Framework Dynamics 1 .


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Framework Progress 1. CAP4800/5805 Frameworks Recreation. What is Framework Flow. PC reenactment demonstrating for contemplating and overseeing complex input frameworks, for example, business and other social frameworks Framework:
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Framework Dynamics 1 CAP4800/5805 Systems Simulation

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What is System Dynamics Computer recreation demonstrating for examining and overseeing complex input frameworks, for example, business and other social frameworks System: by and large, a gathering of collaborating components that capacity together for some reason Here, criticism is the separating descriptor Properties of element issues Contain amounts that differ after some time Variability can be depicted causally Important causal impacts can be contained inside a shut arrangement of input circles

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History Cybernetics (Wiener, 1948): the investigation of how natural, designing, social, and financial frameworks are controlled and directed Industrial Dynamics (Forrester, 1961): connected standards of artificial intelligence to modern frameworks System Dynamics: Forrester\'s work has been expanded to incorporate other social and monetary frameworks Relying on PC, System Dynamics gives a structure in which to apply the possibility of frameworks hypothesis to social and financial issues

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System Dynamics Modeling Identify an issue Develop a dynamic speculation clarifying the reason for the issue Create a fundamental structure of a causal chart Augment the causal diagram with more data Convert the increased causal diagram to a System Dynamics stream diagram Translate a System Dynamics stream diagram into DYNAMO projects or conditions

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Critical Aspects Thinking as far as circumstances and end results connections Focusing on the input linkages among segments of a framework Determining the suitable limits for characterizing what is to be incorporated inside a framework

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Understand Cause & Effect Causal deduction is the way to sorting out thoughts in a framework flow contemplate Instead of \'cause\', "influence" or "impact" can be utilized to portray the related parts in the framework Some are consistent (e.g. material science) Food admission  weight Money  bliss Fire  smoke Some are not (e.g. human science, financial matters) Use of safety belts  diminished thruway fatalities Shortened light hours  expanded suicide rates

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Feedback Thinking as far as "circumstances and end results" is insufficient sea  dissipation  cloud  rain  sea  … Feedback: an underlying cause swells through a tie of causation at last to re-influence itself Search to recognize shut, causal input circles is one key component of System Dynamics The most vital causal impacts will be precisely those that are encased inside criticism circle

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Causal Loop Diagram (CLD) Represent the input structure of frameworks Capture The speculations about the reasons for elements The imperative criticisms

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CLD Examples Salary VS Performance Salary  Performance  Salary Tired VS Sleep Tired  rest Sleep  tired

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Augmenting CLD 1 (Labeling Link Polarity) Signing: Add a "+" or a "–" sign at every pointed stone to pass on more data A "+" is utilized if the cause increment, the impact increments and if the cause diminish, the impact diminishes A \'- " is utilized if the cause builds, the impact diminishes and if the cause diminishes, the impact increments

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Signing Arcs + -

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+ - Augmenting CLD 2 (Determining Loop Polarity) Positive input circles Have a significantly number of "–" signs Some amount increment, a "snowball" impact assumes control and that amount keeps on expanding The "snowball" impact can likewise work backward Generate practices of development, increase, deviation, and strengthen Notation: put image in the focal point of the circle Negative input circles Have an odd number of "–" signs Tend to deliver "stable", "adjust", "harmony" and "objective chasing" conduct after some time Notation: put image in the focal point of the circle

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+ CLD with Positive Feedback Loop Salary  Performance, Performance  Salary The more compensation I improve I perform + The better I play out The more pay I get The more pay I show signs of improvement I perform +

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- CLD with Negative Feedback Loop Tired  Sleep, Sleep  Tired The more I sleep The less drained I am The less drained I am The less I rest The more drained I am The more I rest The less I sleep The more drained I am + -

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Loop Dominance There are frameworks which have more than one input circle inside them A specific circle in an arrangement of more than one circle is most in charge of the general conduct of that framework The commanding circle may move after some time When an input circle is inside another, one circle must rule Stable conditions will exist when negative circles overwhelm positive circles

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+ - CLD with Combined Feedback Loops (Population Growth) + -

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- + - CLD with Nested Feedback Loops (Self-Regulating Biosphere) Evaporation  mists  rain  measure of water  vanishing  … + - + - +

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- Exogenous Items that influence different things in the framework yet are not themselves influenced by anything in the framework Arrows are drawn from these things yet there are no bolts attracted to these things + - +

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- Delays Systems frequently react lazily From the case beneath, once the trees are planted, the collect rate can be "0" until the trees develop enough to reap delay

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Next Class Create an essential causal chart Augment the causal chart with more data Convert the enlarged causal chart to a System Dynamics stream chart Translate a System Dynamics stream chart into DYNAMO projects or conditions

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References Simulation Model Design and Execution, Fishwick, Prentice-Hall, 1995 (Textbook) Introduction to Computer Simulation: A framework flow displaying approach, Nancy Roberts et al, Addison-wesley, 1983 Business Dynamics: Systems thinking and demonstrating for an intricate world, John D. Sterman, McGraw-Hill,2000

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