检索结果-南通市图书馆

基于并联残差膨胀卷积网络的短文本实体关系联合抽取

在线全文

学校读者我要写书评

暂无评论

现代电子技术 2025年第2期48卷 169-178页

作者：曾伟奚雪峰崔志明苏州科技大学电子与信息工程学院江苏苏州215000 苏州市虚拟现实智能交互及应用技术重点实验室江苏苏州215000 苏州科技大学智慧城市研究院江苏苏州215000

关系抽取旨在从文本中提取出实体对之间存在的语义关系,但现有的关系抽取方法均存在关系冗余和重叠的不足,尤其是对于短文本,会因上下文信息不足而出现语义信息不足和噪声大等问题。此外,一般流水线式的关系抽取模型还存在误差传递问题... 详细信息

关系抽取旨在从文本中提取出实体对之间存在的语义关系,但现有的关系抽取方法均存在关系冗余和重叠的不足,尤其是对于短文本,会因上下文信息不足而出现语义信息不足和噪声大等问题。此外,一般流水线式的关系抽取模型还存在误差传递问题。为此,文中提出一种基于并联残差膨胀卷积网络的短文本实体关系联合抽取方法。该方法利用BERT生成语义特征信息,采用并联残差膨胀卷积网络来捕获语义信息,从而提升上下文信息的捕获能力并缓解噪声。联合抽取框架通过抽取潜在关系来过滤无关关系,然后再抽取实体以预测三元组,从而解决关系冗余和重叠问题,并提高计算效率。实验结果表明,与现有的主流模型相比,所提模型在三个公共数据集NYT、WebNLG和DuIE上的F1值分别为90.9%、91.3%和73.5%,相较于基线模型均有提升,验证了该模型的有效性。

关键词：实体关系抽取短文本残差膨胀卷积网络语义特征联合抽取 BERT编码器

THE ANALYSIS OF CHILD′S GROWTH TREND DURING 1958～1995 IN xi′AN CITY

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 1999年第2期13卷 182-185页

作者： Hou Rulan,Tang xiaohongDept. of Epidemiology, xi′an Medical University, xi′an 710061 Department of Child and Adolescent Health, xi′an Medical University, xi′an 710061 Dept. of Child and Adolescent Health Xi'an Medical University Xi'an 710061 China

The paper analyzed the growth level and velocity to find the growth trend with the data collected in 8 investigations on growth of children aged 7～17 years in 1958～1995 in xi′an. The results showed that child′s growth level was elevated with the passage of years and was the lowest in 1962, the highest in 1995 during the 38 years. The height of boy of the same age in 1995 has average increased by 9 59 cm over 1958 and girl 8 38 cm. The weight of boy of the same age in 1995 has averagely increased by 8 35 kg over 1958 and girl 5 90 kg. The chest girth of boy of the same age in 1995 has average increased by 5 69 cm over 1958 and girl 4 66 cm. The growth level of children aged 9～15 years had greater increase than others in 7～17 years of age. The average increment per 10 years of boy's height was 2 57 cm and girl's 2 26 cm. The average increment of per 10 years of boy's weight was 2 17 kg and girl's 1 56 kg. The average increment of per 10 years of boy's chest girth was 1 50 cm and girl's 1 23 cm. The analysis of the growth velocity in different period during 38 years showed the velocity in 1958～1962 was a negative value and indicated a growth retard, but the velocity in 1962～1964 was the fastest and indicated a catch up growth. And then, growth velocities of height, weight and chest girth were different in different period. The analysis of the growth curves of height, weight and chest girth showed that the 2 cross ages were 1～3 years of age ahead of time and menarche and emission also were ahead of time that during the 38 years indicated there is a child's growth acceleration in xi′an and the trend of child's growth acceleration could continue if there are more and better nourishment, sports requisites, health care and housing conditions.

关键词： child growth growth retard catch up growth growth trend

基于点云语义分割的猕猴桃冠层叶密度测量方法

在线全文

学校读者我要写书评

暂无评论

农机化研究 2025年第2期47卷 27-35页

作者：韩皓名石复习席新明西北农林科技大学机械与电子工程学院陕西杨凌712100

提出了一种基于LiDAR的猕猴桃果园叶密度测量方法,旨在为猕猴桃果园冠层喷药提供更精确的指导。首先,使用激光雷达扫描10个密度不同的猕猴桃冠层建立点云数据集,利用RandLA-Net神经网络模型并通过6折交叉验证的方法对猕猴桃冠层的树叶... 详细信息

提出了一种基于LiDAR的猕猴桃果园叶密度测量方法,旨在为猕猴桃果园冠层喷药提供更精确的指导。首先,使用激光雷达扫描10个密度不同的猕猴桃冠层建立点云数据集,利用RandLA-Net神经网络模型并通过6折交叉验证的方法对猕猴桃冠层的树叶、树枝和T型架点云进行语义分割;然后,计算仅包含树叶信息的冠层点云表面积,通过与人工落叶后的实测冠层叶属性(叶面积、叶片数)进行回归分析比较,得到冠层叶点云表面积与真实冠层叶属性的关系;最后,将3 m×3 m的猕猴桃冠层区域划分为400个225 cm^(2)的小网格区域,用以生成冠层叶密度图。结果表明:RandLA-Net网络模型能够有效地对猕猴桃冠层的树枝、树叶与T型架点云进行分割,模型平均总体精度OA达到92%以上,平均交并比mIoU为81.4%,冠层实测叶面积与冠层叶点云表面积的回归分析中获得了较高的相关性R=0.78,回归方程为y=1.491x+8315。对于每个猕猴桃冠层点云数据,通过Alpha-shape算法计算网格区域的冠层体积和预测网格真实叶面积的方法生成冠层叶密度图。所开发的基于点云语义分割的猕猴桃冠层叶密度测量方法,各项指标均符合预期要求,可以为果园冠层喷药提供更精准的指导。

关键词：猕猴桃园冠层叶密度点云语义分割深度学习精准喷雾

维普期刊数据库博看期刊

Bilinear forms with trace functions over arbitrary sets and applications to Sato-Tate

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2023年第12期66卷 2819-2834页

作者： Ping xi School of Mathematics and Statistics Xi'an Jiaotong UniversityXi'an 710049China

We prove non-trivial upper bounds for general bilinear forms with trace functions of bountiful sheaves,where the supports of two variables can be arbitrary subsets in F_(p) of suitable *** essentially recovers the Polya-Vinogradov range,and also applies to symmetric powers of Kloosterman sums and Frobenius traces of elliptic *** the case of hyper-Kloosterman sums,we can beat the Pólya-Vinogradov barrier by combining additive combinatorics with a deep result of Kowalski,Michel and Sawin(2017) on sum-products of Kloosterman *** Sato-Tate distributions of Kloosterman sums and Frobenius traces of elliptic curves in sparse families are also concluded.

关键词： bilinear forms l-adic sheaves Riemann Hypothesis over finite fields Sato-Tate distribution Kloosterman sums elliptic curves

Frobenius bimodules and flat-dominant dimensions

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2021年第1期64卷 33-44页

作者： Changchang xi School of Mathematical Sciences Capital Normal UniversityBeijing100048China

We establish relations between Frobenius parts and between flat-dominant dimensions of algebras linked by Frobenius *** is motivated by the Nakayama conjecture and an approach of MartinezVilla to the Auslander-Reiten conjecture on stable *** show that the Frobenius parts of Frobenius extensions are again Frobenius ***,let A and B be finite-dimensional algebras over a field k,and let domdim(_AX)stand for the dominant dimension of an A-module ***_BM_A is a Frobenius bimodule,then domdim(A)domdim(_BM)and domdim(B)domdim(_AHom_B(M,B)).In particular,if B■A is a left-split(or right-split)Frobenius extension,then domdim(A)=domdim(B).These results are applied to calculate flat-dominant dimensions of a number of algebras:shew group algebras,stably equivalent algebras,trivial extensions and Markov *** also prove that the universal(quantised)enveloping algebras of semisimple Lie algebras are QF-3 rings in the sense of Morita.

关键词： dominant dimension extension of algebras Frobenius bimodule Frobenius part universal enveloping algebra

Single-cell analyses of circulating tumor cells

在线全文

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2015年第3期12卷 184-192页

作者： xi-xi Chen Fan Bai Biodynamic Optical Imaging Center School of Life Science Peking University

Circulating tumor cells(CTCs) are a population of tumor cells mediating metastasis, which results in most of the cancer related deaths. The number of CTCs in the peripheral blood of patients is rare, and many platforms have been launched for detection and enrichment of CTCs. Enumeration of CTCs has already been used as a prognosis marker predicting the survival rate of cancer patients. Yet CTCs should be more potential. Studies on CTCs at single cell level may help revealing the underlying mechanism of tumorigenesis and metastasis. Though far from developed, this area of study holds much promise in providing new clinical application and deep understanding towards metastasis and cancer development.

关键词： Circulating tumor cells (CTCs) single cell sequencing metastasis

Ratiometric mode with dyads: a breakthrough in dynamic trapping and quantification for redox regulation in living cells

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2015年第3期58卷 434-435页

作者： Zhen xi College of Chemistry Nankai University

Redox-based post-translational modification of protein thiols has become an attractive strategy in cellular homeostasis and cell signaling. Due to the reductive end of the redox buffer network, the vicinal dithiol-containing proteins （VDPs） maintains an appropriate oxidation-reduction state of proteins through the reversible transformation from vicinal dithiols to disulfide, which is responsible for a variety of diseases, such as cancer, diabetes and neuro-degeneration.

关键词：氧化还原状态活细胞调控诱捕比例蛋白质二硫醇细胞信号

Densification of the packing structure under vibrations

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2013年第5期20卷 499-503页

作者： xi-zhong An School of Materials and Metallurgy Northeastern University

Two packing structures with the maximum packing densities of 0.64 and 0.74 for the amorphous state and crystalline state, respectively, were numerically reproduced in the packing densification of equal spheres subjected to one- dimensional and three-dimensional vibrations using the discrete element method （DEM）, and the results were physically validated. These two packing structures were analyzed in terms of coordination number （CN）, radial distribution function （RDF）, angular distribution function （ADF）, and pore size distribution （Voronoi/Delaunay tessellation）. It is shown that CN distributions have the peak values of 7 and 12 for the amorphous state and crystalline state, respectively. RDF and ADF distributions show isolated peaks and orientation preferences for the crystalline state, indicating the long range and angle correlation among particles commonly observed in the crystalline state. Voronoi/Delaunay tessellation also shows smaller and narrower pore size distribution for the crystalline state.

关键词： particle packing densification vibrations discrete element method

在线全文

学校读者我要写书评

暂无评论

王阮生平事迹补考

湖北科技学院学报 2025年第1期45卷 52-59,F0002页

作者：王可喜湖北科技学院人文与传媒学院湖北咸宁437100

拙文《南宋诗人王阮生平事迹考》发表在《长江学术》2009年第2期上。其中有诸多环节没能考实,特别是登进士第后授官时间,永州教授任上入京拜见王炎及献书阙下,考亭拜见朱熹及从朱子学,昌国归来线路及歌咏,移知抚州及隐居庐山时间等,这... 详细信息

拙文《南宋诗人王阮生平事迹考》发表在《长江学术》2009年第2期上。其中有诸多环节没能考实,特别是登进士第后授官时间,永州教授任上入京拜见王炎及献书阙下,考亭拜见朱熹及从朱子学,昌国归来线路及歌咏,移知抚州及隐居庐山时间等,这些细节,今随着史料的深度发掘和新的发现,都得到了考实、还原。

关键词：王阮生平事迹补考