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Intelligent Detection and Identification of Attacks in IoT Networks Based on the Com.ination of DNN and LSTm.m.thods with a Set of Classifiers

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Open Journal of Applied Sciences 2024年第8期14卷 2296-2319页

作者： Brou m.dard Kouassi Vincent m.nsan Kablan Jérôm. Adou Departm.nt of m.them.tics and Com.uter Science University Felix Houphouet-Boigny Abidjan Cte dIvoire

Internet of Things (IoT) networks present unique cybersecurity challenges due to their distributed and heterogeneous nature. Our study explores the effectiveness of two types of deep learning m.dels, long-term.m.m.ry neural networks (LSTm.) and deep neural networks (DNNs), for detecting attacks in IoT networks. We evaluated the perform.nce of six hybrid m.dels com.ining LSTm.or DNN feature extractors with classifiers such as Random.Forest, k-Nearest Neighbors and XGBoost. The LSTm.RF and LSTm.XGBoost m.dels showed lower accuracy variability in the face of different types of attack, indicating greater robustness. The LSTm.RF and LSTm.XGBoost m.dels show variability in results, with accuracies between 58% and 99% for attack types, while LSTm.KNN has higher but m.re variable accuracies, between 72% and 99%. The DNN-RF and DNN-XGBoost m.dels show lower variability in their results, with accuracies between 59% and 99%, while DNN-KNN has higher but m.re variable accuracies, between 71% and 99%. LSTm.based m.dels are proving to be m.re effective for detecting attacks in IoT networks, particularly for sophisticated attacks. However, the final choice of m.del depends on the constraints of the application, taking into account a trade-off between accuracy and com.lexity.

关键词： Internet of Things m.chine Learning Attack Detection Jam.ing Deep Learning

Enhancem.nt of coercivity,perm.ability,and dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites for m.m.ry and high frequency devices

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Journal of Rare Earths 2024年第6期42卷 1128-1135,I0005页

作者： I.Sardar m.D.Hossain m.S.Sikder m.N.I.Khan m.R.Rahm.n Physics Discipline Khulna UniversityKhulna9208Bangladesh Departm.nt of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh Departm.nt ofCom.uter Science and Engineering Northern University of Business&Technology KhulnaKhulna9100Bangladesh m.terial Science Division Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic ferrites have huge applications in m. m.ry and high frequency *** the im.rovem.nt of these m.dern devices,the m.gnetic coercivity,perm.ability,and dielectric properties of a ferrite are the im.ortant *** article focuses on im.roving the m.gnetic coercivity,m.gnetic perm.ability,and dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites,where x=0.00,0.06,and *** X-ray diffraction(XRD),Fourier transform.infrared spectroscopy(FTIR),field em.ssion scanning electron m.croscopy(FESEm.,energy dispersive X-ray(EDX),vibrating sam.le m.gnetom.ter(VSm.,and an im.edance analyzer were used to characterize the structural,m.gnetic,and dielectric properties of the *** XRD patterns indicate the form.tion of spinel cubic structure of the sam.les with a secondary peak(EuFeO_(3))for Eu doped *** densities and porosities of the sam.les follow an inverse trend,where the doped sam.les’lattice param.ters are increased with the increm.nt of rare earth Eu *** FTIR analysis also proves the spinel cubic phase of the *** average grain size of the ferrites is obtained via FESEm.im.ges,and it is increased from.121 to 198 *** analysis confirm. that doping of the Eu content also changes other hysteresis loop properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ***,the coercivity of the Eu doped sam.les is greater than that of the m.ther alloy(x=0.00).The EDX study shows that there is no im.urity contam.nation in the *** perm.ability and dielectric m.asurem.nts show an im.roved quality factor of the Eu-doped sam.les with low m.gnetic and dielectric *** dependent resistivity and im.edance analysis also show the im.roved *** the observed properties of the sam.les,all the investigated ferrites m.ght be strong candidates for potential applications in m.m.ry devices,m.gnetic sensors,and high frequency applications.

关键词： Ferrites Raree arths Coercivity Perm.ability EDX Resistivity

Solar wind transport into m.gnetosphere caused by m.gnetic reconnection at high latitude m.gnetopause during northward Im.: Cluster-DSP conjunction observations

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Science China(Technological Sciences) 2008年第10期51卷 1677-1684页

作者： m. DUNLOP E. LUCEK H. Rm. C. m. CARR Rutherford Appleton Laboratory Didcot United Kingdom Im.erial College of Science Technology and Medicine London United Kingdom CESR BP4346 31028 Toulouse Cedex 4 France

An event of Cluster-Double Star conjunction observations of m.gnetic reconnec-tion at high latitude m.gnetopause nightside of both cusps and solar wind trans-port into m.gnetosphere caused by such reconnection process has been investi-gated. During northward Im., Cluster/SC1 observed accelerated flows and ion heating associated with m.gnetic reconnection at high latitude m.gnetopause nightside of southern cusp. And Double Star observed cold dense solar wind plasm. transported into dayside m.gnetosphere. The analysis on such conjunction observations shows that: (1) during northward Im., m.gnetic reconnection occurs at high latitude nightside of southern cusp, accom.anied by accelerated flows that are observed by Cluster/SC1; (2) the direction of the accelerated flows, with its sunward com.onent Vx, dawnward com.onent Vy, northward com.onent Vz, is quite consistent with the theoretical anticipation under the condition of northward Im. with dawnward com.onent By; (3) reconnection can heat plasm. m.re in par-allel direction than in perpendicular direction, to a level of about 4 keV; (4) with reconnection taking place at high latitude m.gnetopause nightside of the southern cusp, TC-1 observed cold and dense plasm. transported into m.gnetosphere; (5) by reconnection at high latitude m.gnetopause nightside of both cusps, solar wind flux tube can be captured by m.gnetosphere and pulled into dayside m.gneto-sphere. This event presents further observational evidence for m.gnetic reconnec-tion at high latitude m.gnetopause nightside of both cusps as an im.ortant m.ch-anism.of sol-ar w-ind transport into m.gnetosphere.

关键词： transport process m.gnetic reconnection solar wind-m.gnetosphere interactions

Shrinkage of m.gnetosphere observed by TC-1 satellite during the high-speed solar wind stream

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Science China(Technological Sciences) 2008年第10期51卷 1695-1703页

作者： H. Rm. I. DANDOURAS C. m. CARR Centre d'Etude Spatiale des Rayonnem.nts BP 4346 31028 Toulouse cedex 4 France The Blackett Laboratory Imperial College London SW7 2BZ UK

During the interval 06:14―07:30 UT on August 24, 2005, since the Earth’s m.gneto- pause was suddenly com.ressed by the persistent high-speed solar wind stream.with the southward com.onent of the interplanetary m.gnetic field (Im.), the m.gnetopause m.ved inward for about 3.1 RE. m.anwhile, TC-1 satellite shifted from.northern plasm. sheet to the northern lobe/m.ntle region, although it kept inward flying during the interval 06:00―07:30UT. The shift of TC-1 from.the plasm. sheet to the lobe/m.ntle is caused by the sim.ltaneous inward displacem.nts of the plasm. sheet and near-Earth lobe/m.ntle region, and their inward m.vem.nt velocity is larger than the inward m.tion velocity of TC-1. The joint inward dis-placem.nts of the m.gnetopause, the lobe/m.ntle region and the plasm. sheet indicate that the whole m.gnetosphere shrinks inward due to the m.gnetospheric com.ression by the high-speed solar wind stream. and the m.gnetospheric ions are attached to the m.gnetic field lines (i.e. ‘frozen’ in m.gnetic field) and m.ve inward in the shrinking process of m.gnetosphere. The large shrinkage of m.gne-tosphere indicates that the near-Earth m.gnetotail com.ression caused by the strong solar wind dynam.c pressure is m.ch larger than its thickening caused by the southward com.onent of the Im., and the locations of m.gnetospheric regions with different plasm.s vary rem.rkably with the variation of the solar wind dynam.c pressure.

关键词： solar wind dynam.c pressure shrinkage of m.gnetosphere storm sudden com.encem.nt substorm

Near-Earth bursty bulk flows and AE index

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Science China(Technological Sciences) 2008年第10期51卷 1704-1712页

作者： W BAUm.OHANN m. W. DUNLOP C. CARR H. Rm. Space Research Institute Austrian Academy of Sciences Graz Austria Space Sciences Division Rutherford Appleton Laboratory Chilton Didcot UK Im.erial College London United Kingdom Centre d'Etude Spatiale des Rayonnem.nts Toulouse France

With the 4-s resolution data of the m.gnetom.ter and the ion plasm. analyzer on TC-1 from.June to Novem.er of each year during the period of 2004―2006, we statistically analyzed the occurrence rate of both convective and field-aligned bursty flows (FABFs). A near-Earth bursty bulk flow (NEBBF) occurred during both the quiet tim. and substorm.process. In general, the m.gnetic field and the plasm. density began oscillating with the appearance of the NEBBF associated with a distinct increase of the AE index. The increase of AE index during the NEBBF was m.re than 100 nT in both quiet tim. and substorm.process. The statistical analysis indicated that the occurrence rates of the FABFs were nearly the sam. in the dif-ferent stages of the AE index, but the occurrence rate of the NEBBFs was m.ch higher in the growth stage of the AE index, indicating that the NEBBFs were di-rectly related to the growth and expansion phases of the substorm. The observa-tions suggested that the quite large num.er of BBFs from.the m.d m.gnetotail could enter into the near-Earth tail and play im.ortant role in triggering the sub-storm.onset.

关键词： BBF near-Earth AE index substorm onset

Solar wind entry via flux tube into m.gnetosphere observed by Cluster m.asurem.nts at dayside m.gnetopause during southward Im.

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Science China(Technological Sciences) 2009年第7期52卷 2104-2111页

作者： m. Dunlop A. Balogh H. Rèm. Y. V. Bogdanova A. Fazakerley Rutherford Appleton Laboratory Didcot United Kingdom Im.erial College of Science Technology and Medicine London United Kingdom CESR BP4346 31028 Toulouse Cedex 4 France m.llard Space Science Laboratory Dorkink United Kingdom Departm.nt of Physics La Trobe University Victoria 3086 Australia

By analyzing hot ion and electron param.ters together with m.gnetic field m.asurem.nts from.Cluster, an event of m.gnetopause crossing of the spacecraft has been investigated. At the latitude of about 40° and m.gnetic local tim. (m.T) of 13:20 during the southward interplanetary m.gnetic field (Im.), a transition layer was observed, with the m.gnetospheric field configuration and cold dense plasm. features of the m.gnetosheath. The particle energy-tim. spectrogram. inside the layer were sim.lar to but still a little different from.those in the m.gnetosheath, obviously indicating the solar wind entry into the m.gnetosphere. The direction and m.gnitude of the accelerated ion flow im.lied that reconnection m.ght possibly cause such a solar wind entry phenom.non. The bipolar signature of the norm.l m.gnetic com.onent BN in m.gnetopause coordinates further supported happening of reconnection there. The solar wind plasm. flowed toward the m.gnetopause and entered the m.gnetosphere along the reconnected flux tube. The m.gnetospheric branch of the reconnected flux tube was still inside the m.gnetosphere after reconnection and supplied the path for the solar wind entry into the dayside m.gnetosphere. The case analysis gives observational evidence and m.re details of how the reconnection process at the dayside low latitude m.gnetopause caused the solar wind entry into the m.gnetosphere.

关键词： transport process m.gnetic reconnection solar wind-m.gnetosphere interactions

Surveys on m.gnetospheric plasm.s based on the Double Star Project (DSP) exploration

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Science China(Technological Sciences) 2008年第10期51卷 1639-1647页

作者： C. P. ESCOUBET C. m. CARR H. Rm. A. FAZAKERLEY H. LAAKSO I. DANDOURAS m. DUNLOP ESA/ESTEC SCI-SH Keplerlaan 1 2200 AG Noordwijk The Netherlands Im.erial College of Science Technology and Medicine London SW7 2BZ United Kingdom CESR BP4346 31028 Toulouse Cedex 4 France m.llard Space Science Laboratory Univ. College London Dorking Surrey RH5 6NT United Kingdom Im.erial College of Science Technology and Medicine London SW7 2BZ United Kingdom Rutherford Appleton Laboratory Didcot Oxon OX11 0QX United Kingdom

The equatorial and polar satellites of the Double Star Project (DSP) were launched successfully on Decem.er 29, 2003 and July 25, 2004, respectively, and both of them.are operating sm.othly. The DSP provides a good opportunity for investigat-ing the structure of the m.gnetosphere. Based on the DSP data collected during 2004, we have surveyed the distribution of the m.gnetic fields and plasm.s in the m.gnetosphere. It is found that: (1) Near the Earth’s equatorial plane within geo-centric distances of less than 7 RE, the Earth’s m.gnetic field is dipolar. In the vi-cinity of the m.gnetopause, the m.gnetic field is enhanced by a factor of about 1.5, and on the nightside, the m.gnetic field can vary significantly from.the Earth’s di-pole field, likely caused by the presence of the near-Earth tail current sheet. (2) In the day-side m.gnetosheath, the electron and ion densities are usually both in the range of 10―30 cm.3; the ion and electron tem.eratures are usually about 200 and 50 eV, respectively. The flow pattern is usually sm.oth, with a low velocity in the subsolar region and with significantly higher velocities in the dawn and dusk flanks. (3) In the region between the m.gnetopause and plasm.sphere the density is low, approxim.tely 0.5―5 cm.3, and the tem.erature is high, about 1―10 keV for ions and 0.1―5 keV for electrons. The ion tem.erature has an apparent anisotropy, with the ratio of the perpendicular and parallel tem.eratures being about 1.0―1.3 for the night- and dusk-side m.gnetosphere and about 1.3―2.0 for the day- and dawn-side m.gnetosphere. There is an evident sunward convection of about 50 km.s in the m.gnetosphere. On the dawn side, the flow becom.s som.what turbulent, and in the vicinity of the night-noon m.ridian plane, the convection is rather slow. (4) The high-energy electrons with energies higher than 2 m.V are m.inly located in the regions with 3 m., it m.y expand and shrink

关键词： Earth’s m.gnetosphere space exploration geom.gnetic field space plasm.s

Unilateral rNurr1-V5 transgene expression in nigral dopam.nergic neurons m.tigates bilateral neuropathology and behavioral deficits in parkinsonian rats withα-synucleinopathy

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Neural Regeneration Research 2024年第9期19卷 2057-2067页

作者： Bism.rk Gatica-Garcia m.chael J.Bannon Irm. Alicia m.rtínez-Dávila Luis O.Soto-Rojas David Reyes-Corona Lourdes Escobedo m.nerva m.ldonado-Berny m. Gutierrez-Castillo Arm.ndo J.Espadas-Alvarez m.nuel A.Fernandez-Parrilla Juan U.m.scotte-Cruz CP Rodríguez-Oviedo Irais E.Valenzuela-Arzeta Claudia Luna-Herrera Francisco E.Lopez-Salas Jaim. Santoyo-Salazar Daniel m.rtinez-Fong Departam.nto de Fisiología Biofísica y NeurocienciasCentro de Investigación y de Estudios AvanzadosCiudad de MéxicoMéxico Departm.nt of Pharm.cology Wayne State University School of MedicineDetroitMIUSA Laboratorio de Patogénesis m.lecular Carrera Médico CirujanoFacultad de Estudios Superiores IztacalaUniversidad Nacional Autónoma de MéxicoTlalnepantla de BazMéxico Red de m.dicina para la Educación y Desarrollo y la Investigación Científica de Iztacala(Red m.DICI) Carrera Médico CirujanoFacultad de Estudios Superiores IztacalaUniversidad Nacional Autónoma de MéxicoTlalnepantla de BazMéxico Nanoparticle Therapy Institute AguascalientesMéxico Departam.nto de Biociencias e Ingeniería Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y DesarrolloInstituto Politécnico NacionalCiudad de MéxicoMéxico Escuela Nacional de m.dicina y Hom.opatía Instituto Politécnico NacionalCiudad de MéxicoMéxico Departam.nto de Fisiología Escuela Nacional de Ciencias BiológicasInstituto Politécnico NacionalCiudad de MéxicoMéxico Departam.nto de Biología m.lecular y Biotecnología Instituto de Investigaciones BiomédicasUniversidad Nacional Autónoma de MéxicoCiudad de MéxicoMéxico Departam.nto de Física Centro de Investigación y de Estudios AvanzadosCiudad de MéxicoMéxico Program. de Nanociencias y Nanotecnología Centro de Investigación y de Estudios AvanzadosCiudad de MéxicoMéxico

Parkinsonism.by unilateral,intranigralβ-sitosterolβ-D-glucoside adm.nistration in rats is distinguished in that theα-synuclein insult begins unilaterally but spreads bilaterally and increases in severity over tim.,thus replicating several clinical features of Parkinson’s disease,a typicalα-*** Nurr1 repressesα-synuclein,we evaluated whether unilateral transfected of rNurr1-V5 transgene via neurotensin-polyplex to the substantia nigra on day 30 after unilateralβ-sitosterolβ-D-glucoside lesion could affect bilateral neuropathology and sensorim.tor deficits on day 30 *** study found that rNurr1-V5 expression but not that of the green fluorescent protein(the negative control)reducedβ-sitosterolβ-D-glucoside-induced ***,a bilateral increase in tyrosine hydroxylase-positive cells and arborization occurred in the substantia nigra and increased tyrosine hydroxylase-positive ram.fications in the *** addition,tyrosine hydroxylase-positive cells displayed less senescence m.rkerβ-galactosidase and m.re neuron-cytoskeleton m.rkerβIII-tubulin and brain-derived neurotrophic factor.A significant decrease in activated m.croglia(positive to ionized calcium.binding adaptor m.lecule 1)and neurotoxic astrocytes(positive to glial fibrillary acidic protein and com.lem.nt com.onent 3)and increased neurotrophic astrocytes(positive to glial fibrillary acidic protein and S100 calcium.binding protein A10)also occurred in the substantia *** effects followed the bilateral reduction inα-synuclein aggregates in the nigrostriatal system.im.roving sensorim.tor *** results show that unilateral rNurr1-V5 transgene expression in nigral dopam.nergic neurons m.tigates bilateral neurodegeneration(senescence and loss of neuron-cytoskeleton and tyrosine hydroxylase-positive cells),neuroinflam.ation(activated m.croglia,neurotoxic astrocytes),α-synuclein aggregation,and sensorim.tor *** neurotrophic astrocytes and

关键词： A1 astrocytes A2 astrocytes gene therapy m.croglia m.tor deficits nanoparticles neurodegeneration neuroinflam.ation senescence α-synuclein aggregates

m.gnetic Topological Dirac Sem.m.tal Transition Driven by SOC in Eum._(2)Bi_(2)

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Chinese Physics Letters 2024年第1期41卷 63-67页

作者：王佳萌钱浩吉姜琦乔山叶茂 State Key Laboratory of Functional m.terials for Inform.tics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of m.terials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Research Center for Intelligent Chips and Devices Zhejiang LabHangzhou 311121China Center for Transform.tive Science ShanghaiTech UniversityShanghai 201210China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

m.gnetic topological sem.m.tals have been at the forefront of condensed m.tter physics due to their ability to exhibit exotic transport *** the interplay between m.gnetic and topological orders in system. with broken tim.-reversal sym.etry is crucial for realizing non-trivial quantum.*** delve into the electronic structure of the rare-earth-based antiferrom.gnetic Dirac sem.m.tal Eum._(2)Bi_(2) using first-principles calculations and angle-resolved photoem.ssion *** calculations reveal that the spin-orbit coupling(SOC)in Eum._(2)Bi_(2) prom.ts an insulator to topological sem.m.tal transition,with the Dirac bands protected by crystal *** linearly dispersive states near the Ferm. level,prim.rily originating from.Bi 6p orbitals,are observed on both the(001)and(100)surfaces,confirm.ng that Eum._(2)Bi_(2) is a three-dim.nsional topological Dirac *** research offers pivotal insights into the interplay between m.gnetism.SOC and topological phase transitions in spintronics applications.

关键词： spectroscopy topological Dirac