ABSTRACT
Based on the SEIR model, two compartments for self-protection and isolation are introduced, and a more general infectious disease transmission model is proposed.Through qualitative analysis of the model, the basic reproduction number of the model is calculated, and the local asymptotic stability of the disease-free equilibrium point and the endemic equilibrium point of the model is analyzed through eigenvalue theory and Routh-Hurwitz criterion.The numerical simulation and fitting results of COVID-19 virus show that the proposed SEIQRP model can effectively describe the dynamic transmission process of the infectious disease.In the model, the three parameters, i.e.protection rate, incubation period isolation rate, and infected person isolation rate play a very critical role in the spread of the disease.Raising people's awareness of self-protection, focusing on screening for patients in the incubation period, and isolating and treating infected people can effectively reduce the spread of infectious diseases. © 2023 Northeastern University.All rights reserved.
ABSTRACT
The process through which people and society begin to see and frame something as risky is complex. As risk communication practitioners play a critical role in fostering real-world risk governance, this study emphasizes the performative role of language in mobilizing symbolic resources to build and control risks from a communication standpoint. Critical discourse analysis (CDA) was used to reveal patterns of how two events - the COVID-19 pandemic and the Russia-Ukraine dispute - were covered by the Chinese media, and speculate about the relationship between risk communication practice and its wider geopolitical context. Results revealed different frames were used for the two events, and that 'threat' was most frequently used when addressing the Russia-Ukraine dispute, whereas 'risk' was adopted for most COVID-19-related articles. Two themes were generated when interpreting the discourse through a critical geopolitical approach: 'From the COVID-19 Approach to the Political Systems' and 'China as a global Player through its peaceful Rise'. While China prefers to maintain peace in its interaction with other global actors, the Chinese government does not simply accept adversity, particularly when it comes to geopolitical conflicts derived from arbitrary ideological disagreements. The study adds to the current literature on the relationship between the practice and context of risk communication, as well as to the underrepresented regional online news coverage of risks and conflicts that focus on China.
ABSTRACT
Countries across the world responded very differently in their prevention and control of coronavirus disease 2019 (COVID-19), and state capacity is likely driving these differences. In this study, we define state capacity in preventing and controlling COVID-19 as the extent to which a state takes rapid intervention measures based on scientific evidence to prevent and control infectious diseases. This case study explores China's experience in terms of pandemic prevention and control, showing that the goal of pandemic prevention and control in the country is a concrete combination of outcome goals and multidimensional process objectives. This research also demonstrates the important role of state capacity in pandemic prevention and control in China by analyzing different ways to quickly achieve accessibility and full coverage of intervention measures for the target population. Finally, we argue that a country's political system is not a decisive factor in pandemic prevention and control. Rather, the historical experience of a country in dealing with similar outbreaks and current state capacity play important roles.