检索结果-内蒙古大学图书馆

An Wavelet Steered network for efficient infrared small target detection

Infrared physics and Technology 2025年 148卷

作者： Ma, Teng Cheng, Kuanhong Chai, Tingting Wu, Yubo Zhou, Huixin School of Computer Science and Engineering Xi'an University of Technology Shaanxi Province Xi'an710048 China Shandong Province Weihai264209 China School of Physics Xidian University Shaanxi Province Xi'an710071 China

This paper introduces an innovative approach for infrared small target detection (IRSTD). Our model is primarily motivated by the integration of Discrete Wavelet Transform (DWT) into a convolutional neural network (CNN), combining the classical multi-scale analysis method with the deep learning (DL) framework. Firstly, it is argued that detail loss may be induced by downsampling operations such as average or maximize pooling, and the interpolation of upsampling is inefficient in increasing useful information. Therefore, Haar DWT and inverse DWT (IDWT) are embedded for lossless downsampling and upsampling, facilitating more effective feature extraction within the CNN. Secondly, a hybrid attention mechanism, referred to as Wavelet Steered Transformer (WST), is designed to fully enhance the DWT features both spatially and across channels. This mechanism consists of two key improvements: (1) Channel-wise Transformer: We propose adapting a channel-wise Transformer to enhance semantic information and suppress background clutter and noise. This enhancement ensures that the targets and background features are distributed across different channels, thereby boosting detection performance. (2) Dilated-Gate Convolutional Module: A dilated-gate convolutional module is employed to enhance spatial location accuracy. Unlike previous methods for location extraction, this module uses a combination of different kernel sizes and dilation rates to improve spatial accuracy. Experimental results on benchmark datasets showcase the supervisor performance of the proposed method. The code and data for this paper will be released at https://***/Fortuneteller6/WaveTD once the paper is accepted. © 2025 Elsevier B.V.

关键词： Image reconstruction

来源：评论

学校读者我要写书评

暂无评论

Morphogenic Shape Grammars for the Design of engineering Structures

Morphogenic Shape Grammars for the Design of Engineering Str...

引用

Computational Intelligence on engineering/Cyber Physical Systems (CIES), IEEE Symposium on

作者： Simon Hickinbotham Edgar Buchanan Peter Kilpatrick Mark Price Andy M. Tyrrell School of Physics Engineering & Technology University of York York UK School of Electronics Electrical Engineering & Computer Science Queen's University Belfast Belfast UK School of Mechanical & Aerospace Engineering Queen's University Belfast Belfast UK

ISBN: (数字)9798331508272

ISBN: (纸本)9798331508289

Bodies of multicellular organisms are laid out according to morphogens: chemical agents which establish a coordinate system in the early embryo and use this to decide where body parts should grow. This process offers a mechanism for the automation of the design of engineering constructs via evolutionary search in a similar manner to the way biological evolution has driven the diversity of body forms of life on Earth. There are many ways of encoding such body plans, but the main existing approaches have problems around managing the complexity and stability of the evolutionary search process, particularly when applied to practical engineering design problems. This contribution takes the notion of morphogen chemical gradients and uses it to develop a novel grammar for shape formation. The central idea is to organise and label the spatial sub-regions of a design before making decisions regarding the finished arrangement of structure. This makes it much simpler to explore compositions of the hierarchy of sub-assemblies in a design, and to represent design of shape in an evolvable manner. A worked example of such a morphogenic shape grammar is described, and used in a multi-objective evolutionary search for optimal bridge truss structures over four fitness objectives with two design constraints. The resulting Pareto front shows a wide variety of bridge designs, demonstrating the power of this approach to generate a diverse set of viable options to meet engineering design challenges.

关键词： Bridges Shape Generative AI Evolution (biology) Evolutionary computation Search problems Organisms Grammar Structural engineering Chemicals

来源：评论

学校读者我要写书评

暂无评论

Covert Communication in RSMA-Assisted Ambient Backscatter Communication Systems

引用

IEEE Transactions on Wireless Communications 2025年

作者： Zhang, Zhuo Yang, Liang Lei, Hongjiang Li, Xingwang Niyato, Dusit Hunan University College of Computer Science and Electronic Engineering Changsha410082 China Hunan University College of Computer Science and Electronic Engineering China Jishou University School of Communication and Electronic Engineering China Chongqing University of Posts and Telecommunications School of Communications and Information Engineering The Chongqing Key Laboratory of Mobile Communications Technology Chongqing400065 China Henan Polytechnic University School of Physics and Electronic Information Engineering Jiaozuo454003 China Nanyang Technological University College of Computing and Data Science Singapore639798 Singapore

In this paper, we investigate covert communication in rate-splitting multiple access (RSMA)-assisted ambient backscatter communication (AmBC) systems. Specifically, in the presence of illegitimate users, a base station applies RSMA to the downlink transmission of covert users and common users in the the primary system of ambient backscatter. To evaluate the covertness of the system, we derive closed-form expressions for the detection error probability (DEP), outage probability (OP), and covert rate (CR), where the DEP is applied to evaluate the ability of the warden to detect the presence or absence of communication behaviors between the base station and the covert user. Based on these expressions, we also conduct an asymptotic analysis of the outage probability, an upper bound analysis of the covert rate, and an analysis of the impact of the power allocation factor on system performance. Numerical results show that the RSMA scheme has a higher covert rate and a higher minimum DEP value compared to the non-orthogonal multiple access (NOMA) scheme, but it may reduce its outage performance. Additionally, an appropriate use of the power allocation factor can enhance the covertness of the system. Furthermore, we find that the co-channel interference between the primary and secondary systems in the ambient backscatter system can degrade the covert performance of the primary system. © 2002-2012 IEEE.

关键词： Backscattering

来源：评论

学校读者我要写书评

暂无评论

Space-harmonic approach to graded temporal metamaterials

引用

Optical Materials Express 2025年第6期15卷 1318-1329页

作者： Mariana Dalarsson Balwan Rana Victor Pacheco-Peña Department of Electrical Engineering School of Electrical Engineering and Computer Science KTH Royal Institute of Technology 100 44 Stockholm Sweden School of Mathematics Statistics and Physics Newcastle University Newcastle upon Tyne NE1 7RU United Kingdom

Metamaterials are mostly studied using the time-harmonic approach, where the wave propagation is spatially described. Recently, studies of media having electromagnetic properties that change in time have been given the attention of the scientific community, aiming to describe wave-matter interaction in both space and time. In the present paper, we use the space-harmonic method for the general description of wave propagation in time. Such a method can be used to effectively describe a "temporal multilayered" (or temporal multi-stepped) metamaterial by alternating the effective material parameters of the medium in time between two values. We obtain the exact analytical solution for the fields in two examples of temporally periodic metamaterials. Numerical simulations for the impedance-matched scenario are also carried out, showing an excellent agreement when compared to the exact analytical field. Our results also demonstrate the duality between the descriptions of the temporally periodic metamaterial and its spatial counterpart, spatially periodic *** by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License . Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

关键词： Effective medium theory Material properties Multilayers Numerical simulation Phase conjugation Wave propagation

来源：评论

学校读者我要写书评

暂无评论

Characteristics of nanoepoxy composite through structural, thermal and machine learning-enhanced dielectric analysis

引用

Journal of Polymer Research 2025年第5期32卷 1-13页

作者： Thakor, Sanketsinh Jain, Prince Joshi, Anand Vaja, Chandan R. Parikh, Swapnil Panchal, Piyush Department of Applied Science and Humanities Parul Institute of Technology Parul University Gujarat Vadodara391760 India Department of Mechatronics Engineering Parul Institute of Technology Parul University Gujarat Vadodara391760 India Department of Physics School of Sciences Gujarat University Gujarat Ahmedabad380009 India Department of Computer Science Engineering Parul Institute of Technology Parul University Gujarat Vadodara391760 India Department of Physics Sardar Vallabhbhai National Institute of Technology Gujarat Surat395007 India Micro Nano Research and Development Center Parul University Gujarat Vadodara391760 India

This study aims to comprehensively explore the characteristics of hybrid nano fillers incorporated epoxy composites (NFIEC) using various analytical techniques. The research encompasses machine learning-enhanced dielectric analysis across a wide frequency spectrum ranging from 100 Hz to 2 MHz. The structural properties of the nano-fillers, pristine epoxy (PE), and NFIEC are investigated through X-ray Diffraction (XRD). Hybrid nano fillers, including combinations like SiO2 + Fe3O4, ZnO + Fe3O4, TiO2 + Fe3O4 and Al2O3 + Fe3O4, are added to the PE at a concentration of 1 wt.% to form NFIEC. Additionally, Differential Scanning Calorimetry are employed to gain further insights into the thermal behaviour of the NFIEC. This study also demonstrates the effectiveness of machine learning models, particularly Extra Trees, CatBoost, XGBoost, and Ensemble Averaging, in predicting dielectric properties (Ε′ and Ε′′) of NFIEC using data from LCR and VNA measurements. The models exhibited high predictive accuracy, with Ensemble Averaging consistently delivering robust performance across datasets, highlighting the potential of ML techniques in advancing material science by reducing experimental efforts and enhancing predictive precision. © The Polymer Society, Taipei 2025.

关键词： Hybrid composites

来源：评论

学校读者我要写书评

暂无评论

Turning rough surfaces into non-line-of-sight cameras

引用

Optica 2025年第5期12卷 626-634页

作者： Li, Wenwen Zhou, Yijun Li, Wei Chen, Yutao Huang, Xin Dai, Chen Zeng, Jianwei Goyal, Vivek K. Xu, Feihu Pan, Jian-Wei Hefei National Research Center for Physical Sciences the Microscale School of Physical Sciences University of Science and Technology of China Hefei230026 China Shanghai Research Center for Quantum Science CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai201315 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China Electrical and Computer Engineering Boston University 8 St. Mary’s Street BostonMA02215 United States

Overcoming the spatial mixing of reflection and scattering from rough surfaces to see a hidden scene is a difficult challenge with a wide range of applications. Existing methods counter the mixing effect using active time-of-flight or coherence-based measurements but at the cost of expensive and dedicated optical systems. Here, we derive a model to accurately describe the microscale scattering properties of a rough surface and show it is well-conditioned for inversion. This enables computational passive non-line-of-sight (NLOS) imaging with unprecedented capabilities. With an ordinary monochrome camera, we demonstrate real-time and high-resolution passive NLOS imaging with spatial resolution of sub-mm, temporal resolution of 25 fps, field of view of near 90◦, and full-color recovery. Furthermore, our approach permits high-quality keyhole NLOS imaging through a mm-scale keyhole and, notably, allows for non-invasive calibration and imaging without any manipulation of the hidden scene. These results open a new avenue for the development ofNLOS imaging, scattering imaging, and relevant applications to real-world conditions. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Image resolution

来源：评论

学校读者我要写书评

暂无评论

Multi-routine-data driven spatio-temporal short-term predictions for surface ozone in China

引用

Air Quality, Atmosphere and Health 2025年 1-10页

作者： Zheng, Canju Shen, Hengqing Sun, Jianan Liu, Guangliang Cao, Haowei Zhang, Jie Gong, Xiang Xu, Da Key Laboratory of Computing Power Network and Information Security Ministry of Education Shandong Computer Science Center Qilu University of Technology (Shandong Academy of Sciences) Jinan China Environment Research Institute Shandong University Shandong Qingdao 266237 China Ningbo Yonghuanyuan Environmental Engineering and Technology Co. LTD Zhejiang Ningbo 315012 China School of Mathematics and Physics Qingdao University of Science and Technology Qingdao 266061 China Shandong Provincial Key Laboratory of Computer Networks Shandong Fundamental Research Center for Computer Science Jinan China Qingdao Innovation Center of Artificial Intelligence Ocean Technology Qingdao 266061 China

Ozone (O3) is a major atmospheric pollutant, and accurate prediction of its concentrations remains challenging due to its complex nonlinear relationships with precursor compounds. Existing machine learning methods hav... 详细信息

Ozone (O₃) is a major atmospheric pollutant, and accurate prediction of its concentrations remains challenging due to its complex nonlinear relationships with precursor compounds. Existing machine learning methods have mainly focused on single-site or spatial predictions, lacking research on spatio-temporal short-term predictions based on simple factors. To address this gap, the MRD-O₃former, a deep learning model driven by multi-routine data, was developed to predict short-term hourly spatio–temporal surface ozone concentrations over China. The model exhibits strong spatio–temporal consistency, achieving a high correlation coefficient (r2=0.85∼0.90) and low normalized mean biases (NMBs) between -15% and 15% at the national scale compared to reanalysis ozone data. Both ablation experiments and permutation importance analysis reveal that historical ozone levels play a primary role in next-day ozone prediction, while meteorological factors such as wind speed and temperature also make significant contributions. Regional validation confirms the model’s effectiveness in the Beijing-Tianjin-Hebei region. Moreover, the study investigates the differential impact of crucial factors in urban and rural areas, revealing that historical ozone levels and meteorological factors significantly influence rural areas. However, the influence of historical ozone levels on urban ozone prediction is relatively small, especially during the summer. This suggests that urban ozone undergoes rapid formation and removal processes. These findings highlight the promising potential of deep learning techniques in accurately predicting spatiotemporal short-term ozone concentrations and interpreting the mechanism and source for ozone pollution. © The Author(s), under exclusive licence to Springer Nature B.V. 2025.

关键词： Data-driven Multi-factor Ozone concentration Spatio-temporal prediction

来源：评论

学校读者我要写书评

暂无评论

Simultaneous Wireless Information and Power Transfer for STAR-RIS Assisted UAV Networks

引用

IEEE Internet of Things Journal 2025年

作者： Xie, Wenwu Qin, Lijuan Wang, Ji Wu, Weimin Li, Xingwang Xu, Hongbo Yang, Liang Hunan Institute of Science and Technology School of Information Science and Engineering Yueyang414006 China Central China Normal University Department of Electronics and Information Engineering Wuhan430079 China Huazhong University of Science and Technology School of Electronic Information and Communications Wuhan430074 China Henan Polytechnic University School of Physics and Electronic Information Engineering Jiaozuo454003 China Hunan University College of Computer Science and Electronic Engineering Changsha410082 China

This paper explores the benefits of deploying simultaneously transmitting and reflecting reconfigurable intelligence surfaces (STAR-RIS) in unmanned aerial vehicle (UAV) networks with simultaneous wireless information and power transfer. In the proposed system, the UAV utilizes STAR-RIS to radiate energy-carrying information signals (ECISs) to multiple outdoor energy receivers and multiple indoor information receivers without flying over indoor no-fly zone. Based on the UAV propulsion power formula, we successively introduce fly-hover-broadcast (FHB) and path discretization (PD) protocols to minimize the total UAV energy consumption by jointly using the extended penalty function and optimization algorithm based on the expected value of channel status information, where the UAV flight constraints, no-fly constraint, minimized energy or information threshold constraints, and STAR-RIS phase-shift constraints are met. The FHB protocol, which requires the UAV to radiate the ECISs to the users at only a few hovering positions, provides a lower-bound performance of UAV energy consumption, while the PD protocol is used to discuss the general situation of the ECISs during UAV flight. Simulation results demonstrate that the utilization of the STAR-RIS in UAV networks outperforms the traditional RIS in improving energy efficiency and extending UAV flight time. © 2014 IEEE.

关键词： Energy utilization

来源：评论

学校读者我要写书评

暂无评论

Breaking demodulation limitations:AWG and Deep Learning in Dynamic Spectral Reconstruction for Differential FBG Accelerometers

引用

IEEE Sensors Journal 2025年第11期25卷 19210-19222页

作者： Yang, Qian Liu, Lei Niu, Ning Quan, ChenYi Ren, SuFen Chen, ShengChao Zhang, JiaLin Yan, YuMeng Xiang, LongTeng Wang, YiPing Liao, ChangRui He, Jun Wang, GuanJun School of Information and Communication Engineering Hainan University College of Electronic Science and Technology China Henan Mechanical and Electrical Vocational College School of Electrical Engineering Henan451100 China Hainan University College of Electronic Science and Technology School of Information and Communication Engineering Haikou570228 China University of Technology Sydney School of Computer Science Faculty of Engineering and Information Technology SydneyNSW Australia Hainan University College of Electronic Science and Technology Haikou570228 China Shenzhen University School of Physics and Optoelectronic Engineering Shenzhen518060 China

Conventional fiber Bragg grating (FBG) accelerometer demodulation often suffers from high environmental sensitivity, complexity, and cost. To address these issues, this paper presents two arrayed waveguide grating (AWG)-based dynamic spectral reconstruction models. First, a novel differential FBG accelerometer with an equal-intensity triangular cantilever beam and a symmetric string-like design enhances sensitivity and mitigates temperature interference. A power ratio-nonlinear logarithmic regression (PR-NLR) model derived from static calibration then enables spectral reconstruction and wavelength demodulation across varying accelerations, achieving 4-82pm accuracy, slightly below that of high-speed demodulators (HSD). Next, by integrating convolutional neural networks (CNN), bidirectional long short-term memory (BiLSTM), attention mechanisms, and a generative adversarial network (GAN) for data augmentation, prediction errors drop to 1-26pm at 20Hz and 0.2-21pm at 40Hz-a reduction of at least 60% over PR-NLR. This outcome underscores the advantages of deep learning (DL) in managing complex spectral shifts. By overcoming frequency-only demodulation limits, the proposed AWG approach achieves precise wavelength demodulation through dynamic spectral reconstruction. Its compact design, low manufacturing cost, and robust performance facilitate scalable deployment in structural health monitoring, particularly for bridge vibration analysis and industrial machinery diagnostics. © 2001-2012 IEEE.

关键词： Arrayed waveguide gratings

来源：评论

学校读者我要写书评

暂无评论

Formalising the intentional stance 2: a coinductive approach

arXiv

引用

arXiv 2025年

作者： McGregor, Simon Timorl Virgo, Nathaniel University of Sussex United Kingdom Centre of Data Innovation Research School of Physics Engineering & Computer Science University of Hertfordshire United Kingdom Earth-Life Science Institute Institute of Science Tokyo Japan

We are concerned with the mathematical foundations of cognition: in particular, given a stochastic process with inputs and output, how might its behaviour be related to the pursuit of a goal? We model this using what we term transducers, which are a mathematical object that captures only the external behaviour of such a system and not its internal state. A companion paper provides an accessible description of our results aimed at cognitive scientists, while the current paper gives formal definitions and proofs of the results. To formalise the concept of a system that behaves as if it were pursuing a goal, we consider what happens when a transducer (a ‘policy’) is coupled to another transducer that comes equipped with a success condition (a ‘teleo-environment’). A (globally) optimal policy is identified with the behaviour of a system that behaves as if it were perfectly rational in the pursuit of a goal;our framework also allows us to model constrained rationality. We find that (globally) optimal policies have a property closely related to Bellman’s principle from dynamic programming: a policy that is optimal in one time step will again be optimal in the next time step, but with respect to a different teleo-environment (obtained from the original one by a modified version of Bayesian filtering). This helps to elucidate the appearance of Bayesian formalisms in models of cognition. We describe a condition that is sufficient for this property to also apply to the bounded-rational case. Additionally, we show that a policy is deterministic if and only if there exists a teleo-environment for which it is uniquely optimal among the set of all policies;this is at least conceptually related to classical representation theorems from decision theory. This need not hold in the bounded-rational case;we give an example of this related to the so-called absent-minded driver problem. All of the formalism is defined using coinduction, following the style proposed by Czajka[6].MSC Codes

关键词： Stochastic systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：