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Index-free triangle-based graph local clustering

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Frontiers of Computer Science 2024年第3期18卷 143-153页

作者： Zhe YUAN zhewei wei Fangrui LV Ji-Rong WEN The Country and Area Studies Academy Beijing Foreign Studies UniversityBeijing 100089China Gaoling School of Artificial Intelligence Renmin University of ChinaBeijing 100872China

Motif-based graph local clustering(MGLC)is a popular method for graph mining tasks due to its various ***,the traditional two-phase approach of precomputing motif weights before performing local clustering loses locality and is impractical for large *** some attempts have been made to address the efficiency bottleneck,there is still no applicable algorithm for large scale graphs with billions of *** this paper,we propose a purely local and index-free method called Index-free Triangle-based Graph Local Clustering(TGLC^(*))to solve the MGLC problem w.r.t.a ***^(*)directly estimates the Personalized PageRank(PPR)vector using random walks with the desired triangleweighted distribution and proposes the clustering result using a standard sweep *** demonstrate TGLC^(*)’s scalability through theoretical analysis and its practical benefits through a novel visualization ***^(*)is the first algorithm to solve the MGLC problem without precomputing the motif *** experiments on seven real-world large-scale datasets show that TGLC^(*)is applicable and scalable for large graphs.

关键词： graph local clustering triangle motif index-free sampling method visualization

A survey on large language model based autonomous agents

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Frontiers of Computer Science 2024年第6期18卷 186345-186345页

作者： WANG Lei MA Chen FENG Xueyang ZHANG Zeyu ,YANG Hao ZHANG Jingsen CHEN Zhiyuan TANG Jiakai CHEN Xu LIN Yankai ZHAO Wayne Xin wei zhewei WEN Jirong Gaoling School of Artificial Intelligence Renmin University of China

Autonomous agents have long been a research focus in academic and industry communities. Previous research often focuses on training agents with limited knowledge within isolated environments, which diverges significantly from human learning processes, and makes the agents hard to achieve human-like decisions. Recently, through the acquisition of vast amounts of Web knowledge, large language models (LLMs) have shown potential in human-level intelligence, leading to a surge in research on LLM-based autonomous agents. In this paper, we present a comprehensive survey of these studies, delivering a systematic review of LLM-based autonomous agents from a holistic perspective. We first discuss the construction of LLM-based autonomous agents, proposing a unified framework that encompasses much of previous work. Then, we present a overview of the diverse applications of LLM-based autonomous agents in social science, natural science, and engineering. Finally, we delve into the evaluation strategies commonly used for LLM-based autonomous agents. Based on the previous studies, we also present several challenges and future directions in this field.

关键词： autonomous agent large language model human-level intelligence

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图神经网络理论述评与应用初探

信息通信技术 2021年第3期15卷 21-27,34页

作者：陈明魏哲巍中国人民大学北京100872

近年来,由于图结构数据的强大表现力,用机器学习方法分析图的研究越来越受到重视。图神经网络是一类基于深度学习的处理图结构信息的方法,在众多应用领域展现出了卓越的性能,因此已成为一种广泛应用的图分析方法。文章介绍了图神经网络... 详细信息

近年来,由于图结构数据的强大表现力,用机器学习方法分析图的研究越来越受到重视。图神经网络是一类基于深度学习的处理图结构信息的方法,在众多应用领域展现出了卓越的性能,因此已成为一种广泛应用的图分析方法。文章介绍了图神经网络的理论基础与各种训练技术,并对现有的图形神经网络模型进行了详细的回顾,最后讨论了图学习领域中的一些挑战和对未来工作的展望。

关键词：深度学习图神经网络图分析

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动态有权图上的随机游走概率计算

计算机研究与发展 2024年第8期61卷 1865-1881页

作者：王涵之易璐魏哲巍甘骏豪袁野文继荣杜小勇中国人民大学信息学院北京100872 中国人民大学高瓴人工智能学院北京100872 琶洲实验室(黄埔) 广州510555 墨尔本大学澳大利亚墨尔本VIC3010 北京理工大学计算机学院北京100081 大数据管理与分析方法研究北京市重点实验室(中国人民大学高瓴人工智能学院) 北京100872 数据工程与知识工程教育部重点实验室(中国人民大学) 北京100872

图上的随机游走概率计算是传统图论与现代数据挖掘领域普遍关注的问题之一.现有工作普遍关注静态图上的随机游走概率计算,却鲜少关注与实际应用场景更贴合的权重动态图.针对动态有权图上的随机游走概率计算问题,提出了一种基于硬币翻转... 详细信息

图上的随机游走概率计算是传统图论与现代数据挖掘领域普遍关注的问题之一.现有工作普遍关注静态图上的随机游走概率计算,却鲜少关注与实际应用场景更贴合的权重动态图.针对动态有权图上的随机游走概率计算问题,提出了一种基于硬币翻转采样的随机游走概率计算方法.相比于传统的基于权重采样的随机游走概率计算方法,所提方法可以在保证随机游走概率计算结果无偏的前提下,同时做到近似最优的随机游走概率计算复杂度和最优的采样结构更新复杂度.作为对比,现有方法或具有较大的计算时间复杂度,或依赖于复杂的索引结构而难以在动态图上即时更新.对所提方法做出了详细的理论分析,并在真实图数据集上进行模拟实验,实验结果证实了所提方法的有效性.

关键词：随机游走概率计算动态有权图硬币翻转采样实时更新大规模图

基于荷包缝合腹腔镜NOSES在乙状结肠癌及上段直肠癌治疗中的应用价值

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中华消化外科杂志 2024年第6期23卷 853-858页

作者：魏哲威刘宝忆周皓雷天翔孙开宇宋武中山大学附属第一医院胃肠外科中心广州510080

目的探讨基于荷包缝合腹腔镜经自然腔道取标本手术(NOSES)在乙状结肠癌及上段直肠癌治疗中的应用价值.方法采用回顾性描述性研究方法.收集2022年10月至2023年6月中山大学附属第一医院收治的14例行基于荷包缝合腹腔镜NOSES乙状结肠癌及... 详细信息

目的探讨基于荷包缝合腹腔镜经自然腔道取标本手术(NOSES)在乙状结肠癌及上段直肠癌治疗中的应用价值.方法采用回顾性描述性研究方法.收集2022年10月至2023年6月中山大学附属第一医院收治的14例行基于荷包缝合腹腔镜NOSES乙状结肠癌及上段直肠癌根治术患者的临床病理资料;男8例,女6例;年龄为(56±10)岁.观察指标:(1)手术情况.(2)术后情况.(3)随访情况.正态分布的计量资料以(x)±s表示.计数资料以绝对数表示.结果(1)手术情况.所有患者顺利行基于荷包缝合腹腔镜NOSES乙状结肠癌及上段直肠癌根治术,无中转开放手术.14例患者手术时间为(162±32)min,术中出血量为(22±12)mL.(2)术后情况.14例患者术后首次下床活动时间为(1.6±0.7)d,术后首次肛门排气时间为(2.1±0.6)d,术后首次饮水时间为(2.4±0.6)d,术后首次进食流质食物时间为(3.8±1.0)d,术后住院时间为(6.0±0.9)d.所有患者术后未发生吻合口漏、出血等围手术期并发症.(3)随访情况.14例患者均获得随访,随访时间为(9.7±1.9)个月.14例患者术后无复发、转移和死亡.结论基于荷包缝合腹腔镜NOSES用于治疗乙状结肠癌及上段直肠癌安全、可行.

关键词：结直肠肿瘤乙状结肠上段直肠经自然腔道取标本荷包缝合疗效安全性腹腔镜检查

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低速风洞试验中的热图技术

工程与试验 2009年第3期49卷 51-52,63页

作者：杨越明李满魏哲伟空军航空大学航理系吉林长春130022 空军航空大学飞训基地吉林长春130103

通过热像仪测量平板翼型在低速风洞中附面层转捩点的变化情况,把红外成像技术应用于航空领域。介绍了附面层的产生及特性、层流附面层和紊流附面层的区别和转捩点的概念;用热像仪采集了平板翼型附面层的热图;根据不同迎角和速度下平板... 详细信息

通过热像仪测量平板翼型在低速风洞中附面层转捩点的变化情况,把红外成像技术应用于航空领域。介绍了附面层的产生及特性、层流附面层和紊流附面层的区别和转捩点的概念;用热像仪采集了平板翼型附面层的热图;根据不同迎角和速度下平板翼型表面的温度分布分析转捩点的变化情况。该文对研究附面层表面的阻力、附面层气流的分离和飞机的气动特性具有一定的参考价值和指导意义。

关键词：红外成像附面层转捩点

趋化因子CXCL1通过整合素β1调控胃癌转移的机制研究

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中华普通外科学文献（电子版） 2020年第4期14卷 248-252页

作者：魏哲威张常华何裕隆中山大学附属第一医院胃肠外科中心广州510080 中山大学附属第七医院消化病中心深圳518000

目的探讨过表达趋化因子CXCL1促进胃癌细胞迁移及相关分子机制。方法应用胃癌细胞株(SGC-7901、BGC-823),重组慢病毒方法构建过表达CXCL1细胞株,siRNA敲低胃癌细胞表达整合素β1(integrinβ1)。Western blotting法检测CXCL1、integrinβ... 详细信息

目的探讨过表达趋化因子CXCL1促进胃癌细胞迁移及相关分子机制。方法应用胃癌细胞株(SGC-7901、BGC-823),重组慢病毒方法构建过表达CXCL1细胞株,siRNA敲低胃癌细胞表达整合素β1(integrinβ1)。Western blotting法检测CXCL1、integrinβ1、基质金属蛋白酶(MMP)-2、MMP-9、FAK、SRC和ERK的表达,Transwell实验评估胃癌细胞的迁移能力。结果过表达CXCL1的SGC-7901和BGC-823细胞中integrinβ1表达水平高于对照细胞,siRNA干扰CXCL1表达后,胃癌细胞integrinβ1表达水平下降。外源性CXCL1分别增强SGC-7901和BGC-823细胞迁移能力(2.40±0.44)倍(P=0.002)和(2.08±0.30)倍(P=0.001)。此外,CXCL1还增强FAK、SRC和ERK的磷酸化水平。integrinβ1-siRNA可以阻断CXCL1所引起的SGC-7901和BGC-823细胞迁移能力增强(P<0.05)及FAK、SRC和ERK的磷酸化水平。CXCL1调控SGC-7901和BGC-823细胞的MMP-2、MMP-9表达,而敲低integrinβ1后MMP-2、MMP-9表达随之下调。MMP抑制剂GM6001抑制7901-CXCL1和823-CXCL1细胞的迁移能力(P<0.05)。结论CXCL1通过integrinβ1激活FAK-SRC-ERK通路和调控MMP-2、MMP-9的表达,最终调控胃癌细胞迁移。

关键词：胃癌趋化因子 CXCL1 整合素β1

Synthesis of uniform two-dimensional MoS_(2) films via thermal evaporation

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Nano Research 2024年第4期17卷 3217-3223页

作者： Xue-wei Lu zhewei Li Chen-Kai Yang weijia Mou Liying Jiao Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

Two-dimensional(2D)molybdenum disulfide(MoS_(2))holds great potential for various applications such as electronic devices,catalysis,lubrication,anti-corrosion and so *** evaporation is a versatile thin film deposition technique,however,the conventional thermal evaporation techniques face challenges in producing uniform thin films of MoS_(2) due to its high melting temperature of 1375℃.As a result,only thick and rough MoS_(2) films can be obtained using these *** address this issue,we have designed a vacuum thermal evaporation system specifically for large-scale preparation of MoS_(2) thin *** using K2MoS4 as the precursor,we achieved reliable deposition of uniform polycrystalline MoS_(2) thin films with a size of 50 mm×50 mm and controllable thickness ranging from 0.8 to 2.4 *** approach also allows for patterned deposition of MoS_(2) using shadow masks and sequential deposition of MoS_(2) and tungsten disulfide(WS_(2)),similar to conventional thermal evaporation ***,we have demonstrated the potential applications of the obtained MoS_(2) thin films in field effect transistors(FETs),memristors and electrocatalysts for hydrogen evolution reaction(HER).

关键词： thermal evaporation molybdenum disulfide two-dimensional memristors hydrogen evolution reaction

Preoperative virtual reduction method for pelvic fractures based on statistical shape models and partial surface data

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Biomimetic Intelligence & Robotics 2023年第4期3卷 67-74页

作者： wei Kou Yaoyao He Xiao Cheng zhewei Wang Yuan Yang Shaolong Kuang Department of Mechanical and Electrical Engineering Soochow UniversitySuzhou 215021China Applied Technology College Soochow UniversitySuzhou 215325China Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry Guangxi Medical UniversityNanning 530021China College of Health Science and Environment Engineering Shenzhen Technology UniversityShenzhen 518118China

Virtual reduction is crucial for successful and accurate reduction of pelvic *** methods have been proposed in this ***,not all of them are applicable to every pelvic *** these methods,the efficiency and accuracy of the method based on statistical shape models in clinical applications require further *** study proposes a virtual reduction method for pelvic fractures that uses statistical shape models and partial surface data of a broken *** fracture and clinical case experiments were conducted to validate the accuracy and effectiveness of the proposed *** simulated fracture experiments yielded an average error of 1.57±0.39 mm and a maximum error of 12.82±3.54 *** virtual reduction procedure takes approximately 40 *** on three clinical case experiments,the proposed method achieves an acceptable level of accuracy compared with manual reduction by a *** proposed method offers the advantages of shorter virtual reduction times and satisfactory reduction *** the future,it will be integrated into the preoperative planning system for pelvic fracture reduction,thereby improving patient outcomes.

关键词： Preoperative planning Virtual reduction Statistical shape model Pelvic fractures