事件时序关系识别有助于读者理清文章脉络,把握全局发展趋势,是重要的自然语言理解任务之一。现有的事件时序关系识别方法专注于提取事件触发词前后的局部信息,然而事件句中的事件信息分布较为分散,导致模型在编码过程中丢失部分事件信...事件时序关系识别有助于读者理清文章脉络,把握全局发展趋势,是重要的自然语言理解任务之一。现有的事件时序关系识别方法专注于提取事件触发词前后的局部信息,然而事件句中的事件信息分布较为分散,导致模型在编码过程中丢失部分事件信息。针对上述问题,针对文本特征提出一种双路依存注意力机制来聚合事件句信息,通过单词的父子节点信息构建出双路依存矩阵,将句法信息融入到词嵌入中。将该机制与双向长短期记忆网络(bidirectional long short term memory,Bi-LSTM)结合,可以使事件时序关系模型的性能得到显著提高。该文在越南语数据集与英语数据集上进行对比实验,结果表明所提方法优于主流的神经网络方法。展开更多
The diffusion behavior of polyelectrolytes in dilute salt-free solution is studied through a hybrid mesoscale simulation technique that combines the molecular dynamics method and the multiparticle collision dynamics a...The diffusion behavior of polyelectrolytes in dilute salt-free solution is studied through a hybrid mesoscale simulation technique that combines the molecular dynamics method and the multiparticle collision dynamics approach.To elucidate the effects of hydrodynamic interactions(HI),we compare results for hydrodynamic and random solvents.When HI are taken into account,we find that the chain diffusivity decreases initially and then increases gradually with the increasing strength of the Coulomb interaction.By contrast,when HI are switched off,the electrostatic-dependent diffusivity shows three distinct regions,and a plateau of approximately constant diffusivity manifests between two decreasing regions.The findings reveal that the dynamics of polyelectrolytes in dilute solution depend on the coupling effects of hydrodynamic and Coulomb interactions,and that these dynamics can be understood by considering the conformational changes of chains,the counterion condensation,and the dynamics of counterions.展开更多
文摘事件时序关系识别有助于读者理清文章脉络,把握全局发展趋势,是重要的自然语言理解任务之一。现有的事件时序关系识别方法专注于提取事件触发词前后的局部信息,然而事件句中的事件信息分布较为分散,导致模型在编码过程中丢失部分事件信息。针对上述问题,针对文本特征提出一种双路依存注意力机制来聚合事件句信息,通过单词的父子节点信息构建出双路依存矩阵,将句法信息融入到词嵌入中。将该机制与双向长短期记忆网络(bidirectional long short term memory,Bi-LSTM)结合,可以使事件时序关系模型的性能得到显著提高。该文在越南语数据集与英语数据集上进行对比实验,结果表明所提方法优于主流的神经网络方法。
基金supported by the National Basic Research Program of China(2012CB821500 and 2010CB631102)the National Natural Science Foundation of China(21274153)+1 种基金the support of the National Natural Science Foundation of China(21120102037)Computing Center of Jilin Province for essential support
文摘The diffusion behavior of polyelectrolytes in dilute salt-free solution is studied through a hybrid mesoscale simulation technique that combines the molecular dynamics method and the multiparticle collision dynamics approach.To elucidate the effects of hydrodynamic interactions(HI),we compare results for hydrodynamic and random solvents.When HI are taken into account,we find that the chain diffusivity decreases initially and then increases gradually with the increasing strength of the Coulomb interaction.By contrast,when HI are switched off,the electrostatic-dependent diffusivity shows three distinct regions,and a plateau of approximately constant diffusivity manifests between two decreasing regions.The findings reveal that the dynamics of polyelectrolytes in dilute solution depend on the coupling effects of hydrodynamic and Coulomb interactions,and that these dynamics can be understood by considering the conformational changes of chains,the counterion condensation,and the dynamics of counterions.
