检索结果-内蒙古大学图书馆

Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Hsin-Che Hsieh Jih-Sheng Lai The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

ISBN: (数字)9798331516116

ISBN: (纸本)9798331516123

The robustness and relative insensitivity to misalignments and mismatches make the LCC topology popular in wireless power transfer (WPT) applications, including more challenging dynamic or multi-receiver WPT systems. The output of LCC topology based WPT systems is typically regulated by an additional dc-dc converter stage, either before or after the WPT stage. The additional dc-dc stage increases the cost and complexity of the system and would require wireless communication for output regulation if placed on the transmitter side, making the system susceptible to electromagnetic interference. In this paper, a receiver side modulation scheme based on a variable inductor controlled notch filter is proposed. By modulating the variable inductor, the output can be independently adjustable in a wide-range. The variable inductor is controlled with simple pulse width modulation (PWM). The proposed control scheme is especially suitable for multi-receiver WPT systems; where transmitter based regulation schemes cannot simultaneously accommodate multiple receivers. The proposed system is verified experimentally with a 48-V o(max) , 72-W prototype WPT system with multi-receiver capability.

关键词： Wireless communication Prototypes Receivers Wireless power transfer Pulse width modulation Regulation Topology Inductors Voltage control Notch filters

来源：评论

学校读者我要写书评

暂无评论

Optimized ROI Extraction and Pixel Reduction Methods for Kidney Abnormality Detection

Optimized ROI Extraction and Pixel Reduction Methods for Kid...

引用

IEEE Southeastcon

作者： Md Junayed Hossain Md Fahad Monir Tarem Ahmed Department of Computer Science & Engineering Independent University Bangladesh (IUB) Bangladesh Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University USA

ISBN: (数字)9798331504847

ISBN: (纸本)9798331504854

A global public health concern, Chronic Kidney Disease causes renal failure, cardiovascular disease, and premature death. Given the frequency of kidney diseases and their significant impact on public health, detection of any abnormalities in the kidney is crucial. Effective patient treatment and medical care planning depend on the early and precise diagnosis of a variety of kidney abnormalities. Early detection enable treatments that enhance patient outcomes, slow the progression of disease, and lessen the strain on healthcare systems. In order to detect anomalies in kidney, we utilized the Region of Interest (ROI) and Pixel Reduction techniques separately in this work. We have applied the Bicubic Interpolation method to reduce the size of individual pixels in an image while preserving a significant data of the original image data. A novel hybrid strategy that aims to preserve diagnostic data while reducing computing complexity uses the original images for ROI extraction. The deep learning method is then independently trained and tested using the pixel-reduced and localized dataset. In order to categorize the images, we use Inception V3 and EfficientNet B7 as Deep Learning models. Using the ROI-extracted data, we were able to achieve approximately 99.75% accuracy with the EfficientNet B7 model. Moreover, the same algorithm and dataset were used to obtain 98.45%, 99.02%, and 98.78% Precision, Recall, and F1-score, respectively. This framework provides medical professionals with a helpful prognostic tool to early detect identify various forms of kidney abnormalities.

关键词： Deep learning Interpolation Medical treatment Data models Planning Data mining Public healthcare Kidney Medical diagnostic imaging Strain

来源：评论

学校读者我要写书评

暂无评论

Achromatic metasurfaces by dispersion customization for ultra-broadband acoustic beam engineering

引用

国家科学评论（英文版） 2022年第12期9卷 179-189页

作者： Hao-Wen Dong Chen Shen Sheng-Dong Zhao Weibao Qiu Hairong Zheng Chuanzeng Zhang Steven A.Cummer Yue-Sheng Wang Daining Fang Li Cheng Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA Department of Mechanical Engineering Rowan UniversityGlassboroNJ 08028USA School of Mathematics and Statistics Qingdao UniversityQingdao 266071China Paul C.Lauterbur Research Center for Biomedical Imaging Institute of Biomedical and Health EngineeringShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Department of Civil Engineering University of SiegenD-57068 SiegenGermany Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin 300350China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Metasurfaces,the ultra-thin media with extraordinary wavefront modulation ability,have shown great promise for many potential ***,most of the existing metasurfaces are limited by narrow-band and strong dispersive modulation,which complicates their real-world applications and,therefore require strict customized *** address this issue,we report a general methodology for generating ultra-broadband achromatic metasurfaces with prescribed ultra-broadband achromatic properties in a bottom-up inverse-design *** demonstrate three ultra-broadband functionalities,including acoustic beam deflection,focusing and levitation,with relative bandwidths of 93.3％,120％and 118.9％,*** addition,we reveal a relationship between broadband achromatic functionality and element *** metasurface elements have anisotropic and asymmetric geometries with multiple scatterers and local cavities that synthetically support internal resonances,bi-anisotropy and multiple scattering for ultra-broadband customized *** study opens new horizons for ultra-broadband highly efficient achromatic functional devices,with promising extension to optical and elastic metamaterials.

关键词： ultra-broadband metasurfaces achromatic inverse design customized dispersion multiple scatering

来源：评论

学校读者我要写书评

暂无评论

Compact Two-Stage Origami Horn Antenna for Terahertz CubeSat Networks

Compact Two-Stage Origami Horn Antenna for Terahertz CubeSat...

引用

2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2022

作者： Alqaraghuli, Ali J. Singh, Arjun Jornet, Josep M. Northeastern University Department of Electrical and Computer Engineering BostonMA United States SUNY Polytechnic Institute Department of Engineering UticaNY United States

ISBN: (数字)9781665496582

ISBN: (纸本)9781665496582

With the rapid proliferation of high-speed satellite communication networks enabled by dense constellations in space, CubeSats are expected to be more compact than ever while maintaining large bandwidth operation. A candidate enabler for high-data-rate CubeSat constellations is the terahertz (THz) band (0.1-10 THz), which supports both compactness and large bandwidth. These two come at the cost of high propagation losses and impose the use of very high gain directional antennas, which on their turn drastically impact otherwise simple tasks such as neighbor discovery and broadcasting with nearby satellites. To simultaneously alleviate the challenges of neighbor discovery while overcoming the high path losses in long links, a THz origami horn antenna utilizing commercially-available WR4 waveguide is presented. The proposed antenna has two stages supporting phases of neighbor discovery and high-data-rate communication. The two stages demonstrate gains of 15.7 dBi and 30.7 dBi, respectively, at 218 GHz. The horn antenna is explored as a solution for enabling CubeSat swarms at terahertz frequencies. © 2022 IEEE.

关键词： Horn antennas

来源：评论

学校读者我要写书评

暂无评论

G-Band Metamaterial-Based Circulator for FCC-Compliant Space-to-Earth Communication 32

G-Band Metamaterial-Based Circulator for FCC-Compliant Space...

引用

32nd International Symposium of Space Terahertz Technology, ISSTT 2022

作者： Alqaraghuli, Ali J. Aliaga, Sergi Singh, Arjun Jornet, Josep M. Department of Electrical and Computer Engineering Northeastern University BostonMA United States Department of Engineering SUNY Polytechnic Institute UticaNY United States

A metamaterial-based circulator operating at G-band is presented for the purpose of high-data-rate space-to-Earth communication. The circulator is designed to be equipped on a CubeSat using a single antenna, integrating a metamaterial within an interface of three WR3 waveguides measuring 3 mm in length per waveguide. The isolation is achieved between transmitting (downlink) signals at 295 GHz and reception (uplink) at 218 GHz. The frequencies are chosen in accordance with FCC regulations and aim to provide a high-data-rate download link for CubeSats deployed in non-terrestrial networks. © 2022 32nd International Symposium of Space Terahertz Technology, ISSTT 2022 All rights reserved.

关键词： Metamaterials

来源：评论

学校读者我要写书评

暂无评论

Path Planning and Optimization for Cuspidal 6R Manipulators

arXiv

引用

arXiv 2025年

作者： Elias, Alexander J. Wen, John T. Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States

A cuspidal robot can move from one inverse kinematics (IK) solution to another without crossing a singularity. Multiple industrial robots are cuspidal. They tend to have a beautiful mechanical design, but they pose path planning challenges. A task-space path may have a valid IK solution for each point along the path, but a continuous joint-space path may depend on the choice of the IK solution or even be infeasible. This paper presents new analysis, path planning, and optimization methods to enhance the utility of cuspidal robots. We first demonstrate an efficient method to identify cuspidal robots and show, for the first time, that the ABB GoFa and certain robots with three parallel joint axes are cuspidal. We then propose a new path planning method for cuspidal robots by finding all IK solutions for each point along a task-space path and constructing a graph to connect each vertex corresponding to an IK solution. Graph edges are weighted based on the optimization metric, such as minimizing joint velocity. The optimal feasible path is the shortest path in the graph. This method can find non-singular paths as well as smooth paths which pass through singularities. Finally, this path planning method is incorporated into a path optimization algorithm. Given a fixed workspace toolpath, we optimize the offset of the toolpath in the robot base frame while ensuring continuous joint motion. Code examples are available in a publicly accessible repository. © 2025, CC BY.

关键词： Inverse kinematics

来源：评论

学校读者我要写书评

暂无评论

Evolution of Artificial Intelligence and Machine Learning in Betterment of Healthcare Services 1

Evolution of Artificial Intelligence and Machine Learning in...

引用

1st International Conference on Healthcare Innovations, Software and engineering Technologies, HISET 2024

作者： Abu Eid, Aws Ismail Maula, Shabana Wagh, Aparna Vyas, Vibha Patil, Prakash Sridhar, P. Arab Open University Faculty of Computing Studies Amman Jordan Jaywant College of Engineering and Polytechnic Department of Computer Science Engineering Karad India Jaywant College of Management Karad India College of Engineering Pune Department of Electronics and Telecommunication Pune India Department of Radio-Diagnosis Karad India Institute of Aeronautical Engineering Department of Electrical and Electronics Engineering Hyderabad India

ISBN: (纸本)9798350360707

Artificial Intelligence usually comprises a system that is composed of hardware and software. Machine learning is a subset of artificial intelligence (AI). The study discovered that the environment and contemporary technology on the current healthcare services have created new demands, which has led to the formation of these five categories of research. By matching eligible patients with clinical trials, AI technologies in the healthcare industry may also be beneficial for medical research. There are numerous other fascinating uses for AI in the biomedical field. It is evident that AI is becoming more and more relevant in the field of biomedicine. AI technologies may be able to assist in addressing significant health issues, but its potential may be constrained by the caliber of the health data that is now available and by the fact that AI cannot exhibit certain human traits, like empathy. Numerous ethical and societal concerns are brought up by the use of AI, many of which are also brought up by the use of data and healthcare technologies more generally. © 2024 IEEE.

关键词： Adversarial machine learning

来源：评论

学校读者我要写书评

暂无评论

Substation Cyberattack Detection and Mitigation in a High-Noise Environment

Substation Cyberattack Detection and Mitigation in a High-No...

引用

Innovative Smart Grid Technologies (ISGT)

作者： Hossein Amini Ali Mehrizi-Sani Chen-Ching Liu The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA

The power grid is vulnerable to cyberattacks due to the multitude of utilized communication-based devices. For example, remote terminal units (RTU) communicate commands or grid measurements. An encryption and decryption method is one way of preventing cyberattacks. However, sophisticated encryption and decryption methods can be time-consuming due to the large amount of data exchanged in a power system. This paper combines a Duffing oscillator, a time-based one-time frequency (TOTF) algorithm, and fast Fourier transform for preventing cyberattacks. The proposed method detects when an attacker distorts data in a high-noise environment. The proposed method is validated using simulation results on a modified communication layer by enabling the quadrature phase shift keying (QPSK) digital modulation method to transfer packets.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Improved Bound for Robust Causal Bandits with Linear Models

arXiv

引用

arXiv 2024年

作者： Yan, Zirui Mukherjee, Arpan Varici, Burak Tajer, Ali Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute TroyNY United States

This paper investigates the robustness of causal bandits (CBs) in the face of temporal model fluctuations. This setting deviates from the existing literature's widely-adopted assumption of constant causal models. The focus is on causal systems with linear structural equation models (SEMs). The SEMs and the time-varying pre- and post-interventional statistical models are all unknown and subject to variations over time. The goal is to design a sequence of interventions that incur the smallest cumulative regret compared to an oracle aware of the entire causal model and its fluctuations. A robust CB algorithm is proposed, and its cumulative regret is analyzed by establishing both upper and lower bounds on the regret. It is shown that in a graph with maximum in-degree d, length of the largest causal path L, and an aggregate model deviation C, the regret is upper bounded by O (dL-1 2 ( √ T + C)) and lower bounded by Ω(d L2 -2 max{ √ T , d2C}). The proposed algorithm achieves nearly optimal O ( √ T) regret when C is o( √ T), maintaining sub-linear regret for a broad range of C. Copyright © 2024, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Cyber-Resilient Control for a 100% Inverter-Based Microgrid: Analysis and Real-Time Simulation

Cyber-Resilient Control for a 100% Inverter-Based Microgrid:...

引用

International Conference on Intelligent Systems Applications to Power Systems (ISAP)

作者： Milad Beikbabaei Nguyen Khoa Nguyen Ali Mehrizi-Sani The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA

ISBN: (数字)9798331531751

ISBN: (纸本)9798331531768

As the U.S. moves toward cleaner electricity generation, the number of installed inverter-based resources such as wind and photovoltaic (PV) are on the rise. These inverter-based resources (IBR) rely on communication to update their real and reactive power set point; however, it opens room for cyberattacks. Previous work proposed ways to detect and mitigate cyberattacks for fully inverter-based microgrids using software simulation, but the feasibility of these methods needs to be tested using control hardware-in-the-loop (CHIL). This work develops a CHIL testbed using Typhoon HIL 402, Raspberry Pi 4, and a network switch to implement a cyber-resilient inverter control against false data injection (FDI) attacks. The Raspberry Pi 4 receives the electrical measurements from the Typhoon HIL using user datagram protocol (UDP) communication, runs the LSTM-based detection and mitigation code using the received measurements and sends back the corrected set point if an FDI attack is detected. The proposed method is tested on a fully inverter-based microgrid with four inverters under various scenarios.

关键词： Reactive power Protocols Tropical cyclones Prevention and mitigation Electric variables measurement Microgrids Switches Control systems Inverters Real-time systems

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：