排序方式： 共有16条查询结果，搜索用时 15 毫秒
1.
Ying Xu Joseph Aubele Valery Vigil Andres S. Bustamante Young-Suk Kim Mark Warschauer 《Child development》2022,93(2):e149-e167
Dialogic reading, when children are read a storybook and engaged in relevant conversation, is a powerful strategy for fostering language development. With the development of artificial intelligence, conversational agents can engage children in elements of dialogic reading. This study examined whether a conversational agent can improve children's story comprehension and engagement, as compared to an adult reading partner. Using a 2 (dialogic reading or non-dialogic reading) × 2 (agent or human) factorial design, a total of 117 three- to six-year-olds (50% Female, 37% White, 31% Asian, 21% multi-ethnic) were randomly assigned into one of the four conditions. Results revealed that a conversational agent can replicate the benefits of dialogic reading with a human partner by enhancing children's narrative-relevant vocalizations, reducing irrelevant vocalizations, and improving story comprehension. 相似文献
2.
Emmanuel Bernuau Denis Efimov Wilfrid Perruquetti Andrey Polyakov 《Journal of The Franklin Institute》2014
The paper is reviewing the tools to handle high-order sliding mode design and robustness. The main ingredient is homogeneity which can be checked using an algebraic test and which helps us in obtaining one of the most desired properties in sliding mode control that is finite-time stability. This paper stresses some recently obtained results about homogeneity for differential inclusions and robustness with respect to perturbations in the context of input-to-state stability. Lastly within this framework, most of the popular high-order sliding mode control schemas are analysed. 相似文献
3.
Valery Y. Glizer Vladimir Turetsky Leonid Fridman Josef Shinar 《Journal of The Franklin Institute》2012,349(2):638-657
In order to construct the guidance strategy in a realistic nonlinear noise-corrupted interception endgame against a maneuverable target, a linearized zero-sum differential game is considered. Assuming perfect information in this game, sufficient conditions are established, which guarantee that a continuous interception strategy with memory (history-dependent) has the maximal capture zone. Two examples of such a strategy are analyzed: a modified super-twisting second-order sliding mode control and a modified integral sliding mode control. Simulation results of the original nonlinear interception endgame demonstrate that these strategies considerably reduce the chattering created by the classical game optimal bang-bang strategy without deteriorating the homing performance. 相似文献
4.
A. Polyakov 《Journal of The Franklin Institute》2012,349(4):1380-1396
Stabilization problem for a linear plant with time delay control is considered. A new method of the sliding mode control design minimizing the effects of system disturbances is presented. It is based on a combination of the well-known predictor-based sliding mode control algorithm with the recently developed invariant ellipsoid method. The theoretical results are supported by numerical simulations. 相似文献
5.
The article considers main education trends while society is moving towards totally new information environment—cyberspace. Aims and tasks of education are justified and specified. As a solution a new pedagogical technology (projective pedagogy) is suggested. It is based on system methodology of design and the so called productive knowledge, which generates new knowledge, indicating the most probable ways of quality improvement of the objects under study. 相似文献
6.
This article introduces readers to some of the cultural characteristics of education and educational development in Russia. Action Research is as yet a new influence on Russian educational thinking, and so this article makes a beginning by tracing the connection between the ‘Action Research’ approach and Russian ‘Activity Theory’ in the teacher training process. The assumption of the Russian participants in an international project devoted to action research in teacher training was that the facilitation of the ‘Activity Theory’ approach would make a relevant contribution to an understanding of action research. The practical implications of this link in various different contexts are described in the article. 相似文献
7.
Van Cauwenberghe Eveline Labarque Valery Gubbels Jessica De Bourdeaudhuij Ilse Cardon Greet 《Early childhood research quarterly》2012
Preschools offer two main opportunities, recess and physical education (PE), for preschool children to participate in physical activity (PA) and are considered a suitable institution for PA promotion given the large number of children enrolled. Although PE can have a meaningful effect on preschoolers’ PA levels, preschool PE characteristics associated with increased PA have, to the best of our knowledge, not been identified. Therefore, the purpose of the present study was to examine preschooler's PA levels and the associations with lesson context, teacher behavior, and environment during preschool physical education. A random sample of 573 preschoolers (288 boys; Mage = 5.4 years, SD = 0.4) from 35 preschools was examined during one PE class. Findings indicated that preschoolers accumulated 12 min (33%) of moderate-to-vigorous PA (MVPA), 5 min (13%) of light PA, and 20 min (54%) of sedentary behavior during PE. Forty-seven percent of the variance in pupils’ MVPA may be attributed to differences between PE classes. Less knowledge content, less promotion, less management, less preschoolers per 100 m2, using obstruction material, and not using throwing equipment were significantly associated with higher MVPA levels. These predictors explained 56% of the variance in MVPA at the PE class-level. To conclude, PE in its current format contributes only a small amount to the PA requirements of preschoolers. Preschoolers’ MVPA levels were related to modifiable PE characteristics indicating that preschool PE can be restructured to increase MVPA. 相似文献
8.
The paper surveys mathematical tools required for stability and convergence analysis of modern sliding mode control systems. Elements of Filippov theory of differential equations with discontinuous right-hand sides and its recent extensions are discussed. Stability notions (from Lyapunov stability (1982) to fixed-time stability (2012)) are observed. Concepts of generalized derivatives and non-smooth Lyapunov functions are considered. The generalized Lyapunov theorems for stability analysis and convergence time estimation are presented and supported by examples from sliding mode control theory. 相似文献
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10.
Valery Chirkov 《Int J Intercult Relat》2009,33(2):94-105
Author presents critical analyses of the philosophy and methodology of the current research in the psychology of acculturation. He defends three theses. First, that the dominant mode of research in the psychology of acculturation does not correspond to the essential qualities of the phenomenon under scrutiny—the acculturation process. Acculturation researchers have been trying to apply a positivistic and quantitative approach to a phenomenon that is far beyond the capacity this approach has to comprehend it. Second, that there is no culture in acculturation research and the researchers do not even have working models of culture that could guide research in this area. Third, that the complex nature of the acculturation process requires very diverse thinking about the subject, an application of various epistemological and methodological approaches, inter- and multi-disciplinarity, intellectual flexibility, and the willingness to critically analyse achieved results and obtained knowledge. Unfortunately, all these capacities and attributes are yet scarce in the discourse of the psychology of acculturation. The presentation of the arguments is structured in three sections. First, the author presents a philosophical framework suitable for analysing both the current and future models of acculturation research. Then, he reports the results of the analysis of 42 articles on acculturation which is followed by conclusions and implications derived from this analysis. In the third section, the author provides an example and formulates suggestions for future acculturation research. 相似文献