Author

# Uttam Ghosh

Bio: Uttam Ghosh is an academic researcher from University of Calcutta. The author has contributed to research in topics: Fractional calculus & Differential equation. The author has an hindex of 12, co-authored 77 publications receiving 370 citations.

##### Papers

More filters

••

TL;DR: A deterministic compartmental model is formulated to study the spreading of COVID-19 and the model parameters are estimated by fitting the model with reported data of ongoing pandemic in India.

Abstract: The present novel coronavirus (SARS-CoV-2) infection has created a global emergency situation by spreading all over the world in a large scale within very short time period. But there is no vaccine, anti-viral medicine for such infection. So at this moment, a major worldwide problem is that how we can control this pandemic. On the other hand, India is high population density country, where the coronavirus infection disease (COVID-19) has started from 1 March 2020. Due to high population density, human to human social contact rate is very high in India. So controlling pandemic COVID-19 in early stage is very urgent and challenging problem of India. Mathematical models are employed to study the disease dynamics, identify the influential parameters and access the proper prevention strategies for reduction outbreak size. In this work, we have formulated a deterministic compartmental model to study the spreading of COVID-19 and estimated the model parameters by fitting the model with reported data of ongoing pandemic in India. Sensitivity analysis has been done to identify the influential model parameters. The basic reproduction number has been estimated from actual data and the effective basic reproduction number has been studied on the basis of reported cases. Some effective preventive measures and their impact have also been studied. Prediction are given on the future trends of the virus transmission under some control measures. Finally, the positive measures to control the disease have been summarized in the conclusion section.

54 citations

••

31 May 2020TL;DR: In this paper, a deterministic compartmental model is proposed to study the spreading of COVID-19 and estimated the model parameters by fitting the model with reported data of ongoing pandemic in India.

Abstract: The present novel coronavirus (SARS-CoV-2) infection has created a global emergency situation by spreading all over the world in a large scale within very short time period. But there is no vaccine, anti-viral medicine for such infection. So at this moment, a major worldwide problem is that how we can control this pandemic. On the other hand, India is high population density country, where the coronavirus infection disease (COVID-19) has started from 1 March 2020. Due to high population density, human to human social contact rate is very high in India. So controlling pandemic COVID-19 in early stage is very urgent and challenging problem of India. Mathematical models are employed to study the disease dynamics, identify the influential parameters and access the proper prevention strategies for reduction outbreak size. In this work, we have formulated a deterministic compartmental model to study the spreading of COVID-19 and estimated the model parameters by fitting the model with reported data of ongoing pandemic in India. Sensitivity analysis has been done to identify the influential model parameters. The basic reproduction number has been estimated from actual data and the effective basic reproduction number has been studied on the basis of reported cases. Some effective preventive measures and their impact have also been studied. Prediction are given on the future trends of the virus transmission under some control measures. Finally, the positive measures to control the disease have been summarized in the conclusion section.

34 citations

••

TL;DR: Using the normalised forward sensitivity index method, it is established that the model parameter mosquito biting rate, recruitment rate of mosquito, transmission probability per biting of Susceptible (infected) humans with infected (susceptible) mosquito, rate of awareness in host population, recovery rates of infected human are most sensitive parameters of the considered Zika model.

Abstract: In this paper, we have developed and analyzed a deterministic Zika model considering both vector and sexual transmission route with the effect of human awareness and vector control in the absence of disease induce death. To formulate the model, we assume that the Zika virus is being first transmitted to human by mosquito bite, and then it is being transmitted to his or her sexual partner. The system contains at most three equilibrium points among them one is the disease free and other two are endemic equilibrium points, exists under certain conditions. The theoretical analysis shows that the diseases-free equilibrium is locally and globally asymptotically stable if the basic reproduction number is less than one. Theatrically we have established that endemic equilibrium point which is locally asymptotically stable if the basic reproduction number is greater than one. The system exhibits backward bifurcation when the transmission probability per biting of susceptible mosquito with infected humans crosses the critical value. We estimate the model parameters and validate the model by fitting the model with the reported Zika infected human data from 1 to 36 week of 2016 Zika outbreak in Colombia. Furthermore, using the normalised forward sensitivity index method we have established that the model parameter mosquito biting rate, recruitment rate of mosquito, transmission probability per biting of Susceptible (infected) humans with infected (susceptible) mosquito, rate of awareness in host population, recovery rates of infected human are most sensitive parameters of the considered Zika model. Lastly, some conclusions are given to control the spreading of the Zika disease.

31 citations

••

TL;DR: In this article, two control functions have been used, one for vaccinating the susceptible population and other for the treatment control of infected population, and the Pontryagin's maximum principle has been used to characterize the optimal control whose numerical results show the positive impact of two controls mentioned above for controlling the disease.

Abstract: This paper deals with an SIR model with saturated incidence rate affected by inhibitory effect and saturated treatment function. Two control functions have been used, one for vaccinating the susceptible population and other for the treatment control of infected population. We have analysed the existence and stability of equilibrium points and investigated the transcritical and backward bifurcation. The Pontryagin’s maximum principle has been used to characterize the optimal control whose numerical results show the positive impact of two controls mentioned above for controlling the disease. Efficiency analysis is also done to determine the best control strategy among vaccination and treatment.

22 citations

••

TL;DR: In this article, a bound state solution of the Schrodinger equation for generalised Mie-type potential was obtained for a typical diatomic molecule, which is expressed via Mittag-Leffler function and fractionally defined confluent hypergeometric function.

Abstract: In this paper we obtain approximate bound state solutions of $N$-dimensional fractional time independent Schrodinger equation for generalised Mie-type potential, namely $V(r^{\alpha})=\frac{A}{r^{2\alpha}}+\frac{B}{r^{\alpha}}+C$. Here $\alpha(0<\alpha<1)$ acts like a fractional parameter for the space variable $r$. When $\alpha=1$ the potential converts into the original form of Mie-type of potential that is generally studied in molecular and chemical physics. The entire study is composed with Jumarie type fractional derivative approach. The solution is expressed via Mittag-Leffler function and fractionally defined confluent hypergeometric function. To ensure the validity of the present work, obtained results are verified with the previous works for different potential parameter configurations, specially for $\alpha=1$. At the end, few numerical calculations for energy eigenvalue and bound states eigenfunctions are furnished for a typical diatomic molecule.

22 citations

##### Cited by

More filters

••

01 Jan 20153,828 citations

••

2,084 citations

•

01 Jan 1991TL;DR: In this paper, the Third Edition of the Third edition of Linear Systems: Local Theory and Nonlinear Systems: Global Theory (LTLT) is presented, along with an extended version of the second edition.

Abstract: Series Preface * Preface to the Third Edition * 1 Linear Systems * 2 Nonlinear Systems: Local Theory * 3 Nonlinear Systems: Global Theory * 4 Nonlinear Systems: Bifurcation Theory * References * Index

1,977 citations

••

[...]

TL;DR: A model represents a synthesis of knowledge and data and can consequently provide results particularly about system properties, and is a very useful tool in the effort to achieve the best possible such view.

Abstract: A model can be considered as a synthesis of elements of knowledge about a system. The quality of the model is therefore very dependent on the quality of our knowledge about the elements and the available data. If our knowledge and data of a given problem are poor, it must not be expected that the model of the system will be able to fill the holes in our detailed knowledge or repair a poor set of data. On the other hand, models are able to provide new knowledge about the reactions and properties of an entire system. A model represents a synthesis of knowledge and data and can consequently provide results particularly about system properties. Furthermore, when we put together the results of many different models covering different viewpoints, we obtain a more comprehensive overall picture of the ecosystem, because we can, as discussed in Chapters 1 and 2, only cover our observations completely by the use of a pluralistic view. Modelling is a very useful tool in our effort to achieve the best possible such view.

421 citations

•

TL;DR: The first € price and the £ and $ price are net prices, subject to local VAT as mentioned in this paper, and the first £ and £ price is net price subject to the local VAT.

Abstract: The first € price and the £ and $ price are net prices, subject to local VAT. Prices indicated with * include VAT for books; the €(D) includes 7% for Germany, the €(A) includes 10% for Austria. Prices indicated with ** include VAT for electronic products; 19% for Germany, 20% for Austria. All prices exclusive of carriage charges. Prices and other details are subject to change without notice. All errors and omissions excepted. A.C. Michalos (Ed.) Encyclopedia of Quality of Life and Well-Being Research

275 citations