Italy and USA are severely affected by COVID-19. Since then, the infectious disease has become a public health threat. WHO published in its website preliminary guidelines with public health care for the countries to deal with the pandemic. Since then, it has become a pandemic declared by World Health Organization (WHO) on March 11, which has spread around the globe, ,. In December 2019, a novel strand of Coronavirus (SARS-CoV-2) was identified in Wuhan, Hubei Province, China causing a severe and potentially fatal respiratory syndrome, i.e., COVID-19. By comparing the recorded data with the data from our modelling approaches, we deduce that the spread of COVID-19 can be under control in all communities considered, if proper restrictions and strong policies are implemented to control the infection rates early from the spread of the disease. We propose predictions on various parameters related to the spread of COVID-19 and on the number of susceptible, infected and removed populations until September 2020. Our analysis takes into account data from January to June, 2020, the period that contains the data before and during the implementation of strict and control measures. Our work shows the importance of modelling the spread of COVID-19 by the SIR model that we propose here, as it can help to assess the impact of the disease by offering valuable predictions. The SIR model can provide us with insights and predictions of the spread of the virus in communities that the recorded data alone cannot. To the contrary, as we show herein, it can be increased in surge periods! In particular, we investigate the time evolution of different populations and monitor diverse significant parameters for the spread of the disease in various communities, represented by China, South Korea, India, Australia, USA, Italy and the state of Texas in the USA. Here, the model is based upon the well-known susceptible-infected-removed (SIR) model with the difference that a total population is not defined or kept constant per se and the number of susceptible individuals does not decline monotonically. Revenue can only be recognized once this is done.In this paper, we study the effectiveness of the modelling approach on the pandemic due to the spreading of the novel COVID-19 disease and develop a susceptible-infected-removed (SIR) model that provides a theoretical framework to investigate its spread within a community. This should only be done once the transaction is complete and your obligation is fulfilled. Recognize revenue when the performing party satisfies the performance obligation.This step involves any specific selling price to every single obligation. Allocate the determined amount of consideration/price to the contractual obligations.This isn't just about the price of goods and services but also includes other factors, such as discounts, return policies, and additional fees. Determine the amount of consideration/price for the transaction.In this case, it's important to outline the specific goods or services behind the agreement. Identify contractual performance obligations. Contracts may come in written form or may begin as verbal agreements. This involves agreeing on the terms of the contract, including payment, the delivery of goods and services, and consequences if any obligations aren't met. Identify the contract with the customer.
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