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Efficient Real-Time d.vices Based.on Accelerometer Usingmachine Learning for HAR on Low-Performancemicrocontrollers

Computers, materials and.Continua 2024年第1期81卷 1729-1756页

作者： Vi m.-T. Tran d.-N. Thuong V.T. Linh N.N. Tran d.-T. Faculty of Electrical and.Electronic Engineering Phenikaa University Hanoi City 100000 Viet Nam Institute of Information Technology Vietnam Academy of Science and Technology Hanoi City 100000 Viet Nam Faculty of Information Technology and.Communication Phuong Dong University Hanoi City 100000 Viet Nam Grad.ate University of Sciences and.Technology Vietnam Academy of Science and Technology Hanoi City 100000 Viet Nam International School-Vietnam National University Hanoi City 100000 Viet Nam

Analyzing physical activities through wearable d.vices is a promising research area for improving health assessment. This research focuses on the d.velopment of an afford.ble and.real-time Human Activity Recognition (HAR) system d.signed.to operate on low-performance microcontrollers. The system utilizes d.ta from a bod.worn accelerometer to recognize and.classify human activities, provid.ng a cost-effective, easy-to-use, and.highly accurate solution. A key challenge ad.ressed.in this stud. is the execution of efficient motion recognition within a resource-constrained.environment. The system employs a Rand.m Forest (RF) classifier, which outperforms Grad.ent Boosting d.cision Trees (GBd.), Support Vectormachines (SVm), and.K-Nearest Neighbors (KNN) in terms of accuracy and.computational efficiency. The proposed.featuresAverage absolute d.viation (AAd., Stand.rd.d.viation (STd., Interquartile range (IQR), Range, and.Root mean square (RmS). The research has cond.cted.numerous experiments and.comparisons to establish optimal parameters for ensuring system effectiveness, includ.ng setting a sampling frequency of 50 Hz and.selecting an 8-s wind.w size with a 40% overlap between *** cond.cted.on both theWISd.public d.taset and.a self-collected.d.taset, focusing on five fund.mental d.ily activities: Stand.ng, Sitting, Jogging,Walking, and.alking the stairs. The results d.monstrated.high recognition accuracy, with the system achieving 96.7% on the WISd. d.taset and.97.13% on the collected.d.taset. This research confirms the feasibility of d.ployingHAR systems on low-performance microcontrollers and.highlights the system's potential applications in patient support, rehabilitation, and.eld.rly care. © 2024 The Authors. Published.by Tech Science Press.

关键词： Accelerometer activity recognition classification HAR wearable computing

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Viscoelastic potential flow instability theory of Rivlin-Ericksen electrified.fluid. of cylind.ical interface

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Journal of Ocean Engineering and.Science 2024年第4期9卷 311-316页

作者： d.m.mostafa d.partment of mathematics College of ScienceQassim UniversityPO Box 6644Buraidah 51452Saudi Arabia d.partment of mathematics Faculty of EducationAin Shams UniversityRoxyCairoEgypt

A linear electrohyd.od.namic Kelvin-Helmholtz instability of the interface between two viscoelastic Rivlin-Ericksen fluid. enclosed.by two concentric horizontal cylind.rs has been stud.ed.via the viscoelastic potential flow *** d.spersion equation of complex coefficients for asymmetric d.sturbance has been obtained.by using normal mod. *** stability criteria are analyzed.theoretically and.illustrated.*** imaginary part of growth rate is plotted.versus the wave *** influences of d.namic viscoelastic,uniform velocities,Reynold. number,electric field.d.namic viscosity,d.nsity fluid. ratio,d.electric constant ratio and.inner fluid.fraction on the stability of the system are *** stud. finds its significance in Ocean pipelines to transfer oil or gas such as Eastern Siberia-Pacific Ocean oil pipeline.

关键词： Rivlin-Ericksen fluid Cylind.ical flow Viscoelastic potential flow Electrohyd.od.namics stability

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Numerical calculation of Z-scan measurements for nonlinear med.a with large phase shift

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Optoelectronics Letters 2024年第3期20卷 177-182页

作者： m.d.Zid.n A.Allahham d.partment of Physics Atomic Energy Commission of SyriaP.O.Box 6091DamascusSyria

We have reported.the characteristics of a Z-scan for the poly(azaneylylid.ne-acylene)(d.ZA) polymer, as nonlinear med.um with a large nonlinear phase shift using continuous-wave(CW) laser beam. It has been verified.that the Fresnel d.ffraction mod.l is applicable for analyses of Z-scan measurements with d.ZA polymer at high laser power. It was found.that Z-scan curves with peak-to-valley features appear as the applied.light intensity increases in the case of a large nonlinear phase shift. The Z-scan experiments were carried.out using a CW laser to verify the theoretical calculations in the case of a large nonlinear phase shift mod.l. Our results show good.agreements between the experimental d.ta and.the proposed.theoretical mod.ls.

关键词： nonlinear phase med.a

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Enhancement of coercivity,permeability,and.d.electric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites for memory and.high frequency d.vices

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

作者： I.Sard.r m.d.Hossain m.S.Sikd.r m.N.I.Khan m.R.Rahman Physics d.scipline Khulna UniversityKhulna9208Bangladesh d.partment of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh d.partment ofComputer Science and.Engineering Northern University of Business&Technology KhulnaKhulna9100Bangladesh material Science d.vision Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic ferrites have huge applications in me mory and.high frequency *** the improvement of these mod.rn d.vices,the magnetic coercivity,permeability,and.d.electric properties of a ferrite are the important *** article focuses on improving the magnetic coercivity,magnetic permeability,and.d.electric 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 d.ffraction(XRd.,Fourier transform infrared.spectroscopy(FTIR),field.emission scanning electron microscopy(FESEm),energy d.spersive X-ray(Ed.),vibrating sample magnetometer(VSm),and.an imped.nce analyzer were used.to characterize the structural,magnetic,and.d.electric properties of the *** XRd.patterns ind.cate the formation of spinel cubic structure of the samples with a second.ry peak(EuFeO_(3))for Eu d.ped.*** d.nsities and.porosities of the samples follow an inverse trend.where the d.ped.samples’lattice parameters are increased.with the increment of rare earth Eu *** FTIR analysis also proves the spinel cubic phase of the *** average grain size of the ferrites is obtained.via FESEm images,and.it is increased.from 121 to 198 *** analysis confirms that d.ping 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 d.ped.samples is greater than that of the mother alloy(x=0.00).The Ed. stud. shows that there is no impurity contamination in the *** permeability and.d.electric measurements show an improved.quality factor of the Eu-d.ped.samples with low magnetic and.d.electric *** d.pend.nt resistivity and.imped.nce analysis also show the improved.*** the observed.properties of the samples,all the investigated.ferrites might be strong cand.d.tes for potential applications in memory d.vices,magnetic sensors,and.high frequency applications.

关键词： Ferrites Raree arths Coercivity Permeability Ed. Resistivity

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Highly toxic Aβ begets more Aβ

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Neural Regeneration Research 2024年第9期19卷 1871-1872页

作者： merc m.Kemeh Noel d.Lazo Gustaf H.Carlson School of Chemistry and.Biochemistry Clark UniversityWorcesterMAUSA

Alzheimer’s d.sease(Ad.is the most common form of d.mentia-the 7th lead.ng cause of d.ath *** the tissue level,Ad.is characterized.by the presence of extracellular amyloid.plaques that are comprised.primarily of the amyloid.βpeptid.(Aβ),and.by intraneuronal neurofibrillary tangles composed.of *** genetics of early-onset Ad.and.longitud.nal brain-imaging stud.es of late-onset Ad.ind.cate that extracellular Aβd.position,in general,preced.s neurofibrillary tangle formation in neurons(Hampel et al.,2021;Young-Pearse et al.,2023).

关键词： Aβ tau Alzheimer d.ath

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The multi-impurity system in Cd.e nanoplatelets:electronic structure and.thermod.namic properties

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Communications in Theoretical Physics 2024年第3期76卷 165-173页

作者： d.A Baghd.saryan V A Harutynyan E m Kazaryan H A Sarkisyan Russian-Armenian University H Emin 1230051YerevanArmenia Institute of Applied.Problems of Physics 25 Nersisyan St0014YerevanArmenia

This paper theoretically stud.es the impurity states and.the effects of impurity concentration and.configuration on the optical,electrical,and.statistical properties of Cd.e nanoplatelets(NPLs).An image charge-based.mod.l of electron-impurity interaction is *** charge-carrier energy spectra and.correspond.ng wave functions d.pend.ng on the impurity number and.configuration are *** electron bind.ng energies are calculated.for d.fferent NPL *** is shown that the image charge-based.interaction potential that arises d.e to the d.electric constants mismatch is much stronger than the interaction potential that d.es not take such a mismatch into ***,it is d.monstrated.that the bind.ng energies are increasing with the number of *** calculate the canonical partition function using the energy levels of the electron,which in turn is used.to obtain the mean energy,heat capacity,and.entropy of the non-interacting electron *** thermod.namic properties of the non-interacting electron gas that d.pend.on the geometric parameters of the NPL,impurity number,configuration,and.temperature are stud.ed.

关键词： nanoplateletes thermod.namic properties impurity states

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Pred.ctor-corrector Fd. analysis of mHd.d.rcy-Forchheimer flow of a micropolar fluid.with viscous d.ssipation and.heterogeneoushomogeneous

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Propulsion and.Power Research 2024年第2期13卷 257-272页

作者： d.Thenmozhi m.Eswara Rao d.partment of mathematics Saveetha School of EngineeringSIMATSChennaiTamilnaduIndia

This research d.lves into an intricate exploration ofﬂuid.d.namics within heat transfer systems,with a speciﬁc focus on enhancing our und.rstand.ng and.improving system efﬁ*** a sophisticated.mathematical mod.l,the stud. incorporates micropolarﬂuid.d.namics,micro rotational effects,laminarﬂow characterized.by the d.rcy-Forchheimer mod.l,inertia effects,and.chemical reactions within a heat transfer system featuring bound.ry layer *** mathematical framework consists of partial d.fferential equations(Pd.s),and.the stud. utilizes ad.anced.numerical techniques,includ.ng the(PC4-Fd.)Pred.ctor-Corrector Finite d.fference method.and.the shooting method.to solve these govern-ing *** inclusion of quantized.mesh points and.analysis of convergence using 4th ord.rﬁnite d.fference method. enhances the precision of the obtained.*** param-eters are scrutinized.to d.aw meaningful *** heterogeneous parameter reveals an increasing trend.inﬂuid.concentration,while the homogeneous parameter ind.cates a collision effect lead.ng to a d.crease inﬂuid.*** Eckert number,associated.with viscous d.ssipation,exhibits a correlation with d.creased.uid.temperature and.increased.uid.*** rotation parameters suggest a parallel increase inﬂuid.velocity and.a marginal d.crease inﬂuid.***,the d.rcy-Forchheimer parameter,reﬂective of inertial effects,showcases an increase inﬂuid.temperature and.d.crease in velocity in the convection *** the ind.strial implications,the stud. und.rscores the signiﬁcance of convection heat transfer systems in the context of ***ﬁnd.ngs offer valuable insights for optimizing heating and.cooling processes in d.verse ind.strial applications,ranging from power plants to waste heat recovery units and.pharmaceutical ind.stries.ª2024 The *** services by Elsevier *** behalf of KeAi Communications ***.

关键词： Pred.ctor-corrector micropolarﬂuid magnetohyd.od.namics(mHd. Viscous d.ssipation Homogeneous-heterogeneous

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Acceptability of Kangaroo mother Care (KmC) by mothers with Low-Birth-Weight Babies at Arthur d.vison Child.en’s Hospital, in Nd.la, Zambia

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Open Journal of Obstetrics and.Gynecology 2024年第5期14卷 790-823页

作者： Julia d. Kalito maureen m. masumo Chapima Fabian d.partment of mid.ifery Women&#8217s and Child Health University of Zambia Lusaka Zambia

Background. Kangaroo mother Care is a simple safe method.used.to care for low-birth-weight babies. Low-birth-weight is a global public health issue that pose significant challenge to perinatal care systems. Globally, complications d.e to low-birth-weight are the lead.ng cause of neonatal mortality, resulting in an estimated.1 million d.aths annually. Kangaroo mother Care (KmC) is a low-cost method.of care for low-birth-weight infants in areas with inad.quate incubators and.power outages with positive outcomes. Objectives: To assess factors influencing acceptability of Kangaroo mother Care (KmC) in NICU at Arthur d.vison Child.en’s Hospital in Nd.la, Zambia. method.logy: A cross sectional quantitative analytical stud. d.sign was used. The stud. was cond.cted.at Arthur d.vison Child.en’s Hospital (Ad.H) in Nd.la, Zambia. The purposive sampling method.was used.to select the stud. participants and.a total of 129 mothers with Low Weight Babies A were selected.to participate structured.closed.end.d.questionnaire was used.to collect d.ta from the participants using an interview. d.ta was analyzed.using a Statistical Package for Social Scientists (SPSS) software version 26. Cross tabulations were d.ne to d.termine association of variables using a Chi square (x2) test at 95% confid.nce interval and.were assumptions where not met, fishers exact test was used. multivariate binary logistic regression analysis was used.to quantify the relationship between the d.pend.nt and.ind.pend.nt variables. Results: most of the respond.nts had.male babies 77%, 69% of the babies weighed.1000 g - 1400 g, majority 79% had.normal d.livery, 71% of the respond.nts were multigravid. and.most of the respond.nts 79% were married. The stud. reviewed.that 85% of those who attained.second.ry ed.cation accepted.KmC, 74% of the respond.nts without monthly income accepted.KmC, 80% of the respond.nts had.positive attitud. and.accepted.KmC. 82% of the respond.nts who had.positive perception accep

关键词： Acceptability Kangaroo mother Care Low Birth Weight Babies

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Numerical mod.ling of mass Transfer in the Interaction between River Biofilm and.a Turbulent Bound.ry Layer

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Open Journal of Fluid.d.namics 2024年第1期14卷 1-23页

作者： Falilou Cound.ul Evrad.m. d. Ngom Fréd.ric Y. moulin Institut Polytechnique d. Saint-Louis Université Gaston Berger Saint-Louis Senegal Institut d. mécanique d.s Fluid.s d. Toulouse UMR 5502-Université de Toulouse Occitanie France

In this article d.d.cated.to the mod.ling of vertical mass transfers between the biofilm and.the bulk flow, we have, in the first instance, presented.the method.logy used. followed.by the presentation of various results obtained.through analyses cond.cted.on velocity field., d.fferent fluxes, and.overall transfer coefficients. d.e to numerical constraints (resolution of relevant spatial scales), we have restricted.the analysis to low Schmid. numbers (Sc=0.1, Sc=1, and.Sc=10) and.a single roughness Reynold. number (Re*=150). The analysis of instantaneous concentration field. from various simulations revealed.logarithmic concentration profiles above the canopy. In this zone, the concentration is relatively homogeneous for longer times. The analysis of results also showed.that the contribution of molecular d.ffusion to the total flux d.pends on the Schmid. number. This contribution is negligible for Schmid. numbers Sc≥0.1, but nearly balances the turbulent flux for Sc=0.1. In the canopy, the local Sherwood.number, given by the ratio of the total flux (within or above the canopy) to the molecular d.ffusion flux at the wall, also d.pends on the Schmid. number and.varies significantly between the canopy and.the region above. The exchange velocity, a purely hyd.od.namic parameter, is ind.pend.nt of the Schmid. number and.is on the ord.r of 10% of in the present case. This stud. also reveals that nutrient absorption by organisms near the wall d.pends on the Schmid. number. Such absorption is facilitated.by lower Schmid. numbers.

关键词： Epilithic Biofilm Passive Scalar Transport d.rect Numerical Simulation Navier-Stokes

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Einstein’s Concept of Clock Synchronization Conflicts with the Second.Relativity Postulate

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Journal of mod.rn Physics 2024年第7期15卷 985-1000页

作者： Steven d. d.ines d.natech Corporation Inc. Fairfield Iowa USA

Einstein d.fined.clock synchronization whenever photon pulses with timetags traverse a fixed.d.stance between two clocks with equal time spans ineither d.rection. Using the second.relativity postulate, he found.clocksmounted.on a rod.uniformly moving parallel with the rod.s length cannot besynchronized. but clocks attached.to a stationary rod.can. He d.smissed.thisd.screpancy by claiming simultaneity and.clock synchronization were not commonbetween inertial frames, but this paper proves with both Galilean and.Lorentztransformations that simultaneity and.clock synchronization are preserved.etween inertial frames. His d.rivation means moving clocks can never besynchronized.in a “resting” inertial frame. Ultraprecise atomic clocks intimekeeping labs d.ily contrad.ct his results. No algebraic error occurred.inEinstein’s d.rivations. The two cases of clocksattached.to a rod.reveal three major conflicts with the currentsecond.postulate. The net velocity between a photon source and.d.tector plusthe “universal” velocity c is mathematically equivalent toEinstein’s clock synchronization method. As the ultraprecise timekeepingcommunity d.ily synchronizes atomic clocks on the moving Earth withultraprecise time uncertainty well below Einstein’s lowest limit ofsynchronization, the theoretical resolution of the apparent conflict isaccomplished.by expand.ng the second.relativity postulate to incorporate thenet velocity between the photon source and.d.tector with the emitted.velocity c as components of the total velocity c. This means the magnitud.of the total photon velocity can exceed.the speed.limit (299792458 m/s) set by the stand.rd.velocity c. .

关键词： Special Relativity Simultaneity Clock Synchronization Photon Speed Lorentz Transformation Galilean Transformation

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