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Improvement of Stochastic Competitive Learning for Social Network

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Computers, Materials & Continua 2020年第5期63卷 755-768页

作者： Wenzheng Li yijun gu School of Information Technology and Cyber Security People’s Public Security University of ChinaBeijing100038China

As an unsupervised learning method,stochastic competitive learning is commonly used for community detection in social network *** with the traditional community detection algorithms,it has the advantage of realizing the time-series community detection by simulating the community formation *** order to improve the accuracy and solve the problem that several parameters in stochastic competitive learning need to be pre-set,the author improves the algorithms and realizes improved stochastic competitive learning by particle position initialization,parameter optimization and particle domination ability *** experiment result shows that each improved method improves the accuracy of the algorithm,and the F1 score of the improved algorithm is 9.07%higher than that of original algorithm.

关键词： Stochastic competitive learning particle swarm optimization algorithm improvement

Heterophilic Graph Neural Network Based on Spatial and Frequency Domain Adaptive Embedding Mechanism

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1701-1731页

作者： Lanze Zhang yijun gu Jingjie Peng College of Information and Cyber Security People’s Public Security University of ChinaBeijing100038China

Graph Neural Networks(GNNs)play a significant role in tasks related to homophilic *** GNNs,based on the assumption of homophily,employ low-pass filters for neighboring nodes to achieve information aggregation and ***,in heterophilic graphs,nodes from different categories often establish connections,while nodes of the same category are located further apart in the graph *** characteristic poses challenges to traditional GNNs,leading to issues of“distant node modeling deficiency”and“failure of the homophily assumption”.In response,this paper introduces the Spatial-Frequency domain Adaptive Heterophilic Graph Neural Networks(SFA-HGNN),which integrates adaptive embedding mechanisms for both spatial and frequency domains to address the aforementioned ***,for the first problem,we propose the“Distant Spatial Embedding Module”,aiming to select and aggregate distant nodes through high-order randomwalk transition probabilities to enhance modeling *** the second issue,we design the“Proximal Frequency Domain Embedding Module”,constructing adaptive filters to separate high and low-frequency signals of nodes,and introduce frequency-domain guided attention mechanisms to fuse the relevant information,thereby reducing the noise introduced by the failure of the homophily *** deploy the SFA-HGNN on six publicly available heterophilic networks,achieving state-of-the-art results in four of ***,we elaborate on the hyperparameter selection mechanism and validate the performance of each module through experimentation,demonstrating a positive correlation between“node structural similarity”,“node attribute vector similarity”,and“node homophily”in heterophilic networks.

关键词： Heterophilic graph graph neural network graph representation learning failure of the homophily assumption

Cooperative Multi-Agent Reinforcement Learning with Constraint-Reduced DCOP

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Journal of Beijing Institute of Technology 2017年第4期26卷 525-533页

作者： Yi Xie Zhongyi Liu Zhao Liu yijun gu School of Information Technology and Cybersecurity People's Public Security University of China Beijing 100038 China School of Management People's Public Security University of China Beijing 100038 China School of Postgraduates People's Public Security University of China Beijing 100038 China

Cooperative multi-agent reinforcement learning（ MARL） is an important topic in the field of artificial intelligence,in which distributed constraint optimization（ DCOP） algorithms have been widely used to coordinate the actions of multiple agents. However,dense communication among agents affects the practicability of DCOP algorithms. In this paper,we propose a novel DCOP algorithm dealing with the previous DCOP algorithms＇ communication problem by reducing *** contributions of this paper are primarily threefold：（1） It is proved that removing constraints can effectively reduce the communication burden of DCOP algorithms.（2） An criterion is provided to identify insignificant constraints whose elimination doesn＇t have a great impact on the performance of the whole system.（3） A constraint-reduced DCOP algorithm is proposed by adopting a variant of spectral clustering algorithm to detect and eliminate the insignificant constraints. Our algorithm reduces the communication burdern of the benchmark DCOP algorithm while keeping its overall performance unaffected. The performance of constraint-reduced DCOP algorithm is evaluated on four configurations of cooperative sensor networks. The effectiveness of communication reduction is also verified by comparisons between the constraint-reduced DCOP and the benchmark DCOP.

关键词： reinforcement learning cooperative multi-agent system distributed constraint optimization (DCOP) constraint-reduced DCOP

Small Molecule X-ray Diffraction Data Acquisition in BL17B of NCPSS/SSRF

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Small Molecule X-ray Diffraction Data Acquisition in BL17B o...

The advanced platform of protein crystallography of National Facility of Protein Science at Shanghai Synchrotron Radiation Facility

第五届中国结构生物学学术讨论会

作者： yijun gu National Center for Protein Science Shanghai Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai Science Research Center Chinese Academy of Sciences

Introduction BL17 B is one of the three newly built protein crystallographic endstations located in Shanghai Synchrotron Radiation Facility（SSRF）. The beamline endstation can carry out SAD, MAD studies by S, Se, Pt, Hg anomalous dispersion for macromolecular structural solution. High automation of the beamline endstation is one of its advantages. In addition to biological macromolecules, the diffraction of small molecules is also particularly suitable to BL17 B for data acquisition because the wavelength of the beam could be tuned at large range（5.0-22Kev）. Although BL17 B has been operational for just one year, more than 300 hundred datasets have been collected and dozens of significant structures have already been achieved. Section 1 BL17 B, high-throughput crystal structure beamline endstation, is equipped with a MD2 diffractometer, a Rayonix MX300 detector, and a CATS sample changer. The major specifications of BL17 B are summarized in Table *** 2 A series of significant structures were solved using the data acquired by BL17 B since it was open for user service to small molecule research groups nationwide in last November. The size of the small molecule crystals could be as small as 10μm in dimension, and still useful diffraction data could be obtained and the structure could be solved. The following figure shows some examples of small molecule structures whose data were acquired in BL17 B.

关键词： BL17B Small molecules Crystallography X-ray diffraction

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The advanced platform of protein crystallography of National...

第四届中国结构生物学学术讨论会

作者： yijun gu Rongguang Zhang Shanghai Institute of Biochemistry and Cell Biology Chinese Academy of Sciences

An advanced platform of highly efficient protein crystallography affiliated with National Facility of Protein Science is being developed at Shanghai Synchrotron Radiation Facility. The platform was designed to have the capabilities of, namely, high precision data collection, intellectual data processing, automatic structural determination and model building, and fast convergence of structural refinement. Five synchrotron beamlines and six endstations were proposed, three of which are dedicated to protein crystallography, i.e., high throughput crystallography beamline BL17B1, microcrystallographic beamline BL18U1, and protein complex beamline BL19U1. The three crystallographic beamlines, scheduled to be in service by the end of 2013, will confer us the capability to determine protein structures at large scale, wide range, and high throughput mode. The beamline BL17B1 uses bending magnet as the light source, is designed especially to be capable of high throughput and automatic data collection with remote access. It is targeted specially at high volume structural genomics and fast structural determination in drug discovery projects;the beamline BL18U1 with undulator as the light source has the micrometer level of beam spot and high intensity, having the capability of data collection of minuscule crystals with very weak diffraction;the undulator beamline BL19U1 is targeted at data collection of crystals of large unit cell over 1000 A. All the three beamlines are equipped with advanced fast readout detectors and automatic sample changers. The three crystallographic beamlines meet the challenges modern protein crystallographers are faced with. To fully utilize the capacity of the crystallographic beamlines, systematic software tools for automation of data collection, process, structural determination, modeling building and refinement are under development and will be implemented into the original crystallographic packages, such as HKL3000 and OASIS. The software developme

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基于多模态异质图的社交媒体谣言检测模型

数据分析与知识发现 2023年第11期7卷 68-78页

作者：强子珊顾益军中国人民公安大学信息网络安全学院北京100038

【目的】验证谣言不同模态之间存在关联性,以提高谣言检测准确率,进而提出一种基于多模态异质图的社交媒体谣言检测模型。【方法】以社交平台上多模态的帖子为研究对象,首先通过预处理提取文本、图片两种模态信息及用户属性信息的特征表... 详细信息

【目的】验证谣言不同模态之间存在关联性,以提高谣言检测准确率,进而提出一种基于多模态异质图的社交媒体谣言检测模型。【方法】以社交平台上多模态的帖子为研究对象,首先通过预处理提取文本、图片两种模态信息及用户属性信息的特征表示,按照文本、图片、用户三者间的关联关系构建异质图,然后按照指定的元路径提取文本类型节点的嵌入表示,最后将其输入分类器中,判断其是否是谣言。【结果】在公开的数据集上进行实验,结果表明,所提模型在两个数据集上的准确率分别达到91.3%和93.8%,其他评价指标也高于基线模型。【局限】由于共享多模态谣言的三类节点会使所构建的异质图存在较大的稀疏性,所提模型更适用于小型的话题社区。【结论】谣言的不同模态之间存在关联性,所提模型利用该特征在多模态谣言检测中表现出良好的效果。

关键词：谣言检测节点嵌入多模态异质图注意力机制

现实主义的多重镜像--重提“功能现实主义”的历史线索与文学史意义

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南京社会科学 2021年第11期 131-140页

作者：顾奕俊浙江大学传媒与国际文化学院杭州310058

20世纪三四十年代,布莱希特在现实主义与表现主义的论争中提出了"功能现实主义"这一概念,且通过一系列理论阐发与戏剧实践将其明晰化。之后,罗杰·加洛蒂、维尔纳·密滕茨威等人的文章著述在接续发展"功能现实主义"的同时,进一步彰显现... 详细信息

20世纪三四十年代,布莱希特在现实主义与表现主义的论争中提出了"功能现实主义"这一概念,且通过一系列理论阐发与戏剧实践将其明晰化。之后,罗杰·加洛蒂、维尔纳·密滕茨威等人的文章著述在接续发展"功能现实主义"的同时,进一步彰显现实主义丰富而深刻的本体能力。而考察20世纪中国文学史的演变轨迹,则可注意到相应阶段特定作家、文艺理论家的观念论述与布莱希特所抛出的"功能现实主义"之间具有值得辨析的相似性。梳理"功能现实主义"的历史线索与文学史意义,显然是审视20世纪中国现实主义文学创作与理论批评的一个重要的路径视角,并由此展望中国现实主义文艺道路的前景。

关键词：布莱希特功能现实主义现实主义 20世纪中国文学史

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王苏辛中短篇小说片论

扬子江（评论） 2019年第1期 96-101页

作者：顾奕俊南京师范大学文学院

一、从“同时代人”出发:“冒犯者”的“特殊性”读完王苏辛相关小说后的很长一段时间里,事实上我多少有些“不知从何谈起”。之所以如此,源于缺乏自认为“唯应如此”的门径进入《白夜照相馆》《战国风物》《袁万岁》《马灵芝》《我不... 详细信息

一、从“同时代人”出发:“冒犯者”的“特殊性”读完王苏辛相关小说后的很长一段时间里,事实上我多少有些“不知从何谈起”。之所以如此,源于缺乏自认为“唯应如此”的门径进入《白夜照相馆》《战国风物》《袁万岁》《马灵芝》《我不在那儿》《犹豫的时候最接近道德》这些具体的文本。当然,我也时常注意到当下部分文学批评从业者在陷入“不知从何谈起”处境时惯用的“技法”——借助若干生僻冷门的舶来品理论“挥毫”出一篇洋洋洒洒的“套路批评”,但若依循为之,则问题随之而来:假如相同的理论可以毫无违和感地套用于不同年龄层次、不同形式风格的作家作品,这并不一定意味着理论的“强制阐释”,倒更可能暴露出批评主体在批评范式选择与实践上的力所不逮。尤其是当本文所要讨论的是跟我同龄的王苏辛时,我更加愿意将有关“同时代人”的讨论引申向趋于“狭隘”的“特殊性”,而绝非形同“套路“的“普遍性”。

关键词：中短篇小说文学批评作家作品形式风格范式选择批评主体照相馆舶来品

知识分子书写的“朦胧形态”与“性”的幻术——从《绿化树》到《男人的一半是女人》

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小说评论 2022年第3期 91-98页

作者：顾奕俊浙江大学

一、知识分子书写的“朦胧形态”是如何出现的?不妨先从《男人的一半是女人》说起。张贤亮的《男人的一半是女人》发表于《收获》1985年第5期。之后不久,刚刚卸任人民文学出版社社长、总编辑职务的韦君宜,因“我不希望由于这么一部作品... 详细信息

一、知识分子书写的“朦胧形态”是如何出现的?不妨先从《男人的一半是女人》说起。张贤亮的《男人的一半是女人》发表于《收获》1985年第5期。之后不久,刚刚卸任人民文学出版社社长、总编辑职务的韦君宜,因“我不希望由于这么一部作品(况且这个作者也写过一些好作品),又将连累整个‘文艺界’都跟着没头没脑地挨骂,如过去所常见者,故预先写几句”,于1985年12月28日的《文汇报》刊登《一本畅销书引起的思考》一文.

关键词：《男人的一半是女人》《收获》张贤亮《绿化树》韦君宜《文汇报》畅销书朦胧