LitCovid-sentences  

PMC:7175914 / 4553-10222 JSONTXT 8 Projects

Annnotations TAB TSV DIC JSON TextAE

Id Subject Object Predicate Lexical cue
T29 0-33 Sentence denotes SEIRQ model, data and methodology
T30 35-46 Sentence denotes SEIRQ model
T31 47-449 Sentence denotes In this study, according to the characteristics of the COVID-19 transmission, the whole population at time t is divided into seven compartments which include the susceptible individuals S(t), exposed individuals E(t), infectious individuals I(t), removed individuals R(t), quarantined susceptible individuals S q(t), quarantined exposed individuals E q(t) and quarantined infectious individuals I q(t).
T32 450-600 Sentence denotes The COVID-19 disease is transmitted from I(t) to S(t) with the incidence rate of β, and from E(t) to S(t) with the incidence rate of σβ, respectively.
T33 601-680 Sentence denotes The susceptible individuals S(t) is partly quarantined with the rate of q 1(t).
T34 681-892 Sentence denotes We assume that exposed individuals E(t) and quarantined exposed individuals E q(t) are transmitted to infectious individuals I(t) and quarantined infectious individuals I q(t) with the same transition rate of ν.
T35 893-994 Sentence denotes The quarantined rates of exposed individuals E(t) and infectious individuals I(t) are q 1(t) and q 3.
T36 995-1299 Sentence denotes The death rate induced by the COVID-19 disease is α in both infectious individuals I(t) and quarantined infectious individuals I q(t) which removed to the removed individuals R(t) . γ(t) is the recovery rate of quarantined infected individuals I q(t) which is the mainly part of removed individuals R(t).
T37 1300-1425 Sentence denotes Moreover, based on the population migration, we assume that the input population and output population have constant numbers.
T38 1426-1776 Sentence denotes Susceptible individuals S(t), exposed individuals E(t) and infectious individuals I(t) have their respective input individuals of p 1(t)A(t), p 2(t)A(t) and p 3(t)A(t), and the parameters p i(t), i  = 1, 2, 3 are the rates of susceptible individuals, exposed individuals, infectious individuals in the total input number of A(t) from other provinces.
T39 1777-1912 Sentence denotes The output population are B 1, B 2 and B 3 for the susceptible individuals S(t), exposed individuals E(t), infectious individuals I(t).
T40 1913-2010 Sentence denotes The COVID-19 disease transmission and population migration are demonstrated by Fig. 1 in details.
T41 2011-2063 Sentence denotes Figure 1 Flowchart of COVID-19 SEIRQ epidemic model.
T42 2064-2395 Sentence denotes The SEIRQ epidemic model can be described by the following system of ordinary differential equations(1) S′=p1(t)A(t)−βSI−σβSE−q1(t)S−B1,E′=p2(t)A(t)+βSI+σβSE−νE−q2(t)E−B2,I′=p3(t)A(t)+νE−q3I−αI−B3,R′=γ(t)Iq+αI+αIq,Sq′=q1(t)SEq′=q2(t)E−νEqIq′=q3I+νEq−γ(t)Iq−αIqwhere the prime (′) denotes the differentiation with respect to time t.
T43 2396-2493 Sentence denotes Here, parameters 0 <  β, ν, γ(t), α  < 1 and the quarantined rates 0 ≤  q 1(t), q 2(t), q 3  ≤ 1.
T44 2494-2613 Sentence denotes All the initial values of different individual groups: S(0), E(0), I(0), R(0), S q(0), E q(0), I q(0) are non-negative.
T45 2615-2619 Sentence denotes Data
T46 2620-2976 Sentence denotes In this study, the COVID-19 cases of Guangdong province, Hubei province and mainland China are obtained from the Health Commission of Guangdong Province (http://wsjkw.gd.gov.cn/), the Health Commission of Hubei Province (http://wjw.hubei.gov.cn/), and the National Health Commission of the People's Republic of China (http://www.nhc.gov.cn/), respectively.
T47 2977-3196 Sentence denotes The data are from Jan 20, 2020 to present which include the number of the cumulative confirmed cases, the number of the confirmed cases, the number of the cumulative cured cases and the number of cumulative death cases.
T48 3197-3388 Sentence denotes The numbers of the total population of Guangdong Province, Hubei Province and mainland China are employed at the end of 2018 from the National Bureau of Statistics (http://www.stats.gov.cn/).
T49 3389-3576 Sentence denotes The numbers of the input and output population from Hubei province and the other provinces of mainland China to Guangdong province are from the Baidu migration (http://qianxi.baidu.com/).
T50 3577-3752 Sentence denotes These data are covering the period of Jan 1, 2020 to Feb 20, 2020 which are employed to display the population migration variations from other provinces to Guangdong province.
T51 3753-4035 Sentence denotes Because the input population from Hubei province to Guangdong province is significantly decreased from 26.86% of the total input population at Jan 26, 2020 to the 6.84% at Jan 27, 2020, for the Guangdong province, the starting date of the COVID-19 disease data is from Jan 27, 2020.
T52 4037-4048 Sentence denotes Methodology
T53 4049-4156 Sentence denotes In this study, for the COVID-19 variations, we focus on the cumulative confirmed cases and confirmed cases.
T54 4157-4283 Sentence denotes The largest value of the cumulative confirmed cases means the total number of the population infected by the COVID-19 disease.
T55 4284-4389 Sentence denotes The disease extinction time is defined as the day with no confirmed case which is the time of I q(t) = 0.
T56 4390-4499 Sentence denotes The initial values and parameters can be obtained from the Text methodology of the supplementary information.
T57 4500-4833 Sentence denotes The baseline parameters noted as (A, B, p 1, p 2, p 3, q 1, q 2, q 3, α, β, ν, σ, γ) = (A* , B  * , p 1  * , p 2  * , p 3  * , q 1  * , q 2  * , q 3  *, α* , β  * , ν  *, σ  * , γ  *) is obtained from the simulation result of the cumulative confirmed cases, the daily new confirmed cases, the confirmed cases and the recovered cases.
T58 4834-5229 Sentence denotes To compare with the baseline results, three aspects from the perspectives of the input population and quarantine strategies on the COVID-19 variations are analyzed: (1) aspect 1, effects of the input population at different scenarios; (2) aspect 2, effects of quarantine rates at different scenarios and (3) aspect 3, effects of both input population and quarantine rates at different scenarios.
T59 5230-5589 Sentence denotes To evaluate the accuracy of our model, five statistical indices are applied, including the absolute error (AE), relative error (RE), mean absolute percentage error (MAPE), determinant coefficient R  *  2 which is the square of correlation coefficient R* and distance between indices of simulation and observation (DISO) ([Hu et al., 2016], [Hu et al., 2019]).
T60 5590-5669 Sentence denotes The details are displayed in Text methodology of the supplementary information.