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Chinese Journal of Electronics 2023年第2期32卷 237-247页

作者： ZHANG Zheng ZHANG Zhuoran ZHANG Fangguo School of Computer Science and Engineering Sun Yat-sen University Guangdong Province Key Laboratory of Information Security Technology

The pattern-matching problem with wildcards can be formulated as a conjunction where an accepting string is same as the pattern for all non-wildcards. A scheme of conjunction obfuscation is a algorithm that “encrypt” the pattern to prevent some adversary from forging any accepting string. Since 2013, there are abundant works about conjunction obfuscation which discussed with weak/strong functionality preservation and distributed black-box security. These works are based on generic group model, learning with error assumption,learning with noise assumption, etc. Our work proposes the first conjunction obfuscation with strong functionality preservation and distributed black-box security from a standard assumption. Our scheme with some parameter constraints can also resist some related attacks such as the information set decoding attack and the structured error arrack.

关键词： Computers Quantum computing Computational modeling Closed box Resists Linear codes Mathematical models

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Adjustable patch and feature prior token-based transformer for weakly supervised semantic segmentation

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International Journal of Computers and Applications 2024年第7期46卷 445-454页

作者： Li, Linjuan Zhang, Haoxue Xie, Gang Bai, Yanhong School of Electronic and Information Engineering Taiyuan University of Science and Technology Taiyuan China Shanxi Key Laboratory of Advanced Control and Equipment Intelligence Taiyuan China

Weakly supervised semantic segmentation is a challenging task, utilizing only low-cost weak supervision to produce pixel-level predictions. Existing transformer-based methods for weakly supervised semantic segmentation have some limitations: (1) Fixing patch size might destroy the structured semantics, which is unfriendly to objects of different scales, and (2) Ignoring the prior features when using multi-head attention mechanisms might lead to inaccurate segmentation localization. To tackle these issues, we proposed an effective transformer framework coupled with the adjustable patch and prior feature tokens, termed as APFPformer, in which an adjustable patch module is developed to split the image according to the area of the salient object for preserving the structured semantics in patches. A prior feature token module is devised to exploit the edge and texture information as prior tokens, ensuring the gain of discriminative representation. Additionally, a single-stage scheme is applied to reduce the computation and rapid segmentation process. Our experiments demonstrate the superiority of our approach over early methods, gaining competitive mean Intersection-over-Union scores of 67.9% on the PASCAL VOC2012 dataset and 40.2% on the MS COCO dataset. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Semantic Segmentation

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Layered double hydroxide-derived Mg_(2)Ni/TiH_(1.5)composite catalysts for enhancing hydrogen storage performance of MgH_(2)

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Journal of Magnesium and Alloys 2024年第12期12卷 4966-4975页

作者： Gang Huang Yao Lu Xiaofang Liu Wukui Tang Xinyu Li Feng Wang Jianglan Shui Ronghai Yu School of Materials Science and Engineering Beihang UniversityNo.37 Xueyuan RoadBeijing 100191PR China School of Materials Science and Engineering&Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004PR China

Developing efficient catalysts is of great significance in improving the sluggish kinetics and high desorption temperature of Mg H_(2)hydrogen storage ***,ultrathin Ni Ti-layered double hydroxide(Ni Ti-LDH)nanosheets are used as precursors to prepare Mg_(2)Ni/TiH_(1.5)composite catalysts to improve the hydrogen storage properties of MgH_(2).The variation of Ni/Ti ratio in LDH plays an important role in regulating the composition,morphology and distribution of Mg_(2)Ni/Ti H_(1.5)catalysts,which significantly affect their synergistic catalytic ***_(2)Ni/TiH_(1.5)composite catalyst exhibits significantly improved catalytic performance compared with conventional Ni-,Ti-and Ni/Ti-based *** optimal Mg H_(2)/Mg_(2)Ni/TiH_(1.5)system shows a significantly reduced desorption temperature of 212℃which is 133℃lower than that of pure MgH_(2)(345℃),and can release 5.97 wt%hydrogen within 300s at 300℃.Further mechanism analysis reveals that the unique flaky morphology and suitable composition of Ni/Ti LDH can significantly enhance the synergistic effect of Mg_(2)Ni and TiH_(1.5),which promotes the fracture of the H–H and Mg-H bonds.

关键词： Hydrogen storage materials MgH_(2) Layered double hydroxides Nanocatalysts

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Back-stepping Recursive Decentralized Finite-time Trajectory Tracking Control for Space Parallel Robots with a Bricard Mechanism

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IEEE Transactions on Aerospace and Electronic systems 2025年第3期61卷 7512-7526页

作者： Guo, Chuandong Liu, Fei Hu, Quan Sichuan University of Science and Engineering School of Automation and Information Engineering Yibin644005 China Artificial Intelligence Key Laboratory of Sichuan Province Yibin644005 China Beijing Institute of Aerospace Systems Engineering Beijing100076 China Beijing Institute of Technology Beijing100081 China

A space parallel robot with a Bricard mechanism (SPRBM) is an mechanism for space debris removal. In contrast to traditional serial manipulators, the SPRBM can capture targets of arbitrary shapes, provided the target's envelope falls within the capture range of the SPRBM's net port, with no stringent requirements on the capture point's location. Additionally, owing to the properties of parallel mechanisms, the SPRBM can capture targets possessing greater motion energy than traditional serial manipulators. However, the SPRBM has complicated dynamics, posing significant challenges for dynamic modeling and trajectory tracking control. In this study, we introduce a back-stepping recursive decentralized finite-time control scheme for the trajectory tracking control of the SPRBM. First, the equation of motion for the SPRBM was derived using a recursive algorithm. Then, the back-stepping recursive decentralized finite-time control was formulated, assuming that communication between the decentralized controllers was feasible. The communicated information comprised the relative motion states at the joints, the geometry and mass parameters, and the control torques. Finally, numerical experiments were conducted to validate the effectiveness of the proposed control scheme. © 2025 IEEE.

关键词： Space debris

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Hydrogel electrodes with conductive and substrate-adhesive layers for noninvasive long-term EEG acquisition

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Microsystems & Nanoengineering 2023年第3期9卷 357-370页

作者： Hailing Xue Dongyang Wang Mingyan Jin Hanbing Gao Xuhui Wang Long Xia Dong’ang Li Kai Sun Huanan Wang Xufeng Dong Chi Zhang Fengyu Cong Jiaqi Lin Key State Laboratory of Fine Chemicals School of BioengineeringDalian University of Technology116024 DalianChina School of Biomedical Engineering Faculty of Electronic Information and Electrical EngineeringDalian University of Technology116024 DalianChina Key Laboratory of Energy Materials and School of Materials Science and Engineering Dalian University of Technology116024 DalianChina

Noninvasive brain–computer interfaces (BCIs) show great potential in applications including sleep monitoring, fatigue alerts, neurofeedback training, etc. While noninvasive BCIs do not impose any procedural risk to users (as opposed to invasive BCIs), the acquisition of high-quality electroencephalograms (EEGs) in the long term has been challenging due to the limitations of current electrodes. Herein, we developed a semidry double-layer hydrogel electrode that not only records EEG signals at a resolution comparable to that of wet electrodes but is also able to withstand up to 12 h of continuous EEG acquisition. The electrode comprises dual hydrogel layers: a conductive layer that features high conductivity, low skin-contact impedance, and high robustness;and an adhesive layer that can bond to glass or plastic substrates to reduce motion artifacts in wearing conditions. Water retention in the hydrogel is stable, and the measured skin-contact impedance of the hydrogel electrode is comparable to that of wet electrodes (conductive paste) and drastically lower than that of dry electrodes (metal pin). Cytotoxicity and skin irritation tests show that the hydrogel electrode has excellent biocompatibility. Finally, the developed hydrogel electrode was evaluated in both N170 and P300 event-related potential (ERP) tests on human volunteers. The hydrogel electrode captured the expected ERP waveforms in both the N170 and P300 tests, showing similarities in the waveforms generated by wet electrodes. In contrast, dry electrodes fail to detect the triggered potential due to low signal quality. In addition, our hydrogel electrode can acquire EEG for up to 12 h and is ready for recycled use (7-day tests). Altogether, the results suggest that our semidry double-layer hydrogel electrodes are able to detect ERPs in the long term in an easy-to-use fashion, potentially opening up numerous applications in real-life scenarios for noninvasive BCI.

关键词： conductive electrode impedance

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Additive Noise Model Structure Learning Based on Spatial Coordinates

IEEE Transactions on Artificial Intelligence

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IEEE Transactions on Artificial Intelligence 2024年第8期5卷 3858-3871页

作者： Yang, Jing Lu, Ting Zhu, Youjie Hefei University of Technology Intelligent Interconnected Systems Laboratory of Anhui Province Hefei230009 China Hefei University of Technology School of Computer Science and Information Engineering Hefei230009 China

Discovering causal relationships from a large amount of observational data is an important research direction in data mining. To address the challenges of discovering and constructing causal networks on nonlinear and high-dimensional data, this article proposes a new structural learning algorithm called spatial coordinates based (SCB). The SCB algorithm effectively discovers causal networks from large scale nonlinear data. In this article, we make three main contributions. Firstly, based on the Hilbert-Schmidt independence criterion (HSIC), we propose new independence test coefficients: spatial coordinate (SC) coefficient and conditional spatial coordinate (CSC) coefficient. We also prove that the statistical distribution of the CSC coefficient follows a standard normal distribution. Secondly, using the statistical distribution of the CSC coefficient, we redefine the correlation of variables and combine it with local learning to propose the SCB algorithm. Finally, we demonstrate the effectiveness of the algorithm through experiments on data generated from various nonlinear function dependencies. Compared to existing algorithms, the causal network models constructed using the SCB algorithm exhibit significant improvements in accuracy and time performance. The effectiveness of the proposed method is further validated on real power plant data. © 2020 IEEE.

关键词： Additive noise

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Near-Lossless Compression of Two Independent Binary Sources with One Encoder 16

Near-Lossless Compression of Two Independent Binary Sources ...

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16th International Conference on Wireless Communications and Signal Processing, WCSP 2024

作者： Zhu, Tingting Ma, Xiao Sun Yat-sen University School of Computer Science and Engineering MoE Key Laboratory of Information Technology Guangdong Key Laboratory of Information Security Technology Guangzhou China

ISBN: (纸本)9798350390643

In this paper, we consider the near-lossless compression of two distinct but independent binary random sources U and V, both of which are asymmetrical independent and identically distributed (i.i.d.) sources. In particular, V is assumed to be sparser than U. We show that, to efficiently compress U and V, explicit source coding (compression) for V (the sparser one) is not required. The basic idea is to encode U with an error-correction code and then superimpose V on the codeword. Hence, only one encoder-decoder pair (EDP) suffices to compress two sources. Theoretical analysis shows that the proposed coding scheme is entropy-approaching in terms of bit-error rate (BER) of both sources, and numerical results verify our analysis. Furthermore, we analyze the complexity of compression using the block Markov superposition transmission-repetition (BMST-R) codes to discuss the advantage of the proposed scheme. Simulation results demonstrate that the proposed scheme compresses the two sources simultaneously in a more compact way but causes no performance degradation. © 2024 IEEE.

关键词： Convolutional codes

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A spawning particle filter for defocused moving target detection in GNSS-based passive radar

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Journal of systems engineering and Electronics 2023年第5期34卷 1085-1100页

作者： ZENG Hongcheng DENG Jiadong WANG Pengbo ZHOU Xinkai YANG Wei CHEN Jie School of Electronic and Information Engineering Beihang UniversityBeijing 100191China National Key Laboratory of Science and Technology on Space Microwave China Academy of Space TechnologyXi’an 710000China

Global Navigation Satellite System(GNSS)-based passive radar(GBPR)has been widely used in remote sensing ***,for moving target detection(MTD),the quadratic phase error(QPE)introduced by the non-cooperative target motion is usually difficult to be compensated,as the low power level of the GBPR echo signal renders the estimation of the Doppler rate less ***,the moving target in GBPR image is usually defocused,which aggravates the difficulty of target detection even *** this paper,a spawning particle filter(SPF)is proposed for defocused ***,the measurement model and the likelihood ratio function(LRF)of the defocused point-like target image are ***,a spawning particle set is generated for subsequent target detection,with reference to traditional particles in particle filter(PF)as their *** that,based on the PF estimator,the SPF algorithm and its sequential Monte Carlo(SMC)implementation are proposed with a novel amplitude estimation method to decrease the target state ***,the effectiveness of the proposed SPF is demonstrated by numerical simulations and pre-liminary experimental results,showing that the target range and Doppler can be estimated accurately.

关键词： Global Navigation Satellite System(GNSS)-based passive radar(GBPR) defocused target moving target detec-tion(MTD) likelihood ratio function(LRF) spawning particle fil-ter(SPF)

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H_(2)O_(2) treatment boosts activity of NiFe layered double hydroxide for electro-catalytic oxidation of urea

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Journal of Environmental sciences 2023年第7期129卷 152-160页

作者： Jinshan Wei Jin Wang Xiaoming Sun College of Materials Science and Engineering Key Laboratory of Optoelectronic Devices and SystemsCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China

Urea oxidation reaction(UOR)provides a method for hydrogen production besides wastewater treatment,but the current limited catalytic activity has prevented the ***,we develop a novel H_(2)O_(2) treatment strategy for tailoring the surface oxygen ligand of NiFe-layered double hydroxides(NiFe-LDH).The sample after H_(2)O_(2) treatment(NiFeOLDH)shows significant enhancement on UOR efficiency,with the potential of 1.37 V(RHE)to reach a current density of 10 mA/cm^(2).The boost is attributed to the richness adsorption O ligand on NiFeO-LDH as revealed by XPS and Raman *** calculation indicates formation of two possible types of oxygen ligands:adsorbed oxygen on the surface and exposed from hydroxyl group,lowered the desorption energy of CO_(2) product,which lead to the lowered onset *** strategy is further extended to NiFe-LDH nano sheet on Ni foam to reach a higher current density of 440 mA/cm^(2) of UOR at 1.8 V(RHE).The facile surface O ligand manipulation is also expected to give chance to many other electro-catalytic oxidations.

关键词： NiFe-LDH Urea oxidation reaction H_(2)O_(2)treatment Electro-catalysis Hydrogen production

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Design high-performance narrowband emitters for blue light-emitting diodes through manipulating resonance structure of aromatic heterocycles

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science China Chemistry 2025年第6期68卷 2652-2659页

作者： Yue Yu Lei Xu Wenle Tan Yuyu Pan Jiyin Xiao Bohan Wang Guangjun Tian Yuguang Ma Lei Ying Institute of Polymer Optoelectronic Materials and Devices Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials State Key Laboratory of Luminescent Materials and Devices South China University of Technology School of Petrochemical Engineering Shenyang University of Technology Key Laboratory for Microstructural Material Physics of Hebei Province School of Science Yanshan University

Narrowband light-emitting materials play critical roles in improving the color gamut and energy consumption of electroluminescence. Herein we demonstrated that by regulating the ground state resonance structure form of emitters with polycyclic aromatic heterocycles, the high-energy vibration of the C–C bond can be effectively suppressed, resulting in narrow emission like classical cyanine dyes. The designed compounds consist of twist and planar conformation, while having differences in the orientation of the positioning electron-donating(nitrogen) and electron-accepting(carbonyl) groups in the polycyclic aromatic hydrocarbon skeleton. The resulting compound Ac-Ph-Ac with a dominated zwitterionic resonance structure exhibits a relatively wide electroluminescent profile with the full width at half maximum(FWHM) of 42 nm and moderate device performance. In contrast, the “soliton transition” of 2Ac Ph based on the cyanine limit character effectively suppresses C–C stretching vibration in the polycyclic aromatic heterocycle skeleton, leading to a narrow electroluminescent profile with FWHM of 30 nm(0.16 e V)associated with an impressively high external quantum efficiency of 28.52%, which is among the highest efficiencies of so far reported non-sensitized organic light-emitting diodes.

关键词： narrowband emission organic light-emitting diodes aromatic heterocycles resonance structure cyanine limit

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