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Local Well-Posedness for a Generalized Integrable Shallow Water Equation with Strong Dispersive Term 一类具有强色散项的广义可积浅水方程的局部适定性
Q2 Mathematics Pub Date : 2021-07-01 DOI: 10.18576/amis/150404
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引用次数: 0
Estimating Parameters of a SEIRD Model Applied to SARS-CoV-2 Infections in Germany based on the Particle Swarm Optimization Method 基于粒子群优化方法的德国SARS-CoV-2感染SEIRD模型参数估计
Q2 Mathematics Pub Date : 2021-07-01 DOI: 10.18576/amis/150403
E. A. Nakajima, A. Ignacio, D. Lange, E. Izumi
The present paper describes a particle swarm optimization (PSO) method used to estimate parameters of a Susceptible-Exposed-Infected-Recovered-Dead (SEIRD) model applied to predict SARS-CoV-2 transmission in Germany, based on data from February 15th to April 25th, 2020, considering that the lockdown in the country started on March 23rd. The model estimated patients' mortality (4.92%) and recovery rates (95.08%), virus incubation (8.54 days), infection periods (18.65 days), as well as the basic virus reproduction number before (R0 = 11.60) and after (R0 = 0.39) lockdown. The predicted values were accurate until the 70th day. The performances achieved by the model were 0.98 for infected, 0.97 for the recovered and 0.97 for the dead, asserting the model's great performance (>0.75). The model also suggests that on February 15th, 2020, there were 67 infected individuals in the incubation period. We believe that this model can help other studies to better understand and accurately predict epidemic curves, mainly in countries where the new coronavirus has recently started to spread. It also may guide public health policies that aim to control the disease. © 2021 NSP Natural Sciences Publishing Cor. All Rights Reserved.
本文描述了一种粒子群优化(PSO)方法,用于估计用于预测德国SARS-CoV-2传播的易感-暴露-感染-恢复-死亡(SEIRD)模型的参数,该模型基于2020年2月15日至4月25日的数据,考虑到德国的封锁始于3月23日。该模型估计了封锁前(R0 = 11.60)和封锁后(R0 = 0.39)患者的死亡率(4.92%)和康复率(95.08%)、病毒潜伏期(8.54天)、感染期(18.65天)以及基本病毒繁殖数。在第70天之前,预测值是准确的。模型对感染、恢复和死亡的性能分别为0.98、0.97和0.97,表明该模型具有良好的性能(>0.75)。该模型还显示,2020年2月15日,有67名感染者处于潜伏期。我们相信这个模型可以帮助其他研究更好地理解和准确预测流行曲线,主要是在新冠病毒最近开始传播的国家。它还可以指导旨在控制这种疾病的公共卫生政策。©2021 NSP自然科学出版社版权所有
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引用次数: 1
General Power Inequalities for Generalized Euclidean Operator Radius 广义欧几里德算子半径的一般幂不等式
Q2 Mathematics Pub Date : 2021-07-01 DOI: 10.18576/amis/150412
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引用次数: 0
On Solutions of Fully Fuzzy Linear Fractional Programming Problems Using Close Interval Approximation for Normalized Heptagonal Fuzzy Numbers 正则化七方模糊数的全模糊线性分式规划问题的闭区间逼近解
Q2 Mathematics Pub Date : 2021-07-01 DOI: 10.18576/amis/150409
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引用次数: 2
Interpolation of Surfaces with Asymptotic Curves in Euclidean 3-Space 欧氏3-空间中具有渐近曲线的曲面的插值
Q2 Mathematics Pub Date : 2021-02-23 DOI: 10.18576/amis/150416
Mustafa Altın, .Inan Unal, F. Mofarreh
In this paper, we investigate the interpolation of surfaces which are obtained from an isoasymptotic curve in 3D-Euclidean space. We prove that there exist a unique C 0 -Hermite surface interpolation related to an isoasymptotic curve under some special conditions on the marching scale functions. Finally, we present some examples and plot their graphs.
本文研究了在三维欧氏空间中由等渐近曲线得到的曲面的插值问题。我们证明了在行进尺度函数的某些特殊条件下,存在一个与等渐近曲线相关的唯一的C0-Hermite曲面插值。最后,我们给出了一些例子并绘制了它们的图形。
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引用次数: 0
Generalized Schwarz Algorithm For A Class Of Variational Inequalities 一类变分不等式的广义Schwarz算法
Q2 Mathematics Pub Date : 2021-01-01 DOI: 10.18576/amis/150102
Bouzoualegh Ikram, Saadi Samira
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引用次数: 0
Distinguishing Graphs Associated to KU-Algebras using Graph Invariants 用图不变量区分与ku -代数相关的图
Q2 Mathematics Pub Date : 2021-01-01 DOI: 10.18576/amis/150103
D. Al-Kadi
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引用次数: 0
Runge-Kutta Fehlberg Method for Solving Linear and Nonlinear Fuzzy Fredholm Integro-Differential Equations 求解线性和非线性模糊Fredholm积分微分方程的Runge-Kutta Fehlberg方法
Q2 Mathematics Pub Date : 2021-01-01 DOI: 10.18576/AMIS/150106
P. Hammachukiattikul, B. Unyong, R. Suresh, G. Rajchakit, R. Vadivel, N. Gunasekaran
A study on the parametric form of fuzzy numbers is presented in this paper. The Runge-Kutta Fehlberg method is exploited to yield the approximate solution with respect to the second type of fuzzy Fredholm integro-differential equations. Both linear and nonlinear numerical examples are provided in our analysis. The results ascertain the effectiveness and precision of the proposed method.
本文研究了模糊数的参数形式。利用Runge-Kutta Fehlberg方法得到了第二类模糊Fredholm积分微分方程的近似解。在我们的分析中提供了线性和非线性的数值例子。实验结果验证了该方法的有效性和精度。
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引用次数: 2
On the Stability Analysis and Solutions of Fractional Order Pine Wilt Disease Model 部分阶松枯萎病模型的稳定性分析与求解
Q2 Mathematics Pub Date : 2020-11-01 DOI: 10.18576/amis/140620
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引用次数: 1
New Accurate Approximation for the Sum of Generalized Gamma Distributions and its Applications 广义伽玛分布和的新精确逼近及其应用
Q2 Mathematics Pub Date : 2020-11-01 DOI: 10.18576/amis/140619
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引用次数: 0
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Applied Mathematics & Information Sciences
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