检索结果-内蒙古大学图书馆

International Conference on Wireless communications and Signal Processing (WCSP)

作者： Jiayue Liu Yan Zhang Xijun Wang Chao Xu Xiao Ma State Key Lab of Integrated Service Networks Information Science Institute Xidian University Xi'an China Science and Technology on Communication Network Laboratory Shijiazhuang China School of Electronics and Information Technology Sun Yat-sen University Guangzhou China Shaanxi Normal University Xi'an P. R. China

ISBN: (数字)9781728172361

ISBN: (纸本)9781728172378

In this paper, we study the path planning for autonomous inspection with multiple UAVs in a certain area to minimize the maximum flight distance of the UAV. Particularly, the UAVs are dispatched from the same depot to visit all inspection points, and finally return to the depot. Each inspection point is visited by only one UAV. Since the min-max path planning is NP-hard, we transform this problem by replacing the minimum Hamiltonian cycle length of each UAV with the average cycle length. Then, we decouple it into two subproblems, i.e., task allocation and trajectory design, and solve them respectively. Simulation results show that the proposed algorithm achieves better performance than conventional GA-mTSP method.

关键词： Inspection Trajectory Unmanned aerial vehicles Task analysis Partitioning algorithms Resource management Transforms

来源：评论

学校读者我要写书评

暂无评论

Terahertz Frequency Reconfigurable Slot Antenna Based on Graphene

Terahertz Frequency Reconfigurable Slot Antenna Based on Gra...

引用

Electronics, Circuits and information Engineering (ECIE), International Conference on

作者： Qinglin Wu Weiping Cao Qingyong Wang Yumei Luo School of Information and Communications Guilin University of Electronic Science and Technology Gui Lin China Guangxi Key Lab of Wireless Wideband Communication and Signal Processing School of Information and Communications Guilin University of Electronic Science and Technology Gui Lin China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic Technology Gui Lin China

ISBN: (数字)9798350388312

ISBN: (纸本)9798350388329

Toaddress the demands of high data rate transmission, multifunctionality, and miniaturization in modern communication devices, a novel design for a frequency-reconfigurable terahertz patch antenna is proposed using graphene. The antenna employs a coplanar waveguide feeding structure, which facilitates impedance matching. Three graphene patches are strategically placed and serve as tuning switches within the antenna gap. By controlling the conductivity of graphene, the effective length of the antenna is influenced, enabling frequency switching. The antenna achieves frequency reconfigurable within the 2.705- 3.569 THz frequency range, exhibits good impedance matching, with reflection coefficients all below -17 dB, and maintains a stable maximum radiation gain within $2.9-3.1 \mathrm{dBi}$.

关键词： Slot antennas Impedance matching Graphene Resonant frequency Terahertz radiation Switches Antennas

来源：评论

学校读者我要写书评

暂无评论

MISA: Unveiling the Vulnerabilities in Split Federated Learning

MISA: Unveiling the Vulnerabilities in Split Federated Learn...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Wei Wan Yuxuan Ning Shengshan Hu Lulu Xue Minghui Li Leo Yu Zhang Hai Jin School of Cyber Science and Engineering Huazhong University of Science and Technology National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Hubei Key Laboratory of Distributed System Security Hubei Engineering Research Center on Big Data Security School of Computer Science and Technology Huazhong University of Science and Technology School of Software Engineering Huazhong University of Science and Technology School of Information and Communication Technology Griffith University Cluster and Grid Computing Lab

Federated learning (FL) and split learning (SL) are prevailing distributed paradigms in recent years. They both enable shared global model training while keeping data localized on users’ devices. The former excels in parallel execution capabilities, while the latter enjoys low dependence on edge computing resources and strong privacy protection. Split federated learning (SFL) combines the strengths of both FL and SL, making it one of the most popular distributed architectures. Furthermore, a recent study has claimed that SFL exhibits robustness against poisoning attacks, with a fivefold improvement compared to FL in terms of *** this paper, we present a novel poisoning attack known as $\color{Fuchsia} {{\text{MISA}}}$. It poisons both the top and bottom models, causing a misalignment in the global model, ultimately leading to a drastic accuracy collapse. This attack unveils the vulnerabilities in SFL, challenging the conventional belief that SFL is robust against poisoning attacks. Extensive experiments demonstrate that our proposed MISA poses a significant threat to the availability of SFL, underscoring the imperative for academia and industry to accord this matter due attention.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Securely Fine-tuning Pre-trained Encoders Against Adversarial Examples

Securely Fine-tuning Pre-trained Encoders Against Adversaria...

引用

IEEE Symposium on Security and Privacy

作者： Ziqi Zhou Minghui Li Wei Liu Shengshan Hu Yechao Zhang Wei Wan Lulu Xue Leo Yu Zhang Dezhong Yao Hai Jin National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology School of Software Engineering Huazhong University of Science and Technology Hubei Engineering Research Center on Big Data Security Hubei Key Laboratory of Distributed System Security School of Cyber Science and Engineering Huazhong University of Science and Technology School of Information and Communication Technology Griffith University

ISBN: (数字)9798350331301

ISBN: (纸本)9798350331318

With the evolution of self-supervised learning, the pre-training paradigm has emerged as a predominant solution within the deep learning landscape. Model providers furnish pre-trained encoders designed to function as versatile feature extractors, enabling downstream users to harness the benefits of expansive models with minimal effort through fine-tuning. Nevertheless, recent works have exposed a vulnerability in pre-trained encoders, highlighting their susceptibility to downstream-agnostic adversarial examples (DAEs) meticulously crafted by attackers. The lingering question pertains to the feasibility of fortifying the robustness of downstream models against DAEs, particularly in scenarios where the pre-trained encoders are publicly accessible to the *** this paper, we initially delve into existing defensive mechanisms against adversarial examples within the pre-training paradigm. Our findings reveal that the failure of current defenses stems from the domain shift between pre-training data and downstream tasks, as well as the sensitivity of encoder parameters. In response to these challenges, we propose Genetic Evolution-Nurtured Adversarial Fine-tuning (Gen-AF), a two-stage adversarial fine-tuning approach aimed at enhancing the robustness of downstream models. Gen-AF employs a genetic-directed dual-track adversarial fine-tuning strategy in its first stage to effectively inherit the pre-trained encoder. This involves optimizing the pre-trained encoder and classifier separately while incorporating genetic regularization to preserve the model’s topology. In the second stage, Gen-AF assesses the robust sensitivity of each layer and creates a dictionary, based on which the top-k robust redundant layers are selected with the remaining layers held fixed. Upon this foundation, we conduct evolutionary adaptability fine-tuning to further enhance the model’s generalizability. Our extensive experiments, conducted across ten self-supervised training methods and six d

关键词： Training Adaptation models Sensitivity Accuracy Self-supervised learning Genetics Feature extraction

来源：评论

学校读者我要写书评

暂无评论

Signal Tensor Model and Eigenvalue Distributions for THz Uplink UM-MIMO communications

Signal Tensor Model and Eigenvalue Distributions for THz Upl...

引用

International Conference on Wireless communications and Signal Processing (WCSP)

作者： Bin Qi Wensheng Zhang Qiang Li Jian Sun Zhi Liu Chen Wang Cheng-Xiang Wang Shandong Provincial Key Lab of Wireless Communication Technologies School of Information Science and Engineering Shandong University Qingdao China School of Electronic Information and Communications Huazhong University of Science and Technology Wuhan China National Mobile Communications Research Laboratory School of Information Science and Engineering Southeast University Nanjing China Purple Mountain Laboratories Nanjing China

Tensor theory has been widely used in the research field of wireless communications. Tensor eigenvalues are usually considered key parameters of tensors. However, the exact physical or practical meanings of tensor eigenvalues in wireless communications are still unknown. In this paper, we investigate the distributions of tensor eigenvalues for Terahertz (THz) ultra-massive multiple-input multiple-output (UM-MIMO) orthogonal frequency division multiplexing (OFDM) systems, in which the channel modeling problem using hybrid beamforming (HBF) is studied, aiming to study the properties of tensor eigenvalues in communication systems. The OFDM pilot is sent by the mobile station (MS) through a precoder with random phases. The received signal at the base station (BS) can be reassembled into a fifth-order tensor that follows CANDECOMP/PARAFAC decomposition (CPD) to represent channel information. The homotopy method is used to calculate all eigenvalues of signal tensors efficiently and accurately. The numerical results show that the non-zero eigenvalues of received signal tensors are distributed sparsely, and the eigenvalue of each tensor is a unique value.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Why Does Little Robustness Help? A Further Step Towards Understanding Adversarial Transferability

Why Does Little Robustness Help? A Further Step Towards Unde...

引用

IEEE Symposium on Security and Privacy

作者： Yechao Zhang Shengshan Hu Leo Yu Zhang Junyu Shi Minghui Li Xiaogeng Liu Wei Wan Hai Jin National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Hubei Engineering Research Center on Big Data Security Hubei Key Laboratory of Distributed System Security School of Cyber Science and Engineering Huazhong University of Science and Technology School of Information and Communication Technology Griffith University School of Software Engineering Huazhong University of Science and Technology Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology

ISBN: (数字)9798350331301

ISBN: (纸本)9798350331318

Adversarial examples for deep neural networks (DNNs) are transferable: examples that successfully fool one white-box surrogate model can also deceive other black-box models with different architectures. Although a bunch of empirical studies have provided guidance on generating highly transferable adversarial examples, many of these findings fail to be well explained and even lead to confusing or inconsistent advice for practical *** this paper, we take a further step towards understanding adversarial transferability, with a particular focus on surrogate aspects. Starting from the intriguing "little robustness" phenomenon, where models adversarially trained with mildly perturbed adversarial samples can serve as better surrogates for transfer attacks, we attribute it to a trade-off between two dominant factors: model smoothness and gradient similarity. Our research focuses on their joint effects on transferability, rather than demonstrating the separate relationships alone. Through a combination of theoretical and empirical analyses, we hypothesize that the data distribution shift induced by off-manifold samples in adversarial training is the reason that impairs gradient *** on these insights, we further explore the impacts of prevalent data augmentation and gradient regularization on transferability and analyze how the trade-off manifests in various training methods, thus building a comprehensive blueprint for the regulation mechanisms behind transferability. Finally, we provide a general route for constructing superior surrogates to boost transferability, which optimizes both model smoothness and gradient similarity simultaneously, e.g., the combination of input gradient regularization and sharpness-aware minimization (SAM), validated by extensive experiments. In summary, we call for attention to the united impacts of these two factors for launching effective transfer attacks, rather than optimizing one while ignoring the other, and emphasize the

关键词： Training Privacy Buildings Closed box Minimization Data augmentation Robustness

来源：评论

学校读者我要写书评

暂无评论

An improved M-ary MC-CDMA for mobile communication systems

An improved M-ary MC-CDMA for mobile communication systems

引用

Asia-Pacific Radio science Conference

作者： Yanjun Hu Jinkang Zhu Dept. of Electronics Engineering & Information Science Anhui University. Hefei Anhui P.R.China Personal Communication Network & Spread Spectrum Laboratory University of Science and Technology Anhui China Personal Communication Network & Spread Spectrum Lab. University of Science and Technology of China. Hefei Anhui P. R. China

ISBN: (纸本)0780384040

The multi-carrier (MC) CDMA technique can reduce the interference and improve the performance of the system in fading channels. In this paper, to transmit high rate data, an improved novel M-ary MC-CDMA technique is proposed, which offers a much higher spectral efficiency. We give numerical results of the performance analysis and comparisons of conventional MC-CDMA schemes with the proposed M-ary MC-CDMA in an uplink channel with frequency-selective Rayleigh fading.

关键词： Multicarrier code division multiple access Mobile communication Multiaccess communication OFDM Interference Fading Transmitters Frequency domain analysis information science Rayleigh channels

来源：评论

学校读者我要写书评

暂无评论

Generative Adversarial Network-based Channel Modeling for Free-Space Optical communication

Generative Adversarial Network-based Channel Modeling for Fr...

引用

OptoElectronics and communications Conference, OECC

作者： Wenbin Chen Danshi Wang Dongdong Wang Yuchen Song Jin Li Min Zhang State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Science and Technology on Communication Networks Laboratory Shijiazhuang China The 54th Research Institute of China Electronics Technology Group Corporation Shijiazhuang China Purple Mountain Lab Nanjing China

Two deep learning-based differentiable models based on GAN and BiLSTM are proposed for FSO channel modeling. Through contrastive analysis, it shows that GAN is more suitable for learning FSO channel distribution with ... 详细信息

ISBN: (数字)9781943580927

ISBN: (纸本)9781665400060

关键词： Wireless communication Analytical models Free-space optical communication Stochastic processes Generative adversarial networks Channel models

来源：评论

学校读者我要写书评

暂无评论

The reliability-enhanced wireless networks through BATS codes

The reliability-enhanced wireless networks through BATS code...

引用

IEEE International Symposium on Consumer Electronics (ISCE)

作者： Xiaoping Dong Yu Zhang Jian Song Hang Zhang Department of Electronic Engineering National Engineering Lab. for DTV Beijing P. R. China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory Shijiazhuang P.R. China

Network coding (NC) is a promising method used to achieve the channel capacity and enhance the reliability of multicast networks. However, the general wireless multicast networks based on NC are facing big problems such as long delays and large computational complexities. We propose a multicast network based on Batched sparse (BATS) codes which can efficiently solve these problems. Since fountain codes can also improve the reliability of wireless networks. We thoroughly compare the performance of BATS codes with that of fountain codes under our proposed networks. Simulation findings indicate that the proposed scheme results in much less transmission delay with minor complexity loss compared to fountain codes. Through analysis and simulation, we demonstrate that BATS codes perform much better than digital fountain codes in the aspects of throughput and overhead at the transmitter. It is also further shown that BATS codes are more robust against high packet loss.

关键词： Throughput Reliability Encoding Complexity theory Decoding Network coding Wireless communication

来源：评论

学校读者我要写书评

暂无评论

Device-independent quantum secure direct communication against collective attacks

引用

science Bulletin 2020年第1期65卷 12-20,M0003页

作者： Lan Zhou Yu-Bo Sheng Gui-Lu Long School of Science Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China State Key Laboratory of Low-dimensional Quantum Physics Beijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China

"Device-independent"not only represents a relaxation of the security assumptions about the internal working of the quantum devices,but also can enhance the security of the quantum *** the paper,we put forward the first device-independent quantum secure direct communication(DIQSDC)protocol and analyze its security and communication efficiency against collective *** practical noisy quantum channel condition,the photon transmission loss and photon state decoherence would reduce DI-QSDC’s communication quality and threaten its absolute *** solving the photon transmission loss and decoherence problems,we adopt noiseless linear amplification(NLA)protocol and entanglement purification protocol(EPP)to modify the DI-QSDC *** the help of the NLA and EPP,we can guarantee DI-QSDC’s absolute security and effectively improve its communication quality.

关键词： Quantum cryptography Device-independent quantum secure direct communication information security communication efficiency

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：