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Dynamic Modeling by Bruce Hannon, Matthias Ruth, D.H. Meadows

By Bruce Hannon, Matthias Ruth, D.H. Meadows

The publication makes use of STELLA software program to advance simulation versions, hence permitting readers to transform their knowing of a phenomenon to a working laptop or computer version, after which run it to yield the inevitable dynamic effects outfitted into the constitution. half I presents an creation to modeling dynamic structures, whereas half II deals normal modeling tools. components III via VIII then observe those how to version real-world phenomena from chemistry, genetics, ecology, economics, and engineering. A transparent, approachable advent to the modeling procedure, of curiosity in any box the place genuine difficulties might be illuminated by means of machine simulation.

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0;;=. 00 Time there is no replenishment process. If we are running the model long enough we will see the end of our people! But not before they rise to a great peak (less than 200 of course). Try changing the shape of the EAT PER HEAD graph to represent different scarcity control strategies. Suppose a very democratic regime was in control and whatever was left is shared equally. Suppose on the other hand that the community leaders are weak and let a few strong members hoard food while others starve.

00 ----_I_---____. 00 FOOD(t) = FOOD(t - dt) + (FOOD_PRODUCTION - EAT) * dt INIT FOOD = 1000 {Kilograms; reduce to eliminate the first peak of the population. 1 Population Cohort Model This chapter discusses how to handle two independent variables in a STELLA II model. Time is our usual independent variable and we use it to cause the change in our models. First we introduce several stock variables to indicate various temporal aspects of the state variable of the system. Such a disaggregation can be done, for example, for a population into different age classes.

The units of NET BIRTH RATE are l/number of individuals in the population/time period. " POPULA11O NET BIRTH RATE The NET BIRTH RATE in our model is not a fixed number but depends, in turn, on the population. As in the previous chapter, this dependence is specified, for simplicity, graphically. Altematively, anthropologists may have told us the statistical relationship between NET BIRTH RATE and POPULATION in functional form. We then could have expressed the influence of the population size on the magnitude of NET BIRTH RATE by this function instead of the graph.

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