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A decentralized data evaluation framework in federated learning

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Blockchain(Research and Applications) 2023年第4期4卷 14-23页

作者： Laveen bhatia Saeed Samet School of Computer Science University of WindsorWindsorN9B 3P4OntarioCanada

Federated Learning(FL)is a type of distributed deep learning framework in which multiple devices train a local model using local data,and the gradients of the local model are then sent to a central server that aggregates them to create a global *** type of framework is ideal where data privacy is of utmost importance because the data never leave the local ***,a major concern in FL is ensuring the data quality of local training *** there is no control over the local training data,ensuring that the local model is trained on clean data becomes challenging.A model trained on poor-quality data can have a significant impact on its *** this paper,we propose a decentralized approach using blockchain to ensure local model data *** use miners to validate each local model by checking its accuracy against a secret testing *** is done using a smart contract that the miners invoke during the mining *** local model is aggregated with the global model only if it passes a preset accuracy *** test our proposed method on two datasets:the Brain Tumor Classification dataset from Kaggle,comprised of 7000 MRI images divided into two classes(Tumor/No Tumor),and the Medical MNIST dataset,which includes 58,954 images classified into six different classes:AbdomenCT,BreastMRI,ChestCT,Chest X-ray,Hand X-ray,and *** results show that our method outperforms the original FL approach in all experiments.

关键词： Federated learning Blockchain Decentralized federated learning Decentralized data evaluation Smart contracts

Bifurcation analysis and optimal control of an epidemic model with limited number of hospital beds

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International Journal of Biomathematics 2023年第4期16卷 229-253页

作者： A.K.Misra jyoti Maurya Department of Mathematics Institute of Science Banaras Hindu UniversityVaranasi 221005India

This paper deals with a three-dimensional nonlinear mathematical model to analyze an epidemic's future course when the public healthcare facilities,specifically the number of hospital beds,are *** feasibility and stability of the obtained equilibria are analyzed,and the basic reproduction number(Ro)is *** show that the system exhibits transcritical *** show the existence of Bogdanov-Takens bifurcation,we have derived the normal *** have also discussed a generalized Hopf(or Bautin)bifurcation at which the first Lyapunov coefficient *** show the existence of saddle-node bifurcation,we used Sotomayor's ***,we have identified an optimal layout of hospital beds in order to control the disease with minimum possible *** optimal control setting is studied analytically using optimal control theory,and numerical simulations of the optimal regimen are presented as well.

关键词： Hospital beds Hopf-bifurcation saddle-node bifurcation transcritical bifurcation Bogdanov-Takens bifurcation optimal control

Heavy Metal Accumulation in Medicinal Plants Collected from Environmentally Different Sites

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Biomedical and Environmental Sciences 2008年第4期21卷 319-324页

作者： jyoti BARTHWAL SMITHA NAIR POONAM KAKKAR Herbal Research Section Industrial Toxicology Research Centre

Objective To estimate the heavy metal content in soil and selected medicinal plants procured from environmentally different sites of the same city. Methods Soil and plant samples of Abutilon indicum, Calotropis procera, Euphorbia hirta, Peristrophe bycaliculata, and Tinospora cordifolia were collected from 3 environmentally different sites of the city： heavy traffic area （HTA）, industrial area （IA）, and residential area （RA）. Pb by inductively coupled plasma emission spectrometry and compared Cd, Cr, and Ni were estimated in soil and plant samples Results The level of heavy metal was higher in soil than in plant parts studied. Accumulation of heavy metals varied from plant to plant. Pb was the highest in Calotropis procera root from HTA site and the lowest in Peristrophe bycaliculata whole plant from IA site. It was also lower in residential area than in heavy traffic area. Conclusion The level of heavy metal content differed in the same medicinal plant collected from environmentally different sites of the same city. Thus, it reiterates our belief that every medicinal plant sample should be tested for contaminant load before processing it further for medication.

关键词： Heavy metals Medicinal plants Lead Cadmium Chromium Herbal raw material

Essential role of monocytes and macrophages in the progression of acute pancreatitis

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World Journal of Gastroenterology 2010年第32期16卷 3995-4002页

作者： Pratima Shrivastava Madhav bhatia Department of Pharmacology National University of SingaporeSingapore 117597Singapore Department of Pathology University of OtagoChristchurch 8140New Zealand

Acute pancreatitis(AP) is an inflammatory condition of the pancreas caused by an imbalance in factors involved in maintaining cellular *** events in AP occur within acinar cells accompanied by other principal contributors to the inflammatory response *** endothelial cells,immunocytes(granulocytes,monocytes/macrophages,lymphocytes) and ***/macrophages are important inflammatory mediators,involved in the pathophysiology of AP,known to reside in the peritoneal cavity(in the vicinity of the pancreas) and in peripancreatic *** studies suggested that impaired clearance of injured acini by macrophages is associated with an altered cytokine reaction which may constitute a basis for progression of *** review focuses on the role of monocytes/macrophages in progression of AP and discusses f indings on the inflammatory process involved.

关键词： Acute pancreatitis Monocytes Peritoneal macrophages Alveolar macrophages Kupffer cells

Influence of heat treatment on the structural and optical properties of SrGd_2O_4:Eu^(3+) phosphor

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Journal of Rare Earths 2015年第10期33卷 1040-1050页

作者： jyoti Singh Pankaj Kr.Baitha J.Manam Department of Applied Physics Indian School of Mines

Novel red emitting Eu3＋ doped SrGd2O4 phosphors were synthesized by homogeneous precipitation method followed by a subsequent combustion process at various temperatures. A systematic study on the consequent structural evolution and optical properties were investigated as a function of various processing temperatures. With the enhancement of processing temperature, SrGd2O4 phosphor showed a gradual transformation from a mixed phase to monophasic nature, with minimized volatile imptwities. The microscopic images exhibited homogeneous aggregates of varying shapes and sizes with an average length of about 0.5-5μl. Eu3＋ doped SrGd2O4 phosphors prepared at low temperatures, showed miserably low values of red emission upon UV excitation owing to the presence of volatile impurities. The SrGd2O4：Eu3＋ phosphors prepared at relatively high temperature exhibited strong red-orange emissions due to homogeneously occupied Eu3＋ ions in the host lattice. The dominant red to orange （R/O） emission intensity ratios and CIE parameters of EU3＋ ions substantiated the site occupation of higher asymmetry sites of Gd3＋ ions and the strong covalent nature. Dexter theory and critical distance calculation suggested that the dipole-dipole interaction could be responsible for the concentration quenching of Eu3＋（4 mol.%） doped SrGd2O4 phosphors. Elevated physical and chemical durability and stable photoluminescence made these phosphors suitable for white LEDs and other display applications.

关键词： optical materials chemical synthesis X-ray diffraction luminescence rare earths

Base editing: a promising tool to rescue spinal muscular atrophy

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Signal Transduction and Targeted Therapy 2023年第10期8卷 4436-4438页

作者： Priyanka bhatia Jared Sterneckert Center for Regenerative Therapies TU Dresden(CRTD) Technische Universität(TU)DresdenDresdenGermany Medical Faculty Carl Gustav Carus of TU Dresden DresdenGermany

In a new Science publication,Arbab and colleagues observe a substantial improvement in life span and motor functions of adenosine-base edited spinal muscular atrophy(SMA)mice with restored endogenous survival motor neuron(SMN)protein expression and regulation.1 This study provides proof-of-principle for the use of adenosine base editing(ABE)as a possible one-time,permanent therapy for SMA.

关键词： atrophy muscular endogenous

Leadless pacemakers： a contemporary review

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Journal of Geriatric Cardiology 2018年第4期15卷 249-253页

作者： Neal bhatia Mikhael El-Chami Department of Medicine Division of Cardiology Section of Electrophysiology Emory University School of Medicine Atlanta USA

1 Introduction Over one million cardiac pacemakers are implanted every year worldwide,[11 of which approximately 200,000 are implanted in the United States alone.121 Combined with an aging population and increasing pacing indications, these numbers are expected to grow. Since the first pacemaker implantation in 1950s, cardiac pacemaker technology has rapidly advanced. Reduction in generator size, increased battery longevity, quality of pacemaker leads, algorithmic and rate responsive programming-all have revolutionized and transformed the implantation and management of transvenous cardiac pacemaker （TV-PPM）.

关键词： Leadless pacemakers Micra Nanostim Perforation

Designing an On-board Charger to Efficiently Charge Multiple Electric Vehicles

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中国电气工程学报(英文) 2023年第2期9卷 38-56页

作者： jyoti Gupta Rakesh Maurya Sabha Raj Arya Department of Electrical Engineering Sardar Vallabhbhai National Institute of TechnologySurat 395007India

An on-board charger for efficiently charging multiple battery-operated electric vehicles(EVs)is *** has evolved as a single-input dual-output(SIDO)integrated boost-single ended primary inductor converter(SEPIC)fly-back converter,offering cost-effectiveness,reliability,and higher efficiency compared to conventional chargers with equivalent *** proposed system includes an additional regulated output terminal,in addition to an existing terminal for charging the EV battery of a 4-wheeler,which can be used to charge another EV battery,preferably a *** the aid of control techniques,unity power factor operations are obtained during constant-voltage(CV)/constant-current(CC)charging for the grid-to-vehicle(G2V)operating *** mathematical modelling analysis,the proposed system is developed in a Matlab/Simulink environment,and the results are validated in a real-time simulator using *** proposed system is employed for charging the batteries of two EVs with capacities of 400 V,40 A·h and 48 V,52 A·h for the 4-wheeler and 2-wheeler,*** performance is investigated under different operating modes and over a wide range of supply voltage variations to ensure safe and reliable operation of the charger.

关键词： Continuous conduction mode(CCM) CV/CC electric vehicles(EVs) power factor correction(PFC) single input dual output(SIDO) state of charge(SOC)

A new modified group explicit iterative method for the numerical solution of time dependent viscous Burgers’equation

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International Journal of Modeling, Simulation, and Scientific Computing 2014年第2期5卷 112-129页

作者： jyoti Talwar R.K.Mohanty Department of Mathematics Faculty of Mathematical Sciences University of DelhiDelhi-110007India Department of Applied Mathematics South Asian University Akbar BhawanChanakyapuriNew Delhi-110021India

In this article,we discuss a new smart alternating group explicit method based on off-step discretization for the solution of time dependent viscous Burgers’equation in rectangu-lar *** convergence analysis for the new iteration method is discussed in *** compared the results of Burgers’equation obtained by using the proposed iterative method with the results obtained by other iterative methods to demonstrate computationally the efficiency of the proposed method.

关键词： Nonlinear parabolic equation off-step variable mesh discretization rectangu-lar and polar coordinates group explicit method Burgers'equation Reynolds number