检索结果-内蒙古大学图书馆

Estimation of the Minimum Backflashover Current and Backflashover Rate of a 150 kV Overhead Transmission Line: Frequency and Current-Dependent Effects of Grounding systems

Estimation of the Minimum Backflashover Current and Backflas...

引用

International Conference on Environment and electrical engineering (EEEIC)

作者： Zacharias G. Datsios Erika Stracqualursi Rodolfo Araneo Pantelis N. Mikropoulos Thomas E. Tsovilis High Voltage Laboratory School of Electrical &#x0026 Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece Department of Astronautical Electrical and Energy Engineering University of Rome &#x201C Sapienza&#x201D Rome Italy

ISBN: (数字)9781665485371

ISBN: (纸本)9781665485388

Frequency- and current-dependent effects dominate the response of grounding systems. This work investigates the influence of tower grounding system modeling on estimating the minimum backflashover current and backflashover rate (BFR) of a typical 150 kV overhead transmission line. The minimum backflashover current is determined through ATP-EMTP simulations. Four grounding system modeling approaches are evaluated, namely: (i) a constant ground resistance, (ii) the frequency-dependent (FD) response of the grounding system with constant electrical properties of soil, (iii) the FD response with FD soil properties, and (iv) a soil ionization model. Actual concentrated and extended tower grounding systems used in practice for the investigated 150 kV line are considered. The FD response of these grounding systems is obtained using a hybrid code based on electromagnetic field analysis and circuit theory. Results show that simulating the FD response is important for the extended grounding system. For the concentrated grounding system, the minimum backflashover current and BFR are affected considerably by including soil ionization in simulations; FD effects influence BFR results primarily for low soil resistivity values.

关键词： Resistance Power transmission lines Grounding Poles and towers Ionization Soil properties Conductivity

来源：评论

学校读者我要写书评

暂无评论

Attention-aware Resource Allocation and QoE Analysis for Metaverse xURLLC Services

arXiv

引用

arXiv 2022年

作者： Du, Hongyang Liu, Jiazhen Niyato, Dusit Kang, Jiawen Xiong, Zehui Zhang, Junshan Kim, Dong In The School of Computer Science and Engineering Nanyang Technological University Singapore The School of Information Renmin University of China China The School of Automation Guangdong University of Technology China The Pillar of Information Systems Technology and Design Singapore University of Technology and Design Singapore The Department of Electrical and Computer Engineering University of California Davis United States The Department of Electrical and Computer Engineering Sungkyunkwan University Korea Republic of

Metaverse encapsulates our expectations of the next-generation Internet, while bringing new key performance indicators (KPIs). Although conventional ultra-reliable and low-latency communications (URLLC) can satisfy objective KPIs, it is difficult to provide a personalized immersive experience that is a distinctive feature of the Metaverse. Since the quality of experience (QoE) can be regarded as a comprehensive KPI, the URLLC is evolved towards the next generation URLLC (xURLLC) with a personalized resource allocation scheme to achieve higher QoE. To deploy Metaverse xURLLC services, we study the interaction between the Metaverse service provider (MSP) and the network infrastructure provider (InP), and provide an optimal contract design framework. Specifically, the utility of the MSP, defined as a function of Metaverse users' QoE, is to be maximized, while ensuring the incentives of the InP. To model the QoE mathematically, we propose a novel metric named Meta-Immersion that incorporates both the objective KPIs and subjective feelings of Metaverse users. Furthermore, we develop an attention-aware rendering capacity allocation scheme to improve QoE in xURLLC. Using a user-object-attention level dataset, we validate that the xURLLC can achieve an average of 20.1% QoE improvement compared to the conventional URLLC with a uniform resource allocation scheme. The code for this paper is available at https://***/HongyangDu/AttentionQoE. © 2022, CC BY.

关键词： Resource allocation

来源：评论

学校读者我要写书评

暂无评论

A Low-overhead PUF-based Secure Scan Design

A Low-overhead PUF-based Secure Scan Design

引用

IEEE International Symposium on Quality Electronic Design

作者： Wei Zhou Aijiao Cui Cassi Chen Gang Qu School of Electronic and Information Engineering Harbin Institute of Technology (Shenzhen) Guangdong China University of California Berkeley USA Dept. of Electrical and Computer Engineering and Institute of Systems Research Univ. of Maryland College Park USA

Scan-based side-channel attacks have become a severe threat to the security of cryptographic chips and locking mechanisms are one of the most effective methods against these attacks. However, securing the test key that locks the scan but must be shared among test engineers arises as a new challenge. In this paper, we solve this challenge by adopting the physical unclonable function (PUF) design to generate test keys that are unique for each chip. A one-time programming structure (OTPS) is used when the PUF response is first generated to improve its reliability. The security of the PUF response is achieved by obfuscation such that it can be retrieved only when a specific validation test vector presents. We implement the proposed secure scan design by reusing the original scan chain to reduce overhead. We demonstrate that the proposed secure scan design can protect the crypto chips against all existing scan-based side-channel attacks while incurring negligibly low overhead.

关键词： Side-channel attacks Resists Programming Physical unclonable function Reliability engineering Silicon Registers

来源：评论

学校读者我要写书评

暂无评论

Energy Minimization for Wireless Powered Data Offloading in IRS-assisted MEC for Vehicular Networks

Energy Minimization for Wireless Powered Data Offloading in ...

引用

International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Yuanzheng Tan Yusi Long Songhan Zhao Shimin Gong Dinh Thai Hoang Dusit Niyato School of Intelligent Systems Engineering Sun Yat-sen University China School of Electrical Engineering Yanshan University China Guangdong Provincial Key Laboratory of Fire Science and Intelligent Emergency Technology China School of Electrical and Data Engineering University of Technology Sydney Australia School of Computer Science and Engineering Nanyang Technological University Singapore

In this paper, we consider an IRS-assisted and wireless-powered mobile edge computing (MEC) system that allows both edge users and the IRS to harvest energy from the hybrid access point (HAP), co-located with the MEC server. Each edge user uses the harvested energy to offload its data to the MEC server. The IRS not only assists downlink energy transfer to the edge users, but also improves the users' uplink offloading rates. To minimize the overall energy consumption, we jointly optimize the users' offloading decisions, the HAP's active beamforming, as well as the IRS's energy harvesting and passive beamforming strategies. The energy minimization problem is intractable due to complicated couplings in both the objective function and constraints. We decompose this problem into the downlink energy transfer and the uplink data offloading phases. The uplink phase can be efficiently optimized by the conventional semi-definite relaxation (SDR) method, while the downlink phase depends on the alternating optimization between the users' offloading decisions and the joint active and passive beamforming strategies. Numerical results demonstrate that the proposed offloading scheme can significantly reduce the HAP's energy consumption compared with typical benchmarks.

关键词： Wireless communication Energy consumption Array signal processing Energy exchange Minimization Downlink Servers

来源：评论

学校读者我要写书评

暂无评论

Co‑packaged optics(CPO):status,challenges,and solutions

引用

Frontiers of Optoelectronics 2023年第1期16卷 1-40页

作者： Min Tan Jiang Xu Siyang Liu Junbo Feng Hua Zhang Chaonan Yao Shixi Chen Hangyu Guo Gengshi Han Zhanhao Wen Bao Chen Yu He Xuqiang Zheng Da Ming Yaowen Tu Qiang Fu Nan Qi Dan Li Li Geng Song Wen Fenghe Yang Huimin He Fengman Liu Haiyun Xue Yuhang Wang Ciyuan Qiu Guangcan Mi Yanbo Li Tianhai Chang Mingche Lai Luo Zhang Qinfen Hao Mengyuan Qin School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyHong KongChina HKUST Fok Ying Tung Research Institute Guangzhou 511462China The Hong Kong University of Science and Technology(Guangzhou) Guangzhou 511462China Chongqing United Micro-Electronics Center(CUMEC) Chongqing 401332China Hisense Broadband Multimedia Technologies Co. Ltd.Qingdao 266000China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Microelectronics Xi’an Jiaotong UniversityXi’an 710049China Zhangjiang Laboratory Shanghai 201210China The State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Huawei Technologies Co. Ltd.Shenzhen 440307China College of Computer National University of Defense TechnologyChangsha 410073China Institute of Computing Technology Chinese Academy of SciencesBeijing 100086China

Due to the rise of 5G,IoT,AI,and high-performance computing applications,datacenter trafc has grown at a compound annual growth rate of nearly 30%.Furthermore,nearly three-fourths of the datacenter trafc resides within *** conventional pluggable optics increases at a much slower rate than that of datacenter *** gap between application requirements and the capability of conventional pluggable optics keeps increasing,a trend that is *** optics(CPO)is a disruptive approach to increasing the interconnecting bandwidth density and energy efciency by dramatically shortening the electrical link length through advanced packaging and co-optimization of electronics and *** is widely regarded as a promising solution for future datacenter interconnections,and silicon platform is the most promising platform for large-scale *** international companies(e.g.,Intel,Broadcom and IBM)have heavily investigated in CPO technology,an inter-disciplinary research feld that involves photonic devices,integrated circuits design,packaging,photonic device modeling,electronic-photonic co-simulation,applications,and *** review aims to provide the readers a comprehensive overview of the state-of-the-art progress of CPO in silicon platform,identify the key challenges,and point out the potential solutions,hoping to encourage collaboration between diferent research felds to accelerate the development of CPO technology.

关键词： Co-packaged optics Silicon photonics High-performance computing Advanced packaging External laser Optical power delivery Co-simulation Standardization Transmitter Receiver

来源：评论

学校读者我要写书评

暂无评论

On Integral-Based (Transfinite) Laplace Coordinates 10th

On Integral-Based (Transfinite) Laplace Coordinates

引用

10th International Conference on Numerical Geometry, Grid Generation, and Scientific Computing celebrating the 130th anniversary of B. N. Delaunay, NUMGRID 2020

作者： Belyaev, Alexander G. Fayolle, Pierre-Alain Institute of Sensors Signals and Systems School of Engineering & Physical Sciences Heriot-Watt University Edinburgh United Kingdom Computer Graphics Laboratory University of Aizu Aizu-Wakamatsu Japan

ISBN: (纸本)9783030767976

In this theoretical work, we analyze general constructions for integral-based (transfinite, continuous) barycentric coordinates and consider a simple variational principle to arrive at a continuous version of the Laplace barycentric coordinates. We demonstrate how our approach leads to a general description of the integral-based barycentric coordinates and establish links with Dirichlet energy minimization problems for conical surfaces. Both the 2D and 3D cases are studied. An application to a surface generation problem is briefly considered. © 2021, Springer Nature Switzerland AG.

关键词： Laplace transforms

来源：评论

学校读者我要写书评

暂无评论

Screening cognitive impairment in patients with atrial fibrillation: A deep learning model based on retinal fundus photographs

引用

Heart Rhythm O2 2025年第5期6卷 678-686页

作者： Wang, Zhen Li, Mingxiao Xia, Peng Jiang, Chao Shen, Ting Ma, Jiaming Bai, Yu Zhang, Suhui Lai, Yiwei Li, Sitong Xu, Hui Xu, Yang Ma, Tong Ju, Lie He, Liu Dong, Li Sang, Caihua Long, Deyong Chen, Yuzhong Du, Xin Ge, Zongyuan Dong, Jianzeng Wei, Wen-Bin Ma, Changsheng Department of Cardiology Beijing Anzhen Hospital Capital Medical University Beijing China Engineering Research Center of Medical Devices for Cardiovascular Diseases Ministry of Education Capital Medical University Beijing China National Clinical Research Center for Cardiovascular Diseases Beijing China Beijing Airdoc Technology Co. Ltd. Beijing China Department of Electrical and Computer Systems Engineering Faculty of Engineering Monash University Clayton Australia Yale School of Medicine New Haven Connecticut United States School of Clinical Medicine Peking Union Medical College and Chinese Academy of Medical Science Beijing China Beijing Tongren Eye Center Beijing Key Laboratory of Intraocular Tumor Diagnosis and Treatment Beijing Ophthalmology & Visual Sciences Key Lab Medical Artificial Intelligence Research and Verification Key Laboratory of the Ministry of Industry and Information Technology Beijing Tongren Hospital Capital Medical University Beijing China Monash e-Research Center Monash University Clayton Australia

Background: Patients with atrial fibrillation (AF) have a higher risk of cognitive impairment (CI). However, complexity of CI diagnosis and lack of simple screening approaches limited early screening and intervention of CI in AF patients. Objective: Our study aimed to develop deep learning models based on fundus photographs for easy screening of CI in AF patients. Methods: From May 2021 to April 2023, patients who completed fundus examination and cognitive function evaluation in the Chinese Atrial Fibrillation Registry Study were included. The training and validation sets were randomly split at an 8:2 ratio. Participants from the Beijing Eye Study served as the external validation set. Different deep learning models were trained, and their CI detection ability was validated. Results: A total of 899 patients in the Chinese Atrial Fibrillation Registry Study were included. In the validation set, the vision-ensemble model based on fundus images alone had an area under the receiver-operating characteristic curve (AUROC) of 0.855 (95% confidence interval 0.816–0.894) for CI screening. The multimodal model (AUROC 0.861, 95% confidence interval 0.823–0.898), based on fundus photographs and 4 clinical variables, performed comparably to the vision-ensemble model. The AUROC of the vision-ensemble model for CI screening achieved 0.773 (95% confidence interval 0.709–0.837) in the external test set. In the saliency map, the vision-ensemble model focused on areas around retinal vessels and the optic disc. Conclusion: A vision-ensemble model based on fundus images might be practical for preliminary screening of CI in AF patients. © 2025 Heart Rhythm Society

关键词： Artificial intelligence Atrial fibrillation Cognitive impairment Deep learning Fundus photography

来源：评论

学校读者我要写书评

暂无评论

Wireless Communication with Flexible Reflector: Joint Placement and Rotation Optimization for Coverage Enhancement

arXiv

引用

arXiv 2024年

作者： Lu, Haiquan Yu, Zhi Zeng, Yong Ma, Shaodan Jin, Shi Zhang, Rui The National Mobile Communications Research Laboratory Frontiers Science Center for Mobile Information Communication and Security Southeast University Nanjing210096 China The Purple Mountain Laboratories Nanjing211111 China The State Key Laboratory of Internet of Things for Smart City The Department of Electrical and Computer Engineering University of Macau China School of Science and Engineering Shenzhen Research Institute of Big Data The Chinese University of Hong Kong Guangdong Shenzhen518172 China The Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore

Passive metal reflectors for communication enhancement have appealing advantages such as ultra low cost, zero energy expenditure, maintenance-free operation, long life span, and full compatibility with legacy wireless systems. To unleash the full potential of passive reflectors for wireless communications, this paper proposes a new passive reflector architecture, termed flexible reflector (FR), for enabling the flexible adjustment of beamforming direction via the FR placement and rotation optimization. We consider the multi-FR aided area coverage enhancement and aim to maximize the minimum expected receive power over all locations within the target coverage area, by jointly optimizing the placement positions and rotation angles of multiple FRs. To gain useful insights, the special case of movable reflector (MR) with fixed rotation is first studied to maximize the expected receive power at a target location, where the optimal single-MR placement positions for electrically large and small reflectors are derived in closed-form, respectively. It is shown that the reflector should be placed at the specular reflection point for electrically large reflector. While for area coverage enhancement, the optimal placement is obtained for the single-MR case and a sequential placement algorithm is proposed for the multi-MR case. Moreover, for the general case of FR, joint placement and rotation design is considered for the single-/multiFR aided coverage enhancement, respectively. Numerical results are presented which demonstrate significant performance gains of FRs over various benchmark schemes under different practical setups in terms of receive power enhancement. Copyright © 2024, The Authors. All rights reserved.

关键词： Benchmarking

来源：评论

学校读者我要写书评

暂无评论

Optical data transmission using inverse-designed silicon multimode photonic circuits and spectrally flattened microcombs

Optical data transmission using inverse-designed silicon mul...

引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Yang, K.Y. Shirpurkar, C. White, A.D. Zang, J. Chang, L. Ashtiani, F. Guidry, M.A. Lukin, D.M. Pericherla, S.V. Yang, J. Kwon, H. Lu, J. Ahn, G.H. Van Gasse, K. Jin, Y. Yu, S.-P. Briles, T.C. Stone, J.R. Carlson, D.R. Song, H. Zou, K. Zhou, H. Pang, K. Hao, H. Trask, L. Li, M. Netherton, A. Rechtman, L. Stone, J.S. Skarda, J.L. Su, L. Vercruysse, D. MacLean, J.P.W. Aghaeimeibodi, S. Li, M.-J. Miller, D.A.B. Marom, D.M. Willner, A.E. Bowers, J.E. Papp, S.B. Delfyett, P.J. Aflatouni, F. Vučković, J. E.L.Ginzton Laboratory Stanford University StanfordCA United States John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA United States The College of Optics and Photonics University of Central Florida OrlandoFL United States Time and Frequency Division National Institute of Standards and Technology BoulderCO United States Department of Physics University of Colorado BoulderCO United States Department of Electrical and Computer Engineering University of California Santa BarbaraCA United States Department of Electrical and Systems Engineering University of Pennsylvania PhiladelphiaPA United States SPINS Photonics Incorporated HollisterCA United States Octave Photonics LouisvilleCO United States Department of Electrical and Computer Engineering University of Southern California Los AngelesCA United States Applied Physics Department The Hebrew University of Jerusalem Jerusalem Israel Corning Incorporated CorningNY United States

We demonstrate a 1.12-Tbps error-free data transmission throughout inverse-designed multimode photonic circuits using spectrally flattened microcombs as a multiwavelength laser source. © Optica Publishing Group 2... 详细信息

ISBN: (纸本)9781957171258

关键词： Timing circuits

来源：评论

学校读者我要写书评

暂无评论

Tracking-Differentiator-Based Sliding-Mode Control for Tracking Control

Tracking-Differentiator-Based Sliding-Mode Control for Track...

引用

Chinese Automation Congress (CAC)

作者： Wenfei Li Boyuan Li Wei Hua Chao Huang Haiping Du Haitao Xing Research center for intelligent transportation Zhejiang lab Hangzhou China Department of Industrial & Systems Engineering The Hong Kong Polytechnic University Hong Kong China School of Electrical Computer and Telecommunications Engineering University of Wollongong Wollongong Australia

Tracking control has attracted significant attention because of its close link with industrial applications. Tracking control requires that a control algorithm can ensure that an actuator follows control commands, with a fast response anti-disturbance abilities and small chattering. A tracking-differentiator-based sliding-mode control approach for tracking control is proposed in this paper. A tracking differentiator has the ability to obtain the desired signal's differential signal, even when there is noise in the desired signal. A differential signal is often required in the design of sliding-mode controllers. When tracking differentiator is applied to a sliding-mode controller, the chattering of the control commands (caused by noise disturbance) can be reduced while the fast response of the sliding-mode controller can be maintained. The simulation results show that the proposed controller is effective.

关键词：

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：