimate TSM concentration, and a linear relationship was established between the ratio and in-situ TSM concentration. We applied the linear relationship to Hyperion imagery to map TSM concentration in the estuary. The Hyperion imagery provided sufficient spatial resolution to detect spatiotemporal changes in TSM concentrations in the estuary small estuary area. This study demonstrated the usefulness of Hyperion imagery for mapping the distribution of TSM in estuary waters. Keyword: Hyperion; total suspended matter (TSM); Zhujiang (Pearl) River estuary 展开更多
关键词 HYPERION total suspended matter (TSM) Zhujiang (Pearl) River estuary
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Land cover classification of remote sensing imagery based on interval-valued data fuzzy c-means algorithm 被引量:4
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作者 YU XianChuan HE Hui +1 位作者 HU Dan ZHOU Wei 《Science China Earth Sciences》 SCIE EI CAS 2014年第6期1306-1313,共8页
There is a certain degree of ambiguity associated with remote sensing as a means of performing earth observations.Using interval-valued data to describe clustering prototype features may be more suitable for handling ... There is a certain degree of ambiguity associated with remote sensing as a means of performing earth observations.Using interval-valued data to describe clustering prototype features may be more suitable for handling the fuzzy nature of remote sensing data,which is caused by the uncertainty and heterogeneity in the surface spectral reflectance of ground objects.After constructing a multi-spectral interval-valued model of source data and defining a distance measure to achieve the maximum dissimilarity between intervals,an interval-valued fuzzy c-means(FCM)clustering algorithm that considers both the functional characteristics of fuzzy clustering algorithms and the interregional features of ground object spectral reflectance was applied in this study.Such a process can significantly improve the clustering effect;specifically,the process can reduce the synonym spectrum phenomenon and the misclassification caused by the overlap of spectral features between classes of clustering results.Clustering analysis experiments aimed at land cover classification using remote sensing imagery from the SPOT-5 satellite sensor for the Pearl River Delta region,China,and the TM sensor for Yushu,Qinghai,China,were conducted,as well as experiments involving the conventional FCM algorithm,the results of which were used for comparative analysis.Next,a supervised classification method was used to validate the clustering results.The final results indicate that the proposed interval-valued FCM clustering is more effective than the conventional FCM clustering method for land cover classification using multi-spectral remote sensing imagery. 展开更多
关键词 fuzzy c-means cluster interval-valued data remote sensing imagery land cover classification
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