How to find Johnson Cook Parameters by using Stress-Strain Graph explained through Excel Sheets?

I have shown the calculation regarding the Johnson-Cook (JC) material model. And also explained through Excel sheet, If you are having the stress-strain data. I refer to the following paper: “Johnson Cook Material and Failure Model Parameters Estimation of AISI-1045 Medium Carbon Steel for Metal Forming Applications.“ What is JC parameters and why we need these parameters explained in following YouTube link: