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arXiv 2023年

作者： Premillieu, Evolene Caravaca-Aguirre, Antonio M. Labouesse, Simon Irsch, Kristina Piestun, Rafael Department of Electrical Computer and Energy Engineering University of Colorado Boulder UCB 425 BoulderCO80309 United States Vision Institute - CNRS INSERM Sorbonne University 17 Rue Moreau Paris75012 France

Diffraction-limited imaging in epi-fluorescence microscopy remains a challenge when sample aberrations are present or when the region of interest rests deep within an inhomogeneous medium. Adaptive optics is an attractive solution albeit with limited field of view and requiring relatively complicated systems. Alternatively, reconstruction algorithms have been developed over the years to correct for aberrations. Unfortunately, purely post-processing techniques tend to be ill-posed and provide only incremental improvements in image quality. Here, we report a computational optical approach using unknown speckle illumination and matched reconstruction algorithm to correct for aberrations and reach or surpass diffraction limited resolution. The data acquisition is performed by shifting an unknown speckle pattern with respect to the fluorescent object. The method recovers simultaneously a high-resolution image, the point spread function of the system that contains the aberrations, the speckle illumination pattern, and the shift positions. Copyright © 2023, The Authors. All rights reserved.

关键词： Speckle

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Wide-field optical sizing of single nanoparticles with 10 nm accuracy

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Science China(Physics,Mechanics & Astronomy) 2021年第9期64卷 56-66页

作者： Yang Liu Yan Kuai Qiwen Zhan Joseph R.Lakowicz Douguo Zhang Advanced Laser Technology Laboratory of Anhui Province Department of Optics and Optical EngineeringUniversity of Science and Technology of ChinaHefei 230026China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Center for Fluorescence Spectroscopy Department of Biochemistry and Molecular BiologyUniversity of Maryland School of MedicineBaltimore 21201USA

There is an increasing demand for new technologies to rapidly measure individual nanoparticles in situ for applications,including early-stage diagnosis of human diseases and environmental ***,we demonstrate a label-free wide-field optical microscopy capable of sizing dispersed non-luminescent dielectric nanoparticles(with diameters down to 22 nm)with 10 nm *** technique utilizes enhanced nanoparticle-perturbed scattering by surface plasmons created on a gold *** the meantime,an azimuthal rotation illumination module is installed on this microscope and a differential image processing technique is carried *** relationship between the scattering intensity and the particle size was experimentally measured with good consistency with the theoretical *** capability of precise measurement of the size of dispersed nanoparticles within a larger field of view in a label-free,non-invasive and quantitative manner may find broad applications involving single nanoparticle chemistry and physics.

关键词： plasmonic microscopy label-free imaging single nanoparticle optical sizing imaging and sensing

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Electro-optic characterization of thin-film lithium niobate modulators at frequencies up to 325 GHz

Electro-optic characterization of thin-film lithium niobate ...

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2022 IEEE Region 10 International Conference, TENCON 2022

作者： Zhang, Yiwen Shao, Linbo Yang, Jingwei Chen, Zhaoxi Zhang, Ke Shum, Kam-Man. Zhu, Di Chan, Chi Hou Loncar, Marko Wang, Cheng City University of Hong Kong China Department of Electrical Engineering Hong Kong John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge United States Virginia Tech Usa Bradley Department of Electrical and Computer Engineering Virginia United States City University of Hong Kong China State Key Laboratory of THz and Millimeter Waves Hong Kong Singapore Singapore City of University Hong Kong China State Key Laboratory of THz and Millimeter Waves Department of Electrical Engineering Hong Kong

ISBN: (数字)9781665450959

ISBN: (纸本)9781665450959

We charaterize the mmWave-optic modulation performances of thin-film lithium niobate modulators at frequencies up to 325 GHz with a measured 3-dB electro-optic bandwidth of 170 GHz and a 6-dB bandwidth of 295 GHz. The device also shows a low RF half-wave voltage of 8.3 V measured at an ultrahigh modulation frequency of 250 GHz. © 2022 IEEE.

关键词： Bandwidth

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ISGW Characteristic Impedance Calculation Based on Conformal Mapping

ISGW Characteristic Impedance Calculation Based on Conformal...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Yuchao Sa Dongya Shen Jianpei Chen Xiupu Zhang Yunnan Provincial Engineering Laboratory of Cloud Wireless Access & Heterogeneous Networks Yunnan University Kunming China Department of Electrical and Computer Engineering iPhotonics Labs Concordia University Montreal Quebec Canada

Integrated Substrate Gap Waveguide (ISGW) is a newly proposed planar waveguide, which has the characteristics of low loss, easy integration and self-encapsulation, and is especially suitable for millimeter wave systems. Related waveguides have been widely used in the research and design of millimeter wave devices and antennas. However, no theoretical study has been made on the propagation characteristics of the waveguide, such as dispersion and characteristic impedance. Therefore, this paper will use conformal mapping method to study the characteristic impedance of ISGW waveguide.

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AgileWatts: An Energy-Efficient CPU Core Idle-State Architecture for Latency-Sensitive Server Applications 22

AgileWatts: An Energy-Efficient CPU Core Idle-State Architec...

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Proceedings of the 55th Annual IEEE/ACM International Symposium on Microarchitecture

作者： Jawad Haj Yahya Haris Volos Davide B. Bartolini Georgia Antoniou Jeremie S. Kim Zhe Wang Kleovoulos Kalaitzidis Tom Rollet Zhirui Chen Ye Geng Onur Mutlu Yiannakis Sazeides Rivos Inc Mountain View California United States Computer Architecture Laboratory Department of Computer Science University of Cyprus Computing Systems Lab Huawei Zurich Research Center Department of Information Technology and Electrical Engineering ETH Zurich Switzerland

ISBN: (纸本)9781665462723

User-facing applications running in modern datacenters exhibit irregular request patterns and are implemented using a multitude of services with tight latency requirements (30--250μs). These characteristics render existing energy-conserving techniques ineffective when processors are idle due to the long transition time (order of 100μs) from a deep CPU core idle power state (C-state). While prior works propose management techniques to mitigate this inefficiency, we tackle it at its root with AgileWatts (AW): a new deep CPU core C-state architecture optimized for datacenter server processors targeting latency-sensitive *** drastically reduces the transition latency from deep CPU core idle power states while retaining most of their power savings based on three key ideas. First, AW eliminates the latency (several microseconds) of saving/restoring the core context when powering-off/-on the core in a deep idle state by i) implementing medium-grained power-gates, carefully distributed across the CPU core, and ii) retaining context in the power-ungated domain. Second, AW eliminates the flush latency (several tens of microseconds) of the L1/L2 caches when entering a deep idle state by keeping L1/L2 content power-ungated. A small control logic also remains ungated to serve cache coherence traffic. AW implements cache sleep-mode and leakage reduction for the power-ungated domain by lowering a core's voltage to the minimum operational level. Third, using a state-of-the-art power efficient all-digital phase-locked loop (ADPLL) clock generator, AW keeps the PLL active and locked during the idle state, cutting microseconds of wake-up latency at negligible power *** evaluation with an accurate industrial-grade simulator calibrated against an Intel Skylake server shows that AW reduces the energy consumption of Memcached by up to 71% (35% on average) with <1% end-to-end performance degradation. We observe similar trends for other evaluated services (MySQL and Kafka).

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IRKO:An Improved Runge-Kutta Optimization Algorithm for Global Optimization Problems

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computers, Materials & Continua 2022年第3期70卷 4803-4827页

作者： R.Manjula Devi M.Premkumar Pradeep Jangir Mohamed Abdelghany Elkotb Rajvikram Madurai Elavarasan Kottakkaran Sooppy Nisar Department of Computer Science and Engineering Kongu Engineering CollegePerundurai638060Tamil NaduIndia Department of Electrical&Electronics Engineering Dayananda Sagar College of EngineeringBengaluru560078KarnatakaIndia Rajasthan Rajya Vidyut Prasaran Nigam Sikar332025RajasthanIndia Mechanical Engineering Department College of EngineeringKing Khalid UniversityAbha61421Saudi Arabia Mechanical Engineering Department Faculty of EngineeringKafrelsheikh UniversityEgypt Clean and Resilient Energy Systems(CARES)Laboratory Texas A&MUniversityGalveston77553TXUSA College of Arts and Sciences Prince Sattam bin Abdulaziz UniversityWadi Aldawaser11991Saudi Arabia

Optimization is a key technique for maximizing or minimizing functions and achieving optimal cost,gains,energy,mass,and so *** order to solve optimization problems,metaheuristic algorithms are *** of these techniques are influenced by collective knowledge and natural *** is no such thing as the best or worst algorithm;instead,there are more effective algorithms for certain ***,in this paper,a new improved variant of a recently proposed metaphorless Runge-Kutta Optimization(RKO)algorithm,called Improved Runge-Kutta Optimization(IRKO)algorithm,is suggested for solving optimization *** IRKO is formulated using the basic RKO and local escaping operator to enhance the diversification and intensification capability of the basic RKO *** performance of the proposed IRKO algorithm is validated on 23 standard benchmark functions and three engineering constrained optimization *** outcomes of IRKO are compared with seven state-of-the-art algorithms,including the basic RKO *** to other algorithms,the recommended IRKO algorithm is superior in discovering the optimal results for all selected optimization *** runtime of IRKO is less than 0.5 s for most of the 23 benchmark problems and stands first for most of the selected problems,including real-world optimization problems.

关键词： engineering design global optimization local escaping operator metaheuristics Runge-Kutta optimization algorithm

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A Multi-objective Optimization Approach for Secure Communications Based on Collaborative Beamforming in UAV Networks

A Multi-objective Optimization Approach for Secure Communica...

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IEEE Conference on Wireless Communications and Networking

作者： Xinrong Guo Fang Mei Geng Sun Tingting Zheng College of Software Jilin University Changchun China College of Computer Science and Technology Jilin University Changchun China Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun China College of Electrical and Computer Engineering University of Waterloo Waterloo Canada

With the rapid development of wireless communication, unmanned aerial vehicle (UAV) networks have received extensive attention and been applied in many fields, but some challenges exist in their applications, such as the issue of security when implementing communication. In this paper, a virtual antenna array (VAA) is formed in multiple UAV units using collaborative beamforming (CB) technology. Under the interference of multiple eavesdroppers, secure communication with the ground base station (BS) is achieved. To achieve better performance, we formulate a multi-objective optimization problem for UAV network security communication (SCMOP), and jointly optimize the positions and excitation current weights of UAVs to set the null values in the direction of known eavesdroppers, reduce the sidelobe levels (SLLs) and enhance the directivity of the main lobe (ML). Since the formulated SCMOP is an NP-hard problem, we propose an improved the third non-dominated sorting genetic algorithm (IMNSGA-III) with chaos operator and crossover and mutation operators to solve the problem in this paper. The simulation results show that the IMNSGA-III can solve the SCMOP well and obtain the best results compared with other benchmark algorithms.

关键词： Chaos Wireless communication Array signal processing Null value Collaboration Autonomous aerial vehicles Statistics

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Multi-Connectivity Mobility Management in Downlink FD-RAN: A Learning Based Approach

Multi-Connectivity Mobility Management in Downlink FD-RAN: A...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Tianqi Zhang Jianzhe Xue Jiwei Zhao Jiacheng Chen Haibo Zhou Xuemin Sherman Shen School of Electronic Science and Engineering Nanjing University Nanjing China Department of Mathematics and Theories Peng Cheng Laboratory Shenzhen China Department of Electrical and Computer Engineering University of Waterloo Waterloo Canada

We consider a fully-decoupled radio access network (FD-RAN), where base stations (BSs) are physically decoupled into control BSs, uplink BSs and downlink BSs, and multi-connectivity becomes the default user equipment (UE) association mode. Specifically, we study the inter-frequency multi-connectivity in downlink of FD-RAN and present a deep reinforcement learning based online multi-connectivity mobility management scheme. We formulate a UE dynamic multiple access problem and transform it into a handover decision problem, then apply the double deep Q-network (DDQN) algorithm to make real time mobility management decisions. Simulation results show that the proposed scheme outperforms benchmarks in terms of handover frequency and quality of service, while ensuring real-time performance.

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Adaptive Tracking Control of an Omnidirectional Mobile Robot System with Uncertainties and Disturbances

Adaptive Tracking Control of an Omnidirectional Mobile Robot...

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Annual Conference of Industrial Electronics Society

作者： Yaozhong Zhang Jiang Long Zitong Bai Wei Wang School of Automation Science and Electrical Engineering Beihang University Beijing China School of Computer Science Northwestern Polytechnical University Xi’ an China Zhongguancun Laboratory Beijing China

This paper addresses the tracking problem of an omnidirectional mobile robot (OMR), which is a second-order electromechanical system with unmatched uncertainties and disturbances. The control inputs are the currents of the motors, and the control objective is the tracking control of the real-time position and orientation for the robot. The main features of this paper are summarized as follows. (1) Both the kinematic and the dynamic models for a standard OMR are presented, which explicitly defines the unknown physical parameters of the system as well as the specific mathematical form of disturbances. (2) A new OMR control scheme is proposed based on adaptive back-stepping techniques. It is shown that the OMR can asymptotically track the desired trajectory with any orientation. (3) In addition to numerical simulations, a real OMR experiment platform is established. The effectiveness of the proposed control scheme has been verified with both simulation and experimental results.

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Design of ISGW Unequal Power Divider Based on Ultra-Wideband Metamaterial Absorber

Design of ISGW Unequal Power Divider Based on Ultra-Wideband...

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IEEE International Wireless Symposium (IWS)

作者： Hanfang Cui Dongya Shen Hong Yuan Yuchao Sa Xiupu Zhang Kaibo Kai Yunnan Provincial Engineering Laboratory of Cloud Wireless Access & Heterogeneous Networks Yunnan University Kunming China Department of Electrical and Computer Engineering iPhotonics Labs Concordia University Montreal Quebec Canada

This paper presents an effective method based on the concept of indium tin oxide (ITO) films designed metamaterial absorber to achieve unequal power divider. The structural unit of the proposed metamaterial absorber consists of three films, a foam dielectric substrate and a metallic copper. By properly adjusting the resonance of the structure, an optimized metamaterial absorption rate of greater than 90% from 21 to 35 GHz is achieved, and a strong absorption effect of ultra-broadband for incident electromagnetic waves at different polarization angles and different incidence angles is achieved, which is in good agreement with the numerical simulation results, and an equivalent circuit model is extracted to explain its operation mechanism. The designed metamaterial is loaded on an Integrated Substrate Gap Waveguide (ISGW) based power divider. Simulation results show that the 4:1 unequal power divider achieves a relative bandwidth of 24% in the operating band 22–28 GHz, and the isolation is better than 15dB, and the return loss is greater than 10dB.

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