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14th International Conference on Indoor Positioning and Indoor Navigation - Work-in Progress Papers, IPIN-WiP 2024

作者： Tian, Di Zhao, Dangjun School of Automation Central South University South Lushan Road 932 Changsha410083 China Hunan Provincial Key Laboratory of Optic-Electronic Intelligent Measurement and Control South Lushan Road 932 Changsha410083 China

Locations of indoor Access Points (APs) play a critical role in indoor Wi-Fi localization. The existing manual site survey for AP location determination is relatively accurate but labor-intensive and time-consuming, especially in large-scale scenarios. Hence, the existing state-of-the-art methods prefer to perform inversion methods based on received signal strength (RSS) at Reference Points (RPs) to estimate the locations of APs. However, due to the absence of common datatsets, comparing these methods on an equal footing is challenging. Therefore, a dataset that covers multiple scenarios from a single room to the whole wide-range floor is first presented in this paper. The dataset is automatically constructed by a low-cost small indoor mobile robot at Central South University, Changsha, China. The dataset contains diversity elements: the occupancy grid map, the real global locations of the pre-deployed APs in each scenario, and the measurements at each reference point. As a result, it is convenient for scholars to propose new methods and execute comparisons. In addition, dataset baselines for AP location determination under different methods are demonstrated. The dataset will be available at https://***/tdcsu/CSUIndoorAPDet. © 2024 Copyright for this paper by its authors.

关键词： Wireless local area networks (WLAN)

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A combined experimental and analytical method to determine the EHL friction force distribution between rollers and outer raceway in a cylindrical roller bearing

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Friction 2023年第8期11卷 1455-1469页

作者： Yu HOU Xi WANG Di YANG Zeliang XIAO School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China

Friction force is a crucial factor causing power loss and fatigue spalling of rolling element bearings.A combined experimental and analytical method is proposed to quantitatively determine the elastohydrodynamic lubrication(EHL)friction force distribution between rollers and outer raceway in a cylindrical roller bearing(CRB).An experimental system with the instrumented bearing and housing was developed for measuring radial load distribution and friction torque of bearings.A simplified model of friction force expressed by dimensionless speed,load,and material parameters was *** inequality constrained optimization problem was established and solved by using an experimental data-driven learning algorithm for determining the uncertain parameters in the *** effect of speed,load,and lubricant property on friction force and friction coefficient was discussed.

关键词： cylindrical roller bearing(CRB) elastohydrodynamic lubrication(EHL) friction force distribution friction torque combined method

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Development prospects of metal-based two-dimensional nanomaterials in lithium-sulfur batteries

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Chinese Chemical Letters 2023年第1期34卷 102-113页

作者： Yuxue Mo Liling Liao Dongyang Li Rongwu Pan Yanhong Deng Yanliang Tan Haiqing Zhou College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421002China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Changsha 410082China Hunan Shengli High-tech Energy Technology Co. Ltd.Yongzhou 425000China Hunan Provincial Key Laboratory of Intelligent Information Processing and Application Hengyang 421002China

A lithium-sulfur(Li-S)system is an important candidate for future lithium-ion system due to its low cost and high specific theoretical capacity(1675 m Ah/g,2600 Wh/kg),which is greatly hindered by the poor conductivity of sulfur,large volume change and dissolution of lithium ***-dimensional(2D)materials with monolayers or few-layers usually have peculiar structures and physical/chemical properties,which can resolve the critical issues in Li-S ***,the metal-based 2D nanomaterials,including ferrum,cobalt or other metal-based composites with various anions,can provide high conductivity,large surface area and abundant reaction sites for restraining the diffusion for lithium *** this mini-review,we will present an overview of recent developments on metal-based 2D nanomaterials with various anions as the electrode materials for Li-S *** the main bottleneck for the Li-S system is the shuttle of polysulfides,emphasis is placed on the structure and components,physical/chemical interaction and interaction mechanisms of the 2D ***,the challenges and prospects of metal-based 2D nanomaterials for Li-S batteries are discussed and proposed.

关键词： Lithium-sulfur battery Two-dimensional materials Cathode materials Anode materials Anode protection

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Antisymmetry-breaking-coupling–enhanced sensing of quantum reservoirs

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Physical Review A 2024年第1期110卷 012613-012613页

作者： Ji-Bing Yuan Zhi-Min Tang Ya-Ju Song Shi-Qing Tang Zhao-Hui Peng Xin-Wen Wang Le-Man Kuang Key Laboratory of Opto-electronic Control and Detection Technology of University of Hunan Province and College of Physics and Electronic Engineering Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials and Department of Physics Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education and Department of Physics Synergetic Innovation Academy for Quantum Science and Technology

We investigate the use of a single generalized dephasing qubit for sensing a quantum reservoir, where the antisymmetry of the coupling between the qubit and its reservoir is broken. Our results indicate that, in addition to the decay factor encoding channel, the antisymmetry breaking coupling introduces another phase factor encoding channel. We propose an optimal measurement strategy for the generalized dephasing qubit, which enables the practical measurement precision to reach the theoretical ultimate precision quantified by the quantum signal-to-noise ratio (QSNR). As an application example, the generalized dephasing qubit is employed to estimate the s-wave scattering length of an atomic Bose-Einstein condensate. It is found that the QSNR contributed by the antisymmetry breaking coupling is at least two orders of magnitude higher than the QSNR contributed by the antisymmetry coupling at the millisecond timescale, and the optimal relative error can achieve a scaling ∝1/(χt) in long-term encoding, where χ represents the relative driving strength and t is the encoding time. Our work opens a way for supersensitive sensing of quantum reservoirs.

关键词： Open quantum systems & decoherence Quantum parameter estimation Bose-Einstein condensates

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optical Absorption Modulation and Image Display Capabilities of All-Dielectric Metasurface Featuring Integrated Graphene

SSRN

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SSRN 2024年

作者： Xie, Mingxin Li, Zonglin Nie, Guozheng Liu, Yunxin Wang, Jifei School of Microelectronics and Physics Hunan University of Technology and Business Changsha410205 China School of Physics and Electronic Science Hunan University of Science and Technology Hunan Xiangtan411201 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics Hunan Normal University Changsha410081 China Hunan Provincial Key Laboratory of Intelligent Sensors and New Sensor Materials Hunan Xiangtan411201 China

Achieving perfect absorption in monolayer two-dimensional (2D) materials is critical for the next generation of on-chip devices. However, the complete absorption mechanisms based on surface plasmon polaritons (SPPs) and Fabry-Perot cavity (FPC) suffer from limitations in tuning capability, low stability, and complex fabrication processes. Bound states in the continuum (BICs) are considered an ideal platform for enhancing light-matter interactions. In this regard, we propose an all-dielectric metasurface that supports symmetry-protected bound states in the continuum (SP-BIC) in the near-infrared spectral region. By breaking the symmetry of the metasurface, it is transformed into the quasi-bound state in the continuum (qBIC) with exceptional quality factors (Q-factors), while monolayer graphene is introduced into the system to form a critically coupled absorption system. Remarkably, we achieve a modulation efficiency of 93.8% in light absorption by solely controlling the polarization angle of the incident wave without altering the structural parameters. Based on this graphene-metasurface absorber, we successfully demonstrate optical digital "0-1" switching and metasurface image display functionalities. Our research holds the potential to provide theoretical guidance for the next-gen integrated optical elements on chips. © 2024, The Authors. All rights reserved.

关键词： Graphene

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optical Absorption Modulation and Image Display Capabilities of All-Dielectric Metasurface Featuring Integrated Graphene

SSRN

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SSRN 2023年

作者： Xie, Mingxin Li, Zonglin Nie, Guozheng Chen, Ziqi Chen, Zhiquan Wang, Jifei School of Microelectronics and Physics Hunan University of Technology and Business Changsha410205 China School of Physics and Electronic Science Hunan University of Science and Technology Hunan Xiangtan411201 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics Hunan Normal University Changsha410081 China Hunan Provincial Key Laboratory of Intelligent Sensors and New Sensor Materials Hunan Xiangtan411201 China

Achieving perfect absorption in single-layer two-dimensional (2D) materials is critical for the next generation of on-chip integrated photonic components. However, the complete absorption mechanisms based on surface plasmon resonance and Fabry-Pérot cavity suffer from limitations in tuning capability, low stability, and complex fabrication processes. Bound states in the continuum (BIC) are considered an ideal platform for enhancing light-matter interactions. In this regard, we propose an all-silicon metasurface that supports symmetrically protected BIC in the near-infrared region. By breaking the symmetry of the metasurface, it is transformed into a qBIC mode with exceptional Q-factor, while introducing a monolayer graphene into the system to form a critically coupled absorption system. Remarkably, we achieve a modulation efficiency of 93.8% in light absorption by solely controlling the polarization angle of the incident wave, without altering the structural parameters. Based on this graphene-metasurface absorber, we successfully demonstrate optical digital "0-1" switching and metasurface image display functionalities. Our research holds the potential to provide theoretical guidance for the development of next-generation integrated optical elements on chips. © 2023, The Authors. All rights reserved.

关键词： Graphene

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Antisymmetry breaking coupling-enhanced sensing of quantum reservoirs

arXiv

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arXiv 2023年

作者： Yuan, Ji-Bing Tang, Zhi-Min Song, Ya-Ju Tang, Shi-Qing Peng, Zhao-Hui Wang, Xin-Wen Kuang, Le-Man Key Laboratory of Opto-electronic Control and Detection Technology of University of Hunan Province College of Physics and Electronic Engineering Hengyang Normal University Hengyang421002 China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials Department of Physics Hunan University of Science and Technology Xiangtan411201 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics Hunan Normal University Changsha410081 China Synergetic Innovation Academy for Quantum Science and Technology Zhengzhou University of Light Industry Zhengzhou450002 China

We investigate the use of a single generalized dephasing qubit for sensing a quantum reservoir, where the antisymmetry of the coupling between the qubit and its reservoir is broken. Our results indicate that in addition to the decay factor encoding channel, the antisymmetry breaking coupling introduces another phase factor encoding channel. We propose an optimal measurement strategy for the generalized dephasing qubit which enables the practical measurement precision to reach the theoretical ultimate precision quantified by the quantum signal-to-noise ratio (QSNR). As an application example, the generalized dephasing qubit is employed to estimate the s-wave scattering length of an atomic Bose-Einstein condensate. It is found that the QSNR contributed by the antisymmetry breaking coupling is at least two orders of magnitude higher than the QSNR contributed by the antisymmetry coupling at the millisecond timescale, and the optimal relative error can achieve a scaling ∝ 1/(χt) in long-term encoding, where χ represents the relative driving strength and t is the encoding time. Our work opens a way for supersensitive sensing of quantum reservoirs. Copyright © 2023, The Authors. All rights reserved.

关键词： Qubits

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Generating Bell states and Werner states of two qubits via optical field

arXiv

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arXiv 2024年

作者： Jiang, Dengkui Zhai, Cuilu Song, Yaju Peng, Zhaohui Yuan, Jibing Tang, Shiqing Lu, Wangjun Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Department of Maths and Physics Hunan Institute of Engineering Xiangtan411104 China College of Physics and Electronic Engineering Hengyang Normal University Hengyang421002 China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials Department of Physics Hunan University of Science and Technology Xiangtan411201 China

In this paper, we investigate how the evolution of the states of two qubits initially in a direct product state can be controlled by the optical field in a Tavis-Cummings (TC) model. For the two qubits initially in the direct product state, we find that their matrix elements at any moment can be modulated by the coefficients of the optical field initial states in the number state space. We propose a method for preparing an X-type state of two qubits. Subsequently, for descriptive convenience, we divide the Bell states of the two qubits into two kinds in the paper. When both qubits are initially in the ground state, we find that the two qubits can be controlled to produce the first type of Bell state by the superposition state optical field that is initially in the next-nearest-neighbor number state and that the production of any of the first type of Bell states can be controlled by controlling the phase between the two next-nearest-neighbor number states. When one of the two qubits is in the ground state, and the other is in the excited state, we can control the two qubits to produce the second type of Bell state by the single-photon number state optical field. Finally, we study the generation of Werner states by controlling two qubits initially, both in the ground state, using an optical field. © 2024, CC BY.

关键词： Ground state

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Single-lossy-nanoparticle sensor with a dissipatively coupled photonic molecule

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Physical Review A 2023年第3期108卷 033716-033716页

作者： Zhao-Hui Peng Chun-Xia Jia Yu-Qing Zhang Ying Yang Le-Man Kuang Institute of Modern Physics and Department of Physics College of Physics and Electronic Science Hunan University of Science and Technology Xiangtan 411201 China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials Xiangtan 411201 China Key Laboratory of Low-Dimension Quantum Structures and Quantum Control of Ministry of Education Synergetic Innovation Center for Quantum Effects and Applications and Department of Physics Hunan Normal University Changsha 410081 China Synergetic Innovation Academy for Quantum Science and Technology Zhengzhou University of Light Industry Zhengzhou 450002 China

An ultrasensitive optical whispering-gallery mode (WGM) sensor is highly desirable for detecting nanoparticles and has been widely used in human disease diagnosis and environment monitoring. The sensing mechanisms of a WGM sensor include mode shift, mode splitting, and mode broadening. To enhance mode broadening is a quite useful way to improve the sensitivity for detecting lossy nanoparticles, but it has not been realized. Here, we propose a feasible scheme for realizing a single-lossy-nanoparticle sensor with a dissipatively coupled photonic molecule and show that the significant enhancement of mode broadening can be obtainable at exceptional points when compared with a single-microcavity sensor subject to the same perturbation. The enhancement of mode broadening originates from the complex-square-root topology near exceptional points and the unique feature of level attraction in dissipative coupling, i.e., the repelled damping parameters of supermodes. Furthermore, we show that the enhancement factor in mode broadening is larger than that in mode splitting when the dissipatively coupled photonic molecule works in the strong-coupling regime. Therefore, our scheme may be useful to resolve smaller changes in mode broadening and improve the detection limit of lossy-nanoparticle sensing.

关键词： Atoms, ions, & molecules in cavities Light-matter interaction optical microcavities Quantum optics Electric moment Adiabatic approximation Dipole approximation Perturbative methods Rotating wave approximation Schroedinger equation

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A Survey of Machine Learning-based IoT Intrusion Detection Techniques 6

A Survey of Machine Learning-based IoT Intrusion Detection T...

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6th IEEE International Conference on Smart Cloud, SmartCloud 2021

作者： Long, Jing Fang, Fei Luo, Haibo College of Information Science and Engineering Hunan Normal University Changsha410081 China Guangxi Key Laboratory of Cryptography and Information Security Guilin University of Electronic Technology Guilin541004 China Minjiang University Fujian Provincial Key Laboratory of Information Processing and Intelligent Control Fuzhou350121 China

ISBN: (纸本)9781665443746

Research on data anomaly intrusion detection in the Internet of Things (IoT) environment is still insufficient, and there are still many practical problems that need to be solved urgently. At present, the deep integration of Artificial Intelligence (AI) technology and IoT, and intelligent technologies such as machine learning have gradually been applied to the field of intrusion detection of the Internet of Things. Therefore, this paper conducts the latest and in-depth research on the efficient and accurate intrusion detection technology used in computers, analyzes the security threats facing the Internet of Things, and summarizes the latest technology and evaluation indicators of intrusion detection. This paper can promote the improvement of large-scale industrial network security detection performance under the new situation to a certain extent and has important theoretical significance and practical application value for ensuring the rapid and healthy development of today's industrial IoT security environment. © 2021 IEEE.

关键词： Intrusion detection

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