检索结果-南通市图书馆

Reconfiguring wireless environments via intelligent surfaces for 6G: reflection, modulation, and security

Science China(Information Sciences) 2023年第3期66卷 60-79页

作者： Jindan XU Chau YUEN Chongwen HUANG naveed UL HASSAN George C.ALEXANDROPOULOS Marco DI RENZO Mérouane DEBBAH Engineering Product Development Pillar Singapore University of Technology and Design College of Information Science and Electronic Engineering Zhejiang University Department of Electrical Engineering Lahore University of Management Sciences Department of Informatics and Telecommunications National and Kapodistrian University of Athens Technology Innovation Institute Université Paris-Saclay CNRS Centrale Supélec Laboratoire des Signaux et Systèmes

The reconfigurable intelligent surface(RIS) has been recognized as an essential enabling technology for sixth-generation(6G) mobile communication networks. An RIS comprises a large number of small and low-cost reflecting elements whose parameters can be dynamically adjusted with a programmable *** of these elements can effectively reflect a phase-shifted version of the incident electromagnetic wave. By configuring the wave phases in real time, the propagation environment of the information-bearing signals can be dynamically manipulated to enhance communication reliability, boost transmission rate, expand cellular coverage, and strengthen communication security. In this study, we provide an overview on RIS-assisted wireless communications. Specifically, we elaborate on the state-of-the-art enabling techniques for the RIS technology as well as their corresponding substantial benefits from the perspectives of RIS reflection and RIS modulation. With these benefits, we envision the integration of RISs into emerging applications for6G. In addition, communication security is of unprecedented importance in future 6G networks with ubiquitous wireless services in multifarious verticals and areas. We highlight potential contributions of RISs to physical-layer security, in terms of secrecy rate and secrecy outage probability, exemplified by a typical case study from both theoretical and numerical aspects. Finally, we discuss challenges and opportunities on the deployment of RISs in practice to motivate future research.

关键词： reconfigurable intelligent surface physical-layer security RIS-assisted wireless communications phase modulation 6G

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

A Novel Robust Watermarking Algorithm for Encrypted Medical Image Based on DTCWT-DCT and Chaotic Map

引用

Computers, Materials & Continua 2019年第8期61卷 889-910页

作者： Jing Liu Jingbing Li Jieren Cheng Jixin Ma naveed Sadiq Baoru Han Qiang Geng Yang Ai College of Information Science and Technology Hainan UniversityHaikou570228China School of Computing and Mathematical Sciences Faculty of Liberal Arts and SciencesUniversity of GreenwichGreenwichLondonSE109LSUK Ocean College Zhejiang UniversityHangzhou310058China College of Medical Informatics Chongqing Medical UniversityChongqing400016China Faculty of Network Science Haikou University of EconomicsHaikou571127China

In order to solve the problem of patient information security protection in medical images,whilst also taking into consideration the unchangeable particularity of medical images to the lesion area and the need for medical images themselves to be protected,a novel robust watermarking algorithm for encrypted medical images based on dual-tree complex wavelet transform and discrete cosine transform(DTCWT-DCT)and chaotic map is proposed in this ***,DTCWT-DCT transformation was performed on medical images,and dot product was per-formed in relation to the transformation matrix and logistic *** transformation was undertaken to obtain encrypted medical ***,in the low-frequency part of the DTCWT-DCT transformation coefficient of the encrypted medical image,a set of 32 bits visual feature vectors that can effectively resist geometric attacks are found to be the feature vector of the encrypted medical image by using perceptual *** that,different logistic initial values and growth parameters were set to encrypt the watermark,and zero-watermark technology was used to embed and extract the encrypted medical images by combining cryptography and third-party *** proposed watermarking algorithm does not change the region of interest of medical images thus it does not affect the judgment of ***,the security of the algorithm is enhanced by using chaotic mapping,which is sensitive to the initial value in order to encrypt the medical image and the *** simulation results show that the pro-posed algorithm has good homomorphism,which can not only protect the original medical image and the watermark information,but can also embed and extract the watermark directly in the encrypted image,eliminating the potential risk of decrypting the embedded watermark and extracting *** with the recent related research,the proposed algorithm solves the contradiction between robustness and invisibility of the watermarking al

关键词： Encrypted medical images zero-watermarking DTCWT perceptual hash chaotic map

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

Novel LaFe_(2)O_(4)spinel structure with a large oxygen reduction response towards protonic ceramic fuel cell cathode

引用

Journal of Rare Earths 2023年第3期41卷 413-421,I0004页

作者： Jinping Wang Yuzheng Lu naveed Mushtaq M.A.K Yousaf Shah Sajid Rauf Peter D.Lund Muhammad Imran Asghar School of Energy and Power Engineering Nanjing Institute of TechnologyNanjing 211167China School of Electronic Engineering Nanjing Xiao Zhuang UniversityNanjing 211171China Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology/Energy Storage Joint Research Center School of Energy and EnvironmentSoutheast UniversityNanjing 210096China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518000China New Energy Technologies Group Department of Applied PhysicsAalto University School of ScienceP.O.Box.15100FI00076AaltoEspooFinland Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Faculty of Physics and Electronic ScienceHubei UniversityWuhan 430062China

Highly active and stable electrocatalysts are mandatory for developing high-performance and longlasting fuel *** current study demonstrates a high oxygen reduction reaction(ORR)electrocatalytic activity of a novel spinel-structured LaFe_(2)O_(4)via a self-doping *** LaFe_(2)O_(4)demonstrates excellent ORR activity in a protonic ceramic fuel cell(PCFC)at temperature range of 350-500℃.The high ORR activity of LaFe_(2)O_(4)is mainly attributed to the facile release of oxide and proton ions,and improved synergistic incorporation abilities associated with interplay of multivalent Fe^(3+)/Fe^(2+)and La^(3+)*** LaFe_(2)O_(4)as cathode over proton conducting BaZr_(0.4)Ce_(0.4)Y_(0.2)O_(3)(BZCY)electrolyte,the fuel cell has delivered a high-power density of 806 mW/cm^(2)operating at 500℃.Different spectroscopic and calculations methods such as UV-visible,Raman,X-ray photoelectron spectroscopy and density functional theory(DFT)calculations were performed to screen the potential application of LaFe_(2)O_(4)as *** study would help in developing functional cobalt-free ORR electrocatalysts for low temperature-PCFCs(LT-PCFCs)and solid oxide fuel cells(SOFCs)applications.

关键词： LaFe_(2)O_(4)cathode Facile Fe^(3+/2+)ions resale Oxygen reductionreaction(ORR) Excellent electrocatalyst Protonic ceramicfuel cell(PCFC) Rare earths

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

Text Augmentation-Based Model for Emotion Recognition Using Transformers

引用

Computers, Materials & Continua 2023年第9期76卷 3523-3547页

作者： Fida Mohammad Mukhtaj Khan Safdar Nawaz Khan Marwat naveed Jan Neelam Gohar Muhammad Bilal Amal Al-Rasheed Department of Computer Science The University of HaripurHaripur22620Pakistan Department of Computer Systems Engineering Faculty of Electrical and Computer EngineeringUniversity of Engineering and Technology PeshawarPeshawar25120Pakistan Department of Electronics Engineering Technology University of TechnologyNowshera24100Pakistan Department of Computer Science Shaheed Benazir BhuttoWomen UniversityPeshawar25000Pakistan Department of Information Systems College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh11671Saudi Arabia

Emotion Recognition in Conversations(ERC)is fundamental in creating emotionally ***-BasedNetwork(GBN)models have gained popularity in detecting conversational contexts for ERC ***,their limited ability to collect and acquire contextual information hinders their *** propose a Text Augmentation-based computational model for recognizing emotions using transformers(TA-MERT)to address *** proposed model uses the Multimodal Emotion Lines Dataset(MELD),which ensures a balanced representation for recognizing human *** used text augmentation techniques to producemore training data,improving the proposed model’s *** encoders train the deep neural network(DNN)model,especially Bidirectional Encoder(BE)representations that capture both forward and backward contextual *** integration improves the accuracy and robustness of the proposed ***,we present a method for balancing the training dataset by creating enhanced samples from the original *** balancing the dataset across all emotion categories,we can lessen the adverse effects of data imbalance on the accuracy of the proposed *** results on the MELD dataset show that TA-MERT outperforms earlier methods,achieving a weighted F1 score of 62.60%and an accuracy of 64.36%.Overall,the proposed TA-MERT model solves the GBN models’weaknesses in obtaining contextual data for ***-MERT model recognizes human emotions more accurately by employing text augmentation and transformer-based *** balanced dataset and the additional training samples also enhance its *** findings highlight the significance of transformer-based approaches for special emotion recognition in conversations.

关键词： Emotion recognition in conversation graph-based network text augmentation-basedmodel multimodal emotion lines dataset bidirectional encoder representation for transformer

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

Effects of viscous dissipation and slip velocity on two-dimensional and axisymmetric squeezing flow of Cu-water and Cu-kerosene nanofluids

引用

Propulsion and Power Research 2015年第1期4卷 40-49页

作者： Umar Khan naveed Ahmed Mir Asadullah Syed Tauseef Mohyud-din Department of Mathematics Faculty of SciencesHITEC UniversityTaxila CanttPakistan COMSATS Institute of Information Technology University RoadAbbottabadPakistan

Squeezing flow of nanofluids has been taken into account under the effects of viscous dissipation and velocity *** types of base fluids are used to study the behavior of Copper nanoparticles between parallel *** ordinary differential equations governing the flow are obtained by imposing similarity transformations on conservation *** equations are solved by using an efficient analytical technique the variation of parameters method(VPM).Influences of nanoparticle concentration and different emerging parameters on flow profiles are presented graphically coupled with comprehensive discussions.A numerical solution is also sought for the sake of *** of different parameters on skin friction coefficient and Nusselt number is also discussed.

关键词： Squeezing flow Nanofluids Variation of parameters method(VPM) Velocity slip Numerical solution

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

Efficient construction of a substitution box based on a Mordell elliptic curve over a finite field

引用

Frontiers of Information Technology & Electronic Engineering 2019年第10期20卷 1378-1389页

作者： naveed Ahmed AZAM Umar HAYAT Ikram ULLAH Department of Applied Mathematics and Physics Graduate School of InformaticsKyoto UniversityKyoto 606-8501Japan Department of Mathematics Quaid-i-Azam UniversityIslamabad 44000Pakistan

Elliptic curve cryptography has been used in many security systems due to its small key size and high security compared with other cryptosystems. In many well-known security systems, a substitution box (S-box) is the only non-linear component. Recently, it has been shown that the security of a cryptosystem can be improved using dynamic S-boxes instead of a static S-box. This necessitates the construction of new secure S-boxes. We propose an efficient method to generate S-boxes that are based on a class of Mordell elliptic curves over prime fields and achieved by defining different total orders. The proposed scheme is devel-oped in such a way that for each input it outputs an S-box in linear time and constant space. Due to this property, our method takes less time and space than the existing S-box construction methods over elliptic curves. Computational results show that the pro-posed method is capable of generating cryptographically strong S-boxes with security comparable to some of the existing S-boxes constructed via different mathematical structures.

关键词： Substitution box Finite field Mordell elliptic curve Total order Computational complexity

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

Analysis of Pneumonia Model via Efficient Computing Techniques

引用

Computers, Materials & Continua 2022年第3期70卷 6073-6088页

作者： Kamaledin Abodayeh Ali Raza Muhammad Rafiq Muhammad Shoaib Arif Muhammad naveed Zunir Zeb Syed Zaheer Abbas Kiran Shahzadi Sana Sarwar Qasim naveed Badar Ul Zaman Muhammad Mohsin Department of Mathematics and General Sciences Prince Sultan University Riyadh66833Saudi Arabia Department of Mathematics Govt.Maulana Zafar Ali Khan Graduate College Wazirabad52000Punjab Higher Education Department(PHED)Lahore54000Pakistan Department of Mathematics National College of Business Administration and Economics Lahore54660Pakistan Department of Mathematics Faculty of SciencesUniversity of Central PunjabLahore54500Pakistan Department of Mathematics Air UniversityIslamabad44000Pakistan Department of Mathematics Technische Universitat Chemnitz6209111Germany

Pneumonia is a highly transmissible disease in *** to the World Health Organization(WHO),the most affected regions include south Asia and sub-Saharan ***,15%of pediatric deaths can be attributed to *** techniques have a significant role in science,engineering,and many other *** this study,we focused on the efficiency of numerical techniques via computer *** studied the dynamics of the pneumonia-like infections of epidemic models using numerical *** discuss two types of analysis:dynamical and *** dynamical analysis included positivity,boundedness,local stability,reproduction number,and equilibria of the *** also discusswell-known computing techniques including Euler,Runge Kutta,and non-standard finite difference(NSFD)for the *** non-standard finite difference(NSFD)technique shows convergence to the true equilibrium points of the model for any time step ***,Euler and Runge Kutta do not work well over large time *** techniques are the suitable tool for crosschecking the theoretical analysis of the model.

关键词： Pneumonia disease epidemic model computing techniques convergence analysis

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

Polymeric assembled nanoparticles through kinetic stabilization by confined impingement jets dilution mixer for fluorescence switching imaging

引用

Chinese Journal of Chemical Engineering 2023年第4期56卷 89-96页

作者： Jingran Liu Yue Wu Jie Tang Tao Wang Feng Ni Qiumin Wu Xijiao Yang Ayyaz Ahmad naveed Ramzan Yisheng Xu State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China Shanghai Shyndec Pharmaceutical Co. LtdShanghai 200040China Department of Chemical Engineering Muhammad Nawaz Sharif University of Engineering and TechnologyMultanPakistan Faculty of Chemical Metallurgicaland Polymer EngineeringUniversity of Engineering&TechnologyLahorePakistan

Traditional fluorescence switching molecules achieving the state change between on and off states commonly based on UV irradiation. However, it is worth noting that UV irradiation is harmful to both the cancer cells and the normal cells. To achieve fluorescence switching under visible wavelength and avoid complicate molecular design, a fluorophore of 2,4,5,6-tetrakis(carbazol-9-yl)-1,3-dicyanobenzene(4Cz IPN) and a quencher of diarylethene(DAE) were physically incorporated within the biocompatible block copolymer poly(lactic-co-glycolic acid)-b-poly(ethylene glycol)(PLGA-b-PEG) to form 4Cz IPNDAE nanoparticles(NPs) through flash nanoprecipitation(FNP). By using the FNP method, the NPs were prepared within milliseconds in a confined impingement jets dilution(CIJ-D) mixer. Quenching and recovery of fluorescence could achieve in the presence of DAE under 475 nm and 560 nm *** structure and fluorescent properties of the nanoparticles can be tuned by external conditions for their efficient fluorescence resonance energy transfer(FRET) in a kinetic stabilization process. This NPs formation process was further optimized by varying the dilution ratio, Reynolds number(Re) and polymer concentration to modulate the mixing and particle nucleation and growth process. The size and fluorescence switching properties of the NPs were systematically investigated in solution and in cellular uptake experiments. This work is anticipated to provide a simple and highly effective engineering strategy for the modulation of fluorescence switching nanoparticles and beneficial to its engineering application.

关键词： Preparation Kinetic stabilization Flash nanoprecipitation Nanoparticles Fluorescence switch

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

锌金属可充电电池研究现状及展望

引用

硅酸盐学报 2020年第7期48卷 1003-1012页

作者：陈加航李婷婷 Ahmad naveed 王久林上海交通大学化工系上海200240 上海电力大学环境与化学工程学院上海200090 郑州大学化学系郑州450001

金属锌凭借高比容量、高丰度、环境友好性和经济性,被认为是一种电池负极材料的理想候选者。然而,锌金属负极本身存在的枝晶、形变、钝化及自腐蚀问题限制了锌金属可充电电池的发展和应用,根源在于锌与水基电解质热力学不稳定。研究表明... 详细信息

金属锌凭借高比容量、高丰度、环境友好性和经济性,被认为是一种电池负极材料的理想候选者。然而,锌金属负极本身存在的枝晶、形变、钝化及自腐蚀问题限制了锌金属可充电电池的发展和应用,根源在于锌与水基电解质热力学不稳定。研究表明,锌复合负极、表面处理、三维电极结构以及电解液添加剂和电解液体系探究可以有效缓解上述问题。从锌负极设计和电解液优化2方面整理总结了近年来报导的相关工作,并结合最新提出的新型可逆锌基储能体系,对下一步锌二次电池发展做出展望。

关键词：锌金属负极锌枝晶锌负极设计电解液优化锌二次电池

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

Automatic Speaker Recognition Using Mel-Frequency Cepstral Coefficients Through Machine Learning

引用

Computers, Materials & Continua 2022年第6期71卷 5511-5521页

作者： U˘gur Ayvaz Hüseyin Gürüler Faheem Khan naveed Ahmed Taegkeun Whangbo Abdusalomov Akmalbek Bobomirzaevich Department of Computer Engineering Istanbul Technical UniversityIstanbul34485Turkey Department of Information Systems Engineering Mugla Sitki Kocman UniversityMugla48000Turkey Artificial Intelligence Lab Department of Computer EngineeringGachon UniversitySeongnam13557Korea Department of Computer Science College of Computing and InformaticsUniversity of SharjahSharjah27272UAE

Automatic speaker recognition(ASR)systems are the field of Human-machine interaction and scientists have been using feature extraction and feature matching methods to analyze and synthesize these *** of the most commonly used methods for feature extraction is Mel Frequency Cepstral Coefficients(MFCCs).Recent researches show that MFCCs are successful in processing the voice signal with high *** represents a sequence of voice signal-specific *** experimental analysis is proposed to distinguish Turkish speakers by extracting the MFCCs from the speech *** the human perception of sound is not linear,after the filterbank step in theMFCC method,we converted the obtained log filterbanks into decibel(dB)features-based spectrograms without applying the Discrete Cosine Transform(DCT).A new dataset was created with converted spectrogram into a 2-D *** learning algorithms were implementedwith a 10-fold cross-validationmethod to detect the *** highest accuracy of 90.2%was achieved using Multi-layer Perceptron(MLP)with tanh activation *** most important output of this study is the inclusion of human voice as a new feature set.

关键词： Automatic speaker recognition human voice recognition spatial pattern recognition MFCCs spectrogram machine learning artificial intelligence

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

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：