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A Hybrid Adaptive Filter for Head Tracking in Augmented Reality (AR)-based Flight Simulators

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IEEE Transactions on Computers 2025年

作者： Nwobodo, Onyeka J. Kuaban, Godlove Suila Nkemeni, Valery Wereszczynski, Kamil Cyran, Krzysztof A. Silesian University of Technology Department of Computer Graphics Vision and Digital Systems Faculty of Automatic Control Electronics and Computer Science Gliwice Poland Polish Academy of Sciences Institute of Theoretical and Applied Informatics Poland University of Buea Laboratory of Electrical Engineering and Computing Faculty of Engineering and Technology Buea Cameroon

This paper presents a novel approach for head tracking in augmented reality (AR) flight simulators using an adaptive fusion of Kalman and particle filters. This fusion dynamically balances the strengths of both algorithms, leveraging Kalman filters for computational efficiency and particle filters for handling non-linearities based on real-time factors such as sensor noise and head movement patterns. Our method demonstrates superior tracking precision and reduced latency, making it particularly effective for immersive pilot training in AR-based flight simulations. While focused on flight simulation, our approach holds high potential for broader applications in other AR and virtual reality (VR) environments where precise, real-time head tracking is crucial. These results provide actionable design guidance for developers optimizing tracking systems in environments that require fast response times and high accuracy. Future extensions of this research could explore the generalization of our approach across diverse AR applications, including human-computer interaction (HCI), medical simulations, and gaming. © 1968-2012 IEEE.

关键词： Flight simulators

The application of proximal visible and near-infrared spectroscopy to estimate soil organic matter on the Triffa Plain of Morocco

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International Soil and Water Conservation Research 2020年第2期8卷 195-204页

作者： Ayoub Lazaar Abdul Mounem Mouazen Kamal EL Hammouti Michael Fullen Biswajeet Pradhan Muhammad Sohail Memon Karim Andich Abdelilah Monir Laboratory of Applied Geosciences Department of GeologyFaculty of ScienceMohammed First UniversityOujdaMorocco Division of Mechatronics Biostatistics and Sensors(MeBioS)Faculty of Bioscience EngineeringKasteelpark Arenberg 30B-3001 HeverleeBelgium Faculty of Science and Engineering University of WolverhamptonWolverhamptonWV11LYUnited Kingdom Center for Advanced Modelling and Geospatial Information Systems(CAMGIS) Faculty of Engineering and Information TechnologyUniversity of Technology SydneySydney2007NSWAustralia Faculty of Agricultural Engineering Sindh Agriculture UniversityTandojam70060Pakistan Laboratory of Applied Geomatics and Soil Science National Institute of Agronomic Research(INRA)OujdaMorocco Department of Mathematics EDP and Scientific Computing TeamMoulay Ismail UniversityMéknesMorocco

Soil organic matter (SOM) is a fundamental soil constituent. The estimation of this parameter in the laboratory using the classical method is complex time-consuming and requires the use of chemical re-agents. The objectives of this study were to assess the accuracy of two laboratory measurement setups of the VIS-NIR spectroscopy in estimating SOM content and determine the important spectral bands in the SOM estimation model. A total of 115 soil samples were collected from the non-root zone (0-20 cm) of soil in the study area of the Triffa Plain and then analysed for SOM in the laboratory by the Walkley-Black method. The reflectance spectra of soil samples were measured by two protocols, Contact Probe (CP) and Pistol Grip (PG)) of the ASD spectroradiometer (350-2500 nm) in the laboratory. Partial least squares regression (PLSR) was used to develop the prediction models. The results of coefficient of determination (R2) and the root mean square error (RMSE) showed that the pistol grip offers reasonable accuracy with an R2=0.93 and RMSE=0.13 compared to the contact probe protocol with an R2=0.85 and RMSE = 0.19. The near-Infrared range were more accurate than those in the visible range for pre-dicting SOM using the both setups (CP and PG). The significant wavelengths contributing to the pre-diction of SOM for (PG) setup were at:424, 597, 1432, 1484, 1830,1920, 2200, 2357 and 2430 nm, while were at 433, 587, 1380, 1431, 1929, 2200 and 2345 nm for (CP) setup.

关键词： Soil organic matter VIS-NIR spectroscopy Reflectance spectra SOM estimation SOM analysis

FAST ALGEBRAIC MULTIGRID FOR BLOCK-STRUCTURED DENSE AND TOEPLITZ-LIKE-PLUS-CROSS SYSTEMS ARISING FROM NONLOCAL DIFFUSION PROBLEMS

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arXiv 2022年

作者： Chen, Minghua Cao, Rongjun Serra-Capizzano, Stefano School of Mathematics and Statistics Gansu Key Laboratory of Applied Mathematics and Complex Systems Lanzhou University Lanzhou730000 China Department of Science and High Technology University of Insubria Via Valleggio 11 Como22100 Italy Department of Information Technology Division of Scientific Computing Uppsala University - ITC L ägerhyddsv. 2 hus 2 P.O. Box 337 UppsalaSE-751 05 Sweden

Algebraic multigrid (AMG) is one of the most efficient iterative methods for solving large sparse system of equations. However, how to build/check restriction and prolongation operators in practical of AMG methods for nonsymmetric sparse systems is still an interesting open question [Brezina, Manteuffel, McCormick, Runge, and Sanders, SIAM J. Sci. Comput. (2010);Manteuffel and Southworth, SIAM J. Sci. Comput. (2019)]. This paper deals with the block-structured dense and Toeplitz-like-plus-Cross systems, including nonsymmetric indefinite, symmetric positive definite (SPD), arising from nonlocal diffusion problem and peridynamic problem. The simple (traditional) restriction operator and prolongation operator are employed in order to handle such block-structured dense and Toeplitz-like-plus-Cross systems, which is convenient and efficient when employing a fast AMG. We focus our efforts on providing the detailed proof of the convergence of the two-grid method for such SPD situations. The numerical experiments are performed in order to verify the convergence with a computational cost of only O(NlogN) arithmetic operations, by using few fast Fourier transforms, where N is the number of the grid points. To the best of our knowledge, this is the first contribution regarding Toeplitz-like-plus-Cross linear systems solved by means of a fast AMG. Copyright © 2022, The Authors. All rights reserved.

关键词： Fast Fourier transforms

Two classes of narrow-sense BCH codes and their duals

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arXiv 2022年

作者： Wang, Xiaoqiang Wang, Jiaojiao Li, Chengju Wu, Yansheng Hubei Key Laboratory of Applied Mathematics Faculty of Mathematics and Statistics Hubei University Wuhan430062 China Data Science and Information Technology Research Center Tsinghua-Berkeley Shenzhen Institute Tsinghua Shenzhen Inter national Graduate School Shenzhen China The Shanghai Key Laboratory of Trustworthy Computing East China Normal University Shanghai200062 China The National Mobile Communications Research Laboratory Southeast University Nanjing210096 China School of Computer Science Nanjing University of Posts and Telecommunications Nanjing210023 China

BCH codes and their dual codes are two special subclasses of cyclic codes and are the best linear codes in many cases. A lot of progress on the study of BCH cyclic codes has been made, but little is known about the minimum distances of the duals of BCH codes. Recently, a new concept called dually-BCH code was introduced to investigate the duals of BCH codes and the lower bounds on their minimum distances in [12]. For a prime power q and an integer (formula presented), or (formula presented). In this paper, some sufficient and necessary conditions in terms of the designed distance will be given to ensure that the narrow-sense BCH codes of length n are dually-BCH codes, which extended the results in [12]. Lower bounds on the minimum distances of their dual codes are developed for (formula presented). As byproducts, we present the largest coset leader δ1 modulo n being of two types, which proves a conjecture in [28] and partially solves an open problem in [21]. We also investigate the parameters of the narrow-sense BCH codes of length n with design distance δ1. The BCH codes presented in this paper have good parameters in general. © 2022, CC BY.

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Non-Abelian effects in dissipative photonic topological lattices

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arXiv 2022年

作者： Parto, Midya Leefmans, Christian Williams, James Nori, Franco Marandi, Alireza Department of Electrical Engineering California Institute of Technology PasadenaCA91125 United States Department of Applied Physics California Institute of Technology PasadenaCA91125 United States Theoretical Quantum Physics Laboratory RIKEN Saitama Wako-shi351-0198 Japan Department of Physics University of Michigan Ann ArborMI48109-1040 United States RIKEN Center for Quantum Computing Saitama Wako351-0198 Japan

Topology is central to phenomena that arise in a variety of fields, ranging from quantum field theory to quantum information science to condensed matter physics. Recently, the study of topology has been extended to open systems, leading to a plethora of intriguing effects such as topological lasing, exceptional surfaces, as well as the non-Hermitian bulk-boundary correspondence. Here, we show that resonator networks with dissipative couplings can be governed by matrix-valued modified Wilson lines, leading to non-Abelian effects. This is in contrast to conservative Hamiltonians exhibiting non-degenerate energy levels, where the geometric properties of the Bloch eigenstates are typically characterized by scalar Berry phases. We experimentally measure geometric phases and demonstrate non-Abelian effects in a dissipatively-coupled network of time-multiplexed photonic resonators. Our results point to new ways in which the combined effect of topology and engineered dissipation can lead to non-Abelian topological phenomena. Copyright © 2022, The Authors. All rights reserved.

关键词： Topology

Non-thermal Magnetic Deicing Using Two-Dimensional Chromium Telluride

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arXiv 2024年

作者： Gowda, Chinmayee Chowde Kartsev, Alexey Tiwari, Nishant Safronov, A.A. Pandey, Prafull Roy, Ajit K. Ajayan, Pulickel M. Galvão, Douglas S. Tiwary, Chandra Sekhar School of Nano Science and Technology Indian Institute of Technology West Bengal Kharagpur721302 India Computing Center of the Far Eastern Branch The Russian Academy of Sciences Khabarovsk680000 Russia MIREA-Russian Technological University Moscow119454 Russia 6 Miklukho-Maklaya St Moscow117198 Russia Department of Metallurgical and Materials Engineering Indian Institute of Technology West Bengal Kharagpur721302 India Materials Engineering Indian Institute of Technology Gandhinagar Gujurat 382055 India Materials and Manufacturing Directorate Air Force Research Laboratory Wright Patterson AFBOH45433-7718 United States Department of Materials Science and NanoEngineering Rice University 6100 S Main Street HoustonTX77005 United States Applied Physics Department and Computational Engineering and Sciences State University of Campinas SP Campinas13083-970 Brazil

Two-dimensional (2D) chromium telluride Cr2Te3 exhibits strong ferromagnetic ordering with high coercivity at low temperatures and paramagnetic behavior when approaching room temperature. The spin states of monolayer Cr2Te3 shows ferromagnetic ordering in the ground state, and in-situ Raman analysis shows reversible structure transformation and hence ferromagnetic to paramagnetic transition during low-temperature heating cycles (0 - 25 °C). The magnetic phase transition near room temperature in the 2D Cr2Te3 prompted the study of these layered material exploration for energy application. We demonstrate that the low-temperature ferromagnetic behavior can be used to magnetically deice material surfaces using an external magnetic source, avoiding the use of harsh chemicals and high temperatures. The hydrophobic nature and dipole interactions of H2O molecules with the surface of the 2D Cr2Te3 coating aid in the condensation of ice droplets formed on the surface. First-principles calculations also confirm the observed crystal structure, surface interaction, and magnetic properties of 2D Cr2Te3 © 2024, CC BY.

关键词： Density functional theory

Divergence-Free Flux Globalization Based Well-Balanced Path-Conservative Central-Upwind Schemes for Rotating Shallow Water Magnetohydrodynamics

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arXiv 2023年

作者： Chertock, Alina Kurganov, Alexander Redle, Michael Zeitlin, Vladimir Department of Mathematics Center for Research in Scientific Computing North Carolina State University RaleighNC27695 United States Department of Mathematics Shenzhen International Center for Mathematics Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Shenzhen518055 China Applied and Computational Mathematics RWTH Aachen University Aachen52062 Germany Department of Mathematics North Carolina State University RaleighNC27695 United States CNRS Paris75231 France Shenzhen International Center for Mathematics Southern University of Science and Technology Shenzhen518055 China

We develop a new second-order flux globalization based path-conservative central-upwind (PCCU) scheme for rotating shallow water magnetohydrodynamic equations. The new scheme is designed not only to maintain the divergence-free constraint of the magnetic field at the discrete level but also to satisfy the well-balanced (WB) property by exactly preserving some physically relevant steady states of the underlying system. The locally divergence-free constraint of the magnetic field is enforced by following the method recently introduced in [A. Chertock, A. Kurganov, M. Redle, and K. Wu, ArXiv preprint (2022), arXiv:2212.02682]: we consider a Godunov-Powell modified version of the studied system, introduce additional equations by spatially differentiating the magnetic field equations, and modify the reconstruction procedures for magnetic field variables. The WB property is ensured by implementing a flux globalization approach within the PCCU scheme, leading to a method capable of preserving both still- and moving-water equilibria exactly. In addition to provably achieving both the WB and divergence-free properties, the new method is implemented on an unstaggered grid and does not require any (approximate) Riemann problem solvers. The performance of the proposed method is demonstrated in several numerical experiments that confirm the lack of spurious oscillations, robustness, and high resolution of the obtained results. © 2023, CC BY.

关键词： Magnetohydrodynamics

Divergence-Free Flux Globalization Based Well-Balanced Path-Conservative Central-Upwind Schemes for Rotating Shallow Water Magnetohydrodynamics

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SSRN

SSRN 2023年

作者： Chertock, Alina Kurganov, Alexander Redle, Michael Zeitlin, Vladimir Department of Mathematics Center for Research in Scientific Computing North Carolina State University RaleighNC27695 United States Department of Mathematics Shenzhen International Center for Mathematics Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Shenzhen518055 China Applied and Computational Mathematics RWTH Aachen University Aachen52062 Germany Department of Mathematics North Carolina State University RaleighNC27695 United States CNRS Paris 75231 France Shenzhen International Center for Mathematics Southern University of Science and Technology Shenzhen518055 China

关键词： Magnetohydrodynamics

Quantifying Quantum Entanglement in Two-Qubit Mixed State from Connected Correlator

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SSRN

SSRN 2023年

作者： Guo, Xingyu Ma, Chen-Te Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangdong Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangdong Guangzhou510006 China Asia Pacific Center for Theoretical Physics Pohang University of Science and Technology Gyeongsangbuk-do Pohang37673 Korea Republic of School of Physics and Telecommunication Engineering South China Normal University Guangdong Guangzhou510006 China The Laboratory for Quantum Gravity and Strings Department of Mathematics and Applied Mathematics University of Cape Town Private Bag Rondebosch7700 South Africa

We quantify Quantum Entanglement using a connected correlation matrix. Quantifying the degree of entanglement between particles requires entanglement measures. The connected correlation matrix is used to quantify Quantum Entanglement, suggesting that it encompasses all necessary entanglement measures. Our study suggests starting with a three-qubit state and obtaining a mixed state by partial tracing over one qubit. By considering the connected correlation, we aim to eliminate the non-connected sector and capture all relevant entanglement degrees. We classify mixed states and demonstrate that separable states exhibit the lowest correlation within each classified class. We then show that the entanglement measure monotonically increases for the correlation measure. This suggests that the connected correlation effectively quantifies Quantum Entanglement. We compare the results to the logarithmic negativity, another measure of entanglement. Our findings indicate that the negativity increases with the correlation measure, but it is not monotonic. Finally, we propose that interpreting Quantum Entanglement from a local perspective is possible, considering that the observable is a vector with locality but violates freedom of choice. © 2023, The Authors. All rights reserved.

关键词： Quantum entanglement