检索结果-内蒙古大学图书馆

IEEE International Conference on robotics and Biomimetics

作者： Menglong Ding Yanyan Zhang Shiqiang Zhu Wei Song Pengyu Zhao Xufei Yan Jiandong Cai Jason Gu Anhuan Xie Research Center for Intelligent Robotics Research Institute of Interdisciplinary Innovation Zhejiang Lab Hangzhou China Zhejiang Engineering Research Center for Intelligent Robotics Hangzhou China Department of Electrical and Computer Engineering Dalhousie University Halifax NS Canada

ISBN: (纸本)9781665481106

The aerodynamic interaction among rotors is a key phenomenon that influences the performance of the electric Vertical Takeoff and Landing (eVTOL) aircraft. This study applied Lattice-Boltzmann Method (LBM) to systematically investigate the aerodynamic interaction under typical flight conditions. Simulation of a single rotor was performed to validate the reliability of LBM on rotor aerodynamics and find the maximum acceptable grid size. A numerical study on the complex unsteady flowfield caused by the sixteen rotors was also performed when considering the eVTOL is in hovering, forward flight and hovering under sidewind. Moreover, the analysis of the flowfield provides a detailed insight into the flow physics involved in such regular flight conditions.

关键词： Visualization Atmospheric modeling Rotors Aerodynamics Numerical models Reliability Aircraft

来源：评论

学校读者我要写书评

暂无评论

Van der Waals device integration beyond the limits of van der Waals forces using adhesive matrix transfer

引用

Nature Electronics 2024年第1期7卷 17-28页

作者： Satterthwaite, Peter F. Zhu, Weikun Jastrzebska-Perfect, Patricia Tang, Melbourne Spector, Sarah O. Gao, Hongze Kitadai, Hikari Lu, Ang-Yu Tan, Qishuo Tang, Shin-Yi Chueh, Yu-Lun Kuo, Chia-Nung Lue, Chin Shan Kong, Jing Ling, Xi Niroui, Farnaz Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA United States Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA United States Department of Chemical Engineering Massachusetts Institute of Technology CambridgeMA United States Department of Physics Massachusetts Institute of Technology CambridgeMA United States Department of Chemistry Boston University BostonMA United States Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei Taiwan College of Semiconductor Research National Tsing Hua University Hsinchu Taiwan Department of Physics National Cheng Kung University Tainan Taiwan Taiwan Consortium of Emergent Crystalline Materials National Science and Technology Council Taipei Taiwan Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan Taiwan Division of Materials Science and Engineering Boston University BostonMA United States The Photonics Center Boston University BostonMA United States

Pristine van der Waals (vdW) heterostructures formed between two-dimensional (2D) and other materials can be used to create optical and electronic devices. However, the weak vdW forces alone do not allow direct physical stacking of arbitrary layers. As a result, vdW heterostructure fabrication typically requires solvents, sacrificial layers or high temperatures, which can introduce damage and contaminants. Here, we show that adhesive matrix transfer can eliminate these limitations and can provide vdW integration beyond the limits of vdW forces. In the approach, a hybrid high- and low-adhesion surface is used to decouple the forces driving the transfer from the vdW forces defining the heterostructure of interest. We show that the technique can be used to achieve direct vdW integration of diverse 2D materials (MoS2, WSe2, PtS2 and GaS) with dielectrics (SiO2 and Al2O3), which is conventionally forbidden but critical for active devices and scalable, aligned heterostructure formation. The approach also allows single-step 2D material-to-device integration, which we illustrate by fabricating arrays of monolayer MoS2 transistors. As any exposure to solvents or polymers is avoided, the interfaces and surfaces remain pristine. Thus, intrinsic 2D material properties can be probed without the influence of processing steps. The materials can be further engineered through surface treatments and used to fabricate unconventional device form factors. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Evaluation of the Improvement in Hierarchical Lossless Video Compression

Evaluation of the Improvement in Hierarchical Lossless Video...

引用

International Conference on Control, Decision and Information Technologies (CoDIT)

作者： Donia Ammous Amina Kessentini Naziha Khlif Fahmi Kammoun Nouri Masmoudi Electrical engineering Department Laboratory of Electronics and Information Technologies National Engineering School of Sfax Sfax University Sfax Tunisia Electronics and telecommunications department Higher Institute of Computer and Multimedia of Gabes Gabes university Gabes Tunisia

The digital medical video is widely used in several healthcare institutions and medical centers. Therefore, a considerable storage space and a high transmission bandwidth are necessary. Thus, efficient compression tools are required to reduce the storage space and fit bandwidth capacities. Indeed, several lossy and lossless compression techniques are applied. Lossy techniques ensure a good performance. But they lead to erroneous medical data, which can negatively affect the doctor's decisions about the patient's health conditions. As a result, lossless compression guarantees an optimal solution for medical applications. Among available lossless techniques, H.264/AVC (Advanced Video Coding) presents high coding performance in lossless compression. H.264/AVC was chosen since it simplicity in terms of computational complexity. It is suitable for mobile devices that require high resolution. In this paper, several techniques used with the H.264/AVC are discussed. Moreover, a new approach is applied to enhance the lossless techniques. Its results show an important compression ratio compared to the previous works. The enhanced method results in an increase in compression ratio from 8,429 to 16,159. Besides, the gain performance reaches from 32,625 to 42.074 %.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A unified analytical method to quantify three types of fast frequency response from inverter-based resources

A unified analytical method to quantify three types of fast ...

引用

22nd Wind and Solar Integration Workshop (WIW 2023)

作者： S. Dong X. Fang J. Tan N. Gao X. Cui A. Hoke Power Systems Energy Center National Renewable Energy Laboratory Golden USA Department of Electrical and Computer Engineering Mississippi State University Starkville USA Department of Energy Science & Engineering Stanford University Stanford USA

With more inverter-based resources (IBRs), our power systems have lower frequency nadirs following N-1 contingencies, and undesired under-frequency load shedding (UFLS) can occur. To address this challenge, IBRs can be programmed to provide at least three types of fast frequency response (FFR), e.g., step response, proportional response (P/f droop response), and derivative response (synthetic inertia). However, these heterogeneous FFR challenge the study of power system frequency dynamics. Thus, this paper develops an analytical frequency nadir prediction method that allows for the consideration of all three potential forms of FFR provided by IBRs. The proposed method provides fast and accurate frequency nadir estimation after N-1 generation tripping contingencies. Our method is grounded on the closed-form solution for the frequency nadir, which is solved from the second-order system frequency response model considering the governor dynamics and three types of FFR. The simulation results in the IEEE 39-bus system with different types of FFR demonstrate that the proposed method provides an accurate and fast prediction of the frequency nadir under various disturbances.

关键词：

来源：评论

学校读者我要写书评

暂无评论

How Strong a Kick Should be to Topple Northeastern’s Tumbling Robot?

arXiv

引用

arXiv 2023年

作者： Salagame, Adarsh Bhattachan, Neha Caetano, Andre McCarthy, Ian Noyes, Henry Petersen, Brandon Qiu, Alexander Schroeter, Matthew Smithwick, Nolan Sroka, Konrad Widjaja, Jason Bohra, Yash Venkatesh, Kaushik Gangaraju, Kruthika Ghanem, Paul Mandralis, Ioannis Sihite, Eric Kalantari, Arash Ramezani, Alireza The Silicon Synapse Labs Department of Electrical and Computer Engineering Northeastern University Boston United States The Department of Aerospace Engineering California Institute of Technology Pasadena United States Jet Propulsion Laboratory Pasadena United States

Rough terrain locomotion has remained one of the most challenging mobility questions. In 2022, NASA’s Innovative Advanced Concepts (NIAC) Program invited US academic institutions to participate NASA’s Breakthrough, Innovative & Game-changing (BIG) Idea competition by proposing novel mobility systems that can negotiate extremely rough terrain, lunar bumpy craters. In this competition, Northeastern University won NASA’s top Artemis Award award by proposing an articulated robot tumbler called COBRA (Crater Observing Bio-inspired Rolling Articulator). This report briefly explains the underlying principles that made COBRA successful in competing with other concepts ranging from cable-driven to multi-legged designs from six other participating US institutions. Copyright © 2023, The Authors. All rights reserved.

关键词： NASA

来源：评论

学校读者我要写书评

暂无评论

Coherent and incoherent laser pump on a five-level atom in a strongly coupled cavity-QED system

引用

Physical Review A 2022年第1期105卷 013701-013701页

作者： Asha Devi Sarath D. Gunapala Malin Premaratne Advanced Computing and Simulation Laboratory Department of Electrical and Computer Systems Engineering Monash University Clayton Victoria 3800 Australia Jet Propulsion Laboratory California Institute of Technology Pasadena California 91109 USA

We propose a cavity quantum electrodynamic system consisting of a five-level atom coupled to a single mode of the cavity electromagnetic field. The study is focused on the regime of strong coupling between the cavity and atom. Pump laser fields and cavity fields connect the split energy levels of the atom. Instead of the well-known two-level Dicke model obtained by adiabatic elimination of the high-energy levels, we consider the pump lasers' detunings to the atomic transitions to be very small such that we can examine the influence of the higher-energy states. We have studied the effect of an external coherent drive and incoherent pumping on these higher-energy levels and observed the enhancement of intracavity photon numbers due to quantum coherence effects. The amplification of intracavity photons is achieved even without a population inversion. However, the effect of the coherent and incoherent drive is negligible for very large detunings when the higher-energy states are adiabatically eliminated. At zero and small detunings, the system reaches the steady state at an earlier instant of time for higher incoherent pumping. We find an almost agreeable steady-state behavior of the system's exact full quantum dynamics model and its semiclassical approximation. Our model tries to accurately simulate the open system by considering the cavity decay, spontaneous decay, and dephasing of the system.

关键词： Atoms, ions, & molecules in cavities Cavity quantum electrodynamics Nanophotonics

来源：评论

学校读者我要写书评

暂无评论

Discrete control algorithms for systems with big dead time for control101 MATLAB toolbox

Discrete control algorithms for systems with big dead time f...

引用

Cybernetics & Informatics (K&I)

作者： Ruth Bars Gyula Max J. Anthony Rossiter László Keviczky Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary School of Electrical and Electronic Engineering University of Sheffield Sheffield UK Systems and Control Laboratory Institute for Computer Science and Control Budapest Hungary

ISBN: (数字)9798331541811

ISBN: (纸本)9798331541828

The first course of control is under a critical review. Both the teaching material covered and the teaching methods require new considerations. Introducing interactivity in the education process makes the learning more successful and enjoyable. MATLAB provides an effective environment for learning and applying different disciplines. Control101 is a new MATLAB toolbox under development which provides tools for interactive learning of control disciplines. This paper presents the framework for teaching discrete control algorithms applied for processes containing large dead times.

关键词： Visualization Systematics PI control Reviews Education Laboratories Process control Prediction algorithms PD control MATLAB

来源：评论

学校读者我要写书评

暂无评论

Utilization of Artifact and Noise Affected Electrocardiogram for Simultaneous Heart Rate Computation and Motion Type Inference

Utilization of Artifact and Noise Affected Electrocardiogram...

引用

IEEE SENSORS

作者： Jihwan Kim Hyun Bin Kim Dengyang Lu Byeong Woon Lee Wooseok Kim Sang Uk Park Hee Kyu Lee Jaejun Lim Yida Wang Seunghwan Seo Sang Min Won Department of Electrical and Computer Engineering Sungkyunkwan University Suwon South Korea Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA USA Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA

The specific objective of developing neural interfaces is to analyze the electrophysiological signals associated with neural activities within the body, with the aim of providing early diagnosis for diseases related to the neural system. One example is the electrocardiogram (ECG) that assesses the functionality of the heart, identifying arrhythmias and potentially pinpointing the location of any malfunction. Conventional clinical protocols require cardiac electrical signal measurements to be conducted during a stationary phase, with an emphasis on minimizing noise interference as much as possible. While this holds true in clinical scenarios, such motion artifacts can be valuable sources of information for motion tracking. In this study, we present a methodology where we demonstrate the simultaneous monitoring and computation of both heart rate and motion using a wireless ECG sensing system with a three-electrode configuration.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Feature-Fused Deep Learning Approach for Hand Gesture Recognition in Intelligent Myoelectric Hand

引用

IEEE Sensors Journal 2025年

作者： Yan, Lingyun Bi, Luzheng Zhang, Zhihong Wei, Yuyang Xiu, Haohua Shanghai Institute of Technology School of Electrical and Electronic Engineering Shanghai201418 China Beijing Institute of Technology School of Mechanical Engineering Beijing100811 China University of Oxford Department of Engineering Science OxfordOX1 3PJ United Kingdom Jilin University Key Laboratory of Bionic Engineering Ministry of Education Changchun130022 China Ningbo University of Technology Robotics Institute of NBUT Ningbo315211 China

Accurate and efficient hand gesture recognition is a cornerstone for advancing the functionality of myoelectric prostheses, enabling intuitive and responsive human-machine interaction. In this study, we present a novel hybrid deep learning architecture that synergistically integrates convolutional neural networks (CNNs) with Transformer models to achieve unprecedented accuracy in electromyogram (EMG)-based hand gesture classification. By leveraging advanced feature engineering, we extract and combine time-domain, frequency-domain, and time-frequency features to provide a comprehensive representation of muscle activity patterns. This approach addresses critical challenges in existing methods, such as poor generalization and limited robustness to subject variability. The proposed system achieves a state-of-the-art recognition accuracy of 98.5% and an F1-score of 0.98 across 12 distinct hand gestures, surpassing existing methodologies. Additionally, we validate the practicality of our system by implementing it in a real-time control platform for a myoelectric hand, demonstrating its capability to perform precise, real-world motor tasks. Our findings represent a significant step forward in neural systems and rehabilitation engineering, offering a transformative solution for enhancing the usability and functionality of intelligent myoelectric prostheses. © 2001-2012 IEEE.

关键词： Myoelectrically controlled prosthetics

来源：评论

学校读者我要写书评

暂无评论

On the Diagnosis of Nonalcoholic Steatohepatitis Using Dielectric Properties: Feasibility in Mouse Model

On the Diagnosis of Nonalcoholic Steatohepatitis Using Diele...

引用

IEEE International Conference on Electro-Information Technology

作者： Akhila Sai Sree Cherukuri Poulami Samaddar Alejos Aguero Carlos Keerthy Gopalakrishnan Sunil Gaddam Lucia T. Valenzuela Perez Hyun Se Kim Lee Shuvashis Dey Sayan Roy Dipankar Mitra Petra Hirsova Shivaram P. Arunachalam Microwave Engineering & Imaging Laboratory (MEIL) Division of Gastroenterology & Hepatology Mayo Clinic Rochester MN USA GIH Artificial Intelligence Laboratory (GAIL) Division of Gastroenterology and Hepatology Mayo Clinic Rochester MN USA Department of Electrical and Computer Engineering North Dakota State University Fargo ND USA Department of Electrical Engineering and Computer Science South Dakota Mines Rapid City USA Department of Computer Science & Computer Engineering University of Wisconsin-La Crosse La Crosse WI USA Department of Medicine Mayo Clinic Rochester MN USA Department of Radiology Mayo Clinic Rochester MN USA

Nonalcoholic steatohepatitis (NASH) is a chronic liver disease that can progress to cirrhosis, liver failure, and hepatocellular cancer. Currently, liver biopsy is the gold standard for diagnosis, but it is invasive and risky. Therefore, there is a need for non-invasive diagnostic tools. Recent studies have shown that microwaves and dielectric spectroscopy can differentiate between healthy and diseased liver tissue and can provide information on the severity of NASH. In this study, we used ex vivo NASH mouse model tissues to diagnose NASH using dielectric spectroscopy, a non-invasive technique. According to our study results, the novelty of the study lies in differentiating the various NASH diseased tissue and analyzing them using cole-cole parameters, suggesting the potential development of a noninvasive diagnostic and treatment monitoring tool for NASH. If successful, the use of microwaves could revolutionize the field of NASH diagnosis and monitoring, providing a safer and more convenient alternative to liver biopsy. However, additional research is required to validate this approach and optimize its sensitivity and specificity.

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：