Diagram and simulation of disease spread

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Here is a sample of public Insights made by Insight Maker users. This list is auto-generated and updated daily.

A Tragedy of the Commons situation exists whenever two or more activities, each, which in order to produce results, rely on a shared limited resource. Results for these activities continue to develop as long as their use of the limited resource doesn't exceed the resource limit. Once this limit is reached the results produced by each activity are limited to the level at which the resource is replenished. See also Archetypes.

Video

This model is part of

And? Understanding Relationships & Their Implications.

Tragedy of the Commons

Gene Bellinger

24 3 days ago

Generated by Insight Maker:

A graphical representation of a predator-prey relationship:

lynx = predator

snowshoe hare = prey

Note: The actual numbers may not be entirely accurate, but the graph should qualitatively depict the dynamics between these predators & their prey.

Background: The snowshoe hare is the lynx's main food source, so the two species are tightly interdependent. When the hare is scarce, the lynx feeds on mice, voles, squirrels, and carrion, but these prey do not sufficiently meet its needs, so it is more vulnerable to starvation & predation. Thus, when hares decrease the lynx population also decreases. After a time lag, the hare population rebounds because of less lynx predation. The lynx population, in turn, rebounds. This repeated cycle shows a pattern found in many predator-prey relationships.

22-Jan_Lynx-Hare

Peter Murphy

34 3 weeks ago

A Casual Loop Diagram Indicating plausible relationships between Key variables relative to the illegal Immigration in the United States.

Casual Loop Diagram - Illegal Immigration - Richard Estefan

Richard A. Estefan

3 days ago

When deferred requirements pile up and underestimated complexity surround a project, managers end up riding a bow wave of schedule and delivery complications. From William E. Novak and Linda Levine CMU SEI Sept 2010 Success in Acquisition: Using Archetypes to Beat the Odds paper and see webpage

Bow wave effect

Geoff McDonnell

4 months ago

STEM-SM combines a simple ecosystem model (modified version of VSEM; Hartig et al. 2019) with a soil moisture model (Guswa et al. (2002) leaky bucket model). Outputs from the soil moisture model influence ecosystem dynamics in three ways.

(1) The ratio of actual transpiration to maximum evapotranspiration (T/ETmax) modifies gross primary productivity (GPP).

(2) Degree of saturation of the soil (Sd) modifies the rate of soil heterotrophic respiration.

(3) Water limitation of GPP (by T/ETmax) and of soil nutrient availability (approximated by Sd) combine with leaf area limitation (approximated by fraction of incident photosynthetically-active radiation that is absorbed) to modify the allocation of net primary productivity to aboveground and belowground parts of the vegetation.

Ecosystem dynamics in turn influence flows of water in to and out of the soil moisture stock. The size of the aboveground biomass stock determines fractional vegetation cover, which modifies interception, soil evaporation and transpiration by plants.

References:

Guswa, A.J., Celia, M.A., Rodriguez-Iturbe, I. (2002) Models of soil moisture dynamics in ecohydrology: a comparative study. Water Resources Research 38, 5-1 - 5-15.

Hartig, F., Minunno, F., and Paul, S. (2019). BayesianTools: General-Purpose MCMC and SMC Samplers and Tools for Bayesian Statistics. R package version 0.1.7. https://CRAN.R-project.org/package=BayesianTools

Simple Terrestrial Ecosystem Model - Soil Moisture (STEM-SM)

Lisa Belyea

181 3 months ago

A visual look at using technology in school based on the article:

Levin, B. B., & Schrum, L. (2013). Using systems thinking to leverage technology for school improvement: Lessons learned from award-winning secondary Schools/Districts. Journal of Research on Technology in Education, 46(1), 29-51.

Using Systems thinking for technology in education

Rob koch