A Dark Network is a network that cannot be accessed through tradition means. Once uncovered, to any degree, dark network analysis can be accomplished using the SNA software. The output of SNA software includes many me...A Dark Network is a network that cannot be accessed through tradition means. Once uncovered, to any degree, dark network analysis can be accomplished using the SNA software. The output of SNA software includes many measures and metrics. For each of these measures and metric, the output in ORA additionally provides the ability to obtain a rank ordering of the nodes in terms of these measures. We might use this information in decision making concerning best methods to disrupt or deceive a given dark network. In the Noordin Dark network, different nodes were identified as key nodes based upon the metric used. Our goal in this paper is to use methodologies to identify the key players or nodes in a Dark Network in a similar manner as we previously proposed in social networks. We apply two multi-attribute decision making methods, a hybrid AHP & TOPSIS and an average weighted ranks scheme, to analyze these outputs to find the most influential nodes as a function of the decision makers’ inputs. We compare these methods by illustration using the Noordin Dark Network with seventy-nine nodes. We discuss sensitivity analysis that is applied to the criteria weights in order to measure the change in the ranking of the nodes.展开更多
建模互联网中热点话题的传播过程具有重要的意义和价值,该文以网络热点话题为研究对象,基于自激霍克斯过程提出一个话题传播模型(Self-Exciting Point Process Model,SEPPM).SEPPM利用用户参与话题的自激效应,将话题传播过程建模为一个...建模互联网中热点话题的传播过程具有重要的意义和价值,该文以网络热点话题为研究对象,基于自激霍克斯过程提出一个话题传播模型(Self-Exciting Point Process Model,SEPPM).SEPPM利用用户参与话题的自激效应,将话题传播过程建模为一个随机点过程.同时,SEPPM也考虑了话题传播的外部因素,综合形成话题传播模型.为了验证该模型的有效性,该文从仿真和实证两个角度分别进行了大量的实验比较,提出话题仿真算法,仿真结果说明SEPPM可以生成多种符合热点话题传播特征的模式.实际数据上的结果说明SEPPM不仅能够很好地拟合真实话题的传播过程,还能够有效地预测话题传播趋势.展开更多
社交网络中,消息的爆发预测属于社交网络流行动态分析的范畴,是社会计算领域的研究热点之一.通过利用基于深度循环神经网络对社交消息的传播过程进行建模,提出了SMOP(social messages outbreak prediction model based on recurrent neu...社交网络中,消息的爆发预测属于社交网络流行动态分析的范畴,是社会计算领域的研究热点之一.通过利用基于深度循环神经网络对社交消息的传播过程进行建模,提出了SMOP(social messages outbreak prediction model based on recurrent neural network)模型.与传统的基于机器学习的模型相比,SMOP直接对消息转发的到达过程进行建模,避免了传统方法中繁琐的特征工程;与基于点随机过程的模型相比,SMOP可以自动学习消息传播过程的速率函数,不需要手动定义消息传播速率的特征函数,具有较强的数据场景适应性.另外,SMOP采用了时间向量和用户向量的输入表示方法,将时间的周期性和用户的兴趣偏好建模到传播过程之中,提升了SMOP的预测效果.在Twitter和新浪微博数据集上的实验结果均表明,SMOP具有优良的数据适应能力,可以在消息传播的早期(0.5h),以较高的F1值预测某条社交消息是否爆发,验证了模型的有效性.展开更多
微博实体链接是把微博中给定的指称链接到知识库的过程,广泛应用于信息抽取、自动问答等自然语言处理任务(Natural language processing,NLP).由于微博内容简短,传统长文本实体链接的算法并不能很好地用于微博实体链接任务.以往研究大...微博实体链接是把微博中给定的指称链接到知识库的过程,广泛应用于信息抽取、自动问答等自然语言处理任务(Natural language processing,NLP).由于微博内容简短,传统长文本实体链接的算法并不能很好地用于微博实体链接任务.以往研究大都基于实体指称及其上下文构建模型进行消歧,难以识别具有相似词汇和句法特征的候选实体.本文充分利用指称和候选实体本身所含有的语义信息,提出在词向量层面对任务进行抽象建模,并设计一种基于词向量语义分类的微博实体链接方法.首先通过神经网络训练词向量模板,然后通过实体聚类获得类别标签作为特征,再通过多分类模型预测目标实体的主题类别来完成实体消歧.在NLPCC2014公开评测数据集上的实验结果表明,本文方法的准确率和召回率均高于此前已报道的最佳结果,特别是实体链接准确率有显著提升.展开更多
文摘A Dark Network is a network that cannot be accessed through tradition means. Once uncovered, to any degree, dark network analysis can be accomplished using the SNA software. The output of SNA software includes many measures and metrics. For each of these measures and metric, the output in ORA additionally provides the ability to obtain a rank ordering of the nodes in terms of these measures. We might use this information in decision making concerning best methods to disrupt or deceive a given dark network. In the Noordin Dark network, different nodes were identified as key nodes based upon the metric used. Our goal in this paper is to use methodologies to identify the key players or nodes in a Dark Network in a similar manner as we previously proposed in social networks. We apply two multi-attribute decision making methods, a hybrid AHP & TOPSIS and an average weighted ranks scheme, to analyze these outputs to find the most influential nodes as a function of the decision makers’ inputs. We compare these methods by illustration using the Noordin Dark Network with seventy-nine nodes. We discuss sensitivity analysis that is applied to the criteria weights in order to measure the change in the ranking of the nodes.
文摘建模互联网中热点话题的传播过程具有重要的意义和价值,该文以网络热点话题为研究对象,基于自激霍克斯过程提出一个话题传播模型(Self-Exciting Point Process Model,SEPPM).SEPPM利用用户参与话题的自激效应,将话题传播过程建模为一个随机点过程.同时,SEPPM也考虑了话题传播的外部因素,综合形成话题传播模型.为了验证该模型的有效性,该文从仿真和实证两个角度分别进行了大量的实验比较,提出话题仿真算法,仿真结果说明SEPPM可以生成多种符合热点话题传播特征的模式.实际数据上的结果说明SEPPM不仅能够很好地拟合真实话题的传播过程,还能够有效地预测话题传播趋势.
文摘社交网络中,消息的爆发预测属于社交网络流行动态分析的范畴,是社会计算领域的研究热点之一.通过利用基于深度循环神经网络对社交消息的传播过程进行建模,提出了SMOP(social messages outbreak prediction model based on recurrent neural network)模型.与传统的基于机器学习的模型相比,SMOP直接对消息转发的到达过程进行建模,避免了传统方法中繁琐的特征工程;与基于点随机过程的模型相比,SMOP可以自动学习消息传播过程的速率函数,不需要手动定义消息传播速率的特征函数,具有较强的数据场景适应性.另外,SMOP采用了时间向量和用户向量的输入表示方法,将时间的周期性和用户的兴趣偏好建模到传播过程之中,提升了SMOP的预测效果.在Twitter和新浪微博数据集上的实验结果均表明,SMOP具有优良的数据适应能力,可以在消息传播的早期(0.5h),以较高的F1值预测某条社交消息是否爆发,验证了模型的有效性.
文摘微博实体链接是把微博中给定的指称链接到知识库的过程,广泛应用于信息抽取、自动问答等自然语言处理任务(Natural language processing,NLP).由于微博内容简短,传统长文本实体链接的算法并不能很好地用于微博实体链接任务.以往研究大都基于实体指称及其上下文构建模型进行消歧,难以识别具有相似词汇和句法特征的候选实体.本文充分利用指称和候选实体本身所含有的语义信息,提出在词向量层面对任务进行抽象建模,并设计一种基于词向量语义分类的微博实体链接方法.首先通过神经网络训练词向量模板,然后通过实体聚类获得类别标签作为特征,再通过多分类模型预测目标实体的主题类别来完成实体消歧.在NLPCC2014公开评测数据集上的实验结果表明,本文方法的准确率和召回率均高于此前已报道的最佳结果,特别是实体链接准确率有显著提升.