Vensim

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VensimVensimVensimVensim(I)Vensim(II)

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(1)

(2)Vensim

(3)Vensim(4)VensimSyntheSim:

(5)

(6)Vensim , ,

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(7)Vensim Vensim(Game)

(8)(9) VensimVensim

(10)

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MITJay W. Forrester 1950~60SD1970~801990~

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()()

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SDSD

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S(p)()St

SSi

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LRALPW

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(System)

X=(x1,x2,..n) U=(u1, u2, ..,um) X=f(X,U,t)

: U, f(X,U,t)) X=f(X,U,t)

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Robust

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Vensim

VensimVensimVensimVensimVensim

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Vensim Vensim Ventana Systems, Inc. 1985 Harvard, MassachusettsVensim19881993Vensim 1.50Vensim 1.62 1995Vensim 3.01997Vensim 41999Vensim 4.14.22000Vensim 52002.Vensim 5.32004 Vensim 5.52005 Vensim 5.62006Vensim 5.7a2008

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Vensim Vensim Causal Tracing Subscripting Optimization Venapp Flight Simulators (Learning Environments) Resource Allocation algorithm (ALLOC P) Reality Check

Bob EberleinPh.D in MIT 2007

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Vensim Vensim PLE, , Vensim PLE PlusPLE Plus , Monte Carlo ,. Vensim ProfessionalPLE Plus , Vensim DSSDLLVensim Model ReaderVensimMoleculesVenapps

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VensimTitel Bar: Menu :Tools Bar Main ToolsSimulation ToolsAnalysis ToolsSketch Tools :Status Bar

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Vensim Main Tools Sketch ToolsLock:Move/Size:Variable:Box Variable:Arrow: Rate:Merge:Delete:,Model Variable:Shadow Variable:Input Output Object : Sketch Comment: Unhide Wand:Hide Wand:Equations:Reference Model:

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Vensim Simulation ToolsControl: Set up a simulation:Run Name: Choose Runname:Simulate:SyntheSim:Game:Sensitivity:Optimize:Reality Check: Build Windows:Output Windows:Control Panel:Subscrip:

Analysis Tools

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Vensim Analysis ToolsVenapp

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Vensim Vensim

PDFs Vensim User GuideVensim Modeling GuideVensim Reference ManualVensim DSS Reference Supplement

Vesim\models\guideVesim\models\mguideVesim\models\sample

Vensim www.vensim.com

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Vensim

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12 SWOT

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A+ BAB1AB2ABA- BAB1AB2AB

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12

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Level

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SyntheSimSyntheSim

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01FINAL TIME = 100Units: MonthThe final time for the simulation.07 = INTEG(, )Units: Person02INITIAL TIME = 0Units: MonthThe initial time for the simulation08 = 3Units: Month03SAVEPER = TIME STEPUnits: MonthThe frequency with which output is stored09 = INTEG(-,300)Units: Widget04TIME STEP = 1Units: MonthThe time step for the simulation10 = 3Units: Month05 =*Units: Widget/Month11 = ( - )/ Units: Widget/Month06 = 100 + STEP(50,20)Units: Widget/Month12 = 2Units: Month

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Vensim

SDVensimVensim

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SD Simple functions: If then else,

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Vensim

Common functions Simple functions Dynamic functions Reality Check functions Lookup functions

/ Discrete/Delay functions Data Only functions. Array. User Defined DLL. Macros :MACRO: definitions.All:

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VensimVensim:+, -,*, /: =,>,