Search

医学命名实体识别是从医学文本中抽取出指代特定概念的医学实体，是医学信息抽取的基础性任务。当前主流的医学命名实体识别算法普遍基于深度学习技术，需要大量高质量的标注样本进行模型训练。然而医学领域的样本标注成本很高，严重限制了模型性能的提升。为了降低模型对标注样本的需求，一种重要的方法是基于主动学习思想，设计合理的样本采样策略，自动选取高价值样本优先标注，从而使模型提前收敛。现有算法普遍基于样本长度、样本识别的概率等特征来设计采样策略，忽视了样本类别分布这一深层次特征，导致命名实体识别召回率较低。提出了一种基于概率分布差异的主动学习算法，通过计算样本间的概率分布差异来评估样本的标注价值，并在标注样本更新时动态优化模型。在真实的医学检查文本上的实验表明，相比已有算法，达到同等的模型性能，该算法所需要的标注数据可缩减10%以上；在相同标注样本量的情况下，本算法F1值提高5%以上。

In shellfish culturing and breeding practice, the width of shell growth lines is an important index to measure the growth rate of shellfish, and anal angle radial rib is the part with the widest growth lines. In order to explore the feasibility of taking anal angle radial rib length as a typical growth trait, this research analyzed the correlation between anal angle radial rib length （X1） and other growth traits, such as shell length （X2）, shell height （X3）, total height （X4）, shell width （X5）, live body weight （Y1）, soft tissue weight （Y2） and shell weight （Y3） of Hyriopsis cumingii at different ages and conducted the path analysis of body size traits to body weight traits （live body weight, soft tissue weight and shell weight）. The results of correlation analysis showed that there was a significant positive correlation between anal angle radial rib length and body weight in the first to third instars of H. cumingii. The correlation coefficient between shell length and live body weight was the highest in the first and second instars of mussel, while the correlation coefficient between anal angle radiating rib length and live body weight was the highest in the third instar of mussel. In addition, the correlation coefficient between anal angle radiating rib length and live body weight, soft tissue weight and shell weight showed an increasing trend with the increase of age. The data of path analysis and multiple regression analysis displayed that the main factors affecting the live body weight of 1 to 3 year old were anal angle radial rib length, shell length and shell width, the main factors affecting the soft tissue weight of 3 year old were shell length and shell width, the main factors affecting the shell quality of 1 and 2 year old mussel were shell length and shell width, and the main factors affecting the shell quality of the third instar mussel were anal angle radiating rib length, shell length and shell width. In conclusion, anal angle radial rib length, together with shell length and shell width, can be used as a new typical growth trait to represent the growth rate of H. cumingii. [ABSTRACT FROM AUTHOR]

Copyright of Big Data Research (2096-0271) is the property of Beijing Xintong Media Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agricultural Big Data is the property of Journal of Agricultural Big Data Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] The present paper aimed to fully understand the genetic diversity and phylogenetics of Xinjiang indigenous sheep breeds, and provide theoretical basis for breeds, conservation and utilization. [Method] The squences of mitochondrial DNA (mtDNA) Cylb of 13 Xinjiang indigenous sheep breeds were amplified and sequenced. [Result] It was found that these breeds had abundant genetic diversity, except Hotan sheep. Neutral test showed that Hotan sheep had experienced population expansion. The genetic distance between Hotan sheep breeds and Qira black sheep breeds was the closest, and between Hotan sheep breeds and Bachu sheep breeds was the furthest. There were relatively far genetic distance between Bachu sheep breeds and other breeds. 13 indigenous sheep breeds were divided into 3 branches by haplotype network. After AMOVA molecular variation analysis, genetic variation between populations and within populations was 91.33% and 8.67%, respectively. There was no significant genetic differentiation among populations. [Conclusion] The results showed that there were three matrilineal origins in 13 Xinjiang indigenous sheep breeds. The genetic relationship was basically consistent with the breeding history and geographical distribution. Hotan sheep had low genetic diversity and need to strengthen the protection of germplasm resources. [ABSTRACT FROM AUTHOR]

Copyright of Acta Automatica Sinica is the property of Chinese Academy of Sciences, Institute of Automation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)