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创新课堂教学,让学生快乐学习——大学课堂教学改革尝试 被引量:10
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作者 易奇志 《广西师范学院学报(哲学社会科学版)》 2007年第S2期112-115,共4页
提高大学教学质量的关键是大学课堂要转变学生的学习方式、教师的教学方式。课堂上如何提高学生的学习积极性和参与性,培养学生的创新能力和合作能力,笔者作了一些课堂教学方式的创新尝试。
关键词 课堂教学创新 想学、愿学、乐学 当众讲述 问题探讨法
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Individual Identification of Electronic Equipment Based on Electromagnetic Fingerprint Characteristics
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作者 Han Xu Hongxin Zhang +3 位作者 Jun Xu Guangyuan Wang Yun Nie Hua Zhang 《China Communications》 SCIE CSCD 2021年第1期169-180,共12页
With the rapid development of communication and computer,the individual identification technology of communication equipment has been brought to many application scenarios.The identification of the same type of electr... With the rapid development of communication and computer,the individual identification technology of communication equipment has been brought to many application scenarios.The identification of the same type of electronic equipment is of considerable significance,whether it is the identification of friend or foe in military applications,identity determination,radio spectrum management in civil applications,equipment fault diagnosis,and so on.Because of the limited-expression ability of the traditional electromagnetic signal representation methods in the face of complex signals,a new method of individual identification of the same equipment of communication equipment based on deep learning is proposed.The contents of this paper include the following aspects:(1)Considering the shortcomings of deep learning in processing small sample data,this paper provides a universal and robust feature template for signal data.This paper constructs a relatively complete signal template library from multiple perspectives,such as time domain and transform domain features,combined with high-order statistical analysis.Based on the inspiration of the image texture feature,characteristics of amplitude histogram of signal and the signal amplitude co-occurrence matrix(SACM)are proposed in this paper.These signal features can be used as a signal fingerprint template for individual identification.(2)Considering the limitation of the recognition rate of a single classifier,using the integrated classifier has achieved better generalization ability.The final average accuracy of 5 NRF24LE1 modules is up to 98%and solved the problem of individual identification of the same equipment of communication equipment under the condition of the small sample,low signal-to-noise ratio. 展开更多
关键词 signal fingerprints histogram-based signal feature starting point detection signal level cooccurrence matrix ensemble learningn
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基于SVM技术的文本分类研究 被引量:2
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作者 祝磊 《软件导刊》 2006年第12期26-28,共3页
SVM(Support Vector Machine,支持向量机)是由Vapnik等人提出的一种新的机器学习方法。以结构误差理论、条件二次优化理论与核空间理论作为理论基础,能够较地的解决机器学习的问题,如模型选择、过学习、非线性问题和灾难维数等,很适合... SVM(Support Vector Machine,支持向量机)是由Vapnik等人提出的一种新的机器学习方法。以结构误差理论、条件二次优化理论与核空间理论作为理论基础,能够较地的解决机器学习的问题,如模型选择、过学习、非线性问题和灾难维数等,很适合应用在文本分类领域。针对文本分类技术的新问题,研究了已有的主动学习方法并对其进行改进,提出了一种新的主动学习算法,很好地解决了小规模标注样本集的分类问题。该方法尤其在难以获得大量类标签或者标注样本耗费较大的领域,更能显示出它的优越性,适合日新月异的互联网的应用。 展开更多
关键词 文本分类 SVM技术 支持向量 主动学习
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