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arXiv 2025年

作者： Cunningham, Gregory Ye, Yufeng Peng, Kaidong Yen, Alec Kedziora, Jessica O’Brien, Kevin P. Harvard John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States MIT Lincoln Laboratory LexingtonMA02421 United States

Single flux quantum technology has the potential to enhance readout and control of superconducting quantum systems due to their low energy consumption, high speed, and cryogenic operating temperatures. Current cryogenic readout and control typically requires microwave pulses of specific frequencies to travel between the room temperature control electronics and the cryogenic setup. Latency in control and readout can be improved by generating pulses within the dilution refrigerator. In this work, we consider a protocol for generating gigahertz frequency microwave tones from trains of DC-centered fluxons and fluxoids in Josephson transmission lines using the dynamics of breather formation, without room temperature synthesis or shunt / bias resistors. Simulations show that pulses with frequencies in the range of 15.2 to 21.5 GHz can be generated with maximal energy efficiency of 97% and bandwidth from 40 to 365 MHz. This protocol can also be used to generate gigahertz frequency Gaussian pulses. We detail metrics relevant to the control and readout of quantum systems such as input power, output power, and footprint. Copyright © 2025, The Authors. All rights reserved.

关键词： Josephson junction devices

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Trans-Msf: Monocular Scene Flow Estimation with Hierarchical Multi-Head

SSRN

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SSRN 2023年

作者： Xiang, Xuezhi Yang, Jie Cui, Yu Saddik, Abdulmotaleb El School of Information and Communication Engineering Harbin Engineering University Harbin150001 China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information Technology Harbin150001 China School of Electrical Engineering and Computer Science University of Ottawa OttawaONK1N 6N5 Canada

Scene flow estimation obtains 3D motion information of space objects through 2D plane projection, and it is possible to estimate scene information from monocular sequences. However, most previous innovation methods directly enhance the extraction of features, while ignoring to aggregate information from cost volume to achieve rich and compact representation. Therefore, we propose a monocular scene flow estimation network based on Hierarchical Multi-Head Self-Attention. First, the cost volume tokenization is processed in a hierarchical attention, which can effectively aggregate the information of cost volume and construct compact similarity expression. Secondly, adding the relative position encoding to the attention module is conducive to capturing long dependencies between tokens. Finally, depthwise over-parameterized convolution is used to increase the weight coefficient of the network. On the KITTI datasets, we evaluate the estimation of the optical flow and depth respectively to show the performance of the overall monocular scene flow estimation network. © 2023, The Authors. All rights reserved.

关键词： Aggregates

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MG-SLAM: Structure Gaussian Splatting SLAM with Manhattan World Hypothesis

arXiv

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arXiv 2024年

作者： Liu, Shuhong Deng, Tianchen Zhou, Heng Li, Liuzhuozheng Wang, Hongyu Wang, Danwei Li, Mingrui Department of Information Science and Technology Department of Complexity Science and Engineering The University of Tokyo Tokyo113-8654 Japan Institute of Medical Robotics Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education Shanghai200240 China Department of Mechanical Engineering Columbia University New York10027 United States School of Electrical and Electronic Engineering Nanyang Technological University Singapore Department of Computer Science Dalian University of Technology Dalian116024 China

Gaussian Splatting SLAMs have made significant advancements in improving the efficiency and fidelity of real-time reconstructions. However, these systems often encounter incomplete reconstructions in complex indoor environments, characterized by substantial holes due to unobserved geometry caused by obstacles or limited view angles. To address this challenge, we present Manhattan Gaussian SLAM, an RGB-D system that leverages the Manhattan World hypothesis to enhance geometric accuracy and completeness. By seamlessly integrating fused line segments derived from structured scenes, our method ensures robust tracking in textureless indoor areas. Moreover, The extracted lines and planar surface assumption allow strategic interpolation of new Gaussians in regions of missing geometry, enabling efficient scene completion. Extensive experiments conducted on both synthetic and real-world scenes demonstrate that these advancements enable our method to achieve state-of-the-art performance, marking a substantial improvement in the capabilities of Gaussian SLAM systems. © 2024, CC BY.

关键词： Gaussian distribution

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Manufacturing A Low-Cost Telegram and Optical Character Recognition-Based Indoor Air Quality Monitoring Data Logger

Manufacturing A Low-Cost Telegram and Optical Character Reco...

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International Conference on Information Management and Technology (ICIMTech)

作者： Andi Pramono Satrio Arif Budiman Muchammad Farchan Andi Baso Mappaturi Interior Design Department School of Design Bina Nusantara University Jakarta Indonesia Information System Computer Science Faculty Brawijaya University Malang Indonesia Department of Electrical Engineering Faculty of Intelligent Electrical and Informatics Technology Institut Teknologi Sepuluh Nopember Surabaya Indonesia Architecture Department Faculty of Science and Technology Islamic State University of Maulana Malik Ibrahim Malang Indonesia

Urban air is frequently contaminated with CO, CO2, VOC, HCHO, PM 2.5, and PM 10. Rural regions are at a lower risk than those near roads and industrial areas that produce emissions. Air pollutants negatively affect its inhabitants' health, particularly the respiratory system. Most people will spend more time indoors, requiring a method for monitoring indoor air quality (IAQ). Urban communities need IAQ monitoring instruments as an early warning system for their health. This research seeks to produce inexpensive IAQ that can be utilized by all levels of society, particularly urban communities. This research utilizes a qualitative, design-thinking-based methodology. The research diverged from Empatize, which asserts that urban communities require a method for determining the local air quality. Moreover, it is determined at the define stage that IAQ monitoring, which includes a data log feature, is still comparatively expensive, so a solution is developed at the ideate stage. Creating a prototype is the next step in realizing the specified solution. In this investigation, they decided to use IAQ monitoring, which is relatively inexpensive but lacks log data storage. The author uses the ESP32-cam microcontroller to capture the screen display device, and the resulting image is sent to a telegram and processed with optical character recognition (OCR) to generate a data log. The results of prototype testing are utilized for prototype development.

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Control of chirality and directionality of nonlinear metasurface light source via twisting

arXiv

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arXiv 2024年

作者： Zhou, Huanyu Ni, Xueqi Lou, Beicheng Fan, Shanhui Cao, Yuan Tang, Haoning Department of Electrical Engineering and Computer Science University of California at Berkeley BerkeleyCA94720 United States Department of Physics National University of Singapore Singapore119077 Singapore Department of Applied Physics and Ginzton Laboratory Stanford University StanfordCA94305 United States School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States

Metasurfaces have revolutionized nonlinear and quantum light manipulation in the past decade, enabling the design of materials that can tune polarization, frequency, and direction of light simultaneously. However, tuning of metasurfaces is traditionally achieved by changing their microscopic structure, which does not allow in situ tuning and dynamic optimization of the metasurfaces. In this Letter, we explore the concept of twisted bilayer and tetralayer nonlinear metasurfaces, which offer rich tunability in its effective nonlinear susceptibilities. Using gold-based metasurfaces, we demonstrate that a number of different singularities of nonlinear susceptibilities can exist in the parameter space of twist angle and interlayer gap between different twisted layers. At the singularities, reflected/transmitted light from the nonlinear process (such as second-harmonic generation) can either become circularly polarized (for C points), or entirely vanish (for V points). By further breaking symmetries of the system, we can independently tune all aspects of the reflected and transmitted nonlinear emission, achieving unidirectional emission with full-Poincaré polarization tunability, a dark state (V-V point), or any other bidirectional output. Our work paves the way for multidimensional control of polarization and directionality in nonlinear light sources, opening new avenues in ultrafast optics, optical communication, sensing, and quantum optics. © 2024, CC BY.

关键词： Quantum optics

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Holographic properties and display of photopolymer with high concentration photoinitiator doped with SiO2 Nanoparticles [Invited]

Holographic properties and display of photopolymer with high...

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Digital Holography and Three-Dimensional Imaging, DH 2021 - Part of OSA Imaging and Applied Optics Congress 2021

作者： Zhang, Yaping Chen, Huixin Zhang, Jingyuan Zhang, Yongan Yunnan Provincial Key Laboratory of Modern Information Optics Kunming University of Science and Technology Yunnan Kunming650500 China Bradley Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA24061 United States

Irgacure 784/PMMA polymers doped with SiO2 nanoparticles are studied. We have performed holographic display and measured diffraction efficiency with different concentrations of the photoinitiator with and without then... 详细信息

ISBN: (纸本)9781557528209

关键词： Silica nanoparticles

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Motion Prediction Based on sEMG- Transformer for Lower Limb Exoskeleton Robot Control

Motion Prediction Based on sEMG- Transformer for Lower Limb ...

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International Conference on advanced Robotics and Mechatronics (ICARM)

作者： Min Zeng Jason Gu Ying Feng AHU-IAI AI Joint Laboratory Anhui University Institute of Artificial Intelligence Hefei Comprehensive National Science Center Hefei China Department of Electrical and Computer Engineering Dalhousie University Halifax NS Canada College of Automation Science and Engineering South China University of Technology Guangzhou China

While lower limb exoskeleton robots can realize assisted walking by extracting the user's motion intention, it is difficult to effectively obtain the motion intention of the human body and convert it into information for the robot. In this paper, a novel model based on sEMG-Transformer is proposed for continuous motion prediction of multiple joint angles of lower limbs and applied to the developed lower limb exoskeleton robot. The sEMG-Transformer model can be used to extract the time series features from the sEMG sequences and establish the mapping between input data and multi-joint angle. Then, the predicted multi-joint angles are inputted into the developed lower limb exoskeleton robot. Experimental studies are performed with able-bodied human wearers and compared to existing methods, such as convolutional neural network (CNN), back propagation (BP), and long short-term memory (LSTM) networks. The motion intention estimation based on the sEMG-Transformer network has better estimation performance, which can effectively enable users to walk synchronously with the lower limb exoskeleton robot.

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Integrated Sensing and Communications Towards Proactive Beamforming in mmWave V2I via Multi-Modal Feature Fusion (MMFF)

arXiv

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arXiv 2023年

作者： Zhang, Haotian Gao, Shijian Cheng, Xiang Yang, Liuqing State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China Guangzhou511400 China Guangzhou511400 China Department of Electronic and Computer Engineering the Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Hong Kong

The future of vehicular communication networks relies on mmWave massive multi-input-multi-output antenna arrays for intensive data transfer and massive vehicle access. However, reliable vehicle-to-infrastructure links require exact alignment between the narrow beams, which traditionally involves excessive signaling overhead. To address this issue, we propose a novel proactive beamforming scheme that integrates multi-modal sensing and communications via Multi-Modal Feature Fusion Network (MMFF-Net), which is composed of multiple neural network components with distinct functions. Unlike existing methods that rely solely on communication processing, our approach obtains comprehensive environmental features to improve beam alignment accuracy. We verify our scheme on the Vision-Wireless (ViWi) dataset, which we enriched with realistic vehicle drifting behavior. Our proposed MMFF-Net achieves more accurate and stable angle prediction, which in turn increases the achievable rates and reduces the communication system outage probability. Even in complex dynamic scenarios with adverse environment conditions, robust prediction results can be guaranteed, demonstrating the feasibility and practicality of the proposed proactive beamforming approach. Copyright © 2023, The Authors. All rights reserved.

关键词： Beamforming

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Heterogeneous Integration of Lithium Niobate and Silicon Photonics for Nonlinear Optics

Heterogeneous Integration of Lithium Niobate and Silicon Pho...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Alexandra Maria Palici Xiyuan Lu Kartik Srinivasan Xinda Lu Fabien Labbe Yunhong Ding Hugo Laroque Ryan Hamerly Carlos Errando-Herranz Minhao Pu Dirk Englund Mikkel Heuck Department of Electrical and Photonics Engineering Technical University of Denmark Lyngby Denmark Microsystems and Nanotechnology Division Physical Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland USA Joint Quantum Institute NIST/University of Maryland College Park Maryland USA Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft Netherlands

We demonstrate a hybrid device consisting of a thin film lithium niobate membrane transfer-printed onto a silicon nitride ring resonator. We measure quality factors in the 10 5 range at telecom wavelengths.

ISBN: (纸本)9798350369311

关键词： Q-factor Lithium niobate Wavelength measurement Multichip modules Silicon nitride Ring lasers Silicon photonics Telecommunications Optical ring resonators Nonlinear optics

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advanced functional nanofibers:strategies to improve performance and expand functions

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Frontiers of Optoelectronics 2022年第4期15卷 125-143页

作者： Xinyu Chen Honghao Cao Yue He Qili Zhou Zhangcheng Li Wen Wang Yu He Guangming Tao Chong Hou School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518063China Department of Electrical Engineering and Computer Science Massachusetts Institute of TechnologyCambridge 02139USA

Nanofbers have a wide range of applications in many felds such as energy generation and storage,environmental sensing and treatment,biomedical and health,thanks to their large specifc surface area,excellent fexibility,and superior mechanical *** the expansion of application felds and the upgrade of application requirements,there is an inevitable trend of improving the performance and functions of *** the past few decades,numerous studies have demonstrated how nanofbers can be adapted to more complex needs through modifcations of their structures,materials,and ***,it is necessary to systematically review the feld of nanofbers in which new ideas and technologies are *** we summarize the recent advanced strategies to improve the performances and expand the functions of *** frst introduce the common methods of preparing nanofbers,then summarize the advances in the feld of nanofbers,especially up-to-date strategies for further enhancing their *** classify these strategies into three categories:design of nanofber structures,tuning of nanofber materials,and improvement of nanofbers ***,the optimization methods,materials,application areas,and fabrication methods are summarized,and existing challenges and future research directions are *** hope this review can provide useful guidance for subsequent related work.

关键词： Functional nanofber Nanofber fabrication Nanofber structure Nanofber materials Nanofber assembly

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