检索结果-内蒙古大学图书馆

18th IEEE International Conference on Networking, Sensing and Control, ICNSC 2021

作者： Li, Zhibin Li, Shuai Luo, Xin University of Chinese Academy of Sciences School of Computer Science and Technology Chongqing University of Posts and Telecommunications Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing School Chongqing China Swansea University Department of Electronics and Electrical Engineering Swansea United Kingdom University of Chinese Academy of Sciences Chongqing Key Laboratory of Big Data and Intelligent Computing Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing School Chongqing China

ISBN: (纸本)9781665440486

Robot arms have been widely used in industry. The absolute positioning error of robots without calibration can reach several millimeters, which cannot meet the application requirements of accurate operation. Therefore, it is almost a mandatory procedure for industrial robots to take on-site calibration before being used. Generally, most researchers on robot calibration have mechanical and instrumentation background as the collection of calibration data is tedious and it is usually difficult to access to industrial robots for researchers in other fields. This research explores the calibration problem from a machine learning perspective and provides the first open-access dataset called "RobotCali"in this area so that machine learning scientists can step into this field and verify their algorithms on this problem. In the meanwhile, a new calibration method based on the Levenberg-Marquardt (LM) algorithm and extended Kalman filter (EKF) algorithm is proposed, which can significantly improve the absolute positioning accuracy of the robot after calibration. Firstly, the error model of robot is established, and kinematic parameters are initially identified by LM algorithm. Then the EKF algorithm is used to further calibrate these parameters, which has been verified the effectiveness of the proposed method by experimental results. Lastly, the future research work is discussed. © 2021 IEEE.

关键词： Calibration

来源：评论

学校读者我要写书评

暂无评论

Multimode surface lattice resonance hybridization

Multimode surface lattice resonance hybridization

引用

Freeform Optics, Freeform 2021 - Part of OSA Optical Design and Fabrication 2021

作者： Lim, Theng Loo Reshef, Orad Saad Bin-Alam, M. Huttunen, Mikko J. Dolgaleva, Ksenia Boyd, Robert W. Department of Physics University of Ottawa 25 Templeton St. OttawaONK1N 6N52 Canada School of Electrical Engineering and Computer Science University of Ottawa 25 Templeton St. OttawaONK1N 6N5 Canada Laboratory of Photonics Tampere University TampereFI-33100 Finland The Institute of Optics University of Rochester RochesterNY14627 United States

We present a design for a plasmonic metasurface based on surface lattice resonances that features multiple pre-defined resonances. The resonance wavelengths are determined using inverse Fourier transforms of the parti... 详细信息

ISBN: (纸本)9781557528209

关键词： Resonance

来源：评论

学校读者我要写书评

暂无评论

Optimal Landing of Tilt-rotor Aircraft after Engine Failure Considering Pilot Inherent Limitations

Optimal Landing of Tilt-rotor Aircraft after Engine Failure ...

引用

IEEE International Conference on Robotics and Biomimetics

作者： Xufei Yan Renliang Chen Shiqiang Zhu Anhuan Xie Jason Gu Research Center for Intelligent Robotics Zhejiang Lab Hangzhou 311100 China. Zhejiang Engineering Research Center for Intelligent Robotics Hangzhou China National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics College of Aeronautics Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu China Intelligent Robot Research Center Zhejiang Lab Hangzhou Zhejiang China Department of Electrical and Computer Engineering Dalhousie University Halifax NS Canada

ISBN: (纸本)9781665481106

An augmented longitudinal rigid-body model is developed with a set of algebra equations describing the controls in the cockpit and the differential equations describing the pilot inherent limitations. The landing procedure after one engine failure is formulated into a nonlinear optimal control problem. XV-15 tilt-rotor aircraft is taken as the sample for the demonstration of landing in one engine failure during short takeoff. The results show that the total power required, thrust coefficient, longitudinal flapping angle and optimal controls are more relatively gentle than the solutions without considering the pilot inherent limitations. Compared with the basic longitudinal rigid-body model, the optimal solutions involve more control information.

关键词： Atmospheric modeling Optimal control Rotors Mathematical models History Aircraft propulsion Aircraft

来源：评论

学校读者我要写书评

暂无评论

Individual addressing of trapped ion qubits with geometric phase gates

arXiv

引用

arXiv 2022年

作者： Sutherland, R.T. Srinivas, R. Allcock, D.T.C. Department of Electrical and Computer Engineering University of Texas at San Antonio San AntonioTX78249 United States Department of Physics University of Oxford Clarendon Laboratory Parks Road OxfordOX1 3PU United Kingdom Oxford Ionics Limited Begbroke Science Park Begbroke OX5 1PF United Kingdom Department of Physics University of Oregon EugeneOR97403 United States

We propose a new scheme for individual addressing of trapped ion qubits, selecting them via their motional frequency. We show that geometric phase gates can perform single-qubit rotations using the coherent interference of spin-independent and (global) spin-dependent forces. The spin-independent forces, which can be generated via localised electric fields, increase the gate speed while reducing its sensitivity to motional decoherence, which we show analytically and numerically. While the scheme applies to most trapped ion experimental setups, we numerically simulate a specific laser-free implementation, showing cross-talk errors below 10−6 for reasonable parameters. © 2022, CC BY.

关键词： Trapped ions

来源：评论

学校读者我要写书评

暂无评论

Improved Heralded Single-Photon Source with a Photon-Number-Resolving Superconducting Nanowire Detector

引用

Physical Review Applied 2022年第6期18卷 064007-064007页

作者： Samantha I. Davis Andrew Mueller Raju Valivarthi Nikolai Lauk Lautaro Narvaez Boris Korzh Andrew D. Beyer Olmo Cerri Marco Colangelo Karl K. Berggren Matthew D. Shaw Si Xie Neil Sinclair Maria Spiropulu Division of Physics Mathematics and Astronomy California Institute of Technology 1200 E California Boulevard Pasadena California 91125 USA Alliance for Quantum Technologies (AQT) California Institute of Technology 1200 E California Boulevard Pasadena California 91125 USA Division of Engineering and Applied Science California Institute of Technology 1200 E California Boulevard Pasadena California 91125 USA Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena California 91109 USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology 50 Vassar Street Cambridge Massachusetts 02139 USA Fermi National Accelerator Laboratory P.O. Box 500 Batavia Illinois 60510 USA John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford Street Cambridge Massachusetts 02138 USA

Deterministic generation of single photons is essential for many quantum information technologies. A bulk optical nonlinearity emitting a photon pair, where the measurement of one of the photons heralds the presence of the other, is commonly used with the caveat that the single-photon emission rate is constrained due to a trade-off between multiphoton events and pair emission rate. Using an efficient and low noise photon-number-resolving superconducting nanowire detector we herald, in real time, a single photon at telecommunication wavelength. We perform a second-order photon correlation g2(0) measurement of the signal mode conditioned on the measured photon number of the idler mode for various pump powers and demonstrate an improvement of a heralded single-photon source. We develop an analytical model using a phase-space formalism that encompasses all multiphoton effects and relevant imperfections, such as loss and multiple Schmidt modes. We perform a maximum-likelihood fit to test the agreement of the model to the data and extract the best-fit mean photon number μ of the pair source for each pump power. A maximum reduction of 0.118±0.012 in the photon g2(0) correlation function at μ=0.327±0.007 is obtained, indicating a strong suppression of multiphoton emissions. For a fixed g2(0)=7×10−3, we increase the single pair generation probability by 25%. Our experiment, built using fiber-coupled and off-the-shelf components, delineates a path to engineering ideal sources of single photons.

关键词： Optical quantum information processing Quantum coherence & coherence measures Quantum communication Quantum engineering Quantum networks Quantum protocols Quantum teleportation Single photon sources

来源：评论

学校读者我要写书评

暂无评论

Physical Realization of Elastic Cloaking with a Polar Material

引用

Physical Review Letters 2020年第11期124卷 114301-114301页

作者： Xianchen Xu Chen Wang Wan Shou Zongliang Du Yangyang Chen Beichen Li Wojciech Matusik Nassar Hussein Guoliang Huang Department of Mechanical and Aerospace Engineering University of Missouri Columbia Missouri 65211 USA Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Electrical Engineering and Computer Science Department Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Engineering Mechanics Dalian University of Technology Dalian 116023 People’s Republic of China

An elastic cloak is a coating material that can be applied to an arbitrary inclusion to make it indistinguishable from the background medium. Cloaking against elastic disturbances, in particular, has been demonstrated using several designs and gauges. None, however, tolerate the coexistence of normal and shear stresses due to a shortage of physical realization of transformation-invariant elastic materials. Here, we overcome this limitation to design and fabricate a new class of polar materials with a distribution of body torque that exhibits asymmetric stresses. A static cloak for full two-dimensional elasticity is thus constructed based on the transformation method. The proposed cloak is made of a functionally graded multilayered lattice embedded in an isotropic continuum background. While one layer is tailored to produce a target elastic behavior, the other layers impose a set of kinematic constraints equivalent to a distribution of body torque that breaks the stress symmetry. Experimental testing under static compressive and shear loads demonstrates encouraging cloaking performance in good agreement with our theoretical prediction. The work sets a precedent in the field of transformation elasticity and should find applications in mechanical stress shielding and stealth technologies.

关键词： Classical mechanics

来源：评论

学校读者我要写书评

暂无评论

Anxiety, Post-COVID-19 Syndrome-Related Depression, and Suicidal Thoughts and Behaviors in COVID-19 Survivors: Cross-sectional Study

引用

JMIR Formative Research 2022年第10期6卷 e36656页

作者： Woodward, Sean F. Bari, Sumra Vike, Nicole Lalvani, Shamal Stetsiv, Khrystyna Kim, Byoung Woo Stefanopoulos, Leandros Maglaveras, Nicos Breiter, Hans Katsaggelos, Aggelos K. Department of Psychiatry and Behavioral Sciences Northwestern University Chicago IL United States Feinberg School of Medicine Northwestern University Chicago IL United States Department of Electrical and Computer Engineering Northwestern University Evanston IL United States Laboratory of Medical Informatics Aristotle University of Thessaloniki Thessaloniki Greece Laboratory of Neuroimaging and Genetics Department of Psychiatry Massachusetts General Hospital Harvard University Boston MA United States Department of Computer Science Northwestern University Evanston IL United States Department of Radiology Northwestern University Chicago IL United States

Background: Although the mental health impacts of COVID-19 on the general population have been well studied, studies of the long-term impacts of COVID-19 on infected individuals are relatively new. To date, depression, anxiety, and neurological symptoms associated with post-COVID-19 syndrome (PCS) have been observed in the months following COVID-19 recovery. Suicidal thoughts and behavior (STB) have also been preliminarily proposed as sequelae of COVID-19. Objective: We asked 3 questions. First, do participants reporting a history of COVID-19 diagnosis or a close relative having severe COVID-19 symptoms score higher on depression (Patient Health Questionnaire-9 [PHQ-9]) or state anxiety (State Trait Anxiety Index) screens than those who do not? Second, do participants reporting a COVID-19 diagnosis score higher on PCS-related PHQ-9 items? Third, do participants reporting a COVID-19 diagnosis or a close relative having severe COVID-19 symptoms score higher in STB before, during, or after the first year of the pandemic? Methods: This preliminary study analyzed responses to a COVID-19 and mental health questionnaire obtained from a US population sample, whose data were collected between February 2021 and March 2021. We used the Mann-Whitney U test to detect differences in the medians of the total PHQ-9 scores, PHQ-9 component scores, and several STB scores between participants claiming a past clinician diagnosis of COVID-19 and those denying one, as well as between participants claiming severe COVID-19 symptoms in a close relative and those denying them. Where significant differences existed, we created linear regression models to predict the scores based on COVID-19 response as well as demographics to identify potential confounding factors in the Mann-Whitney relationships. Moreover, for STB scores, which corresponded to 5 questions asking about 3 different time intervals (i.e., past 1 year or more, past 1 month to 1 year, and past 1 month), we developed repeated-meas

关键词： COVID-19 depression Patient Health Questionnaire-9 PHQ-9 post-COVID-19 syndrome STAI State Trait Anxiety Index suicidality

来源：评论

学校读者我要写书评

暂无评论

Multi-granularity ensemble sample selection and label correction for classification with noisy labels

引用

Applied Soft Computing 2025年 180卷

作者： Kecan Cai Hongyun Zhang Witold Pedrycz Duoqian Miao Chaofan Chen Department of Computer Science and Technology Tongji University Shanghai 201804 PR China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 201804 PR China Department of Electrical and Computer Engineering University of Alberta Edmonton AB T6G 2R3 Canada Systems Research Institute Polish Academy of Sciences 00-901 Warsaw Poland Istinye University Faculty of Engineering and Natural Sciences Department of Computer Engineering Sariyer/Istanbul Turkiye

Sample selection is crucial in classification tasks with noisy labels, yet most existing sample selection methods rely on a single criterion. These approaches often face challenges, including low purity of selected clean samples, and underfitting due to an insufficient number of selected clean training samples. To address these challenges, this paper proposes GNet-SSLC, a novel multi-granularity network framework that integrates multiple criteria ensemble sample selection (SS) and multiple views label correction (LC). In the SS phase, this paper proposes a metric learning-based dual k-Nearest Neighbor (k-NN) sample selection method. This method first uses corrected soft labels from the initial k-NN round to guide the selection of clean samples in the subsequent k-NN round. To further enhance selection accuracy, we combine this dual k-NN approach with a small loss sample selection technique through a voting mechanism. This multiple criteria ensemble method addresses the issues of low purity and instability inherent in single criterion approaches. In the LC phase, this paper designs a multiple views label correction framework that generates high-quality pseudo-labels for selected noisy samples. A key innovation of the framework is the design of a regularized contrastive learning loss, which optimizes the semi-supervised learning process by leveraging multiple views of training samples. The additional inclusion of training samples with high-quality pseudo-labels can effectively mitigate underfitting caused by a limited number of clean training samples. Experimental results on both synthetic and real-world noisy datasets indicate that GNet-SSLC enhances the purity and stability of the selected clean samples, and significantly improves classification performance. The enhancement is particularly notable with high noise rate dataset, such as CIFAR-100 dataset with 80% noise rate, achieving a 19.3% increase in classification accuracy compared to the baseline method.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The Round Complexity of Local Operations and Classical Communication (LOCC) in Random-Party Entanglement Distillation

arXiv

引用

arXiv 2022年

作者： Liu, Guangkuo George, Ian Chitambar, Eric Department of Physics University of Illinois at Urbana-Champaign UrbanaIL61801 United States JILA University of Colorado NIST BoulderCO80309 United States Department of Physics University of Colorado BoulderCO80309 United States Department of Electrical and Computer Engineering Coordinated Science Laboratory University of Illinois at Urbana-Champaign UrbanaIL61801 United States Center University of Illinois Urbana-Champaign UrbanaIL61801 United States

A powerful operational paradigm for distributed quantum information processing involves manipulating pre-shared entanglement by local operations and classical communication (LOCC). The LOCC round complexity of a given task describes how many rounds of classical communication are needed to complete the task. Despite some results separating one-round versus two-round protocols, very little is known about higher round complexities. In this paper, we revisit the task of one-shot random-party entanglement distillation as a way to highlight some interesting features of LOCC round complexity. We first show that for random-party distillation in three qubits, the number of communication rounds needed in an optimal protocol depends on the entanglement measure used;for the same fixed state some entanglement measures need only two rounds to maximize whereas others need an unbounded number of rounds. In doing so, we construct a family of LOCC instruments that require an unbounded number of rounds to implement. We then prove explicit tight lower bounds on the LOCC round number as a function of distillation success probability. Our calculations show that the original W-state random distillation protocol by Fortescue and Lo is essentially optimal in terms of round complexity. © 2022, CC BY.

关键词： Distillation

来源：评论

学校读者我要写书评

暂无评论

Editorial Introduction to the JSTQE Special Issue on Semiconductor Lasers

引用

IEEE Journal of Selected Topics in Quantum Electronics 2022年第1期28卷

作者： Capmany, José Gu, Qing Haglund, Åsa Klamkin, Jonathan Matsuo, Shinji Sciamanna, Marc The Photonics Research Labs Institute of Telecommunications and Multimedia Applications Universitat Politècnica de València Spain ECE Affiliated Faculty of Materials Science & Engineering The University of Texas DallasTX United States Photonics Laboratory Chalmers University of Technology Gothenburg Sweden Electrical and Computer Engineering Department UCSB Nanotech University of California Santa BarbaraCA United States NTT Photonics Laboratories NTT Device Technology Laboratories Atsugi Japan Centrale Supélec Campus de Metz Metz France

The papers in this special section focus on the topic of semiconductor lasers. Almost 60 years after their first demonstration this area of research remains one of the most active fields in photonics fueled both by the incorporation of new materials, structures and quantum effects as well as by the surge of novel applications that demand the unique properties of compactness, high-power, spectral richness and low linedwidth provided by these devices. These include communications, sensing, biophotonics and the more recent areas of lidar, optical beamforming, computing and quantum information systems. Each of them can leverage from the unique features of semiconductor lasers. The objective of this special section is to highlight recent progress, challenges and trends in innovative materials, geometries, modelling and applications of semiconductor lasers.

关键词： Special issues and sections Semiconductor lasers Semiconductor devices Laser stability Quantum cascade lasers Quantum dot lasers Vertical cavity surface emitting lasers

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：