为提升序列化推荐模型在重复消费场景中的性能,增强推荐算法对于时间的敏感程度,减轻信息过载带来的负面影响,文中提出了基于自注意力机制的面向重复消费场景的序列化推荐算法SLSASRec。文中着重对重复消费场景中的时间间隔进行研究,对...为提升序列化推荐模型在重复消费场景中的性能,增强推荐算法对于时间的敏感程度,减轻信息过载带来的负面影响,文中提出了基于自注意力机制的面向重复消费场景的序列化推荐算法SLSASRec。文中着重对重复消费场景中的时间间隔进行研究,对于用户的历史消费时间采用自注意力机制建模,在霍克斯过程中设计特定的时间核函数用以捕获用户的长期与短期偏好,同时在基础强度获取部分使用基线模型SASRec获得个性化建模。通过实验分析,在公共数据集Grocery and Gourmet Food的HR和NDCG指标上较对比的基线算法SASRec分别提升5.19%和5.02%,证明了算法可以有效预测用户的重复消费行为。展开更多
Three intergeneric somatic hybrids (wheat(+) Haynaldia villosa, wheat(+) Bromus inermis, wheat(+) Agropyron elongatum) and one interfamily somatic hybrid between Vitis vinifera and Bupleurum scorzonerifollium were ana...Three intergeneric somatic hybrids (wheat(+) Haynaldia villosa, wheat(+) Bromus inermis, wheat(+) Agropyron elongatum) and one interfamily somatic hybrid between Vitis vinifera and Bupleurum scorzonerifollium were analyzed by PCR with two kinds of primers.The results showed that in the electrophoresis pattern of the PCR products the somatic hybrids had the characteristic bands of two parents and (or) new bands.This research reveals that PCR analysis with 5S rDNA spacer sequence primers can be used for the identification of somatic hybrids at the molecular level and it is a good method because of its simplicity and good reproducibility.展开更多
Use of 16S-23S intergenic transcribed spacer (ITS) variability,as a relatively new method,is becoming an important supplement to the molecular methods based on 16S rRNA for which has a fairly constant size and is not ...Use of 16S-23S intergenic transcribed spacer (ITS) variability,as a relatively new method,is becoming an important supplement to the molecular methods based on 16S rRNA for which has a fairly constant size and is not divergent enough to give good separation in close relationships. This paper summarizes the structures and characteristics of ITS regions that are extremely variable in copy number,length and sequence per genome. The ITS region can be amplified easily taking advantage of conserved nucleotide stretches at the 5’ of the 16S and 3’ of the 23S gene,and the amplicon can contain different amounts of the 16S rDNA by choosing primers at different conserved areas within this gene. These primers are listed and discussed for perfecting the methodology of ITS. Furthermore,some recent progresses on the taxonomy,identification and community analysis of bacteria by means of ITS in epidemiology,ecology and artificial environment are reviewed,as well,the virtues and limitations of that method are discussed. Fig 2,Tab 1,Ref展开更多
文摘为提升序列化推荐模型在重复消费场景中的性能,增强推荐算法对于时间的敏感程度,减轻信息过载带来的负面影响,文中提出了基于自注意力机制的面向重复消费场景的序列化推荐算法SLSASRec。文中着重对重复消费场景中的时间间隔进行研究,对于用户的历史消费时间采用自注意力机制建模,在霍克斯过程中设计特定的时间核函数用以捕获用户的长期与短期偏好,同时在基础强度获取部分使用基线模型SASRec获得个性化建模。通过实验分析,在公共数据集Grocery and Gourmet Food的HR和NDCG指标上较对比的基线算法SASRec分别提升5.19%和5.02%,证明了算法可以有效预测用户的重复消费行为。
文摘Three intergeneric somatic hybrids (wheat(+) Haynaldia villosa, wheat(+) Bromus inermis, wheat(+) Agropyron elongatum) and one interfamily somatic hybrid between Vitis vinifera and Bupleurum scorzonerifollium were analyzed by PCR with two kinds of primers.The results showed that in the electrophoresis pattern of the PCR products the somatic hybrids had the characteristic bands of two parents and (or) new bands.This research reveals that PCR analysis with 5S rDNA spacer sequence primers can be used for the identification of somatic hybrids at the molecular level and it is a good method because of its simplicity and good reproducibility.
文摘Use of 16S-23S intergenic transcribed spacer (ITS) variability,as a relatively new method,is becoming an important supplement to the molecular methods based on 16S rRNA for which has a fairly constant size and is not divergent enough to give good separation in close relationships. This paper summarizes the structures and characteristics of ITS regions that are extremely variable in copy number,length and sequence per genome. The ITS region can be amplified easily taking advantage of conserved nucleotide stretches at the 5’ of the 16S and 3’ of the 23S gene,and the amplicon can contain different amounts of the 16S rDNA by choosing primers at different conserved areas within this gene. These primers are listed and discussed for perfecting the methodology of ITS. Furthermore,some recent progresses on the taxonomy,identification and community analysis of bacteria by means of ITS in epidemiology,ecology and artificial environment are reviewed,as well,the virtues and limitations of that method are discussed. Fig 2,Tab 1,Ref
