检索结果-内蒙古大学图书馆

arXiv 2023年

作者： Gavras, Ioannis Islam, Md Atiqul Smida, Besma Alexandropoulos, George C. Department of Informatics and Telecommunications National and Kapodistrian University of Athens Greece Qualcomm Technologies Inc. Santa ClaraCA United States Department of Electrical and Computer Engineering University of Illinois Chicago United States

This paper presents an in-band Full Duplex (FD) integrated sensing and communications system comprising a holographic Multiple-Input Multiple-Output (MIMO) base station, which is capable to simultaneously communicate with multiple users in the downlink direction, while sensing targets being randomly distributed within its coverage area. Considering near-field wireless operation at THz frequencies, the FD node adopts dynamic metasurface antenna panels for both transmission and reception, which consist of massive numbers of sub-wavelength-spaced metamaterials, enabling reduced cost and power consumption analog precoding and combining. We devise an optimization framework for the FD node’s reconfigurable parameters with the dual objective of maximizing the targets’ parameters estimation accuracy and the downlink communication performance. Our simulation results verify the integrated sensing and communications capability of the proposed FD holographic MIMO system, showcasing the interplays among its various design parameters. © 2023, CC BY-NC-ND.

关键词： MIMO systems

来源：评论

学校读者我要写书评

暂无评论

The influence of MIMO terminal user's hand on channel capacity

The influence of MIMO terminal user's hand on channel capaci...

引用

European Conference on Antennas and Propagation, EuCAP

作者： T. Zervos A. Alexandridis K. Peppas F. Lazarakis K. Dangakis C. Soras B. Lindmark Department of Electrical & Computer Engineering University of Patras Patras Greece Institute of Informatics & Telecommunications National Centre for Scientific Research Athens Greece Department of Signals Sensors and Systems Royal Institute of Technology Stockholm Sweden

In this paper the impact of user's hand holding a multiple-input-multiple-output (MIMO) terminal on the system performance is investigated. A 4times4 MIMO system is considered with a personal digital assistant (PDA) terminal equipped with a compact array of 4 patch elements. The radiation patterns of the antenna elements are simulated in the presence of the other elements and in the presence of a user's hand. The obtained patterns are used to evaluate the covariance matrix of the receive antenna which is incorporated in a correlation-based MIMO channel model. MIMO channel capacity is calculated to demonstrate the capacity degradation caused by the user's hand.

关键词： MIMO Channel capacity Personal digital assistants Antenna radiation patterns Mobile antennas System performance Impedance Biological tissues Humans Frequency

来源：评论

学校读者我要写书评

暂无评论

Performance Improvements of Vehicular PKI Protocol for the Security of V2X Communications

Performance Improvements of Vehicular PKI Protocol for the S...

引用

International Conference on Telecommunications and Signal Processing (TSP)

作者： Hassan Farran David Khoury Department of Networked Systems and Services Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Budapest Hungary Department of Computer Science and Information and Communication Technology American University of Science and Technology Beirut Lebanon

Vehicle-to-Everything (V2X) technology allows vehicles to communicate with numerous transportation system components. To provide safe communication between vehicles and other entities, V2X depends on Public Key Infrastructure (PKI). However, the present PKI employed in V2X has certain drawbacks, including scalability and high computational cost. This article offers an enhancement to the current PKI in V2X that tackles these constraints by managing and distributing keys using blockchain technology. The suggested Public Key Infrastructure enhancement is intended to be secure, efficient, and scalable, providing a more solid and trustworthy foundation for V2Xcommunication. The article explains the suggested PKI enhancement and examines its advantages and disadvantages. Overall, the suggested Public Key Infrastructure enhancement has the potential to increase the security and dependability of Vehicle-to-Everything communication, allowing for a secure and more effective transportation system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Sub-Goal Social Force Model for Collective Pedestrian Motion Under Vehicle Influence

arXiv

引用

arXiv 2021年

作者： Yang, Dongfang Johora, Fatema T. Redmill, Keith A. Özgüner, Ümit Müller, Jörg P. Department of Electrical and Computer Engineering The Ohio State University ColumbusOH43212 United States Department of Informatics Clausthal University of Technology Julius-Albert-Str. 4 Clausthal-Zellerfeld38678 Germany

—In mixed traffic scenarios, a certain number of pedestrians might coexist in a small area while interacting with vehicles. In this situation, every pedestrian must simultaneously react to the surrounding pedestrians and vehicles. Analytical modeling of such collective pedestrian motion can benefit intelligent transportation practices like shared space design and urban autonomous driving. This work proposed the sub-goal social force model (SG-SFM) to describe the collective pedestrian motion under vehicle influence. The proposed model introduced a new design of vehicle influence on pedestrian motion, which was smoothly combined with the influence of surrounding pedestrians using the sub-goal concept. This model aims to describe generalized pedestrian motion, i.e., it is applicable to various vehicle-pedestrian interaction patterns. The generalization was verified by both quantitative and qualitative evaluation. The quantitative evaluation was conducted to reproduce pedestrian motion in three different datasets, HBS, CITR, and DUT. It also compared two different ways of calibrating the model parameters. The qualitative evaluation examined the simulation of collective pedestrian motion in a series of fundamental vehicle-pedestrian interaction scenarios. The above evaluation results demonstrated the effectiveness of the proposed model. Copyright © 2021, The Authors. All rights reserved.

关键词： Vehicles

来源：评论

学校读者我要写书评

暂无评论

Unsupervised Foggy Scene Understanding via Self Spatial-Temporal Label Diffusion

arXiv

引用

arXiv 2022年

作者： Liao, Liang Chen, Wenyi Xiao, Jing Wang, Zheng Lin, Chia-Wen Satoh, Shin'ichi The Digital Content and Media Sciences Research Division National Institute of Informatics Tokyo101-8430 Japan The School of Computer Science Wuhan University Wuhan430072 China The Department of Electrical Engineering The Institute of Communications Engineering National Tsing Hua University Hsinchu30013 Taiwan

Understanding foggy image sequence in driving scene is critical for autonomous driving, but it remains a challenging task due to the difficulty in collecting and annotating real-world images of adverse weather. Recently, self-training strategy has been considered as a powerful solution for unsupervised domain adaptation, which iteratively adapts the model from the source domain to the target domain by generating target pseudo labels and re-training the model. However, the selection of confident pseudo labels inevitably suffers from the conflict between sparsity and accuracy, both of which will lead to suboptimal models. To tackle this problem, we exploit the characteristics of the foggy image sequence of driving scenes to densify the confident pseudo labels. Specifically, based on the two discoveries of local spatial similarity and adjacent temporal correspondence of the sequential image data, we propose a novel Target-Domain driven pseudo label Diffusion (TDo-Dif) scheme. It employs superpixels and optical flows to identify the spatial similarity and temporal correspondence, respectively, and then diffuses the confident but sparse pseudo labels within a superpixel or a temporal corresponding pair linked by the flow. Moreover, to ensure the feature similarity of the diffused pixels, we introduce local spatial similarity loss and temporal contrastive loss in the model re-training stage. Experimental results show that our TDo-Dif scheme helps the adaptive model achieve 51.92% and 53.84% mean intersection-over-union (mIoU) on two publicly available natural foggy datasets (Foggy Zurich and Foggy Driving), which exceeds the state-of-the-art unsupervised domain adaptive semantic segmentation methods. The proposed method can also be applied to non-sequential images in the target domain by considering only spatial similarity. Models and data can be found at https://***/velor2012/TDo-Dif. Copyright © 2022, The Authors. All rights reserved.

关键词： Diffusion

来源：评论

学校读者我要写书评

暂无评论

Modified Bow-Tie Antenna Design Using Artificial Hummingbird Algorithm for Wireless Power Transfer IoT Applications

Modified Bow-Tie Antenna Design Using Artificial Hummingbird...

引用

European Conference on Antennas and Propagation, EuCAP

作者： Achilles D. Boursianis Maria S. Papadopoulou Aikaterini I. Griva Vasileios P. Rekkas Lazaros A. Iliadis Sotirios P. Sotiroudis Panagiotis Diamantoulakis Thomas Lagkas Panagiotis Sarigiannidis Sotirios K. Goudos Christos Christodoulou George K. Karagiannidis ELEDIA@AUTH School of Physics Aristotle University of Thessaloniki Thessaloniki Greece ELEDIA@AUTH Department of Information and Electronic Engineering International Hellenic University Sindos Greece Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece Department of Computer Science International Hellenic University Kavala Greece Department of Informatics and Telecommunications Engineering University of Western Macedonia Kozani Greece Department of Engineering and Computing The University of New Mexico USA

The advent of the Internet of Things has allowed the re-usability of established techniques combined with emerging technologies. In the TERMINET project, several key-enabling technologies in an IoT ecosystem are explored. The smart farming paradigm is one of the realistic use cases of the project, in which Wireless Power Transfer, assisted by an Unmanned Aerial Vehicle, will be demonstrated as a proof-of-concept, to deliver energy in wireless sensor networks. In this work, we provide a feasible solution of a rectifying antenna module in a rectenna system, which operates in the Wi-Fi 2.4 GHz frequency band. The proposed antenna is optimized by utilizing the Artificial Hummingbird Algorithm. Numerical results demonstrate excellent performance of the proposed antenna, in terms of the key characteristics of reflection coefficient, input impedance, realized gain, and efficiency.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Integrated Learning in electrical and Control engineering Using an Educational Elevator System

Integrated Learning in Electrical and Control Engineering Us...

引用

International Conference and Exposition on electrical and Power engineering (EPE)

作者： Dorin-Dumitru Lucache Georgel Gabor Constantin-Cătălin Dosoftei Faculty of Electrical Eng. Energy and Applied Informatics “Gheorghe Asachi” Technical University of Iasi Iasi Romania Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iasi Iasi Romania

ISBN: (数字)9781728181264

ISBN: (纸本)9781728181271

The research of the authors is focused on presenting a practical multidisciplinary experiment - an elevator simulator to relate theory and practice inside of a lot of disciplines and to bring the “real world” into a useful case study for electrical and control engineering education. Through the existence of interesting experiments, students gain motivation either to continue thinking and improving new solutions for building and control of elevators. The concept of the modern elevator is presented in this paper from the perspective of integration of current technological equipment like a programmable logic controller, inverter, encoder, human-machine-interface on which students can develop various control strategies using a SCADA system. The paper presents the some exercises that students can perform on the existent simulator.

关键词： Elevators Registers Induction motors Software Coils Traction motors Inverters

来源：评论

学校读者我要写书评

暂无评论

Enterprise Architecture Trends in the Digital Transformation Era

Enterprise Architecture Trends in the Digital Transformation...

引用

International Seminar on Application for Technology of Information and Communication (ISemantic)

作者： Irfan Mahendra Ford Lumban Gaol Suhono Harso Supangkat Benny Ranti Computer Science Bina Nusantara University Jakarta Indonesia Faculty of Information Technology Nusa Mandiri University Jakarta Indonesia School of Electrical Engineering and Informatics Bandung Institute of Technology Bandung Indonesia Faculty of Computer Science University of Indonesia Jakarta Indonesia

Enterprise Architecture (EA) is a solution to build alignment between business strategy and information technology in dealing with digital transformation that causes fundamental changes for companies and businesses. The purpose of this study is to examine the trends and progress of EA in responding to the challenges of the digital transformation era, which is carried out through SLRs using the PRISMA method. According to the research findings, implementing EA in businesses serves the following purposes: establishing clear objectives and strategies for the development of business and technology, achieving harmony between business and information technology, time and cost efficiency, and effectiveness in business development processes and information technology. Then, it was concluded that there are nine components of EA, namely, vision, mission, and strategic objectives; business architecture; data & information architecture; information system architecture; infrastructure and network architecture; security architecture; human resources architecture; governance, legal, and compliance; and standards & regulations.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Meta-transfer learning through hard tasks

arXiv

引用

arXiv 2019年

作者： Sun, Qianru Liu, Yaoyao Chen, Zhaozheng Chua, Tat-Seng Schiele, Bernt School of Information Systems Singapore Management University School of Electrical and Information Engineering Tianjin University School of Computing National University of Singapore Department of Computer Vision and Machine Learning Max-Plank Institute for Informatics

Meta-learning has been proposed as a framework to address the challenging few-shot learning setting. The key idea is to leverage a large number of similar few-shot tasks in order to learn how to adapt a base-learner to a new task for which only a few labeled samples are available. As deep neural networks (DNNs) tend to overfit using a few samples only, typical meta-learning models use shallow neural networks, thus limiting its effectiveness. In order to achieve top performance, some recent works tried to use the DNNs pre-trained on large-scale datasets but mostly in straight-forward manners, e.g., (1) taking their weights as a warm start of meta-training, and (2) freezing their convolutional layers as the feature extractor of base-learners. In this paper, we propose a novel approach called meta-transfer learning (MTL) which learns to transfer the weights of a deep NN for few-shot learning tasks. Specifically, meta refers to training multiple tasks, and transfer is achieved by learning scaling and shifting functions of DNN weights for each task. In addition, we introduce the hard task (HT) meta-batch scheme as an effective learning curriculum that further boosts the learning efficiency of MTL. We conduct few-shot learning experiments and report top performance for five-class few-shot recognition tasks on three challenging benchmarks: miniImageNet, tieredImageNet and Fewshot-CIFAR100 (FC100). Extensive comparisons to related works validate that our MTL approach trained with the proposed HT meta-batch scheme achieves top performance. An ablation study also shows that both components contribute to fast convergence and high accuracy. Compared to the conference version of the paper [1], this version additionally presents (1) the analysis of using different DNN architectures, e.g., ResNet-12, ResNet-18 and ResNet-25;(2) the new MTL variants that adapt our scaling and shifting functions to the classical supervised and the state-of-the-art semi-supervised meta-learners, and

关键词： Deep neural networks

来源：评论

学校读者我要写书评

暂无评论

Cognitive Complexity of Software and Its Measurement

Cognitive Complexity of Software and Its Measurement

引用

Firth IEEE International Conference on Cognitive informatics(第五届认知信息国际会议)

作者： Yingxu Wang International Center for Cognitive Informatics (ICfCI) Dept of Electrical and Computer Engineering University of Calgary 2500 University Drive NW Calgary Alberta Canada T2N 1N4

ISBN: (纸本)1424404754;9781424404759

The estimation and measurement of functional complexity of software are an age-long problem in software engineering. The cognitive complexity of software presented in this paper is a new measurement for cross-platform analysis of complexities, sizes, and comprehension effort of software specifications and implementations in the phases of design, implementation, and maintenance in software engineering. This paper reveals that the cognitive complexity of software is a product of its architectural and operational complexities on the basis of deductive semantics and the abstract system theory. Ten fundamental basic control structures (BCS's) are elicited from software architectural and behavioral specifications and descriptions. The cognitive weights of those BCS's are derived and calibrated via a series of psychological experiments. Based on mis work, the cognitive complexity of software systems can be rigorously and accurately measured and analyzed Comparative case studies demonstrate that the cognitive complexity is highly distinguishable in software functional complexity and size measurement in software engineering.

关键词： Cognitive informatics software engineering BCS cognitive weights cognitive complexity psychological experiments calibrated weights cognitive functional size.

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：