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Lynn S. Fichter Dept Geology/Environmental Science James Madison University 1410h AN: ED23C-03.

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Presentation on theme: "Lynn S. Fichter Dept Geology/Environmental Science James Madison University 1410h AN: ED23C-03."— Presentation transcript:

1 Lynn S. Fichter Dept Geology/Environmental Science James Madison University 1410h AN: ED23C-03

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3 1. Complex systems are not just simple systems with a lot more parts. Premises 2. Complex systems have their own properties, behaviors, and terminology. 3. Our students enter our classes with virtually no familiarity with these ideas. Therefore, we must build these concepts for our students from the bottom-up – just like for any other new subject.

4 Bifurcation Self-similarity Fractal Agents Self-organized criticality Avalanches Power Laws Strange attractors Emergence The Language of Complexity

5 We can introduce the basic concepts in one-hour classes... Teaching Timing ?... I use them in at least 5 different classes,... and, can pull out and develop specific concepts for specific purposes depending on the depth we want, All the programs and supporting materials are available on line.

6 jmu.edu/geology/ComplexEvolutionarySystems/

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9 Learning Outcomes for understanding chaos theory.

10 Studies why and how the behavior of simple systems— simple algorithms—becomes more complex and unpredictable as the energy/information the system dissipates increases. X next = rX (1-X) System evolves to equilibrium The logistic system

11 A random sampling of logistic curves pulled from Google\images\logistic curve

12 Studies why and how the behavior of simple systems— simple algorithms—becomes more complex and unpredictable as the energy/information the system dissipates increases. X next = rX (1-X) System evolves to equilibriumSystem evolves to complexity The logistic system But, if we push the system harder Its behavior evolves into this.

13 X next = rX (1-X) X =.02 and r = 2.7 X next = rX (1-X) X next = (2.7) (.02) (1-.02 =.98) X next =.0529 Iteration X Value X =.02 and r = 2.7 X next = rX (1-X) X next = (2.7) (.02) (1-.02 =.98) X next = Equilibrium state All these systems can be modeled in a computer, in class, in real time.

14 20 generations But, what about these irregularities? Are they just meaningless noise, or do they mean something?

15 r = 2.7

16 r = 2.9

17 r = 3.0

18 r = 3.1

19 r = 3.5

20 r = 3.7

21 r = 4.0

22 r = 4.1

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24 r = 2.7 r = 2.9 X =.629 X =.655 r Value Population Size = X This axis was a time series, but becomes... Converting a Time Series Diagram into a Bifurcation Diagram

25 r = 3.3 r = 3.5 X =.48 &.82 X =.50,.87,.38,.82 split

26 r = Bifurcation diagram showing behavior of system at all values of r

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28 Great Stability at 1 value Increasing Instability Vibrating so hard It flies apart Return to stability, but with 2 stable points L.P Change is always accompanied by increasing instability

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30 Properties of Complex Evolutionary Systems Sensitive Dependence on Initial Conditions: X next r = r = Universality These two runs differ by a millionth of an ‘r’

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32   Is imbedded within...

33  ... studies how systems with many “agents” that are already at high energy/information dissipation interact and behave. Agent: the individual units that are interacting, like...

34 Agents

35 Agents = units of friction along a fault zone

36 Agents = sand grains in a migrating ripple

37   Complex systems theory studies how systems with many “agents” that are already at high energy/information dissipation interact and behave. How does complex system theory say the agents behave? The central dogma is complex systems are Self- Organizing Self-Organized Criticality Cellular Automata Boids Oscillating Reactions

38 Cellular Automata and Self Organization Survival Rules – 2/3 a live cell survives to the next generation if at least 2 but no more than three of the surrounding 8 cells are alive. Less than 2 and it dies of loneliness; more than 3 and it dies of over crowding.- Birth Rules – 3/3 a dead cells comes alive the next generation if 3, any 3, of the surrounding 8 cells are also alive. Local Rules/Global Behavior ?

39 Cellular Automata and Self Organization Survival Rules – 2/3 a live cell survives to the next generation if at least 2 but no more than three of the surrounding 8 cells are alive. Less than 2 and it dies of loneliness; more than 3 and it dies of over crowding.- Birth Rules – 3/3 a dead cells comes alive the next generation if 3, any 3, of the surrounding 8 cells are also alive. Local Rules/Global Behavior ?

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41 jmu.edu/geology/ComplexEvolutionarySystems/


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