bigram

This is a table of type bigram and their frequencies. Use it to search & browse the list to learn more about your study carrel.

bigram frequency
novel coronavirus218
differential equations173
reproduction number151
sir model146
infected individuals144
optimal control141
fractional order141
infectious diseases125
fractional derivative123
social distancing121
basic reproduction118
confirmed cases112
mathematical model111
coronavirus disease106
epidemic model105
time series91
transmission dynamics90
public health90
infected population86
free equilibrium84
epidemic spreading83
new cases81
infected people80
asymptotically stable79
endemic equilibrium73
proposed model73
total number73
machine learning70
infected cases67
deep learning66
infectious disease62
stock markets62
fractional differential59
chaos solitons59
mathematical models59
solitons fractals59
doc id58
fractals doi58
cord uid58
disease transmission58
susceptible individuals57
control measures57
model parameters56
total population53
seir model52
initial conditions51
susceptible population50
authors declare49
contact tracing49
control strategies49
sensitivity analysis47
cryptocurrency markets47
real data46
respiratory syndrome45
incubation period44
recovery rate43
world health42
health organization42
backward bifurcation42
per day40
financial interests39
personal relationships39
locally asymptotically39
fractional calculus39
daily new38
mathematical modelling38
mutation rate38
see table37
acute respiratory37
numerical solution36
mathematical modeling36
ordinary differential36
different countries36
modelling study36
fractional derivatives35
information diffusion35
south korea35
differential equation35
caputo fractional35
social media35
parameter values34
numerical simulations34
infectious individuals33
brownian motion33
severe acute32
death rate32
neural network32
health care32
white noise32
transmission rate32
growth rate31
epidemic threshold31
high risk30
competing financial30
asymptomatic infectious30
epidemic peak29
case study29
globally asymptotically29
disease information29
mortality rate29
equilibrium point29
model based28
work reported28
known competing28
large number28
asymptomatic individuals27
control problem27
reproductive number27
epidemic models27
contact rate27
risk group27
slow system27
disease free26
epidemic dynamics26
cumulative number26
sir epidemic26
reported cases26
dynamical systems25
fractional optimal25
infected individual25
hiv aids25
hubei province25
incidence rate24
recovered individuals24
recovered cases24
failure rate24
artificial intelligence24
next generation24
parameter estimation24
epidemiological data24
exposed individuals24
coronavirus outbreak24
mitigation strategies23
disease spread23
epidemiological models23
driven analysis23
asymptomatic infected23
vaccine failure23
new fractional23
derivative order23
disease dynamics23
generation matrix23
asymptomatic cases23
training data22
heilongjiang province22
equilibrium points22
strict social22
global stability22
mathematical theory22
early detection22
control strategy21
infected person21
arima model21
health interventions21
state variables21
ray images21
vaccinated individuals21
asymptomatic infectives21
corona virus21
singular kernel20
different values20
social distance20
see text20
operational matrix20
numerical solutions20
syndrome coronavirus20
time period20
pharmaceutical interventions20
april th20
second wave20
time step20
data set19
time delay19
united states19
numerical simulation19
international spread19
asymptomatic patients19
moving average19
transmission model19
initial condition19
symptomatic infected18
situation report18
order model18
order differential18
active cases18
herd immunity18
population size18
jacobian matrix18
fractional white18
asymptotic stability18
isolation room18
low risk18
infection cases18
stochastic model18
susceptible people18
zone mobilization17
second equation17
preventive measures17
virus disease17
infectious cases17
logistic model17
unique solution17
stability analysis17
mean value17
fractional model17
recurrent mobility17
affected countries17
infection rate16
public places16
early phase16
positive equilibrium16
spreading dynamics16
numerical results16
confirmed covid16
case fatality16
riesz wavelets16
immune system16
among individuals16
virus infection16
new infection16
characteristic equation16
sirs model16
raw data16
financial crisis16
infected patients16
susceptible individual16
early dynamics16
time interval16
social networks16
wbf model15
lyapunov function15
potential domestic15
social contacts15
risk assessment15
initial value15
fatality rate15
third equation15
real world15
ncov outbreak15
vaccination behavior15
epidemic spread15
neural networks15
mathematical analysis15
outbreak originating15
infected class15
sidarthe model15
whole population15
exposed class15
two types15
new covid14
quarantine control14
symptomatic infectious14
global sensitivity14
time forecasts14
turning point14
new coronavirus14
caputo derivative14
confirmed infected14
integer order14
fractional brownian14
two different14
lyapunov exponents14
convolutional neural14
latent period14
stochastic differential14
compartmental models14
exponential growth14
daily growth14
available data14
international stock14
new data14
complex networks14
quarantine measures14
inter zone13
epidemic disease13
final size13
numerical method13
chest ct13
order sidarthe13
asymptotically infected13
one hand13
mild cases13
moulton method13
new infected13
infected i13
different fractional13
i ic13
epidemic diseases13
chaotic behavior13
apen variance13
operating procedures13
various countries13
rapid test13
beltrami operator13
fabrizio fractional13
positive cases13
observed data13
become susceptible13
adaptive process13
initial values13
infected density13
given time13
infection rates13
compartmental model13
infected cells13
policy makers13
fractional differentiation13
simulation results13
apen mean12
legendre polynomial12
initial data12
disease model12
pandemic lle12
lstm networks12
class i12
markov chain12
average time12
time evolution12
relative cost12
stochastic epidemic12
nonlinear fractional12
fractional integral12
incremental learning12
local stability12
stationary distribution12
epidemiological model12
reproduction numbers12
data sets12
long time12
series forecasting12
pandemic apen12
lockdown period12
recorded data12
wick product12
causal variables12
networked population12
inflection point12
coupled slow12
control variables12
pandemic covid12
peak number12
sirsi model12
published data12
natural death12
widely used12
disease outbreaks12
days ahead12
learning techniques12
dynamical system12
lle mean12
health system12
two positive12
numerical scheme12
mobility pattern12
biological systems12
condom use12
lockdown rate12
competing interests12
lle variance12
saturated incidence12
control problems12
transfer learning11
hybrid model11
equity markets11
disease will11
lancet infectious11
novel corona11
epidemic data11
role models11
viral infection11
infected players11
using mathematical11
following theorem11
stochastic models11
total infected11
containment rate11
host dynamics11
model predictions11
series data11
state individuals11
ebola virus11
negative real11
new infections11
clinical characteristics11
pure birth11
estimated parameters11
ct images11
five different11
even though11
necessary conditions11
order derivative11
cases data11
average number11
population fraction11
cases reported11
learning approach11
decision making11
update rule11
without singular11
first equation11
global pandemic11
nucleotide mutation11
driven adaptive11
classic sir11
using machine11
infectious individual11
cruise ship11
lockdown effect11
health authorities11
basic reproductive11
pairwise approach11
common areas11
individuals will11
following result11
order derivatives11
using deep11
boundary arc11
results show11
mean time11
human population11
different strategies11
quarantine actions11
asymptomatic class11
many countries11
fractional operators10
south africa10
transition rate10
incubation time10
series analysis10
life expectancy10
baleanu fractional10
surge periods10
smoothed pseudo10
theoretical results10
east respiratory10
genomic sequence10
tridip sardar10
becomes available10
approximate entropy10
global health10
intensive care10
cumulative cases10
detected infected10
hybrid arima10
discussion rate10
first case10
model using10
interests personal10
individuals become10
spectral radius10
coronavirus covid10
epidemic outbreak10
proposed fractional10
pandemic period10
generalized adams10
myopic update10
behavioral change10
aids epidemic10
corresponding author10
th may10
lstm model10
human transmission10
transmission risk10
mutation rates10
become infected10
dashed curves10
people will10
containment measures10
based study10
original draft10
reported data10
will eventually10
cases will10
epidemic duration10
incidence data10
numerical analysis10
law growth10
epidemic topic10
face masks10
dynamic model10
following financial10
type models10
developing countries10
power law10
different types10
publicly available10
interactive topics10
middle east10
confinement measures10
cumulative case10
infected persons10
isolated slow10
forecasting model10
countries around10
princess cruise9
learning technique9
people increases9
learning based9
real parts9
following form9
attack rate9
endemic equilibria9
constant rate9
tests per9
epidemic control9
first days9
imposed quarantine9
effective contact9
will also9
death toll9
till may9
correlation coefficient9
diamond princess9
mean square9
clinical features9
mathematical epidemiology9
topic discussion9
null hypothesis9
free networks9
expected number9
care facilities9
based models9
unreported symptomatic9
term memory9
female sex9
probability distribution9
sei i9
projection coordinates9
different scenarios9
mobility possibility9
every day9
total cases9
data becomes9
case projection9
many researchers9
potential competing9
zika virus9
wuhan city9
infectious rate9
short time9
covid epidemic9
mainland china9
hiv infection9
human mobility9
global asymptotic9
see appendix9
time markov9
memory effect9
epidemic outbreaks9
disease burden9
drug discovery9
hopkins university9
network structure9
informed individuals9
gene sequence9
proposed method9
short term9
value problem9
population will9
novel covid9
likely due9
maximum number9
experimental results9
autoregressive integrated9
liouville fractional9
riesz wavelet9
time span9
integrated moving9
law network9
early stage9
sex workers9
complete lockdown9
coronavirus infections9
proposed hybrid9
distancing measures9
actual data9
learning model9
recent years8
virus spreads8
i will8
first time8
square error8
th january8
rate due8
gives us8
time periods8
dengue fever8
population dynamics8
model without8
epidemic will8
stereographic projection8
time dependent8
optimization problem8
good agreement8
receding horizon8
will help8
control theory8
complex dynamics8
population due8
learning algorithm8
stock market8
effective reproduction8
situation reports8
allows us8
first two8
collocation method8
value function8
images using8
numerical experiments8
two time8
death cases8
stability results8
current covid8
every days8
transmission rates8
modified seir8
partial differential8
effective way8
direct contact8
current pandemic8
estimated parameter8
deterministic model8
network model8
supplementary material8
effectiveness analysis8
term forecasts8
proposed approach8
model simulation8
infected pneumonia8
adaptive networks8
three categories8
susceptible class8
well known8
sk shahid8
initial population8
preliminary estimation8
time steps8
following system8
objective functional8
physical distancing8
following equation8
second derivative8
infections generated8
previous studies8
vaccine efficacy8
natural science8
newly infected8
caputo sense8
ongoing covid8
coronavirus pandemic8
disease spreading8
epidemic prevalence8
early transmission8
review editing8
deep convolutional8
pandemic outbreak8
least one8
based transmissibility8
present study8
overall india8
leffler kernel8
comparative study8
science foundation8
refinable functions8
quarantine effectiveness8
virus spread8
bibliometric analysis8
spreading process8
lyapunov functions8
symptomatic individuals8
based forecasting8
intervention strategies8
cases per8
epidemic peaks8
protective measures8
adaptive network8
johns hopkins8
known infectives8
long short8
acquired immunity8
cumulative confirmed8
case incidence8
estimated value8
big data8
codon mutation8
computational simulations8
recovered person8
real time8
patients infected8
using real8
seir epidemic8
logistic curve8
permanent immunity8
major role7
observed daily7
derivative without7
largest lyapunov7
disease caused7
control measure7
infection probability7
sir models7
three different7
infected case7
become cure7
social network7
section presents7
versus time7
search volume7
forecasting covid7
first day7
support vector7
isolation control7
incidence curve7
real part7
generalized logistic7
effective strategy7
hiv disease7
approach based7
adaptive behavior7
human behavior7
factors affecting7
clinical symptoms7
prediction error7
see also7
statistical methods7
fast time7
recurrent neural7
epidemiological parameters7
sensitivity indices7
nonlinear incidence7
new model7
regression tree7
quarantined individuals7
necessary optimality7
model will7
using lstm7
deep transfer7
new mathematical7
optimal policy7
partial rank7
time window7
different parameters7
stable whenever7
new york7
dependent control7
best fit7
mild symptoms7
active infected7
healthy cells7
sars coronavirus7
rapid testing7
bifurcation analysis7
order systems7
contact network7
reduce social7
present paper7
residual series7
infected compartment7
lipschitz condition7
stochastic process7
recovered population7
fast system7
epidemic starts7
million people7
maximum principle7
nonsingular kernel7
commonly used7
references therein7
unique endemic7
strict lockdown7
isolated individuals7
baleanu derivative7
learning algorithms7
laplace transform7
viral load7
projection using7
population density7
vaccination cost7
may th7
dimensional sphere7
data available7
birth process7
previous section7
risk factors7
final state7
recent studies7
reported symptomatic7
matrix method7
optimality conditions7
boundary control7
general incidence7
learning approaches7
saudi arabia7
actions taken7
world data7
least square7
boundary value7
rank correlation7
optimal controls7
imperfect lockdown7
unaware infectives7
continuously evolving7
total cumulative7
regression model7
total infections7
major cities7
leffler function7
recovery rates7
unique positive7
hospitalized patients7
long term7
parameter estimates7
exact solution7
northern italy7
statistical analysis7
distribution function7
days since7
updated estimation7
age group7
coronavirus epidemic7
green curve7
qualitative analysis7
us consider7
performance measures7
face mask7
unquarantined asymptomatic7
compulsory containment7
positive equilibria7
march th7
new approach7
vaccination strategy7
accumulated number7
will become7
logistic growth7
disease control7
reported infectious7
control reproduction7
exposed people7
integral equations7
center manifold7
random walk7
per unit7
forecasting using7
following fractional7
order system7
interaction radius7
main results7
global financial7
interactive topic6
will lead6
many governments6
fourth equation6
computed tomography6
memory impact6
hong kong6
governmental action6
two months6
discrete time6
learning models6
induced optimization6
root mean6
local asymptotic6
stochastic simulations6
data curation6
will decrease6
european countries6
different states6
continuous curves6
preventive isolation6
dt corr6
without control6
model parameter6
human body6
external factors6
positive constants6
integral equation6
currently infected6
intellectual property6
infection dynamics6
three major6
population i6
fractional operator6
infection transmission6
sis model6
control interventions6
blood samples6
disease outbreak6
different ways6
compartment i6
forecasting models6
will increase6
event rate6
ten days6
data points6
respiratory droplets6
yule process6
using reduction6
order epidemic6
outbreak size6
host population6
quarantine period6
type fractional6
epidemic analysis6
data used6
induced death6
fractional integro6
overall population6
reproduction ratio6
series model6
spread among6
western countries6
cases generated6
dynamical behavior6
control function6
hypercube sampling6
limited resources6
individual may6
positive covid6
driven receding6
health measures6
following expression6
following results6
three distinct6
model dynamics6
african countries6
infectious class6
input variables6
infection will6
forward sensitivity6
gaussian process6
recovered patients6
different population6
results found6
classical sir6
medical professionals6
overall number6
longer time6
equation model6
hospital beds6
cumulative reported6
asymptomatic duration6
every time6
health systems6
individual reaction6
adjusted estimation6
series prediction6
social connections6
lyapunov exponent6
per people6
controlling covid6
tamil nadu6
undocumented infection6
aerosol sanitizer6
model predicts6
steady state6
waiting time6
following equations6
exponential decay6
individual i6
poisson distribution6
coronavirus infection6
homogeneous mixing6
fatality rates6
epidemic growth6
hand side6
antiviral drugs6
sensitive parameters6
symptomatic cases6
switching times6
vkr chimmula6
noise intensity6
better understanding6
seir models6
based model6
order models6
disease persists6
control policy6
population phases6
local outbreak6
isolation factor6
chaotic systems6
wide interventions6
model used6
differential operators6
control analysis6
time fractional6
will reduce6
two groups6
national natural6
heterogeneous populations6
data collected6
endemic disease6
two scenarios6
infected country6
approximate solution6
may help6
three countries6
vaccine cost6
various operating6
sensitivity index6
late december6
per capita6
susceptibility feedback6
wearing face6
declared covid6
order sei6
spreading processes6
data driven6
virus tests6
factors like6
critical model6
five countries6
disease characteristics6
new outbreak6
confirmed case6
shahid nadim6
degree distribution6
significant parameters6
human liver6
health emergency6
induced mortality6
vaccination policy6
zero eigenvalue6
remedial steps6
research work6
standard sir6
distancing rule6
time system6
will provide6
time data6
following two6
heat transfer6
virus will6
coupling within6
dynamic behavior6
novel approach6
new training6
evolving training6
remains constant6
one month6
contact networks6
three months6
manifold theory6
stochastic calculus6
five days6
social mixing6
natural immunization6
mapping function6
systematic review6
epidemics trend6
density function6
secondary infection6
logistic equation6
population biology6
public opinion6
virus test6
restrictive measures6
hospitalized infected6
normalized forward6
systems biology6
model calibration6
data analysis6
epidemic situation6
rna virus6
vector regression6
order calculus6
lundberg process5
chaotic system5
population phase5
people i5
control model5
publicly reported5
detailed study5
singular fractional5
new study5
new type5
see figs5
infection facilitates5
infection period5
based approaches5
greatest potential5
invariant set5
testing positive5
horizon control5
hemorrhagic fever5
contacts among5
us denote5
day basis5
wavelet function5
since april5
large set5
numerical approximation5
weather variables5
display mode5
pcr testing5
multiplex networks5
driven infectious5
predicting covid5
constant value5
better performance5
artificial neural5
analysis method5
generated using5
may also5
air travel5
data mining5
potential impact5
quarantine class5
will use5
nonlinear system5
positive root5
compartmental mathematical5
four countries5
latin hypercube5
least squares5
higher compared5
real contagion5
influential parameters5
stochastic sir5
hybridized mode5
next section5
extended legendre5
sample forecasts5
epidemic trend5
limited data5
host will5
controlled natural5
john hopkins5
bifurcation phenomenon5
boundary conditions5
deep neural5
relevant departments5
clusters distributed5
infectious period5
significantly affect5
one sentence5
financial support5
vanishing moments5
may occur5
second interval5
decision makers5
segmented poisson5
parameters using5
individuals greatly5
integral operators5
optimal solution5
first stage5
large scale5
also shown5
million deaths5
proposed sirsi5
unknown parameters5
results obtained5
voluntary vaccination5
vaccine production5
delayed sir5
memory cell5
future cases5
dynamics model5
prompt isolation5
specify contribution5
deterministic models5
complex models5
endemic state5
time profile5
two weeks5
world problems5
also given5
wuhan novel5
using three5
using fractional5
model equations5
nationwide lockdown5
infected covid5
natural recovery5
notified cases5
transfer model5
covid cases5
infectious population5
organizing maps5
important parameters5
strict control5
birth rate5
imperfect vaccination5
peak time5
research area5
temporal components5
individuals increases5
early epidemic5
term forecasting5
advises orders5
model takes5
future work5
sufficiently small5
respiratory illness5
algorithm based5
optimization algorithm5
model described5
spreading probability5
future covid5
structured models5
healthy individuals5
important role5
singular arc5
detection probability5
global dynamics5
will give5
asymptomatic carrier5
poisson process5
present research5
vaccination game5
march nd5
weakly singular5
threshold quantity5
discharged recovered5
scientific production5
time fde5
wavelet systems5
based tools5
rapid dissemination5
classical seir5
disease models5
model analysis5
submission system5
fractional orders5
implementing control5
recovered class5
deterministic chaos5
key parameters5
visualization display5
ai technology5
medical experts5
lockdown efficacy5
population till5
pharmaceutical scenarios5
pandemic due5
less effective5
induced errors5
human behaviour5
epidemiological characteristics5
several countries5
mathematical biology5
analysis using5
control set5
time scale5
partial derivatives5
network visualization5
gets infected5
scientific databases5
intra zone5
also considered5
distribution functions5
cfd analysis5
pcr tests5
heat kernel5
actual number5
spatial spread5
imported cases5
state space5
transition density5
model considers5
fixed point5
drug development5
active infections5
different times5
series datasets5
susceptible populations5
agent i5
mitigation scenarios5
learning methods5
test results5
nonlinear systems5
spread rate5
january th5
significant impact5
like covid5
standard deviation5
poisson model5
recruitment rate5
exponential increase5
random variables5
simple sir5
increasing number5
sufficient conditions5
substantial undocumented5
two equations5
heterogeneous networks5
longer period5
stochastic sirs5
daily tests5
short period5
system given5
spherical coordinates5
symptomatic class5
input data5
monte carlo5
measures adopted5
aids people5
measures taken5
secondary infections5
first order5
better understand5
purely asymptomatic5
order sir5
reduce covid5
time estimation5
critical parameters5
initial phase5
government actions5
much faster5
early stages5
negative initial5
viral pneumonia5
becomes susceptible5
positive constant5
registered infected5
much smaller5
hospitalized class5
predictive mathematical5
travel restrictions5
please see5
different time5
capacity constraints5
infectious spread5
countries like5
rapid tests5
morocco registers5
cumulative total5
social circle5
vaccination strategies5
infection age5
exposed population5
fractional modelling5
reported confirmed5
one root5
model shows5
immune response5
grant nos5
new year5
scratch every5
topic search5
editorial submission5
immunization rate5
scientific literature5
disease status5
asymptomatic carriers5
using data5
clinical blood5
volterra integral5
awareness source5
optimal quarantine5
control profile5
four control5
model given5
forget gate5
host virus5
contagion dynamics4
quarantined infectious4
contacts tracing4
topic popularity4
disease prevention4
jacobo aguirre4
term predictions4
cases increases4
home advises4
tests applied4
huge amount4
without loss4
government officials4
decision support4
getting infected4
information generation4
severe respiratory4
exposed compartment4
multiplicative fractional4
also presented4
scientific community4
simulations show4
lockdown measure4
formal analysis4
information spreading4
seira model4
growth model4
transition sst4
image processing4
method based4
various fractional4
stochastic systems4
will remain4
develop immunity4
pcr test4
individual vaccination4
united kingdom4
field approach4
rows represents4
aware infected4
much higher4
china early4
laboratory tests4
among people4
distancing policy4
key features4
mental health4
sufficient condition4
model system4
stochastic mathematical4
governmental actions4
different control4
epidemic processes4
similar way4
mutually exclusive4
statistical tests4
distance correlation4
heterogeneous population4
mobilization factors4
two states4
random forest4
great interest4
section discusses4
health concern4
novel model4
economic crisis4
response function4
influenza epidemics4
simplest sir4
ib satisfying4
mathematical formulation4
functional form4
caputo operator4
pneumonia associated4
first four4
simulation result4
solved using4
haggle network4
always exists4
infection model4
equations numerical4
quadratic approximation4
new fractal4
initially infected4
small increase4
model proposed4
basic sir4
mean number4
worth noting4
worst hit4
mathematical study4
refinable masks4
hub nodes4
input gate4
international journal4
temporal evolution4
many cases4
urn model4
personal hygiene4
care unit4
probability function4
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