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Multi-model Selection and Computation Resource Allocation Driven Cooperative Spectrum Sensing

IEEE Internet of Things Journal 2025年

作者： Wang, Qian Zhu, Dehao Qian, Li Ping Gu, Tingting Liang, Ying-Chang Kam, Pooi-Yuen Zhejiang University of Technology Institute of Cyberspace Security Hangzhou310023 China ZJUT Research Center of Electromagnetic Space Security Binjiang Institute of Artificial Intelligence Hangzhou310056 China Zhejiang University State Key Laboratory of CAD and CG College of Electrical Engineering Hangzhou310027 China Chengdu611731 China School of Science and Engineering Shenzhen518172 China Center for Advanced Microelectronic Devices Suzhou215123 China

Cooperative spectrum sensing (CSS) plays a crucial role in this era of explosive Internet of Things with scarce spectrum resources, since it can effectively enhance the sensing accuracy with the cooperation of secondary users (SUs). However, most existing CSS algorithms primarily focus on increasing the cooperative detection accuracy, while neglecting the computational complexity or sensing latency. Therefore, we propose a deep learning (DL) driven CSS scheme with the consideration of dynamic multi-model selection and suitable resource allocation. Specifically, we first derive the closed-form expressions to fit and characterize the detection and false alarm probabilities of three popular DL models, including the convolutional neural network, the long short-term memory (LSTM) network and the hybrid convolutional LSTM network. Then, the problem of minimizing the cooperative sensing error is formulated under the constrains of limited computational resource and sensing latency. Finally, the cross-entropy algorithm is employed to dynamically select the most suitable cooperating SU set and their correspondingly matched models, to balance the sensing accuracy and computational complexity. Simulation results demonstrate that our CSS scheme are much more robust and computationally efficient compared to some well-known CSS algorithms, especially in achieving extremely high sensing accuracy at low transmit power or low received signal-to-noise ratio. © 2014 IEEE.

关键词： Convolutional neural networks

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Three-Layer Matrix Ring Data Center Interconnect Based on FSO technology

Three-Layer Matrix Ring Data Center Interconnect Based on FS...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Jianning Su Qian Kong Xiaowei Lu Liming Liu Zichuan Yi Xinjian Pan School of Electronic and Information Engineering University of Electronic Science and Technology of China Zhongshan Institute Zhongshan China College of Physics and Optoelectronic Engineering Shenzhen University SZU Shenzhen China Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen Key Lab of Micro-Nano Photonic Information Technology State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen China

This paper proposes a three-layer grid matrix ring data center interconnect using Free Space Optical Communication as the inter-layer connection technology, which simplifies the wiring complexity and offers more diver... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Wiring Data centers Optical interconnections Free-space optical communication Asia Optical fiber networks Network architecture Routing Complexity theory Photonics

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A Low Noise 384×288 Uncooled Infrared Imager Based on Phase Difference Modulation

A Low Noise 384×288 Uncooled Infrared Imager Based on Phase...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Xueyou Shi Shanzhe Yu Guangyi Chen Yacong Zhang Zhongjian Chen Wengao Lu Key Laboratory of Microelectronic Devices and Circuits Peking University China Peking University Information Technology Institute (Tianjin Binhai) China

ISBN: (纸本)9781728192017;9781728192024

This paper presents an uncooled infrared imager with flicker noise reduction, which is realized by the proposed phase difference modulation (PDM) method. The PDM method makes noise transfer function (NTF) generate a series of notches to reduce flicker noise. To realize PDM, a high-speed sub-frame readout circuit is proposed. The readout circuit has been manufactured and the output data is processed with FPGA. The measurement results show that the flicker noise power in the frequency range above 10Hz is reduced by 42% compared with traditional method at 60fps full image output rate, and the noise equivalent temperature difference (NETD) is reduced from 40mK to 34mK.

关键词： Temperature measurement Power measurement Phase modulation Transfer functions Frequency measurement Noise measurement 1f noise

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Perpendicular magnetic anisotropy in as-deposited CoFeB/MgO thin films

arXiv

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arXiv 2022年

作者： Lou, Kaihua Xie, Tunan Zhao, Qianwen Jiang, Baiqing Xia, ChaoChao Zhang, Hanying Yao, Zhihong Bi, Chong Key Laboratory of Microelectronic Devices & Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China University of Chinese Academy of Sciences Beijing100049 China School of Microelectronics University of Science and Technology of China Hefei230026 China

Fabrication of perpendicularly magnetized ferromagnetic films on various buffer layers, especially on numerous newly discovered spin-orbit torque (SOT) materials to construct energy-efficient spin-orbitronic devices, is a long-standing challenge. Even for the widely used CoFeB/MgO structures, perpendicular magnetic anisotropy (PMA) can only be established on limited buffer layers through post-annealing above 300 °C. Here, we report that the PMA of CoFeB/MgO films can be established reliably on various buffer layers in the absence of post-annealing. Further results show that precise control of MgO thickness, which determines oxygen diffusion in the underneath CoFeB layer, is the key to obtaining the as-deposited PMA. Interestingly, contrary to previous understanding, post-annealing does not influence the well-established as-deposited PMA significantly but indeed enhances unsaturated PMA with a thick MgO layer by modulating oxygen distributions, rather than crystallinity or Co- and Fe-O bonding. Moreover, our results indicate that oxygen diffusion also plays a critical role in the PMA degradation at high temperature. These results provide a practical approach to build spin-orbitronic devices based on various high-efficient SOT materials. © 2022, CC BY.

关键词： Buffer layers

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High-speed readout for direct light orbital angular momentum photodetector via photoelastic modulation

arXiv

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arXiv 2025年

作者： Yang, Dehong Xu, Chang Lai, Jiawei Fan, Zipu Liang, Delang Wang, Shiyu Cheng, Jinluo Sun, Dong International Center for Quantum Materials School of Physics Peking University Beijing China Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices School of Physics Xi'an Jiaotong University Xi’an China Key Laboratory for Micro-Nano Physics and Technology of Hunan Province Hunan Institute of Optoelectronic Integration College of Materials Science and Engineering Hunan University Changsha China GPL Photonics Laboratory State Key Laboratory of Luminescence Science and Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun China Collaborative Innovation Center of Quantum Matter Beijing China Frontiers Science Center for Nano-optoelectronics School of Physics Beijing China

Recent progress in direct photodetection of light orbital angular momentum (OAM) based on the orbital photogalvanic effect (OPGE) provides an effective way for on-chip direct electric readout of orbital angular momentum, as well as large-scale integration focal-plane array devices. However, the recognition of OAM order from photocurrent response requires the extraction of circular polarization-dependent response. To date, the operation speed of such detector is currently at the minute level and is limited by slow mechanical polarization modulation and low OAM recognition capability. In this work, we demonstrate that the operation speed can be greatly improved via electrical polarization modulation strategy with photoelasitc modulator accompanied by phase-locked readout approach with lock-in amplifier. We demonstrate an operation speed of up to 1 kHz with this new technology in the mid-infrared region (4 μm) on an OAM detector using multilayer graphene (MLG) as photosensitive material. In principle, with new modulation and readout scheme, we can potentially increase the operation speed to 50.14 kHz with a PEM that operates at a state-of-the-art speed. Our work paves the way toward high-speed operation of direct OAM detection devices based on OPGE effect and pushes such technology to a more practical stage for focal plane array applications. Copyright © 2025, The Authors. All rights reserved.

关键词： Photodetectors

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Regulating Water Molecules via Bioinspired Covalent Organic Framework Membranes for Zn Metal Anodes

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Angewandte Chemie - International Edition 2025年第14期64卷 e202424184页

作者： Zhang, Sida Chen, Jiashu Chen, Weigen Su, Yiwen Gou, Qianzhi Yuan, Ruduan Wang, Ziyi Wang, Kaixin Zhang, Wentao Hu, Xiqian Zhang, Zhixian Wang, Pinyi Wan, Fu Liu, Jie Li, Beibei Wang, Yifei Zheng, Guangping Li, Meng Sun, Jingyu State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering National Innovation Center for Industry-Education Integration of Energy Storage Chongqing University Chongqing400044 China Soochow Institute for Energy and Materials Innovation Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou215006 China Department of Mechanical Engineering Hong Kong Polytechnic University Hung Hom Kowloon999077 Hong Kong MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials & Devices Joint Laboratory School of Energy and Power Engineering National Innovation Center for Industry-Education Integration of Energy Storage Chongqing University Chongqing400044 China School of Building Services Science and Engineering Xi'an University of Architecture and Technology Xi'an710055 China School of Electrical and Electronic Engineering Chongqing University of Technology Chongqing400054 China Hunan University Changsha410082 China College of Environmental Science and Engineering National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Beijing University of Technology Beijing100124 China

The Zn metal anode in aqueous zinc-ion batteries (AZIBs) faces daunting challenges including undesired water-induced parasitic reactions and sluggish ion migration kinetics. Herein, we develop three-dimensional covalent organic framework (COF) membranes with bioinspired ion channels toward stabilized Zn anodes. These COFs, featured by zincophilic pyridine-N sites, enable effective regulation of water molecules at the anode-electrolyte interphase. Systematic experimental analysis and theoretical simulations reveal the optimized COF-320N membrane functions as ion pumps, accordingly facilitating Zn2+ transport and inhibiting direct contact between Zn anode and free water molecules. Consequently, the bio-inspired strategy achieves improved Zn2+ transference number (0.61), rapid de-solvation kinetics, and suppressed hydrogen evolution. The assembled Zn||MnO2 pouch cell integrated with COF-320N membrane exhibits favorable electrochemical performances. Such a bioinspired concept for optimizing Zn anodes opens new pathways in developing advanced energy storage devices. © 2025 Wiley-VCH GmbH.

关键词： Manganese oxide

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Temperature-dependent Defect Behaviors in Ferroelectric Hf0.5Zr0.5O2 Thin Film: Re-wakeup Phenomenon and Underlying Mechanisms

Temperature-dependent Defect Behaviors in Ferroelectric Hf0....

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International Electron devices Meeting (IEDM)

作者： Xiaopeng Li Jixuan Wu Lu Tai Wei Wei Pengpeng Sang Yang Feng Bo Chen Guoqing Zhao Xuepeng Zhan Xiaolei Wang Masaharu Kobayashi Jiezhi Chen School of Information Science and Engineering Shandong University Qingdao China Key Laboratory of Microelectronic Devices and Integrated Technology Institute of Microelectronics of Chinese Academy of Sciences Beijing China Institute of Industrial Science the University of Tokyo Japan

ISBN: (纸本)9781665489607

Aiming at deep insights into the defect behaviors in the ferroelectric HZO thin film, we present a systematical study on the reliability property of $7\mathrm{~nm}$ HZO capacitor at the high-temperature range $(300\sim 420\mathrm{~K})$. For the first time, the rewakeup phenomenon is observed with cycling operation at high temperatures. By characterization on the switching time, fatigue rate, and leakage currents, the underlying defect-related mechanisms are discussed. It is considered that defects at grain boundaries could be an important reason because the trapped positive charge will induce the dipole pinning during the fatigue stage, but stronger electron injection (higher leakage) can release this pinning and cause the re-wakeup phenomenon. Our results strongly indicate that grain boundary engineering could be the key to ultra-thin HZO optimizations.

关键词： Temperature measurement Grain boundaries Temperature distribution Solid modeling Capacitors Fatigue Data models

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Bioinspired oxygen-locking property electrocatalysts enable highly efficient electrochemical ozone production for sea sand desalination

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Journal of Energy Chemistry 2025年 107卷 929-938页

作者： Zhaoyu Chen Ben Zhang Shuyan Lu Guanfeng Xue Qianzhi Gou Jiacheng Wang Ruduan Yuan Juanxiu Xiao Li Li John Wang Meng Li National Innovation Center for Industry-Education Integration of Energy Storage Technology MOE Key Laboratory of Low-Grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials & Devices Joint Laboratory School of Energy & Power Engineering Chongqing University Chongqing 400044 China Southwest Technology and Engineering Research Institute Chongqing 400039 China State Key Laboratory of Marine Resource Utilization in South China Sea School of Marine Science and Engineering Hainan University Haikou Hainan 570228 China National Key Laboratory of Special Power Supplies National-Municipal Joint Engineering Laboratory for Chemical Process Intensification and Reaction School of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 China Department of Materials Science and Engineering National University of Singapore Singapore 117573 Singapore National University of Singapore (Chongqing) Research Institute Chongqing 401123 China

Electrochemical ozone (O 3 ) production (EOP) faces a critical challenge due to the competitive oxygen evolution reaction (OER), which severely limits ozone yields. Inspired by the oxygen-binding mechanism of heme, we designed a biomimetic catalyst, FePP@SnO 2 @CA, by electrodepositing iron porphyrin (FePP) onto SnO 2 @CA nanosheets, endowing it with an “oxygen-locking property” to suppress competing OER. This catalyst demonstrates exceptional EOP performance, achieving an ozone production rate of 8.9 mmol cm −2 h −1 and a Faraday efficiency (FE) of 20.46% ± 1.6%. DFT calculations confirm that Fe–O 2 interactions stabilize O 2 * intermediates, redirecting the reaction pathway from OER to ozone generation and reducing the O–O coupling energy barrier, thereby enabling thermodynamic selectivity control. In addition, when FePP@SnO 2 @CA is used as a dual-functional material for sea sand desalination, the chlorine removal efficiency can reach 52.7%. This work provides a novel bioinspired strategy for EOP catalyst design and broadens the application potential of FePP@SnO 2 @CA in sustainable technologies.

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Experimental Investigation of Ultra-Low Temperature LA2O3/HFO2 Bi-Layer Dipole-First Process Using PVD Method for Advanced IC technology

Experimental Investigation of Ultra-Low Temperature LA2O3/HF...

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China Semiconductor technology International Conference (CSTIC)

作者： Yanzhao Wei Jiaxin Yao Renren Xu Qingzhu Zhang Huaxiang Yin Integrated Circuit Advanced Process R&D Center Institute of Microelectronics Chinese Academy of Sciences Beijing China School of Integrated Circuits University of Chinese Academy of Sciences Beijing China Key Laboratory of Microelectronic Devices and Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing China

In this paper, a La 2 O 3 /HfO 2 bi-layer dipole-first (DF) process is proposed and investigated by ultra-low temperature PVD dielectric laminates to achieve lower gate effective work function (EWF) for monolithic 3D-IC (M3D) application. The impacts of ultra-low temperature La-dipole on EWF modulation and interfacial properties are comprehensively investigated. It is found that the flat-band voltage (V FB ) negatively shifts 60 mV with sub-1nm La 2 O 3 thickness, which provides an effective way to meet the require of Si conduction band-edge EWF modulation. Furthermore, the electron trap/detrap densities (Not) and interfacial trap densities (Dit) are suppressed by La 2 O 3 /HfO 2 bi-layer DF process to improve device performance. These results exhibit a promising bi-layer DF process in low thermal integration for advanced IC technology.

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Design of an Ultra-Low Modulus 3D Printed Titanium Bio-Metamaterials for Bone Replacement

Additive Manufacturing Frontiers

引用

Additive Manufacturing Frontiers 2025年第1期4卷

作者： Song, Facheng Wang, Leilei Zhang, Yihan Qiu, Jian Luo, Jing Wang, Ling Li, Dichen State Key Laboratory for Manufacturing System Engineering School of Mechanical Engineering Xi'an Jiaotong University Xi'an 710054 China Shaanxi Ruiyi Medical Technology Co.Ltd. Xi'an 710300 China National Medical Products Administration (NMPA) Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices Xi'an Jiaotong University Xi'an 710054 China National Innovation Platform (Center) for Industry-Education Integration of Medical Technology Xi'an Jiaotong University Xi'an 710054 China

Porous designs effectively reduce stress shielding in metallic orthopedic implants. However, current porous structures often fail to adequately meet the needs of patients with osteoporosis and low-modulus body regions. This study proposes a sinusoidal-based lattice structure for an ultralow and widely tunable modulus design, aiming to match diverse bone tissue requirements and enhance biomechanical compatibility. Parametric modeling and finite element analysis were used to evaluate the performance of this structure. Results show that, within the design range suitable for bone growth, the elastic modulus of this lattice structure is tunable over a wide range, from 0.09 to 32.67 GPa, outperforming existing porous structures. The lowest value closely matched the minimum mechanical properties of human cancellous bone among porous structures. Moreover, the structure exhibited distinct anisotropic characteristics, allowing for directional design based on mechanical requirements. The structure's permeability ranged from 1.19 × 10^–8 m² to 2.3 × 10^–7 m², making it highly compatible with human cancellous bone and meeting the requirements of orthopedic implants. Samples with porosities ranging from 46 % to 87 % were successfully fabricated using powder bed fusion additive manufacturing, validating the simulation predictions. This tunable low-modulus lattice structure provides a novel approach for developing personalized orthopedic implants, particularly for patients with specialized needs such as osteoporosis, and can potentially enhance biomechanical compatibility and long-term stability. © 2025

关键词： Additive manufacturing Bio-metamaterial Bone scaffold Lattice structure Low modulus

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