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arXiv 2021年

作者： Dong, Zhenxing Cao, Hong Shen, Wang Gan, Yu Ling, Yuye Zhai, Guangtao Su, Yikai John Hopcroft Center for Computer Science Shanghai Jiao Tong University China Institute of Image Communication and Network Engineering Shanghai Jiao Tong University China Department of Electrical and Computer Engineering University of Alabama TuscaloosaAL35401 United States State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University China

Current learning-based single image super-resolution (SISR) algorithms underperform on real data due to the deviation in the assumed degradation process from that in the real-world scenario. Conventional degradation processes consider applying blur, noise, and downsampling (typically bicubic downsampling) on high-resolution (HR) images to synthesize low-resolution (LR) counterparts. However, few works on degradation modelling have taken the physical aspects of the optical imaging system into consideration. In this paper, we analyze the imaging system optically and exploit the characteristics of the real-world LR-HR pairs in the spatial frequency domain. We formulate a real-world physics-inspired degradation model by considering both optics and sensor degradation;The physical degradation of an imaging system is modelled as a low-pass filter, whose cut-off frequency is dictated by the object distance, the focal length of the lens, and the pixel size of the image sensor. In particular, we propose to use a convolutional neural network (CNN) to learn the cutoff frequency of real-world degradation process. The learned network is then applied to synthesize LR images from unpaired HR images. The synthetic HR-LR image pairs are later used to train an SISR network. We evaluate the effectiveness and generalization capability of the proposed degradation model on real-world images captured by different imaging systems. Experimental results showcase that the SISR network trained by using our synthetic data performs favorably against the network using the traditional degradation model. Moreover, our results are comparable to that obtained by the same network trained by using real-world LR-HR pairs, which are challenging to obtain in real scenes. © 2021, CC BY.

关键词： Cutoff frequency

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Reconfigurable Intelligent Surface Assisted High-Speed Train communications: Coverage Performance Analysis and Placement Optimization

arXiv

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arXiv 2023年

作者： Liu, Changzhu He, Ruisi Niu, Yong Han, Zhu Ai, Bo Gao, Meilin Ma, Zhangfeng Wang, Gongpu Zhong, Zhangdui The State Key Laboratory of Advanced Rail Autonomous Operation The School of Electronics and Information Engineering The Frontiers Science Center for Smart High-speed Railway System The Beijing Engineering Research Center of High-Speed Railway Broadband Mobile Communications Beijing Jiaotong University Beijing100044 China The State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong University Beijing100044 China The National Mobile Communications Research Laboratory Southeast University Nanjing211189 China The Department of Electrical and Computer Engineering The University of Houston HoustonTX77004 United States The Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of Henan Joint International Research Laboratory of Intelligent Networking and Data Analysis Zhengzhou University Zhengzhou450001 China Research Center of Networks and Communications Peng Cheng Laboratory Shenzhen China The Tsinghua Space Center the Beijing National Research Center for Information Science and Technology Tsinghua University Beijing100091 China The College of Information Engineering Shaoyang University Shaoyang422000 China The Beijing Key Lab of Transportation Data Analysis and Mining School of Computer and Information Technology Beijing Jiaotong University Beijing100044 China

Reconfigurable intelligent surface (RIS) emerges as maximization problem is formulated to facilitate RIS discrete an efficient and promising technology for the next wireless phase design and RIS placement optimization, which is subject generation networks and has attracted a lot of attention owing to coverage probability constraint. Simulation results validate to the capability of extending wireless coverage by reflecting that better coverage performance and higher travel distance signals toward targeted receivers. In this paper, we consider can be achieved with deployment of RIS. The impacts of some a RIS-assisted high-speed train (HST) communication system key system parameters including transmission power, signal-to-to enhance wireless coverage and improve coverage probability. noise ratio threshold, number of RIS elements, number of RIS First, coverage performance of the downlink single-input-single- quantization bits, horizontal distance between base station and output system is investigated, and the closed-form expression RIS, and speed of HST on system performance are investigated. of coverage probability is derived. Moreover, travel distance In addition, it is found that RIS can well improve coverage probability with limited power consumption for HST communications. Copyright © 2023, The Authors. All rights reserved.

关键词： Railroads

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An Efficient EPIST Algorithm for Global Placement with Non-Integer Multiple-Height Cells *

An Efficient EPIST Algorithm for Global Placement with Non-I...

引用

Design Automation Conference

作者： Jianli Chen Zhipeng Huang Ye Huang Wenxing Zhu Jun Yu Yao-Wen Chang State Key Lab of ASIC & System Fudan University China Center for Discrete Mathematics and Theoretical Computer Science Fuzhou University Fuzhou China Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

ISBN: (数字)9781728110851

ISBN: (纸本)9781728158020

With the increasing design requirements of modern circuits, a standard-cell library often contains cells of different row heights to address various trade-offs among performance, power, and area. However, maintaining all standard cells with integer multiples of a single-row height could cause some area overheads and increase power consumption. In this paper, we present an analytical placer to directly consider a circuit design with non-integer multiple-height standard cells and additional layout constraints. The region of different cell heights is adaptively generated by the global placement result. In particular, an exact penalty iterative shrinkage and thresholding (EPIST) algorithm is employed to efficiently optimize the global placement problem. The convergence of the algorithm is proved, and the acceleration strategy is proposed to improve the performance of our algorithm. Compared with the state-of-the-art works, experimental results based on the 2017 CAD Contest at ICCAD benchmarks show that our algorithm achieves the best wirelength and area for every benchmark. In particular, our proposed EPIST algorithm provides a new direction for effectively solving large-scale nonlinear optimization problems with non-smooth terms, which are often seen in real-world applications.

关键词： Standards Optimization Clustering algorithms Libraries Circuit synthesis Benchmark testing Iterative algorithms

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Hamiltonian Path Based Mixed-Cell-Height Legalization for Neighbor Diffusion Effect Mitigation

Hamiltonian Path Based Mixed-Cell-Height Legalization for Ne...

引用

Design Automation Conference

作者： Jianli Chen Ziran Zhu Qinghai Liu Yimin Zhang Wenxing Zhu Yao-Wen Chang State Key Lab of ASIC & System Fudan University Shanghai China Center for Discrete Mathematics and Theoretical Computer Science Fuzhou University Fuzhou China Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

ISBN: (数字)9781728110851

ISBN: (纸本)9781728158020

In modern circuit designs, standard cells are designed with different heights based on the power, area, and other characteristics to address various design requirements. For those cells with different heights, in particular, there are inter-cell diffusion steps if the diffusion heights of neighboring cells are different, called the neighbor diffusion effect (NDE) which has become critical in advanced technology nodes. In this paper, we present a Hamiltonian-path-based mixed-cell-height legalization algorithm for NDE mitigation. We first present a row assignment method considering both cell displacements and diffusion steps to assign cells to their desired rows that meet the power-rail alignment constraints. Then, we propose a Hamiltonian-path-based diffusion-step reduction method to effectively reduce the NDE violations while preserving the global placement solution. Particularly, we develop a 2-approximation algorithm to find a minimum weight Hamiltonian path connecting two vertices, and a 1.5-approximation algorithm to find a minimum weight Hamiltonian path with a specified end vertex. Finally, we present an NDE-aware legalization method with design compaction to resolve overlaps and NDE violations. Experimental results show that our algorithm can resolve all NDE violations without any area overhead in reasonable runtime.

关键词： Approximation algorithms Circuit synthesis Compaction Runtime Heuristic algorithms Standards Graph theory

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Directly wireless communication of human minds via non-invasive brain-computer-metasurface platform

arXiv

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arXiv 2022年

作者： Ma, Qian Gao, Wei Xiao, Qiang Ding, Lingsong Gao, Tianyi Zhou, Yajun Gao, Xinxin Yan, Tao Liu, Che Gu, Ze Kong, Xianghong Abbasi, Qammer H. Li, Lianlin Qiu, Cheng-Wei Li, Yuanqing Cui, Tie Jun Institute of Electromagnetic Space Southeast University Nanjing210096 China School of Automation Science and Engineering South China University of Technology Guangzhou510641 China State Key Laboratory of Millimeter Wave Southeast University Nanjing210096 China Center of Intelligent Metamaterials Pazhou Laboratory Guangzhou510330 China Research Center for Brain-Computer Interface Pazhou Lab Guangzhou510330 China Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore University of Glasgow James Watt School of Engineering GlasgowG12 8QQ United Kingdom State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University Beijing100871 China

Brain-computer interfaces (BCIs), invasive or non-invasive, have projected unparalleled vision and promise for assisting patients in need to better their interaction with the surroundings. Inspired by the BCI-based rehabilitation technologies for nerve-system impairments and amputation, we propose an electromagnetic brain-computer-metasurface (EBCM) paradigm, regulated by human's cognition by brain signals directly and non-invasively. We experimentally show that our EBCM platform can translate human's mind from evoked potentials of P300-based electroencephalography to digital coding information in the electromagnetic domain non-invasively, which can be further processed and transported by an information metasurface in automated and wireless fashions. Directly wireless communications of the human minds are performed between two EBCM operators with accurate text transmissions. Moreover, several other proof-of-concept mind-control schemes are presented using the same EBCM platform, exhibiting flexibly-customized capabilities of information processing and synthesis like visual-beam scanning, wave modulations, and pattern encoding. © 2022, CC BY.

关键词： Electrophysiology

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Magnetostrictive-Assisted Whispering Gallery Mode Sensors

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Photonic Sensors 2025年第3期15卷

作者： Guan, Jianqing Yang, Zhenning Yu, Hang Wang, Zhe Tang, Xiaohe Zhao, Qianchuan Wang, Chuan Zhao, Guangming Li, Ming Zhang, Jing Department of Automation Tsinghua University Beijing100084 China School of Automation Science and Engineering Xi’an Jiaotong University Xi’an710049 China MOE Key Lab for Intelligent Networks and Network Security Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Optoelectronic Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100190 China School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing100049 China School of Artificial Intelligence Beijing Normal University Beijing100875 China

Whispering gallery mode (WGM) microresonators emerged as a promising platform for highly sensitive sensing applications due to their high-quality factors and small mode volumes. They offer the advantages of the ultrahigh sensitivity and compact size, rendering them suitable across multiple fields. A stable encapsulation process is essential for practical applications to establish a reliable coupling system between the microcavity and its waveguide coupler, especially for the microtoroidal resonator and tapered fiber coupler. However, adjusting the coupling coefficient after the packaging process poses challenges, thereby compromising coupling accuracy and limiting its range of applications. It is imperative to provide a platform of tunable coupling for packaged WGM resonators. Here, we provide an approach for leveraging the magnetostrictive effect to dynamically regulate the fiber-cavity coupling, enabling the measurement of the magnetic field as an example. Moreover, we show the fine-tuning of coupling within the packaged WGM microresonator, allowing the precision control of the optomechanical effect. Through this method, a tunable coupling platform in a packaged system is realized, opening up new dimensions of research in various fields. © The Author(s) 2025.

关键词： Magnetostriction

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Towards green mobile edge computing offloading systems with security enhancement

arXiv

引用

arXiv 2020年

作者： Sun, Haijian Wang, Qun Ma, Xiang Xu, Yongjun Hu, Rose Qingyang Department of Computer Science University of Wisconsin-Whitewater WhitewaterWI United States Electrical and Computer Engineering Department Utah State University LoganUT United States School of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing400065 China Shandong Provincial Key Lab of Wireless Communication Technologies Shandong University Jinan250100 China

Mobile edge computing (MEC) is an emerging communication scheme that aims at reducing latency. In this paper, we investigate a green MEC system under the existence of an eavesdropper. We use computation efficiency, which is defined as the total number of bits computed divided by the total energy consumption, as our main metric. To alleviate stringent latency requirement, a joint secure offloading and computation model is proposed. Additionally, we formulate an optimization problem for maximizing computation efficiency, under several practical constraints. The non-convex problem is tackled by successive convex approximation and an iterative algorithm. Simulation results have verified the superiority of our proposed scheme, as well as the effectiveness of our problem solution. Copyright © 2020, The Authors. All rights reserved.

关键词： Mobile edge computing

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Electron Beam Lithography: CO2-Based Dual-Tone Resists for Electron Beam Lithography (Adv. Funct. Mater. 13/2021)

引用

Advanced Functional Materials 2021年第13期31卷

作者： Xin-Yu Lu Hao Luo Kai Wang Yao-Yao Zhang Xiao-Feng Zhu Dongxue Li Bingze Ma Shisheng Xiong Paul F. Nealey Qiang Li Guang-Peng Wu MOE Laboratory of Macromolecular Synthesis and Functionalization Adsorption and Separation Materials and Technologies of Zhejiang Province Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou 310027 China Pritzker School of Molecular Engineering University of Chicago Chicago IL 60637 USA Materials Science Division Argonne National Laboratory 9700 S Cass Avenue Argonne IL 60439 USA School of Information Science and Technology Fudan University Shanghai 200433 China State Key Lab of ASIC and System School of Microelectronics Fudan University Shanghai 200433 China

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Beyond Fourier transform: Break the axial resolution limit in optical coherence tomography

arXiv

引用

arXiv 2020年

作者： Ling, Yuye Wang, Mengyuan Gan, Yu Yao, Xinwen Schmetterer, Leopold Zhou, Chuanqing Su, Yikai John Hopcroft Center for Computer Science Shanghai Jiao Tong University Shanghai China Department of Electrical and Computer Engineering University of Alabama AL United States Singapore Institute for Health Technologies Nanyang Technological University Singapore Singapore Eye Research Institute Singapore National Eye Centre Singapore School of Chemical and Biomedical Engineering Nanyang Technological University Singapore Institute of Biomedical Engineering Shenzhen Bay Lab Shenzhen China School of Biomedical Engineering Shanghai Jiao Tong University Shanghai China State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China

Optical coherence tomography (OCT) is a volumetric imaging modality that empowers clinicians and scientists to noninvasively visualize and examine the microscopic cross-sectional architectures of biological samples. By taking advantage of the coherence gating, OCT could achieve micrometer-level axial sectioning with high sensitivity. In the past decade, substantial efforts have been made to push the axial resolution of Fourier-domain OCT (FD-OCT) further into the sub-micron regime by physically extending the system's spectral bandwidth. Here, we offer a new perspective on this problem with the help of a new theoretical framework. We identified a key limitation on the reconstruction's axial resolution, which is induced by the Fourier transform-based reconstruction algorithm. To break this limit, we presented a novel optimization-based algorithm to recover the super-resolution image from ordinary FD-OCT measurements with proper physical assumptions. To prove the concept, we retrieved images at a resolution higher than the theoretical prediction in both phantoms and biological samples. Copyright © 2020, The Authors. All rights reserved.

关键词： Optical tomography

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Bandwidth-efficient visible light communication system based on faster-than-Nyquist pre-coded CAP modulation

引用

Chinese Optics Letters 2017年第8期15卷 6-11页

作者：迟楠赵嘉琦王智鑫 State Key Lab of ASIC Department of Communication Science and Engineering Fudan University Shanghai 200433 China

With the rapid development of the light-emitting diode （LED） industry, interest in visible light communication （VLC） is growing. The limited bandwidth of commercial LEDs is one of the main challenges to achieve high- speed VLC. In this Letter, a kind of bandwidth-efficient VLC system based on carrierless amplitude and phase （CAP） modulation is proposed, where a simple differential faster-than-Nyquist （FTN） pre-coding scheme is em- ployed to compress the spectrum and further improve the overall system baud rate. The system is experimentally demonstrated with a data rate of 1.47-Cb/s over 1.5 m free space transmission. The results indicate that an improvement of 80 Mbaud is achieved by FTN-CAP4 at 20% subband overlap and 40 Mbaud rate improvement by FTN-CAP16 at 7.5% subband overlap. Compared with traditional CAP, the FTN pre-coded CAP shows a better performance in spectral efficiency （SE） and intercarrier interference resistance. To the best of our knowl- edge, it is the first time to employ FTN pre-coded CAP in indoor high-data-rate VLC systems.

关键词： CAP high FTN VLC than

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