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Actual TDoA-based augmentation system for enhancing cybersecurity in ADS-b

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Chinese Journal of Aeronautics 2021年第2期34卷 217-228页

作者： Ahmed AbdelWahab ELMARADY kamel RAHOUMA Faculty of Engineering Minia UniversityMinia 61519Egypt

Currently, cybersecurity and cyber resilience are emerging and urgent issues in nextgeneration air traffic surveillance systems, which depend primarily on Automatic Dependent Surveillance-broadcast(ADS-b) owing to its low cost and high accuracy. Unfortunately, ADS-b is prone to cyber-attacks. To verify the ADS-b positioning data of aircraft, multilateration(MLAT)techniques that use Time Differences of Arrivals(TDoAs) have been proposed. MLAT exhibits low accuracy in determining aircraft positions. Recently, a novel technique using a theoretically calculated TDoA fingerprint map has been proposed. This technique is less dependent on the geometry of sensor deployment and achieves better accuracy than MLAT. However, the accuracy of the existing technique is not sufficiently precise for determining aircraft positions and requires a long computation time. In contrast, this paper presents a reliable surveillance framework using an Actual TDoA-based Augmentation System(ATbAS). It uses historically recorded real-data from the OpenSky network to train our TDoA fingerprint grid network. Our results show that the accuracy of the proposed ATbAS framework in determining the aircraft positions is significantly better than those of the MLAT and expected TDoA techniques by 56.93% and 48.86%, respectively. Additionally, the proposed framework reduced the computation time by 77% compared with the expected TDoA technique.

关键词： ADS-b Cybersecurity Cyber resilience k-Nearest Neighbors(k-NN)classifier Machine learning Multilateration

Neuroinflammation revisited through the microglial lens

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Neural Regeneration Research 2025年第7期20卷 1989-1990页

作者： Renato Socodato João b.Relvas Institute of Research and Innovation in Health(i3S)and Institute for Molecular and Cell biology(IbMC) University of PortoPortoPortugal Department of biomedicine Faculty of Medicine of the University of Porto(FMUP)PortoPortugal

Neuroimmunology is emerging as a pivotal field,shedding light on the intricate dialogues between the central nervous system(CNS)and the immune *** exploration is particularly significant in understanding microglia,the CNS’s innate immune cells,beyond the conventional conflation of“neuroinflammation”and“microglial activation.”This conflation has clouded the true complexity of these processes,potentially stalling scientific progress and the development of new *** challenge the long-standing perspectives that have oversimplified these interactions,advocating for a deeper exploration of the dynamic relationship between neuroinflammation and microglial *** dissecting specific molecular pathways,we aim to illuminate their elaborate roles in neuroinflammatory responses,especially in the context of Alzheimer’s disease(AD).Here,neuroinflammation is not merely a passive observer or a direct antagonist but a complex agent in the disease’s *** article calls for a significant paradigm shift towards an integrative,multi-omics approach to *** such a comprehensive framework is crucial for advancing our understanding of neuroinflammatory conditions and paving the way for targeted therapeutic strategies for brain diseases.

关键词： inflammation simplified activation

TWO DIMENSIONAL MELLIN TRANSFORM IN QUANTUM CALCULUS

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Acta Mathematica Scientia 2018年第2期38卷 546-560页

作者： kamel bRAHIM Latifa RIAHI Faculty of Sciences of Tunis. University of Tunis El Manar Tunisia

In this article, we introduce the two dimensional Mellin transform M4（f）（s,t）, give some properties, establish the Paley-Wiener theorem and Plancherel formula, present the Hausdorff-Young inequality, and find seve... 详细信息

关键词： Quantum calculus Two dimensional Mellin transform q-Double integral

GENERALIZED DISCRETE Q-HERMITE I POLYNOMIALS AND Q-DEFORMED OSCILLATOR

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Acta Mathematica Scientia 2018年第4期38卷 1411-1426页

作者： kamel MEZLINI Neji bETTAIbI High Institute of Applied Sciences and Technologies of Mateur University of Carthage Tunisia Department of Mathematics College of Science Qassim University KSA

In this paper, we present an explicit realization of q-deformed Calogero-Vasiliev algebra whose generators are first-order q-difference operators related to the generalized dis- crete q-Hermite I polynomials recently ... 详细信息

关键词： basic orthogonal polynomials quantum algebra coherent states

Pressure-broadened atomic Li(2s-2p) line perturbed by ground neon atoms in the spectral wings and core

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Chinese Physics b 2017年第7期26卷 67-74页

作者： Sabri bouchoucha kamel Alioua Moncef bouledroua Physics Department Badji Mokhtar University Laboratoire de Physique de la Matière et du Rayonnement Chérif Messaidia University Laboratoire de Physique des Rayonnements Badji Mokhtar University

Full quantum calculations are performed to investigate the broadening profiles of the atomic lithium Li（2s-2p） resonance line induced by interactions with ground Ne（2s^22p^6） perturbers in the spectral wings and core. The X^2Σ~＋, A^2Π,and b^2Σ~＋ potential-energy curves of the two first low lying Li Ne molecular states, as well as the corresponding transition dipole moments, are determined with ab initio methods based on the SA-CASSCF-MRCI calculations. The emission and absorption coefficients in the wavelength range 550-800 nm and the line-core width and shift are investigated theoretically for temperatures ranging from 130 K to 3000 K. Their temperature dependence is analyzed, and the obtained results are compared with the previous experimental measurements and theoretical works.

关键词： pressure broadening emission and absorption coefficients linewidth lineshift

ON THE FINITE MELLIN TRANSFORM IN QUANTUM CALCULUS AND APPLICATION

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Acta Mathematica Scientia 2018年第4期38卷 1393-1410页

作者： bochra NEFZI kamel bRAHIM Ahmed FITOUHI Faculty of Sciences of Tunis University of Tunis El Manar

The aim of the present paper is to introduce and study a new type of q-Mellin transform [11], that will be called q-finite Mellin transform. In particular, we prove for this new transform an inversion formula and q-convolution product. The application of this transform is also earlier proposed in solving procedure for a new equation with a new fractional differential operator of a variational type.

关键词： q-Mellin transform finite Mellin transform fractional q-integral fractionalq-differential equation

SOME COMPLETELY MONOTONIC FUNCTIONS ASSOCIATED WITH THE q-GAMMA AND THE q-POLYGAMMA FUNCTIONS

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Acta Mathematica Scientia 2015年第5期35卷 1214-1224页

作者： Ahmed SALEM Eid S.kamel Department of basic Science Faculty of Information Systems & Computer ScienceOctober 6 University Department of Mathematics Faculty Science Al Jouf University

In this paper, the q-analogue of the Stirling formula for the q-gamma function （Moak formula） is exploited to prove the complete monotonicity properties of some functions involving the q-gamma and the q-polygamma functions for all real number q 〉 0. The monotonicity of these functions is used to establish sharp inequalities for the q-gamma and the q-polygamma functions and the q-Harmonic number. Our results are shown to be a generalization of results which were obtained by Selvi and batir [23].

关键词： completely monotonic functions inequalities q-gamma function q-polygammafunction

Theoretical investigation of the pressure broadening D1 and D2 lines of cesium atoms colliding with ground-state helium atoms

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Chinese Physics b 2019年第10期28卷 300-308页

作者： Moussaoui Abdelaziz Alioua kamel Allouche Abdul-rahman bouledroua Moncef Universite Cherif Messaidia B.P.1553Souk-Ahras 41000Algerie Laboratoire de Physique de la Matiere et du Rayonnement LPMR Universite Cherif MessaidiaB.P.1553Souk-Ahras 41000Algerie Universite Lyon 1 CNRSLASIM UMR5579bat.A.Kastler43 Bd du 11 novembre 1918F-69622 VilleurbanneFrance Laboratoire de Physique des Rayonnements LPR Universite Badji MokhtarB.P.12Annaba 23000Algerie

Full quantum mechanical calculations are performed to determine the broadening in the far wings of the cesium D1 and D2 line shapes arising from elastic collisions of Cs atom with inert helium atoms. The potential energy curves of the low-lying CsHe molecular states, as well as the related transition dipole moments, are carefully computed from ab initio methods based on state-averaged complete active space self-consistent field-multireference configuration interaction(SACASSCF-MRCI) calculations, involving the spin-orbit effect, and taking into account the Davidson and bSSE *** absorption and emission reduced coefficients are determined in the temperature and wavelength ranges of 323-3000 K and 800-1000 nm, respectively. both profiles of the absorption and the emission are dominated by the free-free transitions,and exhibit a satellite peak in the blue wing near the wavelength 825 nm, attributed to b^2Σ1/2^+→ X^2Σ1/2^+/transitions. The results are in good agreement with previous experimental and theoretical works.

关键词： absorption coefficient emission coefficient pressure broadening potential curves

ON RUbIN'S HARMONIC ANALYSIS AND ITS RELATED POSITIVE DEFINITE FUNCTIONS

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Acta Mathematica Scientia 2012年第5期32卷 1851-1874页

作者： Nji bettaibi kamel Mezlini Moufida El Gunichi College of Science Qassim UniversityBuridaKingdom of Saudi Arabia Institute Suprieur des Sciences Appliques et de la Technologie de Mateur Route de TabarkaMateur7030Tunisia Facult des Sciences de Tunis Campus Universitaire TunisEl Manar2092 TunisTunisia

In this paper,a new formulation of the Rubin’s q-translation is given,which leads to a reliable q-harmonic ***,related q-positive definite functions are introduced and studied,and a bochner’s theorem is proved.

关键词： q-harmonic analysis definite positive function bochner theorem