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41.
施洁斌 《现代图书情报技术》2004,20(7):27-29
提出了将支持向量机应用于文本自动分类的研究,与常用的K-最邻近法相比,无论是对训练数据集还是测试数据集均具有一定的优势,而且不同特征选择方法对支持向量机的影响要比K-最邻近法小。此外,从研究中的不同特征选择的评价函数来看,它们对分类有一定的影响,应用X2统计进行特征选择的分类正确率最高,其次是文本证据权,而期望交叉熵的效果最差,说明特征选择在文本自动分类中也是相当重要的。 相似文献
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本介绍了选择TRS全检索系统建设动态图书馆网站的背景;TRS系统的体系结构,各部分的功能;详细探讨了TRS系统在图书馆网站中的应用,结合建设实践,探讨了在应用中的一些实际问题的解决。 相似文献
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茅忠德 《连云港职业技术学院学报》2002,15(4):62-64
标志中图形可以分为图像系统和字系统进行研究,一是确定图像和字之间的建构模式,二是确定图形和字之间谁为主要概念和谁为次要概念,以及主次概念在视觉选择过程中对标志内涵的理解方式。 相似文献
46.
We have studied the efficiency of research in the EU by a percentile-based citation approach that analyzes the distribution of country papers among the world papers. Going up in the citation scale, the frequency of papers from efficient countries increases while the frequency from inefficient countries decreases. In the percentile-based approach, this trend, which is uniform at any citation level, is measured by the ep index that equals the Ptop 1%/Ptop 10% ratio. By using the ep index we demonstrate that EU research on fast-evolving technological topics is less efficient than the world average and that the EU is far from being able to compete with the most advanced countries. The ep index also shows that the USA is well ahead of the EU in both fast- and slow-evolving technologies, which suggests that the advantage of the USA over the EU in innovation is due to low research efficiency in the EU. In accord with some previous studies, our results show that the European Commission’s ongoing claims about the excellence of EU research are based on a wrong diagnosis. The EU must focus its research policy on the improvement of its inefficient research. Otherwise, the future of Europeans is at risk. 相似文献
47.
朱熹在建构《大学章句》的体系时,采取了一种志与功相统一的说理方法。这种方法既表现在《大学》经章里,也表现在《大学》传章里,而且在不同的说理层次上,存在着不同的志与功的统一,既有纲领之间的志与功相统一,也有条目之间的志与功相统一,这分别体现在经章与传章里,而且基本上呈现出一一对应的关系。 相似文献
48.
This study explored the co-developmental trajectories of autonomy, competence and relatedness need satisfactions at school and their relations to mental health and academic functioning in Chinese elementary school students. An accelerated longitudinal design was used with a sample of three cohorts (grade 3, grade 4, and grade 5) (N = 1070, 45.8% female; Mage = 9.44, SD = 0.97) on four occasions at 6-month intervals. Parallel process latent class growth models revealed five heterogeneous patterns (i.e., Congruent-moderate; Congruent-high; Congruent-low; Congruent-decreasing; Low-autonomy, High-competence and relatedness), all of which significantly associated with time-varying mental health and academic functioning indicators. The findings highlight the importance of subgroup differences and possible cultural considerations in understanding the progression of psychological need satisfactions and the need for universal screening and dynamic monitoring of students’ psychological need satisfactions at school and implementing more sophisticated interventions tailored to the unique characteristics of the relevant subgroups to promote optimal mental health and learning. 相似文献
49.
Two studies explored the role of the spontaneous use of spatial note-taking strategies (i.e., creating maps and drawings) and spatial ability in learning from a scientific passage. In Study 1, college students read and took notes by hand on a 10-paragraph scientific passage about the human respiratory system. Students tended to use verbal strategies such as lists (on 48% of the paragraphs), outlines (29%) and running text (15%), but also used spatial strategies such as maps (28%) and drawings (11%). Regression analyses indicated that spatial ability and the use of spatial strategies (maps or drawings) significantly predicted learning outcomes, with spatial strategy use explaining additional variance beyond spatial ability. In Study 2, students read the same scientific passage and took notes either by hand on paper (paper group), by hand on a large whiteboard (whiteboard group), or on a laptop computer (computer group). A similar general pattern as Study 1 was found for the paper group, but this pattern was not found for the computer or whiteboard groups, suggesting that the relationships found in Study 1 might depend on the note-taking medium. Results also indicated that students in the paper and whiteboard groups spontaneously used more spatial strategies, whereas the computer group tended to use verbal strategies (i.e., words only), suggesting that different note-taking contexts encourage different strategies. 相似文献
50.
李莉 《泉州师范学院学报》2011,29(1):73-76
晚年的金克木把笔触深入到文化的层面,通过对历史与现今文化的回顾、比较及分析,对我们民族文化的精神进行挖掘与展望。金克木喜欢对历史人物重新进行议论,而他的评价与我们所熟悉的历史定位往往不同,而且有的人物还是我们所不熟悉的,金克木对他们的评价总以一个统一的标准来衡量,那就是文化意义。因为金克木的写作目的很明确,为时下的中国文化乃至世界文化把脉。 相似文献