检索结果-南通市图书馆

A lightweight symmetric image encryption cryptosystem in wavelet domain based on an improved sine map

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

Chinese Physics B 2024年第3期33卷 266-276页

作者：陈柏池黄林青蔡述庭熊晓明张慧 school of Advanced Manufacturing Guangdong University of TechnologyJieyang 522000China school of Integrated Circuits Guangdong University of TechnologyGuangzhou 510006China school of Automation Guangdong University of TechnologyGuangzhou 510006China

In the era of big data,the number of images transmitted over the public channel increases *** a result,it is crucial to devise the efficient and highly secure encryption method to safeguard the sensitive *** this paper,an improved sine map(ISM)possessing a larger chaotic region,more complex chaotic behavior and greater unpredictability is proposed and extensively *** upon the strengths of ISM,we introduce a lightweight symmetric image encryption cryptosystem in wavelet domain(WDLIC).The WDLIC employs selective encryption to strike a satisfactory balance between security and ***,only the low-frequency-low-frequency component is chosen to encrypt utilizing classic permutation and *** leveraging the statistical properties in wavelet domain,Gaussianization operation which opens the minds of encrypting image information in wavelet domain is first proposed and employed to all *** and theoretical analysis demonstrate the high speed and the remarkable effectiveness of WDLIC.

关键词： image encryption discrete wavelet transform 1D-chaotic system selective encryption Gaussianization operation

Minimally invasive technology for continuous glucosemonitoring

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2022年第1期5卷 9-13页

作者： Xinshuo huang Jingbo yang Shuang huang Hui-jiuan Chen Xi Xie State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Sensor technology and Biomedical Instrument School of Biomedical EngineeringShenzhen Campus of Sun Yat-Sen UniversityShenzhen 518107China

Introduction Despite the numerous breakthroughs made in medical and biomedical technologies,biosensing underneath the skin without any associated pain still sounds like a dream yet to be *** invasive biosensors refer to functional or electronic sensors that can contact the interior environment of living organisms and their biological tissues,while the connected bulk devices remain on the surface of the biological objects[1].Minimally invasive biosensors are currently a key research area because they can not only meet the increasing technical demands to precisely detect biological activities inside biological objects,but also provide an ideal platform to externally incorporate complicated functionalities and electronic integration[2..The current development level of minimally invasive sensing still necessitates solving the constraints and bottlenecks in the three aspects of functionalities,sensitivity and biocompatibility[3].In this perspective,we select minimally invasive sensors as a representative research object with the aim to solve the limitations of current diabetes diagnosis and treatment approaches.

关键词： breakthrough interior diagnosis

在线全文

学校读者我要写书评

暂无评论

基于龙格库塔法的对抗攻击方法

软件学报 2024年第5期35卷 2543-2565页

作者：万晨黄方军中山大学计算机学院广东广州510006 中山大学网络空间安全学院广东深圳518107 郑州信大先进技术研究院河南郑州450001

深度神经网络在许多领域中取得了显著的成果,但相关研究结果表明,深度神经网络很容易受到对抗样本的影响.基于梯度的攻击是一种流行的对抗攻击,引起了人们的广泛关注.研究基于梯度的对抗攻击与常微分方程数值解法之间的关系,并提出一种... 详细信息

深度神经网络在许多领域中取得了显著的成果,但相关研究结果表明,深度神经网络很容易受到对抗样本的影响.基于梯度的攻击是一种流行的对抗攻击,引起了人们的广泛关注.研究基于梯度的对抗攻击与常微分方程数值解法之间的关系,并提出一种新的基于常微分方程数值解法-龙格库塔法的对抗攻击方法.根据龙格库塔法中的预测思想,首先在原始样本中添加扰动构建预测样本,然后将损失函数对于原始输入样本和预测样本的梯度信息进行线性组合,以确定生成对抗样本中需要添加的扰动.不同于已有的方法,所提出的方法借助于龙格库塔法中的预测思想来获取未来的梯度信息(即损失函数对于预测样本的梯度),并将其用于确定所要添加的对抗扰动.该对抗攻击具有良好的可扩展性,可以非常容易地集成到现有的所有基于梯度的攻击方法.大量的实验结果表明,相比于现有的先进方法,所提出的方法可以达到更高的攻击成功率和更好的迁移性.

关键词：对抗样本黑盒攻击龙格库塔法迁移性

在线全文

学校读者我要写书评

暂无评论

图像超分辨率重建中的细节互补卷积模型

中国图象图形学报 2018年第4期23卷 572-582页

作者：李浪宇苏卓石晓红黄恩博罗笑南中山大学数据科学与计算机学院广州510006 中山大学国家数字家庭工程技术研究中心广州510006 中山大学深圳研究院深圳518057 中山大学新华学院信息科学学院广州510520 桂林电子科技大学计算机与信息安全学院桂林541004

目的现有的超分辨卷积神经网络为了获得良好的高分辨率图像重建效果需要越来越深的网络层次和更多的训练,因此存在了对于样本数量依懒性大,参数众多致使训练困难以及训练所需迭代次数大,硬件需求大等问题。针对存在的这些问题,本文提出... 详细信息

目的现有的超分辨卷积神经网络为了获得良好的高分辨率图像重建效果需要越来越深的网络层次和更多的训练,因此存在了对于样本数量依懒性大,参数众多致使训练困难以及训练所需迭代次数大,硬件需求大等问题。针对存在的这些问题,本文提出一种改进的超分辨率重建网络模型。方法本文区别于传统的单输入模型,采取了一种双输入细节互补的网络模型,在原有的SRCNN单输入模型特征提取映射网络外,添加了一个新的输入。本文结合图像局部相似性,构建了一个细节补充网络来补充图像特征,并使用一层卷积层将细节补充网络得到的特征与特征提取网络提取的特征融合,恢复重建高分辨率图像。结果本文分别从主观和客观的角度,对比了本文方法与其他主流方法之间的数据对比和效果对比情况,在与SRCNN在相似网络深度的情况下,本文方法在放大3倍时的PSNR数值在Set5以及Set14.据下分别比SRCNN高出0.17 d B和0.08 d B。在主观的恢复图像效果上,本文方法能够很好的恢复图像边缘以及图像纹理细节。结论实验证明,本文所提出的细节互补网络模型能够在较少的训练以及比较浅的网络下获得有效的重建图像并且保留更多的图像细节。

关键词：超分辨重建深度学习卷积神经网络非线性映射

A New Class of Multi-wavelet Bases: V-System

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2012年第1期28卷 105-120页

作者： Chao huang Li Hua yang Dong Xu QI College of Mathematics and Computational science Shenzhen UniversityShenzhen 518060P.R.China school of Mathematics and Computational science Sun Yat-sen UniversityGuangdong Province Key Laboratory of Computational ScienceGuangzhou 510275P.RChina Faculty of information technology Macao University of Science and TechnologyMaeauP.R.China

The V-system is a complete orthogonal system of functions defined on the interval [0, 1], generated by finite Legendre polynomials and the dilation and translation of a function generator, which consists of a finite number of continuous and discontinuous functions. The V-system has interesting properties, such as orthogonality, symmetry, completeness and short compact support. It is shown in this paper that the V-system is essentially a special multi-wavelet basis. As a result, some basic properties of the V-system are established through the well-developed theory of multi-wavelets. From this point of view, more other V-systems are constructed.

关键词： Multi-wavelets V-system complete orthogonal system

Learning Human-Written Commit Messages to Document Code Changes

在线全文

学校读者我要写书评

暂无评论

Journal of Computer science & technology 2020年第6期35卷 1258-1277页

作者： Yuan huang Nan Jia Hao-Jie Zhou xiang-Ping Chen Zi-Bin Zheng Ming-Dong Tang National Engineering Research Center of Digital Life School of Data and Computer ScienceSun Yat-sen University Guangzhou 510006China school of information Engineering Hebei GEO UniversityShijiazhuang 050031China Guangdong Key Laboratory for Big Data Analysis and Simulation of Public Opinion School of Communication and DesignSun Yat-sen UniversityGuangzhou 510006China school of information {2. and technology Guangdong University of Foreign StudiesGuangzhou 510006China Guangdong Key Laboratory of Big Data Analysis and Processing Guangzhou 510006China

Commit messages are important complementary information used in understanding code changes. To address message scarcity, some work is proposed for automatically generating commit messages. However, most of these approaches focus on generating summary of the changed software entities at the superficial level, without considering the intent behind the code changes (e.g., the existing approaches cannot generate such message:"fixing 'null' pointer exception"). Considering developers often describe the intent behind the code change when writing the messages, we propose ChangeDoc, an approach to reuse existing messages in version control systems for automatical commit message generation. Our approach includes syntax, semantic, pre-syntax, and pre-semantic similarities. For a given commit without messages, it is able to discover its most similar past commit from a large commit repository, and recommend its message as the message of the given commit. Our repository contains half a million commits that were collected from SourceForge. We evaluate our approach on the commits from 10 projects. The results show that 2..5% of the recommended messages by ChangeDoc can be directly used without modification, and 62.8% require minor modifications. In order to evaluate the quality of the commit messages recommended by ChangeDoc, we performed two empirical studies involving a total of 4. participants (10 professional developers and 30 students). The results indicate that the recommended messages are very good approximations of the ones written by developers and often include important intent information that is not included in the messages generated by other tools.

关键词： commit message recommendation code syntax similarity code semantic similarity code change comprehension

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

一种等通量波束的多极化可重构天线

华南理工大学学报（自然科学版） 2024年第3期52卷 131-140页

作者：靳贵平潘伟浩黄珏泓廖绍伟华南理工大学电子与信息学院广东广州510640

随着航天技术的革新,对近地轨道的通信需求逐年增高。近地轨道卫星就在此背景下产生,主要应用于遥感探测天气预报和数据通信领域。由于近地轨道卫星天线辐射波束所覆盖的地球表面是球面,因此波束通常设计为等通量形式。由于卫星通信通... 详细信息

随着航天技术的革新,对近地轨道的通信需求逐年增高。近地轨道卫星就在此背景下产生,主要应用于遥感探测天气预报和数据通信领域。由于近地轨道卫星天线辐射波束所覆盖的地球表面是球面,因此波束通常设计为等通量形式。由于卫星通信通常存在极化失配、多径效应等问题,选择多极化而不是圆极化作为近地卫星天线的工作状态能更好地适应复杂的工作环境,保证通信质量,将等通量波束天线和多极化可重构技术结合起来有很大的应用前景。基于一对正交圆极化波能合成线极化波的设计原理,文中提出了一种具有等通量波束的多极化可重构天线,该天线由可重构馈电网络和带扼流环的隔片极化器圆波导组成。馈电网络中嵌入单刀四掷开关(SP4.)与单刀双掷开关(SP2.),通过改变开关的工作状态,馈电网络将给圆波导提供不同的馈电条件,在圆波导内隔片的作用下天线实现两种圆极化与两种线极化的可重构。通过在圆波导口引入扼流环以及波导口作“T”型开槽处理,实现波束赋形,并且保证天线在不同极化状态下辐射等通量波束。实测结果显示,天线在不同的极化状态下-15 dB重叠阻抗带宽14.7%,覆盖4.80~5.56 GHz,方向图顶部在θ为-2.0}~+2.0}范围内具有平坦效果,圆极化状态下空间轴比覆盖-51°~+50°,覆盖范围大于方向图顶部平坦范围。天线实测结果与仿真结果有较好的一致性,具有多极化和方向图顶部平坦的优势,可满足移动通信和卫星通信中多极化应用场景的需要。

关键词：极化可重构天线等通量方向图圆极化线极化

A Pilot Contamination Avoidance Based on Pilot Pattern Design for Ultra-Dense Network

在线全文

学校读者我要写书评

暂无评论

China Communications 2020年第12期17卷 235-246页

作者： Jie huang Fan yang Yiwen Gao Zhiming Wang Jun Zhong school of Electrical and Electronic Engineering Chongqing University of TechnologyChongqing 400054China China Mobile Group Chongqing Co.Ltd Chongqing 400044China Electric Power Research Institute China Southern Power GridGuangzhou 510663China State Grid Chongqing Electric Power Company Chongqing 400015China

With the ever-growing number of base stations(BSs)and user equipments(UEs)in ultra-dense networks(UDN),reusing the same pilot sequences among the cells is *** pilot reuse scheme,the channel estimation obtained at a BS contains not only the desired channel-state information(CSI)but also interference from neighboring cells,which can severely degrade CSI estimation performance and adversely affect communication *** this paper we consider a pilot contamination avoidance based on pilot pattern design for UDN where the pilot reuse employed and the interfering users from neighboring cells may be not at lower power levels at the BS compared to the in-cell *** present a novel statistical interference model of sub-carriers to describe the non-deterministic interference from neighboring ***,we provide a pilot pattern design model with non-uniform pilot *** on this,a pilot contamination avoidance based on pilot pattern design is proposed where pilot reuse scheme and the non-deterministic interference from neighboring cells are taken into *** existing interference mitigation approaches,the proposed method eliminates interference through the method of interference avoidance and can be applied to different kinds of channel estimation *** results showed that the proposed approach can effectively avoid the interference and ensure the accuracy of channel estimation.

关键词： ultra-dense networks(UDN) pilot reuse interference avoidance pilot pattern design

Functional signatures: new definition and constructions

在线全文

学校读者我要写书评

暂无评论

science China(information sciences) 2021年第12期64卷 189-201页

作者： Qingwen GUO Qiong huang Sha MA Meiyan XIAO Guomin yang Willy SUSILO College of Mathematics and Informatics South China Agricultural University guangzhou Key Laboratory of Intelligent Agriculture South China Agricultural University school of Computing and information {2. University of Wollongong

Functional signatures(FS) enable a master authority to delegate its signing privilege to an assistant. Concretely, the master authority uses its secret key skFto issue a signing key skffor a designated function f ∈ FFSand sends both f and skfto the assistant E, which is then able to compute a signature σf with respect to pkFfor a message y in the range of f. In this paper, we modify the syntax of FS slightly to support the application scenario where a certificate of authorization is necessary. Compared with the original FS, our definition requires that FFSis an injective function family and for any f0, f1 ∈ FFS there does not exist an intersection between range(f0) and range(f1). Accordingly, we redefine the security of FS and introduce two additional security notions, called unlinkability and accountability. Signatures σfin our definition do not expose the intention of the master authority. We propose two constructions of FS. The first one is a generic construction based on signatures with perfectly re-randomizable keys, non-interactive zero-knowledge proof(NIZK) and traditional digital signatures, and the other is based on RSA(RivestShamir-Adleman) signatures with full domain hash and NIZK. We prove that both schemes are secure under the given security models.

关键词： cloud computation security digital signature functional signature non-interactive zero-knowledge proof e-commerce