检索结果-内蒙古大学图书馆

Incremental Plastic Analysis of Confined Concrete Considering the Variation of Elastic Moduli

iranian Journal of science and technology - Transactions of Civil engineering 2024年第6期48卷 4521-4538页

作者： Rasouli, Mohammad Baghdarnia, Saeed Broujerdian, Vahid School of Civil Engineering Iran University of Science and Technology Tehran Iran

Experimental studies have demonstrated that the elastic moduli of concrete, specifically Young’s modulus and Poisson’s ratio, undergo changes during compressive loading. Despite the fact that variations in Young’s modulus are frequently considered in nonlinear analyses, Poisson’s ratio is typically assumed to be constant, which has a direct impact on confinement modeling. In this research project, an attempt was made to enhance the accuracy of predicting the behavior of concrete columns confined by AFRP and CFRP by considering the variation of elastic moduli of concrete during loading. To account for the changes of Poisson’s ratio, an approximate method was proposed that involves assembling a three-part stress–strain curve. The first and last parts of the curve coincide with the stress–strain curves obtained by the limit Poisson’s ratio of 0.2 and 0.5, respectively, while a linear function serves as the transition curve in the middle region. The parameters of the middle zone were calculated using two different approaches: the first involved data fitting and optimization, while the second entailed using a proposed closed-form equation. The finite element program ABAQUS was employed to conduct incremental plastic analyses within the Concrete Damage Plasticity framework. The proposed model is capable of predicting the complete axial compressive stress–strain curve of concrete columns confined by AFRP and CFRP under monotonic compressive loading. A corroboration study was conducted using an experimental dataset from 24 concrete short column test specimens confined by AFRP and CFRP with a wide range of properties. The results showed that the average errors of both the proposed methods are nearly 3%. It means that both the numerical methods generally have a similar and acceptable precision. © The Author(s), under exclusive licence to Shiraz university 2024.

关键词： AFRP CFRP Confinement Finite element method Plasticity Poisson’s ratio

来源：评论

学校读者我要写书评

暂无评论

Task offloading delay minimization in vehicular edge computing based on vehicle trajectory prediction

引用

Digital Communications and Networks 2025年第2期11卷 537-546页

作者： Feng Zeng Zheng Zhang Jinsong Wu School of Computer Science and Engineering Central South UniversityChangsha410083China School of Artificial Intelligence Guilin University of Electronic TechnologyGuilin541000China The Department of Computer Science Universidad de ChileSantiagoChile

In task offloading,the movement of vehicles causes the switching of connected RSUs and servers,which may lead to task offloading failure or high service *** this paper,we analyze the impact of vehicle movements on task offloading and reveal that data preparation time for task execution can be minimized via forward-looking ***,a Bi-LSTM-based model is proposed to predict the trajectories of *** service area is divided into several equal-sized *** the actual position of the vehicle and the predicted position by the model belong to the same grid,the prediction is considered correct,thereby reducing the difficulty of vehicle trajectory ***,we propose a scheduling strategy for delay optimization based on the vehicle trajectory *** the inevitable prediction error,we take some edge servers around the predicted area as candidate execution servers and the data required for task execution are backed up to these candidate servers,thereby reducing the impact of prediction deviations on task offloading and converting the modest increase of resource overheads into delay reduction in task *** results show that,compared with other classical schemes,the proposed strategy has lower average task offloading delays.

关键词： Vehicular edge computing Task offloading Vehicle trajectory prediction Delay minimization Bi-LSTM model

来源：评论

学校读者我要写书评

暂无评论

Foam drainage modeling of vertical foam column and validation with experimental results

引用

Petroleum Research 2024年第4期9卷 586-598页

作者： S.M.Hosseini-Nasab M.Rezaee P.L.J.Zitha School of Chemical Petroleum and Gas EngineeringIran University of Science and TechnologyTehranIran Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Department of Geoscience&Engineering Petroleum Engineering GroupDelft University of TechnologyNetherlands

The understanding of the mechanisms behind foam generation and the structure of foam itself form the basis of foam-related experiments for its application in Enhanced Oil Recovery and overcoming gas in-jection *** insights in this paper towards the theory of foam generation can help explain experimental results and lead to improved formulas of the applied substances and *** study aims to investigate the mechanisms behind foam generation and the structure of foam by specific laboratory experiments and theoretical *** liquid drainage through interconnected Plateau borders was found to be the most critical foam decay mechanism for this particular *** justification of the foam drainage equation was demonstrated by comparing the numerical solution with the outcome of a few bulk *** discrepancies were described according to the limitations of both the theory and the experimental *** modelling gives more profound knowledge in more detail of the different stages in foam drainage than experimental data can deliver,which is because of the lack of continuous measurement of foam conductivity for the foam bulk ***,a comprehension of foam modelling investigation and comparison is required to gain a deeper understanding of foam behaviour.

关键词： Foam EOR Drainage Stability Foam modelling Foam viscosity

来源：评论

学校读者我要写书评

暂无评论

An overview on IRS-enabled sensing and communications for 6G: architectures, fundamental limits, and joint beamforming designs

引用

science China(Information sciences) 2025年第5期68卷 170-193页

作者： Xianxin SONG Yuan FANG Feng WANG Zixiang REN Xianghao YU Ye ZHANG Fan LIU Jie XU Derrick Wing Kwan NG Rui ZHANG Shuguang CUI School of Science and Engineering (SSE) Shenzhen Future Network of Intelligence Institute (FNii-Shenzhen)and Guangdong Provincial Key Laboratory of Future Networks of Intelligence The Chinese University of Hong Kong Department of Electrical Engineering City University of Hong Kong School of Information Engineering Guangdong University of Technology Key Laboratory of Wireless-Optical Communications Chinese Academy of Sciences School of Information Science and Technology University of Science and Technology of China Computer School Beijing Information Science and Technology University National Mobile Communications Research Laboratory School of Information Science and Engineering Southeast University School of Electrical Engineering and Telecommunications University of New South Wales School of Science and Engineering Shenzhen Research Institute of Big Data The Chinese University of Hong Kong Department of Electrical and Computer Engineering National University of Singapore

This study presents an overview on intelligent reflecting surface(IRS)-enabled sensing and communication for the forthcoming sixth-generation(6G) wireless networks, in which IRSs are strategically deployed to proactively reconfigure wireless environments to improve both sensing and communication(S&C) performance. First, we exploit a single IRS to enable wireless sensing in the base station's(BS's) non-line-of-sight(NLoS) area. In particular, we present three IRS-enabled NLoS target sensing architectures with fully-passive, semi-passive, and active IRSs, respectively. We compare their pros and cons by analyzing the fundamental sensing performance limits for target detection and parameter estimation. Next, we consider a single IRS to facilitate integrated sensing and communication(ISAC), in which the transmit signals at the BS are used for achieving both S&C functionalities, aided by the IRS through reflective beamforming. We present joint transmit signal and receiver processing designs for realizing efficient ISAC, and jointly optimize the transmit beamforming at the BS and reflective beamforming at the IRS to balance the fundamental performance tradeoff between S&C. Furthermore, we discuss multi-IRS networked ISAC, by particularly focusing on multi-IRS-enabled multi-link ISAC, multi-region ISAC, and ISAC signal routing, respectively. Finally, we highlight various promising research topics in this area to motivate future work.

关键词： integrated sensing and communication (ISAC) intelligent reflecting surface (IRS) non-line-of-sight (NLoS) sensing sensing and communication tradeoff

来源：评论

学校读者我要写书评

暂无评论

Double quantum images encryption scheme based on chaotic system

引用

Chinese Physics B 2024年第4期33卷 305-320页

作者：蒋社想李杨石锦张茹 School of Computer Science and Engineering Anhui University of Science and TechnologyHuainan 232001China Anhui Key Laboratory of Mine Intelligent Equipment and Technology Anhui University of Science&TechnologyHuainan 232001China

This paper explores a double quantum images representation(DNEQR)model that allows for simultaneous storage of two digital images in a quantum superposition ***,a new type of two-dimensional hyperchaotic system based on sine and logistic maps is investigated,offering a wider parameter space and better chaotic behavior compared to the sine and logistic *** on the DNEQR model and the hyperchaotic system,a double quantum images encryption algorithm is ***,two classical plaintext images are transformed into quantum states using the DNEQR ***,the proposed hyperchaotic system is employed to iteratively generate pseudo-random *** chaotic sequences are utilized to perform pixel value and position operations on the quantum image,resulting in changes to both pixel values and ***,the ciphertext image can be obtained by qubit-level diffusion using two XOR operations between the position-permutated image and the pseudo-random *** corresponding quantum circuits are also *** results demonstrate that the proposed scheme ensures the security of the images during transmission,improves the encryption efficiency,and enhances anti-interference and anti-attack capabilities.

关键词： double quantum images encryption chaotic system pixel scrambling XOR operation

来源：评论

学校读者我要写书评

暂无评论

Synthesis of antenna arrays with main lobe and sidelobes of arbitrary levels and widths

引用

International Journal of Electronics Letters 2024年第4期12卷 422-434页

作者： Khalaj-Amirhosseini, Mohammad School of Electrical Engineering Iran University of Science and Technology Tehran Iran

An analytic method is proposed to synthesise linear antenna arrays in order to have a main lobe and a specified number of sidelobes whose levels and widths are to arbitrary. This method is based on synthesising the array factor as the Summation of Contiguous Independent Lobes (SCIL). These independent lobes are similar to each other except that their levels and widths are individually specified. Then, an explicit relation is obtained for excitation currents through Fourier’s series theorem. Some examples are brought to verify the effectiveness of the proposed method. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Antenna array synthesis beamwidth of array factor sidelobe level and width

来源：评论

学校读者我要写书评

暂无评论

Success-History Based Adaptive Differential Evolution Algorithm for Discrete Structural Optimization

引用

iranian Journal of science and technology - Transactions of Civil engineering 2024年第1期49卷 409-431页

作者： Kaveh, Ali Biabani Hamedani, Kiarash School of Civil Engineering Iran University of Science and Technology Tehran Iran

Discrete structural optimization is generally regarded as a complicated optimization problem due to the presence of discrete variables. However, since metaheuristic algorithms do not require any gradient information of the objective function and constraints, they are usually well suited for discrete optimization problems. The success-history based adaptive differential evolution (SHADE) algorithm, which is a modified version of the differential evolution (DE) algorithm, employs a historical memory of successful control parameter settings to guide the generation of future control parameter values. Over the last few years, SHADE has been successfully used to solve a number of real-world optimization problems. However, to the best of our knowledge, it has not yet been applied for discrete structural optimization. In this paper, the SHADE algorithm is applied to solve discrete truss optimization problems with stress and displacement constraints. Four benchmark truss optimization problems taken from the literature are used to demonstrate the performance of the SHADE algorithm and the obtained results are presented and compared with those of other state-of-the-art metaheuristic algorithms existing in the literature. Optimization results indicate the excellent performance of the SHADE algorithm compared to other considered algorithms in terms of both solution accuracy and computational cost. © The Author(s), under exclusive licence to Shiraz university 2024.

关键词： Discrete design variables Discrete structural optimization Metaheuristic algorithms Success-history based adaptive differential evolution Truss structures

来源：评论

学校读者我要写书评

暂无评论

Face Detection Based on Improved Multi-task Cascaded Convolutional Neural Networks

IAENG International Journal of Computer Science

引用

IAENG International Journal of computer science 2024年第2期51卷 67-74页

作者： Jia, Siyu Tian, Ying College of Computer and Software Engineering University of Science and Technology Liaoning Liaoning 114051 China School of Computer and Software Engineering University of Science and Technology Liaoning Liaoning 114051 China

With the development of deep learning and computer vision, face detection has achieved rapid progress owing. Face detection has several application domains, including identity authentication, security protection, media, and entertainment. Although multi-task cascaded convolutional neural networks (MTCNN) have high accuracy and robustness, the model has the disadvantages of large parameters and computational overhead in the real scene due to the complexity of the real scene and the constraints of hardware facilities. Therefore, the development of an improved network model is crucial. This paper improves the MTCNN model by reducing the number of parameters and the computational overhead and using better model parameters to locate the key points of the face. This model improves the accuracy and robustness of the face age estimation. The WiderFace and CelebA datasets are used for training. The final face detection accuracy reaches 98.7% while simultaneously reducing the number of model parameters to 70% under the same conditions. This model meets the application needs of modern society for face detection and demonstrates the efficiency and accuracy of the improved network model. © (2024), (International Association of Engineers). All Rights Reserved.

关键词： Face recognition

来源：评论

学校读者我要写书评

暂无评论

A privacy and compliance in regulated anonymous payment system based on blockchain

引用

Journal of Ambient Intelligence and Humanized Computing 2024年第8期15卷 3141-3157页

作者： Elfadul, Issameldeen Wu, Lijun Elhabob, Rashad Elkhalil, Ahmed School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China School of Information and Software Engineering University of Electronic Science and Technology of China Chengdu610054 China School of Computer and Information Engineering Qilu Institute of Technology Shandong Jinan250200 China Faculty of Computer Science and Information Technology Karary University Khartoum Sudan

Decentralized Anonymous Payment Systems (DAP), often known as cryptocurrencies, stand out as some of the most innovative and successful applications on the blockchain. These systems have garnered significant attention in the financial industry due to their highly secure and reliable features. Regrettably, the DAP system can be exploited to fund illegal activities such as drug dealing and terrorism. Therefore, governments are increasingly worried about the illicit use of DAP systems, which poses a critical threat to their security. This paper proposes Privacy and Compliance in Regulated Anonymous Payment System Based on Blockchain (PCRAP), which provides government supervision and enforces regulations over transactions without sacrificing the essential idea of the blockchain, that is, without surrendering transaction privacy or anonymity of the participants. The key characteristic of the proposed scheme is using a ring signature and stealth address to ensure the anonymity of both the sender and receiver of the transaction. Moreover, a Merkle Tree is used to guarantee government supervision and enforce regulations. Our proposed scheme satisfies most of the stringent security requirements and complies with the standards of secure payment systems. Additionally, while our work supports government regulations and supervision, it guarantees unconditional anonymity for users. Furthermore, the performance analysis demonstrates that our suggested scheme still remains applicable and effective even when achieving complete anonymity. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Blockchain

来源：评论

学校读者我要写书评

暂无评论

COVID-19 Pandemic: A Worldwide Critical Review with the Machine Learning Model-Based Prediction

引用

Journal of The Institution of Engineers (India): Series B 2025年第1期106卷 339-349页

作者： Misra, Neeraj Kumar Das, Sanchali Satpathy, Sambit Addula, Santosh Reddy Trivedi, Munesh Chandra School of Electronics Engineering VIT-AP University Andhra Pradesh Amaravathi522237 India School of Computer Science Engineering and Technology Bennett University Greater Noida India Computer Science and Engineering Galgotias College of Engineering and Technology Greater Noida India Information Technology University of the Cumberlands Williamsburg United States Computer Science and Engineering PSSCIVE Bhopal Bhopal India

Machine learning (ML) with data analysis has many successful applications and is widely employed daily. Additionally, they have played a significant role in combating the global coronavirus (COVID-19) outbreak. International occurrences of the COVID-19 pandemic have resulted from the rapid global spread of the SARS-CoV-2 virus. In this study, we examine the ML and data analysis techniques for diagnosis, treatment, and impact of COVID-19, which are based on artificial intelligence (AI). Moreover, we provide an overview of the current state of the art in AI-based machine learning and deep learning techniques as well as the datasets, tools, and performance of the tools that can be used to combat COVID-19. In this survey, we have attempted to provide a comprehensive overview of the most recent state-of-the-art approaches available to researchers in Mathematical and Statistical analysis and the larger medical community as a whole. It also includes information on how data and ML can be used to improve COVID-19 status and encourage further research to prevent COVID-19 outbreaks. Future directions and problems are also described in detail. © The Institution of Engineers (India) 2024.

关键词： COVID-19

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：