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Cristina Lpez-Pujalte Vicente P. Guerrero Bote Flix de Moya Anegn 《Information processing & management》2002,38(6):971
There have been recent applications of genetic algorithms to information retrieval, mostly with respect to relevance feedback. Nevertheless, they are yet to be evaluated in a way that allows them to be compared with each other and with other relevance feedback techniques. We here implement the different genetic algorithms that have been applied in the literature together with some of our own variations, and evaluate them using the residual collection method described by Salton in 1990 for the evaluation of relevance feedback techniques. We compare the results with those of the Ide dec-hi method, which is one of the traditional methods that yields the best results. 相似文献
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This paper examines the intertemporal returns of patented inventions using estimates of patent value obtained from German employee inventors’ compensation records. The paper finds heterogeneity in the mean age and dispersion of the annual returns by technology and cumulative patent value. While the returns earned by most patents dissipate rapidly, high valued patents tend to receive significant returns through the latter part of the patent term. These high valued patents which account for the vast majority of the realized returns, further can be identified based on past returns, relatively early in the patent term. These findings suggest that while shortening the length of the patent term could substantially reduce realized returns, graduated maintenance fees may not adversely affect returns, as firms would be able to identify and selectively renew the subset of high valued patents. 相似文献
85.
On most community college campuses where quality and improvement are taken seriously, there are at least three coexisting languages. The language of total quality management is spoken by administrators and by faculty members who teach management or business courses; the language of assessment is spoken by both faculty members and administrators; and the language of teaching and learning is spoken primarily by faculty members and academic administrators. Each language reflects a philosophical commitment to improvement. Each overlaps in terminology with the other two. Each suffices well in its own domain. Yet each is, by itself, insufficient as a campuswide lingua franca of continuous improvement. These languages may continue to coexist. If a college is really to accomplish a paradigm shift throughout the institution, however, it must generate its own language—a language spoken by all, a language that describes and discusses a campuswide system of quality, improvement, and change. 相似文献
86.
Jesse Lee Rhoades Tanis Joy Hastmann 《Measurement in physical education and exercise science》2014,18(1):53-71
The complexity of learning has plagued the educational establishment for decades. Recently, ideas of complexity theory and complex adaptive systems have made headway in how we think of institutions of learning. This study developed and tested an instrument for the modeling of underlying social structures, as an element of complexity, within the physical education learning environment. Currently, there are no instruments capable of producing valid and reliable models of underlying student social networks in physical education classes. This study sought to develop and test one of the first instruments for the explicit purpose of this modeling. The Network Examination for Student Socialization was developed as a product of this effort. Testing demonstrated the Network Examination for Student Socialization is both a reliable and valid instrument for modeling underlying student social structures within physical education classes. It is hoped that in years to come, the Network Examination for Student Socialization can play a key role in the study of complexity within physical education. 相似文献
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Ross M. Higashi Christian D. Schunn Jesse B. Flot 《Educational technology research and development : ETR & D》2017,65(6):1471-1493
Free online courses, including Massively Open Online Courses, have great potential to increase the inclusiveness of education, but suffer from very high course dropout rates. A study of 172 K-12 students and 114 K-12 teachers taking the same free, online, summertime programming course finds that student and teacher populations have different underlying motivational models that predict rates of persistence in the course despite having generally similar motivational levels. Student persistence is predicted by prior programming knowledge, intrinsic interest in the subject matter, and mastery approach goals. By contrast, teacher persistence is similarly predicted by intrinsic interest, but then also by self-identity as a programmer, performance approach goals, and negatively by performance avoidance goals. This sub-population discrepancy in predictive factors is novel, and may be reflective of differing environmental conditions or internal mechanisms between students and teachers. Future design of free choice learning environments can take these factors into account to increase rates of user persistence for different target user populations. 相似文献
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Cultural Studies of Science Education - This article attempts to add to the conversation on equity and science education by arguing that activist work necessitates turning away from conservative... 相似文献
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The purpose of this paper is to consider the continued saliency of the ideas of Harold O. Rugg, particularly for social studies
education. Given the conservative political times in which we work, and the current educational emphases on academic standards,
high-stakes standardized testing, and mastery of specified knowledge, and the impact of these developments on social studies
education, it is useful to revisit Rugg’s contributions to the field. In this paper, we examine Rugg’s social and curricular
theories. Then, in light of this examination, we imagine what Rugg would say about contemporary issues for social studies
education, and what we, as curriculum scholars and social studies educators, can learn from his likely responses. 相似文献