检索结果-南通市图书馆

Unmasking Social Robots’Camouflage:A GNN-Random Forest Framework for Enhanced Detection

Computers, Materials & Continua 2025年第1期82卷 467-483页

作者： Weijian Fan Chunhua Wang Xiao Han Chichen Lin School of Data Science and Intelligent media Communication University of ChinaBeijing100024China School of Computer and Cyber Sciences Communication University of ChinaBeijing100024China institute of Communication Studies Communication University of ChinaBeijing100024China State Key Laboratory of media Convergence and Communication Communication University of ChinaBeijing100024China

The proliferation of robot accounts on social media platforms has posed a significant negative impact,necessitating robust measures to counter network anomalies and safeguard content *** robot detection has emerged as a pivotal yet intricate task,aimed at mitigating the dissemination of misleading *** graphbased approaches have attained remarkable performance in this realm,they grapple with a fundamental limitation:the homogeneity assumption in graph convolution allows social robots to stealthily evade detection by mingling with genuine human *** unravel this challenge and thwart the camouflage tactics,this work proposed an innovative social robot detection framework based on enhanced HOmogeneity and Random Forest(HORFBot).At the core of HORFBot lies a homogeneous graph enhancement strategy,intricately woven with edge-removal techniques,tometiculously dissect the graph intomultiple revealing ***,leveraging the power of contrastive learning,the proposed methodology meticulously trains multiple graph convolutional networks,each honed to discern nuances within these tailored *** culminating stage involves the fusion of these feature-rich base classifiers,harmoniously aggregating their insights to produce a comprehensive detection *** experiments on three social robot detection datasets have shown that this method effectively improves the accuracy of social robot detection and outperforms comparative methods.

关键词： Social robot detection graph neural networks random forest homophily heterophily

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Localizing base stations with measured data:a concatenated image-based deep learning approach

引用

Science China(Information Sciences) 2025年

作者： Yang CHEN Ziyuan LIU Feng JIANG Hong SHEN Wei XU Mengyu LI Ritao CHENG National Mobile communications Research Laboratory Southeast University China Mobile Group Design institute Co. Ltd.

Localization has become an indispensable function of modern cellular communication systems[1]. In a cloud radio access network （C-RAN）, the remote radio head （RRH） is the actual signal transmitter, whose location ...

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Patch-based variational image approximation

引用

Science China(Information Sciences) 2017年第3期60卷 78-87页

作者： Hao XIE Ruofeng TONG Artificial Intelligence institute Zhejiang University College of New media Zhejiang University of Media and Communications

Vector graphic gives us a new solution to the representation of raster images. Among many types of vectorized representations, the most popular is mesh representation, which inherits the benefits of vector graphics. Inspired by mesh, we propose a novel patch-based representation for raster images, in which pixels are partitioned into regions, and pixels belonging to the same region are converted into a 3D point cloud and approximated by a 3D planar patch with proper boundaries in a variational way. The resulting patches are then encoded via a half-edge structure for storage. The key point is that the vertices of boundaries are not located on the very positions of sample points, i.e. converted pixels, but dependent on the optimal position of the patch,which theoretically reduces the fitting errors. Experiments show that our algorithm produces better results.

关键词： image approximation vector graphics image representation plane optimization boundary extrac tion

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

(2+1)-Dimensional Spatial Localized Modes in Cubic-Quintic Nonlinear media with the PT-Symmetric Potentials

引用

communications in Theoretical Physics 2015年第7期64卷 71-80页

作者：陈翼翔徐周翔蒋云峰史进徐方迁 School of Electronics Information Zhejiang University of Media and Communications institute of Digital media and Communication Technology Zhejiang University of Media and Communications Department of Physics Institute of Optics Zhejiang University Network Center Zhejiang Police College

We obtain exact spatial localized mode solutions of a(2+1)-dimensional nonlinear Schr¨odinger equation with constant diffraction and cubic-quintic nonlinearity in PT-symmetric potential, and study the linear stability of these solutions. Based on these results, we further derive exact spatial localized mode solutions in a cubic-quintic medium with harmonic and PT-symmetric potentials. Moreover, the dynamical behaviors of spatial localized modes in the exponential diffraction decreasing waveguide and the periodic distributed amplification system are investigated.

关键词： 2D spatial localized modes PT-symmetric potential

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Spatial Solitons in 2D Graded-Index Waveguides with Different Distributed Transverse Diffractions

引用

communications in Theoretical Physics 2014年第2期61卷 214-220页

作者：陈翼翔 School of Electronics Information Zhejiang University of Media and Communications

We discuss the nonlinear Schr6dinger equation with variable coefficients in 21） graded-index waveguides with different distributed transverse diffractions and obtain exact bright and dark soliton solutions. Based on these solutions, we mainly investigate the dynamical behaviors of solitons in three different diffraction decreasing waveguides with the hyperbolic, Gaussian and Logarithmic profiles. Results indicate that for the same parameters, the amplitude of bright solitons in the Logarithmic profile and the amplitude of dark solitons in the Gaussian profile are biggest respectively, and the amplitude in the hyperbolic profile is smallest, while the width of solitons has the opposite case.

关键词： nonlinear Schr6dinger equation bright solitons dark solitons diffraction decreasing waveguides

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Network-adaptive HD MPEG-2 video streaming with cross-layered channel monitoring in WLAN

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第5期7卷 885-893页

作者： PARK Sanghoon YOON Hayoung KIM Jongwon Networked media Laboratory Department of Information and Communications GwangJu Institute of Science and Technology Gwangju 500-712 Korea

In this paper, we propose a practical design and implementation of network-adaptive high definition (HD) MPEG-2 video streaming combined with cross-layered channel monitoring (CLM) over the IEEE 802.11a wireless local area network (WLAN). For wireless channel monitoring, we adopt a cross-layered approach, where an access point (AP) periodically measures lower layers such as medium access control (MAC) and physical (PHY) transmission information (e.g., MAC layer loss rate) and then sends the monitored information to the streaming server application. The adaptive streaming server with the CLM scheme reacts more quickly and efficiently to the fluctuating wireless channel than the end-to-end application-layer monitoring (E2EM) scheme. The streaming server dynamically performs priority-based frame dropping to adjust the sending rate according to the measured wireless channel condition. For this purpose, the proposed streaming system nicely provides frame-based prioritized packetization by using a real-time stream parsing module. Various evaluation results over an IEEE 802.11a WLAN testbed are provided to verify the intended Quality of Service (QoS) adaptation capability. Experimental results showed that the proposed system can mitigate the quality degradation of video streaming due to the fluctuations of time-varying channel.

关键词： Wireless video, Adaptive video streaming, Cross-layered design, Prioritized packetization, MPEG-2

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamics of optical rogue waves in inhomogeneous nonlinear waveguides

引用

Chinese Physics B 2013年第5期22卷 330-334页

作者：张解放金美贞何纪达楼吉辉戴朝卿 Zhejiang University of media and communications institute of Nonlinear Physics Zhejiang Normal University School of Sciences Zhejiang Agriculture and Forestry University

We propose a unified theory to construct exact rogue wave solutions of the （2＋1）-dimensional nonlinear Schr6dinger equation with varying coefficients. And then the dynamics of the first- and the second-order optical rogues are investigated. Finally, the controllability of the optical rogue propagating in inhomogeneous nonlinear waveguides is discussed. By properly choosing the distributed coefficients, we demonstrate analytically that rogue waves can be restrained or even be annihilated, or emerge periodically and sustain forever. We also figure out the center-of-mass motion of the rogue waves.

关键词： rogue wave (2+ 1)-dimensional nonlinear Schrodinger equation inhomogeneous nonlinear waveg-uides

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A parallel and scalable digital architecture for training support vector machines

引用

Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第8期11卷 620-628页

作者： Kui-kang CAO Hai-bin SHEN Hua-feng CHEN institute of VLSI Design Zhejiang University Hangzhou 310027 China Zhejiang University of Media and Communications Hangzhou 310027 China

To facilitate the application of support vector machines (SVMs) in embedded systems,we propose and test a parallel and scalable digital architecture based on the sequential minimal optimization (SMO) algorithm for training *** taking advantage of the mature and popular SMO algorithm,the numerical instability issues that may exist in traditional numerical algorithms are *** error cache updating task,which dominates the computation time of the algorithm,is mapped into multiple processing units working in *** results show that using the proposed architecture,SVM training problems can be solved effectively with inexpensive fixed-point arithmetic and good scalability can be *** architecture overcomes the drawbacks of the previously proposed SVM hardware that lacks the necessary flexibility for embedded applications,and thus is more suitable for embedded use,where scalability is an important concern.

关键词： Support vector machine (SVM) Sequential minimal optimization (SMO) Field-programmable gate array (FPGA) Scalable architecture

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Existence and iteration of monotone positive solutions for a third-order two-point boundary value problem

引用

Applied Mathematics(A Journal of Chinese Universities) 2008年第4期23卷 413-419页

作者： SUN Yong-ping School of Electronics and Information Zhejiang University of Media and Communications Hangzhou 310018 China

The existence of nondecreasing positive solutions for the nonlinear third-order twopoint boundary value problem u′″（t）＋ q（t）f（t,u（t）,u′（t）） = 0, 0 〈 t 〈 1, u（0） = u″（0） = u′（1） = 0 is studied.... 详细信息

关键词： third-order two-point boundary value problem monotone iterative method positive solution,existence iterative scheme

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Three Symmetric Positive Solutions for Second-order Nonlocal Boundary Value Problems

引用

Acta Mathematicae Applicatae Sinica 2011年第2期27卷 233-242页

作者： Yong-ping Sun College of Electron and Information Zhejiang University of Media and Communications Hangzhou 310018China

Using the Leggett-Williams fixed point theorem, we will obtain at least three symmetric positive solutions to the second-order nonlocal boundary value problem of the form u″（t）＋g（t）f（t,u（t））=0,0〈t〈1,u（0）=u（1）=∫01m（s）u（s）ds. where m ∈ L1[0 1], g ：（0, 1）→ [0, ∞） is continuous, symmetric on （0, 1） and maybe singular at t = 0 and t = 1, f： [0, 1] × [0, ∞） → [0, ∞） is continuous and f（-, x） is symmetric on [0, 1] for all x∈ [0, ∞）.

关键词： symmetric positive solution nonlocal boundary value problem fixed point theorem

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：