排序方式: 共有43条查询结果,搜索用时 31 毫秒
41.
Laetitia Bueno-Ravel Ghislaine Gueudet 《International Journal of Computers for Mathematical Learning》2009,14(1):1-20
The study we present here concerns the consequences of integrating online resources into the teaching of mathematics. We focus
on the interaction between teachers and specific online resources they draw on: e-exercise bases. We propose a theoretical
approach to study the associated phenomena, combining instrumental and anthropological perspectives. For given didactical
tasks, we observe teachers’ instrumental geneses, and the didactical techniques they develop. We exemplify our approach with
the analysis of a case study of trigonometry in grade 9.
相似文献
Ghislaine GueudetEmail: |
42.
Ghislaine?Gayraud Christophe?PouetEmail author 《Probability Theory and Related Fields》2005,133(4):531-558
We consider the problem of testing hypotheses on the regression function from n observations on the regular grid on [0,1]. We wish to test the null hypothesis that the regression function belongs to a given functional class (parametric or even nonparametric) against a composite nonparametric alternative. The functions under the alternative are separated in the L2-norm from any function in the null hypothesis. We assume that the regression function belongs to a wide range of Hölder classes but as the smoothness parameter of the regression function is unknown, an adaptive approach is considered. It leads to an optimal and unavoidable loss of order Open image in new window in the minimax rate of testing compared with the non-adaptive setting. We propose a smoothness-free test that achieves the optimal rate, and finally we prove the lower bound showing that no test can be consistent if in the distance between the functions under the null hypothesis and those in the alternative, the loss is of order smaller than the optimal loss. 相似文献
43.