The effect of toxicity on COVID-19 news network formation in political subcommunities on Reddit: An affiliation network approach     

《International Journal of Information Management》2021

Political polarization remains perhaps the “greatest barrier” to effective COVID-19 pandemic mitigation measures in the United States. Social media has been implicated in fueling this polarization. In this paper, we uncover the network of COVID-19 related news sources shared to 30 politically biased and 2 neutral subcommunities on Reddit. We find, using exponential random graph modeling, that news sources associated with highly toxic – “rude, disrespectful” – content are more likely to be shared across political subreddits. We also find homophily according to toxicity levels in the network of online news sources. Our findings suggest that news sources associated with high toxicity are rewarded with prominent positions in the resultant network. The toxicity in COVID-19 discussions may fuel political polarization by denigrating ideological opponents and politicizing responses to the COVID-19 pandemic, all to the detriment of mitigation measures. Public health practitioners should monitor toxicity in public online discussions to familiarize themselves with emerging political arguments that threaten adherence to public health crises management. We also recommend, based on our findings, that social media platforms algorithmically promote neutral and scientific news sources to reduce toxic discussion in subcommunities and encourage compliance with public health recommendations in the fight against COVID-19.  相似文献   

基于反向随机投影的神经网络改进算法          下载免费PDF全文

许邓艳卢民荣 《福建工程学院学报》2020,(4):358-364

提出基于反向随机局部投影的神经网络效率改进算法，通过降低深度学习中的网络规模，重点解决了从“局部连接”到“全连接”和随机节点抽取时输入端节点信息丢失的问题，从而提升网络的效率。在算法中设置缩减参数，提升了算法的可伸展性，以适用于不同数据集的学习。通过数据集ISO-LET进行实验，结果表明，基于反向随机局部投影的神经网络效率改进算法的准确率、效率分别平均提升了3.48%和105.21%?在迭代20次的实验中进行了缩减参数调节实验，当参数设置为1.4时其准确率则优于传统全连接网络2.61%，效率提升了272.78%，具有明显的优势。  相似文献   

银西城市防护林景观设计与生态旅游规划研究     

张玉 《南平师专学报》2006,25(4):107-109,99

通过对银西城市生态防护林地理位置、生态旅游所具备优势和条件的调查,在可持续发展的基础上提出了局部范围内开展生态旅游的可行性,并对银西防护林景观生态旅游进行了初步规划。  相似文献   

Sample, Random and Variation: The Vocabulary of Statistical Literacy     

Jane M. Watson  Ben A. Kelly 《International Journal of Science and Mathematics Education》2008,6(4):741-767

This paper considers the development of school students’ ability to define three terms that are fundamental to statistical literacy: sample, random, and variation. A total of 738 students in grades 3, 5, 7, and 9 were asked in a survey to define and give an example for the word “sample.” Of these, 379 students in grades 7 and 9 were also asked about the words “random” and “variation.” Responses were used to describe developmental levels overall and to document differences across grades on the understanding of these terms. Changes in performance were also monitored after lessons on chance and data, emphasizing variation for 335 students. After 2 years, 132 of these students and a further 209 students who were surveyed originally but did not take part in specialized lessons, were surveyed again. The difference after 2 years between the performance of students who experienced the specialized lessons and those who did not was considered, revealing no differences in performance longitudinally. For students in grades 7 and 9, the association of performance on the three terms was explored. Implications for mathematics and literacy educators are discussed.  相似文献   

带右删失数据的非线性随机效应模型参数估计     

费绍金  宗序平  卞金萍 《洛阳师范学院学报》2008,27(5)

本文讨论了带右删失数据的非线性随机效应模型的参数估计,给出Gauss-Newton迭代法和改进后的Gauss-Newton迭代法,根据参数估计和算法给出数值模拟,验证了参数估计和算法的可行性.  相似文献   

随机截尾寿命试验两参数Pareto分布的Bayes统计分析     

康会光  刘杏梨 《安阳师范学院学报》2008,(2):16-19

利用随机截尾寿命试验数据,给出了两参数Pareto分布参数．可靠度和换效率的Bayes点估计及其置信限．  相似文献   

不平衡古漆器漆膜数据分类研究     

张岚斌  徐国庆  李澜 《教育技术导刊》2021,20(1):84-88

针对古漆器漆膜数据类间不平衡、样本规模小,以及传统机器学习算法分类效果较差的问题,提出一种改进SMOTE的过采样方法改变漆器漆膜数据样本分布,使其达到平衡。该方法通过比较各类样本间的欧式距离,删除了人工样本中的噪声数据,然后运用集成学习中的随机森林算法进行分类,提高了少数类的分类准确率。UCI数据集上的实验结果表明,改进的过采样方法性能更优,评价指标F1-score与AUC值分别得到2%、5%以上的提升。结合改进的过采样方法与机器学习算法进行对比实验,结果证明,随机森林算法精度更高,在对古漆器年代的判别中,随机森林算法的F1-score与AUC值高达87.76%、89.34%。  相似文献   

广告语体“随机造词”现象及其动因探析——以广告语体中的写意型三音节颜色词为例   总被引：1，自引：0，他引：1  

刘慧 《江西师范大学学报(哲学社会科学版)》2008,41(4):65-69

本文以广告语体中的一类新型颜色词——写意型三音节颜色词为研究对象,对该类词中出现的“随机造词”现象进行分析,并从语言学动因和社会动因两大方面探讨“随机造词”现象产生的原因。  相似文献   

关于M值随机序列的强极限     

李立众 《巢湖学院学报》2007,9(3):24-25

利用对数似数比作为任意离散型随机变量相对独立变量偏差的一种随机性度量,采用研究强极根定理的一种新方法一网的微分法(参见[4],[5],给到一一个关于离散型随机变量序列的强极限定理。  相似文献   

概率算法在求解定积分中的应用     

黄新  夏方礼 《怀化师专学报》2008,(5):31-33

结合概率原理和程序设计语言知识,设计了两种计算定积分的概率算法,然后比较了两种算法的优劣,数据实际结果表明,算法对复杂定积分的计算是很有效的．  相似文献