Simulation

Simulation

1. Dymamics

   • use to learn causes of problems
   • Function
     • Maps a problem onto a generic structure
     • Describe human systems in terms of feedback
       • Negative feedback
         • Eliminate difference between input y output
       • Positive feedback
         • Add the variance
     • Understand
       • Why things happen?
     • Identify
       • Structure behind behaviour
   • Model systems which vary continually with time
     • Influence diagram
   • System
     • Stock
       • Accumulation of a resource
     • flow
       • The movement of this resource
   • Level of implementation
     • Managerial /stragegic
   • Timescale of analysis
     • months -years
   • individual elements aggregated into flows
   • Soft OR
   • Focus of analysis: Human-based systems

2. Discrete-event

   • Function
     • Use to replicate the structure
       • Modelling of a system that can be represented by a series of events
         • Number of entities
         • Number of attributes
         • by collecting data
           • process flows
           • Process times
           • Demand patterns
         • MODEL RESULTANT
           • Useful prediction of real systems
         • process map
     • Measure performance
       • Generating reports by using a software
         • Combined with the ability to interact
           • Visual Ibnteractive Simulation
         • Creating a model
           • Visual Interactive Modelling
   • Hard OR
   • Focus of analysis: Production-based system