检索结果-南通市图书馆

Improvement of the software for modeling the dynamics of epidemics and developing a user-friendly interface

Infectious Disease Modelling 2023年第3期8卷 806-821页

作者： igor nesteruk Institute of Hydromechanics National Academy of Sciences of UkraineKyivUkraine igor Sikorsky Kyiv Polytechnic Institute KyivUkraine

The challenges humanity is facing due to the Covid-19 pandemic require timely and accurate forecasting of the dynamics of various epidemics to minimize the negative consequences for public health and the *** can use a variety of well-known and new mathematical models,taking into account a huge number of ***,complex models contain a large number of unknown parameters,the values of which must be determined using a limited number of observations,e.g.,the daily datasets for the accumulated number of *** experience in modeling the COVID-19 pandemic has shown that it is possible to apply the simplest SIR model,which contains 4 unknown *** of the original algo-rithm of the model parameter identification for the first waves of the COVID-19 pandemic in China,South Korea,Austria,Italy,Germany,France,Spain has shown its high accuracy in pre-dicting their duration and number of *** simulate different epidemic waves and take into account the incompleteness of statistical data,the generalized SIR model and algorithms for determining the values of its parameters were *** interference of the previous waves,changes in testing levels,quarantine or social behavior require constant monitoring of the epidemic dynamics and performing SIR simulations as often as possible with the use of a user-friendly *** tool will allow predicting the dynamics of any epidemic using the data on the number of diseases over a limited period(e.g.,14 days).It will be possible to predict the daily number of new cases for the country as a whole or for its separate region,to estimate the number of carriers of the infection and the probability of facing such a carrier,as well as to estimate the number of *** of three SIR simulations of the COVID-19 epidemic wave in Japan in the summer of 2022 are presented and *** predicted accumulated and daily numbers of cases agree with the results of observations,especially f

关键词： COVID-19 pandemic Epidemic waves Epidemic dynamics in Japan Mathematical modeling of infection diseases SIR model Parameter identification Statistical methods

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Shapes of the fastest fish and optimal underwater and floating hulls

引用

Theoretical & Applied Mechanics Letters 2022年第6期12卷 403-408页

作者： igor nesteruk Institute of Hydromechanics National Academy of Sciences of UkraineNational Technical University of Ukraine“Igor Sikorsky Kyiv Polytechnic Institute”Ukraine

A streamlined shape of the best swimmers removes the boundary-layer separation and ensures a laminar flow *** fastest fish have a very sharp convex nose(rostrum),the purpose of which remains *** bodies of revolution similar to their shapes are analyzed in steady underwater and floating *** sources and sinks were located on the axis of symmetry and above the water surface to estimate the pressure on the body and the vertical velocities on the water *** was shown that the flow patterns on a special shaped body with concave nose has no stagnation points and ensure small values of the water surface *** fact allow diminishing the maximum pressure on the surface and wave *** shapes with the sharp concave nose and negative pressure gradients on their surface could be parts of the low drag underwater and floating hulls.

关键词： Drag reduction Wave drag Ship hulls optimization Unseparated shapes Water locomotion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：