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基于残差注意力网络的医疗命名实体识别方法
Medical Named Entity Recognition Method Based on Residual Attention Networks  [PDF]
王维欣, 徐国愚
Computer Science and Application (CSA) , 2024, DOI: 10.12677/csa.2024.1411221
Abstract: 针对临床医疗记录中的复杂语义实体和长短距离依赖关系识别准确率低的难题，文章提出了一种双向语义与残差注意力网络的医疗文本命名实体识别方法。利用BERT-wwm预训练模型捕捉语义特征，结合双向门控循环单元BiGRU用于处理复杂长程语义关联；增加残差连接的注意力Attention结构，保障专注于关键信息的同时，不会丢失捕捉到的整体序列特征；条件随机场CRF负责最后的序列标注预测，对前序多层神经网络抽取的特征序列进行最优路径解码。实验结果表明，通过本方法能够有效提升命名实体识别的准确率。
Aiming at the challenge of low recognition accuracy for complex semantic entities and long- and short-range dependencies in clinical medical records, this paper proposes a medical text named entity recognition method that integrates bidirectional semantics with a residual attention network. The method leverages the BERT-wwm pre-trained model to capture semantic features and combines it with a Bidirectional Gated Recurrent Unit (BiGRU) to handle complex long-range semantic associations. An Attention mechanism with residual connections is added to ensure focus on key information while preserving the overall sequence characteristics captured. A Conditional Random Field (CRF) is responsible for the final sequence labeling prediction, performing optimal path decoding on the feature sequences extracted by the preceding multi-layer neural networks. Experimental results demonstrate that this approach can effectively improve the accuracy of named entity recognition.
New Near Space Security Handoff Scheme Based on Context Transfer
一种新的基于上下文传递的临近空间安全切换机制
XU Guo-yu,CHEN Xing-yuan,DU Xue-hui,<br>徐国愚,陈性元,杜学绘
计算机科学 , 2013,
Abstract: 针对临近空间中安全切换问题,提出一种新的基于上下文传递的安全切换机制。首先,设计了一种面向临近空间浮空器的切换基站预测算法,以基于多普勒频移技术计算飞行器发生切换的时间与位置,确定切换基站；其次,利用上下文传递机制预先将认证信息发送给切换基站,保证切换过程中通信的可靠性。性能分析与仿真实验表明,该机制通信与计算开销小,强制中断概率低,能够满足临近空间的应用需求。
一种新的基于上下文传递的临近空间安全切换机制
徐国愚？,陈性元？,杜学绘？
计算机科学 , 2013,
Abstract: 针对临近空间中安全切换问题,提出一种新的基于上下文传递的安全切换机制。首先,设计了一种面向临近空间浮空器的切换基站预测算法,以基于多普勒频移技术计算飞行器发生切换的时间与位置,确定切换基站；其次,利用上下文传递机制预先将认证信息发送给切换基站,保证切换过程中通信的可靠性。性能分析与仿真实验表明,该机制通信与计算开销小,强制中断概率低,能够满足临近空间的应用需求。
HPLC法测定伤宁霜中大黄素及大黄酚的含量
何筱毅,刘星星,徐愚聪,黄国英
- , 2006,
Abstract:
ON THE MANAGEMENT MODEL OF KARST-FRACTURE WATER RESOURCE IN LINZI DISTRICT, SHANDONG PROVINCE
山东临淄地区喀斯特—裂隙水资源的管理模型
Zhu Xueyu,Zhu Guorong,Wu Chunyin,Wang Heping,Gao Ming,<br>朱学愚,朱国荣
地理学报 , 1994,
Abstract: A coupled model of finite element method with linear programming was used for the management of karst-fracture water resource in Linzi District of Zibo Municipality, Shandong Province. The mathematical model is given by where H is the groundwater head, Tx and Ty are the components of transmissivity tensor. W is the replenishment in the vertical direction. ST is the storativity, Qij is the pumping rate in well j at time level i. D is the flow domain. T1 is the first kind of boundary, T21 is the impermeable boundary, T22 is the described flux boundary. H0 and f are the described heads and q is the described flux. The model can be decomposed into 2 models and approached by finite element method.The optimal management model is as follows :Objective function:Subject towhere Q(j,1) is the pumping rate in well j at time step l. a (i. j. k-l+ 1) is the influence coefficient,s (i. k) is the constraint of drawdown in well i at time step k and s1 (i, k) is the additional drawdown. a(i. j, k- l + 1) and s1 (i, k) can be computed by finite element method. The optimization model has been solved by simplex method. The results are shown in this article.
Extension Control Model of Function Integration in CIPS
连续生产综合自动化系统功能集成的可拓控制模型
Xu Shunxi,Wang Xingyu,<br>徐顺喜,王行愚
系统工程理论与实践 , 1998,
Abstract: In this paper, we discuss the similarity of all the levels of CIPS. Every level has three elements: the information, the control and the object, which can be considered as the elements of a control system. Based on this, we present an extension control model of function integration in CIPS.
氧和二氧化碳对莱阳梨果肉切片乙烯生物合成的调节作用
刘愚,吴有梅,徐荣江,李振国,顾文卯,高经成
- , 1987,
Abstract: 跃变期的莱阳梨果肉切片保温12h期间,降低空气O_(2)浓度使乙烯生成减少,ACC含量相应增加,解除处理后, 除0%O_(2)处理外都能恢复相应的乙烯生成速率。CO_(2)对乙烯生成有促进和抑制双重作用,处理初期表现出促进,O_(2)浓度低时更显著,随保 温时间延长CO_(2)表现出抑制作用并继续增强。CO_(2)浓度增高,乙烯生成的抑制增强,ACC含量变化与乙烯减少之间没有很好的相应关系, 解除CO_(2)处理后乙烯生成速率不能恢复。图7表1参21
MATHEMATICAL SIMULATION OF FRACTURE-KARST WATER CONTAMINATION IN BOSHAN CITY,SHANDONG PROVINCE
山东博山地下水污染的数学模拟
Zhu Xueyu,Xu Shaohui,Wu Chunyin,Zhou Nianqing,<br>朱学愚,徐绍辉,吴春寅,周念清
环境科学学报 , 1996,
Abstract: Based on analytical results on hydrogeological feature and the situation of groundwater contamination, several mathematic methods were adopted to evaluate fracture-karst water quality and to simulate the distribution of contaminants in the groundwater.A fuzzy mathematical method,was applied to evaluate fracture-karst water quality in Boshan City. Geostatistical methods including Kriging analysis and trend analysis,were employed to simulate contaminants distribution in aquifer.Grey system method was adopted to forecast SO42-concentrations in representative wells. Characteristic finite element solution of adjective-dispersive equation was used for modeling contaminants distribution in groundwater and predicting groundwater contamination in the future The characteristics and applicable condition of each mathematic method are discussed as well.
Relationship of soil fauna and N cycling and its response to N deposition
土壤动物与N素循环及对N沉降的响应
XU Guo Liang,<br>徐国良
生态学报 , 2003,
Abstract: This paper reviews based on available scientific knowledge the importance of soil fauna for N cycling and its response to N deposition. The functioning of terrestrial ecosystems depend highly on soil fauna biodiversity, which have characteristic impacts on ecosystem processes. N is usually a limited nutrient element for plant growth, and is also the quantitatively most important mineral element absorbed by plants from the soil. But the supply of N by turnover in the ecosystem fully depends on biological soil processes. The diversity of soil fauna is large and has important impact on this N turnover. It is suggested that 30 percent of N mineralization is due to the action of soil fauna, and the percentage is even higher under the action of macrofauna. Many soil fauna, such as earthworm, termite and enchytraeid can accelerate N mineralization rate significantly. The diversity of functional groups is important in the research of the effect of soil fauna community on N mineralization, but taxonomic diversity's effects are not significant. It is also recovered that soil fauna can enhance the efficiency of N absorption by plants, however, the mechanism of which is not known yet. N deposition is a serious environment problem globally. It changes soil physical and chemical characteristics, the quality of food, the mutual role of community, and even kill soil life forms directly. As a result, the diversity of soil fauna and its function in the ecosystem is affected by N deposition. The research methods used in studying soil fauna and N turnover, the impact and its mechanism of soil fauna on N turnover, and the responses of soil fauna to N deposition is discussed in this paper. The demands for soil fauna research in the tropic of N turnover and impact N deposition is outlined. .
SURFACE MESH FAIRING BY ADAPTIVE GEOMETRIC DIFFUSION
曲面平滑的自适应几何扩散
Xu Guoliang,<br>徐国良
计算数学 , 2002,
Abstract: In triangulated surface meshes, there are often very noticeable size variances (the vertices are distributed unevenly). The presented noise of such surface meshes is therefore composite of vast frequencies. In this paper, we introduce an adaptor in the diffusion partial differential equation for noise removal of arbitrary triangular manifolds. The proposed approach is simple and is easy to incorporate into any diffusion implementation with significant improvements over evolution results with identity adaptor.
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