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132.
133.
Aaron Montero Ramon Huerta Francisco B. Rodriguez 《Journal of The Franklin Institute》2018,355(5):2951-2977
Neural processing layers built on divergent connectivity patterns display two types of stimulus-dependent responses: neurons that react to a few stimuli, specialists, and other ones that respond to a wide range of inputs, generalists. Specialists are essential for the discrimination of stimuli and generalists extract common and generic properties from them. This neural heterogeneity could have emerged because of animal adaptation to the environment. Thus, we suggest that there is a relationship between the percentage of specialists and generalists and the stimulus complexity. In order to study this possible relationship, we use patterns with different complexities in a bio-inspired neural network and calculate their classification errors for different ratios of these types of neurons. This study shows that, when the complexity of the stimuli is low, the minimum classification error is achieved with almost any specialist-generalist ratio. Thus, in this case, the role of these neurons during pattern recognition is unspecific. When this complexity is intermediate, both are needed to minimize the classification error, usually in a similar proportion. For increasing stimulus complexity, the importance of generalists decreases, until their relevance is fully nullified when the complexity is high. Therefore, if we adjust the specialist-generalist ratio to the complexity of patterns, we can build more effective neural networks for pattern recognition. Finally, we propose an estimation of stimulus complexity based on the proportion of these types of neurons observed by neural recordings. This offers the possibility to evaluate the stimulus complexity to which animals are adapted. 相似文献
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This research embedded in the National Study of Writing Instruction examines higher- and lower-achieving adolescents’ stances toward content-area writing through a qualitative discourse analysis of interviews with 40 students in California, Kentucky, New York, and Texas secondary schools. The study asked: (1) How do students’ stances toward writing compare in general and across disciplines? (2) How do stances compare among middle and high school students and among students with different achievement histories? Results suggest that adolescents generally hold positive attitudes toward writing that allows for the expression of subjective stances, which they report is more commonly assigned in English language arts classrooms. Implications for the adoption of new US standards for disciplinary writing are discussed. 相似文献
136.
Jeffery H. Marshall Claudia R. Aguilar Mario Alas Renán Rápalo Castellanos Levi Castro Ramón Enamorado Esther Fonseca 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2014,60(1):51-77
Honduras has made steady progress in expanding post-primary school coverage in recent years, but many rural communities still do not provide a middle (lower secondary) school. As a result, Honduras has implemented a number of middle school alternative programmes designed to meet the needs of at-risk populations throughout the country. This article analyses dropout in three of the four main alternative lower secondary school programmes in Honduras over a three-year period for a cohort of roughly 5,500 students. The results show that these programmes are indeed reaching a vulnerable population in the country, but dropout rates are generally very high – upwards of 50 per cent in some cases – between Grades 7 and 9. Furthermore, even in the control school comparison samples made up of formal lower secondary schools, about 25 per cent of children leave school between Grades 7 and 9. The authors’ analysis includes propensity score matching (PSM) methods that make more focused comparisons between students in alternative programmes and control samples. These results show that dropout rates in alternative programmes are not much different than in control schools, and only significant in one programme comparison, when taking into account family background characteristics like socioeconomic status (SES). Multivariate analysis within alternative programme samples finds that attrition is lower in those learning centres which have adopted key features of formal schools, such as university-educated teachers. The results highlight the tremendous variation in the alternative middle school sector in terms of programme features, school quality and student outcomes, as well as the challenges of expanding this sector to meet the growing demand for lower secondary schooling in Honduras. 相似文献
137.
Roger Jeffery 《Compare》2014,44(2):208-229
The challenges of ensuring equity among partners of very different academic power and status, across continents, within complex research projects involving differing disciplines with their own norms, and balancing needs for capacity development of individuals and for institutions can be major sources of conflicts. While each of these concerns has been addressed separately, the implications of situations where they reinforce each other have not. Drawing on experience in four complex, multi-partner and multi-disciplinary social science research projects, I consider four main overlapping issues: (1) the structural inequalities inherent in North-South relationships as well as between junior and senior researchers and how these raise difficult problems for research managers; (2) the implications of different kinds of local institutions, and of seeing authorship as a major feature of capacity building, even if no funding is allocated to the task within research grants; (3) the effects of multi-disciplinarity: how intellectual property is understood in different disciplinary settings as well as embodied in national or institutional rules, and the implications of these differences in the context of the pressures imposed by institutional review procedures, in particular the Research Excellence Framework in the UK; (4) the challenges to research managers of ensuring that transaction costs do not swamp the possibility of achieving real intellectual additionalities, and how to address the risk that the costs of collaboration outweigh the likely benefits. 相似文献
138.
Martin Carnoy Amber K. Gove Susanna Loeb Jeffery H. Marshall Miguel Socias 《Economics of Education Review》2008
This study uses rich empirical data from Brazil to assess how a government program (PDE) that decentralizes school management decisions changes what goes on in schools and how these changes affect student outcomes. It appears that the PDE resulted in some improvements in management and learning materials, but little change in other areas including evaluation and community relations. However, we find no evidence that schools’ participation in the PDE improved student achievement. The results for grade passing are stronger. Students in PDE schools saw greater increases in grade passing rates than students in non-PDE schools during the period of our study. We also estimate a positive relationship between PDE spending and student gains for those schools in the program, especially for spending on teaching and learning materials and furniture. We find no benefit of electronics spending or spending on teacher training, two of the three largest areas of school investment. 相似文献