检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Cheng, Xiaoxiao Shen, Shixian Ivanova, Ekaterina Carboni, Gerolamo Takagi, Atsushi Burdet, Etienne Department of Bioengineering Imperial College of Science Technology and Medicine London United Kingdom Department of Electrical and Electronic Engineering The University of Manchester Manchester United Kingdom School of Electronic Engineering and Computer Science Queen Mary University of London London United Kingdom NTT Communication Science Laboratories 3-1 Morinosato Wakamiya Kanagawa Atsugi243-0198 Japan

Humans activate muscles to shape the mechanical interaction with their environment, but can they harness this control mechanism to best sense the environment? We investigated how participants adapt their muscle activation to visual and haptic information when tracking a randomly moving target with a robotic interface. The results exhibit a differentiated effect of these sensory modalities, where participants’ muscle cocontraction increases with the haptic noise and decreases with the visual noise, in apparent contradiction to previous results. These results can be explained, and reconciled with previous findings, when considering muscle spring like mechanics, where stiffness increases with cocontraction to regulate motion guidance. Increasing cocontraction to more closely follow the motion plan favors accurate visual over haptic information, while decreasing it avoids injecting visual noise and relies on accurate haptic information. We formulated this active sensing mechanism as the optimization of visuo-haptic information and effort. This OIE model can explain the adaptation of muscle activity to unimodal and multimodal sensory information when interacting with fixed or dynamic environments, or with another human, and can be used to optimize human-robot interaction. Copyright © 2024, The Authors. All rights reserved.

关键词： Human robot interaction

来源：评论

学校读者我要写书评

暂无评论

Channel Knowledge Map Construction with Laplacian Pyramid Reconstruction Network

Channel Knowledge Map Construction with Laplacian Pyramid Re...

引用

IEEE Conference on Wireless Communications and Networking

作者： Zhenzhou Jin Li You Jue Wang Xiang-Gen Xia Xiqi Gao National Mobile Communications Research Laboratory Southeast University Nanjing China Purple Mountain Laboratories Nanjing China School of Information Science and Technology Nantong University Nantong China Department of Electrical and Computer Engineering University of Delaware Newark DE USA

ISBN: (数字)9798350303582

ISBN: (纸本)9798350303599

Channel knowledge map (CKM) has received widespread attention as an emerging enabling technology for environment-aware wireless communications. It involves the construction of databases containing location-specific channel knowledge, which are then leveraged to facilitate channel state information (CSI) acquisition and transceiver design. In this paper, we propose a Laplacian pyramid (LP)-based CKM construction scheme to predict the channel knowledge at arbitrary locations in a targeted area. Specifically, we first view the channel knowledge as a 2-D image and transform the CKM construction problem into an image to image (I2I) inpainting task, which predicts the channel knowledge at specific location by recovering the corresponding pixel value in the image matrix. Then, inspired by the reversible and closed-form frequency band decomposition structure of the LP, we design tailored subnetworks for different frequency components. In addition, to encode the global structural information of the propagation environment, we introduce self-attention and cross-covariance attention mechanisms in different layers, respectively. Experiments demonstrate that the proposed scheme can accurately reconstruct the CKM with low computational complexity. Moreover, the proposed method has a strong generalization ability to be implemented in different wireless communication scenarios.

关键词： Knowledge engineering Wireless communication Laplace equations Databases Transforms Transceivers Matrix decomposition

来源：评论

学校读者我要写书评

暂无评论

A Machine Learning-Based Approach to Model Highly-Thermally Robust Metasurface Absorber

A Machine Learning-Based Approach to Model Highly-Thermally ...

引用

Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Sumbel Ijaz Sadia Noureen Bacha Rehman Muhammad Zubair Muhammad Qasim Mehmood Yehia Massoud Electrical Engineering Department MicroNano Lab Information Technology University of the Punjab Lahore Pakistan Department of Computer Science Namal University Mianwali Punjab Pakistan Innovative Technologies Laboratories (ITL) Electrical and Computer Engineering King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

For accelerating design procedure of compact and efficient on-chip nano-photonics and to aid computationally expensive, time-exhaustive state-of-the-art iterative simulation schemes, regression-based machine-learning models are demonstrated that predict the optical response and structural parameters of the meta-atoms.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Spin-wave eigenmodes in nanoscale magnetic tunnel junctions with perpendicular magnetic anisotropy

引用

Physical Review Applied 2025年第3期23卷 034086-034086页

作者： Andrea Meo Chengcen Sha Emily Darwin Riccardo Tomasello Mario Carpentieri Ilya N. Krivorotov Giovanni Finocchio Department of Electrical and Information Engineering Politecnico di Bari I-70125 Bari Italy Department of Physics and Astronomy University of California Irvine California 92697 USA Magnetic & Functional Thin Films Lab Empa Swiss Federal Laboratories for Materials Science and Technology CH-8600 Dübendorf Switzerland Department of Mathematical and Computer Sciences Physical Sciences and Earth Sciences University of Messina I-98166 Messina Italy

Magnetic tunnel junctions (MTJs) are key enablers of spintronic technologies used in a variety of applications, including information storage, microwave generation and detection, and unconventional computing. Here, we present experimental and theoretical studies of the quantized spin wave eigenmodes in perpendicular MTJs focusing on the coupled magnetization dynamics in the free (FL) and reference (RL) layers of the MTJ, where the RL is a synthetic antiferromagnet (SAF). Spin-torque ferromagnetic resonance (ST-FMR) measurements reveal the excitation of two spin-wave eigenmodes in response to an applied microwave current. These modes show opposite frequency shifts as a function of an out-of-plane magnetic field. Our micromagnetic simulations accurately reproduce the dependence of the mode frequencies on the magnetic field and reveal the spatial profiles of the excitations in the FL and RL. The FL and RL modes generate rectified voltage signals of opposite polarity, which makes this device a promising candidate for a tunable dual-frequency microwave signal detector. The simulations show that a weak interlayer exchange coupling within the SAF enhances the mode amplitudes. We also calculate the response of the detector as a function of an in-plane magnetic field bias and find that its sensitivity significantly grows with increasing field strength. We experimentally confirm this prediction via ST-FMR measurements as a function of the in-plane magnetic field. Our results provide a deeper understanding of the quantized spin-wave eigenmodes in nanoscale MTJs with perpendicular magnetic anisotropy and demonstrate the potential of these devices for frequency-selective dual-channel microwave signal detectors.

关键词： Spin waves

来源：评论

学校读者我要写书评

暂无评论

Application of Weighted Chebyshev Approximation in Pulse Design for Quantum Gates

Application of Weighted Chebyshev Approximation in Pulse Des...

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： Qi Ding Alan V. Oppenheim Petros T. Boufounos Simon Gustavsson Jeffrey A. Grover Thomas A. Baran William D. Oliver Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Mitsubishi Electric Research Laboratories Cambridge MA USA Department of Physics Massachusetts Institute of Technology Cambridge MA USA Atlantic Quantum Cambridge MA USA

ISBN: (数字)9798350373752

ISBN: (纸本)9798350373769

Chebyshev approximation problems are fundamen-tal in approximation theory and are integral to various engi-neering applications. In this study, we suggest that weighted Chebyshev approximation (WCA) can be effectively applied to designing quantum gates. Specifically, we examine a class of two-qubit gates in superconducting qubits known as controlled-phase (CPHASE) gates, which leverage interactions between higher levels controlled by baseband flux pulses. We frame the design of CPHASE gates as a pulse design problem and propose Chebyshev pulses, generated through WCA, as an alternative solution. We utilize an illustrative example to demonstrate our process of designing a Chebyshev pulse with WCA, then contrast it with a benchmark Slepian pulse for comparison. We find that Chebyshev pulses can facilitate faster CPHASE gates while ensuring leakage errors remain below the desired threshold.

关键词： Baseband Simulation Design methodology Conferences Qubit Logic gates Chebyshev approximation Benchmark testing Signal processing Iterative methods

来源：评论

学校读者我要写书评

暂无评论

Analysis of Coding Gain Due to In-Loop Reshaping

arXiv

引用

arXiv 2023年

作者： Wong, Chau-Wai Fu, Chang-Hong Xu, Mengting Su, Guan-Ming The Department of Electrical and Computer Engineering NC State University NC27695 United States The School of Electronic and Optical Engineering Nanjing University of Science and Technology Jiangsu210094 China The Dolby Laboratories SunnyvaleCA94085 United States

Reshaping, a point operation that alters the characteristics of signals, has been shown capable of improving the compression ratio in video coding practices. Out-of-loop reshaping that directly modifies the input video signal was first adopted as the supplemental enhancement information (SEI) for the HEVC/H.265 without the need to alter the core design of the video codec. VVC/H.266 further improves the coding efficiency by adopting in-loop reshaping that modifies the residual signal being processed in the hybrid coding loop. In this paper, we theoretically analyze the rate–distortion performance of the in-loop reshaping and use experiments to verify the theoretical result. We prove that the in-loop reshaping can improve coding efficiency when the entropy coder adopted in the coding pipeline is suboptimal, which is in line with the practical scenarios that video codecs operate in. We derive the PSNR gain in a closed form and show that the theoretically predicted gain is consistent with that measured from experiments using standard testing video sequences. © 2023, CC BY-NC-SA.

关键词： Image compression

来源：评论

学校读者我要写书评

暂无评论

Statistically characterizing robustness and fidelity of quantum controls and quantum control algorithms

引用

Physical Review A 2023年第3期107卷 032606-032606页

作者： Irtaza Khalid Carrie A. Weidner Edmond A. Jonckheere Sophie G. Shermer Frank C. Langbein School of Computer Science and Informatics Cardiff University Cardiff CF24 4AG United Kingdom Quantum Engineering Technology Laboratories H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering University of Bristol Bristol BS8 1FD United Kingdom Department of Electrical and Computer Engineering University of Southern California Los Angeles California 90089 USA Department of Physics Swansea University Swansea SA2 8PP United Kingdom

Robustness of quantum operations or controls is important to build reliable quantum devices. The robustness-infidelity measure (RIMp) is introduced to statistically quantify in a single measure the robustness and fidelity of a controller as the pth order Wasserstein distance between the fidelity distribution of the controller under any uncertainty and an ideal fidelity distribution. The RIMp is the pth root of the pth raw moment of the infidelity distribution. Using a metrization argument, we justify why RIM1 (the average infidelity) is a good practical robustness measure. Based on the RIMp, an algorithmic robustness-infidelity measure (ARIM) is developed to quantify the expected robustness and fidelity of controllers found by a control algorithm. The utility of the RIM and ARIM is demonstrated on energy landscape controllers of spin-12 networks subject to Hamiltonian uncertainty. The robustness and fidelity of individual controllers as well as the expected robustness and fidelity of controllers found by different popular quantum control algorithms are characterized. For algorithm comparisons, stochastic and nonstochastic optimization objectives are considered. Although high fidelity and robustness are often conflicting objectives, some high-fidelity, robust controllers can usually be found, irrespective of the choice of the quantum control algorithm. However, for noisy or stochastic optimization objectives, adaptive sequential decision-making approaches, such as reinforcement learning, have a cost advantage compared to standard control algorithms and, in contrast, the high infidelities obtained are more consistent with high RIM values for low noise levels.

关键词： Machine learning Quantum computation Quantum control Quantum engineering Quantum information theory

来源：评论

学校读者我要写书评

暂无评论

High-Fidelity CFD Verification Workshop 2024: Shock-Dominated Flows

High-Fidelity CFD Verification Workshop 2024: Shock-Dominate...

引用

AIAA Aviation Forum and ASCEND, 2024

作者： Huang, Tianci Zahr, Matthew J. Holst, Kevin Freels, James D. Baker, A.J. Batten, Paul Bachchan, Nili Brad Maeng, Jungyeoul Fisher, Travis C. Kim, Dongseok Yune, Kyeol Kim, Chongam Kim, Juhyun Park, Jaehyeon Jee, Solkeun White, William J. Johnsen, Eric Department of Aerospace and Mechanical Engineering University of Notre Dame Notre DameIN46556-5637 United States Department of Electrical Engineering and Computer Science University of Tennessee KnoxvilleTN37996 United States Department of Mechanical Aerospace and Biomedical Engineering University of Tennessee KnoxvilleTN37996 United States Metacomp Technologies Inc. 31365 Oak Crest Drive #250 Westlake Village CA91361 United States Computational Thermal and Fluid Mechanics Sandia National Laboratories AlbuquerqueNM87185 United States Department of Aerospace Engineering Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Department of Aerospace System Engineering Sejong University Neungdong-ro Gwangjin-gu Seoul05006 Korea Republic of School of Mechanical Engineering Gwangju Institute of Science and Technology 123 Cheomdan-gwagi-ro Kuk-gu Gwangju61005 Korea Republic of University of Michigan Ann ArborMI48109 United States

This manuscript presents the test problems and results of the shock-dominated flow test suite of the first High-Fidelity CFD Verification Workshop held on January 6-7, 2024. © 2024, American Institute of Aeronaut... 详细信息

ISBN: (纸本)9781624107160

关键词： Shock testing

来源：评论

学校读者我要写书评

暂无评论

Beam Structured Signal Detection for HF Skywave Massive MIMO Communications

Beam Structured Signal Detection for HF Skywave Massive MIMO...

引用

IEEE Conference on Vehicular technology (VTC)

作者： Ding Shi Linfeng Song Xiqi Gao Jiaheng Wang Mats Bengtsson Geoffrey Ye Li National Mobile Communications Research Laboratory Southeast University Nanjing China Purple Mountain Laboratories Nanjing China School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Stockholm Sweden Department of Electrical and Electronic Engineering Imperial College London London U.K.

In this paper, we investigate signal detection for HF skywave massive multiple-input multiple-output (MIMO) communications with orthogonal frequency division multiplexing (OFDM) modulation. We first introduce beam based channel model (BBCM) in the space domain and reveal the sparsity of the channel in the space-beam domain. Based on the BBCM in the space domain, we propose a beam structured detector (BSD) for each subcarrier. Specifically, we prove that the space domain detector design can be transformed to that of a beam domain detector without sacrificing optimality, and the asymptotically optimal space domain detector is beam structured with a low-dimensional beam domain detector, thus significantly reducing the design and implementation complexities. Furthermore, we provide a beam selection criterion to choose the beams that are used for the BSD. Simulation results demonstrate the low complexity and satisfactory performance of the proposed detector.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Multi-color solitons and frequency combs in microresonators

arXiv

引用

arXiv 2024年

作者： Menyuk, Curtis R. Shandilya, Pradyoth Courtright, Logan Moille, Grégory Srinivasan, Kartik Computer Science and Electrical Engineering Department University of Maryland Baltimore County BaltimoreMD21250 United States Joint Quantum Institute NIST University of Maryland College ParkMD20742 United States Microsystems and Nanotechnology Division National Institute of Standards and Technology GaithersburgMD20899 United States

Multi-color solitons that are parametrically created in dual-pumped microresonators generate interleaved frequency combs that can be used to obtain combs at new frequencies and when synchronized can be used for low-noise microwave generation and potentially as an element in a chip-scale clockwork. Here, we first derive three-wave equations that describe multi-color solitons that appear in microresonators with a nearly quartic dispersion profile. These solitons are characterized by a single angular group velocity and multiple angular phase velocities. We then use these equations to explain the interleaved frequency combs that are observed at the output of the microresonator. Finally, we used these equations to describe the experimentally-observed soliton-OPO effect. In this effect, the pump frequency comb interacts nonlinearly with a signal frequency comb to create an idler frequency comb in a new frequency range, analogous to an optical parametric oscillation (OPO) process. We determine the conditions under which we expect this effect to occur. We anticipate that the three- wave equations and their extensions will be of use in designing new frequency comb systems and determining their stability and noise performance. © 2024, CC BY.

关键词： Solitons

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：