چکیده:
Solve complex social and humanitarian issues has long been dream of scientists and
researchers . and the most important tool for there issues is simulation . we tried combine
several different simulation methods for population transfer function . note that the transfer
function in the field of humanities is considered as low . hence another reason for us to offer
combine different simulation methods . in first step , we provide a population model based
on the stock-flow diagram ( system dynamic ) and then , transfer this model to block
diagram model in matlab . finally , we calculation transfer function and compared the step
response of three methods . we hope that the hybrid approach , be considers in the field of
humanities .
خلاصه ماشینی:
the three methods are : stock-flow diagram ( humanities sciences , engineering sciences ) , block diagram model (engineering sciences , humanities sciences ) , transfer function (engineering sciences ) [1] system dynamic : is an approach to understanding the nonlinear behavior of complex systems over time using stocks , flows , internal feedback loops and time delay also is a methodology and mathematical modeling technique to frame , understand , and discuss complex issues and problem sd is currently being used throughout the public and private sector for policy analysis and design [2] block diagram model : a diagram showing in schematic form the general arrangement of parts or components of a complex system or process , such as an industrial apparatus , also is a diagram of system in witch the principal or functions are represented by blocks connected by lines that show the relationship of the blocks .
[12] 1- Methods : In first step , we present the population model based on the stock-flow diagram , in figure (1) population is output , birth and death is flow ( percent of population ) , migration is input ( step function , the range of 1 and the start time of 0 ) , birth rate is 0.
2016 ABSTRACT This study focused on identifying any possible relationship between symmetrical (S) and asymmetrical (AS) scaffolding and writing ability of Iranian students of English as a Foreign Language (EFL).