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arXiv 2024年

作者： Chen, Hanqi Yu, Lixing Zhan, Shaojie Yao, Penghui Shao, Jiankun School of Information Science and Engineering Yunnan University Yunnan Key Laboratory of Intelligent Systems and Computing Yunnan China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing China

The computational inefficiency of spiking neural networks (SNNs) is primarily due to the sequential updates of membrane potential, which becomes more pronounced during extended encoding periods compared to artificial neural networks (ANNs). This highlights the need to parallelize SNN computations effectively to leverage available hardware parallelism. To address this, we propose Membrane Potential Estimation Parallel Spiking Neurons (MPE-PSN), a parallel computation method for spiking neurons that enhances computational efficiency by enabling parallel processing while preserving the intrinsic dynamic characteristics of SNNs. Our approach exhibits promise for enhancing computational efficiency, particularly under conditions of elevated neuron density. Empirical experiments demonstrate that our method achieves state-of-the-art (SOTA) accuracy and efficiency on neuromorphic datasets. Codes are available at https://***/chrazqee/MPE-PSN. © 2024, CC BY.

关键词： Neurons

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A new approach for evaluating regional permafrost changes:A case study in the Hoh Xil on the interior Qinghai‒Tibet Plateau

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Advances in Climate Change Research 2024年第6期15卷 1040-1056页

作者： Yu-Xin ZHANG Lin ZHAO Chang-Wei XIE Guo-Jie HU Shu-Hua YANG De-Fu ZOU Yong-Ping QIAO Xiang-Fei LI Jia-Jie PENG School of Geographical Sciences Nanjing University of Information Science&Technology(NUIST)Nanjing 210044China Cryosphere Research Station on the Qinghai‒Tibet Plateau Key Laboratory of Cryospheric Science and Frozen Soil EngineeringNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Environmental Sciences Nanjing Xiaozhuang UniversityNanjing 211171China

The current spatial atmospheric forcing data cannot accurately depict the actual conditions of the Qinghai–Tibet Plateau(QTP),where monitoring stations are scarce and unevenly *** deficiency in atmospheric data hinders accurate simulation of plateau permafrost changes on the *** this study,we develop a new approach to evaluate regional permafrost changes,which does not rely on spatially distributed meteorological data but instead uses the regional climate change processes or temperature change *** on a transient heat conduction permafrost model,this approach was applied to the Qinghai Hoh Xil National Nature Reserve(referred to as Hoh Xil)within the QTP from 1960 to 2015,using the rate of air temperature change provided by the Wudaoliang Meteorological Station,the only national station in Hoh *** results showed that the difference between the simulated and observed change rates of mean annual ground temperature(MAGT)was less than 0.04℃ per decade from 2001 to 2015 at five long-term monitoring *** simulated ground temperature profiles in four boreholes from various permafrost zones revealed an error of less than 0.7℃ below 5 m in *** validation demonstrates the reliability of this approach for predicting long-term permafrost *** regional permafrost changes were further simulated based on the latest warming scenarios(BCC-CSM2-MR)from the Coupled Model Intercomparison Project Phase *** revealed significant differences in the regional permafrost degradation rate under different climate warming *** the most severe warming scenario(SSP5-8.5),permafrost in the study area is projected to still cover 72.2%of the total area by 2100,with most of the Hoh Xil's permafrost becoming warm(MAGT>−1℃)*** approach not only facilitates the simulation of frozen ground changes in areas with few meteorological monitoring stations but also provides a new perspective for using coarse-resolutio

关键词： Numerical modelling Permafrost change Forcing data Hoh Xil

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Sensitivity analysis of carbon dioxide inversion in near-infrared spectra for TanSat-2 satellite 3

Sensitivity analysis of carbon dioxide inversion in near-inf...

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3rd International Conference on Remote Sensing, Surveying, and Mapping, RSSM 2024

作者： Bai, Zhaoming Wang, Xiaolin Gao, Peng Liu, Dongdong Fan, Meng Ai, Jingjing Shandong Engineering Research Center of New Optoelectronic Information Technology and Devices School of Mathematics and Physics Qingdao University of Science and Technology Qingdao266061 China School of Science Xi’an Polytechnic University Shaanxi Xi’an710048 China State Key Laboratory of Remote Sensing Science Aerospace Information Research Institute Chinese Academy of Sciences Beijing100101 China

ISBN: (数字)9781510680081

ISBN: (纸本)9781510680074

The inherent uncertainties of input parameters in satellite may affect the inversion accuracy of the column-averaged dry-air mole fractions of carbon dioxide (XCO2). Regarding the design specifications of the next-generation carbon satellite (Tansat-2), a sensitivity analysis is conducted on seven input parameters that may affect the XCO2 inversion. The paper employs the SCIATRAN model to retrieve XCO2 from short-wave infrared spectra with central the wavelengths at 0.76 μm and 1.61 μm. The results indicate that, considering the uncertainties in measuring these parameters, the parameters influencing XCO2 inversion are ranked in the following order: the pressure, oxygen, temperature, water vapor, surface elevation, surface albedo, and ozone. To achieve the XCO2 inversion accuracy within the range of 0.3%-0.5%, it is necessary to ensure the temperature uncertainty of approximately 0.4 K-0.8 K, the pressure uncertainty of approximately 0.2%-0.4%, the water vapor uncertainty of approximately 7%-14%, the oxygen uncertainty of approximately 0.25%-0.5%, along with the surface albedo uncertainty of approximately 0.2-0.4, and the surface elevation uncertainty of approximately 22.5 m-45 m. © 2024 SPIE.

关键词： Sensitivity analysis

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Tunable Silicon Ring Resonator with Wavelength-scale Radius at 2-μm Waveband

Tunable Silicon Ring Resonator with Wavelength-scale Radius ...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Wu, You Wang, Xi Zhang, Zimeng Du, Jiangbing Song, Qinghai Xu, Ke Department of Electronic and Information Engineering Harbin Institute of Technology Shenzhen518055 China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China Department of Science Harbin Institute of Technology Shenzhen518055 China

A tunable silicon photonic microring resonator with radius of 2 μm is demonstrated at 2-μm waveband. Ultra-large free spectral range of 75.312 nm and extinction ratio of 23.93 dB are achieved. © Optica Publishi... 详细信息

ISBN: (纸本)9781957171258

关键词： Silicon photonics

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Application of EEG and EMG Signals in Multi-Classification of Epilepsy 5

Application of EEG and EMG Signals in Multi-Classification o...

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5th IEEE International Conference on Pattern Recognition and Machine Learning, PRML 2024

作者： Liang, Jiahui Wang, Guangming Jia, Shanshan Wang, Dong Wang, Gang Xi'an Jiaotong University Key Laboratory of Biomedical Information Engineering Ministry of Education School of Life Science and Technology Xi'an China Xi'an Children's Hospital Department of Neurology Xi'an China

ISBN: (纸本)9798350355925

The classification of epileptic seizures is crucial for the treatment of epilepsy, and currently, this task primarily relies on clinical doctors, which is complex and time-consuming. Our study aims to perform an eight-category classification of epileptic seizures using multi-domain features from electroencephalogram (EEG) and electromyogram (EMG) signals, combined with deep learning algorithms. In this research, EEG signals are decomposed via the Variational Mode Decomposition (VMD) method and features are extracted in the time domain, frequency domain, and from information theory, while EMG signals are processed to extract relevant features directly. Following feature fusion, the Resnet model is employed for classification. Under the evaluation criteria based on seizure events and across subjects, the accuracy of the eight-category classification of seizures is 75%, with a weighted F1 score of 0.75, where the accuracy and recall for Tonic-Clonic Seizures are 100%. Moreover, in this task, we also compared the classification effects using only EEG signals and using both EEG and EMG signals, as well as the performance differences between machine learning models and deep learning models. The results indicate that the classification performance is optimized when both EEG and EMG signals are used in conjunction with a neural network model. © 2024 IEEE.

关键词： Frequency domain analysis

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Tutorial on laser-based visible light communications[Invited]

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Chinese Optics Letters 2024年第9期22卷 126-136页

作者： Yuqi Hou Yue Wang Zengxin Li Meixin Liu Shulan Yi Xiaoqian Wang Liang Xia Guangyi Liu Jianyang Shi Ziwei Li Junwen Zhang Nan Chi Tien Khee Ng Boon S.Ooi Chao Shen Key Laboratory for Information Science of Electromagnetic Waves Ministry of EducationSchool of Information Science and TechnologyFudan UniversityShanghai 200433China ZGC Institute of Ubiquitous-X Innovation and Applications Beijing 100876China Photonics Laboratory Electrical and Computer EngineeringDivision of ComputerElectrical and Mathematical Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia China Mobile Research Institute Beijing 100876China

Facing escalating demands for high-speed,large-bandwidth,and low-latency wireless data links,laser communication technology has emerged as a promising *** free-space optical communication conventionally utilizes nearinfrared light sources,there has been growing interest in exploring new spectral resources,including visible ***,laser-based white light has been demonstrated in visible light communication(VLC),with a unique capability to seamlessly integrate with illumination and display *** review summarizes the key devices and system technologies in semiconductor-laser-based white light for VLC-related *** recent advances and many emerging applications in the evolution of lighting,display,and communication are discussed.

关键词： visible light communication LiFi laser lighting GaN laser semiconductor laser

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Fast Microwave Near-Field Phase Retrieval Based on Improved Diffraction Neural Networks 7

Fast Microwave Near-Field Phase Retrieval Based on Improved ...

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7th IEEE International Conference on Electronic information and Communication technology, ICEICT 2024

作者： Li, Ying Deng, Li Chen, Lijie Beijing University of Posts and Telecommunications School of Information and Communication Engineering Beijing100871 China China Ship Development and Design Center Science and Technology on Electromagnetic Compatibility Laboratory Wuhan430064 China

ISBN: (纸本)9798350384437

This paper presents a fast microwave near-field phase retrieval method based on an Improved Diffraction Neural Network (IDNN). The method first modifies the Rayleigh-Sommerfeld (RS) formula using the angular spectrum method to adapt it for the Phase Retrieval (PR) equation. By enhancing the output layer of the DNN to simultaneously provide amplitude and phase information and incorporating a backward phase iteration step, the accuracy of phase retrieval is significantly improved. The optimization process leverages a custom-designed loss function and the Adam optimizer for gradient descent, enabling the retrieval of phase information using only amplitude data from two plane measurements. Simulation results validate the effectiveness of this approach and demonstrate its advantages in speed compared to classical algorithms such as the Gerchberg-Saxton (GS) algorithm and the Truncated Amplitude Flow (TAF) algorithm. © 2024 IEEE.

关键词： Microwave measurement

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Enrichment of anchoring sites by introducing supramolecular halogen bonds for the efficient perovskite nanocrystal LEDs

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Light(science & Applications) 2023年第10期12卷 2122-2130页

作者： Po Lu Ting Li Min Lu Cheng Ruan Siqi Sun Zhennan Wu Yuan Zhong Fujun Zhang Yanbo Gao Yaowei Huang Yang Wang Junhua Hu Fengping Yan Yu Zhang State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering Jilin UniversityChangchunChina School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijingChina Changchun Cedar Electronics Technology Co. Ltd.ChangchunChina Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchunChina Key Laboratory of Materials Physics of Ministry of Education Department of Physics and Engineering Zhengzhou UniversityZhengzhouChina

Considering the multi-functionalization of ligands,it is crucial for ligand molecular design to reveal the landscape of anchoring ***,a typical triphenylphosphine(TPP)ligand was employed to explore its effect on the surface of CsPbI_(3)perovskite nanocrystals(PNCs).Except for the conventionally considered P-Pb coordination,an P-I supramolecular halogen bonding was also found on the NC *** coexistence of the above two types of bonding significantly increased the formation energy of iodine vacancy defects and improved the photoluminescence quantum yield of PNCs up to 93%.Meanwhile,the direct interaction of P and I enhanced the stability of the Pb-I octahedra and dramatically inhibited the migration of I ***,the introduction of additional benzene rings(2-(Diphenylphosphino)-biphenyl(DPB))increased the delocalized properties of the PNC surface and significantly improved the charge transport of the *** a result,the DPB passivated CsPbI_(3)NCs based top-emitting LEDs exhibite a peak external quantum efficiency(EQE)of 22.8%,a maximum luminance of 15,204 cd m^(−2),and an extremely low-efficiency roll-off of 2.6%at the current density of 500 mA cm^(−2).

关键词： halo bonding quantum

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Multi-Attention Fusion and Fine-Grained Alignment for Bidirectional Image-Sentence Retrieval in Remote Sensing

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IEEE/CAA Journal of Automatica Sinica 2022年第8期9卷 1532-1535页

作者： Qimin Cheng Yuzhuo Zhou Haiyan Huang Zhongyuan Wang School of Electronic Information and Communications Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China School of Computer Science Wuhan UniversityWuhan 430079China

Dear editor,Cross-modal retrieval in remote sensing(RS) data has inspired increasing enthusiasm due to its merit in flexible input and efficient query. In this letter, we address to establish semantic relationship bet... 详细信息

关键词： editor Remote Image

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8th International Congress on Edge Computing, EDGE 2024, Held as Part of the Services Conference Federation, SCF 2024

作者： Tian, Yun Wu, Bin Shi, Jiaoli Zhang, Caicai Xu, Du School of Computer and Big Data Science Jiujiang University Jiujiang332005 China Jiujiang Key Laboratory of Network and Information Security Jiujiang332005 China School of Modern Information Technology Zhejiang Polytechnic University of Mechanical and Electrical Engineering Hangzhou310053 China

ISBN: (纸本)9783031770685

The development of cloud computing and the widespread application of cloud services have made outsourcing services more convenient. The need for individuals and businesses to store and manipulate the graph data they generate is growing rapidly. The unreliability and insecurity of cloud servers make outsourcing graph data a great risk of information leakage. To effectively protect data security, encrypting outsourced data is a useful method. The adjacent vertex query is a very commonly used and fundamental operation, and similarity search is a widely used and powerful tool to improve the scope and functionality of queries. After outsourcing encrypted sparse graph data to cloud servers, it becomes very inconvenient to use and manipulate the data. In this work, we present a scheme to realize the adjacent vertex query supporting similarity search on sparse graph data in cloud environment (SSAQ), which also protects the security of the information. This work uses edit distance and the searchable encryption principle to construct query index, and next implement the similar adjacent vertex query on cloud server. This work provides a formal security analysis, and also gives the experimental comparison and analysis. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： information leakage

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