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DPNet: Dynamic Pooling Network for Accurate and Efficient Size-Aware Tiny Object Detection

IEEE Internet of Things Journal 2025年

作者： Gong, Luqi Chen, Haotian Chen, Yikun Yao, Tianliang Li, Chao Zhao, Shuai Han, Guangjie Beijing University of Posts and Telecommunications School of Computer Science Beijing China Zhejiang Lab Research Center for Space Computing System Hangzhou China Southwest Jiaotong University SWJTU-LEEDS Joint School Chengdu China LTD Guangdong Zhiyun City construction Technology Co Zhuhai China Tongji University College of Electronic and Information Engineering Department of Control Science and Engineering Shanghai China Hohai University Key Laboratory of Maritime Intelligent Network Information Technology Ministry of Education China

In unmanned aerial systems, especially in complex environments, accurately detecting tiny objects is crucial. Resizing images is a common strategy to improve detection accuracy, particularly for small objects. However, simply enlarging images significantly increases computational costs and the number of negative samples, severely degrading detection performance and limiting its applicability. This paper proposes a Dynamic Pooling Network (DPNet) for tiny object detection to mitigate these issues. DPNet employs a flexible down-sampling strategy by introducing a factor (df) to relax the fixed down-sampling process of the feature map to an adjustable one. Furthermore, we design a lightweight predictor to predict df for each input image, which will be used to decrease the resolution of feature map in backbone. Thus, we achieve input-aware down-sampling. We design an Adaptive Normalization Module (ANM) to make a unified detector well compatible with different dfs. At the same time, we also design a guidance loss to supervise the predictor’s training. DPNet realizes the dynamic allocation of computing resources to trade off detection accuracy and efficiency through this. Experiments on the TinyCOCO and TinyPerson datasets show that our DPNet can save over 35% and 25% GFLOPs, respectively, while maintaining comparable detection *** code will be made publicly available. © 2014 IEEE.

关键词： Object detection

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Neighborhood Interval Observer Based Coordination control for Multi-agent systems with Disturbances ⁎

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IFAC-PapersOnLine 2020年第2期53卷 10994-10999页

作者： Xiaoling Wang Guo-Ping Jiang Wen Yang Housheng Su Xiaofan Wang College of Automation Nanjing University of Posts and Telecommunications Nanjing 210023 China and also with Jiangsu Engineering Lab for IOT Intelligent Robots (IOTRobot) Nanjing 210023 China Key Laboratory of Advanced Control and Optimization for Chemical Processes East China University of Science and Technology Shanghai 200237 China School of Artifcial Intelligence and Automation Image Processing and Intelligent Control Key Laboratory of Education Ministry of China Huazhong University of Science and Technology Luoyu Road 1037 Wuhan 430074 China Department of Automation Shanghai University Shanghai 200072 China

This paper focuses on multi-agent systems with uncertain disturbances, in which only the bounding functions on the disturbances and the bounds on the initial state of each agent are known. By designing a neighborhood interval observer for this kind of multi-agent system, the estimation of the sum of the relative state of each agent associated with itself and its neighbors is frstly realized. Then, on the basis of these estimated information, local control algorithm is designed to drive the system to achieve bounded consensus.

关键词： Multi-agent system disturbance neighborhood interval observer bounded consensus

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Correction to: Dielectric properties and nonlinear I–V electrical behavior of (Li1+, Al3+) co-doped CaCu3Ti4O12 ceramics

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Applied Physics A 2019年第9期125卷 1-2页

作者： Sun, Li Ni, Qing Guo, Jianqin Cao, Ensi Hao, Wentao Zhang, Yongjia Ju, Lin Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan People’s Republic of China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan People’s Republic of China College of Physics and Electrical Engineering Anyang Normal University Anyang People’s Republic of China

Dear readers,

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Performance Improvement of Raman Distributed Temperature system by Using Noise Suppression

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Photonic Sensors 2018年第2期8卷 103-113页

作者： Jian LI Yunting LI Mingjiang ZHANG Yi LIU Jianzhong ZHANG Baoqiang YAN Dong WANG Baoquan JIN Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology Taiyuan 030024 China College of Physics and Optoelectronics Institute of Optoelectronic Engineering Taiyuan University of Technology Taiyuan 030024 China

In Raman distributed temperature system, the key factor for performance improvement is noise suppression, which seriously affects the sensing distance and temperature accuracy. Therefore, we propose and experimentally demonstrate dynamic noise difference algorithm and wavelet transform modulus maximum （WTMM） to de-noising Raman anti-Stokes signal. Experimental results show that the sensing distance can increase from 3 kin to 11.5 km and the temperature accuracy increases to 1.58 ℃ at the sensing distance of 10.4kin.

关键词： Optical fiber sensors Raman scattering noise suppression wavelet transform modulus maximum

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High-Speed Physical key Distribution Based on Chaos Synchronization

High-Speed Physical Key Distribution Based on Chaos Synchron...

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Asia Communications and Photonics Conference

作者： Anbang Wang Hua Gao Longsheng Wang Yuncai Wang School of Information Engineering Guangdong University of Technology Guangzhou 510006 China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan 030024 China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China

Physical key distribution is of vital importance to secure communication. We propose and experimentally demonstrate a high-speed physical key distribution scheme using chaos synchronization of multimode semiconductor ... 详细信息

ISBN: (纸本)9781943580705

关键词： Chaos Laser modes Lasers Multimode lasers Quantum key distribution Random number generation

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Inherent characteristics analysis of compound planetary gear set 15

Inherent characteristics analysis of compound planetary gear...

引用

15th International Conference on Ubiquitous Robots, UR 2018

作者： Li, G. Xiong, X. Niu, L. Zhang, X. Zhao, B. Ministry of Education Taiyuan University of Technology Key Laboratory of Advance Transducers and Intelligent Control System Taiyuan030024 China Key Laboratory of High-efficiency and Clean Mechanical Manufacture Shandong University Ministry of Education School of Mechanical Engineering Jinan250061 China

ISBN: (纸本)9781538663349

A nonlinear dynamic model is established to investigate the inherent characteristics of compound planetary gear set. Further, the analytical method is proposed to evaluate the time-varying mesh stiffness (TVMS) of the system based on improved potential energy method. Moreover, an analytical approach is proposed to quantify the TVMS reduction due to crack damage for the internal gear. Finally, the numerical analysis method is used to solve the equation of the free motion, and the inherent characteristics of the system with and without damage are obtained. The phenomenon of loci veering induced by TVMS is analyzed. The effects of the crack propagation on the natural frequencies of the system are also analyzed. © 2018 IEEE.

关键词： Potential energy

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Omnidirectional Conformal Cloak Without Geometrical Dispersion

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Physical Review Applied 2019年第6期12卷 064009-064009页

作者： Yichao Liu Fei Sun Sailing He Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic Research JORCEP East Building #5 Zijingang Campus Zhejiang University Hangzhou 310058 China Department of Electromagnetic Engineering School of Electrical Engineering Royal Institute of Technology (KTH) S-100 44 Stockholm Sweden

The phase delay problem of invisibility cloaks designed by optical conformal mapping is referred to the optical path difference between the waves in upper and lower Riemann sheets. As the frequency changes, the phase delay varies accordingly (here, we call it geometrical dispersion), which restricts the cloaks to working only at some discrete frequencies. Here, we solve the phase-delay problem by placing an optically null medium in the lower Riemann sheet. The conformal cloaks designed by using our method have many advantages, such as a continuous working band (no geometrical dispersion), omnidirectionality, robustness under frequency shifts, and no need for any complex materials that are both anisotropic and inhomogeneous. We also design metallic microchannels to realize our cloaks.

关键词： Optical cloaking Devices Optical materials & elements Optical conformal mapping

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Far-field three-dimensional deep-subwavelength focal spot with azimuthal polarization

arXiv

引用

arXiv 2019年

作者： Nie, Zhongquan Liu, Jiawei Liu, Xiaofei Yan, Weichao Zhang, Yanxiang Tian, Yanting Liu, Shaoding Jia, Baohua Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan030024 Department of Physics Harbin Institute of Technology Harbin150001 China Centre for Micro-Photonics Faculty of Science Engineering and Technology Swinburne University of Technology HawthornVIC3122 Australia

This work focuses on the generation of far-field super-resolved pure-azimuthal focal field based on the fast Fourier transform. A self-designed differential filter is first pioneered to robustly reconfigure a doughnut-shaped azimuthal focal field into a bright one with a sub-wavelength lateral scale (∼0.392λ), which offers a 27.3% reduction ratio relative to that of tightly focused azimuthal polarization modulated by a spiral phase plate. By further uniting the versatile differential filter with spatially shifted beam approach, in addition to allowing for an extremely sharper focal spot, whose size is in turn reduced to 0.228λ and 0.286λ in the transverse as well as axial directions, the parasitic sidelobes are also lowered to an inessential level (3/128). The relevant phase profiles are further exhibited to unravel the annihilation of field singularity and locally linear (i.e. azimuthal) polarization. Our scheme opens a promising route toward efficiently steer and tailor the redistribution of the focal field. Copyright © 2019, The Authors. All rights reserved.

关键词： Fast Fourier transforms

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Combination Effect of Cation Vacancies and O2 Adsorption on Ferromagnetism of Na0.5Bi0.5TiO3（100） Surface:ab initio Study

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Chinese Journal of Chemical Physics 2018年第2期31卷 177-183,245页

作者： Lin Ju Ying Dai Tong-shuai Xu Yong-jia Zhang Li Sun School of Physics and Electric Engineering Anyang Normal University Anyang 455000 China School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan 030024 China

The combination effect of cation vacancies and O2 adsorption on ferromagnetism of Na0.5Bi0.5TiO3（100） surface is studied by using density functional theory. An ideal Na0.5Bi0.5TiO3（100） surface is non-magnetic and the cation vacancy could induce the magnetism. By comparing the formation energies for Na, Bi and Ti vacancy, the Na vacancy is more stable than the others. Therefore, we focus on the configuration and electric structure for the system of O2 molecule adsorption on the Na0.5Bi0.5TiO3（100） surface with a Na vacancy. Among the five physisorption configurations we considered, the most likely adsorption position is Na vacancy. The O2 adsorption enhances the magnetism of the system. The contribution of spin polarization is mainly from the O 2p orbitals. The characteristics of exchange coupling are also calculated, which show that the ferromagnetic coupling is favorable. Compared with the previous calculation results, our calculations could explain the room-temperature ferromagnetism of Na0.5Bi0.5TiO3 nanocrytalline powders more reasonably, because of taking into account adsorbed oxygen and cation vacancies. Moreover, our results also show that adsorption of O2 molecule as well as introduction of cation vacancies may be a promising approach to improve multiferroic materials.

关键词： O2 adsorption Cation vacancies Ferromagnetism First-principles calculation

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Evaluating entropy rate of laser chaos and shot noise

arXiv

引用

arXiv 2019年

作者： Guo, Xiaomin Liu, Tong Wang, Lijing Fang, Xin Zhao, Tong Virte, Martin Guo, Yanqiang Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan030024 China Vrije Universiteit Brussel Pleinlaan 2 Brussels1050 Belgium State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Taiyuan030006 China

Evaluating entropy rate of high-dimensional chaos and shot noise from analog raw signals remains elusive and important in information security. We experimentally present an accurate assessment of entropy rate for physical process randomness. The entropy generation of optical-feedback laser chaos and physical randomness limit from shot noise are quantified and unambiguously discriminated using the growth rate of average permutation entropy value in memory time. The permutation entropy difference of filtered laser chaos with varying embedding delay time is investigated experimentally and theoretically. High resolution maps of the entropy difference is observed over the range of the injection-feedback parameter space. We also clarify an inverse relationship between the entropy rate and time delay signature of laser chaos over a wide range of parameters. Compared to the original chaos, the time delay signature is suppressed up to 95% with the minimum of 0.015 via frequency-band extractor, and the experiment agrees well with the theory. Our system provides a commendable entropy evaluation and source for physical random number generation. Copyright © 2019, The Authors. All rights reserved.

关键词： Entropy

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