检索结果-内蒙古大学图书馆

Science Letters:Model for cascading failures in congested Internet

Journal of Zhejiang University-Science A(Applied Physics & engineering) 2008年第10期9卷 1331-1335页

作者： Jian WANG Yan-heng LIU Jian-qi ZHU Yu JIAO Key Lab of Symbolic Computation and Knowledge Engineering of Ministry of Education College of Computer Science and Technology Jilin University Changchun 130012 China

Cascading failures often occur in congested networks such as the Internet. A cascading failure can be described as a three-phase process： generation, diffusion, and dissipation of the congestion. In this account, we present a function that represents the extent of congestion on a given node. This approach is different from existing fimctions based on betweenness centrality. By introducing the concept of ＇delay time＇, we designate an intergradation between permanent removal and nonremoval. We also construct an evaluation fimction of network efficiency, based on congestion, which measures the damage caused by cascading failures. Finally, we investigate the effects of network structure and size, delay time, processing ability and packet generation speed on congestion propagation. Also, we uncover the relationship between the cascade dynamics and some properties of the network such as structure and size.

关键词： Complex network Cascading failures Congestion effects Propagation model

来源：评论

学校读者我要写书评

暂无评论

Meta-GPS++: Enhancing Graph Meta-Learning with Contrastive Learning and Self-Training

引用

ACM Transactions on knowledge Discovery from Data 2024年第9期18卷 1-30页

作者： Liu, Yonghao Li, Mengyu Li, Ximing Huang, Lan Giunchiglia, Fausto Liang, Yanchun Feng, Xiaoyue Guan, Renchu Key Laboratory of Symbolic Computation and Knowledge Engineering of the Ministry of Education College of Computer Science and Technology Jilin University Changchun China University of Trento Trento Italy Zhuhai Lab. of the Key Lab. of Symbolic Computation and Knowledge Eng. of the Ministry of Education Zhuhai College of Science and Technology Zhuhai China

Node classification is an essential problem in graph learning. However, many models typically obtain unsatisfactory performance when applied to few-shot scenarios. Some studies have attempted to combine meta-learning with graph neural networks to solve few-shot node classification on graphs. Despite their promising performance, some limitations remain. First, they employ the node encoding mechanism of homophilic graphs to learn node embeddings, even in heterophilic graphs. Second, existing models based on meta-learning ignore the interference of randomness in the learning process. Third, they are trained using only limited lab.led nodes within the specific task, without explicitly utilizing numerous unlab.led nodes. Finally, they treat almost all sampled tasks equally without customizing them for their uniqueness. To address these issues, we propose a novel framework for few-shot node classification called Meta-GPS. Specifically, we first adopt an efficient method to learn discriminative node representations on homophilic and heterophilic graphs. Then, we leverage a prototype-based approach to initialize parameters and contrastive learning for regularizing the distribution of node embeddings. Moreover, we apply self-Training to extract valuable information from unlab.led nodes. Additionally, we adopt S (scaling and shifting) transformation to learn transferable knowledge from diverse tasks. The results on real-world datasets show the superiority of Meta-GPS. Our code is availab.e here. © 2024 Copyright held by the owner/author(s).

关键词： Contrastive Learning

来源：评论

学校读者我要写书评

暂无评论

Research and analysis of psychological data based on machine learning methods

引用

International Journal of Wireless and Mobile Computing 2022年第1期22卷 1-8页

作者： Chen, Guangshun Lv, Wei Ma, Junwei Liang, Yanchun Zhuhai Lab. of Key Lab. of Symbol Computation and Knowledge Engineering of Ministry of Education Zhuhai College of Jilin University Jilin Zhuhai China Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education College of Computer Science and Technology Jilin University Jilin Changchun China

The integration of psychology and computer science has become the mainstream contemporary research method on psychological data. Weibo, China's largest open platform for communication and information sharing between users, has many emotional contents hidden in its data. According to the current trend, the Weibo data are segmented by machine learning to obtain a psychological portrait of Weibo users. This design uses Long and Short-Term Memory (LSTM) networks and Convolutional Neural Networks (CNNs) to perform sentiment classification on Weibo data. The classification results are analysed using word frequency analysis and the Latent Dirichlet Allocation (LDA) model to obtain portraits of Weibo users' sentiment and an analysis of the results. The results are displayed in the form of word clouds. According to the clustering results of the word clouds, the main factors affecting different polar emotions can be analysed. © 2022 Inderscience Enterprises Ltd.. All rights reserved.

关键词： Statistics

来源：评论

学校读者我要写书评

暂无评论

Extracting a justification for OWL ontologies by critical axioms

引用

Frontiers of Computer Science 2020年第4期14卷 55-64页

作者： Yuxin YE Xianji CUI Dantong OUYANG College of Computer Science and Technology Jilin UniversityChangchun130012China Key Lab of Symbolic Computation and Knowledge Engineering(Jilin University) Ministry of EducationChangchun130012China College of Information and Communication Engineering Dalian Minzu UniversityDalian116600China

Extracting justifications for web ontology language(OWL)ontologies is an important mission in ontology *** this paper,we focus on black-box techniques which are based on ontology *** creating a recursive expansion procedure,all elements which are called critical axioms in the justification are explored one by *** this detection procedure,an axiom selection function is used to avoid testing irrelevant *** addition,an incremental reasoning procedure has been proposed in order to substitute series of standard reasoning tests *** is implemented by employing a pseudo model to detect“obvious”satisfiability *** experimental results show that our proposed strategy for extracting justifications for OWL ontologies by adopting incremental expansion is superior to traditional Black-box methods in terms of efficiency and performance.

关键词： description logics automated reasoning ontology engineering justification

来源：评论

学校读者我要写书评

暂无评论

The Discrete Approximation Problem for a Special Case of Hermite-Type Polynomial Interpolation

引用

Journal of Systems Science & Complexity 2022年第5期35卷 2004-2015页

作者： GONG Yihe JIANG Xue ZHANG Shugong College of Science Northeast Electric Power UniversityJilin 132000China School of Mathematics and Systematic Sciences Shenyang Normal UniversityShenyang 110034China Institute of Mathematics Key Lab.of Symbolic Computation and Knowledge Engineering(Ministry of Education)Jilin UniversityChangchun 130012China

Every univariate Hermite interpolation problem can be written as a pointwise limit of Lagrange ***,this property is not preserved for the multivariate *** this paper,the authors first generalize the result of *** an application,the authors consider the discrete approximation problem for a special case when the interpolation condition contains all partial derivatives of order less than n and one nth order differential *** addition,for the case of n≥3,the authors use the concept of Cartesian tensors to give a sufficient condition to find a sequence of discrete points,such that the Lagrange interpolation problems at these points converge to the given Hermite-type interpolant.

关键词： Discrete approximation problem Hermite interpolation Lagrange interpolation

来源：评论

学校读者我要写书评

暂无评论

Predicting user influence based on improved linear threshold model in social networks

引用

Journal of computational Information Systems 2014年第14期10卷 6151-6160页

作者： Tian, Zhongsheng Wang, Ying Zhao, Qiuyue Zuo, Wanli College of Software Jilin University Changchun China College of Computer Science and Technology Jilin University Changchun China Key Lab. of Symbolic Computation and Knowledge Engineering Attached to the Ministry of Education Changchun China

With the scale of social networks growing rapidly, the amount of user participating in it increases at astonishing speed. Predicting user influence in social networks is an interesting and useful research direction. There are lots of works on this area, mainly covering the following aspects: Maximize Influence, Influence Diffusion, Predicting Influential Users and Predicting social influence. The common issue of above aspects is that they can't calculate the precise user influence. In this work, we propose a novel method to give each user influence a precise value in social networks. The proposed method is based on Improved Linear Threshold Model (ILTM). To build ILTM, we take a series of measures to overcome the deficiencies brought by Linear Threshold Model, such as assigning random threshold to node, cold start. So we adopt user similarity instead of random threshold and utilize cluster algorithm and link analysis algorithm to surmount cold start. © 2014 by Binary Information Press

关键词： Forecasting

来源：评论

学校读者我要写书评

暂无评论

Revisit the logical difference of description logic terminologies

引用

Journal of Convergence Information Technology 2011年第4期6卷 240-245页

作者： Feng, Shasha Ouyang, Dantong Liu, Jie College of Computer Science and Technology Jilin University Key Lab of Symbolic Computation and Knowledge Engineering of Ministry of Education Changchun China

The logical difference is important to ontology engineers in capturing and understanding the difference between different versions of given ontology. For acyclic EL terminologies, in which the well applied medical ontology SNOMED CT is represented, there are two methods proposed in computing the logical difference between terminologies: direct computation method and uniform interpolant method. We argue that the later method outperforms the former one in showing the dependency between entailments in the logical difference through the introduction of concept difference. The resulting logical difference conveys more information to ontology engineers than direct computation method.

关键词： Ontology

来源：评论

学校读者我要写书评

暂无评论

Model for cascading failures in congested Internet

引用

Journal of Zhejiang University-Science A(Applied Physics & engineering) 2008年第10期9卷 1331-1335页

Cascading failures often occur in congested networks such as the Internet. A cascading failure can be described as a three-phase process: generation, diffusion, and dissipation of the congestion. In this account, we present a function that represents the extent of congestion on a given node. This approach is different from existing functions based on betweenness centrality. By introducing the concept of ''delay time'', we designate an intergradation between permanent removal and nouremoval. We also construct an evaluation function of network efficiency, based on congestion, which measures the damage caused by cascading failures. Finally, we investigate the effects of network structure and size, delay time, processing ability and packet generation speed on congestion propagation. Also, we uncover the relationship between the cascade dynamics and some properties of the network such as structure and size.

关键词： Complex network Cascading failures Congestion effects Propagation model

来源：评论

学校读者我要写书评

暂无评论

Discover the Binding Domain of Transmembrane Proteins Based on Structural Universality

Discover the Binding Domain of Transmembrane Proteins Based ...

引用

2021 IEEE International Conference on Bioinformatics and Biomedicine, BIBM 2021

作者： Bao, Yihang He, Fei Wang, Weixi Wang, Han Dong, Minglong Northeast Normal University Changchun School of Information Science and Technology China NE Norm. Univ. Key Lab. of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun School of Information Science and Technology China Nanyang Technological University Singapore School of Biological Sciences Singapore

ISBN: (纸本)9781665401265

Transmembrane proteins (TMPs) serve as drug targets for more than half of the drugs currently availab.e in the market. However, it had not been clearly explained how they realize their drug effects through multiple complex molecules bindings actions. Research into TMPs bindings and corresponding structural basis will provide key information for drug research and new drug development. In this study, we defined the binding domain of TMPs according to the binding region investigation of multiple conjugate types. A 3D deep learning model was architected to discover the structural universality inside those domains. The experimental results proved such binding domains existing on the surface of TMPs, and they are structural specific distinguishing to the surface regions without any binding activities. This work provides a new theoretical basis for TMPs binding research and can greatly boost the development of the drug industry. © 2021 IEEE.

关键词： Proteins

来源：评论

学校读者我要写书评

暂无评论

Geometrical Characterizations of Non-Radiating Sources at Polyhedral and Conical Corners with Applications

引用

Communications in Mathematical Research 2023年第4期39卷 523-538页

作者： Huaian Diao Yueran Geng Hongyu Liu Qinghua Yu School of Mathematics and Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin UniversityChangchunJilin 130012P.R.China. Department of Mathematics City University of Hong KongKowloonHong Kong SARP.R.China. The School Attached to Dalian Maritime University Dalian 116000P.R.China.

Considering the acoustic source scattering problems,when the sour-ce is non-radiating/invisible,we investigate the geometrical characterization for the underlying sources at polyhedral and conical *** is revealed that the non-radiating source with Holder continuous regularity must vanish at the *** this kind of geometrical characterization of non-radiating sources,we establish local and global unique determination for a source with the polyhedral or corona shape support by a single far field *** by a single far field measurement constitutes of a long standing problem in inverse scattering problems.

关键词： Non-radiating sources corner singularity vanishing inverse scattering sin-gle far-field measurement

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：