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浅谈全媒体时代下时政新闻的用户分类传播 被引量:1
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作者 华鸿敏 《传播力研究》 2019年第18期127-127,共1页
在当前信息化的时代,新闻媒体的发展与传统的新闻媒体相比,在用户群体方面发生了极大的变化,网络用户逐渐增多,使得人们走入真正的全媒体时代,让人们获取新闻的方式变得更加方便快捷,同时也使得新闻行业获得全新的发展。本文就是通过对... 在当前信息化的时代,新闻媒体的发展与传统的新闻媒体相比,在用户群体方面发生了极大的变化,网络用户逐渐增多,使得人们走入真正的全媒体时代,让人们获取新闻的方式变得更加方便快捷,同时也使得新闻行业获得全新的发展。本文就是通过对全媒体时代的介绍,分析当前时政新闻的用户分类传播。 展开更多
关键词 全媒体时代 时政新闻 用户分类传播
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基于类传播分布的关系近邻异质性网络分类方法 被引量:2
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作者 董飒 刘大有 +2 位作者 李丽娜 欧阳若川 柴晓丽 《吉林大学学报(工学版)》 EI CAS CSCD 北大核心 2016年第2期522-527,共6页
基于同质性假设的关系分类方法对异质性网络分类性能较差,针对异质性网络的分类问题提出了一种基于类传播分布的关系近邻分类方法。该方法采用二阶马尔可夫假设,分类时考虑来自未标记结点邻居的邻居的影响,并通过计算传播类别向量和传... 基于同质性假设的关系分类方法对异质性网络分类性能较差,针对异质性网络的分类问题提出了一种基于类传播分布的关系近邻分类方法。该方法采用二阶马尔可夫假设,分类时考虑来自未标记结点邻居的邻居的影响,并通过计算传播类别向量和传播参考向量使结点间的影响进行传递,结合松弛标注的协作推理方法不断更新分类结果直至类分布收敛。对比实验结果表明,本文方法在异质性网络分类上具有较高的分类精度。 展开更多
关键词 人工智能 异质性网络分类 传播分布关系近邻分类 协作推理
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基于图像处理技术的浮游生物自动分类研究 被引量:12
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作者 杨榕 张荣 孙松 《计算机仿真》 CSCD 2006年第5期167-170,共4页
目前利用图象处理和模式识别技术进行浮游生物的自动分类与计数是一个研究热点,该文根据浮游蚤类图像的特点,设计了一种自动分类计数算法。该算法首先通过有效的分割手段将蚤类个体从背景区域中提取出来;然后计算与其生物学特征相关的... 目前利用图象处理和模式识别技术进行浮游生物的自动分类与计数是一个研究热点,该文根据浮游蚤类图像的特点,设计了一种自动分类计数算法。该算法首先通过有效的分割手段将蚤类个体从背景区域中提取出来;然后计算与其生物学特征相关的形状和纹理特征参量;最后选择特征参量输入神经网络分类器对不同蚤类进行分类和计数。样本主要采集自胶州湾海域,图像通过zeiss显微图像采集系统获取。实验证明,由于研究目标明确,算法简单有效,取得了很好的分类计数效果,很大程度上减轻了人工分类计数的工作量。 展开更多
关键词 样本计数 图像分割 误差反向传播神经网络分类
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手机媒体及其传播形态再界定
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作者 李亚玲 《东南传播》 2012年第11期28-30,共3页
当下手机媒体的发展已经渐趋成熟,此时再来重新对其进行本体性的探讨则更易认清其"真面目"。对于如何分辨手机的复杂身份,本文遵循手机的技术形态,将其划分为移动个人通信、移动个人互联、移动公共通信和移动公共互联四种传... 当下手机媒体的发展已经渐趋成熟,此时再来重新对其进行本体性的探讨则更易认清其"真面目"。对于如何分辨手机的复杂身份,本文遵循手机的技术形态,将其划分为移动个人通信、移动个人互联、移动公共通信和移动公共互联四种传播形态,其中只有移动公共通信和移动公共互联才属于真正意义上的"手机媒体"。 展开更多
关键词 手机媒体 大众传播 手机传播形态分类
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基于BAS-BP分类器模型的电压暂降源识别 被引量:7
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作者 叶筱怡 刘海涛 +1 位作者 吕干云 郝思鹏 《电力工程技术》 北大核心 2022年第1期77-83,共7页
为提高不同电压暂降扰动源的识别正确率,对电压暂降进行有效治理,提出一种利用天牛须搜索(BAS)算法和反向传播(BP)神经网络构建BAS-BP分类器模型的电压暂降源识别方法。文中应用改进S变换提取16个特征指标,组成电压暂降源识别指标体系,... 为提高不同电压暂降扰动源的识别正确率,对电压暂降进行有效治理,提出一种利用天牛须搜索(BAS)算法和反向传播(BP)神经网络构建BAS-BP分类器模型的电压暂降源识别方法。文中应用改进S变换提取16个特征指标,组成电压暂降源识别指标体系,为消除冗余信息对分类结果的影响,利用组合赋权法筛选出9个指标作为分类器的输入量。通过BAS算法对BP神经网络的初始权值和阈值寻优,构建BAS-BP分类器模型,实现对配电网不同类型电压暂降源的识别。仿真结果表明,该分类器模型具有一定的抗噪能力与适用性,并且与常规分类器模型相比,具有更好的分类效果。 展开更多
关键词 电压暂降 改进S变换 组合赋权 天牛须搜索-反向传播(BAS-BP)分类 分类识别 反向传播(BP)神经网络
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Social Network Information Propagation Model Based on Individual Behavior 被引量:9
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作者 Lejun Zhang Hongjie Li +1 位作者 Chunhui Zhao Xiaoying Lei 《China Communications》 SCIE CSCD 2017年第7期78-92,共15页
In this paper, we discuss building an information dissemination model based on individual behavior. We analyze the individual behavior related to information dissemination and the factors that affect the sharing behav... In this paper, we discuss building an information dissemination model based on individual behavior. We analyze the individual behavior related to information dissemination and the factors that affect the sharing behavior of individuals, and we define and quantify these factors. We consider these factors as characteristic attributes and use a Bayesian classifier to classify individuals. Considering the forwarding delay characteristics of information dissemination, we present a random time generation method that simulates the delay of information dissemination. Given time and other constraints, a user might not look at all the information that his/her friends published. Therefore, this paper proposes an algorithm to predict information visibility, i.e., it estimates the probability that an individual will see the information. Based on the classification of individual behavior and combined with our random time generation and information visibility prediction method, we propose an information dissemination model based on individual behavior. The model can be used to predict the scale and speed of information propagation. We use data sets from Sina Weibo to validate and analyze the prediction methods of the individual behavior and information dissemination model based on individual behavior. A previously proposedinformation dissemination model provides the foundation for a subsequent study on the evolution of the network and social network analysis. Predicting the scale and speed of information dissemination can also be used for public opinion monitoring. 展开更多
关键词 social network information propagation individual behavior propagation delay
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Pancreatic cancer–Neoadjuvant therapy 被引量:2
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作者 R. Krempien M. W. Munter +1 位作者 W. Harms J. Debus 《The Chinese-German Journal of Clinical Oncology》 CAS 2007年第2期162-169,共8页
In spite of the high mortality in pancreatic cancer, significant progress is being made. This review discusses multimodality therapy for patients with pancreatic cancer. Surgical therapy currently offers the only pote... In spite of the high mortality in pancreatic cancer, significant progress is being made. This review discusses multimodality therapy for patients with pancreatic cancer. Surgical therapy currently offers the only potential monomodal cure for pancreatic adenocarcinoma. However only 10%–20% of patients present with tumors that are amenable to resection, and even after resection of localized cancers, long term survival is rare. The addition of chemoradiation therapy significantly increases median survival. To achieve long-term success in treating this disease it is therefore increasingly important to identify effective neoadjuvant/adjuvant multimodality therapies. Preoperative chemoradiation for potentially resectable pancreatic cancer has the following advantages: (1) neoadjuvant treatment would eliminate the delay of adjuvant treatment due to postoperative complications; (2) neoadjuvant treatment could avoid unnecessary surgery for patients with metastatic disease evident on restaging after neoadjuvant therapy; (3) downstaging after neoadjuvant therapy may increase the likelihood for negative surgical margins; and (4) neoadjuvant treatment could prevent peritoneal tumor cell implantation and dissemination caused during surgery. This review systematically summarizes the current status, controversies, and prospects of neoadjuvant treatment of pancreatic cancer. 展开更多
关键词 pancreatic cancer neoadjuvant therapy ADVANTAGE
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Classification and Identification of Nuclear, Biological or Chemical Agents Taken from Remote Sensing Image by Using Neural Network
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作者 Said El Yamani Samir Zeriouh Mustapha Boutahri Ahmed Roukhe 《Journal of Physical Science and Application》 2014年第3期177-182,共6页
In the context of new risks and threats associated to nuclear, biological and chemical (NBC) attacks, and given the shortcomings of certain analytical methods such as principal component analysis (PCA), a neural n... In the context of new risks and threats associated to nuclear, biological and chemical (NBC) attacks, and given the shortcomings of certain analytical methods such as principal component analysis (PCA), a neural network approach seems to be more accurate. PCA consists in projecting the spectrum of a gas collected from a remote sensing system in, firstly, a three-dimensional space, then in a two-dimensional one using a model of Multi-Layer Perceptron based neural network. It adopts during the learning process, the back propagation algorithm of the gradient, in which the mean square error output is continuously calculated and compared to the input until it reaches a minimal threshold value. This aims to correct the synaptic weights of the network. So, the Artificial Neural Network (ANN) tends to be more efficient in the classification process. This paper emphasizes the contribution of the ANN method in the spectral data processing, classification and identification and in addition, its fast convergence during the back propagation of the gradient. 展开更多
关键词 Artificial neural networks classification identification principal component analysis multi-layer perceptron back propagation of the gradient.
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巧借“他”视角,讲好“村”故事
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作者 万姗姗 《新闻战线》 2024年第13期57-59,共3页
提高国际传播效能,需细分受众群体,实施分层传播、分类传播、分群传播,推进中国故事和中国声音的区域化表达、分众化传播。华声在线挖掘“他者”视角,推出《村里来了个老外》系列视频报道,邀请外国嘉宾深入乡村,向全球网民讲述湖南乡村... 提高国际传播效能,需细分受众群体,实施分层传播、分类传播、分群传播,推进中国故事和中国声音的区域化表达、分众化传播。华声在线挖掘“他者”视角,推出《村里来了个老外》系列视频报道,邀请外国嘉宾深入乡村,向全球网民讲述湖南乡村的发展和变化,不断提升国际传播的亲和力与实效性。 展开更多
关键词 国际传播 分层传播 分类传播 分群传播
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Differential efficiency of a begomovirus to cross the midgut of different species of whiteflies results in variation of virus transmission by the vectors 被引量:2
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作者 Lilong Pan Qunfang Chen +4 位作者 Tao Guo Xinru Wang Ping Li Xiaowei Wang Shusheng Liu 《Science China(Life Sciences)》 SCIE CAS CSCD 2018年第10期1254-1265,共12页
Begomoviruses are important crop viral disease agents, and they are transmitted by whiteflies of the Bemisia tabaci complex.Although the transmission of begomoviruses by whiteflies has been studied for many years, the... Begomoviruses are important crop viral disease agents, and they are transmitted by whiteflies of the Bemisia tabaci complex.Although the transmission of begomoviruses by whiteflies has been studied for many years, the mechanisms governing differential transmission of begomoviruses by different species of the Bemisia tabaci complex remain largely unknown. Here we firstly compared the transmission efficiency of tobacco curly shoot virus(TbCSV) by four species of the B. tabaci complex and found that Asia II 1 transmitted this virus with the highest efficiency, whereas MEAM1 transmitted it with the lowest. Next, by performing quantitative analysis of virus and immune-fluorescence detection, we found that the efficiency of TbCSV to cross the midgut wall was higher in Asia II 1 than in MEAM1. Finally, we set the quantities of virions in the haemolymph to the same level in Asia II 1 and MEAM1 via injection and then compared their capacity in TbCSV transmission, and found that the difference in TbCSV transmission between them became smaller. Taken together, our findings suggest that the efficiency of a begomovirus to cross the midgut wall of a whitefly to reach the vector's haemolymph plays a significant role in determining transmission of the virus. 展开更多
关键词 BEGOMOVIRUS Bemisia tabaci differential transmission MIDGUT
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